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FUJITSU SEMICONDUCTOR DATA SHEET
DS04-27203-8E
ASSP
BIPOLAR
Switching Regulator Controller
MB3778
DESCRIPTION
The MB3778 is a dual switching regulator control IC. It has a two-channel basic circuit that controls PWM system switching regulator power. Complete synchronization is achieved by using the same oscillator output wave. This IC can accept any two of the following types of output voltage: step-down, step-up, or voltage inversion (inverting voltage can be output to only one circuit). The MB3778's low power consumption makes it ideal for use in portable equipment.
FEATURES
* * * * * * * * * Wide input voltage range : 3.6 V to 18 V Low current consumption : 1.7 mA Typ operation, 10 A Max stand-by Wide oscillation frequency range:1 kHz to 500 kHz Built-in timer latch short-circuit protection circuit Built-in under-voltage lockout circuit Built-in 2.46 V reference voltage circuit : 1.23 V output can be obtained from RT terminal Variable dead-time provides control over total range Built-in stand-by function: power on/off function Two types of packages (SOP-16pin :1 type, SSOP-16pin :1 type)
APPLICATIONS
* LCD monitor/panel * Surveillance camera etc.
Copyright(c)1994-2006 FUJITSU LIMITED All rights reserved
MB3778
PIN ASSIGNMENT
(TOP VIEW)
CT RT +IN1 -IN1 FB1 DTC1 OUT1 E/GND
1 2 3 4 5 6 7 8
16 15 14 13 12 11 10 9
VREF SCP CTL -IN2 FB2 DTC2 OUT2 VCC
(FPT-16P-M05) (FPT-16P-M06)
2
MB3778
PIN DESCRIPTION
No. 1 2 3 4 5 Pin CT RT +IN1 -IN1 FB1 Function Oscillator timing capacitor terminal (150 pF to 15,000 pF) . Oscillator timing resistor terminal (5.1 k to 100 k) . VREF x 1/2 voltage is also available at this pin for error amplifier reference input. Error amplifier 1 non-inverted input terminal. Error amplifier 1 inverted input terminal. Error amplifier 1 output terminal. A resistor and a capacitor are connected between this terminal and the -IN1 terminal to adjust gain and frequency. OUT1 dead-time control terminal. Dead-time control is adjusted by an external resistive divider connected to the VREF pin. A capacitor connected between this terminal and GND enables soft-start operation. Open collector output terminal. Output transistor has common ground independent of signal ground. This output can source or sink up to 50 mA. Power supply terminal (3.6 V to 18 V) Open collector output terminal. Output transistor has common ground independent of signal ground. This output can source or sink up to 50 mA. Sets the dead-time of OUT2. The use of this terminal is the same as that of DTC1. Error amplifier 2 output terminal. Sets the gain and adjusts the frequency when a resistor and a capacitor are connected between this terminal and the -IN2 terminal. Voltage of VREF x 1/2 voltage is internally connected to the non-inverted input of error amplifier 2. Uses error amplifier 2 for positive voltage output. Error amplifier 2 inverted input terminal. Power control terminal. The IC is set in the stand-by state when this terminal is set "Low." Current consumption is 10 A or lower in the stand-by state. The input can be driven by TTL or CMOS. The time constant setting capacitor connection terminal of the timer latch short-circuit protection circuit. Connects a capacitor between this pin and GND. For details, see " HOW TO SET TIME CONSTANT FOR TIMER LATCH SHORT-CIRCUIT PROTECTION CIRCUIT". 2.46 V reference voltage output terminal which can be obtained up to 1 mA. This pin is used to set the reference input and idle period of the error amplifiers.
6
DTC1
7 8 9 10
OUT1
E/GND Ground terminal. VCC OUT2
11
DTC2
12
FB2
13
-IN2 CTL
14
15
SCP
16
VREF
3
MB3778
BLOCK DIAGRAM
9 2.46 V 16 14 1.9 V 1.3 V
- + +
1
2 1.23 V
Reference Voltage 2.46 V
Power Supply Control
Triangular Oscillator
OUT1
7
3 4 5 12 13
Error Amp 1 + -
PWM Comp.1
- - +
S.C.P. Comp.
- + +
OUT2 PWM Comp.2
10
2.1 V Error Amp 2 - + 1.23 V 2.46 V 1 A
15 RS Latch R U. V. L. O. - - + 1.1 V 6 11
8
D.T.C. Comp.
4
MB3778
OPERATION DESCRIPTION
1. Reference voltage circuit
The reference voltage circuit generates a temperature-compensated reference voltage ( = 2.46 V) from VCC : terminal (pin 9) . The reference voltage is used as an operation power supply for internal circuit. The reference is obtained from the VREF terminal (pin 16).
2. Triangular wave oscillator
Triangular waveforms can be generated at any frequency by connecting a timing capacitor and resistor to the CT terminal (pin 1) and to the RT terminal (pin 2) . The amplitude of this waveform is from 1.3 V to 1.9 V. These waveforms are connected to the non-inverting inputs of the PWM comparator and can be output through the CT terminal (pin 1) .
3. Error amplifiers (Error Amp)
The error amplifier detects the output voltage of the switching regulator and outputs PWM control signals.The in-phase input voltage range is from 1.05 V to 1.45 V.The reference voltage obtained by dividing the reference voltage output (recommended value : VREF/2) or the RT terminal (pin 2) voltage (1.23 V) is supplied to the noninverting input. The VREF/2 voltage is internally connected to non-inverting input of the other error amplifier. Any loop gain can be chosen by connecting the feedback resistor and capacitor to the inverting input terminal from the output terminal of the error amplifier.Stable phase compensation is possible.
4. Timer latch short circuit protection circuit
This circuit detects the output levels of each error amplifier. If the output level of one or both of the error amplifiers is 2.1 V or higher, the timer circuit begins charging the externally connected protection enable-capacitor. If the output level of the error amplifier does not drop below the normal voltage range before the capacitor voltage reaches the transistor base-emitter voltage, VBE( = 0.65 V), the latch circuit turns the output drive transistor off : and sets the idle period to 100%.
5. Under voltage lock-out circuit
The transition state at power-on or a momentary drops in supply voltage may cause the control IC to malfunction, which may adversely affect or even destroy the system. The under voltage lockout circuit monitors VCC with reference to the internal reference voltage and resets the latch circuit to turn the output drive transistor off. The idle period is set to 100%. It also pulls the SCP terminal (pin 15) "Low".
6. PWM comparator unit
Each PWM comparator has one inverting input and two non-inverting inputs. This voltage-to-pulse-width converter controls the turning on time of the output pulse according to the input voltage. The PWM comparator turns the output drive transistor on while triangular waveforms from the oscillator are lower than the error amplifier output and the DTC terminal voltage.
7. Output drive transistor
The output drive transistors have open collector outputs with common source supply and common grounds independent of VCC and signal ground. The output drive transistors for switching can sink or source up to 50 mA.
8. Power control unit
The CTL terminal (pin 14) controls power on/off modes(the power supply current in stand-by mode is 10 A or lower).
5
MB3778
ABSOLUTE MAXIMUM RATINGS
Parameter Power Supply Voltage Error Amp Input Voltage Control Input Voltage Collector Output Voltage Collector Output Current Power Dissipation Operating Ambient Temperature Storage Temperature Symbol VCC VIN VCTL VOUT IOUT PD Ta Tstg Condition Ta +25 C (SOP) Ta +25 C (SSOP) Rating Min -0.3 -0.3 -30 -55 Max 20 +10 +20 20 75 620* 444* +85 +125
1 2
Unit V V V V mA mW mW C C
*1: The packages are mounted on the epoxy board (4 cm x 4 cm) *2: The packages are mounted on the epoxy board (10 cm x 10 cm) WARNING: Semiconductor devices can be permanently damaged by application of stress (voltage, current, temperature, etc.) in excess of absolute maximum ratings. Do not exceed these ratings.
RECOMMENDED OPERATING CONDITIONS
Parameter Power Supply Voltage Error Amp Input Voltage Control Input Voltage Collector Output Voltage Collector Output Current Timing Capacitor Timing Resistor Oscillator Frequency Operating Ambient Temperature Symbol VCC VIN VCTL VOUT IOUT CT RT fOSC Ta Value Min 3.6 1.05 0 0.3 150 5.1 1 -30 Typ 6.0 +25 Max 18 1.45 18 18 50 15000 100 500 +85 Unit V V V V mA pF k kHz C
WARNING: The recommended operating conditions are required in order to ensure the normal operation of the semiconductor device. All of the device's electrical characteristics are warranted when the device is operated within these ranges. Always use semiconductor devices within their recommended operating condition ranges. Operation outside these ranges may adversely affect reliability and could result in device failure. No warranty is made with respect to uses, operating conditions, or combinations not represented on the data sheet. Users considering application outside the listed conditions are advised to contact their FUJITSU representatives beforehand.
6
MB3778
ELECTRICAL CHARACTERISTICS
(Ta = +25 C, VCC = 6 V) Parameter Reference Block Output Voltage Output Temp. Stability Input Stability Load Stability Short Circuit Output Current VREF VRTC Line Load IOS VtH VtL VHYS VR VtPC VSTB VIN Ibpc VtC fOSC fdev fdV fdT Ibdt Idt Vdt Vdt = 2.5 V Idt = 100 A No pull up No pull up Pin 5, Pin 12 CT = 330 pF, RT = 15 k CT = 330 pF, RT = 15 k VCC = 3.6 V to 18 V Ta = -30 C to +85 C IOR = -1 mA Ta = -30 C to +85 C VCC = 3.6 V to 18 V IOR = -0.1 mA to -1 mA VREF = 2 V IOR = -0.1 mA IOR = -0.1 mA IOR = -0.1 mA 2.41 -2 -30 80 1.5 0.60 -1.4 160 -4 150 2.46 0.2 2 1 -10 2.72 2.60 120 1.9 0.65 50 50 -1.0 2.1 200 5 1 0.2 500 2.51 +2 10 7.5 -3 0.70 100 100 -0.6 240 +4 1 0.3 V % mV mV mA V V mV V V mV mV A V kHz % % % A A V (Continued) Symbol Condition Value Min Typ Max Unit
Under Voltage Lockout Protection Block Threshold Voltage Hysteresis Width Reset Voltage (VCC) Protection Circuit Block (S.C.P.) Input Threshold Voltage Input Stand by Voltage Input Latch Voltage Input Source Current Comparator Threshold Voltage Triangular Waveform Oscillator Block Oscillator Frequency Frequency Deviation Frequency Stability (VCC) Frequency Stability (Ta) Dead-Time Control Block (D.T.C.) Input Bias Current Latch Mode Sink Current Latch Input Voltage
7
MB3778
(Continued) (Ta = +25 C, VCC = 6 V) Parameter Error Amp Block Input Offset Voltage Input Offset Current Input Bias Current Common Mode Input Voltage Range Voltage Gain Frequency Band Width Common Mode Rejection Ratio Max Output Voltage Width Output Sink Current Output Source Current PWM Comparator Block Input Threshold Voltage (fOSC = 10 kHz) On duty Cycle Input Sink Current Input Source Current Control Block Input Off Condition Input On Condition Control Terminal Current Output Block Output Leak Current Output Saturation Voltage All Device Block Stand-by Current Average Supply Current ICCS ICCa VCTL = 0 V VCTL = VCC, No Output Load 1.7 10 2.4 A mA Leak VSAT VO = 18 V IO = 50 mA 1.1 10 1.4 A V VOFF VON ICTL VCTL = 10 V 2.1 200 0.7 400 V V A Vt100 Vt0 Dtr IIN+ IIN- Duty Cycle = 100% Duty Cycle = 0% Vdt = VREF/1.45 Pin 5, Pin 12 = 1.6 V Pin 5, Pin 12 = 1.6 V 1.05 55 1.9 1.3 65 1.0 -60 2.25 75 V V % mA A VIO IIO IB VICR AV BW CMRR VOM+ VOM- IOM+ IOM- VO = 1.6 VO = 1.6 VO = 1.6 V VO = 1.6 V VO = 1.6 V VCC = 3.6 V to 18 V RNF = 200 k AV = 0 dB -6 -100 -500 1.05 70 60 VREF - 0.3 -100 80 1.0 80 0.7 1.0 -60 +6 +100 1.45 0.9 mV nA nA V dB MHz dB V V mA A Symbol Condition Value Min Typ Max Unit
8
MB3778
TEST CIRCUIT
CTL TEST SW 4.7 k CPE OUTPUT 1 4.7 k OUTPUT 2 16 15 14 13 12 11 10 9 INPUT VCC = 6 V
MB3778
1 2 3 4 5 6 7 8
330 pF
15 k
TEST INPUT
TIMING CHART (Internal Waveform)
Triangular waveform oscillator output Short circuit protection comparator Reference 2.1 V 1.9 V input 1.6 V Dead Time, PWM input voltage 1.3 V Error Amp output PWM comparator output Output Transistor collector waveform S.C.P. Terminal waveform Short circuit protection comparator output Control Input voltage
"High" "Low" "High" "Low" 0.65 V 0.05 V "High" "Low" Power "ON" 2.1 V (VCTL : Min Value) 0V 3.6 V (VCC : Min Value) 0V Power "OFF" tPE DEAD TIME 100%
Power supply voltage
Protection Enable Time tPE
0.6 x 106 x CPE (s)
9
MB3778
APPLICATION CIRCUIT
* Chopper Type Step Down/inverting
CTL VIN (10 V)
820 pF 1 8.2 k 2 1.8 k 3 4.7 k 150 k 4 13 14 1.8 k 15 16 0.1 F 56 H
4.7 k
0.033 F
MB3778
5 12
150 k
0.033 F 10 k 220 F -+
4.7 k
10 k 6 -+ 1 F 7 10 11
+- 1 F
8
9
5.6 k 2.4 k
330 330 330 120 H 120 H -+ 220 F VO+ ( 5 V) 330
-+ 9.1 k VO- ( -5 V) 220 F
GND
10
MB3778
* Chopper Type Step Up/Inverting
CTL VIN (5 V)
820 pF 1 8.2 k 2 1.8 k 3 4.7 k 150 k 4 13 14 1.8 k 15 16 0.1 F 56 H
4.7 k 0.033 F 4.7 k
MB3778
5 12
150 k
0.033 F 10 k 220 F -+
10 k 6 -+ 1 F 7 10 11
+- 1 F
8
9 16 k
4.7 k
330 3.9 k
330
120 H 100
120 H
220 F -+ 9.1 k VO- ( -5 V)
220 F +-
GND
VO+ ( 5 V)
11
MB3778
* Multi Output Type (Apply Transformer)
CTL VIN (10 V)
820 pF 1 8.2 k 2 15 16 0.1 F 56 H
3
14 1.8 k
4
13
MB3778
5 12
150 k
0.033 F 10 k
220 F -+
6
11
7
10
8
9 1.8 k
4.7 k
220
1000 pF 5.6 k
-+ 220 F
-+ 220 F
-+ 220 F
-+ 220 F
VO2- ( -12 V)
VO1- ( -5 V)
GND
VO2+ ( 5 V)
VO1+ ( 12 V)
12
MB3778
HOW TO SET THE OUTPUT VOLTAGE
The output voltage is set using the connections shown in "Connection of error Amp Output Voltage V0 0" and "Connection of Error Amp Output Voltage V0 < 0". The error amplifier power is supplied by the reference voltage circuit as is that of the other internal circuits. The common mode input voltage range is from 1.05 V to 1.45 V. Set 1.23 V (VREF/2) as the reference input voltage that is connected to either inverting or non-inverting input terminals. * Connection of Error Amp Output Voltage V0 0
VREF
VO+
R
R1 +
VO + =
VREF 2 x R2
(R1 + R2)
PIN 5 or PIN 12 - R R2 RNF
* Connection of Error Amp Output Voltage V0 < 0
VREF
VO- = -
VREF 2 x R1
(R1 + R2) + VREF
R
R1 + PIN 5 -
R
R2
RNF
VO-
13
MB3778
HOW TO SET TIME CONSTANT FOR TIMER LATCH SHORT-CIRCUIT PROTECTION CIRCUIT
Below Figure shows the configuration of the protection latch circuit. Each error amplifier output is connected to the inverting inputs of the short-circuit protection comparator and is always compared with the reference voltage (2.1 V) connected to the non-inverting input. When the load condition of the switching regulator is stable, the error amplifier has no output fluctuation. Thus, short-circuit protection control is also kept in balance, and the SCP terminal (pin 15) voltage is held at about 50 mV. If the load changes drastically due to a load short-circuit and if the inverting inputs of the short-circuit protection comparator go above 2.1 V, the short-circuit protection comparator output goes "Low" to turn off transistor Q1. The SCP terminal voltage is discharged, and then the short-circuit protection comparator charges the protection enable capacitor CPE according to the following formula : VPE = 50 mV + tPE x 10 - 6 / CPE 0.65 = 50 mV + tPE x 10 - 6 / CPE CPE = tPE / 0.6 (F) When the protection enable capacitor is charged to about 0.65 V, the protection latch is set to enable the under voltage lockout circuit and the output drive transistor is turned off. The idle period is also set to 100% at the same time. Once the under voltage lockout circuit is enabled, the protection enable is released; however, the protection latch is not reset if the power is not turned off. The inverting inputs (pin 6 or 11) of the D.T.C. comparator are compared to the reference voltage (about 1.1 V) connected to the non-inverting input. To prevent malfunction of the short-circuit protection-circuit when the soft-start operation is done by using the DTC terminal (pin 6 or 11) , the D.T.C. comparator outputs a "High" level while the DTC terminal (pin 6 or 11) goes up to about 1.1 V, and then closes the SCP terminal (pin 15) by turning transistor Q2 on. * Protection Latch Circuit
2.46 V 1 A S.C.P. Comp. R1 Error Amp1 Error Amp2 2.1 V - - + SCP 15 CPE Q1 Q2 Q3 SR Latch U.V.L.O.
- - + D.T.C. Comp. 1.1 V
6 11
DTC1 DTC2
14
MB3778
SETTING THE IDLE PERIOD
When voltage step-up, fly-back step-up or inverted output are set, the voltage at the FB terminal may go higher than the triangular wave voltage due to load fluctuation, etc. In this case the output transistor will be in full-on state(ON duty 100%). This can be prevented by setting the maximum duty for the output transistor. This is done by setting the DTC1 terminal (pin 6) voltage using resistance division of the VREF voltage as illustrated below. When the DTC1 terminal voltage is higher than the triangular waveform voltage, the output transistor is turned on. If the triangular waveform amplitude specified by the maximum duty calculation formula is 0.6 V, and the lower voltage limit of the triangular waveform is 1.3 V, the formula would be as follows (other channels are similar) : Duty (ON) max (%) = (Vdt - 1.3 V) / 0.6 V x 100, Vdt (V) = Rb / (Ra + Rb) x VREF : Also, if no output duty setting is required, the voltage should be set greater than the upper limit voltage of the triangular waveform, which is 1.9 V. * Setting the idle time at DTC1 (DTC2 is similar)
VREF 16 Ra DTC1 6 Rb Vdt
15
MB3778
SETTING THE SOFT START TIME
When power is switched on, the current begins charging the capacitor (CDTC1) connected the DTC1 terminal (pin 6). The soft start process operates by comparing the soft start setting voltage, which is proportional to the DTC1 terminal voltage, with the triangular waveform, and varying the ON-duty of the OUT terminal (pin 7). The soft start time until the ON duty reaches 50% is determined by the following equation: Soft start time (time until output ON duty = 50%) . ts (s) = - CDTC1 x Ra x Rb / (Ra + Rb) x ln (1 - 1.6 (Ra + Rb) / (2.46 Rb) ) : For example, if Ra = 4.7 k and Rb = 10 k, the result is: ts (s) = 0.01 x CDTC1 (F) : * Soft Start on DCT1 terminal (DTC2 is similar)
VREF 16 Ra DTC1 6 Rb CDTC1
16
MB3778
USING THE RT TERMINAL
The triangular waves, as shown in Figure "No VREF/2 connection to external circuits from RT terminal", act to set the oscillator frequency by charging and discharging the capacitor connected to the CT terminal using the current value of the resistor connected to the RT terminal. In addition, when voltage level VREF/2 is output to external circuits from the RT terminal (pin 2) , care must be taken in making the external circuit connections to adjust for the fact that I1 is increased by the value of the current I2 to the external circuits in determining the oscillator frequency (see Figure "VREF/2 connection to external circuits from RT terminal"). * No VREF/2 connection to external circuits from RT terminal
Triangular wave oscillator ICT = IRT = VREF 2RT
( VREF ) 2
2 IRT RT CT 1 ICT
* VREF/2 connection to external circuits from RT terminal
Triangular wave oscillator
ICT = IRT = I1 + I2 VREF = + I2 2RT
( VREF ) 2
2 IRT To external circuits I2 I1 RT CT 1 ICT
17
MB3778
SYNCHRONIZATION OF ICs
A fixed condenser and resistor are inserted in the CT and RT terminals of IC which becomes a master when synchronizing by using plurality of MB3778. As a result, the slave ICs oscillate automatically. The RT terminals (pin 2) of the slave ICs are connected to the VREF terminal (pin 16) to disable the charge/discharge circuit for triangular wave oscillation. The CT terminals of the master and slave ICs are connected together. * Connection of Master, Slave
MB3778
(MASTER)
VCC
CT
RT
MB3778
(SLAVE)
MB3778
(SLAVE)
18
MB3778
TYPICAL CHARACTERISTICS
Reference voltage vs. Power supply voltage
5.0 Reference voltage VREF (V) Ta = +25 C
Average supply current vs. Power supply voltage
Average supply current ICCa (mA) 2.0 Ta = +25 C
2.5
1.0
0 0 4 8 12 16 20 Power supply voltage VCC (V)
0 0 4 8 12 16 20 Power supply voltage VCC (V)
Reference voltage vs. Operating ambient temperature
VCC = VCTL = 6 V IOR = -1 mA Triangular waveform Upper / Lower Limit voltage (V) 2.47 2.46 Reference voltage VREF (V) 2.45 2.44 2.43 2.42 2.41 2.40 -40
Triangular waveform Upper/Lower Limit voltage vs. Timing capacitor
2.2 2.0 1.8 1.6 1.4 1.2
Upper limit
Lower limit
1.0 0.8 102 103 Timing capacitor CT (pF)
VCC = 6 V RT = 15 k Ta = +25 C 104
-20
0
+20
+40
+60
+80
+100
Operating ambient temperature Ta (C)
Collector saturation voltage vs. Sink Current
5.0 Error Amp Max output voltage (V) Collector saturation voltage (V) VCC = 6 V Ta = +25 C 4.0 3.0
Error Amp Max output voltage vs. Frequency
VCC = 6 V Ta = +25 C 2.0
3.0
1.0
2.0
1.0
0 100
500 1 k
5 k 10 k Frequency (Hz)
50 k 100 k
500 k
0 0 100 200 300 400 Sink current (mA) 500
(Continued) 19
MB3778
Oscillation frequency vs.Timing resistor
VCC = 6 V Ta = +25 C 100 Oscillation frequency fOSC (Hz) Triangular waveform cycle (s) 1M VCC = 6 V RT = 15 k Ta = +25 C
Triangular waveform cycle vs. Timing capacitor
10
100 k CT = 150 pF
10 k
CT = 1500 pF 1 102 CT = 15000 pF 103 104 Timing capacitor CT (pF) 105
1k 1k
5 k 10 k 50 k100 k Timing resistor RT ()
500 k
Frequency stability vs. Operating ambient temperature
10 Frequency stability fdT (%) ON duty cycle Dtr (%) VCC = 6 V CT = 330 pF RT = 15 k 100 80 60 40 20 0
ON duty cycle vs. Oscillation frequency
VCC = 6 V CT = 330 pF RT = 15 k Ta = +25 C
0
-10
-40
-20
0
+20
+40
+60
+80 +100 +120
5k
10 k
50 k 100 k
500 k 1 M
Operating ambient temperature Ta (C)
Oscillation frequency fOSC (Hz)
Reference voltage vs. Control voltage
Reference voltage VREF (V) 5.0 VCC = 6 V Ta = +25 C
Control terminal current vs. Control input voltage
Control terminal current ICTL (A) 500 VCC = 6 V Ta = +25 C
2.5
250
0
0
1
2
3
4
5
0
0
Control voltage VCTL (V)
4 8 12 16 Control input voltage VCTL (V)
20
(Continued) 20
MB3778
Voltage gain/Phase vs. Frequency Voltage gain/Phase vs. Frequency (Actual Data)
180 Voltage gain AV (dB) 90 0 40 AV Phase (deg) Phase (deg) 20 0 -20 -40 10 100 1k 10 k Frequency f (Hz) 100 k 90 0 CNF = 0.047 F 180
40 Voltage gain AV (dB) 20 0 -20 -40 10 100 1k
CNF = OPEN AV
-90
Phase (deg)
-90 -180 1M
-180 10 k 100 k 1M
Frequency f (Hz)
Voltage gain/Phase vs. Frequency (Actual Data)
CNF = 470 pF 40 Voltage gain AV (dB) Phase (deg) 20 0 -20 -40 10
Voltage gain/Phase vs. Frequency (Actual Data)
CNF = 4700 pF AV 90 0 180
40 Voltage gain AV (dB) 20 0
180 90 0 -90 -180
AV
-20 -40 10 100
-90 -180
1k 10 k Frequency f (Hz)
100 k
1M
100
1k 10 k Frequency f (Hz)
100 k
1M
Actual Circuit
VREF VREF CNF
4.7 k 4.7 k - 10 F -+ 4.7 k 4.7 k OUT + Error Amp 240 k
IN
(Continued)
21
MB3778
(Continued) Power Dissipation vs. Operating ambient temperature (SOP)
700 620 600 500 400 300 200 100 0 -40 -20 0 +20 +40 +60 +80 +100
Power Dissipation vs. Operating ambient temperature (SSOP)
500 444 400 300 200 100 0 -40
Power dissipation PD (mW)
Power dissipation PD (mW)
-20
0
+20
+40
+60
+80
+100
Operating ambient temperature Ta (C)
Operating ambient temperature Ta (C)
22
MB3778
EQUIVALENT SERIES RESISTOR AND STABILITY OF SMOOTHING CAPACITOR
The equivalent series resistor (ESR) of the smoothing capacitor in the DC/DC converter greatly affects the loop phase characteristic. The stability of the system is improved so that the phase characteristic may advance the phase to the ideal capacitor by ESR in the high frequency region (see "Voltage gain vs. Frequency" and "Phase vs. Frequency"). A smoothing capacitor with a low ESR reduces system stability. Use care when using low ESR electrolytic capacitors (OS-CONTM) and tantalum capacitors. Note: OS-CON is a trademark of Sanyo Electric Co., Ltd. DC/DC Converter Basic Circuit
Tr
L
RC VIN D C RL
Voltage gain vs. Frequency
Phase vs. Frequency
20 Voltage gain AV (dB)
0
Phase (deg)
0 -20 -40 -60 10
(2) -90
(2)
(1) : RC = 0 (2) : RC = 31 m 100
(1) 100 k
-180 10
(1) : RC = 0 (2) : RC = 31 m
(1)
1k 10 k Frequency f (Hz)
100
1k 10 k Frequency f (Hz)
100 k
23
MB3778
* Reference data If an aluminum electrolytic smoothing capacitor (RC 1.0 ) is replaced with a low ESR electrolytic capacitor (OS-CONTM : RC 0.2 ), the phase margin is reduced by half(see Fig.1 and Fig.2). DC/DC Converter AV vs. characteristic Test Circuit
VOUT VO+
CNF
AV vs. characteristic Between these points - + -IN +IN R1 VIN R2
FB
VREF/2 Error Amp
Figure 1 DC/DC Converter +5 V output Voltage gain/Phase vs. Frequency
60 40 AV 20 0 -20 -40 10 62 VCC = 10 V RL = 25 CP = 0.1 F 180 90 0 -90 -180 100 k Phase (deg)
Voltage gain AV (dB)
VO+ + - AI Capacitor 220 F (16 V) RC 1.0 : fOSC = 1 kHz GND
100
1k Frequency f (Hz)
10 k
Figure 2 DC/DC Converter +5 V output Voltage gain/Phase vs. Frequency
60 AV 40 Voltage gain AV (dB) 20 0 -20 -40 10 27 0 VCC = 10 V RL = 25 CP = 0.1 F 180 90 Phase (deg)
VO+ + - OS-CONTM 22 F (16 V) RC 0.2 : fOSC = 1 kHz GND
-90 -180 100 k
100
1k Frequency f (Hz)
10 k
24
MB3778
NOTES ON USE
* Take account of common impedance when designing the earth line on a printed wiring board. * Take measures against static electricity. - For semiconductors, use antistatic or conductive containers. - When storing or carrying a printed circuit board after chip mounting, put it in a conductive bag or container. - The work table, tools and measuring instruments must be grounded. - The worker must put on a grounding device containing 250 k to 1 M resistors in series. * Do not apply a negative voltage - Applying a negative voltage of -0.3 V or less to an LSI may generate a parasitic transistor, resulting in malfunction.
ORDERING INFORMATION
Part number MB3778PFV- MB3778PF- MB3778PFV-E1 MB3778PF-E1 Package 16-pin plastic SSOP (FPT-16P-M05) 16-pin plastic SOP (FPT-16P-M06) 16-pin plastic SSOP (FPT-16P-M05) 16-pin plastic SOP (FPT-16P-M06) Remarks Conventional version Conventional version Lead Free version Lead Free version
RoHS Compliance Information of Lead (Pb) Free version
The LSI products of Fujitsu with "E1" are compliant with RoHS Directive , and has observed the standard of lead, cadmium, mercury, Hexavalent chromium, polybrominated biphenyls (PBB) , and polybrominated diphenyl ethers (PBDE) . The product that conforms to this standard is added "E1" at the end of the part number.
25
MB3778
MARKING FORMAT (Lead Free version)
MB3778
XXXX XXX
E1
INDEX
SOP-16 (FPT-16P-M06)
Lead Free version
Lead Free version
3778
E1XXXX XXX
SSOP-16 (FPT-16P-M05)
INDEX
26
MB3778
LABELING SAMPLE (Lead free version)
lead-free mark JEITA logo JEDEC logo
MB123456P - 789 - GE1
(3N) 1MB123456P-789-GE1 1000
G
Pb
(3N)2 1561190005 107210
QC PASS
PCS 1,000 MB123456P - 789 - GE1
2006/03/01
ASSEMBLED IN JAPAN
1/1
MB123456P - 789 - GE1
0605 - Z01A 1000
1561190005
Lead Free version
27
MB3778
MB3778PF-E1, MB3778PFV-E1 RECOMMENDED CONDITIONS OF MOISTURE SENSITIVITY LEVEL
Item Mounting Method Mounting times Before opening Storage period From opening to the 2nd reflow When the storage period after opening was exceeded Storage conditions Condition IR (infrared reflow) , Manual soldering (partial heating method) 2 times Please use it within two years after Manufacture. Less than 8 days Please processes within 8 days after baking (125 C, 24H)
5 C to 30 C, 70%RH or less (the lowest possible humidity)
[Temperature Profile for FJ Standard IR Reflow] (1) IR (infrared reflow) H rank : 260 C Max
260 C 255 C
170 C to 190 C
RT
(b)
(c)
(d)
(e)
(a)
(d')
(a) Temperature Increase gradient (b) Preliminary heating (c) Temperature Increase gradient (d) Actual heating (d')
(e) Cooling
: Average 1 C/s to 4 C/s : Temperature 170 C to 190 C, 60s to 180s : Average 1 C/s to 4 C/s : Temperature 260 C Max; 255 C or more, 10s or less : Temperature 230 C or more, 40s or less or Temperature 225 C or more, 60s or less or Temperature 220 C or more, 80s or less : Natural cooling or forced cooling
Note : Temperature : the top of the package body (2) Manual soldering (partial heating method) Conditions : Temperature 400 C Max Times : 5 s max/pin 28
MB3778
PACKAGE DIMENSIONS
16-pin plastic SOP Lead pitch Package width x package length Lead shape Sealing method Mounting height Weight 1.27 mm 5.3 x 10.15 mm Gullwing Plastic mold 2.25 mm MAX 0.20 g P-SOP16-5.3x10.15-1.27
(FPT-16P-M06)
Code (Reference)
16-pin plastic SOP (FPT-16P-M06)
*110.15 -0.20 .400 -.008
16
+0.25 +.010
Note 1) *1 : These dimensions include resin protrusion. Note 2) *2 : These dimensions do not include resin protrusion. Note 3) Pins width and pins thickness include plating thickness. Note 4) Pins width do not include tie bar cutting remainder.
0.17 -0.04
9
+0.03 +.001
.007 -.002
INDEX
*2 5.300.30
7.800.40 (.209.012) (.307.016) Details of "A" part 2.00 -0.15 .079 -.006
+0.25 +.010
(Mounting height)
1
8
"A" 0.13(.005)
0.25(.010) 0~8
1.27(.050)
0.470.08 (.019.003)
M
0.500.20 (.020.008) 0.600.15 (.024.006)
0.10 -0.05
+0.10 +.004
.004 -.002 (Stand off)
0.10(.004)
C
2002 FUJITSU LIMITED F16015S-c-4-7
Dimensions in mm (inches). Note: The values in parentheses are reference values.
(Continued)
29
MB3778
(Continued)
16-pin plastic SSOP
Lead pitch Package width x package length Lead shape Sealing method Mounting height Weight
0.65 mm 4.40 x 5.00 mm Gullwing Plastic mold 1.45mm MAX 0.07g P-SSOP16-4.4x5.0-0.65
(FPT-16P-M05)
Code (Reference)
16-pin plastic SSOP (FPT-16P-M05)
*1 5.000.10(.197.004)
16 9
Note 1) *1 : Resin protrusion. (Each side : +0.15 (.006) Max). Note 2) *2 : These dimensions do not include resin protrusion. Note 3) Pins width and pins thickness include plating thickness. Note 4) Pins width do not include tie bar cutting remainder.
0.170.03 (.007.001)
INDEX
*2 4.400.10 6.400.20 (.173.004) (.252.008)
Details of "A" part 1.25 -0.10 .049 -.004 LEAD No.
1 8
+0.20 +.008
(Mounting height)
0.65(.026)
"A" 0.240.08 (.009.003) 0.13(.005)
M
0~8 0.100.10 (Stand off) (.004.004) 0.25(.010)
0.10(.004)
0.500.20 (.020.008) 0.600.15 (.024.006)
C
2003 FUJITSU LIMITED F16013S-c-4-6
Dimensions in mm (inches). Note: The values in parentheses are reference values.
30
MB3778
FUJITSU LIMITED
All Rights Reserved. The contents of this document are subject to change without notice. Customers are advised to consult with FUJITSU sales representatives before ordering. The information, such as descriptions of function and application circuit examples, in this document are presented solely for the purpose of reference to show examples of operations and uses of Fujitsu semiconductor device; Fujitsu does not warrant proper operation of the device with respect to use based on such information. When you develop equipment incorporating the device based on such information, you must assume any responsibility arising out of such use of the information. Fujitsu assumes no liability for any damages whatsoever arising out of the use of the information. Any information in this document, including descriptions of function and schematic diagrams, shall not be construed as license of the use or exercise of any intellectual property right, such as patent right or copyright, or any other right of Fujitsu or any third party or does Fujitsu warrant non-infringement of any third-party's intellectual property right or other right by using such information. Fujitsu assumes no liability for any infringement of the intellectual property rights or other rights of third parties which would result from the use of information contained herein. The products described in this document are designed, developed and manufactured as contemplated for general use, including without limitation, ordinary industrial use, general office use, personal use, and household use, but are not designed, developed and manufactured as contemplated (1) for use accompanying fatal risks or dangers that, unless extremely high safety is secured, could have a serious effect to the public, and could lead directly to death, personal injury, severe physical damage or other loss (i.e., nuclear reaction control in nuclear facility, aircraft flight control, air traffic control, mass transport control, medical life support system, missile launch control in weapon system), or (2) for use requiring extremely high reliability (i.e., submersible repeater and artificial satellite). Please note that Fujitsu will not be liable against you and/or any third party for any claims or damages arising in connection with above-mentioned uses of the products. Any semiconductor devices have an inherent chance of failure. You must protect against injury, damage or loss from such failures by incorporating safety design measures into your facility and equipment such as redundancy, fire protection, and prevention of over-current levels and other abnormal operating conditions. If any products described in this document represent goods or technologies subject to certain restrictions on export under the Foreign Exchange and Foreign Trade Law of Japan, the prior authorization by Japanese government will be required for export of those products from Japan. Edited Business Promotion Dept.
F0605

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