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APW7134
Dual 1.5MHz, 600mA Synchronous Step-Down Converter
Features * * * * * * * * * * * * *
600mA Output Current on Each Channel 2.5V to 5.5V Input Voltage Range 1.5MHz Constant Frequency Operation Low Dropout Operation at 100% Duty Cycle Synchronous Topology 0.6V Low Reference Voltage Typically 0.1 A Shutdown Current Current Mode Operation Over Temperature Protection Over Current Protection Up to 94% Efficiency Internally Compensated Lead Free Available (RoHS Compliant)
General Description
The APW7134 contains two independent 1.5MHz constant frequency, current mode, PWM step-down converters. Each converter integrates a main switch and a synchronous rectifier for high efficiency without an external Schottky diode. The APW7134 is ideal for powering portable equipment that runs from a single cell Lithium-Ion (Li+) battery. Each converter can supply 600mA of load current from a 2.5V to 5.5V input voltage. The output voltage can be regulated as low as 0.6V. The APW7134 can also run at 100% duty cycle for low dropout applications.
Pinouts
APW7134 (Top View) DFN-10 (3mm x 3mm)
EN1 1 2 3 10 SW1 9 GND1 8 IN1 7 FB2 6 EN2
Applications * *
TV Tuner/Box Portable Instrument
FB1 IN2
GND2 4 SW2 5
Exposed pad on backside
ANPEC reserves the right to make changes to improve reliability or manufacturability without notice, and advise customers to obtain the latest version of relevant information to verify before placing orders. Copyright (c) ANPEC Electronics Corp. Rev. A.1 - Aug., 2006 1 www.anpec.com.tw
APW7134
Ordering and Marking Information
APW7134 Lead Free Code Handling Code Temp. Range Package Code Package Code QA : DFN-10 Temp. Range I : -40 to 85 C Handling Code TU : Tube TR : Tape & Reel Lead Free Code L : Lead Free Device Blank : Original Device
APW7134 QA:
APW 7134 XXXXX
XXXXX - Date Code
Note: ANPEC lead-free products contain molding compounds/die attach materials and 100% matte tin plate termination finish; which are fully compliant with RoHS and compatible with both SnPb and lead-free soldiering operations. ANPEC lead-free products meet or exceed the lead-free requirements of IPC/JEDEC J STD-020C for MSL classification at lead-free peak reflow temperature.
Block Diagram
Slop Compensation
ICOMP
Frequency Shift FB1/ FB2 0.6V RQ SQ EN1/ EN2 Shutdown Control Logic RSENSE EA QSENSE QP SW1/ SW2 QN Oscillator IN1/ IN2
IRCMP
GND1/ GND2
Diagram Represents 1/2 of the APW7134
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APW7134
Pin Description
Pin No. 1 Name EN1 Function Channel 1 Enable Control Input. Drive EN1 above 1.5V to turn on the Channel 1. Drive EN1 below 0.3V to turn it off. In shutdown situation, all functions are disabled to decrease the supply current below 1A.There is no pull high or pull low ability inside. Channel 1 Feedback Input. Connect FB1 to the center point of the external resistor divider. The feedback voltage is 0.6V. Channel 2 Supply Input. Bypass to GND with a 4.7F or greater ceramic capacitor. Ground 2. Connected the exposed pad to GND2. Channel 2 Power Switch Output. Inductor connection to drains of the internal PMOSFET and NMOSFET switches. Channel 2 Enable Control Input. Drive EN2 above 1.5V to turn on the Channel 2. Drive EN2 below 0.3V to turn it off. In shutdown situation, all functions are disabled to decrease the supply current below 1A.There is no pull high or pull low ability inside. Channel 2 Feedback Input. Connect FB2 to the center point of the external resistor divider. The feedback voltage is 0.6V. Channel 1 Supply Input. Bypass to GND with a 4.7F or greater ceramic capacitor. Ground 1. Connected the exposed pad to GND1. Channel 1 Power Switch Output. Inductor connection to drains of the internal PMOSFET and NMOSFET switches.
2 3 4 5
FB1 IN2 GND2 SW2
6
EN2
7 8 9 10
FB2 IN1 GND1 SW1
Absolute Maximum Ratings
Symbol VIN1/IN2 VFB1/FB2 VEN1/EN2 VSW1/SW2 ISW_PEAK TJ TSTG TSDR VESD Parameter Input Supply Voltage (IN1/IN2 to GND1/GND2) Voltage on FB1 and FB2 Voltage on EN1 and EN2 Voltage on SW1 and SW2 Peak SW Current Junction temperature Storage temperature Soldering temperature, 10 seconds Minimum ESD rating (Human body mode) (Note 1) Value -0.3 ~ 6 -0.3 ~ VIN1/IN2+0.3 -0.3 ~ VIN1/IN2+0.3 -0.3 ~ VIN1/IN2+0.3 1.3 150 -65 ~ 150 300 3 Unit V V V V A C C C KV
Note 1: The device is ESD sensitive. Handling precautions are recommended.
Thermal Characteristics
Symbol JA Parameter Junction-to-Ambient Resistance in free air (Note 2) Value 50 Unit C/W
Note 2: JA is measured on approximately 1 square of 1 oz copper.
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APW7134
Recommended Operating Conditions (Note 3)
Symbol VIN1/IN2 R2/R4 IOUT TA TJ Parameter Input Supply Voltage (IN1/IN2 to GND1/GND2) Feedback Resistance (Note 3) Output Current Operating ambient temperature Operating junction temperature Min. 2.5 Value Typ. Max. 5.5 200 600 85 125 Unit V K mA C C
-40 -40
Note 3: Please refer to the typical application circuit.
Electrical Characteristics
The * denotes the specifications that apply over TA = -40C ~ 85C, otherwise specifications are at TA=25C
Symbol
Parameter
Test Conditions Min. * VFB1/FB2=0.6V * * 2.5 -30 0.588
APW7134 Typ. Max. 5.5 30 0.6 0.612
Unit V nA V
VIN1/IN2 Each Converter Input Voltage Range IFB1/FB2 Each Converter Feedback current VFB1/FB2 VFB1/FB2 Each Converter Regulated Feedback Voltage Each Converter Reference voltage Line regulation VIN1/IN2=2.5V to 5.5V VIN1/IN2=3V,VFB=0.5V IPK Each Converter Peak Inductor Current or VOUT=90%, Duty cycle < 35% VLOADR Each Converter Load Regulation IQ Each Converter Quiescent Current Duty Cycle=0; VFB=1.5V
*
0.04
0.4
%/V
0.75
1
1.25
A
0.5 300 400
% A
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APW7134
Electrical Characteristics (Cont.)
The * denotes the specifications that apply over TA = -40C ~ 85C, otherwise specifications are at TA=25C
Symbol
Parameter Each Converter Quiescent Current in Shutdown Each Converter Oscillator Frequency
Test Conditions Min.
APW7134 Typ. 0.1 1.2 1.5 210 0.4 0.5 Max. 1 1.8
Unit
IQ-SD fOSC
VEN1/EN2=0V,VIN=4.2V VFB=0.6V VFB=0V ISW=100mA
A MHz KHz
fOSC_FFB Each Converter Frequency Foldback RDS-P Each Converter On Resistance of PMOSFET Each Converter On Resistance of NMOSFET Each Converter SW Leakage Current
RDS-N
ISW=-100mA VEN1=0V,VSW=0V or 5V,VIN=5V
* *
0.35
0.45
ILSW
0.01 0.3 1 0.01
1 1.5 1
A V A
VEN1/EN2 Each Converter Enable Threashold IEN1/EN2 EN1/EN2 Leakage Current
Application Circuit
VIN1/IN2 CIN1 4.7uF OFF ON VOUT1 1.8V 600mA L1 2.2uH 8 IN1 1 EN1 IN2 EN2 6 L2 2.2uH 3 CIN2 4.7uF OFF ON VOUT2 3.3V 600mA
R5 100K
R6 100K
10
SW1
APW7134
SW2
5
R1 300K COUT1 10uF R2 150K
2
FB1 GND1 GND2 9 4
FB2
7
R3 680K R4 150K COUT2 10uF
Typical Application
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APW7134
Typical Operating Characteristics
Reference Voltage
0.615 0.610
VIN=5.5V
Oscillator Frequency
1800 1700
Reference Voltage (V)
Frequency (KHz)
0.605 0.600 0.595 0.590 0.585 -50 -25 0 25 50
VIN=2.5V
1600 1500 1400 1300 1200
VIN=3.6V
75
100
125
-50
-25
0
25
50
75
100
125
Temperature (o C)
Temperature (o C)
Oscillator Frequency vs Supply Voltage
1800
700
RDS(ON) vs Temperature
VIN=2.7V
TA=25o C
1700 1600 1500 1400 1300 1200 2 3 4 5 6
600
VIN=4.2V VIN=3.6V
ON Resistance (m)
Frequency (KHz)
500 400 300 200 100 0 -50 -25 0 25 50 75 100 125 NMOS PMOS
Supply Voltage (V)
Temperature (o C)
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APW7134
Typical Operating Characteristics (Cont.)
RDS(ON) vs Input Voltage
600 500
Efficiency vs Output Current
100 90
PMOS
VOUT=1.2V TA=25o C
VIN=2.7V
ON Resistance (m)
80 70
Efficiency (%)
400 300
NMOS
60 50 40 30 20 10
VIN=3.6V
200 100 0 0 1 2 3 4 5 6
VIN=4.2V
0 0.1 1.0 10.0 100.0 1000.0
Input Voltage (V)
Output Current (mA)
Efficiency vs Output Current
100 90 80 70
100
Efficiency vs Output Current
VOUT=1.5V TA=25o C
VIN=2.7V
90 80
VOUT=2.5V TA=25o C
VIN=4.2V
Efficiency (%)
VIN=3.6V
70
60 50 40 30 20 10 0 0.1 1.0 10.0 100.0 1000.0
Efficiency (%)
VIN=3.6V
60 50 40 30 20 10 0 0.1 1.0 10.0 100.0 1000.0
VIN=4.2V
VIN=2.7V
Output Current (mA)
Output Current (mA)
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APW7134
Typical Operating Characteristics (Cont.)
Efficiency vs Input Voltage
100 95 90
Efficiency vs Input Voltage
100 95
IOUT=100mA
IOUT=600mA
IOUT=100mA
90 85
Efficiency (%)
85 80 75
Efficiency (%)
IOUT=600mA
80 75 70 65 60
VOUT=1.8V TA=25o C
IOUT=10mA
IOUT=10mA
70 65 60 55 50 2 3 4 5 6
VOUT=1.5V TA=25o C
55 50 2
3
4
5
6
Input Voltage (V)
Input Voltage (V)
Efficiency vs Input Voltage
100 95 90 85
Dynamic Supply Current vs Supply Voltage
400
IOUT=100mA
380
Dynamic Supply Current (A)
5 6
360 340 320 300 280 260 240 220 200 2 3 4 5 6
Efficiency (%)
IOUT=600mA
80 75 70 65 60 55 50 2 3 4
IOUT=10mA
VOUT=2.5V TA=25o C
Input Voltage (V)
Supply Voltage (V)
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APW7134
Typical Operating Characteristics (Cont.)
PMOSFET Leakage vs Temperature
300 250 200 150 100 50 0 -50 -25 0 25 50 75 100 125
NMOSFET Leakage vs Temperature
800 750 700 650 600 550 500 -50 -25 0 25 50 75 100 125
PMOSFET Leakag(nA)
VIN=5.5V
NMOSFET Leakage(nA)
VIN=5.5V
Temperature (o C)
Temperature (o C)
Functional Descriptions
Main Control Loop The APW7134 has dual independent constant frequency current mode PWM step-down converters. All the main and synchronous switches are internal to reduce the external components. During normal operation, the internal PMOSFET is turned on, but is turned off when the inductor current at the input of ICOMP to reset the RS latch. The load current increases, it causes a slight decrease in the feedback voltage, which in turn, causes the EA' output voltage to ins crease until the average inductor current matches the new load current. While the internal power PMOSFET is off, the internal power NMOSFET is turned on until the inductor current starts to reverse, as indicated by the current reversal comparator IRCMP, or the beginning of next cycle. When the NMOSFET is turned off by IRCMP, it operates in the discontinuous conduction mode. In the short circuit situation, the output voltage is almost zero volts. Output current is limited by the ICOMP to prevent the damage of electrical circuit. In the normal operation, the two straight line of the inductor current ripple have the same height, it means the volts-seconds product is the same. When the short circuit operation occurs, the output voltage down to
Copyright (c) ANPEC Electronics Corp. Rev. A.1 - Aug., 2006 9 www.anpec.com.tw
Pulse Skipping Mode Operation At light load with a relative small inductance, the inductor current may reach zero. The internal power NMOSFET is turned off by the current reversal comparator, IRCMP, and the switching voltage will ring. This is discontinuous mode operation, and is normal behavior for the switching regulator. At very light load, the APW7134 will automatically skip some pulses in the pulse skipping mode to maintain the output regulation. The skipping process modulates smoothly depend on the load. Short Circuit Protection
APW7134
Functional Descriptions (Cont.)
Short Circuit Protection Cont. zero leads to the voltage across the inductor maximum in the on period and the voltage across the inductor minimum in the off period. In order to maintain the volts-seconds balance, the off-time must be extended to prevent the inductor current run away. Frequency decay will extend the switching period to provide more times to the off-period, then the inductor current have to restrict to protect the electrical circuit in the short situation. Dropout Operation An important detail to remember is that on resistance of PMOSFET switch will increase at low input supply voltage. Therefore, the user should calculate the power dissipation when the APW7134 is used at 100% duty cycle with low input voltage. Slope Compensation Slope compensation provides stability in constant frequency current mode architecture by preventing sub-harmonic oscillations at high duty cycle. It is accomplished internally by adding a compensating ramp to the inductor current signal at duty cycle in excess of 40%. Normally, this results in a reduction of maximum inductor peak current for duty cycles greater than 40%. In the APW7134, the reduction of inductor peak current recovered by a special skill at high duty ratio. This allow the maximum inductor peak current maintain a constant level through all duty ratio.
Application Description
Inductor Selection selecting a low DC resistance inductor is a helpful way. Due to the high switching frequency as 1.5MHz, the Another important parameter is the DC current rating inductor value of the application field of APW7134 is of the inductor. The minimum value of DC current usually from 1H to 4.7H. The criterion to selecting a rating equals the full load value of 600mA, plus the suitable inductor is dependent on the worst current half of the worst current ripple, 120mA. Choose ripple throughout the inductor. The worst current ripple inductors with suitable DC current rating to ensure defines as 40% of the fully load capability. In the the inductors don' operate in the saturation. t APW7134 applications, the worst value of current ripple is 240mA, the 40% of 600mA. Evaluate L by Input Capacitor Selection equation (1):
L=
The input capacitor must be able to support the
- V OUT V IN
(V IN
) V OUT
1 IL f S
maximum input operating voltage and maximum RMS (1) input current. The Buck converter absorbs current from input in pulses.
where fS is the switching frequency of APW7134 and IL is the value of the worst current ripple, it can be any value of current ripple that smaller than the worst value you can accept. In order to perform high efficiency,
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APW7134
Application Description (Cont.)
Input Capacitor Selection Cont. Observe the waveform of I(CIN),the RMS value of I(CIN) is
I(CIN ) =
I(Q1) IIN I(CIN) Q1 L VIN CIN Q2 I(L) COUT I(COUT) IOUT
[(I
OUT
- IIN ) D + IIN 1- D
2 2
](
)
2
(2)
Replace D and IIN by following relation:
D=
VOUT VIN
(3) (4)
IIN = D IOUT
The RMS value of input capacitor current equal:
I(C IN ) = IOUT D(1 - D ) )
PWM
(5)
Figure-1 Figure-1 shows a schematic of a Buck structure. The waveforms show as Figure-2.
IL IOUT IIN
When D=0.5 the RMS current of input capacitor will be maximum value. Use this value to choose the input capacitor with suitable current rating. Output Capacitor Selection The output voltage ripple is a significant parameter to estimate the performance of a convertor. There are two discrete components that affect the output voltage ripple bigger or smaller. It is recommended to use the criterion has mentioned above to choose a suitable inductor. Then based on this known inductor current ripple condition, the value and properties of output capacitor will affect the output voltage ripple better or worse. The output voltage ripple consists of two portions, one is the product of ESR and inductor current ripple, the other portion is a function of the
I(COUT)
0A
0A
IIN
I(CIN)
0A
inductor current ripple and the output capacitance. Figure-3 shows the waveforms to explain the part decided by the output capacitance.
I(Q1)
IOUT 0A D*TS (1-D)*TS 0A PWM
0.5TS 0A
IL
I(COUT)
VOUT1
V OUT
Figure-2 Figure-3
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APW7134
Application Description (Cont.)
Output Capacitor Selection Evaluate the VOUT1 by the ideal of energy equalization. According to the definition of Q,
Q= 11 1 IL TS = C OUT VOUT 1 22 2
Output Voltage Setting APW7134 has the adjustable version for output volt age setting by the users. A suggestion of maximum (6) value of R2 is 200K to keep the minimum current that provides enough noise rejection ability through the resistor divider. The output voltage programmed by the equation:
R VOUT = 0 .6 1 + 1 R2
VOUT
where TS is the inverse of switching frequency and the IL is the inductor current ripple. Move the COUT to the left side to estimate the value of VOUT1 as equation (7).
VOUT 1 IL TS = 8 C OUT
(11)
(7)
APW7134
As mentioned above, one part of output voltage ripple is the product of the inductor current ripple and ESR of output capacitor. The equation (8) explains the output voltage ripple estimation.
VOUT TS = IL ESL + 8 C OUT
R2 R1
FB
(8) Layout Considerations The high current paths (GND1/GND2, IN1/IN2 and SW1/SW2) should be placed very close to the device with short, direct and wide traces. Input capacitors should be placed as close as possible to the respective IN and GND pins. The external feedback resistors shall be placed next to the FB pins. Keep the switching nodes SW1/SW2 short and away from the feedback network.
Thermal Considerations APW7134 is a high efficiency switching converter, it means less power loss transferred into heat. Due to the on resistance difference between internal power PMOSFET and NMOSFET, the power dissipation in the high converting ratio is greater than low converting ratio. The worst case is in the dropout operation, the mainly conduction loss dissipate on the internal power PMOSFET. The power dissipation nearly defined as:
PD = (IOUT ) RDS_ ONP D + RDS_ ONN (1- D)
2
[
]
(9)
APW7134 has internal over temperature protection. W hen the junction temperature reaches 150 centigrade, APW7134 will turn off both internal power PMOSFET and NMOSFET. The estimation of the junction temperature, TJ, defined as:
TJ = PD JA
(10)
where the JA is the thermal resistance of the package utilized by APW7134.
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APW7134
Package Information
DFN-10
D A
E
D2
A1 A3
e
Dim A A1 A3 b D D2 E E2 e L
Millimeters Min. Max. 0.80 1.00 0.00 0.05 0.20 REF 0.18 0.30 3.00 BSC 2.20 2.50 3.00 BSC 1.50 1.80 0.50 BSC 0.35 0.45
L
E2
Inches Min. Max. 0.031 0.039 0.000 0.002 0.008 REF 0.007 0.012 0.118 BSC 0.087 0.098 0.118 BSC 0.059 0.071 0.016 BSC 0.014 0.018
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APW7134
Carrier Tape & Reel Dimensions
t E Po P P1 D
F W
Bo
Ao
D1
Ko
T2
J C A B
T1
Application
A 178 1
B
C
J
T1 12.3 1 P1
T2 1.4 0.5 Ao
W 12 0.3 Bo 3.3 0.1
P
E
54.4 0.4 13.0 + 0.2 2.3 0.1 D D1 1.5 + 0.1 Po
8.0 0.1 1.75 0.1 Ko T
DFN-10
F
5.5 0.05 1.5 + 0.1
4.0 0.1 2.0 0.05 3.3 0.1
1.1 0.1 0.3 0.05
(mm)
Cover Tape Dimensions
Application DFN-10 Carrier Width 12 Cover Tape Width 9.2 Devices Per Reel 3000
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APW7134
Physical Specifications
Terminal Material Lead Solderability Solder-Plated Copper (Solder Material : 90/10 or 63/37 SnPb), 100%Sn Meets EIA Specification RSI86-91, ANSI/J-STD-002 Category 3.
Reflow Condition
(IR/Convection or VPR Reflow)
TP Ramp-up
tp Critical Zone T L to T P
Temperature
TL Tsmax
tL
Tsmin Ramp-down ts Preheat
25
t 25 C to Peak
Tim e
Classificatin Reflow Profiles
Profile Feature Average ramp-up rate (TL to TP) Preheat - Temperature Min (Tsmin) - Temperature Max (Tsmax) - Time (min to max) (ts) Time maintained above: - Temperature (TL) - Time (tL) Peak/Classificatioon Temperature (Tp) Time within 5C of actual Peak Temperature (tp) Ramp-down Rate Sn-Pb Eutectic Assembly 3C/second max. 100C 150C 60-120 seconds 183C 60-150 seconds See table 1 10-30 seconds Pb-Free Assembly 3C/second max. 150C 200C 60-180 seconds 217C 60-150 seconds See table 2 20-40 seconds
6C/second max. 6C/second max. 6 minutes max. 8 minutes max. Time 25C to Peak Temperature Notes: All temperatures refer to topside of the package .Measured on the body surface.
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APW7134
Classificatin Reflow Profiles(Cont.)
Table 1. SnPb Entectic Process - Package Peak Reflow Temperatures 3 3 Package Thickness Volum e m m Volume mm <350 350 <2.5 m m 240 +0/-5C 225 +0/-5C 2.5 m m 225 +0/-5C 225 +0/-5C
Table 2. Pb-free Process - Package Classification Reflow Temperatures 3 3 3 Package Thickness Volume mm Volume mm Volume mm <350 350-2000 >2000 <1.6 m m 260 +0C* 260 +0C* 260 +0C* 1.6 m m - 2.5 m m 260 +0C* 250 +0C* 245 +0C* 2.5 m m 250 +0C* 245 +0C* 245 +0C* *Tolerance: The device manufacturer/supplier shall assure process compatibility up to and including the stated classification temperature (this means Peak reflow temperature +0C. For example 260C+0C) at the rated MSL level.
Reliability test program
Test item SOLDERABILITY HOLT PCT TST ESD Latch-Up Method MIL-STD-883D-2003 MIL-STD-883D-1005.7 JESD-22-B,A102 MIL-STD-883D-1011.9 MIL-STD-883D-3015.7 JESD 78 Description 245C, 5 SEC 1000 Hrs Bias @125C 168 Hrs, 100%RH, 121C -65C~150C, 200 Cycles VHBM > 2KV, VMM > 200V 10ms, 1 tr > 100mA
Customer Service
Anpec Electronics Corp. Head Office : No.6, Dusing 1st Road, SBIP, Hsin-Chu, Taiwan, R.O.C. Tel : 886-3-5642000 Fax : 886-3-5642050 Taipei Branch : 7F, No. 137, Lane 235, Pac Chiao Rd., Hsin Tien City, Taipei Hsien, Taiwan, R. O. C. Tel : 886-2-89191368 Fax : 886-2-89191369
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