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TK717xxS
LOW DROPOUT VOLTAGE REGULATOR FEATURES
n Very Good Stability (CL = 0.22 mF is Stable For n n n n n n n n n n n n
Any Type Capacitor withVOUT 1.8 V) Built-in Shunt Circuit of Output to GND. The Stored Energy of the Output Capacitor is Discharged Quickly Wide Operating Voltage Range (1.8 V ~ 14 V) Very Low Dropout Voltage (VDROP = 103 mV at 100 mA) Peak Output Current is 370 mA (0.3 V DROP Point) Very Low Quiescent Current (IQ = 72 uA at IOUT = 0 mA) Good Ripple Rejection Ratio (80 dB at 1 kHz) High Precision Output Voltage ( 1.5 % or 50 mV) Suitable for Very Low Noise Applications Built-in Active High On/Off Control (0.1 mA Max Standby Current) Built-in Short Circuit Protection Built-in Thermal Shutdown Very Small Surface Mount Package (SOT23-5)
APPLICATIONS
n n n n n n
Battery Powered Systems Measurement Systems Mobile Communications Systems Cordless Phone, PHS, GSM, CDMA Industrial Equipment Personal Computers, Barcode Readers
low quiescent current of 72 mA at no load and 0.8 mA with a 50 mA load. The standby current is typically 100 pA. The circuit features very good stability. The ripple rejection is 90 dB at 400 Hz and 80 dB at 1 kHz. Stable operation is achieved with an output capacitor as low as 0.22 mF; a capacitor of any type may be used. (However, the larger the output capacitor is, the better the overall characteristics will be.) The TK717xxS is available in a very small SOT23-5 surface mount package. TK717xxS
VIN GND VOUT
DESCRIPTION
TK717xxS is a low dropout linear regulator with a built-in electronic switch. The internal switch can be controlled by TTL or CMOS logic levels. The device is in the ON state when the control pin is pulled to a logic high level. In the OFF state, the output impedance becomes very low, quickly discharging the output capacitor. An external capacitor can be connected to the noise bypass pin to lower the output noise level to 30 ~ 50 mVRMS. An internal PNP pass transistor is included to achieve a low dropout voltage of 103 mV at 100 mA load current. The TK717xx has an exceptionally
01 S
CONTROL
NOISE BYPASS
ORDERING INFORMATION
BLOCK DIAGRAM
TK717
Voltage Code Package Code
SL
VIN VOUT CONTROL CIRCUIT CONTROL CONSTANT CURRENT SOURCE +
Tape/Reel Code Operating Temp. Range
VOLTAGE CODE
15 = 1.5 V 16 = 1.6 V 17 = 1.7 V 18 = 1.8 V 19 = 1.9 V 20 = 2.0 V 21 = 2.1 V 22 = 2.2 V 23 = 2.3 V 24 = 2.4 V 25 = 2.5 V 26 = 2.6 V 27 = 2.7 V 28 = 2.8 V 29 = 2.9 V 30 = 3.0 V 31 = 3.1 V 32 = 3.2 V 33 = 3.3 V 34 = 3.4 V 35 = 3.5 V 36 = 3.6 V 37 = 3.7 V 38 = 3.8 V 39 = 3.9 V 40 = 4.0 V 41 = 4.1 V 42 = 43 = 44 = 45 = 46 = 47 = 48 = 49 = 50 = 4.2 V 4.3 V 4.4 V 4.5 V 4.6 V 4.7 V 4.8 V 4.9 V 5.0 V
TAPE/REEL CODE L: Tape Left OPERATING TEMP. RANGE C: -30 ~ 80C PACKAGE CODE S: SOT23-5
BANDGAP REFERENCE
THERMAL & OVER CURRENT PROTECTION
AUTO DISCHARGE CIRCUIT
GND
NOISE BYPASS
October 2001 TOKO, Inc.
Page 1
TK717xxS
ABSOLUTE MAXIMUM RATINGS
Supply Voltage ............................................... -0.4 to16 V Power Dissipation (Note 1) ................................. 500 mW Reverse Bias Voltage ..................................... -0.4 to 6 V Operating Voltage Range ............................... 1.8 to 14 V Storage Temperature Range ..................... -55 to +150 C Test conditions: TA = 25 C, unless otherwise specified. Operating Temperature Range ..................... -30 to +80 C Noise Bypass Pin Voltage .............................. -0.4 to 5 V Control Pin Voltage ....................................... -0.4 to 16 V Short Circuit Current ............................................ 410 mA
TK717xxSCL ELECTRICAL CHARACTERISTICS
SYMBOL VOUT Line Reg
PARAMETER Output Voltage Line Regulation
TEST CONDITIONS
MIN
TYP
MAX
UNITS
See Table 1
VIN = VOUT(TYP) + 1 V to VOUT(TYP) + 6 V, D V = 5 V
0.3 8 27 65 103 163 163 280 370 250 72 0.0 0.8 13 23 25 27 29 38 41 44
5 24 61 130 200 300 300
mV mV mV mV mV mV mV mA mA
Load Reg Load Regulation
5 mA < IOUT < 100 mA, Note 2 5 mA < IOUT < 200 mA, Note 2
VDROP
Dropout Voltage (Note 5)
IOUT = 50 mA IOUT = 100 mA IOUT = 200 mA (2.4 V VOUT) IOUT = 180 mA (2.1 V VOUT < 2.4 V)
IOUT (MAX)
Maximum Output Current
When VOUT Down 0.3 V, Note 2 1.8 V VIN 2.1 V, Reference Value
IQ ISTBY IGND Idis
Quiescent Current Standby Current GND Pin Current Discharge Current
IOUT = 0 mA Excluding ICONT VCC = 8 V, VCONT 0.15 V, Off Mode IOUT = 50 mA VREV = 2 V, Off Mode (71720) VREV = 3 V, Off Mode (71730) VREV = 4 V, Off Mode (71740) VREV = 5 V, Off Mode (71750)
110 0.1 1.5
mA mA mA mA mA mA mA
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October 2001 TOKO, Inc.
TK717xxS
TK717xxSCL ELECTRICAL CHARACTERISTICS (CONT.)
Test conditions: TA = 25 C, unless otherwise specified.
SYMBOL
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
CONTROL TERMINAL SPECIFICATIONS (See Note 3 and 4) ICONT VCONT(ON) VCONT(OFF) VREF DVOUT/DT VNO Control Current Control Voltage ON Control Voltage OFF Noise Bypass Terminal Voltage Temperature Coefficient Output Noise Reference Value Reference Value VOUT = 1.8 V On State On Mode Off Mode 1.26 Typ = 25 ppm/C 0.20 mV/ O Hz Typical at 1kHz 1.6 0.6 0.86 2.5 A V V V
Note 1: Power dissipation is 150 mW in free air. Power dissipation is 500 mW when mounted as recommended. Derate at 4.0 mW/C for operation above 25C. Note 2: This value depends on the output voltage. This is a reference value for a 3 V output device. Note 3: The input current decreases to the pA level by connecting the control terminal to GND. Note 4: The pull-down resistor is not built-in. Note 5: The minimum operating voltage for VIN can be 1.8 V. Also, the minimum voltage required for VIN is VIN = VDROP + VOUT. As a result, operating at VOUT 2.0 V at the mimimum input operating voltage is not preferred. General Note: The operation of -30 C to 80 C is guaranteed by design (verified by sample inspection). General Note: Exceeding the "Absolute Maximum Rating "may damage the device. General Note: Output noise is 0.20 mV/ OHz typical at 1 kHz: BW 400 to 30 kHz and 30 ~ 60 m Vrms. General Note: Connecting a capacitor to the noise by pass pin will decrease the output noise voltage.
October 2001 TOKO, Inc.
Page 3
TK717xxS
TK717xxSCL ELECTRICAL CHARACTERISTICS TABLE 1
Test Conditions: VIN = VOUT(TYP) + 1 V, IOUT = 5 mA, TA = 25 C, unless otherwise specified.
OUTPUT VOLTAGE VOLTAGE CODE VOUT MIN 1.5 V 1.6 V 1.7 V 1.8 V 1.9 V 2.0 V 2.1 V 2.2 V 2.3 V 2.4 V 2.5 V 2.6 V 2.7 V 2.8 V 2.9 V 3.0 V 3.1 V 3.2 V 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 1.450 V 1.550 V 1.650 V 1.750 V 1.850 V 1.950 V 2.050 V 2.150 V 2.250 V 2.350 V 2.450 V 2.550 V 2.650 V 2.750 V 2.850 V 2.950 V 3.050 V 3.150 V
VOUT MAX 1.550 V 1.650 V 1.750 V 1.850 V 1.950 V 2.050 V 2.150 V 2.250 V 2.350 V 2.450 V 2.550 V 2.650 V 2.750 V 2.850 V 2.950 V 3.050 V 3.150 V 3.250 V
TEST VOLTAGE 2.5 V 2.6V 2.7 V 2.8 V 2.9 V 3.0 V 3.1 V 3.2 V 3.3 V 3.4 V 3.5 V 3.6 V 3.7 V 3.8 V 3.9 V 4.0 V 4.1 V 4.2 V
OUTPUT VOLTAGE 3.3 V 3.4 V 3.5 V 3.6 V 3.7 V 3.8 V 3.9 V 4.0 V 4.1 V 4.2 V 4.3 V 4.4 V 4.5 V 4.6 V 4.7 V 4.8 V 4.9 V 5.0 V
VOLTAGE CODE VOUT MIN 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 3.250 V 3.349 V 3.447 V 3.546 V 3.644 V 3.743 V 3.841 V 3.940 V 4.038 V 4.137 V 4.235 V 4.334 V 4.432 V 4.531 V 4.629 V 4.728 V 4.826 V 4.925 V
VOUT MAX 3.350 V 3.451 V 3.553 V 3.654 V 3.756 V 3.857 V 3.959 V 4.060 V 4.162 V 4.263 V 4.365 V 4.466 V 4.568 V 4.669 V 4.771 V 4.872 V 4.974 V 5.075 V
TEST VOLTAGE 4.3 V 4.4 V 4.5 V 4.6 V 4.7 V 4.8 V 4.9 V 5.0 V 5.1 V 5.2 V 5.3 V 5.4 V 5.5 V 5.6 V 5.7 V 5.8 V 5.9 V 6.0 V
The output voltage table indicates the standard value when manufactured.
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October 2001 TOKO, Inc.
TK717xxS
TEST CIRCUIT
VIN IIN VOUT CL = 0.22 F GND IOUT
A
VIN
CIN = 0.22 F
V
A
VCONT
V
ICONT
CN = 0.001 F On/Off CONT Noise Bypass (VREF)
TYPICAL PERFORMANCE CHARACTERISTICS
Noise Performance
TK71730S NOISE vs. CN 300 250
CL = CERAMIC CL CL CL CL CL = 0.2 F = 0.4 F = 1.0 F = 2.2 F = 10 F
NOISE vs VOUT 70 70
NOISE (Vrms)
IOUT = 30 mA CN = 0.01F CL = 1.0 F (TANTALUM)
NOISE vs. IOUT 65 60 CN = 0.01 F
CL CL CL CL CL = 0.22 F = 0.47 F = 1.0 F = 2.2 F = 10 F
NOISE (Vrms)
NOISE (Vrms)
200 150 100 50 0 0
CL = TANTALUM
60 50 40 30 20 10
55 50 45 40 35 30 0 25
CL = TANTALUM
IOUT = 30 mA BPF = 400 Hz ~ 80 kHz
BPF = 400 Hz ~ 80 kHz
10
100 1000 10000 100000 CN (pF)
1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 VOUT (V)
50 75 100 125 150 175 200 IOUT (mA)
NOISE vs. IOUT 70 65 60
NOISE (Vrms)
NOISE vs. FREQUENCY 10
TK71730S CIN = 10 F CL = 0.22 F (CERAMIC) IOUT = 10 mA
CN = 0.01 F
CL CL CL CL CL = 0.22 F = 0.47 F = 1.0 F = 2.2 F = 10 F
45 40 35 30 0 25
CL = CERAMIC
V/
50
Hz
55
1
CN = 0.01 F
0.1
CN = 0.10 F
For better noise reduction it is more effective to increase CN without increasing CL. The recommended CN capacitance is 6800 pF or 0.01 mF. As the output voltage increases, the noise will also increase.
0.01 50 75 100 125 150 175 200 IOUT (mA) 0.01 0.1 1 10 FREQUENCY (kHz) 100
October 2001 TOKO, Inc.
Page 5
TK717xxS
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
Ripple Rejection
0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 0.1 1 10 100 FREQUENCY (kHz) 1000
CL = 2.2 F CL = 0.22 F
TANTALUM CAPACITOR
0 -10
MULTILAYER CERAMIC CAPACITOR
Conditions: VIN = 5.0 V VOUT = 3.0 V IOUT = 10 mA VRIPPLE = 500 mVp-p f = 100 Hz TO 1 MHz CIN = 0 pF CN = 0.01 mF
-20
CL = 0.22 F
RR (dB)
RR (dB)
-30 -40 -50 -60 -70 -80 -90
CL = 2.2 F
-100 0.1 1 10 100 FREQUENCY (kHz) 1000
The ripple rejection characteristic depends on the characteristic and the capacitance value of the capacitor connected to the output side. The RR characteristic of 50 kHz or more varies greatly with the capacitor on the output side and the PCB. Please confirm your expectations with your actual design, if necessary.
0 -10 -20 -30
RR (dB)
RIPPLE REJECTION vs. IOUT
CN = 0.01 F CL = 0.22 F (Ceramic) VIN = 5.0 V VRIPPLE = 500 mVp-p
RR AT LOW VOLTAGE 0 -10 -20 -30
RR (dB)
CN = 0.01 F CL = 0.22 F (CERAMIC) IOUT: 1, 50, 100, 150, 200 mA IOUT = 200mA
-40 -50 -60 -70 -80 -90
Freq = 400 Hz Freq = 1 kHz
-40 -50 -60 -70 -80 -90
IOUT = 1mA VIN = VOUT
-100 0 25 50 75 100 125 150 175 200 IOUT (mA)
-100 +0.2 +0.4 +0.6 +0.8 VIN - VOUT _ (TYP) (V) +1
DROP OUT VOLTAGE 0 -50 -100
MAXIMUM OUTPUT CURRENT 5.0 4.0
VDROP (mV)
VOUT (V)
-150 -200 -250
3.0 2.0 1.0
-300 -350 0 50 100 150 200 IOUT (mA) 250 300 0.0 0 100 200 300 IOUT (mA) 400 500
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October 2001 TOKO, Inc.
TK717xxS
DEFINITION AND EXPLANATION OF TECHNICAL TERMS
OUTPUT VOLTAGE (VOUT) The output voltage is specified with VIN = (VOUT(TYP) + 1 V) and IOUT = 5 mA. MAXIMUM OUTPUT CURRENT (IOUT(MAX)) The rated output current is specified under the condition where the output voltage drops 0.3 V below the value specified with IOUT = 5 mA. This input voltage is set to VOUT(TYP) +1 V, and the current is pulsed to minimize temperature effect. DROPOUT VOLTAGE (VDROP) THERMAL SENSOR The dropout voltage is the difference between the input voltage and the output voltage at which point the regulator starts to fall out of regulation. Below this value, the output voltage will fall as the input voltage is reduced. It is dependent upon the load current and the junction temperature. LINE REGULATION (Line Reg) Line regulation is the ability of the regulator to maintain a constant output voltage as the input voltage changes. The line regulation is specified as the input voltage is changed from VIN = VOUT + 1 V to VIN = VOUT + 6 V. LOAD REGULATION (Load Reg) Load regulation is the ability of the regulator to maintain a constant output voltage as the load current changes. It is a pulsed measurement to minimize temperature effects with the input voltage set to VIN = VOUT +1 V. The load regulation is specified under two output current step conditions of 5 mA to 100 mA and 5 mA to 200 mA. QUIESCENT CURRENT (IQ) The quiescent current is the current which flows through the ground terminal under no load conditions (IOUT = 0 mA). RIPPLE REJECTION RATIO (RR) Ripple rejection is the ability of the regulator to attenuate the ripple content of the input voltage at the output. It is specified with 200 mVRMS, 400 Hz and 1 kHz superimposed on the input voltage, where VIN = VOUT + 1.5 V. The output decoupling capacitor is set to 1.0 F, the noise bypass capacitor is set to 0.01 F, and the load current is set to 10
GND
mA. Ripple rejection is the ratio of the ripple content of the output vs. the input and is expressed in dB. STANDBY CURRENT (ISTBY) Standby current is the current which flows into the regulator when the output is turned off by the control function. OVER CURRENT SENSOR The overcurrent sensor protects the device if the output is shorted to ground.
The thermal sensor protects the device if the junction temperature exceeds the safe value (Tj = 150 C). This temperature rise can be caused by extreme heat, excessive power dissipation caused by large output voltage drops, or excessive output current. The regulator will shut off when the temperature exceeds the safe value. As the junction temperature decreases, the regulator will begin to operate again. Under sustained fault conditions, the regulator output will oscillate as the device turns off then resets. Damage may occur to the device under extreme fault conditions. REVERSE VOLTAGE PROTECTION Reverse voltage protection prevents damage due to the output voltage being higher than the input voltage. This fault condition can occur when the output capacitor remains charged and the input is reduced to zero, or when an external voltage higher than the input voltage is applied to the output side. Toko's regulators do not need an inherent diode connected between the input and output.
VIN TK717xxS
VOUT
October 2001 TOKO, Inc.
Page 7
TK717xxS
DEFINITION AND EXPLANATION OF TECHNICAL TERMS (CONT.)
PACKAGE POWER DISSIPATION (PD) This is the power dissipation level at which the thermal sensor is activated. The IC contains an internal thermal sensor which monitors the junction temperature. When the junction temperature exceeds the monitor threshold of 150 C, the IC is shut down. The junction temperature rises as the difference between the input power (VIN x IIN) and the output power (VOUT x IOUT) increases. The rate of temperature rise is greatly affected by the mounting pad configuration on the PCB, the board material, and the ambient temperature. When the IC mounting has good thermal conductivity, the junction temperature will be low even if the power dissipation is great. When mounted on the recommended mounting pad, the power dissipation of the SOT235 is increased to 500 mW. For operation at ambient temperatures over 25 C, the power dissipation of the SOT23-5 device should be derated at 4.0 mW/ C. For operation above 25 C: To determine the power dissipation for shutdown when mounted, attach the device on the actual PCB and deliberately increase the output current (or raise the input voltage) until the thermal protection circuit is activated. Calculate the power dissipation of the device by subtracting the output power from the input power. These measurements should allow for the ambient temperature of the PCB. The value obtained from PD /(150 C - TA) is the derating factor. The PCB mounting pad should provide maximum thermal conductivity in order to maintain low device temperatures. As a general rule, the lower the temperature, the better the reliability of the device. The thermal resistance when mounted is expressed as follows: The range of usable currents can also be found from the graph below.
PD(mW) 3
PD
DPD
6 4 5
25
50
75 TA (C)
150
Procedure: 1) Find PD 2) PD1 is taken to be PD x (~0.8 - 0.9) 3) Plot PD1 against 25 C 4) Connect PD1 to the point corresponding to the 150 C with a straight line. 5) In design, take a vertical line from the maximum operating temperature (e.g., 75 C) to the derating curve. 6) Read off the value of PD against the point at which the vertical line intersects the derating curve. This is taken as the maximum power dissipation, DPD. The maximum operating current is: IOUT = (DPD / (VIN(MAX) - VOUT)
Tj = 0jA x PD + TA For Toko ICs, the internal limit for junction temperature is 150 C. If the ambient temperature (TA) is 25 C, then: 150 C = 0jA x PD + 25 C 0jA = 125 C / PD 0jA = 125 C / PD (C / mW) PD is the value when the thermal protection circuit is activated. A simple way to determine PD is to calculate VIN x IIN when the output side is shorted. Input current gradually falls as temperature rises. You should use the value when thermal equilibrium is reached.
Page 8
October 2001 TOKO, Inc.
TK717xxS
APPLICATION INFORMATION (CONT.)
BOARD LAYOUT
VIN
VOUT
+
TK717xx
+
GND
NOISE BYPASS ON / OFF
SOT23-5 BOARD LAYOUT
PD(mW) 500 -4.0 MW / C Mounted as shown
Free Air
0 0 25 50 (85) 100 150 C
October 2001 TOKO, Inc.
Page 9
TK717xxS
APPLICATION INFORMATION (CONT.)
INPUT-OUTPUT CAPACITORS Linear regulators require input and output capacitors in order to maintain the regulator's loop stability. The equivalent series resistance (ESR) of the output capacitor must be in the stable operation area. However, it is recommended to use as large a value of capacitance as is practical. The output noise and the ripple noise decrease as the capacitance value increases. The IC is never damaged by enlarging the capacitance. ESR values vary widely between ceramic and tantalum capacitors. However, tantalum capacitors are assumed to provide more ESR damping resistance, which provides greater circuit stability. This implies that a higher level of circuit stability can be obtained by using tantalum capacitors when compared to ceramic capacitors with similar values. The IC provides stable operation with an output side capacitor of 0.22 mF (VOUT 2.0 V). If the capacitor is 0.1 mF or more over its full range of temperature, either a ceramic capacitor or tantalum capacitor can be used without considering ESR (VOUT 2.0 V). For output voltage device 2.0 V applications, the recommended value of CL 0.22 mF. For output voltage device 1.5 V applications, the recommended value of CL 0.47 mF. For load current 0.5 mA, increase the output capacitor to 1 mF.
The input capacitor is necessary when the battery is discharged, the power supply impedance increases, or the line distance to the power supply is long. This capacitor might be necessary on each individual IC even if two or more regulator ICs are used. It is not possible to determine this indiscriminately. Please confirm the stability while mounted.
VOUT
CIN = 0.22 F
CL = 0.22 F
CN = 0.01 F
STABLE OPERATION AREA vs. VOLTAGE, CURRENT AND ESR
VOUT = 1.5 V - 1.9 V 100 100 VOUT = 2.0 V 100 VOUT = 3.0 V 100 VOUT = 4.0 V 100 VOUT = 5.0 V
10
10
10
10
10
ESR ( )
ESR ( )
ESR ( )
ESR ( )
1
1
1
1
ESR ( )
STABLE AREA CL = 0.1 F
STABLE AREA CL = 0.1 F
STABLE AREA CL = 0.1 F
STABLE AREA CL = 0.1 F
STABLE AREA CL = 0.1 F
1
0.1
0.1
0.1
0.1
0.1
0 .01 0 50 100 IOUT (mA) All Stable CL 1.0 F 150
0 .01 0 50 100 IOUT (mA) All Stable CL 0.22 F 150
0 .01 0 50 100 IOUT (mA) 150
0 .01 0 50 100 IOUT (mA) 150
0 .01 0 50 100 IOUT (mA) 150
Please increase the output capacitor value when the load current is 0.5 mA or less. The stability of the regulator improves if a big output side capacitor is used (the stable operation area extends). For evaluation
KYOCERA CM05B104K10AB, CM05B224K10AB, CM105B104K16A, CM105B224K16A,CM21B225K10A MURATA GRM36B104K10, GRM42B104K10, GRM39B104K25, GRM39B224K10, GRM39B105K6.3
Page 10
October 2001 TOKO, Inc.
TK717xxS
APPLICATION INFORMATION (CONT.)
Bias Voltage and Temperature Characteristics of Ceramic Capacitors Generally, a ceramic capacitor has both a temperature characteristic and a voltage characteristic. Please consider both characteristics when selecting the part. The B curves are the recommended characteristics.
CAPACITANCE vs BIAS VOLTAGE . 100
CAPACITANCE (%)
CAPACITANCE (%)
CAPACITANCE vs TEMPERATURE . 100 90 80 70 60 50 -50 - 25 0 25 Ta (C) 50 75 100
F CURVE B CURVE
90 80 70 60 50 40 0 2 4
F CURVE
B CURVE
6 8 Bias Voltage (V)
10
October 2001 TOKO, Inc.
Page 11
TK717xxS
APPLICATION INFORMATION (CONT.)
As shown in the figure below, several components are required to discharge the charge in the output side capacitor in a typical regulator.
VIN VOUT
On/Off Control
DISCHARGE CIRCUIT
TK717xxS (TOKO REGULATOR) Doesn't need discharge circuit
Because the external electrical discharge circuit is unnecessary with the TK717xxS, the application becomes very simple. Turning the regulator off automatically discharges the charge of the output side capacitor.
DISCHARGE CURRENT IN OFF MODE
VIN VOUT
On/Off CONTROL
The TK112xxB is a normal regulator. The TK717xx is built with the automatic discharge circuit during off time. The TK716xxS, AS is built with the output disconnect circuit. As shown here:
on off res pons CL = 2.2 F e: CN = 1000 pF I Load = 0mA
CONTROL VOUT
TK716xxS, AS TK112xxB
TK717xx
0
200
400 TIME (S)
600
Page 12
October 2001 TOKO, Inc.
TK717xxS
PACKAGE OUTLINE
Marking Information
Product Code Part Number TK71715 TK71716 TK71717 TK71718 TK71719 TK71720 TK71721 TK71722 TK71723 TK71724 TK71725 TK71726 TK71727 TK71728 TK71729 TK71730 TK71731 TK71732 TK71733 TK71734 TK71735 TK71736 TK71737 TK71738 TK71739 TK71740 TK71741 TK71742 TK71743 TK71744 TK71745 TK71746 TK71747 TK71748 TK71749 TK71750 K Voltage Code 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
SOT23-5
0.7
Marking
e1 2.4
x Voltage Code
x
K Product Code
1.0
5
4
e 0.95
e 0.95 1.90
1
2
3 e 0.4 0.1 Recom mended Mount Pad
e 0.95
e 0.95
0.1
M
2.9 1.6
1.4 max
0.15 0.1 0 - 0.1
2.8 0.3
1.1
0.1
Dimensions are shown in millimeters Tolerance: x.x = 0.2 mm (unless otherwise specified)
Toko America, Inc. Headquarters 1250 Feehanville Drive, Mount Prospect, Illinois 60056 Tel: (847) 297-0070 Fax: (847) 699-7864
TOKO AMERICA REGIONAL OFFICES
Midwest Regional Office Toko America, Inc. 1250 Feehanville Drive Mount Prospect, IL 60056 Tel: (847) 297-0070 Fax: (847) 699-7864 Western Regional Office Toko America, Inc. 2480 North First Street , Suite 260 San Jose, CA 95131 Tel: (408) 432-8281 Fax: (408) 943-9790 Semiconductor Technical Support Toko Design Center 4755 Forge Road Colorado Springs, CO 80907 Tel: (719) 528-2200 Fax: (719) 528-2375
Visit our Internet site at http://www.tokoam.com
The information furnished by TOKO, Inc. is believed to be accurate and reliable. However, TOKO reserves the right to make changes or improvements in the design, specification or manufacture of its products without further notice. TOKO does not assume any liability arising from the application or use of any product or circuit described herein, nor for any infringements of patents or other rights of third parties which may result from the use of its products. No license is granted by implication or otherwise under any patent or patent rights of TOKO, Inc.
October 2001 TOKO, Inc.
(c) 1999 Toko, Inc. All Rights Reserved IC-216-TK716xx 0798O0.0K
0 ~ 15
Page 13
Printed in the USA

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