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LTC1754-3.3/LTC1754-5 Micropower, Regulated 3.3V/5V Charge Pump with Shutdown in SOT-23
FEATURES
s s s s s s s s s s s
DESCRIPTIO
Ultralow Power: IIN = 13A Regulated Output Voltage: 3.3V 4%, 5V 4% 5V Output Current: 50mA (VIN 3.0V) 3.3V Output Current: 40mA (VIN 2.5V) No Inductors Needed Very Low Shutdown Current: <1A Shutdown Disconnects Load from VIN Internal Oscillator: 600kHz Short-Circuit and Overtemperature Protected Ultrasmall Application Circuit: (0.052 Inch2) 6-Pin SOT-23 Package
The LTC(R)1754 is a micropower charge pump DC/DC converter that produces a regulated output. The input voltage range is 2V to 4.4V for 3.3V output and 2.7V to 5.5V for 5V output. Extremely low operating current and a low external parts count (one flying capacitor and two small bypass capacitors at VIN and VOUT) make the LTC1754 ideally suited for small, battery-powered applications. The total component area of the application circuit shown below is only 0.052 inch2. The LTC1754 operates as a Burst ModeTM switched capacitor voltage doubler to produce a regulated output. It has thermal shutdown capability and can survive a continuous short circuit from VOUT to GND. The LTC1754 is available in a 6-pin SOT-23 package.
, LTC and LT are registered trademarks of Linear Technology Corporation. Burst Mode is a trademark of Linear Technology Corporation.
APPLICATIO S
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SIM Interface Supplies for GSM Cellular Telephones White LED Power Supplies Li-Ion Battery Backup Supplies Handheld Computers Smart Card Readers PCMCIA Local 5V Supplies
TYPICAL APPLICATIO
VOUT 10F 1 2 3 VOUT GND C+ VIN 6 5 4 1F LTC1754-X
LTC1754-3.3 Output Voltage vs Supply Voltage
3.40
VIN 10F
OUTPUT VOLTAGE (V)
IOUT = 20mA COUT = 10f CFLY = 1F
1754 TA01
OUTPUT VOLTAGE (V)
ON/OFF
SHDN C -
3.35 TA = 85C 3.30 TA = 25C TA = -40C 3.25
Regulated 3.3V Output from 2V to 4.4V Input
VOUT = 3.3V 4% IOUT = 0mA TO 20mA, VIN > 2.0V IOUT = 0mA TO 40mA, VIN > 2.5V
Regulated 5V Output from 2.7V to 5.5V Input
VOUT = 5V 4% IOUT = 0mA TO 25mA, VIN > 2.7V IOUT = 0mA TO 50mA, VIN > 3.0V
3.20 2.0 2.5 3.5 4.0 3.0 SUPPLY VOLTAGE (V) 4.5
1754 TA02
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LTC1754-5 Output Voltage vs Supply Voltage
5.15 5.10 5.05 5.00 4.95 4.90 4.85 TA = -40C IOUT = 25mA COUT = 10F CFLY = 1F TA = 25C TA = 85C 2.5 3.0 3.5 4.0 4.5 SUPPLY VOLTAGE (V) 5.0 5.5
1574 TA03
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LTC1754-3.3/LTC1754-5
ABSOLUTE
(Note 1)
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RATI GS
PACKAGE/ORDER I FOR ATIO
TOP VIEW VOUT 1 GND 2 SHDN 3 6 C+ 5 VIN 4 C-
VIN to GND .................................................. - 0.3V to 6V VOUT to GND ............................................... - 0.3V to 6V SHDN to GND .............................................. - 0.3V to 6V IOUT (Note 4) ......................................................... 75mA VOUT Short-Circuit Duration ............................ Indefinite Operating Temperature Range (Note 3) ... - 40C to 85C Storage Temperature Range .................. - 65C to 150C Lead Temperature (Soldering, 10 sec)................... 300C
ORDER PART NUMBER LTC1754ES6-3.3 LTC1754ES6-5 S6 PART MARKING LTGK LTLW
S6 PACKAGE 6-LEAD PLASTIC SOT-23 TJMAX = 150C, JA = 230C/ W
Consult factory for Industrial and Military grade parts.
The q denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. CFLY = 1F (Note 2), CIN = 10F, COUT = 10F.
SYMBOL PARAMETER LTC1754-3.3 VIN Input Supply Voltage VOUT Output Voltage ICC VR fOSC tON ISC LTC1754-5 VIN VOUT Operating Supply Current Output Ripple Efficiency Switching Frequency VOUT Turn-On Time Output Short-Circuit Current Input Supply Voltage Output Voltage CONDITIONS
q
ELECTRICAL CHARACTERISTICS
MIN 2.0 3.17 3.17
TYP
MAX 4.4 3.43 3.43 30
UNITS V V V A mVP-P % kHz ms mA
2.0V VIN 4.4V, IOUT 20mA 2.5V VIN 4.4V, IOUT 40mA 2.0V VIN 4.4V, IOUT = 0mA, SHDN = VIN VIN = 2.5V, IOUT = 40mA VIN = 2.0V, IOUT = 20mA Oscillator Free Running VIN = 2.0V, IOUT = 0mA VIN = 2.5V, VOUT = 0V, SHDN = 2.5V
q q q
3.30 3.30 11 23 82 600 0.8 118
q
ICC Operating Supply Current VR Output Ripple Efficiency fOSC Switching Frequency tON VOUT Turn-On Time ISC Output Short-Circuit Current LTC1754-3.3/LTC1754-5 ISHDN Shutdown Supply Current VIH VIL IIH IIL SHDN Input Threshold (High) SHDN Input Threshold (Low) SHDN Input Current (High) SHDN Input Current (Low)
2.7V VIN 5.5V, IOUT 25mA 3.0V VIN 5.5V, IOUT 50mA 2.7V VIN 5.5V, IOUT = 0mA, SHDN = VIN VIN = 3V, IOUT = 50mA VIN = 3V, IOUT = 50mA Oscillator Free Running VIN = 3V, IOUT = 0mA VIN = 3V, VOUT = 0V, SHDN = 3V VIN 3.6V, IOUT = 0mA, VSHDN = 0V 3.6V < VIN, IOUT = 0mA, VSHDN = 0V
q q q
2.7 4.8 4.8
5.0 5.0 13 65 82.7 700 0.4 150 0.01
5.5 5.2 5.2 30
mVP-P % kHz ms mA 1 2.5 0.3 1 1 A A V V A A
q q q q
1.4 -1 -1
SHDN = VIN SHDN = 0V
q q
Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: 0.6F is the minimum required CFLY capacitance for rated output current capability. Depending on the choice of capacitor material, a somewhat higher value of capacitor may be required to attain 0.6F over temperature.
Note 3: The LTC1754ES6-X is guaranteed to meet performance specifications from 0C to 70C. Specifications over the -40C to 85C operating temperature range are assured by design, characterization and correlation with statistical process controls. Note 4: Based on long term current density limitations.
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LTC1754-3.3/LTC1754-5 TYPICAL PERFOR A CE CHARACTERISTICS
Output Voltage vs Output Current
3.40
TA = 25C COUT = 10F CFLY = 1F
SUPPLY CURRENT (A)
SUPPLY CURRENT (A)
OUTPUT VOLTAGE (V)
3.35 VIN = 2.5V 3.30 VIN = 2V 3.25
3.20
0
20
60 80 40 OUTPUT CURRENT (mA)
VOUT Short-Circuit Current vs Supply Voltage
180
VOUT SHORT-CIRCUIT CURRENT (mA)
TA = 25C CFLY = 1F
160
EFFICIENCY (%)
140 120 100 80 60 2.0 2.5 3.0 3.5 4.0 SUPPLY VOLTAGE (V) 4.5
1735 G04
Load Transient Response
IOUT 0mA to 20mA 10mA/DIV VOUT AC COUPLED 20mV/DIV VOUT AC COUPLED 20mV/DIV
VIN = 2V COUT = 10F
50s/DIV
UW
1754 G01
LTC1754-3.3, TA = 25C unless otherwise noted.
No Load Supply Current vs Supply Voltage
20 IOUT = 0A CFLY = 1F VSHDN = VIN
20
Supply Current vs VSHDN
TA = 25C IOUT = 0A
15 VIN = 2.5V 10 VIN = 2V VIN = 4.5V
15
TA = 85C
10
TA = 25C
5
TA = - 40C 5
100 0
2.0
2.5
3.0 3.5 4.0 SUPPLY VOLTAGE (V)
4.5
1754 G02
1
3 4 2 VSHDN CONTROL VOLTAGE (V)
5
1754 G03
Efficiency vs Load Current
100 90 80 70 60 50 40 30 20 10 0 0.001 0.01 0.1 1 10 LOAD CURRENT (mA) 100
1754 G05
TA = 25C VIN = 2V CFLY = 1F
Output Ripple
Start-Up Time
SHDN 1V/DIV
VOUT 1V/DIV
1754 G07
VIN = 2V COUT = 10F IOUT = 20mA
5s/DIV
1754 G08
VIN = 2V COUT = 10F
200s/DIV
1754 G9
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LTC1754-3.3/LTC1754-5 TYPICAL PERFOR A CE CHARACTERISTICS
Output Voltage vs Output Current
5.15 5.10 OUTPUT VOLTAGE (V) 5.05 5.00 VIN = 2.7V 4.95 4.90 4.85 0 20 40 60 80 OUTPUT CURRENT (mA) 100
1574-5 G02
TA = 25C COUT = 10F CFLY = 1F SUPPLY CURRENT (A) VIN = 3V
SUPPLY CURRENT (A)
VOUT Short-Circuit Current vs Supply Voltage
220
VOUT SHORT-CIRCUIT CURRENT (mA)
200 180 160 140 120
TA = 25C CFLY = 1F
EFFICIENCY (%)
100 2.5
3.0
Load Transient Response
IOUT 0mA to 50mA 25mA/DIV VOUT AC COUPLED 20mV/DIV
VOUT AC COUPLED 50mV/DIV
VIN = 3V COUT = 10F
50s/DIV
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LTC1754-5, TA = 25C unless otherwise noted.
No Load Supply Current vs Supply Voltage
20 IOUT = 0A CFLY = 1F VSHDN = VIN 15 25
Supply Current vs VSHDN
TA = 25C IOUT = 0A VIN = 3.3V 15 VIN = 2.7V 10 VIN = 5.5V
TA = 85C
20
TA = 25C 10 TA = -40C
5
5 2.5
3.0
3.5 4.0 4.5 SUPPLY VOLTAGE (V)
5.0
5.5
1754 G11
0
1
2 4 5 3 VSHDN CONTROL VOLTAGE (V)
6
1574 G12
Efficiency vs Load Current
100 VIN = 3V 90 TA = 25C CFLY = 1F 80 70 60 50 40 30 20 10
3.5 4.0 4.5 SUPPLY VOLTAGE (V)
5.0
5.5
1754 G13
0 0.001
0.01
0.1 1 10 LOAD CURRENT (mA)
100
1754-5 G05
Output Ripple
SHDN 5V/DIV
Start-Up Time
VOUT 1V/DIV
1754 G16
VIN = 3V COUT = 10F IOUT = 50mA
5s/DIV
1754 G17
VIN = 3V COUT = 10F
100s/DIV
1754 G18
LTC1754-3.3/LTC1754-5 TYPICAL PERFOR A CE CHARACTERISTICS
LTC1754-3.3. LTC1754-5, TA = 25C unless otherwise noted. Oscillator Frequency vs Supply Voltage
850
OSCILLATOR FREQUENCY (kHz)
Efficiency vs Supply Voltage
100 90 80 TA = 25C CFLY = 1F 800 750 700 650 600 550 500
THRESHOLD VOLTAGE (V)
EFFICIENCY (%)
70 60 50 40 30 2.0 LTC1754-3.3 IOUT = 20mA
LTC1754-5 IOUT = 25mA
2.5
4.5 3.0 3.5 4.0 SUPPLY VOLTAGE (V)
PI FU CTIO S
VOUT (Pin 1): Regulated Output Voltage. For best performance, VOUT should be bypassed with a 6.8F (min) low ESR capacitor as close as possible to the pin. GND (Pin 2): Ground. Should be tied to a ground plane for best performance. SHDN (Pin 3): Active Low Shutdown Input. A low on SHDN disables the LTC1754. SHDN must not be allowed to float. C - (Pin 4): Flying Capacitor Negative Terminal. VIN (Pin 5): Input Supply Voltage. VIN should be bypassed with a 6.8F (min) low ESR capacitor. C + (Pin 6): Flying Capacitor Positive Terminal.
SI PLIFIED BLOCK DIAGRA
VOUT COUT 10F
+
COMP1 CONTROL 2 C- 1
-
VREF SHDN
*CHARGE PUMP SHOWN IN PHASE 1, THE CHARGING PHASE. PHASE 1 IS ALSO THE SHUTDOWN PHASE
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5.0
1754 G19
VSHDN Threshold Voltage vs Supply Voltage
0.95 0.90 TA = -40C 0.85 TA = 25C 0.80 TA = 85C 0.75 0.70 0.65 2.0
TA = 85C
TA = 25C
TA = -40C
5.5
450 2.0
2.5
3.0
3.5 4.0 4.5 SUPPLY VOLTAGE (V)
5.0
5.5
2.5
3.0 3.5 4.0 4.5 SUPPLY VOLTAGE (V)
5.0
5.5
1754 G20
1754 G21
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* 2 1
C+ CFLY 1F VIN CIN 10F
1754 BD
5
LTC1754-3.3/LTC1754-5
APPLICATIO S I FOR ATIO
Operation (Refer To Block Diagram) The LTC1754 uses a switched-capacitor charge pump to boost VIN to a regulated output voltage. Regulation is achieved by sensing the output voltage through an internal resistor divider and enabling the charge pump when the divided output drops below the lower trip point of COMP1. When the charge pump is enabled, a two-phase nonoverlapping clock activates the charge pump switches. The flying capacitor is charged to VIN on phase one of the clock. On phase two of the clock it is stacked in series with VIN and connected to VOUT. This sequence of charging and discharging the flying capacitor continues at a free running frequency of 600kHz (typ). Once the attenuated output voltage reaches the upper trip point of COMP1, the charge pump is disabled. When the charge pump is disabled the LTC1754 draws only 13A from VIN thus providing high efficiency under low load conditions. In shutdown mode all circuitry is turned off and the LTC1754 draws only leakage current from the VIN supply. Furthermore, VOUT is disconnected from VIN. The SHDN pin is a CMOS input with a threshold voltage of approximately 0.8V, but may be driven to a logic level that exceeds VIN. The LTC1754 is in shutdown when a logic low is applied to the SHDN pin. Since the SHDN pin is a high impedance CMOS input, it should never be allowed to float. To ensure that its state is defined, it must always be driven with a valid logic level. Power Efficiency The efficiency () of the LTC1754 is similar to that of a linear regulator with an effective input voltage of twice the actual input voltage. This results because the input current for a voltage doubling charge pump is approximately twice the output current. In an ideal voltage doubling regulator the power efficiency would be given by: VOUT IOUT P V = OUT = = OUT 2VIN PIN VIN 2IOUT At moderate-to-high output power, the switching losses and quiescent current of the LTC1754 are negligible and the expression above is valid. For example, an LTC1754-5 with
( )( ) ( )( )
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VIN = 3V, IOUT = 25mA and VOUT regulating to 5V, has a measured efficiency of 82.7%, which is in close agreement with the theoretical 83.3% calculation. The LTC1754 continues to maintain good efficiency even at fairly light loads because of its inherently low power design. Short-Circuit/Thermal Protection During short-circuit conditions, the LTC1754 will draw between 100mA and 400mA from VIN causing a rise in the junction temperature. On-chip thermal shutdown circuitry disables the charge pump once the junction temperature exceeds approximately 150C and reenables the charge pump once the junction temperature drops back to approximately 140C. The LTC1754 will cycle in and out of thermal shutdown indefinitely without latchup or damage until the short circuit on VOUT is removed. Capacitor Selection The style and value of capacitors used with the LTC1754 determine several important parameters such as output ripple, charge pump strength and turn-on time. To reduce noise and ripple, it is recommended that low ESR (< 0.1) capacitors be used for both CIN and COUT. These capacitors should be either ceramic or tantalum and be 6.8F or greater. Aluminum capacitors are not recommended because of their high ESR. If the source impedance to VIN is very low up to several megahertz, CIN may not be needed. A ceramic capacitor is recommended for the flying capacitor with a value in the range of 1F to 2.2F. Note that a large value flying capacitor (> 2.2F) will increase output ripple unless COUT is also increased. For very low load applications, CFLY may be reduced to 0.01F to 0.047F. This will reduce output ripple at the expense of maximum output current and efficiency. In order to achieve the rated output current it is necessary to have at least 0.6F of capacitance for the flying capacitor. Capacitors of different material lose their capacitance over temperature at different rates. For example, a ceramic capacitor made of X7R material will retain most of its capacitance from - 40C to 85C, whereas a Z5U or Y5V style capacitor will lose considerable capacitance over that
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LTC1754-3.3/LTC1754-5
APPLICATIO S I FOR ATIO
range. The capacitor manufacturer's data sheet should be consulted to determine what style and value of capacitor is needed to ensure 0.6F at all temperatures. Output Ripple Low frequency regulation mode ripple exists due to the hysteresis in the sense comparator and propagation delay in the charge pump control circuit. The amplitude and frequency of this ripple are heavily dependent on the load current, the input voltage and the output capacitor size. For large VIN the ripple voltage can become substantial because the increased strength of the charge pump causes fast edges that may outpace the regulation circuitry. Generally the regulation ripple has a sawtooth shape associated with it. A high frequency ripple component may also be present on the output capacitor due to the charge transfer action of the charge pump. In this case the output can display a voltage pulse during the charging phase. This pulse results from the product of the charging current and the ESR of the output capacitor. It is proportional to the input voltage, the value of the flying capacitor and the ESR of the output capacitor. Typical combined output ripple for the LTC1754-5 with VIN = 3V under maximum load is 65mVP-P using a low ESR 10F output capacitor. A smaller output capacitor and/or larger output current load will result in higher ripple due to higher output voltage slew rates. There are several ways to reduce output voltage ripple. For applications requiring higher VIN or lower peak-to-peak ripple, a larger COUT capacitor (22F or greater) is recommended. A larger capacitor will reduce both the low and high frequency ripple due to the lower charging and discharging slew rates, as well as the lower ESR typically found with higher value (larger case size) capacitors. A low ESR ceramic output capacitor will minimize the high frequency ripple, but will not reduce the low frequency ripple unless a high capacitance value is used. To reduce both the low and high frequency ripple, a reasonable compromise is to use a 10F to 22F tantalum capacitor in parallel with a 1F to 3.3F ceramic capacitor on VOUT. An R-C filter may also be used to reduce high frequency voltage spikes (see Figure 1).
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VOUT LTC1754-X
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+
VOUT 15F TANTALUM 1F CERAMIC
2 VOUT LTC1754-X
+
10F TANTALUM
+
VOUT 10F TANTALUM
1754 F01
Figure 1. Output Ripple Reduction Techniques
In low load or high VIN applications, smaller values for the flying capacitor may be used to reduce output ripple. A smaller flying capacitor (0.01F to 0.47F) delivers less charge per clock cycle to the output capacitor resulting in lower output ripple. However, with a smaller flying capacitor, the maximum available output current will be reduced along with the efficiency. Note that when using a larger output capacitor the turn on time of the device will increase. Inrush Currents During normal operation VIN will experience current transients in the 50mA to 100mA range whenever the charge pump is enabled. However during start-up, inrush currents may approach 250mA. For this reason it is important to minimize the source impedance between the input supply and the VIN pin. Too much source impedance may result in regulation problems or prevent start-up. Ultralow Quiescent Current Regulated Supply The LTC1754 contains an internal resistor divider (refer to the Simplified Block Diagram) that typically draws 1.5A from VOUT. During no-load conditions, this internal load causes a droop rate of only 150mV per second on VOUT with COUT = 10F. Applying a 2Hz to 100Hz, 2% to 5% duty cycle signal to the SHDN pin ensures that the circuit of Figure 2 comes out of shutdown frequently enough to maintain regulation. Since the LTC1754 spends nearly the entire time in shutdown, the no-load quiescent current is approximately (VOUT)(1.5A)/(VIN). The LTC1754 must be out of shutdown for a minimum duration of 200s to allow enough time to sense the output voltage and keep it in regulation. A 2Hz, 2% duty cycle
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LTC1754-3.3/LTC1754-5
APPLICATIO S I FOR ATIO
signal will keep VOUT in regulation under no-load conditions. As the VOUT load current increases, the frequency with which the LTC1754 is taken out of shutdown must also be increased.
VOUT 10F SHDN PIN WAVEFORM 1 2 3 C+ VIN C- 6 5 4 1F VIN 10F
VOUT GND SHDN
LTC1754-X
LOW IQ MODE (2Hz TO 100Hz, 2% TO 5% DUTY CYCLE)
Figure 2. Ultralow Quiescent Current Regulated Supply
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TA = 25C IOUT = 0A 5 CFLY = 1F
SUPPLY CURRENT (A)
4 3 2 1 0 2.0
LTC1754-5
LTC1754-3.3
2.5
3.0 3.5 4.0 4.5 SUPPLY VOLTAGE (V)
5.0
5.5
1754 F03
Figure 3. No-Load Supply Current vs Supply Voltage for the Circuit Shown in Figure 2
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Layout Considerations Due to high switching frequency and high transient currents produced by the LTC1754, careful board layout is necessary. A true ground plane and short connections to all capacitors will improve performance and ensure proper regulation under all conditions. Figure 4 shows the recommended layout configuration
VIN VOUT
1754 F02
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1F 10F GND LTC1754-X SHDN
1754-5 F04
10F
Figure 4. Recommended Layout
Thermal Management For higher input voltages and maximum output current, there can be substaintial power dissipation in the LTC1754. If the junction temperature increases above approximately 150C, the thermal shutdown circuitry will automatically deactivate the output. To reduce the maximum junction temperature, a good thermal connection to the PC board is recommended. Connecting the GND pin (Pin 2) to a ground plane and maintaining a solid ground plane under the device on at least two layers of the PC board can reduce the thermal resistance of the package and PC board system to about 150C/W.
LTC1754-3.3/LTC1754-5
TYPICAL APPLICATIO S
Low Power Battery Backup with Autoswitchover and No Reverse Current
1N4148 VIN 5V 10F
75k
1.2M 4 475k 3 6 10k 5
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3 1F
LTC1521-3.3 2
1
4 5 C- VIN
6 C+ VOUT 1 10F 3 VOUT = 3.3V IOUT 300mA IOUT 20mA BACKUP
+
2-CELL NiCd BATTERY
10F
LTC1754-3.3 SHDN GND 2
7
8 LTC1540
HIGH = BACKUP MODE
175433 TA03
1M
2
1
USB Port to Regulated 5V Power Supply
1F 4 5 3 10F 6 1
LTC1754-5
VOUT 10F 5V 4% 50mA
2
1754 TA06
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LTC1754-3.3/LTC1754-5
TYPICAL APPLICATIO S
5V, 100mA Step-Up Generator from 3V
1F 4 C- VIN 3V 10F 3 5 VIN 6 C+ 1 VOUT 5V 100mA
ON/OFF
3V TO 4.4V Li-Ion BATTERY ON/OFF
VIN 2V 10F
ON/OFF
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VOUT LTC1754-5
SHDN 1F 4 C-
GND
2
6 C+ 1 10F 2
1754 TA07
5
VIN
VOUT LTC1754-5
3
SHDN
GND
Lithium-Ion Battery to 5V White or Blue LED Driver
1F 4 5 10F 3 C- VIN 6 C+ 1 VOUT 10F 2
1754 TA08
100
100
100
LTC1754-5
SHDN
GND
3.3V and 5V Step-Up Generator from 2V
VOUT1 3.3V 1F 4 5 C- VIN 6 C+ 1 VOUT 10F 2 3 5 4 C- VIN 1F 6 C+ 1 VOUT 10F 2
1754 TA09
I3.3 + 2I5 20mA VOUT2 5V 3.3I3.3 + 5I5 VIN(2I3.3 + 4I5)
LTC1754-3.3 3
LTC1754-5
SHDN
GND
SHDN
GND
LTC1754-3.3/LTC1754-5
PACKAGE DESCRIPTION
0.35 - 0.55 (0.014 - 0.022)
NOTE: 1. DIMENSIONS ARE IN MILLIMETERS 2. DIMENSIONS ARE INCLUSIVE OF PLATING 3. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR 4. MOLD FLASH SHALL NOT EXCEED 0.254mm 5. PACKAGE EIAJ REFERENCE IS SC-74A (EIAJ)
Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
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Dimensions in inches (millimeters), unless otherwise noted.
S6 Package 6-Lead Plastic SOT-23
(LTC DWG # 05-08-1634)
2.80 - 3.00 (0.110 - 0.118) (NOTE 3)
2.6 - 3.0 (0.110 - 0.118) 1.50 - 1.75 (0.059 - 0.069)
1.90 (0.074) REF
0.95 (0.037) REF
0.00 - 0.15 (0.00 - 0.006)
0.90 - 1.45 (0.035 - 0.057)
0.09 - 0.20 (0.004 - 0.008) (NOTE 2)
0.35 - 0.50 0.90 - 1.30 (0.014 - 0.020) (0.035 - 0.051) SIX PLACES (NOTE 2) S6 SOT-23 0898
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LTC1754-3.3/LTC1754-5
TYPICAL APPLICATIO
Low Power Battery Backup with Autoswitchover and No Reverse Current
Si4435DY 1F 4 1N4148 VIN 5V 10F 75k 5 C- VIN 6 C+ VOUT LTC1754-5 SHDN GND 2 BAT54C 3 1 10F VOUT = 5V IOUT 50mA
1.43M 4 475k 3 6 10k 5 1M
RELATED PARTS
PART NUMBER LT1054 LTC1144 LTC1262 LTC1514/LTC1515 LTC1516 LTC1517-5/LTC1517-3.3 LTC1522 LT1615 LTC1682 DESCRIPTION High Power Doubler Charge Pump Charge Pump Inverter with Shutdown 12V, 30mA Flash Memory Prog. Supply Buck/Boost Charge Pumps with IQ = 60A Micropower 5V Charge Pump Micropower 5V/3.3V Doubler Charge Pumps Micropower 5V Doubler Charge Pump Step-Up Switching Regulator in SOT-23 Low Noise Doubler Charge Pump COMMENTS Up to 100mA Output, VIN = 3.5V to 15V, SO-8 Package VIN = 2V to 18V, 15V to -15V Supply Regulated 12V 5% Output, IQ = 500A 50mA Output at 3V, 3.3V or 5V; 2V to 10V Input IQ = 12A, Up to 50mA Output, VIN = 2V to 5V IQ = 6A, Up to 20mA Output IQ = 6A, Up to 20mA Output IQ = 20A, VIN = 1.2V to 15V, Up to 34V Output Output Noise = 60VRMS, 2.5V to 5.5V Output
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Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408)432-1900 q FAX: (408) 434-0507 q www.linear-tech.com
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3-CELL NiCd BATTERY 10F 7 8 LTC1540 2 1
1754 TA05
175435f LT/TP 0400 4K * PRINTED IN USA
(c) LINEAR TECHNOLOGY CORPORATION 1999

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