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LTC1515 Series Step-Up/Step-Down Switched Capacitor DC/DC Converters with Reset
FEATURES
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DESCRIPTION
The LTC(R)1515, LTC1515-3/5 and LTC1515-3.3/5 are micropower switched capacitor DC/DC converters that produce a regulated output voltage by either stepping up or stepping down the input voltage. Output voltage is adjustable using an external resistor divider (LTC1515) or programmable to either 3V/5V (LTC1515-3/5) or 3.3V/5V (LTC1515-3.3/5) using a logic pin. A unique architecture allows the parts to accommodate a wide input voltage range (2V to 10V) while maintaining 4% regulation. Additional circuitry prevents excessive inrush current and output voltage ripple when large VIN to VOUT differentials are present. An internal power-on reset circuit forces the POR pin low on initial power-up. The POR output remains low until 200ms (typ) after VOUT is in regulation. The parts are short-circuit and overtemperature protected. Battery life is maximized by very low operating currents (ICC = 60A typ, ICC < 1A in shutdown). All three parts are available in an SO-8 package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Adjustable/Selectable 3V, 3.3V or 5V Output Voltages 2V to 10V Input Voltage Range Up to 50mA Output Current Only Three External Capacitors Required Soft Start Limits Inrush Current at Turn-On Low Operating Current: 60A Very Low Shutdown Current: < 1A Shutdown Disconnects Load from VIN VOUT Programmable to 3V/5V or 3.3V/5V Short-Circuit and Overtemperature Protected 650kHz Switching Frequency Open-Drain Power-On Reset Output Daisy-Chained Control Outputs Available in SO-8 Package
APPLICATIONS
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SIM Interface in GSM Cellular Telephones Smart Card Readers Local Power Supplies Portable Equipment
TYPICAL APPLICATION
Programmable 3.3V/5V Power Supply with Power-On Reset
100k
LTC1515-X 5V Output vs Input Voltage
5.2 IOUT = 10mA 5/3 = 3V OUTPUT VOLTAGE (V)
ON OFF RESET 5V 3.3V
1 2
SHDN
VOUT
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VOUT = 3.3V OR 5V IOUT = 50mA
5.1
7 POR VIN LTC1515-3.3/5 3 6 5/3 C1+ 4 GND C1- 5 0.22F
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10F
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10F
VIN 4-CELL NiCd
5.0
4.9
LTC1515 * TA01
4.8
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4
5 8 6 7 INPUT VOLTAGE (V)
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10
LT1515 * TA02
1
LTC1515 Series ABSOLUTE MAXIMUM RATINGS
(Note 1)
VIN to GND ................................................ - 0.3V to 12V VOUT to GND ............................................. - 0.3V to 12V SHDN, 5/3, FB to GND .............................. - 0.3V to 12V VOUT Short-Circuit Duration ............................. Indefinite
PACKAGE/ORDER I FOR ATIO
TOP VIEW SHDN 1 POR 2 FB 3 GND 4 8 7 6 5 VOUT VIN C1 + C1 -
ORDER PART NUMBER
SHDN 1
LTC1515CS8 LTC1515IS8 S8 PART MARKING 1515 1515I
S8 PACKAGE 8-LEAD PLASTIC SO TJMAX = 125C, JA = 110C/W
Consult factory for Military grade parts.
ELECTRICAL CHARACTERISTICS
VIN = 2V to 10V, SHDN = 3V, C1 = 0.22F, CIN = COUT = 10F unless otherwise noted (Note 2).
PARAMETER VIN Operating Voltage CONDITIONS VOUT = 5V VOUT = 3V/3.3V VOUT = ADJ 2V VIN 8V, IOUT 15mA 3V VIN 8V, IOUT 50mA 2V VIN 8V, IOUT 15mA 3V VIN 8V, IOUT 50mA 2.7V VIN 10V, IOUT 15mA 3.3V VIN 10V, IOUT 50mA LTC1515, VFB Ramping Negative LTC1515 LTC1515, VIN = 3V, Step-Up Mode VIN 5V, IOUT = 0, SHDN = 3V VIN > 5V, IOUT = 0, SHDN = 3V SHDN = 0V, VIN 5V SHDN = 0V, VIN > 5V Full Load (Note 2) Full Load VIL VIH 5/3, SHDN = VIN 5/3, SHDN = 0V FB = 1.232V ISINK = 100A, VIN = 3V
q q q q q q q q q q q q q q q q q q q q q
VOUT = 3V (LTC1515-3/5) VOUT = 3.3V (LTC1515-3.3/5) VOUT = 5V (LTC1515-3/5, LTC1515-3.3/5) VFB Feedback Voltage VFB Feedback Hysteresis Effective Output Resistance VIN Operating Current VIN Shutdown Current Output Ripple Switching Frequency 5/3, SHDN Input Threshold 5/3, SHDN Input Current FB Input Current POR Output Low Voltage
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Operating Temperature Range Commercial ............................................. 0C to 70C Industrial ............................................ - 40C to 85C Storage Temperature Range ................ - 65C to 150C Lead Temperature (Soldering, 10 sec)................. 300C
TOP VIEW 8 7 6 5 VOUT VIN C1 + C1 -
POR 2 5/3 3 GND 4
ORDER PART NUMBER LTC1515CS8-3/5 LTC1515CS8-3.3/5 LTC1515IS8-3/5 LTC1515IS8-3.3/5 S8 PART MARKING 151535 515335 515I35 15I335
S8 PACKAGE 8-LEAD PLASTIC SO TJMAX = 125C, JA = 110C/W
MIN 2.7 2.0 2.0 2.88 2.88 3.17 3.17 4.8 4.8 1.190
TYP
MAX 10 8 10
UNITS V V V V V V V V V V % A A A A mVP-P kHz V V A A nA V
3.0 3.0 3.3 3.3 5.0 5.0 1.232 1
3.12 3.12 3.43 3.43 5.2 5.2 1.275 30
60 75
100 135 1 25
100 500 0.4 -1 -1 - 50 0.05 650 1.0 1.0 800 1.6 1 1 50 0.4
LTC1515 Series
ELECTRICAL CHARACTERISTICS
VIN = 2V to 10V, SHDN = 3V, C1 = 0.22F, CIN = COUT = 10F unless otherwise noted (Note 2).
PARAMETER POR Leakage Current POR Trip Point (With Respect to VOUT) POR Trip Point Hysteresis IOUT Short-Circuit Current tON POR Delay VOUT = 0V Soft Start Turn-On Time After VOUT Above POR Threshold
q q
CONDITIONS VPOR = 5V VOUT Ramping Negative
q q
MIN -1 - 10
TYP - 7.5 1 12 4
MAX 1 -5 40 280
UNITS A % % mA ms ms
140
200
The q denotes specifications which apply over the full operating temperature range. Note 1: Absolute Maximum Ratings are those values beyond which the life of the device may be impaired.
Note 2: For VIN 8V, COUT = 22F.
TYPICAL PERFORMANCE CHARACTERISTICS
LTC1515-X 3.3V Efficiency vs Output Current
100 VOUT = 3.3V TA = 25C 80 VIN = 2V
EFFICIENCY (%)
80 VIN = 3.3V 60 VIN = 8V
OUTPUT VOLTAGE RIPPLE (mVP-P)
VIN = 4.4V
EFFICIENCY (%)
60
VIN = 2.7V VIN = 6V
40
20
0 0.01
0.1 1 10 OUTPUT CURRENT (mA)
LTC1515-X 5V Output Voltage Ripple vs Input Voltage
250
OUTPUT VOLTAGE RIPPLE (mVP-P)
3.45
COUT = 10F 150 COUT = 22F 100 COUT = 47F
OPERATING CURRENT (A)
200
VOUT = 5V IOUT = 10mA TA = 25C
OUTPUT VOLTAGE (V)
50
0 0 2 6 4 INPUT VOLTAGE (V) 8 10
1515 G04
UW
100
1515 G01
LTC1515-X 5V Efficiency vs Output Current
100 VIN = 2.7V VIN = 6V
LTC1515-X 3.3V Output Voltage Ripple vs Input Voltage
250 VOUT = 3.3V IOUT = 10mA TA = 25C
200
150 COUT = 10F 100 COUT = 22F
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20 VOUT = 5V TA = 25C 0 0.01 0.1 1 10 OUTPUT CURRENT (mA) 100
1515 G02
50
COUT = 47F
0 0 2 6 4 INPUT VOLTAGE (V) 8 10
1515 G03
LTC1515-X 3.3V Output Voltage vs Input Voltage
120
VOUT = 3.3V IOUT = 10mA COUT = 10F TA = 25C
LTC1515-X Operating Current vs Input Voltage
VOUT = 5V IOUT = 0mA 100
3.40
3.35
80 25C 60 85C -40C
3.30
3.25
40
3.20 0 2 6 4 INPUT VOLTAGE (V) 8 10
1515 G05
20 0 2 6 4 INPUT VOLTAGE (V) 8 10
1515 G06
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LTC1515 Series TYPICAL PERFORMANCE CHARACTERISTICS
LTC1515-X 3V Efficiency vs Input Voltage
100 VOUT = 3V IOUT = 10mA TA = 25C
80 100 VOUT = 3.3V IOUT = 10mA TA = 25C
80
EFFICIENCY (%)
60
EFFICIENCY (%)
EFFICIENCY (%)
40
20
0
2
6 4 INPUT VOLTAGE (V)
LTC1515-X Shutdown Supply Current vs Input Voltage
25 SHDN = 0V
POSITIVE SUPPLY CURRENT (A)
20
15 85C 25C 5 -40C
10
0 0 2 6 4 INPUT VOLTAGE (V) 8 10
1515 G12
PIN FUNCTIONS
SHDN (Pin 1): Shutdown Input. A logic low on the SHDN pin puts the part into shutdown mode. A logic high (VSHDN 1.6V) enables the part. At high VIN voltages, the SHDN pin may still be controlled with 3V logic without causing a large rise in VIN quiescent current. The SHDN pin may not float; connect to VIN if unused. POR (Pin 2): Open-Drain Power-On Reset Output. This pin will pull low upon initial power-up, during shutdown or until VOUT has been within 6.5% of its regulated value for more than 200ms typ. 5/3 (LTC1515-X) (Pin 3): Output Voltage Select. A logic high on the 5/3 pin will force VOUT to regulate to 5V. A logic low will force VOUT to 3V (LTC1515-3/5) or 3.3V (LTC15153.3/5). As with the SHDN pin, the 5/3 pin may be driven with 3V logic over the entire VIN range. The 5/3 pin may not float. FB (LTC1515) (Pin 3): Feedback Input. The voltage on this pin is compared to the internal reference voltage (1.232V) to keep the output in regulation. An external resistor divider is required between VOUT and FB to adjust the output voltage. Total divider resistance should not exceed 2M. GND (Pin 4): Ground. Should be tied to a ground plane for best performance. C1- (Pin 5): Charge Pump Flying Capacitor, Negative Terminal.
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8 10
1515 G09
LTC1515-X 3.3V Efficiency vs Input Voltage
100
LTC1515-X 5V Efficiency vs Input Voltage
VOUT = 5V IOUT = 10mA TA = 25C 80
60
60
40
40
20
0
2
6 4 INPUT VOLTAGE (V)
8
10
1515 G07
20
2
4
8 6 INPUT VOLTAGE (V)
10
12
1515 G08
LTC1515-X Step-Down Mode 5V Load Transient Response
LTC1515-X Step-Up Mode 5V Load Transient Response
VOUT AC COUPLED 100mV/DIV
VOUT AC COUPLED 100mV/DIV
IOUT 50mA/DIV
50mA 0mA
IOUT 50mA/DIV
VIN = 8V, VOUT = 5V, COUT = 10F, TA = 25C
1515 G10
VIN = 3.3V, VOUT = 5V, COUT = 10F, TA = 25C
1515 G11
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LTC1515 Series
PIN FUNCTIONS
C1+ (Pin 6): Charge Pump Flying Capacitor, Positive Terminal. VIN (Pin 7): Charge Pump Input Voltage. May be between 2V and 10V. VIN should be bypassed with a 10F low ESR capacitor as close as possible to the pin for best performance. VOUT (Pin 8): Regulated Output Voltage. Pin selectable to either 3V/5V, 3.3V/5V or adjustable using an external resistor divider (LTC1515). VOUT should be bypassed with a 10F low ESR capacitor as close as possible to the pin for best performance.
SI PLIFIED BLOCK DIGRAM
VIN
SHDN
650kHz OSCILLATOR
POR RESET COUNTER EN
APPLICATIONS INFORMATION
Regulator Operation The regulator section of the LTC1515, LTC1515-3/5 and LTC1515-3.3/5 consists of a charge pump, reference, comparator and some logic. The divided down output voltage is compared to the internal reference voltage. When the divided output drops below the reference voltage, the charge pump is enabled, which boosts the output back into regulation. Hysteresis in the comparator forces the regulator to burst on and off and causes approximately 100mV of peak-to-peak ripple to appear at the output. By enabling the charge pump only when needed, the parts achieve high efficiencies with low output load currents. Each part's charge pump has a unique architecture that allows the input voltage to be either stepped up or stepped down to produce a regulated output. Internal circuitry senses the VIN to VOUT differential voltage and controls the charge pump operating mode. In addition, the effective output impedance of the charge pump is internally adjusted to prevent large inrush currents and allow for a wide input voltage range. When the input voltage is lower than the output voltage, the charge pump operates as a step-up voltage doubler. When the input voltage is greater than the output, the charge pump operates as a step-down gated switch.
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C1-
C1+
STEP-UP/STEP-DOWN CHARGE PUMP
VOUT (LTC1515-X)
(LTC1515-X)
-
EN
+
FB (LTC1515) VOS
- +
1.232V VREF
5/3 (LTC1515-X)
GND
LTC1515 * BD
5
LTC1515 Series
APPLICATIONS INFORMATION
Output Voltage Selection The LTC1515-X versions have internal resistor networks which set the output voltage. The 5/3 pin controls an internal switch that shorts out a portion of the resistor network to change the output voltage. A logic high on this pin produces a 5V output and a low produces either a 3V output or a 3.3V output. The output voltage of the LTC1515 is selected using an external resistor divider (see Figure 1). The output voltage is determined using the following formula: VOUT = (1.232V)[1 + (R1/R2)] The total resistance of R1 and R2 should not exceed 2M, otherwise excess ripple may appear at VOUT.
1 R1 2 3 R2 4 GND C1- 5 SHDN POR LTC1515 FB VOUT VIN C1+ 8 7 6
OUTPUT RESISTANCE ()
LTC1515 * F01
Figure 1. LTC1515 Output Voltage Selection
Maximum VOUT and IOUT Calculations for the LTC1515 The maximum output voltage and current available with the LTC1515 can be calculated based on the effective output resistance of the charge pump and the open circuit output voltage. In step-up mode, the open circuit output voltage is approximately 2VIN (see Figure 2). In step-down mode, the open circuit output voltage equals VIN. The relationship between ROUT and VIN in step-up mode is shown in Figure 3. The following formulas can be used to find the maximum output voltage that may be programmed using the LTC1515 for a given minimum input voltage and output current load. Step-Up Mode: Max VOUT = (2)(Min VIN) - (IOUT)(ROUT) Step-Down Mode: Max VOUT = (Min VIN) - (IOUT)(ROUT) When VIN - (IOUT)(ROUT) is less than the programmed VOUT, the part will automatically switch from step-down mode to step-up mode. In both step-up mode and step-
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ROUT
+ -
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2VIN VOUT
-
COUT
IOUT
LT1515 * F02
Figure 2. Step-Up Mode Equivalent Circuit
40
30 IOUT = 20mA 20 IOUT = 50mA
10
0
1
2
3 INPUT VOLTAGE (V)
4
5
LT1515 * F03
Figure 3. Step-Up Mode ROUT vs Input Voltage
down mode, ROUT is internally adjusted to ensure that the maximum output current rating can be met. Capacitor Selection For best performance, low ESR capacitors are recommended for both CIN and COUT to reduce noise and ripple. The CIN and COUT capacitors should be either ceramic or tantalum and should be 10F or greater. If the input source impedance is very low (< 0.5) CIN may not be needed. Increasing the size of COUT to 22F or greater will reduce output voltage ripple -- particularly with high VIN voltages (8V or greater). A ceramic capacitor is recommended for the flying capacitor C1 with a value of 0.1F or 0.22F. Smaller values may be used in low output current applications. Output Ripple Normal LTC1515 series operation produces voltage ripple on the VOUT pin. Output voltage ripple is required for the parts to regulate. Low frequency ripple exists due to the hysteresis in the sense comparator and propagation delays in the charge pump enable/disable circuits. High frequency ripple is also present mainly from the ESR
LTC1515 Series
APPLICATIONS INFORMATION
(equivalent series resistance) in the output capacitor. Typical output ripple (VIN < 8V) under maximum load is 100mV peak-to-peak with a low ESR, 10F output capacitor. For applications requiring VIN to exceed 8V, a 22F or larger COUT capacitor is recommended to maintain maximum ripple in the 100mV range. The magnitude of the ripple voltage depends on several factors. High input voltages increase the output ripple since more charge is delivered to COUT per charging cycle. A large C1 flying capacitor (> 0.22F) also increases ripple in step-up mode for the same reason. Large output current load and/or a small output capacitor (<10F) results in higher ripple due to higher output voltage dV/dt. High ESR capacitors (ESR > 0.5) on the output pin cause high frequency voltage spikes on VOUT with every clock cycle. There are several ways to reduce the output voltage ripple. A large COUT capacitor (22F or greater) will reduce both the low and high frequency ripple due to the lower COUT charging and discharging dV/dt and the lower ESR typically found with higher value (larger case size) capacitors. A low ESR (<0.5) ceramic output capacitor will minimize the high frequency ripple, but will not reduce the low frequency ripple unless a high capacitance value is chosen. A reasonable compromise is to use a 10F to 22F tantalum capacitor in parallel with a 1F to 3.3F ceramic capacitor on VOUT to reduce both the low and high frequency ripple. An RC or LC filter may also be used to reduce high frequency voltage spikes (see Figure 4).
LTC1515/ LTC1515-X VOUT 8 VOUT 15F TANTALUM 1F CERAMIC
+
LTC1515/ LTC1515-X VOUT 8 2 VOUT 10F TANTALUM
LT1515 * F04
+
10F TANTALUM
+
Figure 4. Output Ripple Reduction Techniques
Inrush Currents A common problem with switched capacitor regulators is inrush current--particularly during power-up and com-
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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ing out of shutdown mode. Whenever large VIN (or boosted VIN) to VOUT voltage differentials are present, most charge pumps will pull large current spikes from the input supply. Only the effective charge pump output impedance limits the current while the charge pump is enabled. This may disrupt input supply regulation, especially if the input supply is a low power DC/DC converter or linear regulator. The LTC1515 family minimizes inrush currents both at start-up and under high VIN to VOUT operation. Internal soft start circuitry controls the rate at which VOUT may be charged from 0V to its final regulated value. The typical start-up time from VOUT = 0V to 5V is 4ms. This corresponds to an effective VOUT charging current of only 12.5mA for a 10F output capacitor (27.5mA for 22F, etc.). Note that any output current load present during start-up will add directly to the charging currents mentioned above. The soft start circuitry limits start-up current both at initial power-up and when coming out of shutdown. As the VIN (or boosted VIN) to VOUT voltage differential grows, the effective output impedance of the charge pump is automatically increased by internal voltage sensing circuitry. This feature minimizes the current spikes pulled from VIN whenever the charge pump is enabled and helps to reduce both input and output ripple. Power-On Reset The POR pin is an open-drain output that pulls low when the output voltage is out of regulation. When the VOUT rises to within 6.5% of regulation, an internal timer is started which releases POR after 200ms (typ). In shutdown, the POR output is pulled low. In normal operation, an external pull-up resistor is generally used between the POR pin and VOUT. Protection Features All of the parts contain thermal shutdown and shortcircuit protection features. The parts will shut down when the junction temperature reaches approximately 150C and will resume operation once the junction temperature has dropped back to approximately 140C. The parts will limit output current to 12mA (typ) when a short circuit condition (VOUT < 100mV) exists. The parts can survive an indefinite short to GND.
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LTC1515 Series
TYPICAL APPLICATIONS
Low Power, Low Noise Step-Up/Step-Down 5V Supply with Reset
1.4M ON OFF RESET 470k 1 2 3 402k 4 8 7 6 5 0.22F 8 IN LT1121-5 1 OUT GND 3 ON OFF NC 5V 3V 1 2 3 SHDN VOUT 8 7 POR VIN LTC1515-3/5 6 5/3 C1+ 4 5 C1- GND VOUT = 3V OR 5V IOUT = 15mA 5.5V SHDN POR FB GND LTC1515 VOUT VIN C1+ C1-
Programmable 3V/5V GSM SIM Card Power Supply
0.1F
LTC1515 * TA04
ON OFF NC VIN
* CENTRAL SEMICONDUCTOR CMPSH-35 DUAL SCHOTTKY ** OPTIONAL CIRCUITRY FOR MAINTAINING -VOUT WITH LOW VOUT LOADS Q1, Q2: 2N3904
PACKAGE DESCRIPTION
Dimensions in inches (millimeters) unless otherwise noted.
S8 Package 8-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
0.010 - 0.020 x 45 (0.254 - 0.508) 0.008 - 0.010 (0.203 - 0.254) 0.053 - 0.069 (1.346 - 1.752) 0- 8 TYP 8 0.004 - 0.010 (0.101 - 0.254) 0.228 - 0.244 (5.791 - 6.197)
0.016 - 0.050 0.406 - 1.270
0.014 - 0.019 (0.355 - 0.483)
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE **DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
0.050 (1.270) TYP
RELATED PARTS
PART NUMBER LTC1514 Series LTC1516 LTC1517-5 LTC1522 LTC1555/LTC1556 LTC660 DESCRIPTION Step-Up/Step-Down Switched Capacitor DC/DC Converters Micropower, Regulated 5V Charge Pump DC/DC Converter Micropower, Regulated 5V Charge Pump DC/DC Converter Micropower, Regulated 5V Charge Pump DC/DC Converter SIM Power Supply and Level Translators 100mA CMOS Voltage Converter COMMENTS VIN 2V to 10V, 3.3V and 5V Versions, IOUT to 50mA IOUT = 20mA (VIN 2V), IOUT = 50mA (VIN 3V) LTC1522 Without Shutdown and Packaged in SOT-23 Available in 8-Pin MSOP, 6A Quiescent Current, IOUT = 20mA Step-Up/Step-Down SIM Power Supply and Level Translators 5V to - 5V Conversion with Low Voltage Loss
1515f LT/TP 0298 4K * PRINTED IN USA
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Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417q (408)432-1900 FAX: (408) 434-0507q TELEX: 499-3977 q www.linear-tech.com
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10F
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22F 2
VIN = 3V TO 10V
+
10F VOUT = 5V IOUT = 20mA VRIPPLE < 1mVP-P
LTC1515 * TA03
+
10F
+
10F
+
10F
Li-Ion
Positive and Negative Supply
1 2 3 SHDN VOUT 8 7 POR VIN LTC1515-3/5 6 5/3 C1+ 4 5 GND C1- VOUT = 5V IOUT = 15mA, 2.7V VIN 4.4V IOUT = 50mA, 3.3V VIN 4.4V 10F 470 8.2k Q2 2.4k * ** 10F VOUT = -1V TO -3.5V IOUT = 5mA
LTC1515 * TA05
+
0.22F 10F
+
VIN = 2.7V TO 4.4V
Q1 0.22F
0.189 - 0.197* (4.801 - 5.004) 7 6 5
0.150 - 0.157** (3.810 - 3.988)
1
2
3
4
SO8 0996
(c) LINEAR TECHNOLOGY CORPORATION 1997

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