ltc1515cs8-trpbf Linear Technology Corporation, ltc1515cs8-trpbf Datasheet

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ltc1515cs8-trpbf

Manufacturer Part Number
ltc1515cs8-trpbf
Description
Step-up/step-down Switched Capacitor Dc/dc Converters With Reset
Manufacturer
Linear Technology Corporation
Datasheet
APPLICATIONS
FEATURES
TYPICAL
5V 3.3V
ON OFF
RESET
SIM Interface in GSM Cellular Telephones
Smart Card Readers
Local Power Supplies
Portable Equipment
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: 60 A
Very Low Shutdown Current: < 1 A
Shutdown Disconnects Load from V
V
Short-Circuit and Overtemperature Protected
650kHz Switching Frequency
Open-Drain Power-On Reset Output
Available in SO-8 Package
OUT
Programmable 3.3V/5V Power Supply with Power-On Reset
Programmable to 3V/5V or 3.3V/5V
1
2
3
4
APPLICATION
SHDN
POR
5/3
GND
LTC1515-3.3/5
U
Daisy-Chained Control Outputs
100k
V
OUT
C1
C1
V
IN
+
8
7
6
5
U
0.22 F
+
IN
10 F
+
V
I
OUT
OUT
10 F
= 50mA
= 3.3V OR 5V
LTC1515 • TA01
Switched Capacitor DC/DC
V
4-CELL
NiCd
IN
The LTC
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
inrush current and output voltage ripple when large V
V
An internal power-on reset circuit forces the POR pin low
on initial power-up. The POR output remains low until
200ms (typ) after V
The parts are short-circuit and overtemperature protected.
Battery life is maximized by very low operating currents
(I
available in an SO-8 package.
DESCRIPTION
OUT
4% regulation. Additional circuitry prevents excessive
CC
, LTC and LT are registered trademarks of Linear Technology Corporation.
= 60 A typ, I
differentials are present.
®
1515, LTC1515-3/5 and LTC1515-3.3/5 are
Converters with Reset
Step-Up/Step-Down
CC
5.2
5.1
5.0
4.9
4.8
LTC1515-X 5V Output vs Input Voltage
2
< 1 A in shutdown). All three parts are
OUT
U
I
5/3 = 3V
OUT
3
= 10mA
is in regulation.
4
INPUT VOLTAGE (V)
5
LTC1515 Series
6
7
8
LT1515 • TA02
9
10
IN
1
to

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ltc1515cs8-trpbf Summary of contents

Page 1

... The POR output remains low until 200ms (typ) after V The parts are short-circuit and overtemperature protected. Battery life is maximized by very low operating currents ( typ available in an SO-8 package. , LTC and LT are registered trademarks of Linear Technology Corporation 3. OUT I = 50mA OUT + ...

Page 2

... SHDN = 0V, V > Full Load (Note 2) Full Load 5/3, SHDN = V IN 5/3, SHDN = 1.232V I = 100 SINK IN ORDER PART NUMBER TOP VIEW LTC1515CS8-3 OUT LTC1515CS8-3.3 LTC1515IS8-3 LTC1515IS8-3.3/5 – PART MARKING 151535 = 110 C/W 515335 JA MIN TYP MAX 2 ...

Page 3

ELECTRICAL CHARACTERISTICS 10V, SHDN = 3V 0. PARAMETER POR Leakage Current POR Trip Point (With Respect OUT POR Trip Point Hysteresis I Short-Circuit Current OUT t ON POR ...

Page 4

LTC1515 Series W U TYPICAL PERFORMANCE CHARACTERISTICS LTC1515-X 3V Efficiency vs Input Voltage 100 OUT I = 10mA OUT INPUT VOLTAGE (V) ...

Page 5

PIN FUNCTIONS + C1 (Pin 6): Charge Pump Flying Capacitor, Positive Terminal. V (Pin 7): Charge Pump Input Voltage. May be between IN 2V and 10V. V should be bypassed with a IN ESR capacitor as close ...

Page 6

LTC1515 Series U U 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 ...

Page 7

... 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 represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. ...

Page 8

... SO8 0996 50mA OUT 2V 50mA (V 3V) IN OUT IN = 20mA OUT 1515f LT/TP 0298 4K • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 1997 = 5V = 20mA < 1mV P-P LTC1515 • TA03 ...

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