LTC1502IS8-3.3 View Datasheet(PDF) - Linear Technology

Part Name

Description

Manufacturer

LTC1502IS8-3.3

Single Cell to 3.3V Regulated Charge Pump DC/DC Converter

Linear Technology 

LTC1502-3.3

PIN FUNCTIONS

C2 (Pin 1): Charge Pump 1 (CP1) Output. This pin also

serves as the input supply for charge pump 2 (CP2). To

ensure proper start-up, the C2 pin must not be externally

loaded. Bypass the C2 pin with a ≥10µF low ESR capacitor

to ground.

C1+ (Pin 2): Charge Pump 1 Flying Capacitor Positive

Terminal.

C1–/SHDN (Pin 3): Charge Pump 1 Flying Capacitor Nega-

tive Terminal and Shutdown Input. Pulling this pin to

ground through a ≈ 100Ω resistor will put the part into

shutdown mode. With a high resistance pull-down FET,

the series resistor may be eliminated. The external pull-

down device must be high impedance for normal opera-

tion (see Applications Information). Peak voltage present

on this pin is approximately equal to VIN.

GND (Pin 4): Ground. Connect to a ground plane for best

performance.

VIN (Pin 5): Input Supply Voltage. Bypass VIN with a ≥10µF

low ESR capacitor to ground.

C3– (Pin 6): Charge Pump 2 (CP2) Flying Capacitor

Negative Terminal.

C3+ (Pin 7): Charge Pump 2 Flying Capacitor Positive

Terminal.

VOUT (Pin 8): 3.3V Regulated Output Voltage. VOUT is

disconnected from VIN during shutdown. Bypass VOUT

with a ≥10µF low ESR capacitor to ground.

BLOCK DIAGRAM

C1

C2

C3

VIN

5

CIN

SHUTDOWN

C1–/SHDN

C1+

32

C2

1

C3–

6

C3+

7

COMP3

U2

CP1

2.5µA

+

0.55V

HIZ1

CLK1/CLK2

400k

VIN

1M

CP2

–

HIZ2

+

COMP2

U4

SHDN

TIMING

CONTROL

OSCEN

U3

C2

VOUT

BIAS

CONTROL

INTERNAL

VCC

COMP1

8

VOUT

COUT

2.1M

1.2M

1.2V

REF

GND

4

1502-3.3 BD

4

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