LTC1502CS8-3.3 datasheet(4/8 Pages) LINER

4 / 8 page

LTC1502-3.3

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.

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.

BLOCK DIAGRAM

TIMING

CONTROL

BIAS

CONTROL

1.2V

REF

CP2

CP1

SHDN

OSCEN

INTERNAL

VCC

CLK1/CLK2

VOUT

HIZ2

HIZ1

1.2M

2.1M

COUT

COMP2

COMP3

COMP1

400k

0.55V

2.5

µA

C1–/SHDN

SHUTDOWN

C1+

C3–

C3+

VIN

VOUT

VIN

GND

1502-3.3 BD

CIN

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