LTC1504CS8-3.3 View Datasheet(PDF) - Linear Technology

Part Name

Description

MFG CO.

LTC1504CS8-3.3

500mA Low Voltage Step-Down Synchronous Switching Regulator

Linear Technology 

LTC1504

PIN FUNCTIONS

during power-up. CSS also compensates the current limit

loop, allowing the LTC1504 to enter and exit current limit

cleanly. See the Applications Information section for more

details.

COMP (Pin 8): External Compensation. An external RC

network should be connected to COMP to compensate the

feedback loop. COMP is connected to the output of the

internal error amplifier.

BLOCK DIAGRAM

SHDN

COMP

SS

TO INTERNAL BLOCKS

SAW

12V

–

PWM

+

VCC

Q1

SW

Q2

ILIM

–+

IMAX

12V

FB

+–

MIN

+–

MAX

+–

+–

VREF

1.265V

40mV

+– 40mV

Figure 3. Block Diagram

FB

(ADJ ONLY)

20.4k

12.6k

SENSE

(–3.3V ONLY)

1504 • BD

TEST CIRCUITS

VCC +

CIN

NC

IMAX

VCC

SHDN

SW

1µF

LTC1504

GND FB/SENSE

SS

COMP

LEXT

VOUT

+

COUT

CIN: AVX TPSE107M016R0125

COUT: SANYO 16CV220GX

LEXT: COILCRAFT D03316-473

0.1µF 7.5k

0.01µF

Figure 1

220pF

1504 • TC01

LTC1504

A

FB/SENSE

–

B

+

VREF

A: TEST VOL, IOL

B: TEST VOH, IOH

Figure 2

COMP

1504 • TC02

5

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