LT1610 Просмотр технического описания (PDF) - Linear Technology

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LT1610

1.7MHz, Single Cell Micropower DC/DC Converter

Linear Technology 

LT1610

PIN FUNCTIONS

VC (Pin 1): Error Amplifier Output. Frequency compensa-

tion network must be connected to this pin, either internal

(COMP pin) or external series RC to ground. 220kΩ/

220pF typical value.

FB (Pin 2): Feedback Pin. Reference voltage is 1.23V.

Connect resistive divider tap here. Minimize trace area at

FB. Set VOUT according to VOUT = 1.23V (1 + R1/R2).

SHDN (Pin 3): Shutdown. Ground this pin to turn off

device. Tie to 1V or more to enable.

PGND (Pin 4): Power Ground. Tie directly to local ground

plane.

SW (Pin 5): Switch Pin. Connect inductor/diode here.

Minimize trace area at this pin to keep EMI down.

VIN (Pin 6): Input Supply Pin. Must be locally bypassed.

GND (Pin 7): Signal Ground. Carries all device ground

current except switch current. Tie to local ground plane.

COMP (Pin 8): Internal Compensation Network. Tie to VC

pin, or let float if external compensation is used. Output

capacitor must be tantalum if COMP pin is used for com-

pensation.

BLOCK DIAGRA

VOUT

VIN

6

R5

40k

R1

(EXTERNAL)

FB Q1

FB 2

R2

(EXTERNAL)

VIN

R6

40k

+

A1

gm

–

Q2

× 10

R3

30k

R4

140k

1 VC

8 COMP

RC

CC

+

BIAS

–

SHUTDOWN

3 SHDN

7 GND

ENABLE

– COMPARATOR

RAMP

GENERATOR

Σ

A2

+

FF

R

Q

S

5 SW

DRIVER

Q3

1.7MHz

OSCILLATOR

A=3

0.15Ω

4 PGND

1610 F02

Figure 2. LT1610 Block Diagram

5

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