LT1614CS8 datasheet(5/16 Pages) LINER

5 / 16 page

LT1614

NFB (Pin 1): Negative Feedback Pin. Reference voltage is

– 1.24V. Connect resistive divider tap here. The sug-

gested value for R2 is 24.9k. Set R1 and R2 according to:

OUT

124

45 10

+ 





|| – .

.•

–

VC (Pin 2): Compensation Pin for Error Amplifier. Con-

nect a series RC from this pin to ground. Typical values

are 100k

Ω and 1nF. Minimize trace area at VC.

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

switcher. Must be tied to VIN (or higher voltage) to enable

switcher. Do not float the SHDN pin.

PIN FUNCTIONS

GND (Pin 4): Ground. Connect directly to local ground

plane.

SW (Pin 5): Switch Pin. Minimize trace area at this pin to

keep EMI down.

VIN (Pin 6): Supply Pin. Must have 1µF ceramic bypass

capacitor right at the pin, connected directly to ground.

LBI (Pin 7): Low-Battery Detector Input. 200mV refer-

ence. Voltage on LBI must stay between ground and

700mV. Float this pin if not used.

LBO (Pin 8): Low-Battery Detector Output. Open collec-

tor, can sink 10

µA.A1MΩpull-upisrecommended.Float

this pin if not used. The low-battery detector is disabled

when SHDN is low. LBO is high-Z in this state.

BLOCK DIAGRAM

–

COMPARATOR

RAMP

GENERATOR

BIAS

×10

NFB

ENABLE

200mV

A = 3

ERROR

AMPLIFIER

0.15

Ω

DRIVER

GND

1614 BD

600kHz

OSCILLATOR

LBO

LBI

SHDN

SHUTDOWN

40k

(EXTERNAL)

30k

140k

VIN

VOUT

(EXTERNAL)

Figure 2. Block Diagram

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