AIC1628CS datasheet(4/7 Pages) AIC

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AIC1628

BLOCK DIAGRAM

ERROR COMPARATOR

LATCH

CURRENT LIMIT

COMPARATOR

1.22V

REFERENCE

VOLTAGE

PFM

OSCILLATOR

VREF

VIN

SHDN

OUTPUT DRIVER

VIN

60mV

DHI

DLOW

GND

PIN DESCRIPTIONS

PIN 1: VIN

- 4V to 24V input supply voltage.

PIN 2: VREF - 1.22V reference output. Bypass

with a 0.047

µF capacitor to GND.

Sourcing capability is guaran-

teed to be greater than 250

µA.

PIN 3: SHDN - Logical input to shutdown the

chip.

>1.5V = normal operation,

GND = Shutdown,

Can not be floating or forced

greater than 15V. In shutdown

mode DLOW and DHI pins are

at low level.

PIN 4: FB-

Feedback signal input to sense

VREF. Connecting a resistance

R1 to VOUT and a resistance R2

to GND yields the output voltage:

VOUT = (R1+R2)/R2 x VREF

(Refer to typical application cir-

cuit)

PIN 5: GND - Power ground.

PIN 6: DLOW -Driver sinking output. Connected to

gate of the external N-channel MOS-

FET or base of the NPN bipolar tran-

sistor.

PIN 7: DHI

- Driver sourcing output. Connected to

DLOW when using an external N-

channel MOSFET. When using an

external NPN bipolar transistor, con-

nect a base resistance RB from this

pin to DLOW. RB value depends on

VIN, inductor and NPN current gain.

PIN 8: CL

- Current-limit input. Threshold voltage

is 60mV from VIN. This pin clamps

the switch peak current to prevent

over-current damage to the external

switch, under abnormal conditions.

AIC1628CS Datasheet(PDF) 4 Page - Analog Intergrations Corporation

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