AIC1653 데이터 시트보기 (PDF) - Analog Intergrations

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AIC1653

Micropower Inverting DC/DC Converter in SOT-23-5

Analog Intergrations 

AIC1653

BLOCK DIAGRAM

VIN

SW

NFB

R1 R2

Q1

+ Bandgap

A1

-

+

A2

-

100mV

Current Limit

Q2

400nS/ 800nS Logic

One-Shot

R3

+

Drive

R4

A3

-+ -

MODE Control

-0.6V

SHDN

Fig. 8 Block diagram of AIC1653

GND

PIN DESCRIPTIONS

PIN 1: SW - Switch Pin. This is the open drain

of the internal N-MOSFET power

switch. Minimize the metal trace

area connected to this pin to

minimize EMI.

PIN 2: GND - Ground. Tie this pin directly to the

local ground plane.

PIN 3: FB - Set the output voltage by values

of R1 and R2 (see typical

application circuit):

R1 = VOUT − 1.23

1.23

R2

+

 2 × 10 −6



PIN 4: SHDN - Shutdown Pin. Tie this pin to

0.9V or higher to enable the

device. Tie below 0.25V to turn

off the device.

PIN 5: VIN - Input Supply Pin. Bypass this pin

with a capacitor as close to the

device as possible.

6

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