AAT1108 Datasheet, PDF (1/11 Pages) Advanced Analog Technology, Inc. – 2-CHANNEL STEP-UP PWM CONTROLLERS WITH ADJUSTABLE LDO

Advanced Analog Technology, Inc.
Preliminary and Provisional
AAT1108
2-CHANNEL STEP-UP PWM CONTROLLERS
WITH ADJUSTABLE LDO
Features
General Description
z Complete PWM Power Control Circuitry
z Adjustable LDO Regulator
z Under-voltage Lockout Protection
z Totem pole Output
z Output Short Circuit Protection
z Dead Time Control 0 to 100%
z Wide Operating Frequency
10kHz to 800kHz
Pin Configuration
TOP VIEW
CT ₁
16 ^Vref
RT ₂
15 SCP
INV3 3
14 OUT3
INV1 ₄
13 INV2
FB1 ⁵
12 FB2
DTC1 6
11 DTC2
OUT1 7
10 OUT2
GND ⁸
9
VDD
(TSSOP-16 PACKAGE)
The AAT1108 series provides an integrated
two-channel pulse-width-modulation (PWM)
solution for the power supply of DC-DC system,
this device offers the systems engineer the
flexibility to tailor the power supply circuitry to a
specific application. Each channel contains its own
error amplifier, PWM comparator, dead–time
control and output driver. The under-voltage
protection, oscillator, short circuit protection and
voltage reference circuit are common for the two
channels.
The AAT1108 contains two boost (step-up)
exclusive circuits. Dead-time control (DTC) can be
set to provide 0% to 100% dead time by resistive
divider network. Soft start can be implemented by
paralleling the DTC resistor with a capacitor. Two
dead time control inputs are assigned for Ch-1 and
Ch-2 individually, and dead time control inputs can
be used to control on / off operation.
The maximum output currents of LDO regulator
can be enlarged by connect a N_MOS FET (or NPN
bipolar) as a source follow stage at out3 pin.
*Spec is subject to change without notice in this document.
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Advanced Analog Technology, Inc.
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