Advanced Analog Technology, Inc.
AAT1107
Details are subject to change without notice.
BUCK_BOOST & BOOST PWM CONTROLLER
WITH ADJUSTABLE LDO
FEATURES
Complete PWM Power Control Circuitry
CH1: Buck_Boost, CH2: Boost
Adjustable Low Dropout (LDO) Regulator
Under-Voltage Lockout (UVLO) Protection
Totem Pole Output
Output Short Circuit Protection
Dead Time Control : 0% to 100%
Wide Operating Frequency:
10kHz to 800kHz
GENERAL DESCRIPTION
The AAT1107 provides an integrated two-channel
pulse-width-modulation (PWM) solution for the
power supply of DC-DC system. This device
offers system engineers the flexibility to tailor-make
the power supply circuitry for the specific
applications.
Each channel contains its own error amplifier,
PWM comparator, dead-time control (DTC) and
output driver. The two channels share common
features of under-voltage protection, oscillator,
short circuit protection and voltage reference circuit.
Two dead-time control inputs are assigned for
channel (CH1) and channel 2 (CH2) individually,
and dead-time control inputs can be used to control
on/off operation.
The AAT1107 contains one step-up (boost) circuit
at CH2 and one inverting (buck_boost) circuit at
CH1. In addition, DTC can be set to provide 0%
to 100% dead-time through a resistive divider
network and soft-start can be implemented by
paralleling the DTC resistor with a capacitor.
The Maximum output current of LDO regulator can
be enlarged by connecting an nMOSFET (or NPN
bipolar) as a source follower stage at OUT3 pin.
PIN CONFIGURATION
TOP VIEW
C
t
R
t
IE3
IE1
OE1
DTC1
OUT1
GND
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
V
REF
SCP
OUT3
IE2
OE2
DTC2
OUT2
V
DD
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