Advanced Analog Technology, Inc.


– 台灣類比科技股份有限公司 –
– Advanced Analog Technology, Inc. –
Page 1 of 16 V 1.0
AAT1105A
Details are subject to change without notice.

BUCK_BOOST & BOOST PWM CONTROLLER

Features
z Complete PWM Power Control Circuitry
CH1: Buck_Boost, CH2: Boost
z Under-Voltage Lockout (UVLO) Protection
z Totem Pole Output
z Output Short Circuit Protection
z Dead-Time Control：0% to 100%
z Wide Operating Frequency：
10kHz to 800kHz
z Shutdown Control
z Power Good Protection
z
DD
V Range: 2.6V~6.5V

Pin Configuration

1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
Ct
Rt
IE1
OE1
DTC1
GND
OUT1
V
REF
PGO
SCP
IE2
OE2
DTC2
OUT2
TOP VIEW
(TSSOP-16 PACKAGE)
SHDN
V
DD
General Description
The AAT1105A 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 specific applications.
Each channel contains its own error amplifier,
PWM comparator, dead–time control (DTC), and
output driver. The under-voltage protection,
oscillator, short circuit protection (SCP) and voltage
reference circuit are the common features for the
two channels.
The AAT1105A contains one step-up (boost) circuit
at channel two (CH2) and one inverting
(buck_boost) circuit at channel one (CH1).
Dead-time control can be set to provide 0% to
100% dead-time through a resistive divider network.
Soft-start can be implemented by paralleling the
DTC resistor with a capacitor. Two dead-time
control inputs are assigned for CH1 and CH2
individually, and dead-time control inputs can be
used to control on / off operation.
The compact design and optimized external parts of
AAT1105A offers a simple and effective solution.