Document
Advanced Analog Technology, Inc.
AAT1100
Product information presented is current as of publication date. Details are subject to change without notice
TRIPLE-CHANNEL PWM CONTROLLER
Features
z z z z z z z z z z z Complete PWM Power Control Circuitry Precision Reference¡G 1.25V±1% (25 oC) Low Operating Voltage¡G 2.5V to 7.0V Under-Voltage Lockout Protection Totem Pole Output Output Short Circuit Protection Low Dissipation Current¡G 2.5mA at 500 kHz and 50% Duty Cycle Separate On / Off Control for CH1, CH3 Pair and CH2 (Refer to Function Table) Dead Time Control¡G 0 to 100% Wide Operating Frequency¡G 50 kHz to 1MHz Minimized External Components
General Description
The AAT1100 provides an integrated triple-channel pulse-width-modulation (PWM) solution for the power supply of DC-DC system; this device offers system engineer the flexibility to custom-make the power supply circuitry to a specific application. Each channel contains its own error amplifier, PWM comparator, dead–time control (DTC) and output driver. The under-voltage protection, oscillator, short circuit protection and voltage reference circuit are common features of the three channels. The AAT1100 contains two boost circuits (CH1, CH3) and a buck-boost circuit (CH2). DTC can be set to provide 0% to 100% dead-time through a divider network. Soft-Start can be implemented by paralleling the DTC resistor with a capacitor. Two DTC inputs are assigned for CH1, CH3 pair and CH2 individually, and DTC inputs can be used to control on / off operation. In addition, this device can operate from 2.5V to 7.0V supply voltages to achieve efficient operation in low power system. With a minimal number of external components, the AAT1100 offers a simple and cost effective solution.
Pin Configuration
TOP VIEW
IE2 OE 2 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 OE3 IE3 IE1 OE 1 OSC DTC2 DTC13
VREF
VDD
OUT2 OUT3 OUT1 GND SCP
(TSSOP-16 PACKAGE)
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Advanced Analog Technology, Inc.
AAT1100
Function Table
Condition DTC13 > 0.3V, DTC2 > 0.3V DTC13 > 0.3V, DTC2 < 0.2V DTC13 < 0.2V, DTC2 > 0.3V DTC13 < 0.2V, DTC2 < 0.2V ON ON Output CH1 ”High” ”High” ON ON CH2 ”Low” ”Low” OFF ”High” OFF ”High” CH3 ON ”High” ON ”High” OFF ”Low” OFF ”Low”
OFF ”Low” OFF ”Low”
Pin Description
Pin No 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Name IE2 OE2
VDD
OUT2 OUT3 OUT1 GND SCP VREF DTC13 DTC2 OSC OE1 IE1 IE3 OE3
I/O I I/O I O O O
Description Inverting Input Terminal of Error Amplifier 2 (EA2) Output of Error Amplifier 2 (EA2) Supply Voltage Channel 2 Output Channel 3 Output Channel 1 Output Ground I Short Circuit Protection O Reference Voltage Output I Dead-Time Control of Channel 1, 3 (CH1, CH3) I Dead-Time Control of Channel 2 (CH2) I Frequency Setting Capacitor & Resistor Input I/O Output of Error Amplifier 1 (EA1) I Inverting Input Terminal of Error Amplifier 1 (EA1) I Inverting Input Terminal of Error Amplifier 3 (EA3) I/O Output of Error Ampli.