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AAT1108 Schematic ( PDF Datasheet ) - Advanced Analog Technology

Teilenummer AAT1108
Beschreibung 2-CHANNEL STEP-UP PWM CONTROLLERS
Hersteller Advanced Analog Technology
Logo Advanced Analog Technology Logo 




Gesamt 11 Seiten
AAT1108 Datasheet, Funktion
Advanced Analog Technology, Inc.
Preliminary and Provisional
AAT1108
2-CHANNEL STEP-UP PWM CONTROLLERS
WITH ADJUSTABLE LDO
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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)
General Description
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.
––
Advanced Analog Technology, Inc.
V 0.1






AAT1108 Datasheet, Funktion
Advanced Analog Technology, Inc.
AAT1108
Electrical Characteristics, VDD = 5.0V (Unless Otherwise Specified) (See Note 1) (continued)
Dead Time Control & PWM
Parameter
Test Condition
Min Typ Max Unit
Input bias current
Input threshold voltage
(DTC)
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IBDT
Vd 0
Vd100
VDTC = 2V
Duty = 0%, fOSC = 10kHz
Duty = 100%,
fOSC = 10kHz
0.1 1
1.38 1.48 1.58
1.87 1.97 2.07
µA
V
Latch input voltage
VDT IDT = 100µA
0.1 0.3 V
Latch mode source current
IDT DTC1,2=2.0V
200 500
µA
Output Stage
Parameter
High-level output voltage
Low-level output voltage
Rise time
Fail time
Leakage current
Operating Current
Parameter
Supply current
Test Condition
VOH IO=-50mA
VOL IO=+50mA
Trise CL=1000pF
Tfail CL=1000pF
Ipeak Vo =6.0V
I DDOFF
I DDON
Test Condition
Output ”OFF” state
PRT =10 k
Min Typ Max Unit
3.6 4.0
V
0.8 1.2 V
100 nS
100 nS
5 µA
Min Typ Max Unit
1.8 mA
2.0 mA
LDO (Vout3 = 3.3V)
Parameter
Output voltage
Line Regulation
Load Regulation
Vrd
LRI
LRO
Test Condition
VDD=5V,Vout3=3.3V
VDD=4V~6.5V,
Iout3=10mA
Iout3=1mA~30mA
Min Typ Max Unit
3.17 3.3 3.43 V
0.08 0.3 %
0.1 %
––
Advanced Analog Technology, Inc.
V 0.1

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