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Advanced Analog Technology, Inc.
AAT1104/AAT1104A
2-CHANNEL SWITCHING REGULATOR CONTROLLER
Features Complete PWM Power Control Circuitry Precision ReferenceG 2.505V1% (25 oC) Under-voltage Lockout Protection Open Drain Output Output Short Circuit Protection Low Dissipation CurrentG 1.6mA Dead Time ControlG 0 to 100% Wide Operating FrequencyG 10kHz to 800kHz VDD rangeG 4.0V to 6.5V Pin Configuration
General Description
The AAT1104/AAT1104A 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. Both channel of AAT1104/AAT1104A can be used for DC/DC converter operations including step-up, step-down, and inverting. 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. With a minimum number of external components, the AAT1104/AAT1104A offers a simple and cost effective solution.
*Spec is subject to change without notice in this document.
TOP VIEW
CT RT NON1 INV1 FB1 DTC1 OUT1 GND 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 Vref SCP NON2 INV2 FB2 DTC2 OUT2 VDD
(TSSOP-16 PACKAGE)
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Advanced Analog Technology, Inc.
AAT1104/AAT1104A
Pin Description Pin #
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
Name
CT RT NON1 INV1 FB1 DTC1 OUT1 GND VDD OUT2 DTC2 FB2 INV2 NON2 SCP Vref
I/O
I External timing capacitance I External timing resistance
Description
I Positive input for error amplifier 1 I Negative input for error amplifier 1 I Output for error amplifier 1 I Output 1 dead time / soft start setting O Output 1 Ground I Power supply O Output 2 I Output 2 dead time / soft start setting I Output for error amplifier 2 I Negative input for error amplifier 2 I Positive input for error amplifier 2 I Timer latch setting O Reference voltage (2.505V) output
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AAT1104/AAT1104A
Absolute Maximum Ratings CHARACTERISTICS Supply voltage Input voltage (IN-, DTC) Output voltage
Output current Operating free-air temperature range Storage temperature range Power dissipation
SYMBOL VDD VI VO
IO
Tope Tstg
VALUE 7
VDD VDD +0.3 120 -20 to 85 -65 to 150 500
UNIT V V V
mA
o o
C C
Pd
mW
Recommended Operating Conditions
Supply voltage, VDD Input voltage, IN1, IN2 Output voltage OSC capacitor OSC resistor (Note 1) Oscillator frequency Output current, Iout1, Iout2 Operating free-air temperature
Symbol VDD Vcm VO
CT RT f OSC
Min 4.0 0.5 0
100 5.1 10 -20
Max 6.5 1.6 VDD
15000 50 800 100 85
Unit V V V
pF k[ kHz mA
o
IO
Tope
C
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Advanced Analog Technology, Inc.
AAT1104/AAT1104A
Electrical Characteristics, VDD = 5.0V (Unless Otherwise Specified) (See Note 1) Oscillator Parameter Test Condition Min Typ Frequency 320 400 f OSC C T = 220pF, R T = 10k[
Frequency change with VDD f dV VDD = 4.0V to 6.0V, TA = 25 oC C T = 220pF, R T = 10k[ 1
Max Unit 480 KHz
%
Under-voltage Protection
Parameter Test Condition Min Typ Max Unit
Upper threshold voltage Lower threshold voltage Hysteresis ( VUPH - VUPL )
VUPH VUPL VHYS
TA = 25 C TA = 25 oC TA = 25 C
o
o
2.6 2.23
2.9 2.53 0.37
3.2 2.83
V V V
Short Circuit Protection Control
Parameter Test Condition Min Typ Max Unit
Input threshold voltage Short-circuit detect threshold voltage SCP terminal source current Standy Voltage Latch Voltage
Vr1
Ch-1, 2 AAT1104A only AAT1104A only AAT1104A only
0.95 1.02 1.48 0.6 -1.5 -10
1.05 1.18 1.64 0.7 -2.5 -15 50 30
1.15 1.34 1.8 0.8 -3.5 A -20 100 100 mV mV V V
Vr 2
I SCP VSTB VLT
Note1: Typical values of all parameters are specified at
TA =25 oC.
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Advanced Analog Technology, Inc.
AAT1104/AAT1104A
Electrical Characteristics, VDD = 5.0V (Unless Otherwise Specified) (See Note 1) (continued) Reference Voltage
Parameter Test Conditions Min
o
Typ
Max
Unit
Reference voltage Input voltage regulation Output regulation
VREF VRI VRO
I REF = -1mA , TA = 25 C I REF = -1mA , VDD = 4.0V to 6.0V I REF = -0.1mA to -3mA
2.48
2.505 1 1
2.53 5 10
V mV mV
EA (Error Amplifier)
Parameter Test Condition
Min
Typ
15
Input offset voltage Input bias current Input voltage range Open-loop voltage amplification Output voltage swing Output sink current Output source current
VIO I IB VIR A VD VOM + VOM - I OM + I OM -
Ch-1,2, AV=1 Ch-1,2 Ch-1,2 0.5 70 2.3 FB=1.25V FB=1.25V 3 -45 60
Max Unit 6 mV
100 1.6 nA V dB V 0.9 mA A dB
85 2.5 0.7 20 -75 80
Common-mode rejection ratio CMRR
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Advanced Analog Technology, Inc.
AAT1104/AAT1104A
Electrical Characteristics, VDD = 5.0V (Unless Otherwise Specified) (See Note 1) (continued) Dead Time Control & PWM Parameter Test Condition Min Typ Max Unit 0.1 1 A Input bias current I BDT VDTC = 2V
Input threshold voltage (DTC)
Vd 0 Vd100
Duty = 0%, f OSC = 10kHz AAT1104A only Duty = 100%, f OSC = 10kHz AAT1104A only IDT = 40A DTC1,2=0V
1.87 1.85 1.38 1.2 2.28 -200
1.97 2.05 1.48 1.45 2.48 -560
2.07 2.25 1.58 1.7 V A V
Latch input voltage Latch mode source current
VDT IDT
Output Stage
Parameter Test Condition
Min
Saturation voltage Leakage current
VSAT Ipeak
IO = 75mA] CH-1,2^ Vo =6.0V
Typ 0.8
Max Unit 1.2 V 5 A
Operating Current
Parameter Test Condition
Min
Supply current
I DD-OFF I DD-ON
Output "OFF "state RRT =10k[
Typ 1.3
1.6
Max Unit mA
mA
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AAT1104/AAT1104A
Function Block Diagram
FB1 NON1 INV1
Err-Amp Scpcomp PWM
OUT1
GND
UVC
NON2 INV2 FB2
Err-Amp PWM Vref UVC
OUT2
CT
DTC1 OSC
Vref UVC UVC LATCH
RT
DTC2
UVLO
VDD
LATCH VDD
SCP SCP
UVC
Vref
VREF
Vref
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AAT1104/AAT1104A
Application Circuit
VREF
VDD
R12 R13 R11
option circuit: charge pump circuit
VP3
Q1 D1 L1 C9
VDD
VN1 C1
NON1
R5
OUT1
VN1
Inverting output C8 D3
D4 C7
FB1
R1 R2 R3 R4
INV1
VP2
VREF
AAT1104 AAT1104A
OUT2
VDD R16
VDD
VDD L2
VP2
Q3 D2 Q2 Q4 C10 Step_up output
R17 VREF C2
NON2
R6
FB2
R14
R18
INV2
R15
VREF
C4 R7 R9 C5
CT DTC1 RT DTC2
R8
R10
GND
CT RT
SCP
C3
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Advanced Analog Technology, Inc.
AAT1104/AAT1104A
Timing Chart AAT1104
1.V97
BF TC D CT
1.0V5
1.48V
OTT MU W P U P OUTUPT
1.64V
SP C
DT t
O C PM S
2V . 5 3 o L tc k u r fe
VD
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Advanced Analog Technology, Inc.
AAT1104/AAT1104A
Timing Chart AAT1104A
2.0V5
BF TC D CT
1.1V8
1.45V
OTT MU W P U P OUTUPT
0.V7
SP C
DT t
O C PM S
2V . 5 3 o L tc k u r fe
VD
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Advanced Analog Technology, Inc.
AAT1104/AAT1104A
Package Dimension (Unit: Mil)
D
A1
A A2
e
E
E1
b
12 X
y
A1 A2 b C D E E1 e L y K
0 .0 5 0 .2 0 4 .9 0 6 .2 0 4 .3 0 0 .5 0
0 .1 0 1 .0 0 0 .2 5 0 .1 2 7 5 .0 7 5 6 .4 0 4 .4 0 0 .6 5 0 .6 0 4
0 .1 5 1 .0 5 0 .2 8 5 .1 0 6 .6 0 4 .5 0 0 .7 0 0 .0 7 6 8
0 .0 0 2 0 .0 0 8 0 .1 9 3 0 .2 4 4 0 .1 7 0 0 .0 2 0
0 .0 0 4 0 .0 3 9 0 .0 1 0 0 .0 0 5 0 .1 9 9 8 0 .2 5 2 0 .1 7 3 0 .0 2 6 0 .0 2 4 4
0 .0 0 6 0 .0 4 1 0 .0 1 1 0 .2 0 0 0 .2 6 0 0 .1 7 7 0 .0 2 8 0 .0 0 3 8
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