Advanced Analog Technology, Inc.
Advanced Analog Technology, Inc
. V 1.0
AAT1104/AAT1104A
2-CHANNEL SWITCHING REGULATOR CONTROLLER
Feature
s
Complete PWM Power Control Circuitry
Precision Reference2.505V1% (25
o
C)
Under-voltage Lockout Protection
Open Drain Output
Output Short Circuit Protection
Low Dissipation Current1.6mA
Dead Time Control0 to 100%
Wide Operating Frequency
10kHz to 800kHz
VDD range4.0V to 6.5V
Pin Configuration
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
CT
RT
INV1
FB1
DTC1
GND
OUT1
V
ref
NON2
SCP
INV2
FB2
DTC2
OUT2
TOP VIEW
(TSSOP-16 PACKAGE)
NON1
V
DD
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, deadtime
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.
Advanced Analog Technology, Inc.
Advanced Analog Technology, Inc
. V 1.0
AAT1104/AAT1104A
Pin Description
Pin
# Name I/O
Description
1
CT
I External timing capacitance
2
RT
I External timing resistance
3
NON1
I Positive input for error amplifier 1
4 INV1 I
Negative input for error amplifier 1
5
FB1
I Output for error amplifier 1
6
DTC1
I Output 1 dead time / soft start setting
7 OUT1 O
Output
1
8 GND
Ground
9 V
DD
I
Power
supply
10 OUT2 O
Output
2
11
DTC2
I Output 2 dead time / soft start setting
12
FB2
I Output for error amplifier 2
13 INV2 I
Negative input for error amplifier 2
14
NON2
I Positive input for error amplifier 2
15
SCP
I Timer latch setting
16 V
ref
O Reference voltage (2.505V) output
Advanced Analog Technology, Inc.
Advanced Analog Technology, Inc
. V 1.0
AAT1104/AAT1104A
Absolute Maximum Ratings
CHARACTERISTICS SYMBOL
VALUE
UNIT
Supply voltage
DD
V
7 V
Input voltage (IN-, DTC)
I
V
DD
V
V
Output voltage
O
V
DD
V +0.3
V
Output current
O
I
120 mA
Operating free-air temperature range
ope
T
-20 to 85
o
C
Storage temperature range
stg
T
-65 to 150
o
C
Power dissipation
Pd
500
mW
Recommended Operating Conditions
Symbol
Min
Max
Unit
Supply voltage,
DD
V
DD
V
4.0 6.5 V
Input voltage, IN1, IN2
V
cm
0.5 1.6 V
Output voltage
O
V
0
DD
V
V
OSC capacitor
T
C
100 15000 pF
OSC resistor (Note 1)
T
R
5.1 50 k
Oscillator frequency
OSC
f
10 800 kHz
Output current, Iout1, Iout2
O
I
100 mA
Operating free-air temperature
ope
T
-20 85
o
C
Advanced Analog Technology, Inc.
Advanced Analog Technology, Inc
. V 1.0
AAT1104/AAT1104A
Electrical Characteristics,
DD
V = 5.0V (Unless Otherwise Specified) (See Note 1)
Oscillator
Parameter
Test Condition
Min Typ Max
Unit
Frequency
OSC
f
T
C = 220pF,
T
R = 10k
320 400 480
KHz
Frequency change with
DD
V
dV
f
DD
V = 4.0V to 6.0V,
A
T = 25
o
C
T
C = 220pF,
T
R = 10k
1
%
Under-voltage Protection
Parameter
Test
Condition
Min
Typ
Max
Unit
Upper threshold voltage
UPH
V
A
T = 25
o
C
2.6 2.9 3.2 V
Lower threshold voltage
UPL
V
A
T = 25
o
C
2.23
2.53 2.83 V
Hysteresis (
UPH
V
UPL
V
)
HYS
V
A
T = 25
o
C
0.37 V
Short Circuit Protection Control
Parameter
Test
Condition
Min
Typ
Max
Unit
Ch-1, 2
0.95
1.05 1.15
Input threshold voltage
1
r
V
AAT1104A only
1.02 1.18 1.34
V
1.48
1.64
1.8
Short-circuit detect threshold
voltage
2
r
V
AAT1104A only
0.6 0.7 0.8
V
-1.5
-2.5
-3.5
SCP terminal source current
SCP
I
AAT1104A only
-10 -15 -20
A
Standy Voltage
V
STB
50 100 mV
Latch Voltage
V
LT
30 100 mV
Note1: Typical values of all parameters are specified at
A
T
=25
o
C.
Advanced Analog Technology, Inc.
Advanced Analog Technology, Inc
. V 1.0
AAT1104/AAT1104A
Electrical Characteristics,
DD
V = 5.0V (Unless Otherwise Specified) (See Note 1) (continued)
Reference Voltage
Parameter
Test
Conditions
Min
Typ
Max
Unit
Reference voltage
REF
V
mA
1
I
REF
-
=
,
A
T = 25
o
C 2.48 2.505 2.53 V
Input voltage regulation
RI
V mA
1
I
REF
-
=
,
V
DD
= 4.0V to 6.0V
1 5
mV
Output regulation
RO
V mA
1
.
0
I
REF
-
=
to -3mA
1
10
mV
EA (Error Amplifier)
Parameter
Test Condition
Min Typ Max
Unit
Input offset voltage
IO
V Ch-1,2, A
V
=1
6
mV
Input bias current
IB
I
Ch-1,2
15
100
nA
Input voltage range
IR
V Ch-1,2 0.5
1.6
V
Open-loop voltage
amplification
VD
A
70
85
dB
+
OM
V
2.3
2.5
Output voltage swing
-
OM
V
0.7
0.9
V
Output sink current
+
OM
I
FB=1.25V 3
20
mA
Output source current
-
OM
I
FB=1.25V -45
-75
A
Common-mode rejection ratio CMRR
60 80 dB
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