Advanced Analog Technology, Inc.
AAT1351
Details are subject to change without notice
2-CHANNEL SWITCHING REGULATOR
FEATURES
Complete PWM Power Control Circuitry
Under-Voltage Lockout (UVLO) Protection
Open Drain Output
Output Short Circuit Protection
Low Dissipation Current：1.6mA
Dead-Time Control：0% to 100%
Wide Operating Frequency：
10 kHz to 800 kHz
GENERAL DESCRIPTION
The AAT1351 provides an integrated two-channel
pulse-width-modulation (PWM) solution for the
power supply of DC-DC system; this device offers
the systems engineer 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 and voltage
reference circuit are the common features for the
two channels.
Both channels of AAT1351 can be used for DC-DC
converter operations including step-up, step-down,
and inverting. 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 channel 1
(CH1) and channel 2 (CH2) individually, and dead-
time control inputs can be used to control on / off
operation.
With a minimum number of external components,
the AAT1351 offers a simple and cost effective
solution.
V
DD
Range
：
4.0V to 14.0V
PIN CONFIGURATION
TOP VIEW
C
t
R
t
NE1
IE1
OE1
DTC1
OUT1
GND
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
V
REF
SCP
NE2
IE2
OE2
DTC2
OUT2
V
DD
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Advanced Analog Technology, Inc.
AAT1351
PIN DESCRIPTION
PIN NO NAME
1
C
t
I/O
DESCRIPTION
I External Timing Capacitance
I External Timing Resistance
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
R
t
NE1
IE1
OE1
DTC1
OUT1
GND
V
DD
OUT2
DTC2
OE2
IE2
NE2
SCP
V
REF
Noninverting Input of Error Amplifier 1
Inverting Input of Error Amplifier 1
Output of Error Amplifier 1
Output 1 Dead-Time / Soft-Start Setting
Output 1
Ground
I Power Supply
O Output 2
I Output 2 Dead-Time / Soft-Start Setting
I Output of Error Amplifier 2
I Inverting Input of Error Amplifier 2
I Noninverting Input of Error Amplifier 2
I Timer Latch Setting
O Reference Voltage (2.5V) Output
I
I
I
I
O
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Advanced Analog Technology, Inc.
AAT1351
ABSOLUTE MAXIMUM RATINGS
CHARACTERISTICS
SYMBOL
V
DD
V
I
V
O
VALUE
14.0
V
DD
UNIT
V
V
Supply Voltage
Input Voltage (
IE
−
, DTC)
Output Voltage
Output Current
Operating Free-Air Temperature Range
Storage Temperature Range
Power Dissipation
V
DD
+0.3
120
−
20
to +85
−
45
to +125
V
mA
o
o
I
O
T
C
T
storage
C
C
P
d
500
mW
RECOMMENDED OPERATING CONDITIONS
Supply Voltage, V
DD
Input Voltage, IE1, IE2
Output Voltage
Oscillator (OSC) Capacitance
Oscillator (OSC) Resistance
Oscillator (OSC) Frequency
Output Current, I
OUT1
, I
OUT 2
Operating Free-Air Temperature
SYMBOL
V
DD
V
cm
MIN
4.0
MAX
14.0
UNIT
V
0.5
0
100
5.1
10
-
−
20
1.6
V
DD
15,000
50.0
800
100
85
V
V
pF
k
Ω
V
O
C
OSC
R
OSC
f
OSC
I
O
T
C
kHz
mA
o
C
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AAT1351
ELECTRICAL CHARACTERISTICS,
V
DD
= 6.0V (UNLESS OTHERWISE
SPECIFIED) (SEE NOTE 1)
OSCILLATOR
PARAMETER
TEST CONDITION
MIN
TYP MAX UNIT
Frequency
f
OSC
C
OSC
= 330pF,
R
OSC
= 10
k
Ω
V
DD
= 4.0V to 14.0V,
T
C
= 25
o
C
C
OSC
= 330pF,
R
OSC
= 10
k
Ω
160
200
240
kHz
Frequency Changes with
V
DD
f
∆
V
-
1
-
%
UNDER VOLTAGE PROTECTION
PARAMETER
Upper Threshold Voltage
V
UPH
TEST CONDITION
T
C
= 25
o
C
Lower Threshold Voltage
Hysteresis ( V
UPH
– V
UPL
)
V
UPL
V
HYS
T
C
= 25
o
C
T
C
= 25
o
C
MIN TYP MAX UNIT
-
2.9
-
V
-
2.53
-
V
-
0.37
-
V
SHORT CIRCUIT PROTECTION CONTROL
PARAMETER
TEST CONDITION
MIN
TYP MAX UNIT
Input Threshold Voltage
Short Circuit Detect
Threshold Voltage
SCP Terminal Source
Current
Stand-by Voltage
Latch Voltage
V
r1
V
r 2
I
SCP
V
STB
V
LT
CH1, CH2
-
0.65
−
20
1.18
0.70
−
15
-
0.75
−
10
V
V
µ
A
-
-
T
C
=25
o
C.
50
30
100
100
mV
mV
Note 1: Typical values of all parameters are specified at
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