AT1392
Preliminary Product Information
1-Channel Synchronous Buck PWM Controller
General Description
The AT1392 provides complete control and
protection for a DC/DC converter optimized for
high-performance microprocessor applications. It
is designed to drive one P-Channel and one N-
Channel in a buck topology. The AT1392
integrates all of the control, output adjustment into
a single package. The output voltage of the
converter can be precisely regulated with a
maximum tolerance of
±2%
over temperature and
line voltage variations. The AT1392 is a family of
low-noise synchronous step-down DC/DC
converters that is ideally suited for systems
powered from a 1-cell Li-ion battery or from a 3-
cell to 4-cell NiCd, NiMH, or alkaline battery. It
can also be used to USB-Based power system.
Features
• High efficiency
• Using external P and N channel MOSFET
• Maximum Duty 100%
• Oscillation frequency 600KHz
• Soft Start by an external capacity
• Output voltage accuracy
±2%
• Built-in ON/OFF Function
• Stand-by current max. 10µA
• Quiescent Current 1mA
• Input voltage: 2.5V ~7.0V
Applications
• Power Supply for portable devices
Block Diagram
Aimtron reserves the right without notice to change this circuitry and specifications.
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
WWW:
http://www.aimtron.com.tw
Fax: 886-3-563-0879
Email:
service@aimtron.com.tw
1
AT1392
Preliminary Product Information
1-Channel Synchronous Buck PWM Controller
Pin Configuration
Ordering Information
Part number
AT1392P
AT1392P_GRE
Package
TSSOP8
TSSOP8, Green
Marking
AT1392P
AT1392P, date code with one bottom line
Pin Description
Symbol
Pin No.
Descript
Symbol
Pin
No.(A/B)
Descript
OUTN
AGND
VCC
CTL
1
2
3
4
Output for Nch-MOSFET
Power Ground
Power Supply
ON-OFF Control
SS
FB
COMP
OUTP
5
6
7
8
Sotf-Start
Error amplifier inverting
input
Error amplifier output
Output for Pch-MOSFET
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
WWW:
http://www.aimtron.com.tw
Fax: 886-3-563-0879
Email:
service@aimtron.com.tw
2
AT1392
Preliminary Product Information
1-Channel Synchronous Buck PWM Controller
Absolute Maximum Ratings
Parameter
Power Supply Voltage
Source Average Current of OUT
Sink Average Current of OUT
Source Peak Current of OUT
Sink Peak Current of OUT
Input Voltage to Error Amplifier
Continuous power dissipation
Operating temperature
Storage temperature
Condition
—
—
—
—
—
—
TSSOP8（Ta=+25℃）
—
—
Rated Value
Min.
Max.
-
+7
-
-50
-
50
-
-200
-
200
-
6.5
-
500
-30
+85
-55
+125
Unit
V
mA
mA
mA
mA
V
mW
0
C
0
C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are
stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the
operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended
periods may affect device reliability.
Recommended Operating Conditions
(Ta=+25
0
C)
Parameter
Power supply voltage
Control input voltage
Operating temperature
Symbol
V
CC
V
CTL
T
OP
Min.
2.5
0
-20
Values
Typ.
--
--
+25
Max.
6
6
+85
Unit
Ｖ
V
°C
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
WWW:
http://www.aimtron.com.tw
Fax: 886-3-563-0879
Email:
service@aimtron.com.tw
3
AT1392
Preliminary Product Information
1-Channel Synchronous Buck PWM Controller
Electrical Characteristics
(VCC = 5V,Ta =+25℃ , unless otherwise noted. )
Parameter
Input Supply Range
Quiescent Current
Current in standby mode
Entire device
Reference Voltage
Reference Voltage
line-regulation
Rference Variation
with Temperature
Input Offset Voltage
Source Current
Sink Current
Source current Variation
with temperature
Sink current Variation
with temperature
Unity Gain Bandwidth
Common Mode Input
Voltage Range
DC Open Loop Gain
Frequency
High Level Voltage
Sawtooth wave
oscillator (OSC)
Low Level Voltage
Variation with Power
Supply
Variation with
temperature
Charge Current of
SS
Invalid threshold
voltage of SS
Output source current
Output sink current
Output ON resistor
Symbol
V
CC
I
CC
I
ST
V
REF
V
REF-Line
Condition
2.5
Duty=50%,
fOSC=600KHz
PDRV/NDRV No Load
CTL=0V
Ta =-20℃ to +85℃
VCC=2.5V to 6.0V
Ta =-20℃ to +85℃
Values
Min. Typ. Max.
--
1.0
6.0
1.5
10
1.20 1.22 1.24
1
0.5
-1.0
160
-1.5
120
5
1.5
10
-2.0
80
20
20
10.0
0.2
500
110
600
1.0
0.5
1.5
Unit
V
mA
µA
V
mV
%
mV
mA
μA
%
%
MHz
V
V
IO
I
OH
I
OL
V
COMP
= V
REF
–0.5V
V
COMP
= 0.5V
Ta =-20℃ to +85℃
Ta =-20℃ to +85℃
Error amplifier
f
T
V
COM
A
V
fosc
dB
700 KHz
V
V
2
7
%
%
µA
V
-80
mA
mA
30
25
Ω
Ω
Vcc=2.5V to 6V
Ta =-20℃ to +85℃
I
CSS
-1.0
1.0
I
source
I
sink
R
OH
R
OL
Duty≥95% OUT=0V
Duty≤5% OUT=5V
OUT=-15mA
OUT=15mA
-
65
-130
100
18
16
Soft-Start
Output Block
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
WWW:
http://www.aimtron.com.tw
Fax: 886-3-563-0879
Email:
service@aimtron.com.tw
4
AT1392
Preliminary Product Information
1-Channel Synchronous Buck PWM Controller
CTL input voltage
CTL input Current
V
IH
V
IL
I
CTL
Active mode
Standby mode
CTL=5.0V
2.0
0
VCC
0.5
20
V
V
µA
Control Block
Application Circuit
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
WWW:
http://www.aimtron.com.tw
Fax: 886-3-563-0879
Email:
service@aimtron.com.tw
5
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