AT1382A
Preliminary Product Information
4-Channel DC-DC Converter for DSC
Features
• Low start-up power supply voltage :1.4V(CH4)
• Wide supply voltage range from 1.8V to 7V
(CH1~4)
• High speed operation is possible: Maximum
1 MHz
• Supports for up, flyback and up/down SEPIC
conversion (CH1~4)
• Totem-pole type output for MOSFET
• Built-in On/Off function
• Built-in Short-Circuit Protection.
General Description
The AT1382A is a 4-channel PWM DC/DC control
IC for low voltage applications with a soft start
function and short circuit detection function. This
IC is ideal for up conversion, down conversion,
and up/down conversion (using a step-up/step-
down SEPIC system with free input and output
settings). Four channels can be built in the
LQFP48 package, each channel be controlled, and
soft-start.
The AT1382A include one comparator to generate
low-battery warning outputs. It also contains a gain
block that can be used with an external P-channel
MOSFET to make a low-dropout linear regulator.
Applications
• Digital Cameras
• CCD Imaging Devices
• Camcorders
Pin Assignment
Ordering Information
Part number
AT1382AF
AT1382AF_PBF
AT1382AF_GRE
Package
LQFP48
LQFP48, PB-Free
LQFP48,Green
Marking
AT1382AF
AT1382AF,date code with one bottom line
AT1382AF,date code with two bottom line
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
AT1382A
Preliminary Product Information
4-Channel DC-DC Converter for DSC
Pin Description
Pin No. Pin name
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
DTC4
FB4
IN4
CS4
CTL4
DTC3
FB3
IN3
CS3
CTL3
CSCP
VREF
GND
GND
VBG
VCC
VCC
POR
RT
CT
VB
CTL
ENLD
CT2
CTL2
CS2
IN2
FB2
DTC2
CTL1
CS1
IN1
FB1
DTC1
LBI
LBO
AI
AO
OUT1_1
OUT1_2
OUT2_1
OUT2_2
N.C.
PVCC
N.C.
PGND
OUT3
OUT4
I/O
I
O
I
-
I
I
O
I
-
I
-
O
P
P
TEST
P
P
TEST
-
-
O
I
I
TEST
I
-
I
O
I
I
-
I
O
I
I
O
I
O
O
O
O
O
-
P
-
P
O
O
Function
CH4 Dead Time Control
CH4 Error Amplifier Output
CH4 Error Amplifier Inverted Input
CH4 Soft Start Setting Capacitor
CH4 ON/OFF Control
CH3 Dead Time Control
CH3 Error Amplifier Output
CH3 Error Amplifier Inverted Input
CH3 Soft Start Setting Capacitor
CH3 ON/OFF Control
Timer Latch Short-Circuit Detection Capacitor Input
Reference 0.9V Output
Ground
Ground
Reference Test Pin
Power Supply
Power Supply
Pre-OSC Change to Main-OSC Indicator
Oscillation Frequency Setting Resistor
Oscillation Frequency Setting Capacitor
Reference 1.8V Output
Power Supply Control
Gain Block Enable Input
Triangular wave OSC Inverted output Test Pin
CH2 ON/OFF Control
CH2 Soft Start Setting Capacitor
CH2 Error Amplifier Inverted Input
CH2 Error Amplifier Output
CH2 Dead Time Control
CH1 ON/OFF Control
CH1 Soft Start Setting Capacitor
CH1 Error Amplifier Inverted Input
CH1 Error Amplifier Output
CH1 Dead Time Control
Low Battery Detected Input
Low Battery Indicator
LDO Regulated Input
LDO Drive Output
CH1 Main Side Output
CH1 Synchronous Rectifier Side Output
CH2 Main Side Output
CH2 Synchronous Rectifier Side Output
Drive Output Block Power Supply
Drive Output Block Ground
CH3 Output
CH4 Output
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
AT1382A
Preliminary Product Information
4-Channel DC-DC Converter for DSC
Block Diagram
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
AT1382A
Preliminary Product Information
4-Channel DC-DC Converter for DSC
Absolute Maximum Ratings
Parameter
Power supply voltage
Output current
Output peak current
Power dissipation
Operation temperature
Storage temperature
exceed these ratings.
Symbol
Vcc
Io
Io
P
D
Topr
Tstg
Condition
--
Output pin
Output pin, Duty≦5%
Ta
≦
25℃ (LQFP-48P)
--
--
Rating
Min
Max
--
--
--
--
-30
-55
8
20
200
860
85
125
Unit
V
mA
mA
mW
℃
℃
*
Semiconductor devices can be permanently damaged by application of stress in excess of absolute ratings. Do not
Recommended Operating Conditions
Value
Parameter
Startup power supply voltage
Power supply voltage
Reference voltage output current
VB pin output current
Input voltage
Control input voltage
Output current
Oscillator
Timing capacitor
Timing resistor
Soft start capacitor
Short detection capacitor
VB pin capacitor
Operating ambient temperature
Symbol
Vcc
Vcc
I
OR
I
B
V
IN
V
CTL
Io
f
OSC
C
T
R
T
Cs
C
CS4
C
SCP
C
VB
Ta
CH4
CH4
Condition
Min
1.4
1.5
1.8
-1
-0.5
0
0
--
1
100
47
8.2
--
--
--
--
--
--
0.082
-30
CH4
CH1 to CH3
VREF pin
VB pin
IN1 to IN4 pins
CTL pin
OUT pin (CH1 to CH3)
OUT pin (CH4)
--
--
--
CH1 to CH3
Unit
Typ
--
5.0
5.0
--
--
--
--
2
2
500
100
18
0.027
0.47
0.1
0.1
25
Max
7
7
7
0
0
Vcc-1.8
7
15
15
1000
560
100
1.0
1.0
1.0
--
85
V
V
V
mA
mA
V
V
mA
mA
kHz
pF
kΩ
μF
μF
μF
μF
℃
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
AT1382A
Preliminary Product Information
4-Channel DC-DC Converter for DSC
Electrical Characteristics
(Ta=25℃, VCC=PVCC=5V)
Parameter
Reference voltage block [REF]
Reference voltage
Output voltage temperature
stability
Input stability
Load stability
Shout circuit output current
Symbol
V
REF
Condition
Measure result
Unit
Min. Typ. Max.
0.88
-
-10
-10
-20
0.90
0.5
-
-
-5
0.92
-
10
10
-1
V
%
mV
mV
mA
△V
REF
Ta = -30℃ to 85℃
/V
REF
Line
Load
I
OSC
V
TH
V
H
V
RST
V
TH2
VCC=1.8V to 7V
VREF=0mA to –1mA
VREF=0.7V
Under voltage lockout block [U.V.L.O]
Threshold voltage(CH1~CH3)
Hysteresis width(CH1~CH3)
Reset voltage(CH1~CH3)
CH4 Pre-OSC change to Main-
OSC threshold
Soft start block [CS]
Charge current
Short circuit detection block [SCP]
Threshold voltage
Input source current
V
TH
I
CSCP
0.65
-1.5
0.70
-1.0
0.75
-0.7
V
μA
I
CS
-6.0
-5.0
-4.0
μA
1.5
-
1.6
-
1.6
0.2
1.7
1.7
1.7
-
1.8
-
V
V
V
V
Triangular wave oscillator block [OSC]
Oscillator frequency
Frequency stability for voltage
Frequency stability for
temperature
f
OSC
△f
/fdv
△f
/fdt
CT=100pF, RT=20kΩ
VCC=1.8V to 7V
Ta=-30℃ to 85℃
400
-
-
500
1
1
600
10
-
kHz
%
%
Error amplifier block [Error Amp](CH1~CH4)
Threshold voltage
V
T
temperature stability
Input bias current
Voltage gain
V
TH
FB=0.9V
0.69
-
-320
-
0.70
0.5
-80
100
0.71
-
-
-
V
%
nA
dB
△V
T
/V
T
Ta = -30℃ to 85℃
I
B
A
V
IN=0V
DC
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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