AIM AT1382B Datasheet

AT1382B

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 down and up/down Zeta
conversion (CH1)

• Supports for up, flyback and up/down SEPIC
conversion (CH2,3,4)

• Totem-pole type output for MOSFET

• Built-in On/Off function

• Built-in Short-Circuit Protection

Applications

• Digital Cameras

• CCD Imaging Devices

• Camcorders

General Description

The AT1382B 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/step­down Zeta(CH1) and SEPIC(CH2,3,4) system with
free input and output settings). Four channels can
be built in the LQFP48 package, each channel be
controlled, and soft-start.

The AT1382B 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.

Pin Assignment

Ordering Information

Part number Package Marking

AT1382B LQFP48 AT1382BF

2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: [phone] WWW: http://www.aimtron.com.tw
Fax: [phone] Email: [e-mail]

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AT1382B

4-Channel DC-DC Converter for DSC

Pin Description

Pin No. Pin name I/O Function

1 DTC4 I CH4 Dead Time Control
2 FB4 O CH4 Error Amplifier Output
3 IN4 I CH4 Error Amplifier Inverted Input
4 CS4 - CH4 Soft Start Setting Capacitor
5 CTL4 I CH4 ON/OFF Control
6 DTC3 I CH3 Dead Time Control
7 FB3 O CH3 Error Amplifier Output
8 IN3 I CH3 Error Amplifier Inverted Input

9 CS3 - CH3 Soft Start Setting Capacitor
10 CTL3 I CH3 ON/OFF Control
11 CSCP - Timer Latch Short-Circuit Detection Capacitor Input
12 VREF O Reference 0.9V Output
13 GND P Ground
14 GND P Ground
15 VBG TEST Reference Test Pin
16 VCC P Power Supply
17 VCC P Power Supply
18 POR TEST Pre-OSC Change to Main-OSC Indicator
19 RT - Oscillation Frequency Setting Resistor
20 CT - Oscillation Frequency Setting Capacitor
21 VB O Reference 1.8V Output
22 CTL I Power Supply Control
23 ENLD I Gain Block Enable Input
24 CT2 TEST Triangular wave OSC Inverted output Test Pin
25 CTL2 I CH2 ON/OFF Control
26 CS2 - CH2 Soft Start Setting Capacitor
27 IN2 I CH2 Error Amplifier Inverted Input
28 FB2 O CH2 Error Amplifier Output
29 DTC2 I CH2 Dead Time Control
30 CTL1 I CH1 ON/OFF Control
31 CS1 - CH1 Soft Start Setting Capacitor
32 IN1 I CH1 Error Amplifier Inverted Input
33 FB1 O CH1 Error Amplifier Output
34 DTC1 I CH1 Dead Time Control
35 LBI I Low Battery Detected Input
36 LBO O Low Battery Indicator
37 AI I LDO Regulated Input
38 AO O LDO Drive Output
39 OUT1_1 O CH1 Main Side Output
40 OUT1_2 O CH1 Synchronous Rectifier Side Output
41 OUT2_1 O CH2 Main Side Output
42 OUT2_2 O CH2 Synchronous Rectifier Side Output
43 N.C. ­44 PVCC P Drive Output Block Power Supply
45 N.C. ­46 PGND P Drive Output Block Ground
47 OUT3 O CH3 Output
48 OUT4 O CH4 Output

2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: [phone] WWW: http://www.aimtron.com.tw
Fax: [phone] Email: [e-mail]

2

AT1382B

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: [phone] WWW: http://www.aimtron.com.tw
Fax: [phone] Email: [e-mail]

3

AT1382B

g

yp

4-Channel DC-DC Converter for DSC

Absolute Maximum Ratings

Parameter Symbol Condition

Ratin

Min Max

Unit

Power supply voltage Vcc -- -- 8 V

Output current Io Output pin -- 20 mA

Output peak current Io

Power dissipation P

Operation temperature Topr -- -30 85

Storage temperature Tstg -- -55 125

Semiconductor devices can be permanently damaged by application of stress in excess of absolute ratings. Do not

*

exceed these ratings.

Output pin, Duty≦5%

Ta≦25℃ (LQFP-48P)

D

-- 200 mA

-- 860 mW

℃

℃

Recommended Operating Conditions

Val ue

Parameter Symbol Condition

Min T

Startup power supply voltage Vcc CH4 1.4 -- 7 V

Power supply voltage Vcc

Reference voltage output current I

VB pin output current I

Input voltage V

Control input voltage V

Output current Io

Oscillator f

Timing capacitor C

Timing resistor R

Soft start capacitor

C

Short detection capacitor C

VB pin capacitor C

Operating ambient temperature Ta -- -30 25 85

CH4 1.5 5.0 7 V

CH1 to CH3 1.8 5.0 7 V

VREF pin -1 -- 0 mA

OR

VB pin -0.5 -- 0 mA

B

IN1 to IN4 pins 0 -- Vcc-1.8 V

IN

CTL pin 0 -- 7 V

CTL

OUT pin (CH1 to CH3) -- 2 15 mA

OUT pin (CH4) 1 2 15 mA

OSC

T

T

-- 100 500 1000 kHz

-- 47 100 560 pF

-- 8.2 18 100

Cs CH1 to CH3 -- 0.027 1.0

CH4 -- 0.47 1.0

+IN6

SCP

VB

-- -- 0.1 1.0

-- 0.082 0.1 --

Max

Unit

kΩ

μF

μF

μF

μF

℃

2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: [phone] WWW: http://www.aimtron.com.tw
Fax: [phone] Email: [e-mail]

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