AIM AT1382A Datasheet

AT1382A

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.

Applications

• Digital Cameras

• CCD Imaging Devices

• Camcorders

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/step­down 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.

Pin Assignment

Ordering Information

Part number Package Marking

AT1382A LQFP48 AT1382AF

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]

1

AT1382A

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

AT1382A

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

AT1382A

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]

4

AT1382A

4-Channel DC-DC Converter for DSC

Electrical Characteristics

(Ta=25℃, VCC=PVCC=5V)

Parameter Symbol Condition

Reference voltage block [REF]

Measure result

Min. Typ. Max.

Unit

Reference voltage V

Output voltage temperature

△V

stability

/V

REF

REF

Ta = -30℃ to 85℃

REF

0.88 0.90 0.92 V

-0.5-%

Input stability Line VCC=1.8V to 7V -10 - 10 mV

Load stability Load VREF=0mA to –1mA -10 - 10 mV

Shout circuit output current I

VREF=0.7V -20 -5 -1 mA

OSC

Under voltage lockout block [U.V.L.O]

Threshold voltage(CH1~CH3) V

Hysteresis width(CH1~CH3) V

Reset voltage(CH1~CH3) V

CH4 Pre-OSC change to Main­OSC threshold

V

TH

H

RST

TH2

1.5 1.6 1.7 V

-0.2-V

1.6 1.7 1.8 V

-1.7-V

Soft start block [CS]

Input standby voltage V

Charge current I

STB

CS

-50100mV

-6.0 -5.0 -4.0

μA

Short circuit detection block [SCP]

Threshold voltage V

Input standby voltage V

Input latch voltage V

Input source current I

TH

STB

I

CSCP

0.65 0.70 0.75 V

-50100mV

-50100mV

-1.4 -1.0 -0.6

μA

Triangular wave oscillator block [OSC]

Oscillator frequency f

Frequency stability for voltage

Frequency stability for
temperature

OSC

△f

/fdv

△f

/fdt

CT=100pF, RT=20kΩ

VCC=1.8V to 7V - 1 10 %

Ta=-30℃ to 85℃

450 500 550 kHz

-1-%

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]

5

AT1382A

4-Channel DC-DC Converter for DSC

Parameter Symbol Condition

Measure result

Min. Typ. Max.

Unit

Error amplifier block [Error Amp](CH1~CH4)

Threshold voltage V

VT temperature stability

△V

Input bias current I

Voltage gain A

FB=0.9V 0.69 0.70 0.71 V

TH

Ta = -30℃ to 85℃

T/VT

IN=0V -320 -80 - nA

B

DC - 100 - dB

V

-0.5-%

Frequency bandwidth BW AV=0dB - 10 - MHz

Output voltage

Output source current I

Output sink current I

V

OH

V

OL

SOURCE

SINK

FB=0.5V - -4.0 -1.0 mA

FB=0.5V 70 140 -

1.3 1.4 - V

-50200mV

μA

Short detect comparator [SCP Comp]

Threshold voltage

Input bias current I

V

CH1 to CH4 0.65 0.7 0.75 V

TH

IN=0V -320 -80 - nA

B

PWM Comp. [PWM Comp]

V

Duty = 0 % 0.25 0.3 - V

Threshold voltage(CH4)

Threshold voltage(CH1~3)

Input current I

T0

V

V

Duty = 100 % - 0.75 0.80 V

Tmax

V

Duty = 0 % 0.20 0.25 -

T0

Duty = 100 % - 0.65 0.70

Tmax

DTC=0.4V -1.0 -0.3 -

DTC

μA

Output block (CH1,2) [Pin 39,41]

Output source current I

Output sink current I

Output ON resistor

SOURCE

SINK

R

OH

R

OL

Duty≧95%, OUT=0V

Duty≦5%, OUT=5V

OUT = -15mA - 18 30

OUT = 15mA - 16 25

- -130 -80 mA

65 100 - mA

Ω

Ω

Output block (CH1 to CH3) [Pin 40,42,47]

Output source current I

Output sink current I

Output ON resistor

SOURCE

SINK

R

OH

R

OL

Duty≧95%, OUT=0V

Duty≦5%, OUT=5V

OUT = -15mA - 18 30

OUT = 15mA - 16 25

- -130 -80 mA

65 100 - mA

Ω

Ω

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]

6

AT1382A

yp

4-Channel DC-DC Converter for DSC

Parameter Symbol Condition

Measure result

Min. T

Max.

Unit

Output block (CH4) [Pin 48]

Output source current I

Output sink current I

Output ON resistor

SOURCE

SINK

R

OH

R

OL

Duty≧95%, OUT=0V

Duty≦5%, OUT=5V

OUT = -15mA - 9 15

OUT = 15mA - 9 15

- -260 -160 mA

150 260 - mA

Ω

Ω

Control block [CTL]

V

Active mode 1.3 - 7 V

CTL input voltage

CTL1 to CTL4 input voltage

Input current I

IH

V

Standby mode 0 - 0.8 V

IL

V

Active mode 1.3 - 7 V

IH

V

Standby mode 0 - 0.8 V

IL

CTL = 5V - 5 20

CTL

μA

Analog gain block [AO,AI]

AI feedback regulation voltage VAO=V

-1.22V 1.20 1.22 1.24 V

OUT

AI input common-mode range -0.1 - 1.3 V

AI input current VAI=1.32V - - 100 nA

AI to AO voltage gain 70 100 140 V/V

AO output sink current VAI=1V, VAO=2V 0.5 2.5 - mA

AO output source current VAI=1.5V, VAO=2V 0.5 2.5 - mA

ENLD enable V

ENLD disable V

Active mode 1.2 - 7 V

IH

Standby mode 0 - 0.8 V

IL

Low battery detect block [LBI, LBO]

LBI detect threshold 1.20 1.22 1.24 V

Detect Hysteresis -50 +50 mV

LBO output voltage low Isink=1mA - - 0.4 V

LBO output high leakage

LBO

=5V

-0.011

μA

V

General

Standby current

Icss CTL=0V - - 10

Icss(o) CTL=0V - - 10

μA

μA

CTL=CTL1=CTL2=C

Power supply current Icc

TL3=CTL4=ENLD="

-36mA

H"

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]

7

AT1382A

4-Channel DC-DC Converter for DSC

Typical Application

A.

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]

8