Aimtron AT1369 User Manual

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AT1369

Preliminary Product Information

2-Channel Synchronous Buck PWM Controller

with Power Good Reset

Features

• High efficiency (min. 90% On IO=300mA
~600mA)

• Using external P and N channel MOSFET

• Maximum Duty 100%

• Oscillation frequency 300KHz or 600KHz

• Soft Start by an external capacity

• Output voltage accuracy ±2%

• Built-in ON/OFF Function

• Built-in Short-circuit Protection

• Stand-by current max. 10µA

• Quiescent Current 1.5mA

• Built-in Power Good reset circuit

• Input voltage: 2.5V ~7.0V

Applications

• Slim-Type CD-ROM/DVD-ROM/CD-RW

• Power Supply for portable devices

Block Diagram

General Description

The AT1369 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 N­Channel MOSFETs in a synchronous-rectified
buck topology. The AT1369 integrates all of the
control, output adjustment, monitoring and
protection functions 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
AT1369 is a family of low-noise synchronous step­down 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.

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

1

AT1369

Preliminary Product Information

2-Channel Synchronous Buck PWM Controller

with Power Good Reset

Pin Configuration

Ordering Information

Part number Package Marking

AT1369AR SSOP20 AT1369AR

AT1369AR_GRE SSOP20,Green AT1369AR, Date Code with one bottom line

AT1369BR SSOP20 AT1369BR

AT1369BR_GRE SSOP20,Green AT1369BR, Date Code with one bottom line

A: fosc =300KHz B: fosc =600KHz

Pin Description

Symbol Pin No. Descript Symbol Pin

FB1

COMP1

PVCC

PDRV1

NDRV1
NDRV2
PDRV2

PGND

COMP2

FB2

1 Inverting input to error

amplifier 1
2 Error amplifier1 output
3 Power blocks power

supply
4 Output1 for Pch-MOSFET

5 Output1 for Nch-MOSFET
6 Output2 for Nch-MOSFET
7 Output2 for Pch-MOSFET

8 Power blocks ground
9 Error amplifier1 output

10 Inverting input to error

amplifier 2

SS2

SCP

CTL

VCC

GND

RESET

IN1

EI

3V3

SS1

Descript

No.(A/B)

11 Sotf-start 2

12 Short-Circuit protection
13 Chip enable, high active

14 Control blocks power

supply
15 Control blocks ground
16 Power Good indicator
17 VCC monitor voltage

adjustable input pin
18 Adjustable Reset input
19 Output voltage 3.3V

20 Sotf-start 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]

2

AT1369

Preliminary Product Information

2-Channel Synchronous Buck PWM Controller

with Power Good Reset

Absolute Maximum Ratings

Rated ValueParameter Condition

Unit

Min. Max.

Power Supply Voltage — - +8 V
Source Average Current of PDRV1,NDRV1

—--50mA
PDRV2,NDRV2
Sink Average Current of PDRV1,NDRV1,

—-50mA
PDRV2,NDRV2
Source Peak Current of PDRV1,NDRV1,

— - -200 mA
PDRV2,NDRV2
Sink Peak Current of PDRV1,NDRV1,

—-200mA
PDRV2,NDRV2
Input Voltage to Error Amplifier — - 6.5 V

Continuous power dissipation

SSOP20（Ta=+25℃）

Operating temperature — -30 +85
Storage temperature — -55 +125

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.

-560mW

0

C

0

C

Recommended Operating Conditions

(Ta=+250C)

Va lu esParameter Symbol

Min. Typ. Max.

Power supply voltage V
Control input voltage V

Operating temperature T

CC

CTL

OP

2.5 -- 7
0--7V

-20 +25 +85 °C

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

Unit

Ｖ

AT1369

Preliminary Product Information

2-Channel Synchronous Buck PWM Controller

with Power Good Reset

Electrical Characteristics

(VCC = 5V,Ta =+25℃ , unless otherwise noted. )

Entire device

Error amplifier

Sawtooth wave
oscillator (OSC)

Soft-Start

Short-Circuit

Input Supply Range V

Quiescent Current I

Current in standby mode I

Reference Voltage V

Reference Voltage
line-regulation

V

REF-Line

Rference Variation
with Temperature

Input Offset Voltage V
Source Current I
Sink Current I
Source current Variation

with temperature
Sink current Variation
with temperature
Unity Gain Bandwidth f
Common Mode Input

Voltage Range

V

DC Open Loop Gain A

fosc

Frequency

fosc

High Level Voltage

Low Level Voltage

Variation with Power
Supply
Variation with
temperature

Charge Current of
SS1,2

I

CSS1,2

Invalid threshold
voltage of SS1,2

Charge Current of
SCP

I

Threshold Voltage of
SCP

Min. Typ. Max.

CC

2.5 -- 7.0 V

Duty=50%,
f

=600KHz

OSC

CC

PDRV/NDRV No Load
CTL=0V

ST

Ta =-20℃ to +85℃

REF

1.20 1.22 1.24 V

VCC=2.5V to 7.0V

Ta =-20℃ to +85℃

IO

V

= V

OH

OL

V

COMP

COMP

-0.5V -1.0 -1.5 -2.0 mA

REF

= 0.5V

160 120 80

Ta =-20℃ to +85℃

Ta =-20℃ to +85℃

T

COM

V

0.2 1.5 V

AT1369A 250 300 350

AT1369B 500 600 700

Vcc=2.5V to 7V 2

Ta =-20℃ to +85℃

-1.5 -1.0 -0.8

CSCP

-1.7 -1.25 -1.0

Va lu esParameter Symbol Condition

Unit

1.5 2.0 mA

10

µA

110mV

0.5 1.5 %

10 mV

μA

20 %

20 %

10.0 MHz

110 dB

KHz

KHz

1.0

0.5

7%

µA

1.0 V

µA

0.9 V

V

V

%

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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