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: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: [email protected]

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: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: [email protected]

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: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: [email protected]

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

-0.5V -1.0 -1.5 -2.0 mA

REF

= 0.5V

160 120 80

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 %

10.0 MHz

110 dB

KHz

1.0

0.5

7%

µA

1.0 V

µA

0.9 V

V

%

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: [email protected]

4

AT1369

Preliminary Product Information

2-Channel Synchronous Buck PWM Controller

with Power Good Reset

PDRV1,2 Output Block

NDRV1,2 Output Block

Control Block

Output source current I

Output sink current I

Output ON resistor

Output source current I

Output sink current I

Output ON resistor

CTL input voltage

CTL input Current I

source

R

source

R

V

CTL

Duty≥95% PDRV=0V

Duty≤5% PDRV=5V

sink

PDRV=-15mA

OH

PDRV=15mA

OL

Duty≥95% NDRV=0V

Duty≤5% NDRV=5V

sink

NDRV=-15mA

OH

NDRV=15mA

OL

Active mode VCC-

IH

Standby mode

IL

CTL=5.0V

- -130 -80 mA

65 100 mA

10 20

- -130 -80 mA

65 100 mA

10 20

1

0

VCC V

VCC/

20

Ω

V

2

µA

RESET Monitor Block

VCC reset ON voltage V

VCC reset hysteresis V

3V3 reset ON voltage V

3V3 reset hysteresis V

EI reset ON voltage V

EI reset hysteresi V

RSTON1

RSTON1 hys

RSTON2

RSTON2 hys

RSTON3

RSTON hys

Reset output voltage V

Reset leakage current I

OL

Leak

IL =1mA

4.10 4.20 4.30 V

-100 100 mV

2.94 3.0 3.06 V

-60 60 mV

1.12 1.22 1.32 V

-100 - 100 MV

0.4 V

2.0

µA

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: [email protected]

5

AT1369

Preliminary Product Information

2-Channel Synchronous Buck PWM Controller

with Power Good Reset

Typical Application Circuit: 3V3 and 2V 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: [email protected]

6

AT1369

Preliminary Product Information

2-Channel Synchronous Buck PWM Controller

with Power Good Reset

CH1:PDRV2 CH2:NDRV2 CH3:Output 2.0V/1A(AC ripple)

Fig1. Input 5V, Output 2.0V/1A

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: [email protected]

7

AT1369

Preliminary Product Information

2-Channel Synchronous Buck PWM Controller

with Power Good Reset

CH1:PDRV1 CH2:NDRV1 CH3:Output 3.3V/2A(AC ripple)

Fig2. Input 5V, Output 3.3V/2A

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: [email protected]

8

AT1369

Preliminary Product Information

2-Channel Synchronous Buck PWM Controller

with Power Good Reset

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: [email protected]

9

AT1369

Preliminary Product Information

2-Channel Synchronous Buck PWM Controller

with Power Good Reset

Vin=4 cell AA Battery

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: [email protected]

10

AT1369

Preliminary Product Information

2-Channel Synchronous Buck PWM Controller

with Power Good Reset

How to control CH1 and CH2 ON/OFF:

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: [email protected]

11

AT1369

Preliminary Product Information

2-Channel Synchronous Buck PWM Controller

with Power Good Reset

Package Outline 20-pin SSOP

SYMBOL

A 1.35 1.63 1.75 A1 0.10 0.15 0.25 A2 - - 1.50

b 0.20 - 0.30 C 0.18 - 0.25 D 8.56 8.66 8.74 E 5.79 5.99 6.20

E1 3.81 3.91 3.99

L 0.41 0.635 1.27

e - 0.635 -

y--0.076

θ 0° 8°

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: [email protected]

MILLIMETERS

MIN TYP MAX

12