AT1369AR - Aimtron Technology - Datasheet.Directory

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: service@aimtron.com.tw

1

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

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 N-

Channel 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 step-

down 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.

Block Dia

g

ram

Aimtron reserves the right without notice to change this circuitry and specifications.

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: service@aimtron.com.tw

2

Pin Configuration

Ordering Information

Part number Package Marking

AT1369A SSOP20 AT1369AR

AT1369B SSOP20 AT1369BR

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

Pin Description

Symbol Pin No. Descript Symbol Pin

No.(A/B)

Descript

FB1 1 Inverting input to error

amplifier 1

SS2 11 Sotf-start 2

COMP1 2 Error amplifier1 output SCP 12 Short-Circuit protection

PVCC 3 Power blocks power

supply

CTL 13 Chip enable, high active

PDRV1 4 Output1 for Pch-MOSFET VCC 14 Control blocks power

supply

NDRV1 5 Output1 for Nch-MOSFET GND 15 Control blocks ground

NDRV2 6 Output2 for Nch-MOSFET RESET 16 Power Good indicator

PDRV2 7 Output2 for Pch-MOSFET IN1 17 VCC monitor voltage

adjustable input pin

PGND 8 Power blocks ground EI 18 Adjustable Reset input

COMP2 9 Error amplifier1 output 3V3 19 Output voltage 3.3V

FB2 10 Inverting input to error

amplifier 2

SS1 20 Sotf-start 1

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: service@aimtron.com.tw

3

Absolute Maximum Ratings

Rated ValueParameter Condition

Min. Max.

Unit

Power Supply Voltage — - +8 V

Source Average Current of PDRV1,NDRV1

PDRV2,NDRV2

—--50mA

Sink Average Current of PDRV1,NDRV1,

PDRV2,NDRV2

—-50mA

Source Peak Current of PDRV1,NDRV1,

PDRV2,NDRV2

— - -200 mA

Sink Peak Current of PDRV1,NDRV1,

PDRV2,NDRV2

—-200mA

Input Voltage to Error Amplifier — - 6.5 V

Continuous power dissipation SSOP20（Ta=+25℃） -560mW

Operating temperature — -30 +85 0C

Storage temperature — -55 +125 0C

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.

Recommended Operating Conditions

(Ta=+250C)

ValuesParameter Symbol

Min. Typ. Max.

Unit

Power supply voltage VCC 2.5 -- 7 Ｖ

Control input voltage VCTL 0--7V

Operating temperature TOP -20 +25 +85 °C

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: service@aimtron.com.tw

4

Electrical Characteristics

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

ValuesParameter Symbol Condition

Min. Typ. Max.

Unit

Input Supply Range VCC 2.5 -- 7.0 V

Quiescent Current ICC

Duty=50%,

fOSC=600KHz

PDRV/NDRV No Load

1.5 2.0 mA

Current in standby mode IST

CTL=0V 10 µA

Reference Voltage VREF

Ta =-20℃ to +85℃1.20 1.22 1.24 V

Reference Voltage

line-regulation VREF-Line

VCC=2.5V to 7.0V 110mV

Entire device

Rference Variation

with Temperature

Ta =-20℃ to +85℃0.5 1.5 %

Input Offset Voltage VIO 10 mV

Source Current IOH VCOMP = VREF -0.5V -1.0 -1.5 -2.0 mA

Sink Current IOL VCOMP = 0.5V 160 120 80 μA

Source current Variation

with temperature

Ta =-20℃ to +85℃20 %

Sink current Variation

with temperature

Ta =-20℃ to +85℃20 %

Unity Gain Bandwidth fT10.0 MHz

Common Mode Input

Voltage Range VCOM 0.2 1.5 V

Error amplifier

DC Open Loop Gain AV110 dB

fosc AT1369A 250 300 350 KHz

Frequency fosc AT1369B 500 600 700 KHz

High Level Voltage 1.0 V

Low Level Voltage 0.5 V

Variation with Power

Supply

Vcc=2.5V to 7V 2 %

Sawtooth wave

oscillator (OSC)

Variation with

temperature

Ta =-20℃ to +85℃7%

Charge Current of

SS1,2 ICSS1,2 -1.5 -1.0 -0.8 µA

Soft-Start Invalid threshold

voltage of SS1,2 1.0 V

Charge Current of

SCP ICSCP -1.7 -1.25 -1.0 µA

Short-Circuit Threshold Voltage of

SCP 0.9 V

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: service@aimtron.com.tw

5

Output source current Isource Duty≥95% PDRV=0V - -130 -80 mA

Output sink current Isink Duty≤5% PDRV=5V 65 100 mA

ROH PDRV=-15mA 10 20 Ω

PDRV1,2 Output

Block

Output ON resistor

ROL PDRV=15mA 10 20 Ω

Output source current Isource Duty≥95% NDRV=0V - -130 -80 mA

Output sink current Isink Duty≤5% NDRV=5V 65 100 mA

ROH NDRV=-15mA 10 20 Ω

NDRV1,2 Output

Block

Output ON resistor

ROL NDRV=15mA 10 20 Ω

VIH

Active mode VCC-

1VCC V

CTL input voltage

VIL

Standby mode 0VCC/

2V

Control Block

CTL input Current ICTL CTL=5.0V 20 µA

VCC reset ON voltage VRSTON1 4.10 4.20 4.30 V

VCC reset hysteresis VRSTON1 h

y

s-100 100 mV

3V3 reset ON voltage VRSTON2 2.94 3.0 3.06 V

3V3 reset hysteresis VRSTON2 h

y

s-60 60 mV

EI reset ON voltage VRSTON3 1.12 1.22 1.32 V

EI reset hysteresi VRSTON h

y

s-100 - 100 MV

Reset output voltage VOL IL =1mA 0.4 V

RESET Monitor

Block

Reset leakage current ILeak 2.0 µA

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: service@aimtron.com.tw

6

Typical Application Circuit: 3V3 and 2V Output

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: service@aimtron.com.tw

7

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

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

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: service@aimtron.com.tw

8

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

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

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: service@aimtron.com.tw

9

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: service@aimtron.com.tw

10

Vin=4 cell AA Battery

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: service@aimtron.com.tw

11

How to control CH1 and CH2 ON/OFF:

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: service@aimtron.com.tw

12

Package Outline 20-pin SSOP

MILLIMETERS

SYMBOL MIN TYP MAX

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

θ0°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: service@aimtron.com.tw

13

Reflow Condition (IR/Convection or VPR Reflow)

Reference JEDEC Standard J-STD-020A

Classification Reflow Profiles

Convection or

IR/Convction

VPR

Average Heating Rate(180°C to peak) 5°C/second max. 10°C/second max.

Preheat Temperature(125±20°C) 120 seconds max.

Temperature maintained above 180°C10~150 seconds

Time within 5°C of actual Peak

Temperature

10~20 seconds 60 seconds

Peak Temperature Range(Note 1) 219~225°C or

235~240°C

219~225°C or

235~240°C

Cooling Rate 6°C /second max. 10°C/second max.

Time 25°C to Peak Temperature 6 minutes max.

*1 The maximum peak temperatures for IR and VP reflow are depending on package dimensions.

Package Reflow Conditions

Pkg. Thickness ≥2.5mm

and all bags

Pkg. Thickness <2.5mm

and

Pkg. Volume ≥350 mm3

Pkg. Thickness <2.5mm

and

Pkg. Volume <350 mm3

Convection 219~225°CConvection 235~240°C

VPR 219~225°CVPR 235~240°C

IR/Convection 219~225°CIR/Convection 235~240°

C