AT1391P - Aimtron Technology

AT1391

Preliminary Product Information

1- Channel Step-Down PWM Controller

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

• Using external P channel MOSFET

• Maximum Duty 100%

• Oscillation frequency 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 1mA

• Input voltage: 2.5V ~7.0V

Applications

• Power Supply for portable devices

General Description

The AT1391 provides complete control and

protection for a DC/DC converter optimized for

high-performance microprocessor applications. It

is designed to drive one P-Channel in a buck

topology. The AT1391 integrates all of the control,

output adjustment, 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 AT1391 is a family of low-noise

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.

AT1391

Preliminary Product Information

1- Channel Step-Down PWM Controller

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

AT1391P TSSOP8 AT1391P

AT1391P_PBF TSSOP8,PB-Free AT1391P, date code with one bottom line

AT1391P_GRE TSSOP8, Green AT1391P, date code with two bottom line

Pin Description

Symbol Pin No. Descript Symbol Pin

No.(A/B)

Descript

GND 1 Control blocks ground SS 5Sotf-start

VCC 2 Power blocks power

supply

FB 6 Error amplifier inverting

input

SCP 3 Short-Circuit protection COMP 7 Error amplifier output

CTL 4 Chip enable, high active OUT 8 Output for Pch-MOSFET

AT1391

Preliminary Product Information

1- Channel Step-Down PWM Controller

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 — - +7 V

Source Average Current of OUT — - -50 mA

Sink Average Current of OUT — - 50 mA

Source Peak Current of OUT — - -200 mA

Sink Peak Current of OUT — - 200 mA

Input Voltage to Error Amplifier — - 6.5 V

Continuous power dissipation TSSOP8（Ta=+25℃） -500mW

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 -- 6 Ｖ

Control input voltage VCTL 0--6V

Operating temperature TOP -20 +25 +85 °C

AT1391

Preliminary Product Information

1- Channel Step-Down PWM Controller

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 -- 6.0 V

Quiescent Current ICC

Duty=50%,

fOSC=600KHz

PDRV/NDRV No Load

1.0 1.5 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 6.0V 15mV

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

Frequency fosc 500 600 700 KHz

High Level Voltage 1.0 V

Low Level Voltage 0.5 V

Variation with Power

Supply

Vcc=2.5V to 6V 2 %

Sawtooth wave

oscillator (OSC)

Variation with

temperature

Ta =-20℃ to +85℃7%

Charge Current of

SS ICSS -1.0 µA

Soft-Start Invalid threshold

voltage of SS 1.0 V

Charge Current of

SS ICSCP -1.5 -1.25 -1.0 µA

Short-Circuit Threshold Voltage of

SCP 0.8 0.9 1.0 V

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

AT1391

Preliminary Product Information

1- Channel Step-Down PWM Controller

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

ROH OUT=-15mA 18 30 Ω

Output ON resistor

ROL OUT=15mA 16 25 Ω

VIH Active mode 2.0 VCC V

CTL input voltage

VIL Standby mode 00.5V

Control Block

CTL input Current ICTL CTL=5.0V 20 µA

Application Circuit

AT1391

Preliminary Product Information

1- Channel Step-Down PWM Controller

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

AT1391

Preliminary Product Information

1- Channel Step-Down PWM Controller

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

AT1391

Preliminary Product Information

1- Channel Step-Down PWM Controller

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

Small Outline 8-pin TSSOP

INCHES MILLIMETERS

SYMBOL MIN MAX MIN MAX NOTES

A 0.114 0.122 2.90 3.10 -

B 0.169 0.177 4.30 4.50 -

C 0.244 0.260 6.20 6.60 -

D 0.026 BSC 0.65 BSC -

E 0.010 0.012 0.25 0.30 -

F 0.002 0.006 0.05 0.15 -

H 0.041 0.047 1.05 1.20 -

K 0.005 BSC 0.127 BSC -

M 0.020 0.028 0.50 0.70

α00800080-

AT1391

Preliminary Product Information

1- Channel Step-Down PWM Controller

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

Reflow Condition

1.Infrared-Ray Reflow

2.Infrared-Ray Reflow(Pb-free)