AT1369 | DigiCamel IC Datasheet

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AT1369 AIMTRON | Alldatasheet

Document overview

Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
PDF pages: 12

Technical content

Features

High efficiency (min. 90% On IO=300mA ~ 6 0 0 m A )
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 micropro cessor 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 Diagram Aimtron reserves the right without notice to change this circuitry and specifications.

Preliminary Product Information 2-Channel Synchronous Buck PWM Controller with Power Good Reset Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: service@aimtron.com.tw 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 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

Preliminary Product Information 2-Channel Synchronous Buck PWM Controller with Power Good Reset Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: service@aimtron.com.tw Absolute Maximum Ratings Rated ValueParameter Condition Min. Max. Unit Power Supply V oltage — - +8 V Source Average Current of PDRV1,NDRV1 PDRV2,NDRV2 —- - 5 0 m A Sink Average Current of PDRV1,NDRV1, PDRV2,NDRV2 —- 5 0 m A Source Peak Current of PDRV1,NDRV1, PDRV2,NDRV2 — - -200 mA Sink Peak Current of PDRV1,NDRV1, PDRV2,NDRV2 —- 2 0 0 m A Input V oltage to Error Amplifier — - 6.5 V Continuous power dissipation SSOP20（Ta=+25℃） -5 6 0m W 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 specificatio ns 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 V CC 2.5 -- 7 Ｖ Control input voltage V CTL 0- -7 V Operating temperature T OP -20 +25 +85 °C

Preliminary Product Information 2-Channel Synchronous Buck PWM Controller with Power Good Reset Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: service@aimtron.com.tw

Electrical Characteristics

(VCC = 5V,Ta =+25℃ , unless otherwise noted. ) ValuesParameter Symbol Condition Min. Typ. Max. Unit Input Supply Range V CC 2.5 -- 7.0 V Quiescent Current I CC Duty=50%, fOSC=600KHz PDRV/NDRV No Load 1.5 2.0 mA Current in standby mode I ST CTL=0V 10 µA Reference Voltage V REF Ta =-20℃ to +85 ℃ 1.20 1.22 1.24 V Reference Voltage line-regulation VREF-Line VCC=2.5V to 7.0V 11 0 m V Entire device Rference Variation with Temperature Ta =-20℃ to +85 ℃ 0.5 1.5 % Input Offset V oltage V IO 10 mV Source Current I OH VCOMP = VREF -0.5V -1.0 -1.5 -2.0 mA Sink Current I OL VCOMP = 0.5V 160 120 80 μA Source current Variation with temperature Sink current Variation with temperature Unity Gain Bandwidth f T 10.0 MHz Common Mode Input Voltage Range VCOM 0.2 1.5 V Error amplifier DC Open Loop Gain A V 110 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 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

Preliminary Product Information 2-Channel Synchronous Buck PWM Controller with Power Good Reset Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: service@aimtron.com.tw Output source current I source Duty≥95% PDRV=0V - -130 -80 mA Output sink current I sink 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 I source Duty≥95% NDRV=0V - -130 -80 mA Output sink current I sink 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-

1 VCC V

2 VControl Block

CTL=5.0V 20 µA VCC reset ON voltage V RSTON1 4.10 4.20 4.30 V VCC reset hysteresis V RSTON1 h ys -100 100 mV 3V3 reset ON voltage V RSTON2 2.94 3.0 3.06 V 3V3 reset hysteresis V RSTON2 h ys -60 60 mV EI reset ON voltage V RSTON3 1.12 1.22 1.32 V EI reset hysteresi V RSTON hys -100 - 100 MV Reset output voltage V OL IL =1mA 0.4 V RESET Monitor Block Reset leakage current I Leak 2.0 µA

Preliminary Product Information 2-Channel Synchronous Buck PWM Controller with Power Good Reset Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: service@aimtron.com.tw Typical Application Circuit: 3V3 and 2V Output

Preliminary Product Information 2-Channel Synchronous Buck PWM Controller with Power Good Reset Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: service@aimtron.com.tw CH1:PDRV2 CH2:NDRV2 CH3:Output 2.0V/1A(AC ripple) Fig1. Input 5V , Output 2.0V/1A

Preliminary Product Information 2-Channel Synchronous Buck PWM Controller with Power Good Reset Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: service@aimtron.com.tw CH1:PDRV1 CH2:NDRV1 CH3:Output 3.3V/2A(AC ripple) Fig2. Input 5V , Output 3.3V/2A

Preliminary Product Information 2-Channel Synchronous Buck PWM Controller with Power Good Reset Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: service@aimtron.com.tw

Preliminary Product Information 2-Channel Synchronous Buck PWM Controller with Power Good Reset Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: service@aimtron.com.tw Vin=4 cell AA Battery

Preliminary Product Information 2-Channel Synchronous Buck PWM Controller with Power Good Reset Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: service@aimtron.com.tw How to control CH1 and CH2 ON/OFF:

Preliminary Product Information 2-Channel Synchronous Buck PWM Controller with Power Good Reset Tel: 886-3-563-0878 WWW: http://www.aimtron.com.tw Fax: 886-3-563-0879 Email: service@aimtron.com.tw Package Outline 20-pin SSOP MILLIMETERSSYMBOL 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 . 0 7 6 θ 0° 8°

Product Information

AT1369 specifications and overview.

Summary

2-Channel Synchronous Buck PWM Controller with Power Good Reset

Description

2-Channel Synchronous Buck PWM Controller with Power Good Reset

Source title AT1369 Datasheet(PDF) - Aimtron Technology

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