AT1368 | DigiCamel IC Datasheet

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AT1368 ETC | Alldatasheet

Document overview

Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
PDF pages: 13

Technical content

Features

High efficiency (min. 90% On IO=300mA ~ 6 0 0 m A )
Using external P and N channel MOSFET
Supports for down and up/down Zeta conversion
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 1mA
Monitor the input voltage and 3V3 output
Input voltage: 2.5V ~7.0V

Applications

Slim-Type CD-ROM/DVD-ROM/CD-RW
Power Supply for portable devices
Main or Sub Power source foe notebook computers and peripherals. General Description The AT1368 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 AT1368 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 AT1368 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

1- 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 AT1368A SSOP16 AT1368AR AT1368B SSOP16 AT1368BR AT1368B TSSOP16 AT1368BP A : f o s c = 3 0 0 K H z B : f o s c = 6 0 0 K H z Pin Description Symbol Pin No. Descript Symbol Pin No.(A/B) Descript FB 1 Inverting input to error amplifier SCP 9 Short-Circuit protection COMP 2 Error amplifier output CTL 10 Chip enable, high active PVCC 3 Power blocks power supply NC 11 - PDRV 4 Output for Pch-MOSFET IN1 12 VCC monitor voltage adjustable input pin NDRV 5 Output for Nch-MOSFET RESET 13 Power Good indicator PGND 6 Power blocks ground IN2 14 3V3 output monitor adjustable input pin GND 7 Control blocks ground SS 15 Sotf-start VCC 8 Control blocks power supply 3V3 16 Output voltage 3.3V

1- 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 PDRV , NDRV —- - 5 0 m A Sink Average Current of PDRV , NDRV —- 5 0 m A Source Peak Current of PDRV , NDRV — - -200 mA Sink Peak Current of PDRV , NDRV —- 2 0 0 m A Input V oltage to Error Amplifier — - 6.5 V Continuous power dissipation SSOP16（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

1- 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 1.0 1.5 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 15 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 AT1368A 250 300 350 KHz Frequency fosc AT1368B 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 SS ICSS -1.0 µA Soft-Start Invalid threshold voltage of SS 1.0 V Charge Current of SS ICSS -1.25 µA Short-Circuit Threshold Voltage of SCP 1.0 V

1- 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 18 30 Ω PDRV Output Block Output ON resistor ROL PDRV=15mA 16 25 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 18 30 Ω NDRV Output Block Output ON resistor ROL NDRV=15mA 16 25 Ω VIH Active mode 1.5 VCC V CTL input voltage VIL Standby mode 00 . 8 VControl Block CTL input Current I CTL CTL=5.0V 20 µA VCC reset ON voltage V RSTON1 VCC rising 4.10 4.20 4.30 V VCC reset hysteresis V RSTON1 h ys VCC falling 100 mV 3V3 reset ON voltage V RSTON2 3V3 rising 2.94 3.0 3.06 V 3V3 reset hysteresis V RSTON2 h ys 3V3 falling 100 mV Reset output voltage V OL IL =1mA 0.4 V RESET Monitor Block Reset leakage current I Leak 2.0 µA

1- 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 Output L1: AT1368A: 22 µH/0.77A/104mΩ TDK-SLF6028T-220MR77 AT1368B: 10 µH/1A/74.5mΩ TDK-SLF6028T-100M1R0 R1: AT1368A: 100K AT1368B: 10K

1- 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

1- 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: 2V5 Output *1V8 Output: R4:9.8KΩ R5:38.7K Ω *Vin from 2.5V to 7V , disable SCP function

1- 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: Zeta converter 3V3 Output

1- 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:Reset CH2:SS CH3:Vout CH4:Vin Fig.1 Vout:3.3V/1A Vin:5V Start-Up Waveform Fig.2 Vout:2.5V/1A Vin:3.1V Start-Up Waveform

1- 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 16-pin SSOP MILLIMETERS INCHESSYMBOL MIN TYP MAX MIN TYP MAX b 0.20 - 0.30 0.008 - 0.012 C 0.18 - 0.25 0.007 - 0.010 θ 0° 8° 0° 8°

1- 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 16-pin TSSOP MILLIMETERS INCHESSYMBOL MIN TYP MAX MIN TYP MAX A2 - 1.00 1.05 - 0.039 0.041 θ 0° 8° 0° 8°

1- 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 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°C 10~150 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 a n d Pkg. Volume ≥350 mm3 Pkg. Thickness <2.5mm a n d Pkg. Volume <350 mm3 Convection 219~225°C Convection 235~240°C VPR 219~225°C VPR 235~240°C IR/Convection 219~225°C IR/Convection 235~240°C

Product Information

AT1368 specifications and overview.

Summary

1- Channel Synchronous Buck PWM Controller with Power Good Reset

Description

1- Channel Synchronous Buck PWM Controller with Power Good Reset

Source title AT1368 Datasheet(PDF) - List of Unclassifed Manufacturers

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