基于ADI ADP230x 的1.2A超小型电流模式DC电源

2011-05-15 09:51:36来源: 互联网 关键字:小型  电流  模式  电源

ADI 公司的ADP2300/ADP2301是集成了功率MOSFET的小型紧凑固定频率电流模式降压DC/DC电源稳压器, 输入电压VIN从3V到20V,输出电压从0.8V到0.85xVIN,效率高达91%,可选择开关频率700 kHz (ADP2300) 或1.4 MHz (ADP2301) ,超小型6引脚TSOT封装,主要用在系统内部电源转换,通信和网络设备,工业和仪表,保健和医疗设备以及消费类电子产品.本文介绍ADP2300/ADP2301主要特性,方框图,以及多种应用电路.

The ADP2300/ADP2301 are compact, constant-frequency, current-mode, step-down dc-to-dc regulators with integrated power MOSFET. The ADP2300/ADP2301 devices run from input voltages of 3.0 V to 20 V, making them suitable for a wide range of applications. A precise, low voltage internal reference makes these devices ideal for generating a regulated output voltage as low as 0.8 V, with ±2% accuracy, for up to 1.2 A load current.

There are two frequency options: the ADP2300 runs at 700 kHz, and the ADP2301 runs at 1.4 MHz. These options allow users to make decisions based on the trade-off between efficiency and total solution size. Current-mode control provides fast and stable line and load transient performance. The ADP2300/ADP2301 devices include internal soft start to prevent inrush current at power-up. Other key safety features include short-circuit protec-tion, thermal shutdown (TSD), and input undervoltage lockout (UVLO). The precision enable pin threshold voltage allows the ADP2300/ADP2301 to be easily sequenced from other input/ output supplies. It can also be used as a programmable UVLO input by using a resistive divider.

The ADP2300/ADP2301 are available in a 6-lead TSOT package and are rated for the −40℃ to +125℃ junction temperature range.

ADP2300/ADP2301主要特性:

1.2 A maximum load current

±2% output accuracy over temperature range

Wide input voltage range: 3.0 V to 20 V

700 kHz (ADP2300) or 1.4 MHz (ADP2301) switching frequency options

High efficiency up to 91%

Current-mode control architecture

Output voltage from 0.8 V to 0.85 × VIN

Automatic PFM/PWM mode switching

Precision enable pin with hysteresis

Integrated high-side MOSFET

Integrated bootstrap diode

Internal compensation and soft start

Minimum external components

Undervoltage lockout (UVLO)

Overcurrent protection (OCP) and thermal shutdown (TSD)

ADIsimPower™ online design tool

Available in ultrasmall, 6-lead TSOT package

ADP2300/ADP2301应用:

LDO replacement for digital load applications

Intermediate power rail conversion

Communications and networking

Industrial and instrumentation

Healthcare and medical

Consumer

图1。ADP2300/ADP2301功能方框图

图2。ADP2300/ADP2301设计案例电路图

推荐的输出电流1.2A外接元件表:



图3.推荐的ADP2300/ADP2301PCB布局图

典型应用电路图

图4.ADP2300—700 kHz 典型应用(带外接使能): VIN = 12 V, VOUT = 1.2 V/1.2 A

图5.ADP2300—700 kHz 典型应用(带外接使能): VIN = 12 V, VOUT = 1.8 V/1.2 A


图6.ADP2300—700 kHz 典型应用(带外接使能): VIN = 12 V, VOUT = 2.5V/1.2 A

图7.ADP2301—1.4MHz 典型应用(带可编7.8V起动输入电压): VIN = 12 V, VOUT = 3.3 V/1.2 A

图8.ADP2301—1.4Hz 典型应用(带外接使能): VIN = 12 V, VOUT = 5.0 V/1.2 A

图9.ADP2301—1.4Hz 典型应用(带外接使能): VIN = 18 V, VOUT = 5.0 V/1.2 A

图10.ADP2301—1.4Hz 典型应用(带外接使能): VIN = 9 V, VOUT = 3.3 V/1.2 A

图11.ADP2301—1.4Hz 典型应用(带外接使能): VIN = 5 V, VOUT = 1.8 V/1.2 A

关键字:小型  电流  模式  电源

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