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MAX640

5V/3.3V/3V/可调、高效率、低I_Q、降压型DC-DC转换器

在较宽负载范围内具有低电源电流、高转换效率

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概述

说明

The MAX639/MAX640/MAX653 step-down switching regulators provide high efficiency over a wide range of load currents, delivering up to 225mA. A current-limiting pulse-frequency-modulated (PFM) control scheme gives the devices the benefits of pulse-width-modulated (PWM) converters (high efficiency at heavy loads), while using only 10µA of supply current (vs. 2mA to 10mA for PWM converters). The result is high efficiency over a wide range of loads.

The MAX639/MAX640/MAX653 input range is 4V to 11.5V, and the devices provide lower preset output voltages of 5V, 3.3V, and 3V, respectively. Or, the output can be user-adjusted to any voltage from 1.3V to the input voltage.

The MAX639/MAX640/MAX653 have an internal 1A power MOSFET switch, making them ideal for minimum-component, low- and medium-power applications. For increased output drive capability, use the MAX649/MAX651/MAX652 step-down controllers, which drive an external P-channel FET to deliver up to 5W.

MAX639、MAX640、MAX653：典型工作电路

MAX639、MAX640、MAX653：典型工作电路

关键特性

High Efficiency for a Wide Range of Load Currents
10µA Quiescent Current
Output Currents Up to 225mA
Preset or Adjustable Output Voltage:
- 5.0V (MAX639)
- 3.3V (MAX640)
- 3.0V (MAX653)
Low-Battery Detection Comparator
Current-Limiting PFM Control Scheme

应用

5V至3.3V转换
9V电池至5V、3.3V或3V转换
替代高效线性稳压器
便携式仪表与手持终端

参数规格

请查看具体的参数规格 Step-Down Switching Regulators (405)

Part Number

V_IN
(V)

V_IN
(V)

V_OUT1
(V)

V_OUT1
(V)

Preset V_OUT
(V)

Output Adjust. Method

I_OUT1
(A)

Switch Type

Power Good Signal

DC-DC Outputs

Package/Pins

Budgetary
Price

min

max

min

max

max

See Notes

MAX639

4

11.5

1.3

11.5

3

3.3

5

Preset

Resistor

0.225

Internal

Yes

1

$3.55 @1k

MAX640

3.3

$3.55 @1k

MAX653

3

$1.63 @1k

Pricing Notes:

价格仅供参考，用于同类产品的比较。所提供报价为美元，需要依汇率折合成人民币。该价格将因当地关税、税率和汇率而异。有关特定订购量和指定版本的报价和供货问题，请参考：价格与供货网站或与指定代理商联系。

设计资源

质量与环境

申请可靠性报告: MAX640

型号	生产流程	工艺	样本量	不合格	FIT @ 25°C	FIT @ 55°C	Material Composition

备注：通过技术手段对故障率进行汇总，并映射到相关的材料部件号。故障率与被测件的数量密切相关。

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封装信息