Datasheet > AS1337_1

AS1337_1

更新时间： 2022-10-11 11:46:20

品牌	Logo	应用领域
艾迈斯 - AMSCO		转换器升压转换器
页数	文件大小	规格书
14页	923K
描述
200mA, DC-DC Step-Up Converter with Buck Mode

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Datasheet

AS1337

200mA, DC-DC Step-Up Converter with Buck Mode

1 General Description

2 Key Features

ꢀ Input Voltage Range: 0.65V to 4.5V

The AS1337 is a synchronous, fixed frequency,

highefficiency DC-DC boost converter capable of

supplying 3.3V @ 200mA from two AA Cells. Com-

pact size and minimum external parts require-

ments make these devices perfect for modern

portable devices. The AS1337 offers automatic

powersave mode to increase efficiency at light

loads. For input voltages higher than VOUT the

AS1337 will switch in a step down mode, so that a

Buck Boost function is realized.

ꢀ Low Start-Up Voltage: 0.85V

ꢀ Output Voltage Range: 2.5V to 5.0V

ꢀ Delivers 200mA @ 3.3V (from two AA Cell)

ꢀ up to 97% Efficiency

ꢀ High-Speed Fixed-Frequency: 1.2MHz

ꢀ Single-Cell Operation

ꢀ Internal PMOS Synchronous Rectifier

ꢀ Automatic Powersave Operation

ꢀ Anti-Ringing Control Minimizes EMI

ꢀ Logic Controlled Shutdown (< 1µA)

ꢀ TDFN (3x3mm) 8-pin Package

The AS1337A offers a shutdown mode where the

battery is connected directly to the output enabling

the supply of real-time-clocks or memories.

In the shutdown mode of the AS1337B the battery

is disconnected and the output is discharged.

Table 1. Standard Products

Model

Operation Mode

AS1337A

Battery Connected in Shutdown

Battery Disconnected in Shutdown

and Output Discharged

3 Applications

AS1337B

The AS1337 is ideal for low-power applications

where ultra-small size is critical as in medical diag-

nostic equipment, hand-held instruments, pagers,

digital cameras, remote wireless transmitters, MP3

players, LCD bias supplies, cordless phones, GPS

receivers, and PC cards.

The AS1337 offers a POK (open-drain) feature

which detects output power fail of 10%.

The AS1337 is available in a TDFN (3x3mm) 8-pin

package.

Figure 1. AS1337 - Typical Application Diagram – Dual Cell to 3.3V Synchronous Boost Converter

4.7µH

3.6V

Buck Mode

VOUT = 3.3V

VOUT

VIN = 2xAA

1.6V to 3.6V

C_OUT

22µF

=3.3V

OUT

VIN

C_IN

10µF

Curve

AS1337

Off

Boost Mode

POK

GND

PGND

1.6V

www.austriamicrosystems.com/DC-DC_Step-Up/AS1337

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