SC122EVB

更新时间： 2024-11-20 09:33:55

品牌	Logo	应用领域
商升特 - SEMTECH		转换器升压转换器
页数	文件大小	规格书
13页	197K
描述
Low Voltage Synchronous Boost Converter

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SC122EVB 数据手册

SC122

Low Voltage Synchronous

Boost Converter

POWER MANAGEMENT

Features

Description

Input voltage — 0.7V to 1.6V

Minimum start-up voltage — 0.85V

Output voltage ﬁxed at 3.3V

Peak input current limit — 350mA typically

Output current 95mA at V_IN= 1.6V, 50mA at V_IN= 0.9V

Eﬃciency up to 80%

The SC122 is a high efficiency, low noise, synchronous

step-up DC-DC converter. It produces a ﬁxed 3.3V output

from a single cell alkaline or NiMH battery. It features an

internal 1.2A switch and synchronous rectiﬁer to achieve

high eﬃciency and to eliminate the need for an external

Schottky diode.

Internal synchronous rectiﬁer

The SC122 operates exclusively in voltage-hysteretic

power save mode (PSAVE) for high eﬃciency under light

load conditions. It features anti-ringing circuitry for

reduced EMI in noise sensitive applications. While dis-

abled, the output remains in a high impedance state to

preserve the charge on the output capacitor. This permits

ultra-low idle quiescent currents in applications in which

the SC122 can be periodically enabled by an external con-

troller to recharge the output capacitor.

Switching frequency — 1.2MHz

Power save (voltage hysteretic) control

Anti-ringing circuit

Operating supply current (measured at OUT) — 40μA

No forward conduction path during shutdown

MLPD-UT-6 1.5 × 2.0 × 0.6 (mm) package

Lead-free and halogen-free

WEEE and RoHS compliant

Applications

Low quiescent current is obtained despite a high 1.2MHz

operating frequency. Small external components and the

space saving MLPD-UT-6, 1.5×2.0×0.6 (mm) package,

make this device an excellent choice for small handheld

applications that require the longest possible battery life.

Electric toothbrushes

Personal medical products

Single-cell alkaline, NiCd, or NiMH applications

Typical Application Circuit

Single

Cell

OUT

3.3V

(1.2V)

GND

C_IN

C_OUT

SC122

February 1, 2010

12 3 4 5 6 7...13

中文翻译

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