AS1345 datasheet(14/29 Pages) AMSCO

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AS1345 – 14

ams Datasheet, Confidential: 2013-Nov [1-51]

De tail ed De sc rip t ion

The AS1345 is a compact step-up DC-DC converters that

operates from a 2.9V to 5.0V supply. Consuming only 25μA of

Quiescent current. These devices include an internal MOSFET

switch with a low on-resistance. A true shutdown feature

disconnects the battery from the load and reduces the supply

current to 0.05μA (typ). These DC-DC converters are available

with either a fixed output or are adjustable up to 18V. Four

current-limit options are available: 100mA, 200mA, 350mA and

500mA.

Figure 17:

Typical Application Diagram

Modes of Operation

The AS1345 features an advanced current-limited control

scheme operating in hysteretic mode. An internal P-channel

MOSFET switch connects VDD to SWIN to provide power to the

inductor when the converter is operating. When the converter

is shut down, this switch disconnects the input supply from the

inductor (see Figure 17). To boost the output voltage an

N-channel MOSFET switch turns on and allows current to ramp

up in the inductor. Once this current reaches the current limit,

the switch turns off and the inductor current flows through D1

to supply the output. The switching frequency varies

depending on the load and input voltage and can be up to

10kHz.

Detailed Description

AS1345

SWIN

SWOUT

VDD

POK

GND

10uH to 22uH

10uF

100k

VDD = 2.9V to 5.0V

47pF

1uF to 10uF

OFF

Vout = 5.0V to 18V

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