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HM4033

PFM Step-up Battery Charger Controller IC

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HM4033

PFM Step-up Battery Charger Controller IC

HM4033

General Description:

The +0 is a step up battery charger controller

IC which operates from an input voltage of 4V to

28V. The +0 includes on-chip reference

voltage, +5V voltage regulator, inductor current

sensing, battery voltage monitoring and N-channel

MOSSFET driving blocks, etc, which makes the

+0 easy to be used with few external

components.

The +0 enter charging mode on power up, the

external N-channel MOSFET is turned on, when the

inductor current rises to the upper limit, the

N-channel MOSFET is turned off, then inductor

current begins to fall, the energy stored in inductor is

transferred to the battery. When inductor current falls

to the lower limit, the external N-channel MOSFET

is turned on again, and a new cycle starts. Battery

voltage is feedback to FB pin via the external resistor

divider, when the voltage at FB pin reaches

1.205V(Typical), the charging is terminated, the

external N-channel MOSFET remains off until the

voltage at FB pin decreases to recharge threshold,

The maximum switching frequency of +0 is

1MHz.

+0 adopts 6-pin SOT23 package.

Applications:

 Lithium ion battery charger

 LiFePO4 battery charger

 Lead-Acid battery charger

 Standalone battery charger

Features:

 Input Voltage Range：4V to 28V

 Inductor Current Sensing

 Battery Voltage Monitoring

 Up to 1MHz Switching Frequency

 Automatic Recharge

 Up to 25W Output Power

 On-Chip Voltage Regulator: 5V，5mA

 Operating Temperature Range：－40℃ to 85℃

 6-Pin SOT23 Package

 Lead-free，rohs-Compliant，Halogen-free

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