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HM1531 Datasheet(PDF) 1 Page - Shenzhen Huazhimei Semiconductor Co., Ltd

Part No. HM1531
Description  HM1531 High Efficiency DC-DC Boost Regulator
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Manufacturer  HMSEMI [Shenzhen Huazhimei Semiconductor Co., Ltd]
Direct Link  http://www.hmsemi.com/
Logo HMSEMI - Shenzhen Huazhimei Semiconductor Co., Ltd

HM1531 Datasheet(HTML) 1 Page - Shenzhen Huazhimei Semiconductor Co., Ltd

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HM1531 High Efficiency
DC-DC Boost Regulator
Ver1.1
Feb 22,2013
1
Features
Min1.6V Startup @1mA Load
600mV Feedback Voltage
550KHz Internal Oscillator
Soft Startup: 10mS Typical
Peak Current Programmable by
Bottom Sensing Resistor
300μA Typical Iq
Internal PWM/PFM Auto Mode Switching
Up to 90% Efficiency
External Enable
Power OFF Current<1μA
Over Voltage Protection
140℃ Thermal Shut Down, 20℃ Hysteresis
Applications
USB Charger
General Description
The HM1531 using the external NMOSFET. It
is a high efficiency boost converter with
600mV feedback voltage. A switching
frequency of 550KHz minimizes solution
footprint by allowing the use of tiny low profile
inductors and ceramic capacitors. The
current mode PWM/PFM design is internally
compensated, and the device has a 1.6V
startup voltage with 1mA load. It needs few
external components, only inductance,
resistance and capacitance can meet the
driving capacity.
Block Diagram


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