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PS5005 Datasheet Preview

PS5005 Datasheet

Step-up DC/DC Converter

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PS5005
High Efficiency, Low Voltage
Step-up DC/DC Converter
GENERAL DESCRIPTION
The PS5005 is a compact, high efficiency, and low voltage step-up DC/DC converter
with an Adaptive Current Mode PWM control loop. It comprises of an error amplifier, a ramp generator, a
PWM comparator, a switch pass element and the driver. It provides stable and high
efficient operation over a wide range of load currents without external compensation. The below 1V
start-up input voltage makes PS5005 suitable for single battery cell applications. The
built-in power transistor is able to provide up to 300mA output current while working
under Li-Battery Supply. Besides, it provides extra pin to drive external power devices (NMOS or NPN )
in case higher output current is needed. The output voltage is set with two external resistors. The 500KHz
high switching rate reduces the size of external components. Besides, the 14µA low quiescent current
together with high efficiency maintains long battery lifetime.
FEATURES
Low Quiescent (Switch-off) Supply Current: 14µA
Low Start-up Input Voltage: typical 0.8V
High Supply Capability: Deliver 3.3V 100mA with 1Alkaline Cell; 5V 300mA with 1 Li-Cell
Zero Shutdown Mode Supply Current
High efficiency: 90%
Fixed switching frequency: 500KHz
Options for internal or external power switches
Package type: SOT-26, SOT-89-5
APPLICATIONS
MP3, PDA, Electronic Dictionary, DSC, LCD, RF-Tag, Portable Devices, Wireless Devices, etc.
PIN ASSIGNMENT
1




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PS5005 Datasheet

Step-up DC/DC Converter

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PIN DESCRIPTION
ORDER INFORMATION
BLOCK DIAGRAM
PS5005
2


Part Number PS5005
Description Step-up DC/DC Converter
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