LM4510 Datasheet, PDF (1/18 Pages) National Semiconductor (TI) – Synchronous Step-Up DC/DC Converter with True Shutdown Isolation

October 2007
LM4510
Synchronous Step-Up DC/DC Converter with True
Shutdown Isolation
General Description
The LM4510 is a current mode step-up DC/DC converter with
a 1.2A internal NMOS switch designed to deliver up to 120
mA at 16V from a Li-Ion battery.
The device's synchronous switching operation (no external
Schottky diode) at heavy-load, and non-synchronous switch-
ing operation at light-load, maximizes power efficiency.
True shutdown function by synchronous FET and related cir-
cuitry ensures input and output isolation.
A programmable soft-start circuit allows the user to limit the
amount of inrush current during startup. The output voltage
can be adjusted by external resistors.
The LM4510 features advanced short-circuit protection to
maximize safety during output to ground short condition. Dur-
ing shutdown the feedback resistors and the load are discon-
nected from the input to prevent leakage current paths to
ground.
The LM4510 is available in a 10-pin thermally enhanced
Leadless Leadframe Package: LLP-10.
Features
■ ^{18V@80 mA from 3.2V input}
■ ^{5V@280 mA from 3.2V input}
■ ^{No external Schottky diode required}
■ ^{85% peak efficiency}
■ ^{Soft start}
■ ^{True shutdown isolation}
■ ^{Stable with small ceramic or tantalum output capacitors}
■ ^{Output short-circuit protection}
■ ^{Feedback fault protection}
■ ^{Input under-voltage lock out}
■ ^{Thermal shutdown}
■ ^{0.002 µA shutdown current}
■ ^{Wide input voltage range: 2.7V to 5.5V}
■ ^{1.0 MHz fixed frequency operation}
■ ^{Low-profile 10–pin LLP package (3mm x 3mm x 0.8mm)}
Applications
■ ^{Organic LED Panel Power Supply}
■ ^{Charging Holster}
■ ^{White LED Backlight}
■ ^{USB Power Supply}
■ ^{Class D Audio Amplifier}
■ ^{Camera Flash LED Driver}
Typical Application Circuit
FIGURE 1. Typical Application Circuit
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