5V/800mA High Efficiency Step-Down DC/DC Converter - M3TEK
Description
M3TEK
IT77103
5V/800mA High Efficiency Step-Down DC/DC Converter
Description
The IT77103 is a high efficiency step-down DC/DC converter using a constant frequency, current mode architecture.
The device integrates a main switch and a synchronous rectifier for high efficiency without an external schottky diode.
Supply current during operation is only 160µA and drops to < 1µA after shutdown.
The IT77103 can supply 800mA of load current from 2.
5V to 6.
0V input voltage.
The output voltage can be regulated as low as 0.
6V.
The switching frequency is internally set at 1.
2MHz, allowing the use of small surface mount inductors and capacitor.
The IT77103 is available in a low profile TSOT23_5L/ SOT23_5L package
Features
High Efficiency up to 95% 160µA Low Quiescent Current (Active Mode) 2.
5V to 6.
0V Input Voltage Range 800mA Output Current Fixed Frequency Operation Allowable 0.
6V Low Output Voltage Current Mode Operation Internal Soft-start Over-temperature Protection 0.
1µA Shutdown Current TSOT23_5L/ SOT23_5L Small Package RoHS Compliant (100% Green Available)
Applications
Cellular Telephone PDA and Smart Phone MP3 Player Microprocessor and DSP Core Supply Wireless and DSL Card Digital Still Camera Slim-Type DVD Portable Device
Typical Applications
Figure 1.
Typical Application Circuit
Efficiency (% )
Efficiency (Vin=5V)
100 90 80 70 60 50
10
Vout=3.
3V
Vout=1.
2V
100
Output Current (mA)
1000
Rev.
0.
3.
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