Dual Channel 5V/800mA High Efficiency Step-Down DC/DC Converter - M3TEK
Description
M3TEK
IT77117
Dual Channel 5V/800mA High Efficiency Step-Down DC/DC Converter
Description
The IT77117DF 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.
The supply current during operation is 320µA only and will drop below 1µA after shutdown.
The IT77117DF 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.
Features
High Efficiency up to 95% 320µA Low Quiescent Current (Active Mode) 2.
5V to 6.
0V Input Voltage Range 800mA Output Current on Each Channel Fixed Frequency Operation Allowable 0.
6V Low Output Voltage Current Mode Operation Internal Soft-start Over-temperature Protection 0.
1µA Shutdown Current DFN 10L 3x3 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
Efficiency (% )
100 90 80 70 60 50
10
Figure 1.
Typical Application Circuit
Efficiency (% )
100 90 80 70 60 50
10
Rev.
0.
4.
2 www.
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Efficiency (Vin=5V)
Vout=3.
3V Vout=1.
2V
100
Output Current (mA)
Efficiency (Vin=3.
3V)
Vout=2.
5V Vout=1.
2V
100
Output Current (mA)
1000
1000
1
...
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