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PWM Step-down DC-DC Controller IC
Product Profile
    Application Note
General Description:
The CN5208 is a switch-mode PWM step-down DC-DC controller using few external components.
It achieves 5A continuous output current over a wide input supply range with excellent load and line regulation. The output voltage is internally set at 5V.
The high switching frequency of 550KHz allows tiny external components to be usable. The CN5208 is designed to be stable with ceramic output capacitor. Pulse skipping mode is adopted under light load for high efficiency. Furthermore, the low operating current and low dropout operation make the CN5208 is suitable for battery powered systems.
Fault protection includes cycle-by-cycle current limit, short output protection and output overvoltage protection. In shutdown mode, the CN5208 draws only 7.5μA(VCC=15V) of supply current. On-chip soft-start minimizes the inrush supply current and the output overshoot at initial startup.
The CN5208 is available in a space-saving 8-pin SOP package.
Set-Top Box, Modems Pre-regulator
Distributed Power Systems Battery Chargers
Wide Input Voltage: 4.8V to 32V
Operating with an External P-Channel MOSFET
Output Current Up to 5A
Fixed Switching Frequency: 550KHz
Fixed Output Voltage with 1% Accuracy
Efficiency up to 95%
Low Drop-Out Mode
On-Chip Power-On Delay to Debounce Input Supply
Cycle-by-Cycle Current Limit
Overvoltage protection
Frequency Foldback for Output Short Circuit Protection
Built-in Soft Start
High Efficiency at Light Load with Pulse Skipping Mode
Shutdown Curent: 7.5uA typical at 15V
Operating Ambient Temperature:-40℃ to +85℃
Available in 8-Pin SOP Package
Pb-free, Rohs-Compliant, Halogen Free
Applications Note:
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