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General Description
The FAN5602 is a universal switched capacitor DC/DC converter capable of
step-up or step-down operation. Due to its unique adaptive fractional switching
topology, the device achieves high efficiency over a wider input/ output voltage
range than any of its predecessors. The FAN5602 utilizes resistance-modulated
loop control, which produces lower switching noise than other topologies.
Depending upon actual load conditions, the device automatically switches between
constant-frequency and pulse-skipping modes of operation to extend battery life.
The FAN5602 produces a fixed regulated output within the range of 2.7V to 5.5V
from any type of voltage source. High efficiency is achieved under various
input/output voltage conditions because an internal logic circuit automatically
reconfigures the system to the best possible topology. Only two 1µF bucket
capacitors and one 10µF output capacitor are needed. During power on, soft-start
circuitry prevents excessive current drawn from the supply. The device is
protected against short-circuit and over-temperature conditions. The FAN5602 is
available with 3.3V, 4.5V, and 5.0V output voltage. Any other output voltage
option within the 1.5V to 5V range is available upon request. The FAN5602 is
available in 8-lead MSOP and 3x3mm 8-lead MLP packages.
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Features
- Low-Noise, Constant-Frequency Operation at Heavy Load
- High-Efficiency, Pulse-Skip (PFM) Operation at Light Load
- Switch Configurations (1:3, 1:2, 2:3, 1:1, 3:2, 2:1, 3:1)
- 92% Peak Efficiency
- Input Voltage Range: 2.7V to 5.5V
- Output Current: 3.3V, 200mA at VIN = 3.6V
- ±3% Output Voltage Accuracy
- ICC < 1µA in Shutdown Mode
- 1MHz Operating Frequency
- Shutdown Isolates Output from Input
- Soft-Start Limits Inrush Current at Start-up
- Short-Circuit and Over-Temperature Protection
- Minimum External Component Count
- No Inductors
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Applications
- Cell Phones
- Handheld Computers
- Portable RF Communication Equipment
- Core Supply to Low-Power Processors
- Low-Voltage DC Bus
- DSP Supplies
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