FAN5631
FAN5631 is Regulated Step-Down Charge Pump DC/DC Converter manufactured by Fairchild Semiconductor.
Features
- 90% Peak Efficiency
- Low EMI
- Low Ripple
- Selectable Output Voltage:1.2V/1.5V for FAN5631
- Efficiency Optimizer Feature for FAN5632
- Input Voltage Range: 2.2V to 5.5V
- Output Current: Up to 250m A
- ±5% Output Voltage Accuracy
- 30µA Operating Current
- ICC<1m A in Shutdown Mode
- 1.5MHz Operating Frequency
- Shutdown Isolates Output from Input
- Soft-Start Limits Inrush Current
- Short-Circuit and Over-Temperature Protection
- Minimum External ponent Count
- 10-Lead 3x3mm MLP Package
Applications
- Cell Phones
- Handheld puters
- Portable Electronic Equipment
- Core Supply to Next-Generation Processors
- Low-Voltage DC Bus
- Digital Cameras
- DSP Supplies
Description
The FAN5631/FAN5632 is an advanced, thirdgeneration switched capacitor step-down DC/DC converter utilizing Fairchild's proprietary Scalar Pump technology. This innovative architecture utilizes scalar switch re-configuration and fractional switching techniques to produce low output ripple, lower ESR spikes, and improve efficiency over a wide load range.
The FAN5631/FAN5632 produces a fixed regulated output voltage from an input voltage of 2.2V to 5V.
To maximize efficiency, the FAN5631/5632 achieves regulation by skipping pulses. Depending on load current, the size of the switches are scaled dynamically; consequently, current spikes and EMI are minimized. An internal soft-start circuitry prevents excessive current from the supply. The device is internally protected against short-circuit and over-temperature conditions.
The FAN5631 has a dual-output voltage feature
. When VSEL is high, VOUT is 1.5V; and when VSEL is low, VOUT is 1.2V.
The FAN5632 has an efficiency optimizer feature that, when enabled, changes the switch mode configuration from 2:1 to 1:1 at the lower threshold of VIN. The efficiency is maintained at its peak level over a wider range of input voltages. In addition, VOUT varies from 1.2V to 1.5V as a result of this efficiency optimization. If the efficiency optimizer is not...
