FAN5601 Datasheet, PDF (1/14 Pages) Fairchild Semiconductor – Regulated Step-Down Charge Pump DC/DC Converter

www.fairchildsemi.com
FAN5601
Regulated Step-Down Charge Pump DC/DC Converter
Features
• > 85% Peak Efficiency
• Low EMI
• Low Ripple
• Output Voltage 1.3V/1.8V
• Input Voltage Range: 2.2V to 5.5V
• Output Current: Up to 250mA
• ±2.5% Output Voltage Accuracy
• 30µA Operating Current
• I_CC < 1µA in Shutdown Mode
• 2MHz Operating Frequency
• Shutdown Isolates Output from Input
• Soft-Start Limits Inrush Current
• Short Circuit and Over Temperature Protection
• Minimum External Component Count
• 6-Lead 3x3mm MLP Package
Applications
• Cell Phones
• Handheld Computers
• Portable Electronic Equipment
• Core Supply to Next Generation Processors
• Low Voltage DC Bus
• Digital Cameras
• DSP Supplies
Description
The FAN5601 is an advanced third generation switched
capacitor step down DC/DC converter utilizing Fairchild’s
proprietary ScalarPump™ technology. This innovative archi-
tecture utilizes scalar switch re-configuration and fractional
switching techniques to produce low output ripple, low ESR
spikes and improve efficiency over a wide load range.
The FAN5601 produces a fixed regulated output from 2.2V
to 5V input voltage. Customized output voltages are avail-
able in 100mV increments from 1V to 1.8V. Contact market-
ing for customized outputs.
In order to maximize efficiency, the FAN5601 achieves
regulation by skipping pulses. Depending upon load current,
the size of the switches is scaled dynamically, consequently,
current spikes and EMI are minimized. An internal soft start
circuitry prevents excessive current drawn from the supply.
The device is internally protected against short circuit and
over temperature conditions.
The FAN5601 is available in 6-lead 3x3mm MLP.
ScalarPump^™ is a registered trademark of Fairchild Semiconductor Corporation.
Typical Application
C_B = 1µF
INPUT 2.2V to 5.5V
C_IN = 10µF
C+
V_IN
C- _{OUTPUT 1.0V t o 1.8V}
V_OUT
ENABLE GND
C_OUT = 10µF
REV. 1.0.4 4/4/05