FAN2012

FAN2011/FAN2012 1.5A Low Voltage Current Mode Synchronous PWM Buck Regulator

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FAN2011/FAN2012 1.5A Low Voltage Current Mode Synchronous PWM Buck Regulator

April 2006

FAN2011/FAN2012 1.5A Low Voltage Current Mode Synchronous PWM Buck Regulator
Features
95% Efficiency, Synchronous Operation Adjustable Output Voltage from 0.8V to VIN 4.5V to 5.5V Input Voltage Range Up to 1.5A Output Current Fixed Frequency 1.3 MHz PWM Operation 100% Duty Cycle Low Dropout Operation (LDO) Soft Start Excellent Load Transient Response 3x3mm 6-lead MLP Package

Description
The FAN2011/FAN2012 is a high-efficiency, low-noise synchronous Pulse Width Modulated (PWM) current mode DC-DC converter, designed for low voltage applications. It provides up to 1.5A continuous load current from the 4.5V to 5.5V input. The output voltage is adjustable over a wide range of 0.8V to VIN by means of an external voltage divider. The FAN2011 is always on, while the FAN2012 has an "Enable Input," and the device can be put in the shutdown mode, in which the ground current falls below 1 A. A current mode control loop with a fast transient response ensures excellent line and load regulation. The fixed 1.3MHz switching frequency enables the user to choose a small, inexpensive external inductor and capacitor. Filtering is also easily accomplished with very small components. Protection features include input under-voltage lockout, short circuit protection and thermal shutdown. Soft-start limits in-rush current during start-up conditions. The device is available in a 3x3mm 6-lead MLP package, making it p
ossible to build a 1.5A complete DC-DC converter in a tiny space on the PCB.

Applications
Hard Disk Drive Set Top Box Point of Load Power Notebook Computers Communications Equipment

Ordering Information
Product Number
FAN2011 FAN2012 FAN2011I FAN2012I

Output Voltage
Adjustable Adjustable Adjustable Adjustable

Package Type
3x3mm 6-Lead MLP 3x3mm 6-Lead MLP 3x3mm 6-Lead MLP 3x3mm 6-Lead MLP

Ambient Operating Temperature
0 C to 85 C 0 C to 85 C -40 C to 85 C -40 C to 85 C

Order Code
FAN2011MPX FAN2012MPX FAN2011EMPX FAN2012EMPX

FAN2011/FAN2012 Rev. 1.0.4
2006 Fairchild Semiconductor Corporation

www.fairchildsemi.com