FAN2001/FAN2002 1A High-Efficiency Step-Down DC-DC Converter

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FAN2001/FAN2002 1A High-Efficiency Step-Down DC-DC Converter

April 2005

FAN2001/FAN2002 1A High-Efficiency Step-Down DC-DC Converter
Features
96% Efficiency, Synchronous Operation Adjustable Output Voltage Options from 0.8V to VIN 2.5V to 5.5V Input Voltage Range Up to 1A Output Current Fixed Frequency 1.3MHz PWM Operation High Efficiency Power Save Mode 100% Duty Cycle Low Dropout Operation Soft Start Output Over-Voltage Protection Dynamic Output Voltage Positioning 25 A Quiescent Current Thermal Shutdown and Short Circuit Protection Pb-Free 3x3mm 6-Lead MLP Package

Description
Designed for use in battery-powered applications, the FAN2001/ FAN2002 is a high-efficiency, low-noise synchronous PWM current mode and Pulse Skip (Power Save) mode DC-DC converter. It can provide up to 1A of output current over a wide input range from 2.5V to 5.5V. The output voltage can be externally adjusted over a wide range of 0.8V to 5.5V by means of an external voltage divider. At moderate and light loads, pulse skipping modulation is used. Dynamic voltage positioning is applied, and the output voltage is shifted 0.8% above nominal value for increased headroom during load transients. At higher loads the system automatically switches over to current mode PWM control, operating at 1.3 MHz. A current mode control loop with fast transient response ensures excellent line and load regulation. To achieve high efficiency and ensure long battery life, the quiescent current is reduced to 25 A in Power Save mode, and the supply current drops below 1 A in shut-down mode. The FAN2001/FAN2002 is available in a 3x3m
m 6-lead MLP package.

Applications
Pocket PCs, PDAs Cell Phones Battery-Powered Portable Devices Digital Cameras Hard Disk Drives Set-Top-Boxes Point-of-Load Power Notebook Computers

Communications Equipment

Typical Application
VIN CIN 10 F EN
3

SW
1 2 6

3.3 H NC FB R2 10K R1 5K

VOUT 1.2V (1A) COUT 2 x 10 F
VOUT 1.2V (1A) 2 x 10 F R2 10K R1 5K L1 3.3 H

FB PGND SW

PGND

1 2 3

6

EN VIN PVIN 10 F

P1 (AGND)

5 4

P1 (AGND)

5 4

FAN2001

FAN2002

Figure 1. Typical Application

FAN2001/FAN2002 Rev. 1.0.2
2005 Fairchild Semiconductor Corporation

1

www.fairchildsemi.com

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