FAN2002 Fairchild Semiconductor, FAN2002 Datasheet

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FAN2002

Manufacturer Part Number
FAN2002
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
Manufacturer
Fairchild Semiconductor
Datasheet

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©2005 Fairchild Semiconductor Corporation
FAN2001/FAN2002 Rev. 1.0.2
FAN2001/FAN2002
1A High-Efficiency Step-Down DC-DC Converter
Features
■ 96% Efficiency, Synchronous Operation
■ Adjustable Output Voltage Options from 0.8V to V
■ 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 µ A Quiescent Current
■ Thermal Shutdown and Short Circuit Protection
■ Pb-Free 3x3mm 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
10µF
C
IN
PGND
V
EN
IN
1
2
3
FAN2001
(AGND)
P1
6
5
4
SW
NC
FB
3.3µH
R2
R1
10KΩ
5KΩ
Figure 1. Typical Application
IN
C
2 x 10µF
OUT
1.2V (1A)
V
OUT
1
1.2V (1A)
Description
Designed for use in battery-powered applications, the FAN2001/
FAN2002 is a high-efficiency, low-noise synchronous PWM cur-
rent mode and Pulse Skip (Power Save) mode DC-DC con-
verter. 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 dur-
ing 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 effi-
ciency and ensure long battery life, the quiescent current is
reduced to 25µA in Power Save mode, and the supply current
drops below 1µA in shut-down mode. The FAN2001/FAN2002 is
available in a 3x3mm 6-lead MLP package.
V
OUT
R1
5K
2 x 10µF
R2
10K
3.3µH
L1
PGND
SW
FB
1
2
3
FAN2002
(AGND)
P1
6
5
4
www.fairchildsemi.com
EN
V
PV
IN
IN
April 2005
10µF

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FAN2002 Summary of contents

Page 1

... To achieve high effi- ciency and ensure long battery life, the quiescent current is reduced to 25µA in Power Save mode, and the supply current drops below 1µA in shut-down mode. The FAN2001/FAN2002 is available in a 3x3mm 6-lead MLP package. V OUT 1 ...

Page 2

... Pin Assignment PGND Pin Description FAN2001 (3x3mm 6-Lead MLP) Pin No. Pin Name P1 AGND PGND FAN2002 (3x3mm 6-Lead MLP) Pin No. Pin Name P1 AGND PGND FAN2001/FAN2002 Rev. 1.0.2 Top View ...

Page 3

... Junction to ambient thermal resistance, θ via used, diameter of via used, available copper surface, and attached heat sink characteristics. 3. Using Mil Std. 883E, method 3015.7(Human Body Model) and EIA/JESD22C101-A (Charge Device Model). 4. Refer to the applications section for further details. FAN2001/FAN2002 Rev. 1.0.2 (Note1) Parameter , ...

Page 4

... Over-Temperature Protection PWM Mode Only Start-Up Time Notes: 5. Refer to the application section for further details. 6. For output voltages ≤ 1. µ F output capacitor value is required to achieve a maximum output accuracy of 3% while operating in power save mode (PFM mode). FAN2001/FAN2002 Rev. 1.0.2 = 350mA, V =1.2V OUT OUT = 25°C. ...

Page 5

... 0 Load Current (mA) Quiescent Current vs. Input Voltage OUT 10KΩ 2.5 3.0 3.5 4.0 Input Voltage (V) FAN2001/FAN2002 Rev. 1.0.2 = 10KΩ, unless otherwise noted. 2 100 3. 1.2V OUT 100 1000 0.1 1.214 1.212 1.210 1 ...

Page 6

... L = 3.3µ OUT PWM Mode Time (1µs/div) Load Transient Response 100mA V = 1.2V OUT Time (10µs/div) Start-Up Response Time (100µs/div) FAN2001/FAN2002 Rev. 1.0.2 (Contd.) = 10KΩ, unless otherwise noted. 2 600mA V = 1.2V OUT I = 10mA OUT 6 Power Save Mode Time (5µs/div) ...

Page 7

... N-channel rectifier switch. The device stays in sleep mode until the output voltage falls below the low threshold. The FAN2001/FAN2002 enters the PWM mode as soon as the out- put voltage can no longer be regulated in PFM with constant peak current. ...

Page 8

... The inductor parameters directly related to the device’s perfor- mances are saturation current and dc resistance. The FAN2001/ FAN2002 operates with a typical inductor value of 3.3µH. The lower the dc resistance, the higher the efficiency. For saturation current, the inductor should be rated higher than the maximum load current plus half of the inductor ripple current ...

Page 9

... Figure 6. Recommended PCB Layout (FAN2002) FAN2001/FAN2002 Rev. 1.0.2 Therefore, use wide traces for high current paths and place the input capacitor, the inductor, and the output capacitor as close as possible to the integrated circuit terminals. In order to mini- mize voltage stress to the device resulting from ever present switching spikes, use an input bypass capacitor with low ESR ...

Page 10

... Mechanical Dimensions 3x3mm 6-Lead MLP Ordering Information Product Number FAN2001 FAN2002 FAN2001/FAN2002 Rev. 1.0.2 Output Voltage Package Type Adjustable 3x3mm 6-Lead MLP Adjustable 3x3mm 6-Lead MLP 10 Order Code FAN2001MPX FAN2002MPX www.fairchildsemi.com ...

Page 11

... PRODUCT STATUS DEFINITIONS Definition of Terms Datasheet Identification Advance Information Preliminary No Identification Needed Obsolete FAN2001/FAN2002 Rev. 1.0.2 IntelliMAX™ POP™ Power247™ ISOPLANAR™ PowerEdge™ LittleFET™ MICROCOUPLER™ PowerSaver™ PowerTrench MicroFET™ ...

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