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FAN2011I Schematic ( PDF Datasheet ) - Fairchild Semiconductor

Teilenummer FAN2011I
Beschreibung 1.5A Low Voltage Current Mode Synchronous PWM Buck Regulator
Hersteller Fairchild Semiconductor
Logo Fairchild Semiconductor Logo 




Gesamt 10 Seiten
FAN2011I Datasheet, Funktion
November 2004
FAN2011/FAN2012
1.5A Low Voltage Current Mode Synchronous PWM Buck
Regulator
Features
I 95% Efficiency, Synchronous Operation
I Adjustable Output Voltage from 0.8V to VIN
I 4.5V to 5.5V Input Voltage Range
I Up to 1.5A Output Current
I Fixed Frequency 1.3 MHz PWM Operation
I 100% Duty Cycle Low Dropout Operation
I Soft Start
I Excellent Load Transient Response
I 3x3mm 6-lead MLP Package
Applications
I Hard Disk Drive
I Set Top Box
I Point of Load Power
I Notebook Computers
I Communications Equipment
Description
The FAN2011/FAN2012 is a high-efficiency, low-noise synchro-
nous PWM current mode DC-DC converter, designed for low
voltage applications. It provides up to 1.5A continuous load cur-
rent from the 4.5V to 5.5V input. The output voltage is adjust-
able 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 1µA.
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, inex-
pensive 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, mak-
ing it possible to build a 1.5A complete DC/DC converter in a
tiny space on the PCB.
Typical Application
R1
VOUT
FB 1
10K
R2 PGND
2
L1 SW
3
3.3µH
4 x 10µF
P1
(AGND)
6 NC
5 VIN
4 PVIN
+5V
10µF
R1
VOUT
FB 1
10K
R2 PGND
2
L1 SW
3
3.3µH
4 x 10µF
P1
(AGND)
EN
6
5 VIN
4 PVIN
+5V
10µF
FAN2011
Figure 1. Typical Application
FAN2012
FAN2011/FAN2012 Rev. 1.0.2
1
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FAN2011I Datasheet, Funktion
Typical Performance Characteristics (Continued)
TA = 25°C, CIN = 10µF, COUT = 40µF, L = 3.3µH, VIN = 5V, unless otherwise noted.
Start-up Response
Start-up Response
Input
Voltage
(5V/div)
Input
Voltage
(5V/div)
SW Node
Voltage
(5V/div)
SW Node
Voltage
(5V/div)
Inductor
Current
(200mA/div)
Output
Voltage
(500mV/div)
VOUT = 1.2V
IOUT = 100mA
Time (50µs/div)
Inductor
Current
(200mA/div)
Output
Voltage
(1V/div)
VOUT = 3.3V
IOUT = 100mA
Time (100µs/div)
Input
Voltage
(5V/div)
SW Node
Voltage
(5V/div)
Inductor
Current
(500mA/div)
Output
Voltage
(500mV/div)
Load
Current
100mA
SW Node
Voltage
(5V/div)
Output
Voltage
(20mV/div)
Inductor
Current
(200mA/div)
Start-up Response
Input
Voltage
(5V/div)
SW Node
Voltage
(5V/div)
Inductor
Current
(500mA/div)
IVOOUUTT==115.020VmA
Output
Voltage
(1V/div)
Time (100µs/div)
Transient Response
700mA
VOUT = 1.2V
Time (5µs/div)
Load
Current
700mA
SW Node
Voltage
(5V/div)
Output
Voltage
(20mV/div)
Inductor
Current
(200mA/div)
Start-up Response
VOUT = 3.3V
IOUT = 1500mA
Time (100µs/div)
Transient Response
100mA
VOUT = 1.2V
Time (5µs/div)
FAN2011/FAN2012 Rev. 1.0.2
6
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