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PDF FAN2011I Data sheet ( Hoja de datos )

Número de pieza FAN2011I
Descripción 1.5A Low Voltage Current Mode Synchronous PWM Buck Regulator
Fabricantes Fairchild Semiconductor 
Logotipo Fairchild Semiconductor Logotipo



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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
www.fairchildsemi.com

1 page




FAN2011I pdf
Typical Performance Characteristics
TA = 25°C, CIN = 10µF, COUT = 40µF, L = 3.3µH, VIN = 5V, unless otherwise noted.
Output Voltage vs. Ambient Temperature
1.214
1.212
1.210
1.208
1.206
1.204
1.202
1.200
1.198
1.196
1.194
-40
Temp (C) vs Vout@ 0 mA
Temp (C) vs Vout@ 100mA
Temp (C) vs Vout@ 500 mA
Temp (C) vs Vout@ 1000 mA
Temp (C) vs Vout@ 1500 mA
-20 0 20 40 60 80
Ambient Temperature (°C)
100 120
Switching Frequency vs. Ambient Temperature
1260
1255
1250
1245
1240
1235
1230
0 20 40 60 80 100 120
Ambient Temperature (°C)
100
90
80
70
60
50
40
30
10
Efficiency vs. Load Current
VOUT = 3.3V
VOUT = 1.2V
VIN = 4.5V
VIN = 5V
VIN = 5.5V
100 1000
Load Current (mA)
10000
FAN2011/FAN2012 Rev. 1.0.2
5
www.fairchildsemi.com

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