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Fairchild Semiconductor Electronic Components Datasheet

FAN2011 Datasheet

1.5A Low Voltage Current Mode Synchronous PWM Buck Regulator

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FAN2011 pdf
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


Fairchild Semiconductor Electronic Components Datasheet

FAN2011 Datasheet

1.5A Low Voltage Current Mode Synchronous PWM Buck Regulator

No Preview Available !

FAN2011 pdf
Pin Assignment
Top View
FB 1
PGND 2
SW 3
P1
(AGND)
6 NC
5 VIN
FB 1
PGND 2
4 PVIN
SW 3
6 EN
P1
(AGND)
5
VIN
4 PVIN
FAN2011
3x3mm 6-Lead MLP
FAN2012
3x3mm 6-Lead MLP
Figure 2. Pin Assignment
Pin Description
FAN2011 (3x3mm 6-Lead MLP)
Pin No.
P1
1
2
3
4
5
6
Pin Name
Pin Description
AGND
Analog Ground. P1 must be soldered to the PCB ground.
FB Feedback Input. Adjustable voltage option, connect this pin to the resistor divider.
PGND
Power Ground. This pin is connected to the internal MOSFET switches. This pin must be exter-
nally connected to AGND.
SW Switching Node. This pin is connected to the internal MOSFET switches.
PVIN
VIN
NC
Supply Voltage Input. This pin is connected to the internal MOSFET switches.
Supply Voltage Input.
Not Connected. This pin is not internally connected.
FAN2012(3x3mm 6-Lead MLP)
Pin No.
P1
1
2
3
4
5
6
Pin Name
Pin Description
AGND
Analog Ground. P1 must be soldered to the PCB ground.
FB Feedback Input. Adjustable voltage option, connect this pin to the resistor divider.
PGND
Power Ground. This pin is connected to the internal MOSFET switches. This pin must be exter-
nally connected to AGND.
SW Switching Node. This pin is connected to the internal MOSFET switches.
PVIN
VIN
EN
Supply Voltage Input. This pin is connected to the internal MOSFET switches.
Supply Voltage Input.
Enable Input. Logic high enables the chip and logic low disables the chip, reducing the supply
current to less than 1µA. Do not oat this pin.
FAN2011/FAN2012 Rev. 1.0.2
2
www.fairchildsemi.com


Part Number FAN2011
Description 1.5A Low Voltage Current Mode Synchronous PWM Buck Regulator
Maker Fairchild Semiconductor
Total Page 10 Pages
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FAN2011 pdf
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