FAN2011IMPX Fairchild Semiconductor, FAN2011IMPX Datasheet

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FAN2011IMPX

Manufacturer Part Number
FAN2011IMPX
Description
1.5A Low Voltage Current Mode Synchronous PWM Buck Regulator
Manufacturer
Fairchild Semiconductor
Datasheet
1.FAN2011IMPX.pdf (10 pages)
FAN2011/FAN2012 Rev. 1.0.2
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 V
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
Typical Application
V
OUT
R1
4 x 10µF
R2
10KΩ
L1
3.3µH
PGND
SW
FB
1
2
3
FAN2011
(AGND)
P1
6
5
4
IN
NC
V
PV
Figure 1. Typical Application
IN
IN
+5V
10µF
1
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 V
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.
V
OUT
R1
4 x 10µF
R2
10KΩ
L1
3.3µH
PGND
SW
FB
1
2
3
FAN2012
(AGND)
IN
P1
by means of an external
6
5
4
November 2004
EN
V
PV
www.fairchildsemi.com
IN
IN
+5V
10µF

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FAN2011IMPX Summary of contents

Page 1

FAN2011/FAN2012 1.5A Low Voltage Current Mode Synchronous PWM Buck Regulator Features I 95% Efficiency, Synchronous Operation I Adjustable Output Voltage from 0. 4.5V to 5.5V Input Voltage Range 1.5A Output Current I Fixed Frequency ...

Page 2

Pin Assignment FB PGND SW 3x3mm 6-Lead MLP Pin Description FAN2011 (3x3mm 6-Lead MLP) Pin No. Pin Name P1 AGND Analog Ground. P1 must be soldered to the PCB ground Feedback Input. Adjustable voltage option, connect this pin ...

Page 3

Absolute Maximum Ratings and any other pin IN Thermal Resistance-Junction to Tab ( θ Lead Soldering Temperature (10 seconds) Storage Temperature Junction Temperature Electrostatic Discharge (ESD) Protection Level (Note 3) Recommended Operating Conditions Parameter Supply Voltage Range ...

Page 4

Electrical Characteristics V = 4.5V to 5.5V 1.2V OUT +85°C, unless otherwise noted. Typical values are at T Parameter Input Voltage Quiescent Current UVLO Threshold PMOS On Resistance NMOS On Resistance P-channel Current Limit Over-Temperature Protection ...

Page 5

Typical Performance Characteristics T = 25° 10µ OUT 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 - Ambient Temperature (°C) Efficiency vs. Load ...

Page 6

Typical Performance Characteristics T = 25° 10µ OUT Start-up Response Input Voltage (5V/div) SW Node Voltage (5V/div) Inductor Current (200mA/div) Output Voltage (500mV/div) Time (50µs/div) Start-up Response Input Voltage (5V/div) SW Node Voltage (5V/div) Inductor ...

Page 7

Block Diagram DIGITAL SOFT START FB ERROR AMP 0.8V GND IS SLOPE COMPENSATION Detailed Operation Description The FAN2011 is a step-down pulse width modulated (PWM) current mode converter with a typical switching frequency of 1.3 MHz. At the beginning of ...

Page 8

Inductor Selection The inductor parameters directly related to device performances are saturation current and dc resistance. The FAN2011/ FAN2012 operates with a typical inductor value of 3.3µH. The lower the dc resistance, the higher the efficiency. For saturation current, the ...

Page 9

... Adjustable FAN2012I Adjustable FAN2011/FAN2012 Rev. 1.0.2 Ambient Operating Package Type Temperature 3x3mm 6-Lead MLP 0°C to 85°C 3x3mm 6-Lead MLP 0°C to 85°C 3x3mm 6-Lead MLP -40°C to 85°C 3x3mm 6-Lead MLP -40°C to 85°C 9 Order Code FAN2011MPX FAN2012MPX FAN2011IMPX FAN2012IMPX www.fairchildsemi.com ...

Page 10

... TRADEMARKS The following are registered and unregistered trademarks Fairchild Semiconductor owns or is authorized to use and is not intended exhaustive list of all such trademarks.  ACEx™ FAST ActiveArray™ FASTr™ Bottomless™ FPS™ CoolFET™ FRFET™ CROSSVOLT™ ...

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