FAN2012 Fairchild Semiconductor, FAN2012 Datasheet

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FAN2012

Manufacturer Part Number
FAN2012
Description
1.5A Low Voltage Current Mode Synchronous PWM Buck Regulator
Manufacturer
Fairchild Semiconductor
Datasheet

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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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FAN2012 Summary of contents

Page 1

... The output voltage is adjust- able over a wide range of 0. 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 fi ...

Page 2

... 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. Pin Name P1 AGND Analog Ground. P1 must be soldered to the PCB ground Feedback Input. Adjustable voltage option, connect this pin to the resistor divider. ...

Page 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. FAN2011/FAN2012 Rev. 1.0.2 (Note1) Parameter ), 3mmx3mm 6-lead MLP (Note 2) JC FAN2011 and FAN2012 FAN2011I and FAN2012I θ strong function of PCB material, board thickness, thickness and , JA 3 Min Max -0 ...

Page 4

... Output Voltage During Load Transition (Note 5) Output Voltage During Load Transition (Note 5) Reverse Leakage Current Into Pin SW Reference Voltage, V REF Output Voltage Accuracy Additional Electrical Characteristics for FAN2012 T = 0°C to +85° 4.5 to 5.5V. Typical values are Parameter Shutdown Mode Supply Current ...

Page 5

... 5. 100 Load Current (mA) FAN2011/FAN2012 Rev. 1.0.2 = 40µ 3.3µ 5V, unless otherwise noted. IN Switching Frequency vs. Ambient Temperature 1260 Temp (∞ Vout Temp (∞ Vout@ 100mA 1255 Temp (∞ Vout@ 500 mA Temp (∞ Vout@ 1000 mA Temp (∞ ...

Page 6

... Time (100µs/div) Transient Response Load 100mA Current SW Node Voltage (5V/div) Output Voltage (20mV/div) Inductor Current (200mA/div) Time (5µs/div) FAN2011/FAN2012 Rev. 1.0.2 (Continued) = 40µ 3.3µ 5V, unless otherwise noted. IN Input Voltage (5V/div) SW Node Voltage (5V/div) Inductor Current (200mA/div) Output ...

Page 7

... P-channel switch ON resistance DS_ON I = Output current LOAD R = Inductor DC resistance L UVLO and Soft Start The reference and the circuit remain reset until the V its UVLO threshold. FAN2011/FAN2012 Rev. 1.0.2 EN UNDER VOLTAGE LOCKOUT LOGIC COMP CONTROL OVER VOLTAGE COMP OSC REF FB Figure 4. Block Diagram The FAN2011 has an internal soft-start circuit that limits the in- rush current during start-up ...

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 inductor should be rated higher than the maximum ...

Page 9

... Ordering Information Product Number Output Voltage FAN2011 Adjustable FAN2012 Adjustable FAN2011I 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° ...

Page 10

... PRODUCT STATUS DEFINITIONS Definition of Terms Datasheet Identification Advance Information Preliminary No Identification Needed Obsolete FAN2011/FAN2012 Rev. 1.0.2 Power247™ ISOPLANAR™ PowerEdge™ LittleFET™ PowerSaver™ MICROCOUPLER™ MicroFET™ PowerTrench QFET MicroPak™ ...

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