FAN2103_08

Manufacturer Part NumberFAN2103_08
Description
ManufacturerFAIRCHILD [Fairchild Semiconductor]
FAN2103_08 datasheet
 
1
Page 1
2
Page 2
3
Page 3
4
Page 4
5
Page 5
6
Page 6
7
Page 7
8
Page 8
9
Page 9
10
Page 10
11
12
13
14
Page 1/14

Download datasheet (965Kb)Embed
Next
FAN2103 — TinyBuck™
3A, 24V Input, Integrated Synchronous Buck Regulator
Features
3A Output Current
Over 95% Efficiency
Fully Synchronous Operation with Integrated
Schottky Diode on Low-side MOSFET Boosts
Efficiency
Programmable Frequency Operation (200KHz to
600KHz)
Power-good Signal
Accepts Ceramic Capacitors on Output
External Compensation for Flexible Design
Wide Input Range: 3V to 24V
Output Voltage Range: 0.8V to 90%V
Input Under-voltage Lockout
Programmable Over-current Limit
Under-voltage, Over-voltage, and
Thermal Protections
5x6mm, 25-pin, 3-pad MLP
Applications
Graphics Cards
Battery-powered Equipment
Set-top Boxes
Point-of-load Regulation
Servers
Ordering Information
Operating
Part Number
Temperature Range
FAN2103MPX
-10°C to 85°C
FAN2103EMPX
-40°C to 85°C
For Fairchild’s definition of “green” please visit: http://www.fairchildsemi.com/company/green/rohs_green.html.
© 2007 Fairchild Semiconductor Corporation
FAN2103 Rev. 1.0.5
Description
The FAN2103 TinyBuck™ is an easy-to-use, cost- and
space-efficient, 3A synchronous buck solution. It
enables designers to solve high current requirements in
a small area with minimal external components.
External
compensation,
frequency, and current limit features allow for design
optimization and flexibility.
The summing current mode modulator uses lossless
current sensing for current feedback and over-current,
and includes voltage feedforward.
Fairchild’s
advanced
combined with low R
thermally efficient MLP package provide the ability to
dissipate high power in a small package.
IN
Output
over-voltage,
shutdown protections plus power-good, help protect the
devices from damage during fault conditions.
Related Application Notes
AN-5067 – PCB Land Pattern Design and Surface
Mount Guidelines for MLP Packages
Package
25-Pin Molded Leadless Package
(MLP) 5x6mm
25-Pin Molded Leadless Package
(MLP) 5x6mm
May 2008
programmable
switching
BiCMOS
power
process,
internal MOSFETs and a
DS(ON)
under-voltage,
and
thermal
Packing
Eco Status
Method
Green
Tape and Reel
Green
Tape and Reel
www.fairchildsemi.com

FAN2103_08 Summary of contents

  • Page 1

    FAN2103 — TinyBuck™ 3A, 24V Input, Integrated Synchronous Buck Regulator Features 3A Output Current Over 95% Efficiency Fully Synchronous Operation with Integrated Schottky Diode on Low-side MOSFET Boosts Efficiency Programmable Frequency Operation (200KHz to 600KHz) Power-good Signal Accepts Ceramic Capacitors ...

  • Page 2

    Typical Application Diagram Block Diagram © 2007 Fairchild Semiconductor Corporation FAN2103 Rev. 1.0.5 Figure 1. Typical Application Figure 2. Block Diagram 2 www.fairchildsemi.com ...

  • Page 3

    Pin Configuration Figure 3. MLP 5x6mm Pin Configuration (Bottom View) Pin Definitions Pin Name Description P1, 6-12 SW Switching Node. P2, 2-5 VIN Power Input Voltage. Connect to the main input power source. P3, 21-23 PGND Power Ground. Power return ...

  • Page 4

    Absolute Maximum Ratings Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended. In addition, extended exposure ...

  • Page 5

    Electrical Specifications Recommended operating conditions are the result of using the circuit shown in Figure 1 unless otherwise noted. Parameter Power Supplies V Current CC V UVLO Threshold CC Oscillator Frequency (2) Minimum On-Time Ramp Amplitude, pk–pk (2) Minimum Off-Time ...

  • Page 6

    Electrical Specifications Recommended operating conditions are the result of using the circuit shown in Figure 1 unless otherwise noted. Parameter Control Functions EN Threshold, Rising EN Hysteresis EN Pull-up Resistance EN Discharge Current FB OK Drive Resistance PGOOD Threshold (Compared ...

  • Page 7

    Typical Characteristics 1.010 1.005 1.000 0.995 0.990 -50 0 Temperature ( Figure 4. Reference Voltage (V Normalized 1500 1200 900 600 300 Figure 6. Frequency vs. R 1.60 1.40 1.20 1.00 Q2 ~0.35 %/ ...

  • Page 8

    Application Circuit Typical Performance Characteristics Typical operating characteristics using the circuit shown in Figure 10. V Efficiency 100 0.00 0.50 1.00 1.50 Load Current (A) Figure 11. 1.8 V Efficiency Over ...

  • Page 9

    Typical Performance Characteristics Typical operating characteristics using the circuit shown in Figure 10. V Figure 15. SW and V OUT Figure 17. Transient Response, 1.5-3A Load (Circuit Values Changed) Figure 19. Start-up, 3A Load © 2007 Fairchild Semiconductor Corporation FAN2103 ...

  • Page 10

    Circuit Description Initialization Once V exceeds the UVLO threshold and HIGH, the IC checks for an open or shorted FB pin before releasing the internal soft-start ramp (SS open (as shown in Figure 1), ...

  • Page 11

    Calculating the Inductor Value Typically the inductor is set for a ripple current (ΔI 10% to 35% of the maximum DC load. Regulators requiring fast transient response use a value on the high side of this range, while regulators that ...

  • Page 12

    Under-Voltage Shutdown If FB remains below the under-voltage threshold for 16 consecutive clock cycles, the fault latch is set and the converter shuts down. This fault is prevented from setting the fault latch during soft-start. Over-Voltage Protection / Shutdown • ...

  • Page 13

    Physical Dimensions 2X TOP VIEW SIDE VIEW SEATING PLANE BOTTOM VIEW Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner without notice. Please note the revision and/or date on the drawing ...

  • Page 14

    Fairchild Semiconductor Corporation FAN2103 Rev. 1.0.5 14 www.fairchildsemi.com ...