FAN2106_09

Manufacturer Part NumberFAN2106_09
Description3-24V Input, 6A, High-Efficiency, Integrated Synchronous Buck Regulator
ManufacturerFAIRCHILD [Fairchild Semiconductor]
FAN2106_09 datasheet
 


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FAN2106 — TinyBuck™
3-24V Input, 6A, High-Efficiency,
Integrated Synchronous Buck Regulator
Features
6A Output Current
Wide Input Range: 3V - 24V
Output Voltage Range: 0.8V to 80% V
Over 95% Peak Efficiency
1% Reference Accuracy Over Temperature
Programmable Frequency Operation: 200KHz to
600KHz
Fully Synchronous Operation with Integrated
Schottky Diode on Low-Side MOSFET Boosts
Efficiency
Internal Bootstrap Diode
Internal Soft-Start
Power-Good Signal
Starts on Pre-Biased Outputs
Accepts Ceramic Capacitors on Output
External Compensation for Flexible Design
Programmable Current Limit
Under-Voltage, Over-Voltage, and Thermal
Protections
5x6mm, 25-Pin, 3-Pad MLP Package
Applications
Servers & Telecom
Graphics Cards & Displays
Computing Systems
Point-of-Load Regulation
Set-Top Boxes & Game Consoles
Ordering Information
Operating
Part Number
Temperature Range
FAN2106MPX
-10°C to 85°C
FAN2106EMPX
-40°C to 85°C
For Fairchild’s definition of please visit: http://www.fairchildsemi.com/company/green/rohs_green.html.
© 2009 Fairchild Semiconductor Corporation
FAN2106 • Rev. 1.1.0
Description
The FAN2106 TinyBuck™ is a highly efficient, small-
footprint,
constant-frequency,
synchronous buck regulator.
IN
The FAN2106 contains both synchronous MOSFETs
and a controller/driver with optimized interconnects in
one package, which enables designers to solve high-
current requirements in a small area with minimal
external components. Integration helps to minimize
critical
inductances,
simpler and more efficient compared to discrete
solutions.
The
FAN2106
compensation, programmable switching frequency,
and current limit. These features allow design
flexibility and optimization. High-frequency operation
allows for all-ceramic solutions.
The summing current-mode modulator uses lossless
current sensing for current feedback and over-current
protection. Voltage feedforward helps operation over
a wide input voltage range.
Fairchild’s
advanced
combined with low-R
thermally efficient MLP package, provide the ability to
dissipate high power in a small package.
Output over-voltage, under-voltage, over-current, and
thermal shutdown protections help protect the device
from damage during fault conditions. FAN2106
prevents pre-biased output discharge during startup
in point-of-load applications.
Related Application Notes
AN-8022 — TinyCalc™ Calculator
Package
Molded Leadless Package (MLP) 5x6mm
Molded Leadless Package (MLP) 5x6mm
August 2009
6A,
integrated
making
component
layout
provides
for
external
loop
BiCMOS
power
process,
internal MOSFETs and a
DS(ON)
Eco
Packing Method
Status
Green
Tape and Reel
Green
Tape and Reel
www.fairchildsemi.com

FAN2106_09 Summary of contents

  • Page 1

    FAN2106 — TinyBuck™ 3-24V Input, 6A, High-Efficiency, Integrated Synchronous Buck Regulator Features 6A Output Current Wide Input Range 24V Output Voltage Range: 0.8V to 80% V Over 95% Peak Efficiency 1% Reference Accuracy Over Temperature Programmable Frequency Operation: ...

  • Page 2

    Typical Application Diagram Block Diagram © 2009 Fairchild Semiconductor Corporation FAN2106 • Rev. 1.1.0 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. Junction of high-side and low-side MOSFETs. P2, 2-5 VIN Power Input Voltage. Connect to the main input power source. ...

  • 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 Electrical specifications are the result of using the circuit shown in Figure 1 with V Parameter Power Supplies V Current CC V UVLO Threshold CC Oscillator Frequency (2) Minimum On-Time Ramp Amplitude, Peak-to-Peak (2) Minimum Off-Time Reference (3) ...

  • Page 6

    Electrical Specifications Electrical specifications are the result of using the circuit shown in Figure 1 with V Parameter Control Functions EN Threshold, Rising EN Hysteresis EN Pull-Up Resistance EN Discharge Current FB OK Drive Resistance PGOOD Threshold (Compared to V ...

  • 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 0.80 0.60 ...

  • Page 8

    Application Circuit Typical Performance Characteristics Typical operating characteristics using the circuit shown in Figure 10. V 100 12V Load (A) Figure 11. 1.8V Efficiency Over V OUT 100 ...

  • 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, 2-6A Load EN Figure 19. Startup, 3A Load © 2009 Fairchild Semiconductor Corporation FAN2106 • Rev. ...

  • Page 10

    Circuit Description PWM Generation Refer to Figure 2 for the PWM control mechanism. FAN2106 uses the summing-mode method of control to generate the PWM pulses. An amplified current-sense signal is summed with an internally generated ramp and the combined signal ...

  • Page 11

    MOSFET is fully enhanced. The fault latch is set immediately upon detection. The OV and high-side short fault protections are active all the time, including during soft-start. Over-Temperature Protection (OTP) The chip incorporates an over-temperature protection circuit that sets the ...

  • Page 12

    Δ = OUT I L • where f is the switching frequency. Setting the Ramp Resistor Value R resistor plays a critical role in the design by RAMP providing charging current to the ...

  • Page 13

    R also provides feedforward compensation for RAMP changes With a fixed R IN RAMP gain increases reduced; this could make it IN difficult to compensate the loop. For low-input-voltage- range designs (3V to 8V), ...

  • Page 14

    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 15

    Fairchild Semiconductor Corporation FAN2106 • Rev. 1.1.0 15 www.fairchildsemi.com ...