FAN2108MPX Fairchild Semiconductor, FAN2108MPX Datasheet

FAN2108MPX
Manufacturer Part Number	FAN2108MPX
Description	IC REG SYNC BUCK 8A 3-24V 25-MLP
Manufacturer	Fairchild Semiconductor
Series	TinyBuck™
Type	Step-Down (Buck)
FAN2108MPX datasheet	1. FAN2108MPX.pdf (14 pages)

Specifications of FAN2108MPX
Internal Switch(s)	Yes	Synchronous Rectifier	Yes
Number Of Outputs	1	Voltage - Output	0.8 ~ 19 V
Current - Output	8A	Frequency - Switching	200kHz ~ 600kHz
Voltage - Input	3 ~ 24 V	Operating Temperature	-10°C ~ 85°C
Mounting Type	Surface Mount	Package / Case	25-MLP
Power - Output	2.8W	Output Voltage	3.2 V
Output Current	8 A	Input Voltage	5 V
Supply Current	8 mA	Switching Frequency	600 KHz
Mounting Style	SMD/SMT	Maximum Operating Temperature	+ 85 C
Minimum Operating Temperature	- 10 C	Lead Free Status / RoHS Status	Lead free / RoHS Compliant
Other names	FAN2108MPXTR

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FAN2108 — TinyBuck™

3-24V Input, 8A, High-Efficiency, Integrated Synchronous

Buck Regulator

Features

Wide Input Voltage Range: 3V-24V

Wide Output Voltage Range: 0.8V to 80% V

8A Output Current

Programmable Frequency Operation: 200KHz to

600KHz

Over 95% Peak Efficiency

Integrated Schottky Diode on Low-side MOSFET

Boosts Efficiency

Internal Bootstrap diode

Power-Good Signal

Pre-Bias Startup

Accepts Ceramic Capacitors on Output

External Compensation for Flexible Design

Input Under-Voltage Lockout

Programmable Current Limit

Under-Voltage, Over-Voltage, and Thermal

Shutdown Protections

Internal Soft-Start

5x6mm, 25-Pin, 3-Pad MLP Package

Applications

Servers

Point-of-Load Regulation

High-End Computing Systems

Graphics Cards

Battery-Powered Equipment

Set-Top Boxes

Ordering Information

Operating

Part Number

Temperature Range

FAN2108MPX

-10°C to 85°C

FAN2108EMPX

-40°C to 85°C

For Fairchild’s definition of Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html.

FAN2108 • Rev. 1.0.1

Description

The FAN2108 TinyBuck™ is a highly efficient, small

footprint, 8A, synchronous buck regulator.

The FAN2108 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.

External

compensation,

frequency, and current limit features allow design

optimization and flexibility.

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,

shutdown protections help protect the device from

damage during fault conditions. FAN2108 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

August 2009

programmable

switching

BiCMOS

power

process,

internal MOSFETs and a

DS(ON)

under-voltage,

and

thermal

Eco

Packing

Status

Method

Green

Tape and Reel

Green

Tape and Reel

www.fairchildsemi.com

Download datasheet (715Kb)

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FAN2108MPX Summary of contents
Page 1 ... Graphics Cards Battery-Powered Equipment Set-Top Boxes Ordering Information Operating Part Number Temperature Range FAN2108MPX -10°C to 85°C FAN2108EMPX -40°C to 85°C For Fairchild’s definition of Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html. © 2008 Fairchild Semiconductor Corporation FAN2108 • Rev. 1.0.1 Description The FAN2108 TinyBuck™ ... Page 2 ... Typical Application Block Diagram © 2008 Fairchild Semiconductor Corporation FAN2108 • Rev. 1.0.1 Figure 1. Typical Application Diagram Figure 2. Block Diagram 2 www.fairchildsemi.com ... Page 3 ... No Connect. This pin is not used. Ramp Amplitude. A resistor (R 25 RAMP and provides voltage feedforward functionality. © 2008 Fairchild Semiconductor Corporation FAN2108 • Rev. 1.0.1 ) from this pin to AGND can be used to program the current- ILIM ) from this pin to AGND sets the PWM switching ... Page 4 ... Typical thermal resistance when mounted on a four-layer, two-ounce PCB, as shown in Figure 24. Actual results are dependent on mounting method and surface related to the design. © 2008 Fairchild Semiconductor Corporation FAN2108 • Rev. 1.0.1 Conditions Conditions VCC to AGND VIN to PGND FAN2108MPX FAN2108EMPX Parameter P1 (Q2) P2 (Q1) P3 (1) (1) =25° ... Page 5 ... SW Shutdown: EN= Rising V CC Hysteresis R =50KΩ =24KΩ T 16V , 1. =30KΩ, IN OUT T R =200KΩ RAMP FAN2108MPX, 25°C FAN2108EMPX, 25°C ( =5V, V =2.2V CC COMP V =5V, V =1.2V CC COMP V =0.8V, 25° Open at 25°C (see Circuit ILIM Description) Internal IC Temperature Two Consecutive Clock Cycles ... Page 6 ... EN_HYS R EN Pull-Up Resistance Discharge Current Drive Resistance FB V PGOOD Threshold PG V PGOOD Output Low PG_L © 2008 Fairchild Semiconductor Corporation FAN2108 • Rev. 1.0.1 (Continued) Conditions Auto-Restart Mode FB < V REF FB > V REF I < 2mA OUT 6 Min. Typ. Max. Unit 1.35 2 ... Page 7 ... R Figure 6. Frequency vs. R 1.4 1.2 1 0.8 0.6 -50 0 Temperature (°C) Figure 8. R vs. Temperature, Normalized © 2008 Fairchild Semiconductor Corporation FAN2108 • Rev. 1.0.1 1.20 1.10 1.00 0.90 0.80 50 100 150 - 1.02 1.01 1.00 0.99 0.98 -50 80 100 120 140 (K Ω ... Page 8 ... Load Current (A) Figure 11. 1.8V Efficiency Over V OUT Efficiency@ Vin=12V, Vo=1. Load Current (A) Figure 13. 1.8V Efficiency Over Frequency OUT vs. Load © 2008 Fairchild Semiconductor Corporation FAN2108 • Rev. 1.0.1 Figure 10. Application Circuit: 1. 100 vs. Load Figure 12. 3.3V IN 0.8012 0.801 0.8008 0.8006 0.8004 ... Page 9 ... EN Figure 15. Startup, 3A Load V PGOOD EN Figure 17. Shutdown, 1A Load V OUT I OUT Figure 19. Transient Response, 2-8A Load © 2008 Fairchild Semiconductor Corporation FAN2108 • Rev. 1.0.1 (Continued) V OUT PGOOD Figure 16. Startup with 1V Pre-Bias on V OUT Figure 20. MOSFET Temperature – Still Air at Room 9 =12V, V =5V, unless otherwise specified. ... Page 10 ... KΩ and frequency ( KHz. T The regulator cannot start © 2008 Fairchild Semiconductor Corporation FAN2108 • Rev. 1.0.1 Soft-Start Once internal SS ramp has charged to 0.8V (T0.8), the output voltage is in regulation. Until SS ramp reaches 1.0V (T1.0), the fault latch is inhibited. To avoid skipping the soft-start cycle necessary to apply V Soft-start time is a function of oscillator frequency ... Page 11 ... Cycling restores operation after a CC normal soft-start cycle (refer to Auto-Restart section). © 2008 Fairchild Semiconductor Corporation FAN2108 • Rev. 1.0.1 The over-current protection fault latch is active during the soft-start cycle. Use a 1% resistor for ... Page 12 ... Figure 23. Enable Control with Latch Option © 2008 Fairchild Semiconductor Corporation FAN2108 • Rev. 1.0.1 Over-Temperature Protection (OTP) The chip incorporates an over-temperature protection circuit that sets the fault latch when a die temperature of about 150°C is reached. The IC restarts when the die temperature falls below 125° ... Page 13 ... 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 and contact a Fairchild Semiconductor representative to verify or obtain the most recent revision. Package specifications do not expand the terms of Fairchild’s worldwide terms and conditions, specifically the warranty therein, which covers Fairchild products. Always visit Fairchild Semiconductor’ ... Page 14 ... Fairchild Semiconductor Corporation FAN2108 • Rev. 1.0.1 14 www.fairchildsemi.com ...

FAN2108MPX Summary of contents

Page 1
... Graphics Cards Battery-Powered Equipment Set-Top Boxes Ordering Information Operating Part Number Temperature Range FAN2108MPX -10°C to 85°C FAN2108EMPX -40°C to 85°C For Fairchild’s definition of Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html. © 2008 Fairchild Semiconductor Corporation FAN2108 • Rev. 1.0.1 Description The FAN2108 TinyBuck™ ...
Page 2
... Typical Application Block Diagram © 2008 Fairchild Semiconductor Corporation FAN2108 • Rev. 1.0.1 Figure 1. Typical Application Diagram Figure 2. Block Diagram 2 www.fairchildsemi.com ...
Page 3
... No Connect. This pin is not used. Ramp Amplitude. A resistor (R 25 RAMP and provides voltage feedforward functionality. © 2008 Fairchild Semiconductor Corporation FAN2108 • Rev. 1.0.1 ) from this pin to AGND can be used to program the current- ILIM ) from this pin to AGND sets the PWM switching ...
Page 4
... Typical thermal resistance when mounted on a four-layer, two-ounce PCB, as shown in Figure 24. Actual results are dependent on mounting method and surface related to the design. © 2008 Fairchild Semiconductor Corporation FAN2108 • Rev. 1.0.1 Conditions Conditions VCC to AGND VIN to PGND FAN2108MPX FAN2108EMPX Parameter P1 (Q2) P2 (Q1) P3 (1) (1) =25° ...
Page 5
... SW Shutdown: EN= Rising V CC Hysteresis R =50KΩ =24KΩ T 16V , 1. =30KΩ, IN OUT T R =200KΩ RAMP FAN2108MPX, 25°C FAN2108EMPX, 25°C ( =5V, V =2.2V CC COMP V =5V, V =1.2V CC COMP V =0.8V, 25° Open at 25°C (see Circuit ILIM Description) Internal IC Temperature Two Consecutive Clock Cycles ...
Page 6
... EN_HYS R EN Pull-Up Resistance Discharge Current Drive Resistance FB V PGOOD Threshold PG V PGOOD Output Low PG_L © 2008 Fairchild Semiconductor Corporation FAN2108 • Rev. 1.0.1 (Continued) Conditions Auto-Restart Mode FB < V REF FB > V REF I < 2mA OUT 6 Min. Typ. Max. Unit 1.35 2 ...
Page 7
... R Figure 6. Frequency vs. R 1.4 1.2 1 0.8 0.6 -50 0 Temperature (°C) Figure 8. R vs. Temperature, Normalized © 2008 Fairchild Semiconductor Corporation FAN2108 • Rev. 1.0.1 1.20 1.10 1.00 0.90 0.80 50 100 150 - 1.02 1.01 1.00 0.99 0.98 -50 80 100 120 140 (K Ω ...
Page 8
... Load Current (A) Figure 11. 1.8V Efficiency Over V OUT Efficiency@ Vin=12V, Vo=1. Load Current (A) Figure 13. 1.8V Efficiency Over Frequency OUT vs. Load © 2008 Fairchild Semiconductor Corporation FAN2108 • Rev. 1.0.1 Figure 10. Application Circuit: 1. 100 vs. Load Figure 12. 3.3V IN 0.8012 0.801 0.8008 0.8006 0.8004 ...
Page 9
... EN Figure 15. Startup, 3A Load V PGOOD EN Figure 17. Shutdown, 1A Load V OUT I OUT Figure 19. Transient Response, 2-8A Load © 2008 Fairchild Semiconductor Corporation FAN2108 • Rev. 1.0.1 (Continued) V OUT PGOOD Figure 16. Startup with 1V Pre-Bias on V OUT Figure 20. MOSFET Temperature – Still Air at Room 9 =12V, V =5V, unless otherwise specified. ...
Page 10
... KΩ and frequency ( KHz. T The regulator cannot start © 2008 Fairchild Semiconductor Corporation FAN2108 • Rev. 1.0.1 Soft-Start Once internal SS ramp has charged to 0.8V (T0.8), the output voltage is in regulation. Until SS ramp reaches 1.0V (T1.0), the fault latch is inhibited. To avoid skipping the soft-start cycle necessary to apply V Soft-start time is a function of oscillator frequency ...
Page 11
... Cycling restores operation after a CC normal soft-start cycle (refer to Auto-Restart section). © 2008 Fairchild Semiconductor Corporation FAN2108 • Rev. 1.0.1 The over-current protection fault latch is active during the soft-start cycle. Use a 1% resistor for ...
Page 12
... Figure 23. Enable Control with Latch Option © 2008 Fairchild Semiconductor Corporation FAN2108 • Rev. 1.0.1 Over-Temperature Protection (OTP) The chip incorporates an over-temperature protection circuit that sets the fault latch when a die temperature of about 150°C is reached. The IC restarts when the die temperature falls below 125° ...
Page 13
... 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 and contact a Fairchild Semiconductor representative to verify or obtain the most recent revision. Package specifications do not expand the terms of Fairchild’s worldwide terms and conditions, specifically the warranty therein, which covers Fairchild products. Always visit Fairchild Semiconductor’ ...
Page 14
... Fairchild Semiconductor Corporation FAN2108 • Rev. 1.0.1 14 www.fairchildsemi.com ...

FAN2108MPX

FAN2108MPX

Specifications of FAN2108MPX

Related parts for FAN2108MPX

FAN2108MPX Summary of contents

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