IC REG SYNC BUCK 3-24V 8A 25MLP

FAN2108EMPX

Manufacturer Part NumberFAN2108EMPX
DescriptionIC REG SYNC BUCK 3-24V 8A 25MLP
ManufacturerFairchild Semiconductor
SeriesTinyBuck™
TypeStep-Down (Buck)
FAN2108EMPX datasheet
 


Specifications of FAN2108EMPX

Internal Switch(s)YesSynchronous RectifierYes
Number Of Outputs1Voltage - Output0.8 ~ 19 V
Current - Output8AFrequency - Switching200kHz ~ 600kHz
Voltage - Input3 ~ 24 VOperating Temperature-40°C ~ 85°C
Mounting TypeSurface MountPackage / Case25-MLP
Power - Output2.8WMounting StyleSMD/SMT
Efficiency95 %Input / Supply Voltage (max)24 V
Input / Supply Voltage (min)3 VMaximum Operating Temperature+ 85 C
Minimum Operating Temperature- 40 COperating Temperature Range- 40 C to + 85 C
Output Current8 AOutput Power2.8 W
Output Voltage3.2 VSupply Current8 mA
Switching Frequency600 KHzLead Free Status / RoHS StatusLead free / RoHS Compliant
Other namesFAN2108EMPXTR  
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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.
© 2008 Fairchild Semiconductor Corporation
FAN2108 • Rev. 1.0.1
Description
The FAN2108 TinyBuck™ is a highly efficient, small
footprint, 8A, synchronous buck regulator.
IN
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
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

FAN2108EMPX Summary of contents

  • Page 1

    ... 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™ highly efficient, small footprint, 8A, synchronous buck regulator ...

  • 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° Min ...

  • 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 ...