FAN2108MPX Fairchild Semiconductor, FAN2108MPX Datasheet
FAN2108MPX
Specifications of FAN2108MPX
Related parts for FAN2108MPX
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 ...