FAN2110 Fairchild Semiconductor, FAN2110 Datasheet
FAN2110
Related parts for FAN2110
FAN2110 Summary of contents
Page 1
... FAN2110EMPX -40°C to 85°C © 2008 Fairchild Semiconductor Corporation FAN2110 • Rev. 1.0.3 Description The FAN2110 TinyBuck™ highly efficient, small footprint, constant IN synchronous Buck regulator. The FAN2110 contains both synchronous MOSFETs and a controller/driver with optimized interconnects in ...
Page 2
... Typical Application IN + RAMP Power Good Enable R ILIM Block Diagram © 2008 Fairchild Semiconductor Corporation FAN2110 • Rev. 1.0.3 P2 Boot Diode VCC 15 RAMP 25 PGOOD PWM ILIM + 17 DRIVER T R(T) 18 COMP 20 AGND 16 Figure 1. Typical Application Diagram Figure 2. Block Diagram ...
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 FAN2110 • Rev. 1.0.3 BOOT ) from this pin to AGND can be used to program the current- ILIM ) from this pin to AGND sets the PWM switching T ...
Page 4
... Power Dissipation Note: 1. Typical thermal resistance when mounted on a four-layer, two-ounce PCB, as shown in Figure 35. Actual results are dependent on mounting method and surface related to the design. © 2008 Fairchild Semiconductor Corporation FAN2110 • Rev. 1.0.3 Conditions Conditions VCC to AGND VIN to PGND FAN2110MPX FAN2110EMPX ...
Page 5
... Under-Voltage Shutdown UVSD V Fault Discharge Threshold FLT V Fault Discharge Hysteresis FLT_HYS Soft-Start Regulation (T0.8) SS OUT t Fault Enable/SSOK (T1.0) EN © 2008 Fairchild Semiconductor Corporation FAN2110 • Rev. 1.0.3 Conditions SW=Open, V =0.7V =600KHz SW Shutdown: EN= Rising V CC Hysteresis R =50K to GND T R =24K to GND ...
Page 6
... V PGOOD Output Low PG_LO I PGOOD Leakage Current PG_LK Notes: 2. Specifications guaranteed by design and characterization; not production tested. 3. Delay times are not tested in production. Guaranteed by design. © 2008 Fairchild Semiconductor Corporation FAN2110 • Rev. 1.0.3 (Continued) Conditions =5V CC Auto-Restart Mode < ...
Page 7
... R T Figure 6. Frequency vs. R 1.4 1.2 1 0.8 0.6 - Temperature (°C) Figure 8. R vs. Temperature, Normalized =5V), Figure © 2008 Fairchild Semiconductor Corporation FAN2110 • Rev. 1.0.3 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 ) Figure 7. T 1.04 1.02 Q1 ~0.32%/°C 1.00 Q2 ~0.35%/° ...
Page 8
... Application Circuits +5V 2.2u X5R V OUT 34 2.49K 5.6n 5.6n 182K 2.80K 3.3n Figure 10. Application Circuit: 1.5V Figure 11. Application Circuit: 1.5V © 2008 Fairchild Semiconductor Corporation FAN2110 • Rev. 1.0.3 FAN2110 VIN VCC P2 15 10K PGOOD 13 RAMP 2.49K COMP 20 120p BOOT ILIM R(T) 18 30.1K AGND PGND P3 16 ...
Page 9
... Load Current (Amps) Figure 16. 2.5V Efficiency ,600KHz OUT Note: 4. Circuit values for this configuration change in Figure 10. © 2008 Fairchild Semiconductor Corporation FAN2110 • Rev. 1.0.3 =12V 100 VIN = 10V VIN = 12V 75 VIN = 16V VIN = 20V ...
Page 10
... Demo Board) 100 Load Current (Amps) Figure 22. Peak MOSFET Temperatures, 3.3V Output Note: 5. Circuit values for this configuration change in Figure 10. © 2008 Fairchild Semiconductor Corporation FAN2110 • Rev. 1.0.3 (Continued) =12V 2.5 2 1.5 1 VIN=10V_HS VIN=10V_LS 0.5 VIN=20V_HS VIN=20V_LS ...
Page 11
... Figure 24. Startup, 10A Load PGOOD Figure 26. Shutdown, 10A Resistive Load V , 200mV/div OUT I 5A/Div OUT, Figure 28. Transient Response, 0-8A Load µs Slew Rate © 2008 Fairchild Semiconductor Corporation FAN2110 • Rev. 1.0.3 (Continued) =12V OUT EN PGOOD Figure 25. Startup with 1.0V Pre-Bias OUT EN Figure 27. ...
Page 12
... If the parallel combination of R1 and R internal SS ramp is not released and the regulator does not start. Enable FAN2110 has an internal pull-up to the enable (EN) pin so that the IC is enabled once V threshold. Connecting a small capacitor across EN and AGND delays the rate of voltage rise on the EN pin. The EN pin also serves for the restart whenever a fault occurs (refer to the Auto-Restart section) ...
Page 13
... After a fault, EN pin is discharged by a 1µA current sink to a 1.1V threshold before the internal 800K pull-up is restored. A new soft-start cycle begins when EN charges above 1.35V. Depending on the external circuit, the FAN2110 can be configured to remain latched-off or to automatically restart after a fault. Table 1. Fault / Restart Configurations ...
Page 14
... Application Information Bias Supply The FAN2110 requires a 5V supply rail to bias the IC and provide gate-drive energy. Connect a 2.2µf X5R or X7R decoupling capacitor between VCC and AGND. Since V is used to drive the internal MOSFET gates, CC supply current is frequency and voltage dependent. ...
Page 15
... For type-2 compensation, eliminate R3 and C3. © 2008 Fairchild Semiconductor Corporation FAN2110 • Rev. 1.0.3 Since the FAN2110 employs summing current-mode architecture, type-2 compensation can be used for many applications. For applications that require wide loop bandwidth and/or use very low-ESR output capacitors, type-3 compensation may be required ...
Page 16
... Fairchild products. Always visit Fairchild Semiconductor’s online packaging area for the most recent package drawings: http://www.fairchildsemi.com/packaging/. © 2008 Fairchild Semiconductor Corporation FAN2110 • Rev. 1.0.3 2X ALL VALUES TYPICAL EXCEPT WHERE NOTED A) DIMENSIONS ARE IN MILLIMETERS. B) DIMENSIONS AND TOLERANCES PER ...
Page 17
... Fairchild Semiconductor Corporation FAN2110 • Rev. 1.0.3 17 www.fairchildsemi.com ...