FAN2108 — TinyBuck™ 3-24V Input, 8A, High-Efficiency, Integrated Synchronous Buck Regulator Features Description Wide Input Voltage Range: 3V-24V The FAN2108 TinyBuck™ is a highly efficient, small footprint, 8A, synchronous buck regulator. Over 95% Peak Efficiency Internal Bootstrap diode Internal Soft-Start Wide Output Voltage Range: 0.8V to 80% VIN 8A Output Current Programmable Frequency Operation: 200KHz to 600KHz Integrated Schottky Diode on Low-side MOSFET Boosts Efficiency External compensation, programmable switching 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. 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 5x6mm, 25-Pin, 3-Pad MLP Package The FAN2108 contains both synchronous MOSFETs and a controller/driver with optimized interconnects in one package, which enables designers to solve highcurrent requirements in a small area with minimal external components. Fairchild’s advanced BiCMOS power process, combined with low-RDS(ON) internal MOSFETs and a thermally efficient MLP package, provide the ability to dissipate high power in a small package. Output over-voltage, under-voltage, and thermal shutdown protections help protect the device from damage during fault conditions. FAN2108 prevents prebiased output discharge during startup in point-of-load applications. Applications Servers Point-of-Load Regulation High-End Computing Systems Graphics Cards Battery-Powered Equipment Set-Top Boxes Ordering Information Part Number Operating Temperature Range Package Eco Status Packing Method FAN2108MPX FAN2108EMPX -10°C to 85°C -40°C to 85°C Molded Leadless Package (MLP) 5x6mm Molded Leadless Package (MLP) 5x6mm Green Green Tape and Reel Tape and Reel For Fairchild’s definition of “green” Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html. © 2008 Fairchild Semiconductor Corporation FAN2108 • Rev. 1.0.0 www.fairchildsemi.com FAN2108 — TinyBuck™, 3-24V Input, 8A, High-Efficiency, Integrated Synchronous Buck Regulator September 2008 Figure 1. Typical Application Diagram Block Diagram FAN2108 — TinyBuck™, 3-24V Input, 8A, High-Efficiency, Integrated Synchronous Buck Regulator Typical Application Figure 2. Block Diagram © 2008 Fairchild Semiconductor Corporation FAN2108 • Rev. 1.0.0 www.fairchildsemi.com 2 Figure 3. MLP 5x6mm Pin Configuration (Bottom View) Pin Definitions Pin # Name Description P1, 6-12 SW Switching Node. P2, 2-5 VIN Power Input Voltage. Connect to the main input power source. P3, 21-23 PGND Power Ground. Power return and Q2 source. 1 BOOT High-Side Drive BOOT Voltage. Connect through capacitor (CBOOT) to SW. The IC includes an internal synchronous bootstrap diode to recharge the capacitor on this pin to VCC when SW is LOW. 13 PGOOD Power-Good Flag. An open-drain output that pulls LOW when FB is outside a ±10% range of the reference. PGOOD does not assert HIGH until the fault latch is enabled. 14 EN ENABLE. Enables operation when pulled to logic HIGH or left open. Toggling EN resets the regulator after a latched fault condition. This input has an internal pull-up when the IC is functioning normally. When a latched fault occurs, EN is discharged by a current sink. 15 VCC 16 AGND 17 ILIM Current Limit. A resistor (RILIM) from this pin to AGND can be used to program the currentlimit trip threshold lower than the default setting. 18 R(T) Oscillator Frequency. A resistor (RT) from this pin to AGND sets the PWM switching frequency. 19 FB Output Voltage Feedback. Connect through a resistor divider to the output voltage. 20 COMP Compensation. Error amplifier output. Connect the external compensation network between this pin and FB. 24 NC 25 RAMP Input Bias Supply for IC. The IC’s logic and analog circuitry are powered from this pin. Analog Ground. The signal ground for the IC. All internal control voltages are referred to this pin. Tie this pin to the ground island/plane through the lowest impedance connection. FAN2108 — TinyBuck™, 3-24V Input, 8A, High-Efficiency, Integrated Synchronous Buck Regulator Pin Configuration No Connect. This pin is not used. Ramp Amplitude. A resistor (RRAMP) connected from this pin to VIN sets the ramp amplitude and provides voltage feedforward functionality. © 2008 Fairchild Semiconductor Corporation FAN2108 • Rev. 1.0.0 www.fairchildsemi.com 3 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 to stresses above the recommended operating conditions may affect device reliability. The absolute maximum ratings are stress ratings only. Parameter Conditions Min. VIN to PGND VCC to AGND AGND=PGND SW to PGND Continuous ESD 28 V 6 V V -0.3 6.0 V -0.5 24.0 V -5 30 V -0.3 VCC+0.3 V Transient (t < 20ns, f < 600KHz) All other pins Unit 35 BOOT to PGND BOOT to SW Max. Human Body Model, JEDEC JESD22-A114 kV 2 Charged Device Model, JEDEC JESD22-C101 2.5 Recommended Operating Conditions The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not recommend exceeding them or designing to absolute maximum ratings. Symbol Parameter Conditions Min. Typ. Max. Unit 5.0 VCC Bias Voltage VCC to AGND 4.5 5.5 V VIN Supply Voltage VIN to PGND 3 24 V TA Ambient Temperature FAN2108MPX -10 +85 °C FAN2108EMPX -40 +85 °C TJ Junction Temperature +125 °C f Switching Frequency 600 kHz Max. Unit +150 °C Thermal Information Symbol TSTG Parameter Min. Storage Temperature Typ. -65 TL Lead Soldering Temperature, 10 Seconds +300 °C TVP Vapor Phase, 60 Seconds +215 °C Infrared, 15 Seconds +220 °C TI P1 (Q2) θJC θJ-PCB PD Thermal Resistance: Junction-to-Case Power Dissipation, TA=25°C °C/W P2 (Q1) 7 °C/W P3 4 °C/W 35 °C/W Thermal Resistance: Junction-to-Mounting Surface (1) 4 (1) 2.8 FAN2108 — TinyBuck™, 3-24V Input, 8A, High-Efficiency, Integrated Synchronous Buck Regulator Absolute Maximum Ratings W Note: 1. 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. 1.0.0 www.fairchildsemi.com 4 Electrical specifications are the result of using the circuit shown in Figure 1 unless otherwise noted. Symbol Parameter Conditions Min. Typ. Max. Unit Power Supplies ICC VUVLO VCC Current SW=Open, FB=0.7V, VCC=5V, fSW =600KHz 8 12 mA Shutdown: EN=0, VCC=5V 7 10 µA 4.3 4.5 V Rising VCC VCC UVLO Threshold 4.1 Hysteresis 300 mV Oscillator f tON VRAMP tOFF Frequency Minimum On-Time 255 300 345 KHz RT=24KΩ 540 600 660 KHz 50 65 ns (2) Ramp Amplitude, peak-to–peak Minimum Off-Time RT=50KΩ 16VIN, 1.8VOUT, RT=30KΩ, RRAMP=200KΩ 0.53 (2) 100 V 150 ns Reference VFB Reference Voltage (see Figure 4 for Temperature Coefficient) FAN2108MPX, 25°C 794 800 806 mV FAN2108EMPX, 25°C 795 800 805 mV 80 85 dB 12 15 MHz Error Amplifier G BW VCOMP ISINK ISOURCE IBIAS DC Gain (2) Gain Bandwidth Product (2) VCC=5V Output Voltage 0.4 3.2 V Output Current, Sourcing VCC=5V, VCOMP=2.2V 1.5 2.2 mA Output Current, Sinking VCC=5V, VCOMP=1.2V 0.8 1.2 mA FB Bias Current VFB=0.8V, 25°C -850 -650 -450 nA Protection and Shutdown ILIM Current Limit IILIM ILIM Current TTSD Over-Temperature Shutdown THYS Over-Temperature Hysteresis RILIM Open at 25°C (see Circuit Description) 12 15 18 A -11 -10 -9 µA Internal IC Temperature +155 °C +30 °C VOVP Over-Voltage Threshold Two Consecutive Clock Cycles 110 115 121 %VOUT VUVLO Under-Voltage Shutdown 16 Consecutive Clock Cycles 68 73 78 %VOUT VFLT Fault Discharge Threshold Measured at FB Pin 250 mV VFLT_HYS Fault Discharge Hysteresis Measured at FB Pin (VFB ~500mV) 250 mV 5.3 ms 6.7 ms FAN2108 — TinyBuck™, 3-24V Input, 8A, High-Efficiency, Integrated Synchronous Buck Regulator Electrical Specifications Soft-Start tSS VOUT to Regulation (T0.8) tEN Fault Enable/SSOK (T1.0) Frequency=600KHz Note: 2. Specifications guaranteed by design and characterization; not production tested. © 2008 Fairchild Semiconductor Corporation FAN2108 • Rev. 1.0.0 www.fairchildsemi.com 5 Recommended operating conditions are the result of using the circuit shown in Figure 1 unless otherwise noted. Symbol Parameter Conditions Min. Typ. Max. Unit EN Threshold, Rising 1.35 V EN Hysteresis 250 mV 800 KΩ 1 µA Control Functions VEN_R VEN_HYS REN EN Pull-Up Resistance IEN EN Discharge Current RFB FB OK Drive Resistance VPG PGOOD Threshold VPG_L PGOOD Output Low © 2008 Fairchild Semiconductor Corporation FAN2108 • Rev. 1.0.0 Auto-Restart Mode 2.00 800 FB < VREF -14 -11 -8 FB > VREF +7 +10 +13.5 IOUT < 2mA 0.4 Ω %VREF V FAN2108 — TinyBuck™, 3-24V Input, 8A, High-Efficiency, Integrated Synchronous Buck Regulator Electrical Specifications (Continued) www.fairchildsemi.com 6 1.20 1.005 1.10 I FB V FB 1.010 1.000 0.995 1.00 0.90 0.990 0.80 -50 0 50 100 150 -50 0 Temperature (oC) Figure 4. Reference Voltage (VFB) vs. Temperature, Normalized 1200 1.01 Frequency Frequency (KHz) 150 1.02 900 600 600KHz 1.00 300KHz 0.99 300 0.98 0 0 20 40 60 80 100 120 -50 140 0 RT (KΩ) 100 150 Temperature ( C) Figure 7. 1.04 1.2 1.02 I ILIM 1.4 Q1 ~0.32%/°C 1 50 o Figure 6. Frequency vs. RT RDS 100 Figure 5. Reference Bias Current (IFB) vs. Temperature, Normalized 1500 Q2 ~0.35%/°C Frequency vs. Temperature, Normalized 1.00 0.98 0.8 0.6 -50 50 Temperature (oC) 0.96 0 50 100 150 -50 50 100 150 o Temperature ( C) Temperature (°C) Figure 9. Figure 8. RDS vs. Temperature, Normalized (VCC=VGS=5V) © 2008 Fairchild Semiconductor Corporation FAN2108 • Rev. 1.0.0 0 FAN2108 — TinyBuck™, 3-24V Input, 8A, High-Efficiency, Integrated Synchronous Buck Regulator Typical Characteristics ILIM Current (IILIM) vs. Temperature, Normalized www.fairchildsemi.com 7 Figure 10. Application Circuit: 1.8VOUT, 500KHz Typical Performance Characteristics Typical operating characteristics using the circuit shown in Figure 10. VIN=12V, VCC=5V, unless otherwise specified. 0 Efficiency @ Vo=1.8V, fsw=500KHz, Ta=25 C 0 Efficiency @ Vo=3.3V, fsw=300KHz, Ta=25 C 100 95 95 Efficiency (%) Efficiency (%) 90 85 Vin=8V Vin=12V 80 Vin=16V Vin=20V 75 70 2 Vin=10V Vin=12V 80 Vin=14V 4 6 Vin=20V 70 8 0 Load Current (A) Figure 11. Vin=5V 85 75 Vin=24V 0 90 1.8VOUT Efficiency Over VIN vs. Load 2 4 Load Current (A) 6 8 Figure 12. 3.3VOUT Efficiency Over VIN vs. Load Efficiency@ Vin=12V, Vo=1.8V Load Regulation @ Vo=0.8V, 500kHz, 25°C 0.8012 Vin=8V 0.801 90 Output Voltage (V) Efficiency (%) 95 85 80 300KHz 500KHz 75 600KHz Vin=12V 0.8008 Vin=16V 0.8006 Vin=20V 0.8004 Vin=24V FAN2108 — TinyBuck™, 3-24V Input, 8A, High-Efficiency, Integrated Synchronous Buck Regulator Application Circuit 0.8002 0.8 0.7998 0.7996 70 0.7994 0 1 2 3 4 5 6 7 0.7992 8 0 Load Current (A) 2 3 4 5 6 7 8 Load Current (A) Figure 13. 1.8VOUT Efficiency Over Frequency vs. Load © 2008 Fairchild Semiconductor Corporation FAN2108 • Rev. 1.0.0 1 Figure 14. 0.8VOUT Load Regulation Over VIN vs. Load www.fairchildsemi.com 8 Typical operating characteristics using the circuit shown in Figure 10. VIN=12V, VCC=5V, unless otherwise specified. VOUT VOUT SW PGOOD EN EN Figure 15. Startup, 3A Load Figure 16. Startup with 1V Pre-Bias on Vout SW VOUT PGOOD EN EN Figure 17. Shutdown, 1A Load Figure 18. Restart on Fault HS and LS MOSFET Temperature 90 VOUT LSFET@ 20Vin T emp e ra tu re ( ° C) 80 IOUT LSFET@ 12Vin HSFET@ 20Vin 70 HSFET@ 12Vin 60 50 40 FAN2108 — TinyBuck™, 3-24V Input, 8A, High-Efficiency, Integrated Synchronous Buck Regulator Typical Performance Characteristics (Continued) 30 20 0 2 4 6 8 Load Current (A) Figure 20. MOSFET Temperature – Still Air at Room Temperature Figure 19. Transient Response, 2-8A Load © 2008 Fairchild Semiconductor Corporation FAN2108 • Rev. 1.0.0 www.fairchildsemi.com 9 Initialization Soft-Start Once VCC exceeds the UVLO threshold and EN is HIGH, the IC checks for an open or shorted FB pin before releasing the internal soft-start ramp (SS). 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. If R1 is open (Figure 1), the error amplifier output (COMP) is forced LOW and no pulses are generated. After the SS ramp times out (T1.0), an under-voltage latched fault occurs. To avoid skipping the soft-start cycle, it is necessary to apply VIN before VCC reaches its UVLO threshold. Soft-start time is a function of oscillator frequency. If the parallel combination of R1 and RBIAS is ≤ 1KΩ, the internal SS ramp is not released and the regulator does not start. EN 1.35V 2400 CLKs 0.8V Bias Supply FB The FAN2108 requires a 5V supply rail to bias the IC and provide gate-drive energy. Connect a ≥ 1.0µf X5R or X7R decoupling capacitor between VCC and PGND. Since VCC is used to drive the internal MOSFET gates, supply current is frequency and voltage dependent. Approximate VCC current (ICC) is calculated by: ICC ( mA ) = 4.58 + [( VCC − 5 + 0.013 ) • (f − 128)] 227 SS (1) 3200 CLKs T0.8 where frequency (f) is expressed in KHz. 4000 CLKs T1.0 Enable Figure 21. Soft-Start Timing Diagram FAN2108 has an internal pull-up to enable pin so that the IC is enabled once VCC is applied. Connecting a small capacitor across EN and AGND delays the rate of voltage rise on the EN pin. EN pin also serves for the restart whenever a fault occurs (refer to the AutoRestart section). For applications where sequencing is required, FAN2108 can be enabled (after the VCC comes up) with external control, as shown in Figure 20. The regulator does not allow the low-side MOSFET to operate in full synchronous rectification mode until internal SS ramp reaches 95% of VREF (~0.76V). This helps the regulator to start on a pre-biased output and ensures that inductor current does not "ratchet" up during the soft-start cycle. VCC UVLO or toggling the EN pin discharges the SS and resets the IC. FAN2108 14 EN Setting the Output Voltage The output voltage of the regulator can be set from 0.8V to 80% of VIN by an external resistor divider (R1 and RBIAS in Figure 1). 3.3n The internal reference is 0.8V with 650nA, sourced from the FB pin to ensure that, if the pin is open, the regulator does not start. Figure 20. Enabling with External Control Setting the Frequency The external resistor divider is calculated using: Oscillator frequency is determined by an external resistor, RT, connected between the R(T) pin and AGND. Resistance is calculated by: RT (KΩ ) = Fault Latch Enable 1.0V 0.8V (10 6 / f ) − 135 65 V − 0.8V 0.8V = OUT + 650nA RBIAS R1 FAN2108 — TinyBuck™, 3-24V Input, 8A, High-Efficiency, Integrated Synchronous Buck Regulator Circuit Description (3) Connect RBIAS between FB and AGND. (2) where RT is in KΩ and frequency (f) is in KHz. The regulator cannot start if RT is left open. © 2008 Fairchild Semiconductor Corporation FAN2108 • Rev. 1.0.0 www.fairchildsemi.com 10 Typically the inductor is set for a ripple current (ΔIL) of 10% to 35% of the maximum DC load. Regulators requiring fast transient response use a value on the high side of this range; while regulators that require very low output ripple and/or use high-ESR capacitors restrict allowable ripple current. L= VOUT ) VIN Δ IL • f VOUT • (1 - In case RILIM is not connected, the IC uses an internal default current-limit threshold. Loop Compensation The loop is compensated using a feedback network around the error amplifier. Figure 22 shows a complete type-3 compensation network. For type-2 compensation, eliminate R3 and C3. (4) where f is the oscillator frequency. Setting the Ramp Resistor Value The internal ramp voltage excursion (ΔVRAMP) during tON should be set to 0.6V at nominal operating point. RRAMP is approximately: RRAMP ( KΩ ) = (VIN − 1.8) • VOUT 18 x10 − 6 • VIN • f −2 (5) where frequency (f) is expressed in KHz. Figure 22. Compensation Network Since the FAN2108 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. Setting the Current Limit There are two levels of current-limit thresholds in FAN2108. The first level of protection is through an internal default limit set at the factory to limit output current beyond normal usage levels. The second level of protection is externally settable at the ILIM pin. Current-limit protection is enabled whenever the lower of the two thresholds is reached. FAN2108 uses its internal low-side MOSFET for current-sensing. The current-limit threshold voltage (VILIM) is compared to a scaled version of voltage drop across the low-side MOSFET, sampled at the end of each PWM offtime/cycle. The internal default threshold (with ILIM open) is temperature compensated. Protection The converter output is monitored and protected against extreme overload, short-circuit, over-voltage, under-voltage, and over-temperature conditions. An internal fault latch is set for any fault intended to shut down the IC. When the fault latch is set, the IC discharges VOUT by enhancing the low-side MOSFET until FB<0.25V. The MOSFET is not turned on again unless FB>0.5V. This behavior discharges the output without causing undershoot (negative output voltage). The ILIM pin can source a 10µA current that can be used to establish a lower, temperature–dependent, current-limit threshold by connecting a resistor (RILIM) between ILIM and AGND. RILIM can be approximated with the equation: RILIM(KΩ) = 95 + 3 • I out • KT • K1 + Vout • 3.33 • 10 Rramp • fsw Under-Voltage Shutdown 6 (6) where: I = Desired current limit setpoint in Amps; KT = Normalized temperature coefficient of the low-side MOSFET (Q2 from Figure 8); K1 = Overload co-efficient (use 1.2 to 1.4); VOUT = Set output voltage; Rramp = Ramp resistor used in KΩ; and fsw = Selected switching frequency in KHz. After 16 consecutive, pulse-by-pulse, current-limit cycles, the fault latch is set and the regulator shuts down. Cycling VCC or EN restores operation after a normal soft-start cycle (refer to Auto-Restart section). © 2008 Fairchild Semiconductor Corporation FAN2108 • Rev. 1.0.0 If voltage on the FB pin remains below the undervoltage threshold for 16 consecutive clock cycles, the fault latch is set and the converter shuts down. This protection is not active until the internal SS ramp reaches 1.0V during soft-start. Over-Voltage Protection / Shutdown FAN2108 — TinyBuck™, 3-24V Input, 8A, High-Efficiency, Integrated Synchronous Buck Regulator The over-current protection fault latch is active during the soft-start cycle. Use a 1% resistor for RILIM. Calculating the Inductor Value If voltage on the FB pin exceeds the over-voltage threshold for two consecutive clock cycles, the fault latch is set and shutdown occurs. A shorted high-side MOSFET condition is detected when SW voltage exceeds ~0.7V while the low-side MOSFET is fully enhanced. The fault latch is set immediately upon detection. The two fault protection circuits above are active all the time, including during soft-start. www.fairchildsemi.com 11 Over-Temperature Protection (OTP) After a fault, EN pin is discharged by a 1µA current sink to a 1.1V threshold before the internal 800KΩ pull-up is restored. A new soft-start cycle begins when EN charges above 1.35V. 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°C. Depending on the external circuit, the FAN2108 can be configured to remain latched-off or to automatically restart after a fault. Power-Good (PGOOD) Signal PGOOD is an open-drain output that asserts LOW when VOUT is out of regulation, as measured at the FB pin. Thresholds are specified in the Electrical Specifications section. PGOOD does not assert HIGH until the fault latch is enabled (T1.0). Table 1. Fault / Restart Configurations EN Pin Controller / Restart State Pull to GND Pull-up to VCC with 100K Open OFF (Disabled) No Restart – Latched OFF(After VCC Comes Up) Immediate Restart After Fault New Soft-Start Cycle After: tDELAY (ms)=3.9 • C(nf) Cap. to GND PCB Layout With EN is left open, restart is immediate. If auto-restart is not desired, tie the EN pin to the VCC pin or pull it HIGH after VCC comes up with a logic gate to keep the 1µA current sink from discharging EN to 1.1V. Figure 23 shows one method to pull up EN to VCC for a latch configuration. 15 VCC 100K Figure 24. Recommended PCB Layout FAN2108 14 EN 3.3n Figure 23. Enable Control with Latch Option © 2008 Fairchild Semiconductor Corporation FAN2108 • Rev. 1.0.0 FAN2108 — TinyBuck™, 3-24V Input, 8A, High-Efficiency, Integrated Synchronous Buck Regulator Auto-Restart www.fairchildsemi.com 12 2X TOP VIEW 2X RECOMMENDED LAND PATTERN ALL VALUES TYPICAL EXCEPT WHERE NOTED SIDE VIEW SEATING PLANE A) DIMENSIONS ARE IN MILLIMETERS. B) DIMENSIONS AND TOLERANCES PER ASME Y14.5M, 1994 C) DIMENSIONS DO NOT INCLUDE MOLD FLASH OR BURRS. D) DESIGN BASED ON JEDEC MO-220 VARIATION WJHC E) TERMINALS ARE SYMMETRICAL AROUND THE X & Y AXIS EXCEPT WHERE DEPOPULATED. F) DRAWING FILENAME: MKT-MLP25AREV2 BOTTOM VIEW Figure 25. 5x6mm Molded Leadless Package (MLP) 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. FAN2108 — TinyBuck™, 3-24V Input, 8A, High-Efficiency, Integrated Synchronous Buck Regulator Physical Dimensions Always visit Fairchild Semiconductor’s online packaging area for the most recent package drawings: http://www.fairchildsemi.com/packaging/. © 2008 Fairchild Semiconductor Corporation FAN2108 • Rev. 1.0.0 www.fairchildsemi.com 13 FAN2108 — TinyBuck™, 3-24V Input, 8A, High-Efficiency, Integrated Synchronous Buck Regulator 14 www.fairchildsemi.com © 2008 Fairchild Semiconductor Corporation FAN2108 • Rev. 1.0.0