FAN2012 ONSEMI | Alldatasheet
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© 2004 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN2012 • Rev. 1.0.5 FAN 2012 — 1.5 A Low-Voltage, Current-Mode Synchronous PWM Buck Regulator FAN2012
1.5 A Low-Voltage, Current-Mode Synchronous PWM
Features
95% Efficiency, Synchronous Operation Adjustable Output Voltage from 0.8 V to 3.5 V 4.5 V to 5.5 V Input Voltage Range Up to 1.5 A Output Current Fixed-Frequency 1.3 MHz PWM Operation Soft Start Excellent Load Transient Response 3 x 3 mm, 6-Lead, MLP
Applications
Hard Disk Drive Set-Top Box Point-of-Load Power Notebook Computer Communications Equipment
Description
The FAN2012 is a high -efficiency, low -noise, synchronous Pulse Width Modulated (PWM) current - mode DC -DC converter designed for low -voltage applications. I t provides up to 1.5 A continuous -load current from the 4.5 V to 5.5 V input. The output voltage is adjustable over a wide range of 0.8 V to 3.5 V by means of an external voltage divider. The FAN2012 has an “Enable Input” and the device can be put in shutdown mode, in which the ground current falls below 1 µA. A cu rrent-mode control loop with a fast transient response ensures excellent line and load regulation. The fixed 1.3 MHz switching frequency enables designers to choose a small, inexpensive exter nal inductor and capacitor. Filtering is easily accomplished with very small components. Protection features include inp ut under-voltage lockout, short-circuit protection , and thermal shutdown. Soft - start limits inrush current during start-up conditions. The device is available in a 3x3 mm 6 -lead molded leadless package (MLP), making it possible to build a
1.5 A complete DC-DC converter in limited space on the
printed circuit board (PCB).
Ordering Information
Part Number Output Voltage Operating Temperature Range Package FAN2012MPX Adjustable 0°C to 85°C 3x3 mm 6-Lead MLP FAN2012EMPX Adjustable -40°C to 85°C 3x3 mm 6-Lead MLP
© 2004 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN2012 • Rev. 1.0.5 3 FAN 2012 — 1.5 A Low-Voltage, Current-Mode Synchronous PWM Buck Regulator Absolute Maximum Ratings Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be operable above the recom mended 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 onl y. Symbol Parameter Min. Max. Unit VIN Input Voltage -0.3 6.5 V VIN Input Voltage on PVIN and Any Other Pin -0.3 VIN V JC Thermal Resistance-Junction to Tab(1) 8 °C/W TL Lead Soldering Temperature (10 Seconds) 260 °C TSTG Storage Temperature -65 150 °C TJ Junction Temperature -40 150 °C ESD Electrostatic Discharge Protection Level(2) HBM 4 kV CDM 2 Notes: 1. Junction-to-ambient thermal resistance, JA, is a strong function of PCB material, board thickness, thickness and number of copper planes, number of via used, diameter of via used, available copper surface, and attached heat sink characteristics. 2. Using Mil Std. 883E, method 3015.7 (Human Body Model) and EIA/JESD22C101-A (Charged Device Model). 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. Symbols Parameter Min. Typ. Max. Unit VIN Supply Voltage Range 4.5 5.5 V VOUT Output Voltage Range, Adjustable Version 0.8 3.5 V IOUT Output Current 1.5 A L Inductor(3) 3.3 µH CIN Input Capacitor(3) 10 µF COUT Output Capacitor(3) 4 x 10 µF TA Operating Ambient Temperature Range FAN2012MPX 0 +85 °C FAN2012EMPX -40 +85 °C Notes: 3. Refer to the Applications section for details.
© 2004 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN2012 • Rev. 1.0.5 4 FAN 2012 — 1.5 A Low-Voltage, Current-Mode Synchronous PWM Buck Regulator
Electrical Characteristics
VIN = 4.5 V to 5.5 V, VOUT = 1.2 V, IOUT = 200 mA, CIN = 10 µF, COUT = 4 x 10 µF, L = 3.3 µH, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = 25°C. Symbol Parameter Conditions Min. Typ. Max. Units VIN Input Voltage 4.5 5.5 V IQ Quiescent Current IOUT = 0 mA 7 10 mA VUVLO UVLO Threshold VIN Rising 3.4 3.7 4.0 V Hysteresis 150 mV RON_PMOS PMOS On Resistance VIN = VGS = 5 V 150 290 M RON_NMOS NMOS On Resistance VIN = VGS = 5 V 150 290 TOVP Over-Temperature Protection Rising Temperature 150 °C Hysteresis 20 °C fSW Switching Frequency 1000 1300 1600 kHz RLINE Line Regulation VIN = 4.5 to 5.5 V, IOUT = 100 mA 0.16 %/V RLOAD Load Regulation 0 mA ≤ IOUT ≤ 1500 mA 0.2 0.5 % VOUT Output Voltage During Load Transition(4) IOUT from 700 mA to 100 mA 5 % IOUT from 100 mA to 700 mA -5 % ILEAK Reverse Leakage Current into Pin SW VIN = Open, EN = GND, VSW = 5.5 V 0.1 1.0 µA VREF Reference Voltage 0.8 V VOUT Output Voltage Accuracy VIN = 4.5 to 5.5 V, 0 mA ≤ IOUT ≤ 1500 mA FAN2012MPX -2 2 % FAN2012EMPX -3 3 % ISD Shutdown Mode Supply Current VEN = 0 V 0.1 1.0 µA IBIAS EN Bias Current 0.1 µA VENH EN HIGH Voltage 1.3 V VENL EN LOW Voltage 0.4 V Notes: 4. Please refer to the load transient response test waveform shown in Figure 3. Figure 3. Load Transient Response Test Waveform
Figure 13. Block Diagram voltage is at minimum and input voltage is at maximum. capacitor and a load current of 1500 mA is 800 µs. therefore the average input current is typically 350 mA. 130°C, at which point, the circuit restarts.
calculated value of R1 is 8.87 k. performance are saturation current and DC resistance.
1 VOU T VIN⁄( )–
Table 1. Recommended Inductors output ripple and the transient response. Table 2. Recommended Capacitors be routed away from the inductor to avoid RF coupling. recommended PCB layout is shown below in Figure 14. Figure 14. Recommended PCB Layout
B. DIMENSIONS ARE IN MILLIMETERS.
0.10 C A B
0.8 MAX
0.95 TYP
0.2 MIN
0.45 TYP
Figure 15. 3x3 mm, 6-Lead, Molded Leadless Package (MLP) specifically the warranty therein, which covers Fairchild products. http://www.fairchildsemi.com/dwg/ML/MLP06F.pdf.
© 2004 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN2012 • Rev. 1.0.5 10 FAN 2012 — 1.5 A Low-Voltage, Current-Mode Synchronous PWM Buck Regulator
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