FAN2011 FAIRCHILD | Alldatasheet
Document overview
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Technical content
Features
I 95% Efficiency, Synchronous Operation I Adjustable Output Voltage from 0.8V to V IN I 4.5V to 5.5V Input Voltage Range I Up to 1.5A Output Current I Fixed Frequency 1.3 MHz PWM Operation I 100% Duty Cycle Low Dropout Operation I Soft Start I Excellent Load Transient Response I 3x3mm 6-lead MLP Package
Applications
I Hard Disk Drive I Set Top Box I Point of Load Power I Notebook Computers I Communications Equipment
Description
The FAN2011/FAN2012 is a high-efficiency, low-noise synchro- nous PWM current mode DC-DC converter, designed for low voltage applications. It provides up to 1.5A continuous load cur- rent from the 4.5V to 5.5V input. The output voltage is adjust- able over a wide range of 0.8V to V IN by means of an external voltage divider. The FAN2011 is always on, while the FAN2012 has an “Enable Input,” and the device can be put in the shutdown mode, in which the ground current falls below 1µA. A current mode control loop with a fast transient response ensures excellent line and load regulation. The fixed 1.3MHz switching frequency enables the user to choose a small, inex- pensive external inductor and capacitor. Filtering is also easily accomplished with very small components. Protection features include input under-voltage lockout, short circuit protection and thermal shutdown. Soft-start limits in-rush current during start-up conditions. The device is available in a 3x3mm 6-lead MLP package, mak- ing it possible to build a 1.5A complete DC/DC converter in a tiny space on the PCB. Typical Application Figure 1. Typical Application
Figure 2. Pin Assignment P1 must be soldered to the PCB ground. Adjustable voltage option, connect this pin to the resistor divider. This pin is connected to the internal MOSFET switches. This pin is connected to the internal MOSFET switches. This pin is not internally connected. P1 must be soldered to the PCB ground. Adjustable voltage option, connect this pin to the resistor divider. This pin is connected to the internal MOSFET switches. This pin is connected to the internal MOSFET switches. current to less than 1µA. Do not float this pin.
www.fairchildsemi.com FAN2011/FAN2012 Rev. 1.0.2 FAN2011/FAN2012 1.5A Low Voltage Current Mode Synchronous PWM Buck Regulator Absolute Maximum Ratings (Note1) Recommended Operating Conditions Notes: 1. Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Absolute maximum ratings apply individually only, not in combination. Unless otherwise specified, all other voltages are referenced to AGND. 2. Junction to ambient thermal resistance, θ 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. 3. Using Mil Std. 883E, method 3015.7(Human Body Model) and EIA/JESD22C101-A (Charge Device Model). 4. Refer to the applications section for further details. Parameter Min Max Unit V IN -0.3 7 V PV IN and any other pin -0.3 V IN V Thermal Resistance-Junction to Tab ( θ JC ), 3mmx3mm 6-lead MLP (Note 2) 8 °C/W Lead Soldering Temperature (10 seconds) 260 °C Storage Temperature -65 150 °C Junction Temperature -40 150 °C Electrostatic Discharge (ESD) Protection Level (Note 3) HBM 4 kV CDM 2 Parameter Min Typ Max Unit Supply Voltage Range 4.5 5.5 V Output Voltage Range, Adjustable Version 0.8 V IN V Output Current 1500 mA Inductor (Note 4) 3.3 µ H Input Capacitor (Note 4) 10 µ F Output Capacitor (Note 4) 4 x 10 µ F Operating Ambient Temperature Range FAN2011 and FAN2012 0 +85 °C FAN2011I and FAN2012I -40 +85
www.fairchildsemi.com FAN2011/FAN2012 Rev. 1.0.2 FAN2011/FAN2012 1.5A Low Voltage Current Mode Synchronous PWM Buck Regulator
Electrical Characteristics
Additional Electrical Characteristics for FAN2012 Notes: 5. Load transient response test waveform. Figure 3. Load Transient Response Test Waveform
0.6 Time (mSec)
www.fairchildsemi.com FAN2011/FAN2012 Rev. 1.0.2 FAN2011/FAN2012 1.5A Low Voltage Current Mode Synchronous PWM Buck Regulator Typical Performance Characteristics T A = 25°C, C IN = 10µF , C OUT = 40µF , L = 3.3µH, V IN = 5V, unless otherwise noted. 10 100 1000 1000 0 100 -40 -20 0 20 40 60 80 100 120 1.194 1.196 1.198 1.200 1.202 1.204 1.206 1.208 1.210 1.212 214 Temp ( ∞C) vs Vout@0 mA Temp ( ∞C) vs Vout@100mA Temp ( ∞C) vs Vout@ 500 mA Temp ( ∞C) vs Vout@1000 mA Temp ( ∞C) vs Vout@1500 mA Output Voltage vs. Ambient Temperature Ambient Temperature (°C) Output Voltage (V) 0 2 04 06 08 0 1 0 0 1 2 0 1230 1235 1240 1245 1250 1255 12 60 Ambient Temperature (°C) Switching Frequency (KHz) Switching Frequency vs. Ambient Temperature Load Current (mA) Power Efficiency (%) Efficiency vs. Load Current VIN = 5.5V VIN = 4.5V VIN = 5V VOUT = 3.3V VOUT = 1.2V
www.fairchildsemi.com FAN2011/FAN2012 Rev. 1.0.2 FAN2011/FAN2012 1.5A Low Voltage Current Mode Synchronous PWM Buck Regulator Typical Performance Characteristics (Continued) T A = 25°C, C IN = 10µF , C OUT = 40µF , L = 3.3µH, V IN = 5V, unless otherwise noted. Start-up Response Time (50µs/div) Inductor (200mA/div) SW Node (5V/div) Output (500mV/div) VOUT = 1.2V IOUT = 100mA Voltage Voltage Current Input (5V/div) Voltage 100mA Start-up Response Time (100µs/div) Inductor (200mA/div) SW Node (5V/div) VOUT = 3.3V IOUT = 100mA Voltage Current Input (5V/div) Voltage Start-up Response Time (100µs/div) Inductor (500mA/div) SW Node (5V/div) Output (500mV/div) VOUT = 1.2V IOUT = 1500mA Voltage Voltage Current Input (5V/div) Voltage Start-up Response Time (100µs/div) Inductor (500mA/div) SW Node (5V/div) VOUT = 3.3V IOUT = 1500mA Voltage Current Input (5V/div) Voltage Output (1V/div) Voltage Transient Response Time (5µs/div) Inductor (200mA/div) SW Node (5V/div) Voltage Current Load Current Output (20mV/div) Voltage VOUT = 1.2V Transient Response Time (5µs/div) Inductor (200mA/div) SW Node (5V/div) Voltage Current Load Current Output (20mV/div) Voltage Output (1V/div) Voltage 700mA 700mA 100mA VOUT = 1.2V
Figure 4. Block Diagram mum and input voltage is at maximum. capacitor and a load current of 1500mA is 800µs. circuit will be allowed to restart.
higher the switching spikes. Figure 5. Recommended PCB Layout
FAN2011/FAN2012 1.5A Low Voltage Current Mode Synchronous PWM Buck Regulator Mechanical Dimensions 3x3mm 6-Lead MLP
Ordering Information
Product Number Output Voltage Package Type Ambient Operating Temperature Order Code FAN2011 Adjustable 3x3mm 6-Lead MLP 0 °C to 85°C FAN2011MPX FAN2012 Adjustable 3x3mm 6-Lead MLP 0 °C to 85°C FAN2012MPX FAN2011I Adjustable 3x3mm 6-Lead MLP -40 °C to 85°C FAN2011IMPX FAN2012I Adjustable 3x3mm 6-Lead MLP -40 °C to 85°C FAN2012IMPX
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