FAN2011

FAN2011_06 FAIRCHILD | Alldatasheet

Document overview

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Technical content

Features

95% Efficiency, Synchronous Operation Adjustable Output Voltage from 0.8V to V IN 4.5V to 5.5V Input Voltage Range Up to 1.5A Output Current Fixed Frequency 1.3 MHz PWM Operation 100% Duty Cycle Low Dropout Operation (LDO) Soft Start Excellent Load Transient Response 3x3mm 6-lead MLP Package

Applications

Description

The FAN2011/FAN2012 is a high-efficiency, low-noise synchronous Pulse Width Modulated (PWM) current mode DC-DC converter, designed for low voltage appli- cations. It provides up to 1.5A continuous load current 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 shut- down 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, inexpensive 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, making it possible to build a 1.5A complete DC-DC con- verter in a tiny space on the PCB.

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 FAN2011EMPX FAN2012I Adjustable 3x3mm 6-Lead MLP -40°C to 85°C FAN2012EMPX

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.

2 PGND

m ust be externally connected to AGND. 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. m ust be externally connected to AGND. This pin is connected to the internal MOSFET switches. This pin is connected to the internal MOSFET switches. the supply current to less than 1µA. Do not float this pin.

www.fairchildsemi.com FAN2011/FAN2012 Rev. 1.0.4 FAN2011/FAN2012 1.5A Low Voltage Current Mode Synchronous PWM Buck Regulator Absolute Maximum Ratings 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. Recommended Operating Conditions Notes: 1. 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. 2. Using Mil Std. 883E, method 3015.7(Human Body Model) and EIA/JESD22C101-A (Charge Device Model). 3. 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 ), 3mm x 3mm 6-lead MLP (1) –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 (2) 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 (3) – 3.3 – µ H Input Capacitor (3) –1 0– µ F Output Capacitor (3) –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. 1.0.4 FAN2011/FAN2012 1.5A Low Voltage Current Mode Synchronous PWM Buck Regulator

Electrical Characteristics

Notes: 4. Load transient response test waveform. Additional Electrical Characteristics for FAN2012 Figure 3. Load Transient Response Test Waveform

0.6 Time (mSec)

www.fairchildsemi.com FAN2011/FAN2012 Rev. 1.0.4 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 4 06 08 0 100 120 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 Ou tput Voltage vs. Ambient Temperature Ambien t Temperature (°C) Output Voltage (V) 02 0 4 06 08 0 1 0 0 1 2 0 1230 1235 1240 1245 1250 1255 Ambient Temp erature (°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. 1.0.4 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 current ramps up and is monitored via an internal circuit. and input voltage is at maximum. input current is typically 350mA. at which point, the circuit restarts.

Table 1. Recommended Inductors ple and the transient response. Table 2. Recommended Capacitors load current, the higher the switching spikes. be routed away from the inductor to avoid RF coupling. Figure 5. Recommended PCB Layout

FAN2011/FAN2012 1.5A Low Voltage Current Mode Synchronous PWM Buck Regulator Mechanical Dimensions 3x3mm 6-Lead MLP

FAN2011/FAN2012 1.5A Low Voltage Current Mode Synchronous PWM Buck Regulator DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY , FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. TRADEMARKS The following are registered and unregistered trademarks Fairchild Semiconductor owns or is authorized to use and is not intended to be an exhaustive list of all such trademarks. LIFE SUPPORT POLICY FAIRCHILDíS PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, or (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in significant injury to the user. 2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. PRODUCT STATUS DEFINITIONS Definition of Terms Datasheet Identification Product Status Definition Advance Information Preliminary No Identification Needed Obsolete This datasheet contains the design specifications for product development. Specifications may change in any manner without notice. This datasheet contains preliminary data, and supplementary data will be published at a later date. Fairchild Semiconductor reserves the right to make changes at any time without notice in order to improve design. This datasheet contains final specifications. Fairchild Semiconductor reserves the right to make changes at any time without notice in order to improve design. This datasheet contains specifications on a product that has been discontinued by Fairchild semiconductor. The datasheet is printed for reference information only. Formative or In Design First Production Full Production Not In Production ISOPLANAR™ LittleFET™ MICROCOUPLER™ MicroFET™ MicroPak™ MICROWIRE™ MSX™ MSXPro™ OCX™ OCXPro™ OPTOLOGIC OPTOPLANAR™ PACMAN™ POP™ Power247™ PowerEdge™ FAST FASTr™ FPS™ FRFET™ GlobalOptoisolator™ GTO™ HiSeC™ I 2C™ i-Lo™ ImpliedDisconnect™ IntelliMAX™ Rev. I18 ACEx™ ActiveArray™ Bottomless™ Build it Now™ CoolFET™ CROSSVOLT™ DOME™ EcoSPARK™ E 2CMOS™ EnSigna™ FACT™ FACT Quiet Series™ PowerSaver™ PowerTrench® QFET® QS™ QT Optoelectronics™ Quiet Series™ RapidConfigure™ RapidConnect™ µSerDes™ ScalarPump™ SILENT SWITCHER SMART START™ SPM™ Stealth™ SuperFET™ SuperSOT™-3 SuperSOT™-6 SuperSOT™-8 SyncFET™ TCM™ TinyLogic TINYOPTO™ TruTranslation™ UHC™ UltraFET UniFET™ VCX™ Wire™ Across the board. Around the world.™ The Power Franchise Programmable Active Droop™