LMR61428 www.ti.com SNVS815 – JUNE 2012 LMR61428 SIMPLE SWITCHER® 14Vout, 2.85A Step-Up Voltage Regulator in MSOP Check for Samples: LMR61428 FEATURES APPLICATIONS • • • • • • • • • 1 2 1.2V to 14V Input Voltage Adjustable Output Voltage up to 14V Switch current up to 2.85A Up to 2 MHz Switching Frequency Low shutdown Iq, <1µA Cycle by cycle current limitting MSOP-8 packaging (3.0 x 5.0 x 1.09mm) WEBENCH® enabled • • • Boost/SEPIC conversions from 3.3V, 5V, and 12V Space constrained applications LCD displayed LED applications DESCRIPTION The LMR61428 is a step-up DC-DC switching regulator for battery-powered and low input voltage systems that can achieve efficiencies up to 90%. It has a wide input voltage range from 1.2V to 14V and a possible regulated output voltage range of 1.24V to 14V. It has an internal 0.17Ω N-Channel MOSFET power switch. The high switching frequency of up to 2MHz of the LMR61428 allows for tiny surface mount inductors and capacitors. Because of the unique constant-duty-cycle gated oscillator topology very high efficiencies are realized over a wide load range. The supply current is reduced to 80µA because of the BiCMOS process technology. In the shutdown mode, the supply current is less than 2.5µA. The LMR61428 is available in a Mini-SO-8 package. This package uses half the board area of a standard 8-pin SO and has a height of just 1.09 mm. Performance Benefits • • Extremely easy to use Tiny overall solution reduces system cost System Performance Figure 1. Efficiency vs Load Current, VOUT = 5V 84 82 EFFICIENCY (%) 80 78 76 74 72 Vin = 3.0V Vin = 3.2V Vin = 3.4V Vin = 3.6V Vin = 3.8V Vin = 4.0V 70 68 66 64 0.00 0.09 0.18 0.27 0.36 IOUT(A) 0.45 0.54 1 2 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. All trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Copyright © 2012, Texas Instruments Incorporated LMR61428 SNVS815 – JUNE 2012 www.ti.com Figure 2. Efficiency vs Load Current, VOUT = 3.3V 80 77 EFFICIENCY (%) 74 71 68 65 62 59 Vin = 2.0V Vin = 2.2V Vin = 2.5V Vin = 2.80 56 53 50 0.00 0.04 0.08 0.12 IOUT(A) 0.16 0.20 Typical Application Circuit Connection Diagram Mini SO-8 (MM) Package Figure 3. Top View Pin Functions Pin Description Pin 2 Name Function 1 PGND Power Ground 2 EN Active-Low Shutdown Input Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated Product Folder Links: LMR61428 LMR61428 www.ti.com SNVS815 – JUNE 2012 Pin Description (continued) Pin Name Function 3 FREQ Frequency Adjust. An external resistor connected between this pin and Pin 6 (VDD) sets the switching frequency of the LMR61428. 4 FB Output Voltage Feedback 5 SGND Signal Ground 6 VDD Power Supply for Internal Circuitry 7 BOOT Bootstrap Supply for the Gate Drive of Internal MOSFET Power Switch 8 SW Drain of the Internal MOSFET Power Switch These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. Absolute Maximum Ratings (1) −0.5 V to 14.5V SW Pin Voltage −0.5V to 10V BOOT, VDD, EN and FB Pins FREQ Pin 100µA θJA (2) 240°C/W TJmax (2) 150°C −65°C to +150°C Storage Temperature Range Lead Temp. (Soldering, 5 sec) Power Dissipation (TA=25°C) ESD Rating (1) (2) (3) 260°C (2) 500mW (3) 2kV Absolute maximum ratings indicate limits beyond which damage to the device may occur. Electrical specifications do not apply when operating the device outside of its rated operating conditions. The maximum power dissipation must be derated at elevated temperatures and is dictated by Tjmax (maximum junction temperature), θJA (junction to ambient thermal resistance), and TA (ambient temperature). The maximum allowable power dissipation at any temperature is Pdmax = (Tjmax - TA)/ θJA or the number given in the Absolute Maximum Ratings, whichever is lower. The human body model is a 100 pF capacitor discharged through a 1.5 kΩ resistor into each pin. For Pin 8 (SW) the ESD rating is 1.5 kV. Operating Conditions (1) VDD Pin 2.5V to 5V FB, EN Pins 0 to VDD BOOT Pin 0 to 10V −40°C to +85°C Ambient Temperature (TA) (1) Absolute maximum ratings indicate limits beyond which damage to the device may occur. Electrical specifications do not apply when operating the device outside of its rated operating conditions. Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated Product Folder Links: LMR61428 3 LMR61428 SNVS815 – JUNE 2012 www.ti.com Electrical Characteristics Limits in standard typeface are for TJ = 25°C, and limits in boldface type apply over the full operating temperature range of −40°C to +85°C. Unless otherwise specified: VDD= VOUT= 3.3V. Typ Max Units VIN_ST Symbol Minimum Start-Up Supply Voltage ILOAD = 0mA Parameter Condition Min 1.1 1.2 V VIN_OP Minimum Operating Supply Voltage (once started) 0.65 VFB FB Pin Voltage VOUT_MAX Maximum Output Voltage VHYST Hysteresis Voltage η Efficiency (1) ILOAD = 0mA 1.2028 1.24 V 1.2772 V 45 mV 14 (2) At Feedback Pin 30 VIN = 3.6V;VOUT = 5V;ILOAD = 0.5A 87 VIN = 2.5V;VOUT = 3.3V;ILOAD = 0.2A 87 60 V % D Switch Duty Cycle IDD Operating Quiescent Current (3) FB Pin > 1.3V; EN Pin at VDD 70 80 % 80 110 µA ISD Shutdown Quiescent Current (4) VDD, BOOT and SW Pins at 5.0V; EN Pin <200mV 0.01 2.5 ICL Switch Peak Current Limit 2.85 A RDS_ON MOSFET Switch On Resistance 0.17 Ω µA Enable Section VEN_LO EN Pin Voltage Low (5) VEN_HI EN Pin Voltage High (5) (1) (2) (3) (4) (5) 4 0.15VDD 0.7VDD V V Output in regulation, VOUT = VOUT (NOMINAL) ± 5% This is the hysteresis value of the internal comparator used for the gated-oscillator control scheme. This is the current into the VDD pin. This is the total current into pins VDD, BOOT, SW and FREQ. When the EN pin is below VEN_LO, the regulator is shut down; when it is above VEN_HI, the regulator is operating. Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated Product Folder Links: LMR61428 LMR61428 www.ti.com SNVS815 – JUNE 2012 Typical Performance Characteristics All curves taken at TA = 25°C, unless specified otherwise. Efficiency vs Load Current VOUT = 3.3V 84 80 82 77 80 74 78 EFFICIENCY (%) EFFICIENCY (%) Efficiency vs Load Current VOUT = 5.0V 76 74 72 Vin = 3.0V Vin = 3.2V Vin = 3.4V Vin = 3.6V Vin = 3.8V Vin = 4.0V 70 68 66 64 0.00 0.09 0.18 0.27 0.36 IOUT(A) 0.45 71 68 65 62 59 Vin = 2.0V Vin = 2.2V Vin = 2.5V Vin = 2.80 56 53 0.54 VFB vs Temperature 50 0.00 0.04 0.08 0.12 IOUT(A) 0.16 0.20 IOP vs Temperature ISD vs Temperature, VDD = 5V ISD vs VDD IOP vs VDD VIN_ST vs Load Current VOUT = 3.3V Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated Product Folder Links: LMR61428 5 LMR61428 SNVS815 – JUNE 2012 www.ti.com Switching Frequency vs RFQ Peak Inductor Current vs Load Current Minimum Input Voltage vs Load Current Steady State Operation VSW 5V/Div VOUT = 5V 50 mV/Div 10 Ps/DIV Simplified Block Diagram Figure 4. Block Diagram 6 Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated Product Folder Links: LMR61428 LMR61428 www.ti.com SNVS815 – JUNE 2012 Detailed Description OPERATING PRINCIPLE The LMR61428 is designed to provide step-up DC-DC voltage regulation in battery-powered and low-input voltage systems. It combines a step-up switching regulator, N-channel power MOSFET, built-in current limit, thermal limit, and voltage reference in a single 8-pin MSOP package. The switching DC-DC regulator boosts an input voltage between 1.2V and 14V to a regulated output voltage between 1.24V and 14V that is limited by a fixed maximum duty cylcle of 70%. The LMR61428 starts from a low 1.1V input and remains operational down to 0.65V. This device is optimized for use in cellular phones and other applications requiring a small size, low profile, as well as low quiescent current for maximum battery life during stand-by and shutdown. A high-efficiency gatedoscillator topology offers an output of up to 1A. Additional features include a built-in peak switch current limit, and thermal protection circuitry. GATED OSCILLATOR CONTROL SCHEME A unique gated oscillator control scheme enables the LMR61428 to have an ultra-low quiescent current and provides a high efficiency over a wide load range. The switching frequency of the internal oscillator is programmable using an external resistor and can be set between 300 kHz and 2 MHz. This control scheme uses a hysteresis window to regulate the output voltage. When the output voltage is below the upper threshold of the window, the LMR61428 switches continuously with a fixed duty cycle of 70% at the switching frequency selected by the user. During the first part of each switching cycle, the internal N-channel MOSFET switch is turned on. This causes the current to ramp up in the inductor and store energy. During the second part of each switching cycle, the MOSFET is turned off. The voltage across the inductor reverses and forces current through the diode to the output filter capacitor and the load. Thus when the LMR61428 switches continuously, the output voltage starts to ramp up. When the output voltage hits the upper threshold of the window, the LMR61428 stops switching completely. This causes the output voltage to droop because the energy stored in the output capacitor is depleted by the load. When the output voltage hits the lower threshold of the hysteresis window, the LMR61428 starts switching continuously again causing the output voltage to ramp up towards the upper threshold. Figure 5 shows the switch voltage and output voltage waveforms. Because of this type of control scheme, the quiescent current is inherently very low. At light loads the gated oscillator control scheme offers a much higher efficiency compared to the conventional PWM control scheme. Figure 5. Typical Step-Up Regulator Waveforms LOW VOLTAGE START-UP The LMR61428 can start-up from input voltages as low as 1.1V. On start-up, the control circuitry switches the Nchannel MOSFET continuously at 70% duty cycle until the output voltage reaches 2.5V. After this output voltage is reached, the normal step-up regulator feedback and gated oscillator control scheme take over. Once the device is in regulation it can operate down to a 0.65V input, since the internal power for the IC can be bootstrapped from the output using the VDD pin. Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated Product Folder Links: LMR61428 7 LMR61428 SNVS815 – JUNE 2012 www.ti.com SHUTDOWN The LMR61428 features a shutdown mode that reduces the quiescent current to less than a guaranteed 2.5µA over temperature. This extends the life of the battery in battery powered applications. During shutdown, all feedback and control circuitry is turned off. The regulator's output voltage drops to one diode drop below the input voltage. Entry into the shutdown mode is controlled by the active-low logic input pin EN (Pin 2). When the logic input to this pin pulled below 0.15VDD, the device goes into shutdown mode. The logic input to this pin should be above 0.7VDD for the device to work in normal step-up mode. OUTPUT VOLTAGE RIPPLE FREQUENCY A major component of the output voltage ripple is due to the hysteresis used in the gated oscillator control scheme. The frequency of this voltage ripple is proportional to the load current. The frequency of this ripple does not necessitate the use of larger inductors and capacitors. The size of these components is determined by the switching frequency of the oscillator which can be set upto 2MHz using an external resistor. INTERNAL CURRENT LIMIT AND THERMAL PROTECTION An internal cycle-by-cycle current limit serves as a protection feature. This is set high enough (2.85A typical, approximately 4A maximum) so as not to come into effect during normal operating conditions. An internal thermal protection circuitry disables the MOSFET power switch when the junction temperature (TJ) exceeds about 160°C. The switch is re-enabled when TJ drops below approximately 135°C. Design Procedure SETTING THE OUTPUT VOLTAGE The output voltage of the step-up regulator can be set between 1.24V and 14V. But because of the gated oscillator scheme, the maximum possible input to output boost ratio is fixed. For a boost regulator, VOUT / VIN = 1 / [1−D] (1) The LMR61428 has a fixed duty cycle, D, of 70% typical. Therefore, VOUT / VIN = 1 / 0.3 (2) This sets the maximum possible boost ratio of VIN to VOUT to about 3 times. The user can now estimate what the minimum design inputs should be in order to achieve a desired output, or what the output would be when a certain minimum input is applied. E.g. If the desired VOUT was 14V, then the least VIN should be higher than VOUT / 3. If the input voltage fell below this threshold, the output voltage would not be regulated because of the fixed duty cycle. If the minimum VIN was guaranteed at 2V, the max possible VOUT would be VIN * 3. The VOUT is set by connecting a feedback resistive divider made of RF1 and RF2. The feedback resistor values are selected as follows: RF2 = RF1 /[(VOUT/ 1.24) −1] (3) A value of 150kΩ is suggested for RF1. Then, RF2 can be selected using the above equation. A 39pF capacitor (Cff) connected across RF1 helps in feeding back most of the AC ripple at VOUT to the FB pin. This helps reduce the peak-to-peak output voltage ripple as well as improve the efficiency of the step-up regulator, because a set hysteresis of 30mV at the FB pin is used for the gated oscillator control scheme. BOOTSTRAPPING When the output voltage (VOUT) is between 2.5V and 5.0V a bootstrapped operation is suggested. This is achieved by connecting the VDD pin (Pin 6) to VOUT. However if the VOUT is outside this range, the VDD pin should be connected to a voltage source whose range is between 2.5V and 5V. This can be the input voltage (VIN), VOUT stepped down using a linear regulator, or a different voltage source available in the system. This is referred to as non-bootstrapped operation. The maximum acceptable voltage at the BOOT pin (Pin 7) is 10V. SETTING THE SWITCHING FREQUENCY The switching frequency of the oscillator is selected by choosing an external resistor (RFQ) connected between FREQ and VDD pins. See the following graph for choosing the RFQ value to achieve the desired switching frequency. A high switching frequency allows the use of very small surface mount inductors and capacitors and results in a very small solution size. A switching frequency between 300kHz and 2MHz is recommended. 8 Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated Product Folder Links: LMR61428 LMR61428 www.ti.com SNVS815 – JUNE 2012 Figure 6. Switching Frequency vs RFQ INDUCTOR SELECTION The LMR61428's high switching frequency enables the use of a small surface mount inductor. A 6.8µH shielded inductor is suggested for a typical application. The inductor should have a saturation current rating higher than the peak current it will experience during circuit operation (see following graph). Less than 100mΩ ESR is suggested for high efficiency. Figure 7. Peak Inductor Current vs Load Current Open-core inductors cause flux linkage with circuit components and interfere with the normal operation of the circuit. They should be avoided. For high efficiency, choose an inductor with a high frequency core material, such as ferrite, to reduce the core losses. To minimize radiated noise, use a toroid, pot core or shielded core inductor. The inductor should be connected to the SW pin as close to the IC as possible. See OUTPUT DIODE SELECTION A Schottky diode should be used for the output diode. The forward current rating of the diode should be higher than the load current, and the reverse voltage rating must be higher than the output voltage. Do not use ordinary rectifier diodes, since slow switching speeds and long recovery times cause the efficiency and the load regulation to suffer. INPUT AND OUTPUT FILTER CAPACITORS SELECTION While tantalum chip capacitors are recommended for the input and output filter capacitors, ceramic caps can also be used. A 22µF capacitor is suggested for the input filter capacitor. It should have a DC working voltage rating higher than the maximum input voltage. A 68µF tantalum capacitor is suggested for the output capacitor. The DC working voltage rating should be greater than the output voltage. Very high ESR values (>3Ω) should be avoided. PC BOARD LAYOUT High switching frequencies and high peak currents make a proper layout of the PC board an important part of design. Poor design can cause excessive EMI and ground-bounce, both of which can cause malfunction and loss of regulation by corrupting voltage feedback signal and injecting noise into the control section. Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated Product Folder Links: LMR61428 9 LMR61428 SNVS815 – JUNE 2012 www.ti.com Power components - such as the inductor, input and output filter capacitors, and output diode - should be placed as close to the regulator IC as possible, and their traces should be kept short, direct and wide. The ground pins of the input and output filter capacitors and the PGND and SGND pins of LMR61428 should be connected using short, direct and wide traces. The voltage feedback network (Rfbt, Rfbb, and Cff) should be kept very close to the FB pin. Noisy traces, such as from the SW pin, should be kept away from the FB and VDD pins. The traces that run between Vout and the FB pin of the IC should be kept away from the inductor flux. Always provide sufficient copper area to dissipate the heat due to power loss in the circuitry and prevent the thermal protection circuitry in the IC from shutting the IC down. Additional ground planes as intermediate levels help with shielding and improve EMI mitigation. Application Examples Figure 8. EXAMPLE 1. 5V/0.5A Step-Up Regulator U1 Texas Instruments LMR61428XMM C1 Vishay/Sprague 595D226X06R3B2T, Tantalum C2 Vishay/Sprague 595D686X0010C2T, Tantalum D1 Motorola MBRS140T3 L Coilcraft DT1608C-682 Figure 9. EXAMPLE 2. 2mm Tall 5V/0.2A Step-Up Regulator for Low Profile Applications 10 Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated Product Folder Links: LMR61428 LMR61428 www.ti.com SNVS815 – JUNE 2012 U1 Texas Instruments LMR61428XMM C1 Vishay/Sprague 592D156X06R3B2T, Tantalum C2 Vishay/Sprague 592D336X06R3C2T, Tantalum D1 Motorola MBRS140T3 L Vishay/Dale ILS-3825-03 Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated Product Folder Links: LMR61428 11 PACKAGE OPTION ADDENDUM www.ti.com 17-Nov-2012 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Pins Package Qty Drawing Eco Plan Lead/Ball Finish (2) MSL Peak Temp Samples (3) (Requires Login) LMR61428XMM/NOPB ACTIVE VSSOP DGK 8 1000 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM LMR61428XMMX/NOPB ACTIVE VSSOP DGK 8 3500 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device. (2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability information and additional product content details. TBD: The Pb-Free/Green conversion plan has not been defined. Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes. Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above. Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material) (3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature. Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. 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Addendum-Page 1 PACKAGE MATERIALS INFORMATION www.ti.com 17-Nov-2012 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant LMR61428XMM/NOPB VSSOP DGK 8 1000 178.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1 LMR61428XMMX/NOPB VSSOP DGK 8 3500 330.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1 Pack Materials-Page 1 PACKAGE MATERIALS INFORMATION www.ti.com 17-Nov-2012 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LMR61428XMM/NOPB VSSOP DGK 8 1000 203.0 190.0 41.0 LMR61428XMMX/NOPB VSSOP DGK 8 3500 349.0 337.0 45.0 Pack Materials-Page 2 IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. 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