LX13045A ® TM 2A Step-Down Synchronous Converter P RODUCTION D ATA S HEET KEY FEATURES DESCRIPTION The output response is fast for dynamic load changes using a high bandwidth error amplifier control loop. Power conversion efficiency is maximized with low RDSON of the MOSFET switches and small regulator quiescent current. The LX13045A features include: OVP monitoring at the feedback pin for +110% threshold detection; PGOOD indicator to externally signal when VOUT is within ±5% of nominal, and Thermal shutdown. The Current limit monitors the Switch pin load on a cycle by cycle basis for rapid protection during fault conditions. The 6 pin MO-229 package provides a small form factor with excellent power dissipation capability. IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com Input Range Voltage 4.5V to 6V Maximum Output Current, 2A Output Voltage from 0.8V to 90% of VIN PWM Fixed Frequency Power On Soft Start Efficiency up to 95% No External Schottky Diode Power Good Indicator Thermal Shutdown Cycle by Cycle Switch Current Limit UVLO OVP Short Circuit Protection 6 pin MLP, JEDEC MO-229 WWW . Microsemi .C OM The LX13045A operates as a Current Mode, Synchronous 1.3MHz PWM Buck regulator with an adjustable output voltage. It provides up to 2 amps of DC current with no minimum load requirement. Few external components are necessary since the MOSFET switches and compensation components are internal to the IC. The LX13045A operational supply voltage range covers 4.5V to 6V. During start-up an internal UVLO keeps the output off until VIN reaches 3.7V, VOUT is then ramped in the soft start mode to limit the supply inrush current. Tight output voltage regulation is achieved with the 800mv, ±2% reference to program VOUT from 800mV to 90% of VIN. APPLICATIONS Lower Power Embedded Applications WLAN Power System Portable Design with Single Cell Li-Ion or 3 Cell NiMH/NiCd Portable Storage Applications PRODUCT HIGHLIGHT LX13045A VIN 50K 2.7µH 10µF PGOOD VCC VO SW VPWR Part PGOOD HSGND 40µF FB PGND PACKAGE ORDER INFO LD Plastic MO-229 6 pin LX13045A TA (°C) RoHS Compliant / Pb-free 0 to 85 LX13045ACLD Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX13045ACLD-TR) Copyright © 2007 Rev. 1.3, 2007-04-24 Microsemi Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 1 LX13045A ® TM 2A Step-Down Synchronous Converter P RODUCTION D ATA S HEET ABSOLUTE MAXIMUM RATINGS PACKAGE PIN OUT 1 6 FB PGND 3 PGOOD 045A xxxx MSC 2 SW 5 VCC 4 VPWR LD PACKAGE (Top View) Note: Exceeding these ratings could cause damage to the device. All voltages are with respect to Ground. Currents are positive into, negative out of specified terminal. LD PART MARKING “xxxx” Denote Date Code and Lot Identification WWW . Microsemi .C OM Supply Input Voltage (PWR, VCC).................................................................. -0.3V to 7V Input Voltage (FB, PGOOD) .......................................................... -0.3V to (VCC + 0.3V) Maximum Switch Voltage (SW)..................................................... -0.3V to (VPWR + 0.3V) SW Peak Current .....................................................................................Internally Limited Operating Junction Temperature Range.......................................................... 0°C to 125°C Maximum Operating Junction Temperature .............................................................. 150°C Storage Temperature Range.........................................................................-65°C to 150°C Package Peak Temp. for Solder Reflow (40 seconds maximum exposure) ... 260°C (+0 -5) RoHS / Pb-free 100% Matte Tin Pin Finish THERMAL DATA LD Plastic MLP 6-Pin THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA 35 – 50°C/W Junction Temperature Calculation: TJ = TA + (PD x θJA). The θJA numbers are guidelines for the thermal performance of the device/pc-board system. All of the above assume no ambient airflow. FUNCTIONAL PIN DESCRIPTION Pin Name 1 FB Feedback Pin. This pin is regulated to the internal reference voltage. Description 2 PGND Ground. High current ground; connect to common ground reference. 3 SW 4 VPWR 5 VCC 6 PGOOD Heatsink AGND MOSFET Switch. Connects to inductor. Power Input. Connect to voltage source with low impedance. Reference Power Supply for IC control circuitry. Open drain pulls low when VFB exceeds ±5% of nominal. Analog Ground. Low current signal ground reference for IC; also attaches to bottom pad. Connect to common ground reference. RECOMMENDED OPERATING CONDITIONS Parameter Symbol Copyright © 2007 Rev. 1.3, 2007-04-24 VIN IOUT TJ TA LX13045A Typ Microsemi Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Max 5.5 2.0 90% of VIN 125 85 Units V A V °C °C LX13045A Input Operating Voltage Range Continuous Output Current Range Output Voltage Range Operating Junction Temperature Operating Ambient Temperature Min 4.5 0 0.8 0 0 Page 2 LX13045A ® TM 2A Step-Down Synchronous Converter P RODUCTION D ATA S HEET ELECTRICAL CHARACTERISTICS Parameter ` Symbol Test Conditions Min LX13045A Typ Max Units ENTIRE REGULATOR Input Voltage Under Voltage Lockout UVLO Quiescent Current VPWR, VCC 4.5 5.5 VUVLO VCC and VPWR Rising 3.7 3.9 Hysteresis 150 ICC ILOAD = 0mA Switching 34 4.5V < (VCC, VPWR) < 5.5V, Feedback Voltage VFBnom 784 800 816 10mA < IOUT < 2A FB Input Current IFB 0.75V < VFB < 0.85V -50 50 Internal Oscillator Frequency FOSC 1.0 1.3 1.6 OVP Threshold (PGOOD VFB ramps up from VFB nominal operating 104% of VFB OVPpoint VFB nom Output High) 110% VFB ramp up from nominal operating point. of VFB OVP Threshold (Fault Detected) VFB OVP+ Verify: Switch pin sinking current and PGOOD output low nom OVP Hysteresis 50 91% of 94% of PGOOD, Output High VFB TH+ Ramp up VFB, starting at VFB ≤ 700mV VFB nom VFB nom 88% of PGOOD, Output Low VFB THRamp down VFB, starting at VFB = VFB nom VFB nom PGOOD Indicator (Fault PGOOD Activated, ISINK = 6mA, 400 VOL VFB = 700mV Detected) High Side Switch PRDSON 200 Low Side Switch NRDSON 175 SW Pin Current Limit 2.5 2.9 4.2 Reverse Leakage Current into VCC > 3.6V and VPWR Open VSW = 5.5V 1 SW V V mV mA mV WWW . Microsemi .C OM The following specifications apply over the operating ambient temperature 0°C ≤ TA ≤ 85°C and junction temperature 0°C < TJ < 125°C except where otherwise noted and with the following test conditions: VCC = 5V, VPWR = 5V, VOUT = 1.2V. Typical values are for TA = TJ = 25°C nA MHz % % mV % % mV mΩ mΩ A µA SYSTEM CHARACTERISTICS The following specifications apply over the operating ambient temperature 0°C ≤ TA ≤ 85°C and junction temperature 0°C < TJ < 125°C except where otherwise noted and with the following test conditions: VCC = 5V, VPWR = 5V, VOUT = 1.2V. Typical values are for TA = TJ = 25°C. These parameters are assured by design and are tested on an evaluation platform with typical components. These parameters are not guaranteed by production testing. Symbol Efficiency Line Regulation Load Regulation Transient Response Load Current Step Thermal Shutdown Threshold Thermal Shutdown Hysteresis η Copyright © 2007 Rev. 1.3, 2007-04-24 ∆VOUT Test Conditions VOUT = 1.2V, IOUT = 750mA VIN = 4.5V to 5.5V, IO = 100mA IOUT = 10mA to 2.0A IOUT Steps from 100mA to 1A, Rise Time < 1µs LX13045A Typ Max 80 0.1 -1.0 0.1 0.75 Min -5 130 Microsemi Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 5 150 5 Units % % % %/ VOUT °C °C Page 3 LX13045A Parameter LX13045A ® TM 2A Step-Down Synchronous Converter P RODUCTION D ATA S HEET PACKAGE DIMENSIONS MO-229 6-Pin Plastic 3 x 3 x .9 mm D L1 D2 Pin 1 ID E E2 L b A1 e A K Dim A A1 K e L b D2 E2 D E L1 MILLIMETERS MIN MAX 0.80 1.00 0.00 0.05 0.20 MIN 0.95 BSC 0.30 0.50 0.30 0.45 1.90 2.40 1.15 1.65 3.00 BSC 3.00 BSC 0.00 0.15 INCHES MIN MAX 0.031 0.039 0.000 0.002 0.008 MIN 0.037 BSC 0.012 0.020 0.012 0.018 0.075 0.094 0.045 0.065 0.118 BSC 0.118 BSC 0.000 0.006 WWW . Microsemi .C OM LD Note: 1. Dimensions do not include mold flash or protrusions; these shall not exceed 0.155mm(.006”) on any side. Lead dimension shall not include solder coverage. LX13045A Copyright © 2007 Rev. 1.3, 2007-04-24 Microsemi Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 4 LX13045A TM ® 2A Step-Down Synchronous Converter P RODUCTION D ATA S HEET NOTES WWW . Microsemi .C OM LX13045A PRODUCTION DATA – Information contained in this document is proprietary to Microsemi and is current as of publication date. This document may not be modified in any way without the express written consent of Microsemi. Product processing does not necessarily include testing of all parameters. Microsemi reserves the right to change the configuration and performance of the product and to discontinue product at any time. Copyright © 2007 Rev. 1.3, 2007-04-24 Microsemi Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 5