Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsPMICsPMIC - DC/DC voltage regulator Holder WSON 10

VIN

BST

LM25010

VCC

RON/SD

6V - 42V

Input

OUT

RTN

ISEN

SGND

SHUTDOWN

LM25010

www.ti.com

SNVS419D –DECEMBER 2005–REVISED FEBRUARY 2013

LM25010/LM25010Q 42V, 1.0A Step-Down Switching Regulator

Check for Samples: LM25010

FEATURES

PACKAGE

• Wide 6V to 42V Input Voltage Range

• WSON-10 (4 mm x 4 mm)

• Valley Current Limiting At 1.25A • HTSSOP-14EP

• Programmable Switching Frequency Up To 1 • Both packages have exposed thermal pad for

MHz improved heat dissipation

• Integrated N-Channel Buck Switch

DESCRIPTION

• Integrated High Voltage Bias Regulator

The LM25010 features all the functions needed to

• No Loop Compensation Required

implement a low cost, efficient, buck regulator

• Ultra-Fast Transient Response

capable of supplying in excess of 1A load current.

This high voltage regulator integrates an N-Channel

• Nearly Constant Operating Frequency With

Buck Switch, and is available in thermally enhanced

Line and Load Variations

WSON-10 and HTSSOP-14EP packages. The

• Adjustable Output Voltage

constant on-time regulation scheme requires no loop

• 2.5V, ±2% Feedback Reference

compensation resulting in fast load transient

response and simplified circuit implementation. The

• Programmable Soft-Start

operating frequency remains constant with line and

• Thermal shutdown

load variations due to the inverse relationship

• LM25010Q is AEC-Q100 Grade 1 & 0 qualified

between the input voltage and the on-time. The valley

current limit detection is set at 1.25A. Additional

TYPICAL APPLICATIONS

features include: VCC under-voltage lock-out, thermal

shutdown, gate drive under-voltage lock-out, and

• Non-Isolated Telecommunications Regulator

maximum duty cycle limiter.

• Secondary Side Post Regulator

• Automotive Electronics

BASIC STEP-DOWN REGULATOR

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.

2All 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.

Summary of content (28 pages)

PAGE 1
LM25010 www.ti.com SNVS419D – DECEMBER 2005 – REVISED FEBRUARY 2013 LM25010/LM25010Q 42V, 1.0A Step-Down Switching Regulator Check for Samples: LM25010 FEATURES PACKAGE • • • • • • 1 2 • • • • • • • • • • Wide 6V to 42V Input Voltage Range Valley Current Limiting At 1.
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LM25010 SNVS419D – DECEMBER 2005 – REVISED FEBRUARY 2013 www.ti.com Connection Diagram 1 2 3 4 5 SW VIN BST VCC ISEN RON/SD SGND SS RTN FB 10 1 9 2 8 3 7 4 6 5 6 7 14 NC NC SW VIN BST VCC ISEN RON/SD SGND SS RTN FB NC NC 13 12 11 10 9 8 Pin Descriptions PIN NUMBER NAME DESCRIPTION APPLICATION INFORMATION WSON-10 HTSSOP-14 1 2 SW Switching node Internally connected to the buck switch source. Connect to the inductor, free-wheeling diode, and bootstrap capacitor.
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LM25010 www.ti.com SNVS419D – DECEMBER 2005 – REVISED FEBRUARY 2013 Absolute Maximum Ratings (1) VIN to RTN –0.3V to 45V BST to RTN –0.3V to 59V SW to RTN (steady state) –1.5V BST to VCC 45V BST to SW 14V VCC to RTN –0.3V to 14V SGND to RTN –0.3V to 0.3V SS to RTN –0.3V to 4V VIN to SW 45V All other inputs to RTN ESD Rating –0.
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LM25010 SNVS419D – DECEMBER 2005 – REVISED FEBRUARY 2013 www.ti.com Electrical Characteristics Specifications with standard type are for TJ = 25°C only; limits in boldface type apply over the full operating junction temperature (TJ) range. Minimum and maximum limits are guaranteed through test, design, or statistical correlation. Typical values represent the most likely parametric norm at TJ = 25°C, and are provided for reference purposes only.
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LM25010 www.ti.com SNVS419D – DECEMBER 2005 – REVISED FEBRUARY 2013 Electrical Characteristics (continued) Specifications with standard type are for TJ = 25°C only; limits in boldface type apply over the full operating junction temperature (TJ) range. Minimum and maximum limits are guaranteed through test, design, or statistical correlation. Typical values represent the most likely parametric norm at TJ = 25°C, and are provided for reference purposes only.
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LM25010 SNVS419D – DECEMBER 2005 – REVISED FEBRUARY 2013 www.ti.com Typical Performance Characteristics VCC vs VIN VCC vs ICC 10 8 VIN = 8V 7 8.0 VCC (V) VCC (V) VIN = 6V 5 6.0 4.0 VIN = 24V VIN = 9V 6 4 VCC UVLO 3 2 ICC = 0 mA 2.0 VCC Externally Loaded 1 0 FS = 400 kHz 0 0 1 2 3 4 5 6 7 8 9 10 0 3 6 VIN (V) Figure 2. ICC vs Externally Applied VCC On-Time vs VIN and RON 15 100 9 FS = 700 kHz 8 7 ON-TIME (Ps) ICC INPUT CURRENT(mA) 12 Figure 1.
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LM25010 www.ti.com SNVS419D – DECEMBER 2005 – REVISED FEBRUARY 2013 Block Diagram Input 6V-42V LM25010 7V BIAS REGULATOR VIN VIN SENSE C1 C5 VCC UVL BYPASS SWITCH Q2 VCC THERMAL SHUTDOWN C3 BST Gate Drive UVLO GND RON 260 ns OFF TIMER START ON TIMER 0.7V START RON COMPLETE RON/SD SD VIN C4 Q1 LEVEL SHIFT COMPLETE L1 DRIVER SW Shutdown Input D1 CURRENT LIMIT COMPARATOR Driver 2.5V 62.5 mV 11.5 PA SS RCL RSENSE (optional) 50 m: + SGND R1 2.
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LM25010 SNVS419D – DECEMBER 2005 – REVISED FEBRUARY 2013 www.ti.com Functional Description The LM25010 Step-Down Switching Regulator features all the functions needed to implement a low cost, efficient buck DC-DC converter capable of supplying in excess of 1A to the load. This high voltage regulator integrates an N-Channel buck switch, with an easy to implement constant on-time controller. It is available in the thermally enhanced WSON-10 and HTSSOP-14EP packages.
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LM25010 www.ti.com SNVS419D – DECEMBER 2005 – REVISED FEBRUARY 2013 When VIN exceeds the bypass threshold, the time required for Q2 to shut off is approximately 2 to 3 µs. The capacitor at VCC (C3) must be a minimum of 0.47 µF to prevent the voltage at VCC from rising above its absolute maximum rating in response to a step input applied at VIN. C3 must be located as close as possible to the LM25010 pins.
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LM25010 SNVS419D – DECEMBER 2005 – REVISED FEBRUARY 2013 RON = VOUT x (VIN - 1.4V) VIN x FS x 1.18 x 10 -10 www.ti.com - 1.4 k: (7) In high frequency applications the minimum value for tON is limited by the maximum duty cycle required for regulation and the minimum off-time of the LM25010 (260 ns, ±15%). The fixed off-time limits the maximum duty cycle achievable with a low voltage at VIN.
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LM25010 www.ti.com SNVS419D – DECEMBER 2005 – REVISED FEBRUARY 2013 IPK IOCL Inductor Current Current Limit Threshold Io 'I High Load Current Low Load Current Current Limited Normal Operation Figure 10. Inductor Current - Current Limit Operation N-Channel Buck Switch and Driver The LM25010 integrates an N-Channel buck switch and associated floating high voltage gate driver. The peak current through the buck switch should not exceed 2A, and the load current should not exceed 1.5A.
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LM25010 SNVS419D – DECEMBER 2005 – REVISED FEBRUARY 2013 www.ti.com APPLICATIONS INFORMATION External Components The procedure for calculating the external components is illustrated with a design example. Referring to the Block Diagram, the circuit is to be configured for the following specifications: • VOUT = 5V • VIN = 6V to 40V • FS = 175 kHz • Minimum load current = 200 mA • Maximum load current = 1.0A • Softstart time = 5 ms.
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LM25010 www.ti.com SNVS419D – DECEMBER 2005 – REVISED FEBRUARY 2013 This provides a minimum value for L1 - the next higher standard value (100 µH) will be used. To prevent saturation, and possible destructive current levels, L1 must be rated for the peak current which occurs if the current limit and maximum ripple current are reached simultaneously (IPK in Figure 10).
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LM25010 SNVS419D – DECEMBER 2005 – REVISED FEBRUARY 2013 www.ti.com C3: The capacitor at the VCC pin provides noise filtering and stability, prevents false triggering of the VCC UVLO at the buck switch on/off transitions, and limits the peak voltage at VCC when a high voltage with a short rise time is initially applied at VIN. C3 should be no smaller than 0.47 µF, and should be a good quality, low ESR, ceramic capacitor, physically close to the IC pins. C4: The recommended value for C4 is 0.022 µF.
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LM25010 www.ti.com SNVS419D – DECEMBER 2005 – REVISED FEBRUARY 2013 ITEM DESCRIPTION VALUE C5 Ceramic Capacitor 0.1 µF, 50V D1 Schottky Diode 60V, 2A L1 Inductor 100 µH R1 Resistor 1.0 kΩ R2 Resistor 1.0 kΩ R3 Resistor 1.5 Ω RON Resistor 200 kΩ U1 LM25010 100 VIN = 6V EFFICIENCY (%) 90 40V 80 12V 70 60 50 200 400 600 800 1000 LOAD CURRENT (mA) Figure 13.
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LM25010 SNVS419D – DECEMBER 2005 – REVISED FEBRUARY 2013 www.ti.com L1 SW LM25010 R1 R3 R2 C2 FB VOUT Figure 15. Low Ripple Output Where the circuit of Figure 15 is not suitable, the circuits of Figure 16 or Figure 17 can be used. SW L1 VOUT LM25010 Cff R1 FB R2 R3 C2 Figure 16. Low Output Ripple Using a Feedforward Capacitor In Figure 16, Cff is added across R1 to AC-couple the ripple at VOUT directly to the FB pin.
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LM25010 www.ti.com SNVS419D – DECEMBER 2005 – REVISED FEBRUARY 2013 To reduce VOUT ripple further, the circuit of Figure 17 can be used. R3 has been removed, and the output ripple amplitude is determined by C2’s ESR and the inductor ripple current. RA and CA are chosen to generate a 40 to 50 mVP-P sawtooth at their junction, and that voltage is AC-coupled to the FB pin via CB. In selecting RA and CA, VOUT is considered a virtual ground as the SW pin switches between VIN and –1V.
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LM25010 SNVS419D – DECEMBER 2005 – REVISED FEBRUARY 2013 www.ti.com possible. The exposed pad is internally connected to the IC substrate. The use of wide PC board traces at the pins, where possible, can help conduct heat away from the IC. The four NC pins on the HTSSOP package are not electrically connected to any part of the IC, and may be connected to ground plane to help dissipate heat from the package.
PAGE 19
LM25010 www.ti.com SNVS419D – DECEMBER 2005 – REVISED FEBRUARY 2013 REVISION HISTORY Changes from Revision C (February 2013) to Revision D • Page Changed layout of National Data Sheet to TI format ..........................................................................................................
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 14-Feb-2014 (3) MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature. (4) There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device. (5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device.
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PACKAGE MATERIALS INFORMATION www.ti.com 11-Oct-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ HTSSOP PWP 14 2500 330.0 12.4 LM25010Q0MHX/NOPB HTSSOP PWP 14 2500 330.0 LM25010Q1MHX/NOPB HTSSOP PWP 14 2500 330.0 LM25010MHX/NOPB Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant 6.95 8.3 1.6 8.0 12.0 Q1 12.4 6.95 8.3 1.6 8.0 12.0 Q1 12.4 6.95 8.3 1.6 8.0 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 11-Oct-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LM25010MHX/NOPB HTSSOP PWP 14 2500 367.0 367.0 35.0 LM25010Q0MHX/NOPB HTSSOP PWP 14 2500 367.0 367.0 35.0 LM25010Q1MHX/NOPB HTSSOP PWP 14 2500 367.0 367.0 35.0 LM25010SD/NOPB WSON DPR 10 1000 210.0 185.0 35.0 LM25010SDX/NOPB WSON DPR 10 4500 367.0 367.0 35.
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MECHANICAL DATA PWP0014A MXA14A (Rev A) www.ti.
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MECHANICAL DATA DPR0010A SDC10A (Rev A) www.ti.
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