Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsPMICsPMIC - DC/DC voltage regulator Holder VSSOP 8

LM25007

www.ti.com

SNVS401C –JANUARY 2006–REVISED FEBRUARY 2013

LM25007 42V, 0.5A Step-Down Switching Regulator

Check for Samples: LM25007

FEATURES

DESCRIPTION

The LM25007 is a monolithic step-down switching

• Integrated 0.74Ω N-Channel MOSFET Switch

regulator featuring all of the functions needed to

• Guaranteed 0.5A Output Current

implement a low cost, efficient, power supply.

• Ultra-Fast Transient Response

Capable of driving a 0.5A load over a 9V-42V input

voltage range, this device is easy to apply and is

• Up to 800kHz Operation

provided in the small VSSOP-8 and the thermally

• No Control Loop Compensation Required

enhanced WSON-8 packages. Ultra-fast transient

• Vin Feed Forward Provides Constant

response is achieved through the use of a constant

Operating Frequency

on-time architecture with Vin feed forward. This

feature provides an almost constant operating

• 2% Accurate 2.5V Feedback from -40°C to

frequency over load and input voltage variations. The

125°C

operating frequency can be adjusted with a single

• Highly Efficient Operation

resistor. This architecture is easy to use and tolerant

• Intelligent Current Limit Protection

of component selection. An intelligent current limit is

implemented in the LM25007 with forced off time that

• External Shutdown Control

is inversely proportional to Vout thus ensuring

• Thermal Shutdown

recovery from fault conditions. The output voltage

• VSSOP and Thermally Enhanced WSON

may be set from 2.5V to >30V. To improve efficiency

Packages

in light load applications, the Vcc pin can be

connected to an external voltage source to eliminate

the drop through the internal regulator. Additional

TYPICAL APPLICATIONS

features include: thermal shutdown, Vcc under-

• 12VDC and 24VDC Distributed Rail Systems

voltage lockout, gate drive under-voltage lockout, and

• 24VAC Systems

max duty cycle limiter.

• Automotive Body Electronics and Telematics

• Industrial Systems

• HB-LED Constant Current Source

• Package:

– VSSOP-8

– WSON-8 (4mm x 4mm)

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 (19 pages)

PAGE 1
LM25007 www.ti.com SNVS401C – JANUARY 2006 – REVISED FEBRUARY 2013 LM25007 42V, 0.5A Step-Down Switching Regulator Check for Samples: LM25007 FEATURES DESCRIPTION • • • • • • The LM25007 is a monolithic step-down switching regulator featuring all of the functions needed to implement a low cost, efficient, power supply. Capable of driving a 0.5A load over a 9V-42V input voltage range, this device is easy to apply and is provided in the small VSSOP-8 and the thermally enhanced WSON-8 packages.
PAGE 2
LM25007 SNVS401C – JANUARY 2006 – REVISED FEBRUARY 2013 www.ti.
PAGE 3
LM25007 www.ti.com SNVS401C – JANUARY 2006 – REVISED FEBRUARY 2013 Pin Descriptions Pin Name Description Application Information 1 SW Switching Node Power switching node. Connect to the inductor, bootstrap capacitor, and free-wheeling diode. 2 BST Boost Boot–strap capacitor input An external capacitor is required between the BST and the SW pins. A 0.01µF ceramic capacitor is recommended.
PAGE 4
LM25007 SNVS401C – JANUARY 2006 – REVISED FEBRUARY 2013 www.ti.com 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) VIN to RTN 45V BST to RTN 59V SW to RTN (Steady State) ESD Rating, Human Body Model -1V (2) 2kV BST to VCC 45V BST to SW 14V VCC to RTN 14V All Other Inputs to RTN -0.
PAGE 5
LM25007 www.ti.com SNVS401C – JANUARY 2006 – REVISED FEBRUARY 2013 Electrical Characteristics (1) 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.
PAGE 6
LM25007 SNVS401C – JANUARY 2006 – REVISED FEBRUARY 2013 www.ti.com Typical Performance Characteristics Operational Waveforms Operational Waveforms LM25007 Operation: VOUT = 10V, VIN = 20V, IOUT = 250mA CH1: Switch Node, CH2: VOUT (AC), CH4: Inductor Current LM25007 Operation: VOUT = 10V, VIN = 42V, IOUT = 250mA CH1: Switch Node, CH2: VOUT (AC), CH4: Inductor Current Figure 2. Figure 1.
PAGE 7
LM25007 www.ti.com SNVS401C – JANUARY 2006 – REVISED FEBRUARY 2013 DETAILED OPERATING DESCRIPTION The LM25007 is a monolithic step-down switching regulator featuring all of the functions needed to implement low cost, efficient, power supply. Capable of driving a 0.5Amp load over a 9-42V input voltage range, this device is easy to apply and is provided in the small VSSOP-8 and the thermally enhanced WSON-8 packages.
PAGE 8
LM25007 SNVS401C – JANUARY 2006 – REVISED FEBRUARY 2013 www.ti.com For applications where lower output voltage ripple is required the load can be connected directly to the low ESR output capacitor, as shown in Figure 6. The series resistor (R5) will degrade the load regulation. Another technique for enhancing the ripple voltage at the FB pin is to place a capacitor in parallel with the feedback divider resistor R3.
PAGE 9
LM25007 www.ti.com SNVS401C – JANUARY 2006 – REVISED FEBRUARY 2013 7V SERIES REGULATOR VCC + 0.1 PF SELF-BIAS DIODE BST VIN + 0.01 PF SW 10V LM25007 30k + 10k Figure 7. Self Biased Configuration Over-Voltage Comparator The over-voltage comparator is provided to protect the output from overvoltage conditions due to sudden input line voltage changes or output loading changes. The over-voltage comparator monitors the FB pin versus an internal 2.875V reference. If the voltage at FB rises above 2.
PAGE 10
LM25007 SNVS401C – JANUARY 2006 – REVISED FEBRUARY 2013 www.ti.com 7V SERIES REGULATOR VIN VIN ON TIMER RON VIN START RON/SD RON COMPLETE STOP RUN LM25007 Figure 8. Shutdown Implementation Current Limit The LM25007 contains an intelligent current limit off-timer intended to reduce the foldback characteristic inherent with fixed off-time over-current protection. If the current in the Buck switch exceeds 725mA the present cycle ontime is immediately terminated (cycle by cycle current limit).
PAGE 11
LM25007 www.ti.com SNVS401C – JANUARY 2006 – REVISED FEBRUARY 2013 Thermal Protection Internal Thermal Shutdown circuitry is provided to protect the integrated circuit in the event the maximum junction temperature is exceeded. When thermal protection is activated, typically at 165 degrees Celsius, the controller is forced into a low power reset state, disabling the output driver. This feature is provided to prevent catastrophic failures from accidental device overheating.
PAGE 12
LM25007 SNVS401C – JANUARY 2006 – REVISED FEBRUARY 2013 www.ti.com REVISION HISTORY Changes from Revision B (February 2013) to Revision C • 12 Page Changed layout of National Data Sheet to TI format ..........................................................................................................
PAGE 13
PACKAGE OPTION ADDENDUM www.ti.
PAGE 14
PACKAGE OPTION ADDENDUM www.ti.com 14-Feb-2014 Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties.
PAGE 15
PACKAGE MATERIALS INFORMATION www.ti.com 23-Sep-2013 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 LM25007SD/NOPB WSON NGT 8 1000 178.0 12.4 4.3 4.3 1.3 8.0 12.0 Q1 LM25007SDX/NOPB WSON NGT 8 4500 330.0 12.4 4.3 4.3 1.3 8.0 12.
PAGE 16
PACKAGE MATERIALS INFORMATION www.ti.com 23-Sep-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LM25007SD/NOPB WSON NGT 8 1000 210.0 185.0 35.0 LM25007SDX/NOPB WSON NGT 8 4500 367.0 367.0 35.
PAGE 17
PAGE 18
MECHANICAL DATA NGT0008A SDC08A (Rev A) www.ti.
PAGE 19
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. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.