Datasheet

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OUT

RON/SD

VIN

RTN

BST

SHUTDOWN

RCL

VCC

9.5 - 95V

Input

LM5009

www.ti.com

SNVS402G –FEBRUARY 2006–REVISED FEBRUARY 2013

150-mA 100-V Step-Down Switching Regulator

Check for Samples: LM5009

FEATURES

DESCRIPTION

The LM5009 Step Down Switching Regulator features

• Integrated N-Channel MOSFET

all of the functions needed to implement a low cost,

• 150-mA output current capability

efficient, Buck bias regulator. This device is capable

• Ultra-Fast Transient Response

of driving a 150 mA load current from a 9.5V to 95V

input source. The switching frequency can exceed

• No loop compensation required

600 kHz, depending on the input and output voltages.

• Vin feed forward provides constant operating

The output voltage may be set from 2.5V to 85V. This

frequency

high voltage regulator contains an N-Channel buck

• Switching frequency can exceed 600 kHz

switch and internal startup regulator. The device is

easy to implement and is provided in the 8-pin

• Highly efficient operation

VSSOP and the thermally enhanced 8-pin WSON

• 2% accurate 2.5V feedback from -40°C to

packages. The LM5009 is a well suited alternative to

125°C

a high voltage monolithic or discrete linear solution

• Internal startup regulator

where the power loss becomes unacceptable. The

regulator’s operation is based on a control scheme

• Intelligent current limit protection

using an ON time inversely proportional to VIN. This

• External shutdown control

feature allows the operating frequency to remain

• Thermal shutdown

relatively constant over load and input voltage

variations. The control scheme requires no loop

• 8-Pin VSSOP and thermally enhanced 8-Pin

compensation, resulting in an ultra-fast transient

WSON packages

response. An intelligent current limit is implemented

with forced OFF time, which is inversely proportional

APPLICATIONS

to Vout. This scheme ensures short circuit protection

• Heat sink eliminator for classic linear regulator

while providing minimum foldback. Other features

applications

include: Thermal Shutdown, Vcc under-voltage

lockout, Gate drive under-voltage lockout, and

• 12V, 24V, 36V, and 48V rectified AC systems

Maximum Duty Cycle limiter.

• 42V Automotive

• Non-isolated AC mains charge coupled

supplies

• LED Current Source

Typical Application Circuit

Figure 1. 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 (22 pages)

PAGE 1
LM5009 www.ti.com SNVS402G – FEBRUARY 2006 – REVISED FEBRUARY 2013 150-mA 100-V Step-Down Switching Regulator Check for Samples: LM5009 FEATURES DESCRIPTION • • • • • The LM5009 Step Down Switching Regulator features all of the functions needed to implement a low cost, efficient, Buck bias regulator. This device is capable of driving a 150 mA load current from a 9.5V to 95V input source. The switching frequency can exceed 600 kHz, depending on the input and output voltages.
PAGE 2
LM5009 SNVS402G – FEBRUARY 2006 – REVISED FEBRUARY 2013 www.ti.com Connection Diagram 1 8 SW VIN BST VCC RCL RON/SD RTN FB 2 3 7 6 4 5 Figure 2. 8-Lead VSSOP or WSON Pin Functions Table 1. Pin Descriptions Pin Name Description Application Information 1 SW Switching output Power switching output. Connect to the inductor, re-circulating diode, and bootstrap capacitor. 2 BST Boost Pin An external capacitor is required between the BST and the SW pins. A 0.
PAGE 3
LM5009 www.ti.com SNVS402G – FEBRUARY 2006 – REVISED FEBRUARY 2013 Operating Ratings (1) VIN 9.5V to 95V −40°C to + 125°C Operating Junction Temperature (1) Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which operation of the device is intended to be functional. For specifications and test conditions, see the Electrical Characteristics.
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LM5009 SNVS402G – FEBRUARY 2006 – REVISED FEBRUARY 2013 www.ti.com Electrical Characteristics Limits in standard type are for TJ = 25°C only, and limits in boldface type apply over the junction temperature (TJ) range of ‑40°C to +125°C. Minimum and Maximum limits are specified 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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LM5009 www.ti.com SNVS402G – FEBRUARY 2006 – REVISED FEBRUARY 2013 Typical Performance Characteristics On-Time vs \ VIN and RON VCC vs VIN and FS 10 7.1 FS = 180 kHz 6.9 Ron = 500k VCC (V) ON-TIME (Ps) 7.0 1.0 400 kHz 6.8 725 kHz 300k 1.2 MHz 6.7 100k 6.6 0.1 20 40 60 80 6.5 9.0 100 9.5 10.0 VIN (V) Figure 3. Figure 4. Current Limit Off-Time vs VFB and RCL VCC vs ICC and VIN 35 8 30 7 VIN t 15V VIN = 9.5V 6 25 RCL = 500k 10V 5 20 15 11.0 10.
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LM5009 SNVS402G – FEBRUARY 2006 – REVISED FEBRUARY 2013 www.ti.com TYPICAL APPLICATION CIRCUIT AND BLOCK DIAGRAM 7V SERIES REGULATOR 9.5V - 95V Input LM5009 VCC 8 VIN C1 SD C5 C3 THERMAL SHUTDOWN UVLO ON TIMER START RON COMPLETE 6 SD/ RON BST Ron OVER-VOLTAGE COMPARATOR SHUTDOWN + - 2.
PAGE 7
LM5009 www.ti.com SNVS402G – FEBRUARY 2006 – REVISED FEBRUARY 2013 FUNCTIONAL DESCRIPTION The LM5009 Step Down Switching Regulator features all the functions needed to implement a low cost, efficient, Buck bias power converter. This high voltage regulator contains a 100 V N-Channel Buck Switch, is easy to implement and is provided in the VSSOP-8 and the thermally enhanced WSON-8 packages. The regulator is based on a control scheme using an on-time inversely proportional to VIN.
PAGE 8
LM5009 SNVS402G – FEBRUARY 2006 – REVISED FEBRUARY 2013 www.ti.com L1 SW LM5009 R1 R3 FB VOUT2 R2 C2 Figure 9. Low Ripple Output Configuration High Voltage Start-Up Regulator The LM5009 contains an internal high voltage startup regulator. The input pin (VIN) can be connected directly to line voltages up to 95 Volts, with transient capability to 100 volts. The regulator is internally current limited at 9.5mA. Upon power up, the regulator sources current into the external capacitor at VCC (C3).
PAGE 9
LM5009 www.ti.com SNVS402G – FEBRUARY 2006 – REVISED FEBRUARY 2013 Over-Voltage Comparator The feedback voltage at FB is compared to an internal 2.875V reference. If the voltage at FB rises above 2.875V the on-time pulse is immediately terminated. This condition can occur if the input voltage, or the output load, change suddenly. The buck switch will not turn on again until the voltage at FB falls below 2.5V.
PAGE 10
LM5009 SNVS402G – FEBRUARY 2006 – REVISED FEBRUARY 2013 www.ti.com An external re-circulating diode (D1) carries the inductor current after the internal buck switch turns off. This diode should be of the ultra-fast or Schottky type to minimize turn-on losses and current over-shoot. Thermal Protection The LM5009 should be operated so the junction temperature does not exceed 125°C during normal operation.
PAGE 11
LM5009 www.ti.com SNVS402G – FEBRUARY 2006 – REVISED FEBRUARY 2013 APPLICATIONS INFORMATION SELECTION OF EXTERNAL COMPONENTS A guide for determining the component values will be illustrated with a design example. Refer to Figure 8. The following steps will configure the LM5009 for: • Input voltage range (Vin): 12V to 90V • Output voltage (VOUT1): 10V • Load current (for continuous conduction mode): 100mA to 150mA R1 and R2: From Figure 8, VOUT1 = VFB x (R1 + R2) / R2, and since VFB = 2.
PAGE 12
LM5009 SNVS402G – FEBRUARY 2006 – REVISED FEBRUARY 2013 www.ti.com C2 should generally be no smaller than 3.3 µF. Typically, its value is 10 µF to 20 µF, with the optimum value determined by the load. If the load current is fairly constant, a small value suffices for C2. If the load current includes significant transients, a larger value is necessary. For each application, experimentation is needed to determine the optimum values for R3 and C2.
PAGE 13
LM5009 www.ti.com SNVS402G – FEBRUARY 2006 – REVISED FEBRUARY 2013 FINAL CIRCUIT The final circuit is shown in Figure 12. The circuit was tested, and the resulting performance is shown in Figure 13 through Figure 16. For these graphs, the load current was varied from 50mA to 200mA. MINIMUM LOAD CURRENT A minimum load current of 1 mA is required to maintain proper operation.
PAGE 14
LM5009 SNVS402G – FEBRUARY 2006 – REVISED FEBRUARY 2013 www.ti.com Table 2. Bill of Materials (Circuit of Figure 12) Item Description Part Number Value C1 Ceramic Capacitor TDK C4532X7R2A105M 1 µF, 100V C2 Ceramic Capacitor TDK C4532X7R1E156M 15 µF, 25V C3 Ceramic Capacitor Kemet C1206C104K5RAC 0.1 µF, 50V C4 Ceramic Capacitor Kemet C1206C223K5RAC 0.022 µF, 50V C5 Ceramic Capacitor TDK C3216X7R2A104M 0.1 µF, 100V D1 Schottky Power Diode Diodes Inc.
PAGE 15
LM5009 www.ti.com SNVS402G – FEBRUARY 2006 – REVISED FEBRUARY 2013 REVISION HISTORY Changes from Revision F (February 2013) to Revision G • 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 1-Nov-2013 (6) Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead/Ball Finish values may wrap to two lines if the finish value exceeds the maximum column width. Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided.
PAGE 18
PACKAGE MATERIALS INFORMATION www.ti.com 11-Oct-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 LM5009SDC/NOPB WSON NGU 8 1000 178.0 12.4 4.3 4.3 1.3 8.0 12.0 Q1 LM5009SDCX/NOPB WSON NGU 8 4500 330.0 12.4 4.3 4.3 1.3 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) LM5009SDC/NOPB WSON NGU 8 1000 210.0 185.0 35.0 LM5009SDCX/NOPB WSON NGU 8 4500 367.0 367.0 35.
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MECHANICAL DATA NGU0008B SDC08B (Rev A) www.ti.
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