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LM5007

LM5007 High Voltage (80V) Step Down Switching Regulator

Literature Number: SNVS252E

LM5007

April 22, 2011

High Voltage (80V) Step Down Switching Regulator

General Description

The LM5007 Step Down Switching Regulator features all of

the functions needed to implement low cost, efficient, Buck

bias regulators. This high voltage regulator contains an 80 V,

0.7A N-Channel Buck Switch. The device is easy to apply and

is provided in the MSOP-8 and the thermally enhanced LLP-8

packages. The regulator is based on a hysteretic control

scheme using an on time inversely proportional to VIN. This

feature allows the operating frequency to remain relatively

constant with load and input voltage variations. The hysteretic

control requires no control loop compensation, while provid-

ing very fast load transient response. An intelligent current

limit is implemented in the LM5007 with forced off time that is

inversely proportional to VOUT. This current limiting scheme

reduces load current foldback. Additional protection features

include: Thermal Shutdown, Vcc undervoltage lockout, gate

drive undervoltage lockout, and Max Duty Cycle limiter.

Features

■Integrated 80V, 0.7A N-Channel Buck Switch

■Internal HV Vcc Regulator

■No Control Loop Compensation Required

■Ultra-Fast Transient Response

■On Time Varies Inversely with Line Voltage

■Operating Frequency Nearly Constant with Varying Line

Voltage

■Adjustable Output Voltage

■Highly Efficient Operation

■Precision Reference

■Low Bias Current

■Intelligent Current Limit Protection

■Thermal Shutdown

■External Shutdown Control

Typical Applications

■Non-Isolated Buck Regulator

■Secondary High Voltage Post Regulator

■+42V Automotive Systems

Package

■MSOP - 8

■LLP - 8 (4mm x 4mm)

Connection Diagram

20078302

8-Lead MSOP, LLP

Ordering Information

Order Number Package Type NSC Package Drawing Supplied As

LM5007MM MSOP-8 MUA08A 1000 Units on Tape and Reel

LM5007MMX MSOP-8 MUA08A 3500 Units on Tape and Reel

LM5007SD LLP-8 SDC08A 1000 Units on Tape and Reel

LM5007SDX LLP-8 SDC08A 4500 Units on Tape and Reel

LM5007 High Voltage (80V) Step Down Switching Regulator

Typical Application Circuit and Block Diagram

20078301

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LM5007

Pin Descriptions

Pin Name Description Application Information

1 SW Switching Node Power switching node. Connect to the LC output filter.

2 BST Boost Boot–strap capacitor input An external capacitor is required between the BST

and the SW pins. A 0.01uF ceramic capacitor is

recommended. An internal diode between Vcc and

BST completes the Buck gate drive bias network.

3 RCL Current Limit OFF time programming pin

Toff = 10-5 / (0.59 + (FB / 7.22 x 10− 6 x RCL))

A resistor between this pin and RTN determines the

variation of off time, along with the FB pin voltage, per

cycle while in current limit. The off time is preset to

17uS if FB =0V and decreases as the FB pin voltage

increases.

4 RTN Circuit Ground

5 FB Feedback Signal from Regulated Output This pin is connected to the inverting input of the

internal regulation comparator. The regulation

threshold is 2.5V.

6 RON On time set pin

Ton = 1.42 x 10-10 RON / Vin

A resistor between this pin and Vin sets the switch on

time as a function of Vin. The minimum recommended

on time is 300ns at the maximum input voltage.

7 Vcc Output from the internal high voltage bias regulator.

VCC is nominally regulated to 7 Volts

If an auxiliary voltage is available to raise the voltage

on this pin, above the regulation setpoint (7V), the

internal series pass regulator will shutdown, reducing

the IC power dissipation. Do not exceed 14V. This

output provides gate drive power for the internal Buck

switch. An internal diode is provided between this pin

and the BST pin. A local 0.1uF decoupling capacitor

is recommended. Series pass regulator is current

limited to 10mA.

8 Vin Input supply voltage Recommended operating range: 9V to 75V.

- EP Exposed PAD, underside of the LLP package

option

Internally bonded to the die substrate. Connect to

GND potential for low thermal impedance.

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LM5007

Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales Office/

Distributors for availability and specifications.

VIN to GND 80V

BST to GND 94V

SW to GND (Steady State) -1V

ESD Rating (Note 5)

Human Body Model 2kV

Machine Model 200V

BST to VCC 80V

BST to SW 14V

VCC to GND 14V

All Other Inputs to GND -0.3 to 7V

Lead Temperature (Soldering 4 sec) 260°C

Storage Temperature Range -55°C to +150°C

Operating Ratings (Note 1)

VIN 9V to 75V

Junction Temperature −40°C to + 125°C

Electrical Characteristics

Specifications with standard typeface are for TJ = 25°C, and those with boldface type apply over full Operating Junction Tem-

perature range. VIN = 48V, unless otherwise stated (Note 3).

Symbol Parameter Conditions Min Typ Max Units

Startup Regulator

VCC Reg VCC Regulator Output 6.6 77.4 V

VCC Current Limit (Note 4) 11 mA

VCC Supply

VCC undervoltage Lockout

Voltage (VCC increasing)

6.3 V

VCC Undervoltage Hysteresis 206 mV

VCC UVLO Delay (filter) 3 µs

Operating Current (ICC) Non-Switching, FB = 3V 500 675 µA

Shutdown/Standby Current RON = 0V 100 200 µA

Switch Characteristics

Buck Switch Rds(on) ITEST = 200mA,

VBST −VSW = 6.3V

(Note 6)

0.74 1.34 Ω

Gate Drive UVLO (VBST – VSW) Rising 3.4 4.5 5.5 V

Gate Drive UVLO Hysteresis 400 mV

Breakdown Voltage

VIN to Ground

TJ = 25°C

TJ = -40°C to +125°C

Breakdown Voltage

BST to VCC

TJ = 25°C

TJ = -40°C to +125°C

Current Limit

Current Limit Threshold 535 725 900 mA

Current Limit Response Time Iswitch Overdrive = 0.1A Time

to Switch Off

225 ns

OFF time generator (test 1) FB=0V, RCL = 100K 17 µs

OFF time generator (test 2) FB=2.3V, RCL = 100K 2.65 µs

On Time Generator

TON -1 Vin = 10V

Ron = 200K

2.15 2.77 3.5 µs

TON -2 Vin = 75V

Ron = 200K

290 390 490 ns

Remote Shutdown Threshold Rising 0.45 0.7 1.1 V

Remote Shutdown Hysteresis 40 mV

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LM5007

Symbol Parameter Conditions Min Typ Max Units

Minimum Off Time

Minimum Off Timer FB = 0V 300 ns

Regulation and OV Comparators

FB Reference Threshold Internal reference

Trip point for switch ON

2.445 2.5 2.550 V

FB Over-Voltage Threshold Trip point for switch OFF 2.875 V

FB Bias Current 100 nA

Thermal Shutdown

Tsd Thermal Shutdown Temp. 165 °C

Thermal Shutdown Hysteresis 25 °C

Thermal Resistance

θJA Junction to Ambient MUA Package 200 °C/W

SDC Package 40 °C/W

Note 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 guaranteed specifications and test conditions, see the Electrical Characteristics.

Note 2: For detailed information on soldering plastic MSOP and LLP packages, refer to the Packaging Data Book available from National Semiconductor

Corporation.

Note 3: All limits are guaranteed. All electrical characteristics having room temperature limits are tested during production with TA = TJ = 25°C. All hot and cold

limits are guaranteed by correlating the electrical characteristics to process and temperature variations and applying statistical process control.

Note 4: The VCC output is intended as a self bias for the internal gate drive power and control circuits. Device thermal limitations limit external loading.

Note 5: The human body model is a 100pF capacitor discharge through a 1.5kΩ resistor into each pin. The machine model is a 200pF capacitor discharged

directly into each pin. The machine model ESD compliance level for Pin 5 is 150V. The human body ESD compliance level for Pin 7 and 8 is 1000V.

Note 6: For devices procurred in the LLP-8 package the Rds(on) limits are guaranteed by design characterization data only.

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LM5007

Detailed Operating Description

The LM5007 Step Down Switching Regulator features all of

the functions needed to implement low cost, efficient, Buck

bias regulators. This high voltage regulator contains an 80V,

0.7A N-Channel Buck Switch. The device is easy to apply and

is provided in the MSOP-8 and the thermally enhanced LLP-8

packages. The regulator is based on a hysteretic control

scheme using an on time inversely proportional to Vin. This

feature allows the operating frequency to remain relatively

constant with load and input voltage variations. The hysteretic

control requires no control loop compensation, while provid-

ing very fast load transient response. An intelligent current

limit scheme is implemented in the LM5007 with forced off

time, after current limit detection, which is inversely propor-

tional to Vout. This current limiting scheme reduces load

current foldback. Additional protection features include: Ther-

mal Shutdown, Vcc undervoltage lockout, Gate drive under-

voltage lockout and Max Duty Cycle limiter. The LM5007 can

be applied in numerous applications to efficiently regulate

step down higher voltage inputs. This regulator is well suited

for 48 Volt Telcom and the new 42V Automotive power bus

ranges.

Hysteretic Control Circuit Overview

The LM5007 is a Buck DC-DC regulator that uses an on time

control scheme. The on time is programmed by an external

resistor and varies inversely with line input voltage (Vin). The

core regulation elements of the LM5007 are the feedback

comparator and the on time one-shot. The regulator output

voltage is sensed at the feedback pin (FB) and is compared

to an internal reference voltage (2.5V). If the FB signal is be-

low the reference voltage, the buck switch is turned on for a

fixed time pulse determined by the line voltage and a pro-

gramming resistor (RON). Following the on period the switch

will remain off for at least the minimum off timer period of

300ns. If the FB pin voltage is still below the reference after

the 300ns off time, the switch will turn on again for another on

time period. This switching behavior will continue until the FB

pin voltage reaches the reference voltage level.

The LM5007 operates in discontinuous conduction mode at

light load currents or continuous conduction mode at heavier

load currents. In discontinuous conduction mode, current

through the output inductor starts at zero and ramps up to a

peak value during the buck switch on time and then back to

zero during the off time. The inductor current remains at zero

until the next on time period starts when FB falls below the

internal reference. In discontinuous mode the operating fre-

quency can be relatively low and will vary with load. Therefore

at light loads the conversion efficiency is maintained, since

the switching losses decrease with the reduction in load cur-

rent and switching frequency. The approximate discontinuous

mode operating frequency can be calculated as follows:

In continuous conduction mode, current flows continuously

through the inductor and never ramps down to zero. In this

mode the operating frequency is greater than the discontinu-

ous mode frequency and remains relatively constant with load

and line variations. The approximate continuous mode oper-

ating frequency can be calculated as follows:

The output voltage (Vout) can be programmed by two external

resistors as shown in Figure 1. The regulation point can be

calculated as follows:

VOUT = 2.5 x (R1 + R2) / R2

The feedback comparator in hysteretic regulators depend up-

on the output ripple voltage to switch the output transistor on

and off at regular intervals. In order for the internal comparator

to respond quickly to changes in output voltage, proportional

to inductor current, a minimum amount of capacitor Equiva-

lent Series Resistance (ESR) is required. A ripple voltage of

25mV to 50mV is recommended at the feedback pin (FB) for

stable operation. In cases where the intrinsic capacitor ESR

is too small, additional series resistance may be added.

For applications where lower output voltage ripple is required

the load can be connected directly to the low ESR output ca-

pacitor, as shown in Figure 1. The series resistor (R) will

degrade the load regulation. Another technique for enhancing

the ripple voltage at the FB pin is to place a capacitor in par-

allel with the feedback divider resistor R1. The addition of the

capacitor reduces the attenuation of the ripple voltage from

the feedback divider

High Voltage Bias Regulator

The LM5007 contains an internal high voltage bias regulator.

The input pin (Vin) can be connected directly to line voltages

from 9 to 75 Volts. To avoid supply voltage transients due to

long lead inductances on the input pin (Vin Pin 8), it is always

recommended to connect low ESR ceramic chip capacitor

(≊ 0.1µF) between "Vin" pin and "RTN" pin (pin 4), located

close to LM5007. The regulator is internally current limited to

10mA. Upon power up, the regulator is enabled and sources

current into an external capacitor connected to the Vcc pin.

When the voltage on the Vcc pin reaches the regulation point

of 7V, the controller output is enabled.

An external auxiliary supply voltage can be applied to the Vcc

pin. If the auxiliary voltage is greater than 7 Volts the internal

regulator will essentially shutoff, thus reducing internal power

dissipation.

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LM5007

20078305

FIGURE 1. Low Ripple Output Configuration

20078306

FIGURE 2. Self Biased Configuration

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LM5007

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 com-

parator monitors the FB pin versus an internal 2.875V refer-

ence (OV_REF). If the voltage at FB rises above OV_REF the

comparator immediately terminates the buck switch on time

pulse.

ON Time generator and Shutdown

The on time of the LM5007 is set inversely proportional to the

input voltage by an external resistor connected between Ron

and Vin. The Ron terminal is a low impedance input biased at

approximately 1.5V. Thus the current through the resistor and

into the Ron terminal is approximately proportional to Vin and

used internally to control the on timer. This scheme of input

voltage feed-forward hysteretic operation achieves nearly

constant operational frequency over varying line and load

conditions. The on time equation for the LM5007 is :

Ton = 1.42 x 10-10 x RON / VIN

The RON pin of the LM5007 also provides a shutdown function

which disables the regulator and significantly decreases qui-

escent power dissipation. By pulling the RON pin to below 0.7V

logic threshold activates the low power shutdown mode. The

VIN quiescent current in the shutdown mode is approximately

100µA internal to the LM5007 plus the current in the RON re-

sistor.

20078307

FIGURE 3. Shutdown Implementation

Current Limit

The LM5007 contains an intelligent current limit off timer in-

tended 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 on time is immedi-

ately terminated (cycle by cycle current limit). Following the

termination of the cycle a non-resetable current limit off timer

is initiated. The duration of the off time is a function of the

external resistor (RCI) and the FB pin voltage. When the FB

pin voltage equals zero, the current limit off time is internally

preset to 17uS. This condition occurs in short circuit operation

when a maximum amount of off time is required.

In cases of overload (not complete short circuit) the current

limit off time can be reduced as a function of the output voltage

(measured at the FB pin). Reducing the off time with smaller

overloads reduces the amount of foldback and also reduces

the initial start-up time. The current limit off time for a given

FB pin voltage and RCI resistor can be calculated by the fol-

lowing equation:

Applications utilizing low resistance inductors and/or a low

voltage drop rectifier may require special evaluation at high

line, short circuit conditions. In this special case the preset

17uS (FB = 0V) off time may be insufficient to balance the

inductor volt*time product. Additional inductor resistance, out-

put resistance or a larger voltage drop rectifier may be nec-

essary to balance the inductor cycle volt*time product and

limit the short circuit current.

N - Channel Buck Switch and Driver

The LM5007 integrates an N-Channel Buck switch and as-

sociated floating high voltage gate driver. This gate driver

circuit works in conjunction with an external bootstrap capac-

itor and an internal high voltage diode. The bootstrap capac-

itor is charged by VCC through the internal high voltage diode.

A 0.01uF ceramic capacitor connected between the BST pin

and SW pin is recommended.

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LM5007

During each cycle when the Buck switch turns off, the SW pin

is approximately 0V. When the SW pin voltage is low, the

bootstrap capacitor will be charged from Vcc through the in-

ternal diode. The minimum off timer, set to 300ns, ensures

that there will be a minimum interval every cycle to recharge

the bootstrap capacitor.

An external re-circulating diode from the SW pin to ground is

necessary to carry the inductor current after the internal Buck

switch turns off. This external diode must be of the Ultra-fast

or Schottky type to reduce turn-on losses and current over-

shoot. The reverse voltage rating of the re-circulating diode

must be greater than the maximum line input voltage.

Thermal Protection

Internal Thermal Shutdown circuitry is provided to protect the

integrated circuit in the event the maximum junction temper-

ature 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 fea-

ture is provided to prevent catastrophic failures from acciden-

tal device overheating.

Minimum Load Current

A minimum load current of 1 mA is required to maintain proper

operation. If the load current falls below that level, the boot-

strap capacitor may discharge during the long off-time, and

the circuit will either shutdown, or cycle on and off at a low

frequency. If the load current is expected to drop below 1 mA

in the application, the feedback resistors should be chosen

low enough in value so they provide the minimum required

current at nominal Vout.

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LM5007

Operational Waveforms

20078308

LM5007 Operation: VOUT = 10V, VIN = 20V, IOUT = 250mA

CH1: Switch Node, CH2: VOUT (AC), CH4: Inductor Current

FIGURE 4.

Operational Waveforms

20078309

LM5007 Operation: VOUT = 10V, VIN = 75V, IOUT = 250mA

CH1: Switch Node, CH2: VOUT (AC), CH4: Inductor Current

FIGURE 5.

LM5007 10V Output Efficiency

20078310

FIGURE 6.

Current Limit VFB vs TOFF

RCL = 50k -600k

20078311

FIGURE 7.

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LM5007

20078312

FIGURE 8. VIN vs TON

RON = 100k, 200k, 300k

10V, 400mA Demo Board Bill of Materials

ITEM PART NUMBER DESCRIPTION VALUE

C1 C4532X7R2A105M CAPACITOR, CER, TDK 1µ, 100V

C2 C4532X7R1E156M CAPACITOR, CER, TDK 15µ, 25V

C3 C1206C104K5RAC CAPACITOR, CER, KEMET 0.1µ, 50V

C4 C1206C103K5RAC CAPACITOR, CER, KEMET 0.01µ, 50V

C5 C3216X7R2A104KT CAPACITOR, CER, TDK 0.1µ, 100V

D1 MURA110T3 DIODE, 100V, ON SEMI

L1 SLF7045T-101MR60-1 BUCK INDUCTOR, TDK 100µH

R1 CRCW12062003F RESISTOR 200K

R2 CRCW12061003F RESISTOR 100K

R3 CRCW12063011F RESISTOR 3.01K

R4 CRCW12061001F RESISTOR 1K

R5 CRCW12061R00F RESISTOR 1

U1 LM5007 REGULATOR, NATIONAL

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LM5007

Physical Dimensions inches (millimeters) unless otherwise noted

8-Lead MSOP Package

NS Package Number MUA08A

8-Lead LLP Package

NS Package Number SDC08A

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LM5007

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LM5007

Notes

LM5007 High Voltage (80V) Step Down Switching Regulator

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