NSC LM2591HVT-ADJ Datasheet

LM2591HV SIMPLE SWITCHER

Power Converter 150 kHz 1A

Step-Down Voltage Regulator

General Description

The LM2591HV series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, capable of driving a 1A load with excellent line and load regulation. These devices are available in fixed output voltages of 3.3V, 5V, and an adjustable output version.

This series of switching regulators is similar to the LM2590HV, but without some of the supervisory and performance features of the latter.

Requiring a minimum number of external components, these regulators are simple to use and include internal frequency compensation fixed-frequency oscillator.

The LM2591HV operates at a switching frequency of 150 kHz thus allowing smaller sized filter components than what would be needed with lower frequency switching regulators. Available in a standard 5-lead TO-220 package with several different lead bend options, and a 5-lead TO-263 Surface mount package.

Other features include a guaranteed put voltage under all conditions of input voltage and output load conditions, and ternal shutdown is included, featuring typically 90 µA standby current. Self protection features include a two stage

†

, improved line and load specifications and a

4% tolerance on out-

15% on the oscillator frequency. Ex-

July 2003

current limit for the output switch and an over temperature shutdown for complete protection under fault conditions.

Features

n 3.3V, 5V, and adjustable output versions n Adjustable version output voltage range, 1.2V to 57V

4% max over line and load conditions

n Guaranteed 1A output load current n Available in 5-pin TO-220 and TO-263 (surface mount)

Package

n Input voltage range up to 60V n 150 kHz fixed frequency internal oscillator n On/Off control n Low power standby mode, I n High Efficiency n Thermal shutdown and current limit protection

typically 90 µA

Applications

n Simple high-efficiency step-down (buck) regulator n Efficient pre-regulator for linear regulators n On-card switching regulators n Positive to Negative converter

Note:†Patent Number 5,382,918.

LM2591HV SIMPLE SWITCHER Power Converter 150 kHz 1A Step-Down Voltage Regulator

Typical Application (Fixed Output Voltage Versions)

10129301

SIMPLE SWITCHER®and Switchers Made Simple®are registered trademarks of National Semiconductor Corporation.

Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/

LM2591HV

Distributors for availability and specifications.

Maximum Supply Voltage (V

ON/OFF Pin Voltage

Feedback Pin Voltage −0.3 ≤ V ≤ +25V

) 63V

−0.3 ≤ V ≤ +25V

Human Body Model (Note 2) 2 kV

Lead Temperature

S Package

Vapor Phase (60 sec.) +215˚C

Infrared (10 sec.) +245˚C

T Package (Soldering, 10 sec.) +260˚C

Maximum Junction Temperature +150˚C

Output Voltage to Ground

(Steady State) −1V

Operating Conditions

Power Dissipation Internally limited

Storage Temperature Range −65˚C to +150˚C

ESD Susceptibility

Temperature Range −40˚C ≤ TJ≤ +125˚C

Supply Voltage 4.5V to 60V

LM2591HV-3.3 Electrical Characteristics

Specifications with standard type face are for TJ= 25˚C, and those with boldface type apply over full Operating Temperature Range.

Symbol Parameter Conditions LM2591HV-3.3 Units

Typ Limit

(Note 3) (Note 4)

SYSTEM PARAMETERS (Note 5) Test Circuit Figure 1

OUT

Output Voltage 4.75V ≤ VIN≤ 60V, 0.2A ≤ I

η Efficiency V

= 12V, I

=1A 77

LOAD

≤ 1A 3.3 V

LOAD

3.168/3.135 V(min)

3.432/3.465 V(max)

(Limits)

LM2591HV-5.0 Electrical Characteristics

Specifications with standard type face are for TJ= 25˚C, and those with boldface type apply over full Operating Temperature Range.

Symbol Parameter Conditions LM2591HV-5.0 Units

Typ Limit

(Limits)

(Note 3) (Note 4)

SYSTEM PARAMETERS (Note 5) Test Circuit Figure 1

OUT

Output Voltage 7V ≤ VIN≤ 60V, 0.2A ≤ I

≤ 1A 5 V

LOAD

4.800/4.750 V(min)

5.200/5.250 V(max)

η Efficiency V

= 12V, I

=1A 82 %

LOAD

LM2591HV-ADJ Electrical Characteristics

Specifications with standard type face are for TJ= 25˚C, and those with boldface type apply over full Operating Temperature Range.

Symbol Parameter Conditions LM2591HV-ADJ Units

(Limits)

SYSTEM PARAMETERS (Note 5) Test Circuit Figure 1

η Efficiency V

Feedback Voltage 4.5V ≤ VIN≤ 60V, 0.2A ≤ I

programmed for 3V. Circuit of Figure 1. 1.193/1.180 V(min)

OUT

= 12V, V

OUT

= 3V, I

Typ Limit

(Note 3) (Note 4)

≤ 1A 1.230 V

LOAD

1.267/1.280 V(max)

=1A 76 %

LOAD

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All Output Voltage Versions Electrical Characteristics

Specifications with standard type face are for TJ= 25˚C, and those with boldface type apply over full Operating Temperature Range. Unless otherwise specified, V

= 12V for the 3.3V, 5V, and Adjustable version. I

Symbol Parameter Conditions LM2591HV-XX Units

DEVICE PARAMETERS

SAT

Feedback Bias Current Adjustable Version Only, VFB= 1.3V 10 nA

Oscillator Frequency (Note 6) 150 kHz

Saturation Voltage I

= 1A (Note 7) (Note 8) 0.95 V

OUT

DC Max Duty Cycle (ON) (Note 8) 100 %

Min Duty Cycle (OFF) (Note 9) 0

CLIM

Switch current Limit Peak Current, (Note 7) (Note 8) 1.9 A

Output Leakage Current (Note 7) (Note 9) (Note 10) Output = 0V 50 µA(max)

Output = −1V 5 mA

Operating Quiescent SD /SS Pin Open (Note 9) 5mA

Current 10 mA(max)

STBY

Standby Quiescent SD /SS pin = 0V (Note 10) 90 µA

Current 200/250 µA(max)

Thermal Resistance TO220 or TO263 Package, Junction to Case 2 ˚C/W

TO220 Package, Juncton to Ambient (Note 11) 50 ˚C/W

TO263 Package, Juncton to Ambient (Note 12) 50 ˚C/W

TO263 Package, Juncton to Ambient (Note 13) 30 ˚C/W

TO263 Package, Juncton to Ambient (Note 14) 20 ˚C/W

ON/OFF CONTROL Test Circuit Figure 1

ON /OFF Pin Logic Input

Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics.

Note 2: The human body model is a 100 pF capacitor discharged through a 1.5k resistor into each pin.

Note 3: Typical numbers are at 25˚C and represent the most likely norm.

Note 4: All limits guaranteed at room temperature (standard type face) and at temperature extremes (bold type face). All room temperature limits are 100%

production tested. All limits at temperature extremes are guaranteed via correlation using standard Statistical Quality Control (SQC) methods. All limits are used to calculate Average Outgoing Quality Level (AOQL).

Note 5: External components such as the catch diode, inductor, input and output capacitors can affect switching regulator system performance. When the LM2591HV is used as shown in the Figure 1 test circuit, system performance will be as shown in system parameters section of Electrical Characteristics.

Note 6: The switching frequency is reduced when the second stage current limit is activated. The amount of reduction is determined by the severity of current overload.

Note 7: No diode, inductor or capacitor connected to output pin.

Note 8: Feedback pin removed from output and connected to 0V to force the output transistor switch ON.

Note 9: Feedback pin removed from output and connected to 12V for the 3.3V, 5V, and the ADJ. version to force the output transistor switch OFF.

Note 10: V

Threshold Voltage Low (Regulator ON) 0.6 V(max)

High (Regulator OFF) 2.0 V(min)

ON /OFF Pin Input Current V

= 60V.

= 2.5V (Regulator OFF) 5 µA

LOGIC

= 0.5V (Regulator ON) 0.02 µA

LOGIC

= 500 mA

LOAD

Typ Limit

(Note 3) (Note 4)

50/100 nA (max)

127/110 kHz(min)

173/173 kHz(max)

1.2/1.3 V(max)

1.3/1.2 A(min)

2.8/3.0 A(max)

30 mA(max)

1.3 V

15 µA(max)

5 µA(max)

(Limits)

LM2591HV

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All Output Voltage Versions Electrical Characteristics

Note 11: Junction to ambient thermal resistance (no external heat sink) for the package mounted TO-220 package mounted vertically, with the leads soldered to

LM2591HV

a printed circuit board with (1 oz.) copper area of approximately 1 in

Note 12: Junction to ambient thermal resistance with the TO-263 package tab soldered to a single sided printed circuit board with 0.5 in

Note 13: Junction to ambient thermal resistance with the TO-263 package tab soldered to a single sided printed circuit board with 2.5 in

Note 14: Junction to ambient thermal resistance with the TO-263 package tab soldered to a double sided printed circuit board with 3 in

the LM2591HVS side of the board, and approximately 16 in model in Switchers Made Simple available at http://power.national.com.

(Continued)

of copper on the other side of the p-c board. See application hints in this data sheet and the thermal

of (1 oz.) copper area.

of (1 oz.) copper area on

Typical Performance Characteristics (Circuit of Figure 1)

Normalized

Output Voltage Line Regulation

Efficiency

10129302

10129304

10129303

Switch Saturation

Voltage

10129305

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Typical Performance Characteristics (Circuit of Figure 1) (Continued)

Switch Current Limit Dropout Voltage

LM2591HV

Operating

Quiescent Current

Minimum Operating

Supply Voltage

10129306

10129307

Shutdown

Quiescent Current

10129308 10129309

Feedback Pin

Bias Current

10129310

10129311

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Typical Performance Characteristics (Circuit of Figure 1) (Continued)

LM2591HV

Switching Frequency ON/OFF Threshold Voltage

10129313

10129379

ON/OFF Pin Current (Sinking) Internal Gain-Phase Characteristics

Continuous Mode Switching Waveforms

= 20V, V

L = 52 µH, C

A: Output Pin Voltage, 10V/div.

B: Inductor Current 0.5A/div.

C: Output Ripple Voltage, 50 mV/div.

= 100 µF, C

OUT

Horizontal Time Base: 2 µs/div.

= 5V, I

10129380

=1A

LOAD

ESR = 100 mΩ

OUT

10129320

Discontinuous Mode Switching Waveforms

= 20V, V

L = 15 µH, C

A: Output Pin Voltage, 10V/div.

B: Inductor Current 0.25A/div.

C: Output Ripple Voltage, 100 mV/div.

OUT

= 5V, I

OUT

= 150 µF, C

LOAD

OUT

Horizontal Time Base: 2 µs/div.

10129378

= 250 mA

ESR=90mΩ

10129319

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+ 14 hidden pages

NSC LM2591HVT-ADJ Datasheet

Specifications and Main Features

Frequently Asked Questions

User Manual

General Description

Features

Applications

Typical Application (Fixed Output Voltage Versions)

Absolute Maximum Ratings (Note 1)

Operating Conditions

LM2591HV-3.3 Electrical Characteristics

LM2591HV-5.0 Electrical Characteristics

LM2591HV-ADJ Electrical Characteristics

All Output Voltage Versions Electrical Characteristics

Typical Performance Characteristics (Circuit of Figure 1)