L4971D013TR STMicroelectronics, L4971D013TR Datasheet

L4971D013TR

Manufacturer Part Number

L4971D013TR

Description

IC REG STEP DOWN 1.5A 16-SOIC

Manufacturer

STMicroelectronics

Type

Step-Down (Buck)r

Datasheet

1.L4971D013TR.pdf (13 pages)

Specifications of L4971D013TR

Internal Switch(s)

Yes

Synchronous Rectifier

Number Of Outputs

Voltage - Output

3.3 ~ 50 V

Current - Output

1.5A

Frequency - Switching

100kHz ~ 300kHz

Voltage - Input

8 ~ 55 V

Operating Temperature

0°C ~ 125°C

Mounting Type

Surface Mount

Package / Case

16-SOIC (0.300", 7.5mm Width)

Power - Output

800mW

Output Voltage

50 V

Mounting Style

SMD/SMT

For Use With

497-4744 - BOARD EVAL FOR L4971/L4978 REG

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Other names

497-3357-2

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Meier Automation Equipment Co., Limited

Part Number:

L4971D013TR

Manufacturer:

SOP16

Quantity:

20 000

Company:

Amily Shenzhen XNWY Technology Co., Ltd

Part Number:

L4971D013TR

Company:

H&T Electronics

Part Number:

L4971D013TR

Quantity:

Company:

H&T Electronics

Part Number:

L4971D013TR

Quantity:

9 000

Company:

H&T Electronics

Part Number:

L4971D013TR

Quantity:

9 000

Current page: 1 of 13
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■

The L4971 is a step down monolithic power

switching regulator delivering 1.5A at a voltage be-

tween 3.3V and 50V (selected by a simple external

divider). Realized in BCD mixed technology, the

device uses an internal power D-MOS transistor

(with a typical Rdson of 0.25Ω) to obtain very high

efficency and high switching speed.

Figure 1. Block Diagram

May 2005

UP TO 1.5A STEP DOWN CONVERTER

OPERATING INPUT VOLTAGE FROM 8V TO

55V

PRECISE 3.3V (±1%) INTERNAL

REFERENCE VOLTAGE

OUTPUT VOLTAGE ADJUSTABLE FROM

3.3V TO 50V

SWITCHING FREQUENCY ADJUSTABLE UP

TO 300KHz

VOLTAGE FEEDFORWARD

ZERO LOAD CURRENT OPERATION

INTERNAL CURRENT LIMITING (PULSE-

BYPULSE AND HICCUP MODE)

INHIBIT FOR ZERO CURRENT

CONSUMPTION

PROTECTION AGAINST FEEDBACK

DISCONNECTION

THERMAL SHUTDOWN

SOFT START FUNCTION

FEATURES

DESCRIPTION

Vi=8V to 55V

220µF

63V

220nF

1.5A STEP DOWN SWITCHING REGULATOR

100nF

2.7nF

20K

L4971

9.1K

22nF

A switching frequency up to 300KHz is achievable

(the maximum power dissipation of the packages

must be observed).

A wide input voltage range between 8V to 55V and

output voltages regulated from 3.3V to 50V cover

the majority of today’s applications.

Features of this new generations of DC-DC con-

verter include pulse-by-pulse current limit, hiccup

mode for short circuit protection, voltage feedfor-

ward regulation, soft-start, protection against feed-

back loop disconnection, inhibit for zero current

consumption and thermal shutdown.

The device is available in plastic dual in line, DIP8

for standard assembly, and SO16W for SMD as-

sembly.

Figure 1. Package

Table 1. Order Codes

100nF

L4971D013TR

Part Number

D97IN748A

L4971D

L4971

3L60U

STPS

DIP8

(77120)

126µH

330µF

SO16 in Tape & Reel

=3.3V/1.5A

SO16W

Package

SO16W

DIP8

L4971

Rev. 11

1/13

Related parts for L4971D013TR

L4971D013TR Summary of contents

Page 1

... SO16W for SMD as- sembly 20K L4971 2.7nF 100nF C 4 22nF DIP8 Part Number L4971 L4971D L4971D013TR SO16 in Tape & Reel =3.3V/1.5A O 126µH (77120 100nF C STPS 8 330µF 3L60U D97IN748A L4971 SO16W Package DIP8 SO16W Rev. 11 ...

Page 2

L4971 Figure 2. Block Diagram THERMAL SHUTDOWN 2 SS_INH INHIBIT 7 COMP 8 E/A FB 3.3V OSCILLATOR 3 OSC Figure 3. Pin Connections GND 1 SS_INH 2 OSC 3 OUT 4 D97IN595 DIP8 Table 2. Pin Description DIP SO (*) ...

Page 3

Table 3. Absolute Maximum Ratings Symbol Minidip S016 V V Input voltage Output DC voltage 5 6 Output peak voltage 0.1µs f=200KHz Maximum output current ...

Page 4

L4971 Table 25°C, Cosc = 2.7nF, Rosc = 20kΩ Specification Refered to T Soft Start Soft start charge current Soft start discharge current Inhibit V Low level voltage LL I Isource Low level sLL ...

Page 5

Table 6. Typical Performance (Using Evaluation Board) fsw = 100kHz Output Output Voltage Ripple 3.3V 10mV 5.1V 10mV 12V 12mV Figure 4. Test and valuation board circuit. Vi=8V to 55V 220µF 220nF 63V C1=220µF/63V EKE C2=2.7nF ...

Page 6

L4971 Figure 6. Quiescent drain current vs. input voltage. Iq (mA) 200KHz R =22K 1 C =1.2nF Tamb=25˚ Figure 7. Quiescent ...

Page 7

Figure 12. Switching Frequency vs. input voltage. fsw (KHz) 107.5 105.0 102.5 100.0 97.5 95.0 92.5 90 Figure 13. Switching frequency vs. junction temperature. fsw (KHz) 105 100 ...

Page 8

L4971 Figure 18. Efficiency vs. output current. η (%) 90 V =12V CC V =24V =48V 0.2 0.4 0.6 0.8 1.0 1.2 1.4 I Figure 19. Efficiency vs. output current. ...

Page 9

Figure 24. Load transient. Figure 25. Line transient ( 1ms/DIV Figure 26. Soft start capacitor selection Vs inductor and Vccmax. L 680nF (µH) fsw=100KHz 400 300 200 100 0 ...

Page 10

L4971 Figure 29. DIP8 Mechanical Data & Package Dimensions mm DIM. MIN. TYP. MAX. A 3.32 a1 0.51 B 1.15 1.65 b 0.356 0.55 b1 0.204 0.304 D 10.92 E 7.95 9.75 e 2.54 e3 7.62 e4 7.62 F 6.6 ...

Page 11

Figure 30. SO16 Mechanical Data & Package Dimensions mm DIM. MIN. TYP. MAX. A 2.35 2.65 A1 0.10 0.30 B 0.33 0.51 C 0.23 0.32 (1) 10.10 10. 7.40 7.60 e 1.27 H 10.0 10.65 h 0.25 0.75 ...

Page 12

L4971 4 REVISION HISTORY Table 7. Revision History Date Revision October 2004 May 2005 12/13 10 First Issue in EDOCS 11 Updated the Layout look & feel. Changed name of the D1 on the figs. 1 and 4. Description of ...

Page 13

... No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics ...

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