Datasheet

ManualsBrandsSTMICROELECTRONICS ManualsVoltage RegulatorsL4949EDTR-E

September 2013 Doc ID 16823 Rev 2 1/19

L4949ED-E

L4949EP-E

Multifunction very low drop

voltage regulator

Features

■

ECOPACK

: lead free and RoHS compliant

■

Automotive Grade: compliance with AEC

guidelines

■

Operating DC supply voltage range 5 V - 28 V

■

Transient supply voltage up to 40V

■

Extremely low quiescent current in standby

mode

■

High precision standby output voltage 5V±1%

■

Output current capability up to 100mA

■

Very low dropout voltage less than 0.5V

■

Reset circuit sensing the output voltage

■

Programmable reset pulse delay with external

capacitor

■

Voltage sense comparator

■

Thermal shutdown and short circuit protections

Description

The L4949ED-E and L4949EP-E are monolithic

integrated 5V voltage regulators with a very low

dropout output and additional functions as power-

on reset and input voltage sense. They are

designed for supplying the microcomputer

controlled systems especially in automotive

applications.

SO-8

SO-20W (12+4+4)

Table 1. Device summary

Package

Order codes

Tube Tape and reel

SO-8 L4949ED-E L4949EDTR-E

SO-20W L4949EP-E L4949EPTR-E

www.st.com

Summary of content (19 pages)

PAGE 1
L4949ED-E L4949EP-E Multifunction very low drop voltage regulator Features ■ ECOPACK®: lead free and RoHS compliant ■ Automotive Grade: compliance with AEC guidelines ■ Operating DC supply voltage range 5 V - 28 V ■ Transient supply voltage up to 40V ■ Extremely low quiescent current in standby mode ■ High precision standby output voltage 5V±1% ■ Output current capability up to 100mA ■ Very low dropout voltage less than 0.
PAGE 2
Contents L4949ED-E, L4949EP-E Contents 1 Block diagram and pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2 Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 3 4 5 2/19 2.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.2 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.
PAGE 3
L4949ED-E, L4949EP-E List of tables List of tables Table 1. Table 2. Table 3. Table 4. Table 5. Table 6. Table 7. Table 8. Table 9. Table 10. Table 11. Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Pin definitions and functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PAGE 4
List of figures L4949ED-E, L4949EP-E List of figures Figure 1. Figure 2. Figure 3. Figure 4. Figure 5. Figure 6. Figure 7. Figure 8. Figure 9. Figure 10. 4/19 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Configuration diagram (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Application circuit(1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PAGE 5
L4949ED-E, L4949EP-E 1 Block diagram and pin description Block diagram and pin description Figure 1. Block diagram Note: The block diagram illustrates only a major internal device functionality and it is not intended to mimic any details of hardware design Figure 2.
PAGE 6
Block diagram and pin description Table 2. L4949ED-E, L4949EP-E Pin definitions and functions Pin N° Symbol 6/19 Function SO-8 SO-20 1 19 VS Input supply voltage. Block to GND via an external capacitor (see Figure 3). 2 20 SI Sense input pin to supervise input voltage. Connect via an external voltage divider connected to VS and to GND. 3 1 VZ Preregulator output voltage. For details, see Section 3.4: Preregulator. 4 2 CT Reset pulse delay adjustment.
PAGE 7
L4949ED-E, L4949EP-E Electrical specifications 2 Electrical specifications 2.1 Absolute maximum ratings Table 3.
PAGE 8
Electrical specifications 2.3 L4949ED-E, L4949EP-E Electrical characteristics VS = 14 V; -40 °C < Tj < 125 °C unless otherwise specified Table 5. Electrical characteristics Symbol Parameter Test condition Min. Typ. Max. Unit VO Output voltage TJ = 25 °C; IO = 1 mA 4.95 5 5.05 V VO Output voltage 6 V < VIN < 28 V, 1 mA < IO < 50 mA 4.90 5 5.10 V VO Output voltage VIN = 40 V; T < 1 s; 5 mA < IO < 100 mA 4.75 5.25 V VDP Dropout voltage IO = 10 mA IO = 50 mA IO = 100 mA 0.
PAGE 9
L4949ED-E, L4949EP-E Table 7. Symbol Electrical specifications Sense Parameter Test condition Min. Typ. Max. Unit 1.16 1.23 1.35 V 20 100 200 mV Vst Sense low threshold Vsth Sense threshold hysteresis VSL Sense output low voltage VSI ≤ 1.16 V; VS ≥ 3 V RSO = 10 KΩ to VO 0.4 V ISH Sense output leakage VSO = 5 V; VSI ≥ 1.5 V 1 µA ISI Sense input current VSI = 0 Table 8. Symbol -20 -8 -3 µA Min. Typ. Max. Unit 4.
PAGE 10
Application information L4949ED-E, L4949EP-E 3 Application information Figure 3. Application circuit(1) 1. For stability: CS ≥ 1µF, CO ≥ 4.7µF, ESR < 10Ω at 10KHz. Recommended for application: CS = CO = 10 µF to 100 µF 3.1 Supply voltage transient High supply voltage transients can cause a reset output signal disturbance. For supply voltages greater than 8V the circuit shows a high immunity of the reset output against supply transients of more than 100V/µs.
PAGE 11
L4949ED-E, L4949EP-E Application information present functions are required. The modular approach of this device allows to get easily also other features and functions when required. 3.3 Voltage regulator The voltage regulator uses an Isolated Collector Vertical PNP transistor as a regulating element. Figure 4. Foldback characteristic of VO With this structure very low dropout voltage at currents up to 100mA is obtained.
PAGE 12
Application information 3.4 L4949ED-E, L4949EP-E Figure 5. Output voltage vs input voltage Figure 6. Quiescent current vs supply voltage Preregulator To improve the transient immunity a preregulator stabilizes the internal supply voltage to 5 V. This internal voltage is present at Pin 3 (VZ). This voltage should not be used as an output because the output capability is very small (≤ 10 µA).
PAGE 13
L4949ED-E, L4949EP-E 3.5 Application information Reset circuit The block circuit diagram of the reset circuit is shown in Figure 7. The reset circuit supervises the output voltage. The reset threshold of 4.5 V is defined with the internal reference voltage and standby output divider.
PAGE 14
Application information Figure 8.
PAGE 15
L4949ED-E, L4949EP-E Package and packing information 4 Package and packing information 4.1 ECOPACK® packages In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK® packages, depending on their level of environmental compliance. ECOPACK® specifications, grade definitions and product status are available at: www.st.com. ECOPACK® is an ST trademark. 4.2 SO-8 TP package information Table 9. SO-8 TP mechanical data mm Dim. Min. Typ. A a1 Max. 1.75 0.1 0.
PAGE 16
Package and packing information Figure 9. 4.3 L4949ED-E, L4949EP-E SO-8 TP package dimensions SO-20 TP package information Table 10. SO-20 TP mechanical data mm Dim. Min. Max. A 2.35 2.65 A1 0.1 0.3 B 0.33 0.51 C 0.23 0.32 D 12.6 13 E 7.4 7.6 e H 16/19 Typ. 1.27 10 Doc ID 16823 Rev 2 10.
PAGE 17
L4949ED-E, L4949EP-E Table 10. Package and packing information SO-20 TP mechanical data (continued) mm Dim. Min. Typ. Max. h 0.25 0.75 L 0.4 1.27 K 0 (min.)8 (max.) Figure 10.
PAGE 18
Revision history 5 L4949ED-E, L4949EP-E Revision history Table 11. 18/19 Document revision history Date Revision Description of changes 24-Nov-2009 1 Initial release. 20-Sep-2013 2 Updated disclaimer.
PAGE 19
L4949ED-E, L4949EP-E Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale.