LDS3985G19R datasheet, PDF - EEWORLD Datasheet

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LDS3985G19R: Description1.9V FIXED POSITIVE LDO REGULATOR, 0.25V DROPOUT, PDSO5, ROHS COMPLIANT, TSOT-23, 5 PIN; CategoryPower/power management The power supply circuit; File Size466KB，21 Pages; ManufacturerSTMicroelectronics; Websitehttp://www.st.com/

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LDS3985G19R Overview

1.9V FIXED POSITIVE LDO REGULATOR, 0.25V DROPOUT, PDSO5, ROHS COMPLIANT, TSOT-23, 5 PIN

LDS3985G19R Parametric

Parameter Name	Attribute value
Maker	STMicroelectronics
Parts packaging code	SOT-23
package instruction	ROHS COMPLIANT, TSOT-23, 5 PIN
Contacts	5
Reach Compliance Code	unknown
ECCN code	EAR99
Adjustability	FIXED
Maximum drop-back voltage 1	0.25 V
Nominal dropback voltage 1	0.15 V
Maximum absolute input voltage	6 V
Maximum input voltage	6 V
Minimum input voltage	2.5 V
JESD-30 code	R-PDSO-G5
length	2.9 mm
Maximum grid adjustment rate	0.0068%
Maximum load regulation	0.057%
Number of functions	1
Output times	1
Number of terminals	5
Working temperatureTJ-Max	125 °C
Working temperature TJ-Min	-40 °C
Maximum output current 1	0.3 A
Maximum output voltage 1	1.975 V
Minimum output voltage 1	1.825 V
Nominal output voltage 1	1.9 V
Package body material	PLASTIC/EPOXY
encapsulated code	TSSOP
Encapsulate equivalent code	TSOP5/6,.11,37
Package shape	RECTANGULAR
Package form	SMALL OUTLINE, THIN PROFILE, SHRINK PITCH
method of packing	TAPE AND REEL
Certification status	Not Qualified
Regulator type	FIXED POSITIVE SINGLE OUTPUT LDO REGULATOR
Maximum seat height	1.1 mm
surface mount	YES
technology	BICMOS
Terminal form	GULL WING
Terminal pitch	0.95 mm
Terminal location	DUAL
Maximum voltage tolerance	3%
width	1.6 mm

LDS3985G19R Preview

LDS3985xx

Ultra low drop-low noise BiCMOS 300 mA volt. reg.

for use with very low ESR output capacitor

Features

■

Input voltage from 2.5 V to 6 V

Stable with low ESR ceramic capacitors

Ultra low dropout voltage (150 mV typ. at

300 mA load, 0.4 mV typ. at 1 mA load)

Very low quiescent current (85 µA typ. at no

load, 200 µA typ. at 300 mA load;

max 1.5 µA in OFF mode)

Guaranteed output current up to 300 mA

Wide range of output voltage:

from 1.25 V to 5.0 V

Fast turn-on time: typ. 240 µs

= 2.2 µF, C

BYP

= 33 nF and I

= 1 mA]

Logic-controlled electronic shutdown

Internal current and thermal limit

Output low noise voltage 30 µV

RMS

over 10 Hz

to 100 kHz

SVR of 55 dB at 1 kHz, 50 dB at 10 kHz

Temperature range: -40 °C to 125 °C

It is stable with ceramic and high quality tantalum

capacitor. The ultra low drop voltage, low

quiescent current and low noise makes it suitable

for low power applications and in battery powered

systems. Regulator ground current increases only

slightly in dropout, further prolonging the battery

life. Shutdown logic control function is available,

this means that when the device is used as local

regulator, it is possible to put a part of the board in

standby, decreasing the total power consumption.

Typical applications are in mobile phone and

similar battery powered wireless systems,

portable information appliances.

DFN6

SOT23-5L

TSOT23-5L

■

Description

The LDS3985 provides up to 300 mA, from 2.5 V

to 6 V input voltage.

Table 1.

Device summary

Part number

LDS3985XX15

LDS3985XX18

LDS3985XX25

LDS3985XX28

LDS3985XX30

LDS3985XX33

Output voltage

1.5 V

1.8 V

2.5 V

2.8 V

3.0 V

3.3 V

June 2008

Rev 5

1/21

www.st.com

LDS3985xx

Contents

Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Order codes

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

2/21

LDS3985xx

Diagram

Figure 1.

Diagram

Schematic diagram

3/21

Pin configuration

LDS3985xx

Figure 2.

Pin configuration

Pin connections (top view for SOT and TSOT, top through view for DFN6)

SOT23-5L/TSOT23-5L

DFN6

Table 2.

Pin n° for

SOT23-5L/

TSOT23-5L

Pin description

Pin n° for

DFN6

Symbol

GND

INH

BYPASS

N.C.

Input voltage of the LDO

Common ground

Inhibit input voltage: ON MODE when V

INH

≥

1.2 V, OFF MODE when V

INH

≤

0.4 V (Do not leave floating, not internally pulled down/up)

Bypass pin: connect an external capacitor (usually 10 nF) to minimize

noise voltage

Output voltage of the LDO

Not connect

Name and function

4/21

LDS3985xx

Typical application

Figure 3.

Typical application

Typical application circuit

5/21

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