NSC LP3984IBP-1.5, LP3984I-1.8MWC, LP3984I-1.8MDC, LP3984I-1.5MWC, LP3984I-1.5MDC Datasheet

November 2001

LP3984

Micropower, 150mA Ultra Low-Dropout CMOS Voltage Regulator in Subminiature 4-I/O micro SMD Package

General Description

The LP3984 is designed for portable and wireless applications with demanding performance and space requirements.

The LP3984's performance is optimized for battery powered systems to deliver extremely low dropout voltage and low quiescent current. Regulator ground current increases only slightly in dropout, further prolonging the battery life.

Power supply rejection is better than 60 dB at low frequencies and starts to roll off at 10 kHz. High power supply rejection is maintained down to lower input voltage levels common to battery operated circuits.

The device is ideal for mobile phone and similar battery powered wireless applications. It provides up to 150 mA, from a 2.5V to 6V input, consuming less than 1.2µA in disable mode and has fast turn-on time less than 20µs.

The LP3984 is available in micro SMD and 5 pin SOT-23 package. Performance is specified for −40ÊC to +125ÊC temperature range and is available in 1.5V, 1.8V, 2.0V, and 3.1V output voltages. For other output voltage options from 1.5V to 3.5V, please contact National Semiconductor sales office.

n60dB PSRR at 1kHz, 40dB at 10kHz @ 3.1VIN

n≤1.2µA quiescent current when shut down

nFast Turn-On time: 20 µs (typ.)

n75mV typ dropout with 150mA load

n−40 to +125ÊC junction temperature range for operation

n1.5V, 1.8V, 2.0V, and 3.1V

Features

nMiniature 4-I/O micro SMD and SOT-23-5 package

nLogic controlled enable

nStable with tantalum capacitors

n1 µF Tantalum output capacitor

nFast turn-on

nThermal shutdown and short-circuit current limit

Applications

nCDMA cellular handsets

nWideband CDMA cellular handsets

nGSM cellular handsets

nPortable information appliances

Key Specifications

n2.5 to 6.0V input range

n150mA guaranteed output

Typical Application Circuit

20020402

Note: Pin Numbers in parenthesis indicate micro SMD package.

I/O-4 Subminiature in Regulator Voltage CMOS Dropout-Low Ultra 150mA Micropower, LP3984 Package SMD micro

© 2001 National Semiconductor Corporation

DS200204

www.national.com

LP3984

Block Diagram

					20020401
Pin Descriptions
	Name		µSMD	SOT	Function
	VEN		4	3	Enable Input Logic, Enable High
	GND		1	2	Common Ground
	VOUT		2	5	Output Voltage of the LDO
	VIN		3	1	Input Voltage of the LDO
	N.C.			4	No Connection
Connection Diagrams					micro SMD, 4 Bump Package
	SOT-23-5 Package

20020407

Top View

See NS Package Number MF05A

20020470

Top View

See NS Package Number BPA04

Note: The actual physical placement of the package marking will vary from part to part. The package marking will designate the date code. Package marking does not correlate to device type in any way.

www.national.com

2

Ordering Information

For micro SMD Package

	Output	Grade	LP3984 Supplied as 250	LP3984 Supplied as 3000
	Voltage (V)		Units, Tape and Reel	Units, Tape and Reel
	1.5	STD	LP3984IBP-1.5	LP3984IBPX-1.5
	1.8	STD	LP3984IBP-1.8	LP3984IBPX-1.8
	2.0	STD	LP3984IBP-2.0	LP3984IBPX-2.0
	3.1	STD	LP3984IBP-3.1	LP3984IBPX-3.1

For SOT Package

	Output	Grade	LP3984 Supplied as 1000	LP3984 Supplied as 3000	Package Marking
	Voltage (V)		Units, Tape and Reel	Units, Tape and Reel
	1.5	STD	LP3984IMF-1.5	LP3984IMFX-1.5	LEAB
	1.8	STD	LP3984IMF-1.8	LP3984IMFX-1.8	LEBB
	2.0	STD	LP3984IMF-2.0	LP3984IMFX-2.0	LECB
	3.1	STD	LP3984IMF-3.1	LP3984IMFX-3.1	LEDB

LP3984

3	www.national.com

LP3984

Absolute Maximum Ratings (Notes 1,

2)

If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications.

VIN,VOUT, VEN	−0.3 to 6.5V
Junction Temperature	150ÊC
Storage Temperature	−65ÊC to +150ÊC
Lead Temp. (Note 3)	235ÊC
Pad Temp. (Note 3)	235ÊC
Power Dissipation (Note 4)
qJA (SOT23-5)	220ÊC/W
qJA (micro SMD)	340ÊC/W
Maximum Power Dissipation
SOT23-5	364mW
Micro SMD	235mW

ESD Rating(Note 5)
Human Body Model	2kV
Machine Model	200V

Operating Ratings (Notes 1, 2)

VIN	2.5 to 6V
VEN	0 to (VIN + 0.3V)
Junction Temperature	−40ÊC to +125ÊC
Maximum Power Dissipation (Note 6)
SOT23-5	250mW
micro SMD	160mW

Electrical Characteristics

Unless otherwise specified: VIN = 2.5V for 1.5, 1.8, & 2.0V options, VIN = VOUT + 0.5 for output options higher than 2.5V, CIN = 1 µF, IOUT = 1mA, COUT = 1 µF, tantalum. Typical values and limits appearing in standard typeface are for TJ = 25ÊC. Limits appearing in boldface type apply over the entire junction temperature range for operation, −40ÊC to +125ÊC. (Note 7) (Note 8)

Symbol	Parameter	Conditions	Typ		Limit		Units
				Min		Max
	Output Voltage			−1.2		1.2	% of
	Tolerance			−2.0		2.0	VOUT(nom)
	Line Regulation Error	VIN = 2.5V to 4.5V for 1.5, 1.8, 2.0V	0.05	−0.15		0.15
		options					%/V
DVOUT		VIN = (VOUT + 0.5V) to 4.5V for
		Voltage options higher than 2.5V
	Load Regulation Error	IOUT = 1 mA to 150 mA	0.002			0.005
	(Note 9)	LP3984IM5 (SOT23-5)					%/mA
		LP3984IBP (micro SMD)	0.0009			0.002
		VIN = VOUT(nom) + 0.2V,	60
		f = 1 kHz,
PSRR	Power Supply Rejection Ratio	IOUT = 50 mA (Figure 2)					dB
		VIN = VOUT(nom) + 0.2V,	40
		f = 10 kHz,
		IOUT = 50 mA (Figure 2)
IQ	Quiescent Current	VEN = 1.4V, IOUT = 0 mA	80			125
		VEN = 1.4V, IOUT = 0 to 150 mA	110			150	µA
		VEN = 0.4V	0.005			1.2
	Dropout Voltage (Note 10)	IOUT = 1 mA	0.6			2.5
		IOUT = 50 mA	25			40	mV
		IOUT = 100 mA	50			80
		IOUT = 150 mA	75			120
ISC	Short Circuit Current Limit	Output Grounded	600				mA
		(Steady State)
IOUT(PK)	Peak Output Current	VOUT ³ VOUT(nom) - 5%	600	300			mA
TON	Turn-On Time		20				µs
	(Note 11)
en	Output Noise Voltage	BW = 10 Hz to 100 kHz,	90				µVrms
		COUT = 1µF tant.
IEN	Maximum Input Current at EN	VEN = 0.4 and VIN = 6.0	±1				nA

www.national.com

4