NSC LP2985AIBP-2.8, LP2985AIBP-2.5, LP2985IM5X-5.0, LP2985IM5X-3.3, LP2985IM5X-2.5 Datasheet

March 2000

LP2985

Micropower 150 mA Low-Noise Ultra Low-Dropout Regulator

Designed for Use with Very Low ESR Output Capacitors

General Description

The LP2985 is a 150 mA, fixed-output voltage regulator designed to provide ultra low-dropout and low noise in battery powered applications.

Using an optimized VIP™ (Vertically Integrated PNP) process, the LP2985 delivers unequalled performance in all specifications critical to battery-powered designs:

Dropout Voltage: Typically 300 mV @ 150 mA load, and 7 mV @ 1 mA load.

Ground Pin Current: Typically 850 µA @ 150 mA load, and 75 µA @ 1 mA load.

Enhanced Stability: The LP2985 is stable with output capacitor ESR as low as 5 mΩ, which allows the use of ceramic capacitors on the output.

Sleep Mode: Less than 1 µA quiescent current when ON/OFF pin is pulled low.

Smallest Possible Size: SOT-23 and micro SMD packages use absolute minimum board space.

Precision Output: 1% tolerance output voltages available (A grade).

Low Noise: By adding a 10 nF bypass capacitor, output noise can be reduced to 30 µV (typical).

Multiple voltage options, from 2.5V to 5.0V, are available as standard products. Consult factory for custom voltages.

Features

nUltra low dropout voltage

nGuaranteed 150 mA output current

nSmallest possible size (SOT-23, micro SMD package)

nRequires minimum external components

nStable with low-ESR output capacitor

n<1 µA quiescent current when shut down

nLow ground pin current at all loads

nOutput voltage accuracy 1% (A Grade)

nHigh peak current capability

nWide supply voltage range (16V max)

nLow ZOUT: 0.3Ω typical (10 Hz to 1 MHz)

nOvertemperature/overcurrent protection

n−40ÊC to +125ÊC junction temperature range

nCustom voltages available

Applications

nCellular Phone

nPalmtop/Laptop Computer

nPersonal Digital Assistant (PDA)

nCamcorder, Personal Stereo, Camera

Block Diagram

DS100140-1

VIP™ is a trademark of National Semiconductor Corporation.

Regulator Dropout-Low Ultra Noise-Low mA 150 Micropower LP2985

© 2000 National Semiconductor Corporation

DS100140

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LP2985

Basic Application Circuit

DS100140-2

*ON/OFF input must be actively terminated. Tie to VIN if this function is not to be used.

**Minimum capacitance is shown to ensure stability (may be increased without limit). Ceramic capacitor required for output (see Application Hints).

***Reduces output noise (may be omitted if application is not noise critical). Use ceramic or film type with very low leakage current (see Application Hints).

Connection Diagrams

5-Lead Small Outline Package (M5)

DS100140-3

Top View

See NS Package Number MF05A For ordering information see Table 1

micro SMD, 5 Bump Package (BPA05)

DS100140-44

Bottom View

See NS Package Number BPA05

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Ordering Information

TABLE 1. Package Marking and Ordering Information

	Output Voltage	Grade	Order Information	Package	Supplied as:
	(V)			Marking
	5-Lead Small Outline Package (M5)
	2.5	A	LP2985AIM5X-2.5	LAUA	3000 Units on Tape and Reel
	2.5	A	LP2985AIM5-2.5	LAUA	1000 Units on Tape and Reel
	2.5	STD	LP2985IM5X-2.5	LAUB	3000 Units on Tape and Reel
	2.5	STD	LP2985IM5-2.5	LAUB	1000 Units on Tape and Reel
	2.7	A	LP2985AIM5X-2.7	LALA	3000 Units on Tape and Reel
	2.7	A	LP2985AIM5-2.7	LALA	1000 Units on Tape and Reel
	2.7	STD	LP2985IM5X-2.7	LALB	3000 Units on Tape and Reel
	2.7	STD	LP2985IM5-2.7	LALB	1000 Units on Tape and Reel
	2.8	A	LP2985AIM5X-2.8	L0KA	3000 Units on Tape and Reel
	2.8	A	LP2985AIM5-2.8	L0KA	1000 Units on Tape and Reel
	2.8	STD	LP2985IM5X-2.8	L0KB	3000 Units on Tape and Reel
	2.8	STD	LP2985IM5-2.8	L0KB	1000 Units on Tape and Reel
	2.9	A	LP2985AIM5X-2.9	LAXA	3000 Units on Tape and Reel
	2.9	A	LP2985AIM5-2.9	LAXA	1000 Units on Tape and Reel
	2.9	STD	LP2985IM5X-2.9	LAXB	3000 Units on Tape and Reel
	2.9	STD	LP2985IM5-2.9	LAXB	1000 Units on Tape and Reel
	3.0	A	LP2985AIM5X-3.0	L0OA	3000 Units on Tape and Reel
	3.0	A	LP2985AIM5-3.0	L0OA	1000 Units on Tape and Reel
	3.0	STD	LP2985IM5X-3.0	L0OB	3000 Units on Tape and Reel
	3.0	STD	LP2985IM5-3.0	L0OB	1000 Units on Tape and Reel
	3.1	A	LP2985AIM5X-3.1	L0PA	3000 Units on Tape and Reel
	3.1	A	LP2985AIM5-3.1	L0PA	1000 Units on Tape and Reel
	3.1	STD	LP2985IM5X-3.1	L0PB	3000 Units on Tape and Reel
	3.1	STD	LP2985IM5-3.1	L0PB	1000 Units on Tape and Reel
	3.2	A	LP2985AIM5X-3.2	L0QA	3000 Units on Tape and Reel
	3.2	A	LP2985AIM5-3.2	L0QA	1000 Units on Tape and Reel
	3.2	STD	LP2985IM5X-3.2	L0QB	3000 Units on Tape and Reel
	3.2	STD	LP2985IM5-3.2	L0QB	1000 Units on Tape and Reel
	3.3	A	LP2985AIM5X-3.3	L0RA	3000 Units on Tape and Reel
	3.3	A	LP2985AIM5-3.3	L0RA	1000 Units on Tape and Reel
	3.3	STD	LP2985IM5X-3.3	L0RB	3000 Units on Tape and Reel
	3.3	STD	LP2985IM5-3.3	L0RB	1000 Units on Tape and Reel
	3.5	A	LP2985AIM5X-3.5	LAIA	3000 Units on Tape and Reel
	3.5	A	LP2985AIM5-3.5	LAIA	1000 Units on Tape and Reel
	3.5	STD	LP2985IM5X-3.5	LAIB	3000 Units on Tape and Reel
	3.5	STD	LP2985IM5-3.5	LAIB	1000 Units on Tape and Reel
	3.6	A	LP2985AIM5X-3.6	L0SA	3000 Units on Tape and Reel
	3.6	A	LP2985AIM5-3.6	L0SA	1000 Units on Tape and Reel
	3.6	STD	LP2985IM5X-3.6	L0SB	3000 Units on Tape and Reel
	3.6	STD	LP2985IM5-3.6	L0SB	1000 Units on Tape and Reel
	3.8	A	LP2985AIM5X-3.8	L0YA	3000 Units on Tape and Reel
	3.8	A	LP2985AIM5-3.8	L0YA	1000 Units on Tape and Reel
	3.8	STD	LP2985IM5X-3.8	L0YB	3000 Units on Tape and Reel
	3.8	STD	LP2985IM5-3.8	L0YB	1000 Units on Tape and Reel
	4.0	A	LP2985AIM5X-4.0	L0TA	3000 Units on Tape and Reel

LP2985

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LP2985

Ordering Information (Continued)

TABLE 1. Package Marking and Ordering Information (Continued)

	Output Voltage	Grade	Order Information	Package	Supplied as:
	(V)			Marking
	5-Lead Small Outline Package (M5)
	4.0	A	LP2985AIM5-4.0	L0TA	1000 Units on Tape and Reel
	4.0	STD	LP2985IM5X-4.0	L0TB	3000 Units on Tape and Reel
	4.0	STD	LP2985IM5-4.0	L0TB	1000 Units on Tape and Reel
	4.7	A	LP2985AIM5X-4.7	LAJA	3000 Units on Tape and Reel
	4.7	A	LP2985AIM5-4.7	LAJA	1000 Units on Tape and Reel
	4.7	STD	LP2985IM5X-4.7	LAJB	3000 Units on Tape and Reel
	4.7	STD	LP2985IM5-4.7	LAJB	1000 Units on Tape and Reel
	4.8	A	LP2985AIM5X-4.8	LAKA	3000 Units on Tape and Reel
	4.8	A	LP2985AIM5-4.8	LAKA	1000 Units on Tape and Reel
	4.8	STD	LP2985IM5X-4.8	LAKB	3000 Units on Tape and Reel
	4.8	STD	LP2985IM5-4.8	LAKB	1000 Units on Tape and Reel
	5.0	A	LP2985AIM5X-5.0	L0UA	3000 Units on Tape and Reel
	5.0	A	LP2985AIM5-5.0	L0UA	1000 Units on Tape and Reel
	5.0	STD	LP2985IM5X-5.0	L0UB	3000 Units on Tape and Reel
	5.0	STD	LP2985IM5-5.0	L0UB	1000 Units on Tape and Reel
	micro SMD, 5 Bump Package (BPA05)
	2.5	A	LP2985AIBP-2.5		250 Units on Tape and Reel
	2.5	A	LP2985AIBPX-2.5		3000 Units on Tape and Reel
	2.5	STD	LP2985IBP-2.5		250 Units on Tape and Reel
	2.5	STD	LP2985IBPX-2.5		3000 Units on Tape and Reel
	2.8	A	LP2985AIBP-2.8		250 Units on Tape and Reel
	2.8	A	LP2985AIBPX-2.8		3000 Units on Tape and Reel
	2.8	STD	LP2985IBP-2.8		250 Units on Tape and Reel
	2.8	STD	LP2985IBPX-2.8		3000 Units on Tape and Reel
	3.3	A	LP2985AIBP-3.3		250 Units on Tape and Reel
	3.3	A	LP2985AIBPX-3.3		3000 Units on Tape and Reel
	3.3	STD	LP2985IBPX-3.3		250 Units on Tape and Reel
	3.3	STD	LP2985IBPX-3.3		3000 Units on Tape and Reel

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Absolute Maximum Ratings (Note 1)

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

Storage Temperature Range	−65ÊC to +150ÊC
Operating Junction Temperature Range	−40ÊC to +125ÊC
Lead Temp. (Soldering, 5 sec.)	260ÊC
ESD Rating (Note 2)	2 kV
Power Dissipation (Note 3)	Internally Limited

Input Supply Voltage (Survival)	−0.3V to +16V
Input Supply Voltage (Operating)	2.5V to +16V
Shutdown Input Voltage (Survival)	−0.3V to +16V
Output Voltage (Survival, (Note 4))	−0.3V to +9V
IOUT (Survival)	Short Circuit
	Protected
Input-Output Voltage (Survival,	−0.3V to +16V
(Note 5))

Electrical Characteristics

Limits in standard typeface are for TJ = 25ÊC. and limits in boldface type apply over the full operating temperature range. Unless otherwise specified: VIN = VO(NOM) + 1V, IL = 1 mA, CIN = 1 µF, COUT = 4.7 µF, VON/OFF = 2V.

				LP2985AI-X.X		LP2985I-X.X
Symbol	Parameter	Conditions	Typ	(Note 6)		(Note 6)		Units
				Min	Max	Min	Max
VO	Output Voltage	IL = 1 mA		−1.0	1.0	−1.5	1.5
	Tolerance	1 mA ≤ IL ≤ 50 mA		−1.5	1.5	−2.5	2.5
				−2.5	2.5	−3.5	3.5	%VNOM
		1 mA ≤ IL ≤ 150 mA		−2.5	2.5	−3.0	3.0
				−3.5	3.5	−4.0	4.0
	Output Voltage	VO(NOM)+1V ≤ VIN ≤ 16V	0.007		0.014		0.014	%/V
	Line Regulation				0.032		0.032
VIN±VO	Dropout Voltage	IL = 0	1		3		3
	(Note 7)				5		5
		IL = 1 mA	7		10		10
					15		15
		IL = 10 mA	40		60		60	mV
					90		90
		IL = 50 mA	120		150		150
					225		225
		IL = 150 mA	280		350		350
					575		575
IGND	Ground Pin Current	IL = 0	65		95		95
					125		125
		IL = 1 mA	75		110		110
					170		170
		IL = 10 mA	120		220		220
					400		400	µA
		IL = 50 mA	350		600		600
					1000		1000
		IL = 150 mA	850		1500		1500
					2500		2500
		VON/OFF < 0.3V	0.01		0.8		0.8
		VON/OFF < 0.15V	0.05		2		2
VON/OFF	ON/OFF Input Voltage	High = O/P ON	1.4	1.6		1.6		V
	(Note 8)	Low = O/P OFF	0.55		0.15		0.15
ION/OFF	ON/OFF Input Current	VON/OFF = 0	0.01		−2		−2	µA
		VON/OFF = 5V	5		15		15
en	Output Noise	BW = 300 Hz to 50 kHz,
	Voltage (RMS)	COUT = 10 µF	30					µV
		CBYPASS = 10 nF

LP2985

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LP2985

Electrical Characteristics (Continued)

Limits in standard typeface are for TJ = 25ÊC. and limits in boldface type apply over the full operating temperature range. Unless otherwise specified: VIN = VO(NOM) + 1V, IL = 1 mA, CIN = 1 µF, COUT = 4.7 µF, VON/OFF = 2V.

				LP2985AI-X.X		LP2985I-X.X
Symbol	Parameter	Conditions	Typ	(Note 6)		(Note 6)		Units
				Min	Max	Min	Max
	Ripple Rejection	f = 1 kHz, CBYPASS = 10 nF	45					dB
		COUT = 10 µF
IO(SC)	Short Circuit Current	RL = 0 (Steady State)	400					mA
		(Note 9)
IO(PK)	Peak Output Current	VOUT ³ Vo(NOM) −5%	350					mA

Note 1: ªAbsolute Maximum Ratingsº indicate limits beyond which damage to the component may occur. Electrical specifications do not apply when operating the device outside of its rated operating conditions.

Note 2: The ESD rating of pins 3 and 4 is 1 kV.

Note 3: The maximum allowable power dissipation is a function of the maximum junction temperature, TJ(MAX), the junction-to-ambient thermal resistance, θJ-A, and the ambient temperature, TA. The maximum allowable power dissipation at any ambient temperture is calculated using:

Where the value of θJ-A for the SOT-23 package is 220ÊC/W in a typical PC board mounting and the micro SMD package is 320ÊC/W. Exceeding the maximum allowable dissipation will cause excessive die temperature, and the regulator will go into thermal shutdown.

Note 4: If used in a dual-supply system where the regulator load is returned to a negative supply, the LP2985 output must be diode-clamped to ground.

Note 5: The output PNP structure contains a diode between the VIN to VOUT terminals that is normally reverse-biased. Reversing the polarity from VIN to VOUT will turn on this diode.

Note 6: Limits are 100% production tested at 25ÊC. Limits over the operating temperature range are guaranteed through correlation using Statistical Quality Control (SQC) methods. The limits are used to calculate National's Average Outgoing Quality Level (AOQL).

Note 7: Dropout voltage is defined as the input to output differential at which the output voltage drops 100 mV below the value measured with a 1V differential.

Note 8: The ON/OFF input must be properly driven to prevent possible misoperation. For details, refer to Application Hints.

Note 9: The LP2985 has foldback current limiting which allows a high peak current when VOUT > 0.5V, and then reduces the maximum output current as VOUT is forced to ground (see Typical Performance Characteristics curves).

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