LP2985
Micropower 150 mA Low-Noise Ultra Low-Dropout
Regulator in SOT-23 and micro SMD Packages
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 bat-
tery powered applications.
Using an optimized VIP
TM
(Vertically Integrated PNP) pro-
cess, 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 A
@
150 mA load, and
75 A
@
1 mA load.
Enhanced Stability: The LP2985 is stable with output ca-
pacitor ESR as low as 5 m
, which allows the use of ceramic
capacitors on the output.
Sleep Mode: Less than 1 A 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 V (typical).
Multiple voltage options, from 2.5V to 5.0V, are available as
standard products. Consult factory for custom voltages.
Features
n
Ultra low dropout voltage
n
Guaranteed 150 mA output current
n
Smallest possible size (SOT-23, micro SMD package)
n
Requires minimum external components
n
Stable with low-ESR output capacitor
n
<
1 A quiescent current when shut down
n
Low ground pin current at all loads
n
Output voltage accuracy 1% (A Grade)
n
High peak current capability
n
Wide supply voltage range (16V max)
n
Low Z
OUT
: 0.3
typical (10 Hz to 1 MHz)
n
Overtemperature/overcurrent protection
n
-40C to +125C junction temperature range
n
Custom voltages available
Applications
n
Cellular Phone
n
Palmtop/Laptop Computer
n
Personal Digital Assistant (PDA)
n
Camcorder, Personal Stereo, Camera
Block Diagram
10014001
VIP
TM
is a trademark of National Semiconductor Corporation.
March 2004
LP2985
Micropower
150
mA
Low-Noise
Ultra
Low-Dropout
Regulator
in
SOT
-23
and
micro
SMD
Packages
2004 National Semiconductor Corporation
DS100140
www.national.com
Basic Application Circuit
10014002
*ON/OFF input must be actively terminated. Tie to V
IN
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)
micro SMD, 5 Bump Package (BPA05, TPA05 & BLA05)
10014003
Top View
See NS Package Number MF05A
For ordering information see Table 1
10014046
Note: The actual physical placement of the package marking will vary from
part to part. Package marking contains date code and lot traceability
information, and will vary considerably. Package marking does not correlate
to device type.
Top View
See NS Package Number BPA05, TPA05 & BLA05
Pin Descrption
Name
Pin Number
Function
SOT-23
micro SMD
V
IN
1
C3
Input Voltage
GND
2
A1
Common Ground (device substrate)
ON/OFF
3
A3
Logic high enable input
BYPASS
4
B2
Bypass capacitor for low noise operation
V
OUT
5
C1
Regulated output voltage
LP2985
www.national.com
2
Ordering Information
TABLE 1. Package Marking and Ordering Information
Output Voltage (V)
Grade
Order Information
Package
Marking
Supplied as:
5-Lead Small Outline Package (M5)
For output voltages
2.3V, refer to LP2985LV datasheet.
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
2.6
A
LP2985AIM5X-2.6
LCEA
3000 Units on Tape and Reel
2.6
A
LP2985AIM5-2.6
LCEA
1000 Units on Tape and Reel
2.6
STD
LP2985IM5X-2.6
LCEB
3000 Units on Tape and Reel
2.6
STD
LP2985IM5-2.6
LCEB
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
LP2985
www.national.com
3
Ordering Information
(Continued)
TABLE 1. Package Marking and Ordering Information (Continued)
Output Voltage (V)
Grade
Order Information
Package
Marking
Supplied as:
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
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
4.5
A
LP2985AIM5X-4.5
LA7A
3000 Units on Tape and Reel
4.5
A
LP2985AIM5-4.5
LA7A
1000 Units on Tape and Reel
4.5
STD
LP2985IM5X-4.5
LA7B
3000 Units on Tape and Reel
4.5
STD
LP2985IM5-4.5
LA7B
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
5.3
A
LP2985AIM5X-5.3
LFYA
3000 Units on Tape and Reel
5.3
A
LP2985AIM5-5.3
LFYA
1000 Units on Tape and Reel
5.3
STD
LP2985IM5X-5.3
LFYB
3000 Units on Tape and Reel
5.3
STD
LP2985IM5-5.3
LFYB
1000 Units on Tape and Reel
6.1
A
LP2985AIM5X-6.1
LF6A
3000 Units on Tape and Reel
6.1
A
LP2985AIM5-6.1
LF6A
1000 Units on Tape and Reel
6.1
STD
LP2985IM5X-6.1
LF6B
3000 Units on Tape and Reel
6.1
STD
LP2985IM5-6.1
LF6B
1000 Units on Tape and Reel
12
(Note 11)
A
LP2985AIM5X-12
LH1A
3000 Units on Tape and Reel
12
(Note 11)
A
LP2985AIM5-12
LH1A
1000 Units on Tape and Reel
12
(Note 11)
STD
LP2985IM5X-12
LH1B
3000 Units on Tape and Reel
12
(Note 11)
STD
LP2985IM5-12
LH1B
1000 Units on Tape and Reel
micro SMD, 5 Bump Package (BPA05 - 170 m ball)
2.4
A
LP2985AIBP-2.4
250 Units on Tape and Reel
2.4
A
LP2985AIBPX-2.4
3000 Units on Tape and Reel
2.4
STD
LP2985IBP-2.4
250 Units on Tape and Reel
2.4
STD
LP2985IBPX-2.4
3000 Units on Tape and Reel
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
LP2985
www.national.com
4
Ordering Information
(Continued)
TABLE 1. Package Marking and Ordering Information (Continued)
Output Voltage (V)
Grade
Order Information
Package
Marking
Supplied as:
2.6
A
LP2985AIBP-2.6
250 Units on Tape and Reel
2.6
A
LP2985AIBPX-2.6
3000 Units on Tape and Reel
2.6
STD
LP2985IBP-2.6
250 Units on Tape and Reel
2.6
STD
LP2985IBPX-2.6
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
2.9
A
LP2985AIBP-2.9
250 Units on Tape and Reel
2.9
A
LP2985AIBPX-2.9
3000 Units on Tape and Reel
2.9
STD
LP2985IBP-2.9
250 Units on Tape and Reel
2.9
STD
LP2985IBPX-2.9
3000 Units on Tape and Reel
3.0
A
LP2985AIBP-3.0
250 Units on Tape and Reel
3.0
A
LP2985AIBPX-3.0
3000 Units on Tape and Reel
3.0
STD
LP2985IBP-3.0
250 Units on Tape and Reel
3.0
STD
LP2985IBPX-3.0
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
3.6
A
LP2985AIBP-3.6
250 Units on Tape and Reel
3.6
A
LP2985AIBPX-3.6
3000 Units on Tape and Reel
3.6
STD
LP2985IBP-3.6
250 Units on Tape and Reel
3.6
STD
LP2985IBPX-3.6
3000 Units on Tape and Reel
4.0
A
LP2985AIBP-4.0
250 Units on Tape and Reel
4.0
A
LP2985AIBPX-4.0
3000 Units on Tape and Reel
4.0
STD
LP2985IBP-4.0
250 Units on Tape and Reel
4.0
STD
LP2985IBPX-4.0
3000 Units on Tape and Reel
5.0
A
LP2985AIBP-5.0
250 Units on Tape and Reel
5.0
A
LP2985AIBPX-5.0
3000 Units on Tape and Reel
5.0
STD
LP2985IBP-5.0
250 Units on Tape and Reel
5.0
STD
LP2985IBPX-5.0
3000 Units on Tape and Reel
micro SMD, 5 Bump Package (TPA05 - 170 m ball)
2.5
A
LP2985AITP-2.5
250 Units on Tape and Reel
2.5
A
LP2985AITPX-2.5
3000 Units on Tape and Reel
2.5
STD
LP2985ITP-2.5
250 Units on Tape and Reel
2.5
STD
LP2985ITPX-2.5
3000 Units on Tape and Reel
2.7
A
LP2985AITP-2.7
250 Units on Tape and Reel
2.7
A
LP2985AITPX-2.7
3000 Units on Tape and Reel
2.7
STD
LP2985ITP-2.7
250 Units on Tape and Reel
2.7
STD
LP2985ITPX-2.7
3000 Units on Tape and Reel
2.8
A
LP2985AITP-2.8
250 Units on Tape and Reel
2.8
A
LP2985AITPX-2.8
3000 Units on Tape and Reel
2.8
STD
LP2985ITP-2.8
250 Units on Tape and Reel
2.8
STD
LP2985ITPX-2.8
3000 Units on Tape and Reel
5.0
A
LP2985AITP-5.0
250 Units on Tape and Reel
5.0
A
LP2985AITPX-5.0
3000 Units on Tape and Reel
LP2985
www.national.com
5
PDF 
ZIP