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LP2985 Micropower 150 mA Low-Noise Ultra Low-Dropout Regulator in SOT-23 and micro SMD
Packages
July 1, 2007
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 de-
signed 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 specifica-
tions 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 ca-
pacitor 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
■
■
■
■
■
■
■
■
■
■
■
■
■
■
Ultra low dropout voltage
Guaranteed 150 mA output current
Smallest possible size (SOT-23, micro SMD package)
Requires minimum external components
Stable with low-ESR output capacitor
<1 µA quiescent current when shut down
Low ground pin current at all loads
Output voltage accuracy 1% (A Grade)
High peak current capability
Wide supply voltage range (16V max)
Low Z
OUT
: 0.3Ω
typical (10 Hz to 1 MHz)
Overtemperature/overcurrent protection
−40°C to +125°C junction temperature range
Custom voltages available
Applications
■
■
■
■
Cellular Phone
Palmtop/Laptop Computer
Personal Digital Assistant (PDA)
Camcorder, Personal Stereo, Camera
Block Diagram
10014001
VIP
®
is a registered trademark of National Semiconductor Corporation.
© 2008 National Semiconductor Corporation
100140
www.national.com
LP2985
Basic Application Circuit
*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).
10014002
Connection Diagrams
5-Lead Small Outline Package (M5)
micro SMD, 5 Bump Package (BPA05, TPA05 & BLA05, &
TLA05)
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 & TLA05
Pin Descriptions
Name
SOT-23
V
IN
GND
ON/OFF
BYPASS
V
OUT
1
2
3
4
5
Pin Number
micro SMD
C3
A1
A3
B2
C1
Input Voltage
Common Ground (device substrate)
Logic high enable input
Bypass capacitor for low noise operation
Regulated output voltage
Function
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2
LP2985
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
2.5
2.5
2.5
2.6
2.6
2.6
2.6
2.7
2.7
2.7
2.7
2.8
2.8
2.8
2.8
2.9
2.9
2.9
2.9
3.0
3.0
3.0
3.0
3.1
3.1
3.1
3.1
3.2
3.2
3.2
3.2
3.3
3.3
3.3
3.3
3.5
3.5
3.5
3.5
3.6
3.6
3.6
3.6
A
A
STD
STD
A
A
STD
STD
A
A
STD
STD
A
A
STD
STD
A
A
STD
STD
A
A
STD
STD
A
A
STD
STD
A
A
STD
STD
A
A
STD
STD
A
A
STD
STD
A
A
STD
STD
LP2985AIM5X-2.5
LP2985AIM5-2.5
LP2985IM5X-2.5
LP2985IM5-2.5
LP2985AIM5X-2.6
LP2985AIM5-2.6
LP2985IM5X-2.6
LP2985IM5-2.6
LP2985AIM5X-2.7
LP2985AIM5-2.7
LP2985IM5X-2.7
LP2985IM5-2.7
LP2985AIM5X-2.8
LP2985AIM5-2.8
LP2985IM5X-2.8
LP2985IM5-2.8
LP2985AIM5X-2.9
LP2985AIM5-2.9
LP2985IM5X-2.9
LP2985IM5-2.9
LP2985AIM5X-3.0
LP2985AIM5-3.0
LP2985IM5X-3.0
LP2985IM5-3.0
LP2985AIM5X-3.1
LP2985AIM5-3.1
LP2985IM5X-3.1
LP2985IM5-3.1
LP2985AIM5X-3.2
LP2985AIM5-3.2
LP2985IM5X-3.2
LP2985IM5-3.2
LP2985AIM5X-3.3
LP2985AIM5-3.3
LP2985IM5X-3.3
LP2985IM5-3.3
LP2985AIM5X-3.5
LP2985AIM5-3.5
LP2985IM5X-3.5
LP2985IM5-3.5
LP2985AIM5X-3.6
LP2985AIM5-3.6
LP2985IM5X-3.6
LP2985IM5-3.6
LAUA
LAUA
LAUB
LAUB
LCEA
LCEA
LCEB
LCEB
LALA
LALA
LALB
LALB
L0KA
L0KA
L0KB
L0KB
LAXA
LAXA
LAXB
LAXB
L0OA
L0OA
L0OB
L0OB
L0PA
L0PA
L0PB
L0PB
L0QA
L0QA
L0QB
L0QB
L0RA
L0RA
L0RB
L0RB
LAIA
LAIA
LAIB
LAIB
L0SA
L0SA
L0SB
L0SB
3000 Units on Tape and Reel
1000 Units on Tape and Reel
3000 Units on Tape and Reel
1000 Units on Tape and Reel
3000 Units on Tape and Reel
1000 Units on Tape and Reel
3000 Units on Tape and Reel
1000 Units on Tape and Reel
3000 Units on Tape and Reel
1000 Units on Tape and Reel
3000 Units on Tape and Reel
1000 Units on Tape and Reel
3000 Units on Tape and Reel
1000 Units on Tape and Reel
3000 Units on Tape and Reel
1000 Units on Tape and Reel
3000 Units on Tape and Reel
1000 Units on Tape and Reel
3000 Units on Tape and Reel
1000 Units on Tape and Reel
3000 Units on Tape and Reel
1000 Units on Tape and Reel
3000 Units on Tape and Reel
1000 Units on Tape and Reel
3000 Units on Tape and Reel
1000 Units on Tape and Reel
3000 Units on Tape and Reel
1000 Units on Tape and Reel
3000 Units on Tape and Reel
1000 Units on Tape and Reel
3000 Units on Tape and Reel
1000 Units on Tape and Reel
3000 Units on Tape and Reel
1000 Units on Tape and Reel
3000 Units on Tape and Reel
1000 Units on Tape and Reel
3000 Units on Tape and Reel
1000 Units on Tape and Reel
3000 Units on Tape and Reel
1000 Units on Tape and Reel
3000 Units on Tape and Reel
1000 Units on Tape and Reel
3000 Units on Tape and Reel
1000 Units on Tape and Reel
3
www.national.com
LP2985
Output Voltage
(V)
3.8
3.8
3.8
3.8
4.0
4.0
4.0
4.0
4.5
4.5
4.5
4.5
4.7
4.7
4.7
4.7
4.8
4.8
4.8
4.8
5.0
5.0
5.0
5.0
5.3
5.3
5.3
5.3
5.7
5.7
5.7
5.7
6.1
6.1
6.1
6.1
12
(Note 11)
12
(Note 11)
12
(Note 11)
12
(Note 11)
2.4
2.4
2.4
2.4
2.5
www.national.com
Grade
A
A
STD
STD
A
A
STD
STD
A
A
STD
STD
A
A
STD
STD
A
A
STD
STD
A
A
STD
STD
A
A
STD
STD
A
A
STD
STD
A
A
STD
STD
A
A
STD
STD
Order Information
LP2985AIM5X-3.8
LP2985AIM5-3.8
LP2985IM5X-3.8
LP2985IM5-3.8
LP2985AIM5X-4.0
LP2985AIM5-4.0
LP2985IM5X-4.0
LP2985IM5-4.0
LP2985AIM5X-4.5
LP2985AIM5-4.5
LP2985IM5X-4.5
LP2985IM5-4.5
LP2985AIM5X-4.7
LP2985AIM5-4.7
LP2985IM5X-4.7
LP2985IM5-4.7
LP2985AIM5X-4.8
LP2985AIM5-4.8
LP2985IM5X-4.8
LP2985IM5-4.8
LP2985AIM5X-5.0
LP2985AIM5-5.0
LP2985IM5X-5.0
LP2985IM5-5.0
LP2985AIM5X-5.3
LP2985AIM5-5.3
LP2985IM5X-5.3
LP2985IM5-5.3
LP2985AIM5X-5.7
LP2985AIM5-5.7
LP2985IM5X-5.7
LP2985IM5-5.7
LP2985AIM5X-6.1
LP2985AIM5-6.1
LP2985IM5X-6.1
LP2985IM5-6.1
LP2985AIM5X-12
LP2985AIM5-12
LP2985IM5X-12
LP2985IM5-12
Package Marking
L0YA
L0YA
L0YB
L0YB
L0TA
L0TA
L0TB
L0TB
LA7A
LA7A
LA7B
LA7B
LAJA
LAJA
LAJB
LAJB
LAKA
LAKA
LAKB
LAKB
L0UA
L0UA
L0UB
L0UB
LFYA
LFYA
LFYB
LFYB
LKTA
LKTA
LKTB
LKTB
LF6A
LF6A
LF6B
LF6B
LH1A
LH1A
LH1B
LH1B
Supplied as:
3000 Units on Tape and Reel
1000 Units on Tape and Reel
3000 Units on Tape and Reel
1000 Units on Tape and Reel
3000 Units on Tape and Reel
1000 Units on Tape and Reel
3000 Units on Tape and Reel
1000 Units on Tape and Reel
3000 Units on Tape and Reel
1000 Units on Tape and Reel
3000 Units on Tape and Reel
1000 Units on Tape and Reel
3000 Units on Tape and Reel
1000 Units on Tape and Reel
3000 Units on Tape and Reel
1000 Units on Tape and Reel
3000 Units on Tape and Reel
1000 Units on Tape and Reel
3000 Units on Tape and Reel
1000 Units on Tape and Reel
3000 Units on Tape and Reel
1000 Units on Tape and Reel
3000 Units on Tape and Reel
1000 Units on Tape and Reel
3000 Units on Tape and Reel
1000 Units on Tape and Reel
3000 Units on Tape and Reel
1000 Units on Tape and Reel
3000 Units on Tape and Reel
1000 Units on Tape and Reel
3000 Units on Tape and Reel
1000 Units on Tape and Reel
3000 Units on Tape and Reel
1000 Units on Tape and Reel
3000 Units on Tape and Reel
1000 Units on Tape and Reel
3000 Units on Tape and Reel
1000 Units on Tape and Reel
3000 Units on Tape and Reel
1000 Units on Tape and Reel
micro SMD, 5 Bump Package (BPA05 - 170 µm ball)
A
A
STD
STD
A
LP2985AIBP-2.4
LP2985AIBPX-2.4
LP2985IBP-2.4
LP2985IBPX-2.4
LP2985AIBP-2.5
4
250 Units on Tape and Reel
3000 Units on Tape and Reel
250 Units on Tape and Reel
3000 Units on Tape and Reel
250 Units on Tape and Reel
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