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LP3988 Micropower, 150mA Ultra Low-Dropout CMOS Voltage Regulator With Power Good
August 2004
LP3988
Micropower, 150mA Ultra Low-Dropout CMOS Voltage
Regulator With Power Good
General Description
The LP3988 is a 150mA low dropout regulator designed
specially to meet requirements of Portable battery-
applications. The LP3988 is designed to work with a space
saving, small 1µF ceramic capacitor. The LP3988 features
an Error Flag output that indicates a faulty output condition.
The LP3988’s performance is optimized for battery powered
systems to deliver low noise, extremely low dropout voltage
and low quiescent current. Regulator ground current in-
creases only slightly in dropout, further prolonging the bat-
tery life.
Power supply rejection is better than 60 dB at low frequen-
cies 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 µA in disable
mode and has fast turn-on time less than 200µs.
The LP3988 is available 5 pin SOT-23 package and 5 bump
thin micro SMD package. Performance is specified for −40˚C
to +125˚C temperature range and is available in 1.85, 2.5,
2.6, 2.85, 3.0 and 3.3V output voltages.
n
n
n
n
n
n
40dB PSRR at 10kHz
≤1
µA quiescent current when shut down
Fast Turn-On time: 100 µs (typ.)
80 mV typ dropout with 150mA load
−40 to +125˚C junction temperature range for operation
1.85V, 2.5V, 2.6V, 2.85V, 3.0V, and 3.3V
Features
n
n
n
n
n
n
n
5 bump thin micro SMD package
SOT-23-5 package
Power-good flag output
Logic controlled enable
Stable with ceramic and high quality tantalum capacitors
Fast turn-on
Thermal shutdown and short-circuit current limit
Applications
n
n
n
n
n
CDMA cellular handsets
Wideband CDMA cellular handsets
GSM cellular handsets
Portable information appliances
Tiny 3.3V
±
5% to 2.85V, 150mA converter
Key Specifications
n
2.5 to 6.0V input range
n
150mA guaranteed output
Typical Application Circuit
20020502
© 2004 National Semiconductor Corporation
DS200205
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LP3988
Block Diagram
20020501
Pin Descriptions
Name
V
EN
GND
V
OUT
V
IN
Power Good
micro SMD
A1
B2
C1
C3
A3
SOT
3
2
5
1
4
Function
Enable Input Logic, Enable High
Common Ground
Output Voltage of the LDO
Input Voltage of the LDO
Power Good Flag (output):
open-drain output, connected to
an external pull-up resistor.
Active low indicates an output
voltage out of tolerance
condition.
Connection Diagrams
SOT-23-5 Package (MF)
5 Bump micro SMD Package (TLA)
20020507
Top View
See NS Package Number MF05A
20020530
Top View
See NS Package Number TLA05
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2
LP3988
Ordering Information
SOT23-5 Package
Output
Voltage (V)
2.5
2.6
2.85
3.0
3.3
Grade
STD
STD
STD
STD
STD
LP3988 Supplied as 1000
Units, Tape and Reel
LP3988IMF-2.5
LP3988IMF-2.6
LP3988IMF-2.85
LP3988IMF-3.0
LP3988IMF-3.3
LP3988 Supplied as 3000
Units, Tape and Reel
LP3988IMFX-2.5
LP3988IMFX-2.6
LP3988IMFX-2.85
LP3988IMFX-3.0
LP3988IMFX-3.3
Package Marking
LFSB
LDJB
LDLB
LFAB
LH5B
5 Bump Thin Micro SMD Package
Output
Voltage (V)
1.85
2.6
2.85
Grade
STD
STD
STD
LP3988 Supplied as 250
Units, Tape and Reel
LP3988ITL-1.85
LP3988ITL-2.6
LP3988ITL-2.85
LP3988 Supplied as 3000
Units, Tape and Reel
LP3988ITLX-1.85
LP3988ITLX-2.6
LP3988ITLX-2.85
3
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LP3988
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.
V
IN
V
OUT
, V
EN
, PowerGood(applies
only to micro SMD)
Junction Temperature
Storage Temperature
Lead Temp, Pad Temp.
Power Dissipation (Note 3)
SOT23-5
micro SMD
−0.3 to 6.5V
−0.3V to (V
IN
+0.3V),
with 6V max
150˚C
−65˚C to +150˚C
235˚C
364mW
355mW
ESD Rating (Note 4)
Human Body Model
Machine Model
SOT23-5 (Note 13)
micro SMD
150V
200V
2kV
Operating Ratings
(Notes 1, 2)
V
IN
(Note 15)
V
OUT
, V
EN
Junction Temperature
Junction-to-Ambient Thermal
Resistance (θ
JA
)
SOT23-5
micro SMD
Maximum Power Dissipation (Note 5)
SOT23-5
micro SMD
2.5V to 6V
0 to V
IN
−40˚C to +125˚C
220
o
C/W
255
o
C/W
250mW
244mW
Electrical Characteristics
Unless otherwise specified: V
EN
= 1.8V, V
IN
= V
OUT
+ 0.5V, C
IN
= 1 µF, I
OUT
= 1mA, C
OUT
= 1 µF. Typical values and limits
appearing in standard typeface are for T
J
= 25˚C. Limits appearing in
boldface type
apply over the entire junction temperature
range for operation, −40˚C to +125˚C. (Note 6) (Note 7)
Symbol
Parameter
Output Voltage
Tolerance
Conditions
Typ
Limit
Min
−2
−3
−3.5
-3
−0.15
−0.2
Max
2
3
3.5
3
0.15
0.2
0.005
0.007
65
%/V
%/mA
Units
−20˚C
%
T
J
%
125˚C, SOT23-5
−40˚C
%
T
J
%
125˚C, SOT23-5
−40˚C
%
T
J
%
125˚C, micro SMD
% of
V
OUT(nom)
∆V
OUT
Line Regulation Error
Load Regulation Error
(Note 8)
V
IN
= V
OUT
(NOM)
+ 0.5V to 6.0V
I
OUT
= 1 mA to 150 mA
V
IN
= V
OUT(nom)
+ 1V,
f = 1 kHz,
I
OUT
= 50 mA (Figure
3)
V
IN
= V
OUT(nom)
+ 1V,
f = 10 kHz,
I
OUT
= 50 mA (Figure
3)
V
EN
= 1.4V, I
OUT
= 0 mA
V
EN
= 1.4V, I
OUT
= 0 to 150 mA
V
EN
= 0.4V
PSRR
Power Supply Rejection Ratio
45
dB
I
Q
Quiescent Current
85
140
0.003
1
80
600
220
1
5
160
20
120
200
1.0
5
115
150
mV
mA
µVrms
20
500
µF
mΩ
˚C
˚C
0.1
µA
µA
Dropout Voltage (Note 9)
I
OUT
= 1 mA
I
OUT
= 150 mA
I
SC
e
n
Short Circuit Current Limit
Output Noise Voltage
Output Capacitor
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
Maximum Input Current at EN
(Note 10)
BW = 10 Hz to 100 kHz,
C
OUT
= 1µF
Capacitance (Note 11)
ESR (Note 11)
C
OUT
TSD
Enable Control Characteristics (Note 12)
I
EN
V
EN
= 0 and V
IN
= 6.0V
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