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LP3999 Low Noise 150mA Voltage Regulator for RF/Analog Applications
July 2006
LP3999
Low Noise 150mA Voltage Regulator for RF/Analog
Applications
General Description
The LP3999 regulator is designed to meet the requirements
of portable wireless battery-powered applications and will
provide an accurate output voltage with low noise and low
quiescent current. Ideally suited for powering RF/Analog
devices this device will also be used to meet more general
circuit requirements.
For battery powered applications the low dropout and low
ground current provided by the device allows the lifetime of
the battery to be maximized.The inclusion of an Enable(dis-
able) control can be used by the system to further extend the
battery lifetime by reducing the power consumption to virtu-
ally zero. Should the application require a device with an
active disable function please refer to device LP3995.
The LP3999 also features internal protection against short-
circuit currents and over-temperature conditions.
The LP3999 is designed to be stable with small 1.0 µF
ceramic capacitors. The small outline of the LP3999 micro
SMD package with the required ceramic capacitors can
realize a system application within minimal board area.
Performance is specified for a −40˚C to +125˚C temperature
range.
The device is available in micro SMD package. For other
package options contact your local NSC sales office.
The device is available in fixed output voltages in the ranges
of 1.5V to 3.3V. For availability, please contact your local
NSC sales office.
Key Specifications
n
n
n
n
n
n
n
n
2.5V to 6.0V Input Range
Accurate Output Voltage;
±
75mV / 2%
60 mV Typical Dropout with 150 mA Load. V
out
>
2.5V
Virtually Zero Quiescent Current when Disabled
10 µVrms output noise over 10Hz to 100kHz
Stable with a 1 µF Output Capacitor
Guaranteed 150 mA Output Current
Fast Turn-on Time; 140 µs (Typ.)
Features
n
n
n
n
n
n
5 pin micro SMD Package
Stable with Ceramic Capacitor
Logic Controlled Enable
Fast Turn-on
Thermal-overload and short-circuit protection
−40 to +125˚C junction temperature range for operation
Applications
n
n
n
n
n
n
GSM Portable Phones
CDMA Cellular Handsets
Wideband CDMA Cellular Handsets
Bluetooth Devices
Portable Information Appliances
Handheld MP3 Devices
Typical Application Circuit
20052001
© 2006 National Semiconductor Corporation
DS200520
www.national.com
LP3999
Block Diagram
20052002
Pin Descriptions
Package 5–pin microSMD
Pin No.
A1
B2
C1
C3
A3
Symbol
V
EN
GND
V
OUT
V
IN
C
BYPASS
Name and Function
Enable Input; Disables the Regulator when
≤
0.4V.
Enables the regulator when
≥
0.9V
Common Ground
Voltage output. Connect this output to the load circuit.
Voltage Supply Input
Bypass Capacitor connection.
Connect a 0.01 µF capacitor for noise reduction.
Connection Diagram
micro SMD, 5 Bump Package
20052003
See NS Package Number TLA05
www.national.com
2
LP3999
Ordering Information
For micro SMD Package
Output Voltage
(V)
1.5
1.8
1.875
2.4
2.5
2.8
3.3
Grade
LP3999 Supplied as 250
Units, Tape and Reel
LP3999ITL-1.5
LP3999ITL-1.8
LP3999ITL-1.875
LP3999ITL-2.4
LP3999ITL-2.5
LP3999ITL-2.8
LP3999ITL-3.3
For micro SMD Package UNLEADED
Output Voltage
(V)
1.5
1.8
1.875
2.4
2.5
2.8
3.3
Grade
LP3999 Supplied as 250
Units, Tape and Reel
LP3999ITL-1.5 NOPB
LP3999ITL-1.8 NOPB
LP3999ITL-1.875 NOPB
LP3999ITL-2.4 NOPB
LP3999ITL-2.5 NOPB
LP3999ITL-2.8 NOPB
LP3999ITL-3.3 NOPB
LP3999 Supplied as
3000 Units, Tape and
Reel
LP3999ITLX-1.5 NOPB
LP3999ITLX-1.8 NOPB
LP3999ITLX-1.875 NOPB
LP3999ITLX-2.4 NOPB
LP3999ITLX-2.5 NOPB
LP3999ITLX-2.8 NOPB
LP3999ITLX-3.3 NOPB
Package
Marking
LP3999 Supplied as
3000 Units, Tape and
Reel
LP3999ITLX-1.5
LP3999ITLX-1.8
LP3999ITLX-1.875
LP3999ITLX-2.4
LP3999ITLX-2.5
LP3999ITLX-2.8
LP3999ITLX-3.3
Package
Marking
STD
STD
STD
STD
STD
STD
STD
STD
STD
STD
STD
STD
STD
STD
3
www.national.com
LP3999
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.
Input Voltage (V
IN
)
Output Voltage
Enable Input Voltage
Junction Temperature
Lead/Pad Temperature
(Note 3)
microSMD
Storage Temperature
Continuous Power Dissipation
(Note 4)
ESD (Note 7)
260˚C
−65 to +150˚C
Internally limited
−0.3 to 6.5V
−0.3 to (V
IN
+ 0.3V)
to 6.5V (max)
−0.3 to 6.5V
150˚C
Human Body Model
Machine Model
2 kV
200V
Operating Ratings
(Note 1)
Input Voltage (V
IN
)
Enable Input Voltage
Junction Temperature
Ambient Temperature Range
(Note 5)
2.5 to 6.0V
0 to 6.0V
−40 to +125˚C
-40 to 85˚C
Thermal Properties
(Note 6)
Junction to Ambient Thermal
Resistance
θ
JA
(micro SMD pkg.)
255˚C/W
Electrical Characteristics
Unless otherwise noted, V
EN
= 1.5, V
IN
= V
OUT(NOM)
+ 1.0V, C
IN
= 1 µF, I
OUT
= 1 mA, C
OUT
= 1 µF, C
BP
= 0.01 µF. Typical
values and limits appearing in normal type apply for T
J
= 25˚C. Limits appearing in
boldface
type apply over the full tempera-
ture range for operation, −40 to +125˚C. (Notes 11, 12)
Symbol
V
IN
∆V
OUT
Parameter
Input Voltage
Output Voltage Tolerance
Line Regulation Error
Load Regulation Error
PSRR
Power Supply Rejection Ratio
(Note 9)
Output Voltage Tolerance
Line Regulation Error
Load Regulation Error
PSRR
Power Supply Rejection Ratio
(Note 9)
Output Voltage Tolerance
Line Regulation Error
Load Regulation Error
V
DO
PSRR
Dropout Voltage
Power Supply Rejection Ratio
(Note 9)
Load Current
I
OUT
= 1 mA
V
IN
= (V
OUT(NOM)
+1.0V) to 6.0V,
I
OUT
= 1 mA
I
OUT
= 1 mA to 150 mA
f = 1 kHz, I
OUT
= 1 mA
f = 10 kHz, I
OUT
= 1 mA
I
OUT
= 1 mA
V
IN
= (V
OUT(NOM)
+1.0V) to 6.0V,
I
OUT
= 1 mA
I
OUT
= 1 mA to 150 mA
f = 1 kHz, I
OUT
= 1 mA
f = 10 kHz, I
OUT
= 1 mA
I
OUT
= 1 mA
V
IN
= (V
OUT(NOM)
+1.0V) to 6.0V,
I
OUT
= 1 mA
I
OUT
= 1 mA to 150 mA
I
OUT
= 1 mA
I
OUT
= 150 mA
f = 1 kHz, I
OUT
= 1 mA
f = 10 kHz, I
OUT
= 1 mA
(Notes 8, 9)
4
Conditions
Typical
Limit
Min
2.5
−50
-75
−3.5
Max
6.0
50
75
3.5
75
Units
V
DEVICE OUTPUT: 1.5
≤
V
OUT
<
1.8V
mV
mV/V
µV/mA
dB
10
58
58
-50
−75
−2.5
10
60
60
-2
−3
−0.1
0.0004
0.4
60
60
50
0
DEVICE OUTPUT: 1.8
≤
V
OUT
<
2.5V
∆V
OUT
50
75
2.5
75
mV
mV/V
µV/mA
dB
DEVICE OUTPUT: 2.5
≤
V
OUT
≤
3.3V
∆V
OUT
2
3
0.1
0.002
2
100
% of
V
OUT(NOM)
%/V
%/mA
mV
dB
FULL V
OUT
RANGE
I
LOAD
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