NSC LP3986TL-3333, LP3986TL-2929, LP3986TL-285285, LP3986TL-2828, LP3986BLX285285 Datasheet
...
LP3986
Dual Micropower 150 mA Ultra Low-Dropout CMOS
Voltage Regulators in micro SMD Package
General Description
The LP3986 is a 150 mA dual low dropout regulator designed for portable and wireless applications with demanding performance and board space requirements.
The LP3986 is stable with a small 1 µF
±
30% ceramic output
capacitor requiring smallest possible board space.
The LP3986’s performance is optimized for battery powered
systems to deliver ultra low noise, extremely low dropout
voltage and low quiescent current independent of load current. Regulator ground current increases very slightly in
dropout, further prolonging the battery life. Optional external
bypass capacitor reduces the output noise further without
slowing down the load transient response. Fast start-up time
is achieved by utilizing a speed-up circuit that actively precharges the bypass capacitor. Power supply rejection is
better than 60 dB at low frequencies and 55 dB at 10 kHz.
High power supply rejection is maintained at low input voltage levels common to battery operated circuits.
The LP3986 is available in a micro SMD package. Performance is specified for a −40˚C to +125˚C temperature
range. For single LDO applications, please refer to the
LP3985 datasheet.
Features
n Miniature 8-I/O micro SMD package
n Stable with 1µF ceramic and high quality tantalum
output capacitors
n Fast turn-on
n Two independent regulators
n Logic controlled enable
n Over current and thermal protection
Key Specifications
n Guaranteed 150 mA output current per regulator
n 1nA typical quiescent current when both regulators in
shutdown mode
n 60 mV typical dropout voltage at 150 mA output current
n 115 µA typical ground current
n 40 µV typical output noise
n 200 µs fast turn-on circuit
n −40˚C to +125˚C junction temperature
Applications
n CDMA cellular handsets
n GSM cellular handsets
n Portable information appliances
n Portable battery applications
Typical Application Circuit
20003401
May 2003
LP3986 Dual Micropower 150 mA Ultra Low-Dropout CMOS Voltage Regulators in micro SMD
Package
© 2003 National Semiconductor Corporation DS200034 www.national.com
Block Diagram
LP3986
20003402
Pin Description
Name *micro SMD Function
V
OUT2
A1 Output Voltage of the second LDO
EN
2
B1 Enable input for the second LDO
BYPASS C1 Bypass capacitor for the bandgap
GND C2 Common ground
GND C3 Common ground
EN
1
B3 Enable input for the first LDO
V
OUT1
A3 Output Voltage of the first LDO
V
IN
A2 Common input for both LDOs
* Note: The pin numbering scheme for the micro SMD package was revised in April 2002 to conform to JEDEC standard. Only the pin
numbers were revised. No changes to the physical location of the inputs/outputs were made. For reference purposes, the obsolete
numbering scheme had V
OUT2
as pin 1, EN2as pin 2, BYPASS as pin 3, GND as pins 4 and 5, EN1as pin 6, V
OUT1
as pin 7, and V
IN
as pin 8.
Connection Diagram
20003404
Top View
8 Bump micro SMD Package
See NS Package Number BLA08
LP3986
www.national.com 2
Ordering Information
For micro SMD Package (BL has thickness of 0.995mm)
Output
Voltage (V)
Grade
Package
Marking
LP3986 Supplied as 250 Units,
Tape and Reel
LP3986 Supplied as 3000
Units, Tape and Reel
2.52.8 STD 14 LP3986BL-2528 LP3986BLX-2528
2.82.8 STD 10 LP3986BL-2828 LP3986BLX-2828
2.852.85 STD 11 LP3986BL-285285 LP3986BLX285285
2.92.9 STD 15 LP3986BL-2929 LP3986BLX-2929
3.03.0 STD 12 LP3986BL-3030 LP3986BLX-3030
3.13.1 STD 13 LP3986BL-3131 LP3986BLX-3131
3.13.3 STD 16 LP3986BL-3133 LP3986BLX-3133
3.33.3 STD 17 LP3986BL-3333 LP3986BLX-3333
For micro SMD Package (TL has thickness of 0.600mm)
Output
Voltage (V)
Grade
Package
Marking
LP3986 Supplied as 250 Units,
Tape and Reel
LP3986 Supplied as 3000
Units, Tape and Reel
2.52.8 STD 14 LP3986TL-2528 LP3986TLX-2528
2.82.8 STD 10 LP3986TL-2828 LP3986TLX-2828
2.852.85 STD 11 LP3986TL-285285 LP3986TLX285285
2.92.9 STD 15 LP3986TL-2929 LP3986TLX-2929
3.03.0 STD 12 LP3986TL-3030 LP3986TLX-3030
3.13.1 STD 13 LP3986TL-3131 LP3986TLX-3131
3.13.3 STD 16 LP3986TL-3133 LP3986TLX-3133
3.33.3 STD 17 LP3986TL-3333 LP3986TLX-3333
20003403
LP3986
www.national.com3
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,VEN
−0.3 to 6.5V
V
OUT
−0.3 to (VIN+0.3V) ≤ 6.5V
Junction Temperature 150˚C
Storage Temperature −65˚C to +150˚C
Pad Temp. (Note 3) 235˚C
Maximum Power Dissipation
(Note 4) 364mW
ESD Rating (Note 5)
Human Body Model
Machine Model
2kV
200V
Operating Ratings (Notes 1, 2)
V
IN
2.5 to 6V
V
EN
0to(VIN+ 0.3V) ≤ 6V
Junction Temperature −40˚C to +125˚C
Thermal Resistance
θ
JA
220˚C/W
Maximum Power Dissipation (Note 6) 250mW
Electrical Characteristics
Unless otherwise specified: VIN=V
OUT(nom)
+ 0.5V, CIN= 1 µF, I
OUT
= 1mA, C
OUT
= 1 µF, C
BYPASS
= 0.01µF. 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 7) (Note 8)
Symbol Parameter Conditions Typ
Limit
Units
Min Max
∆V
OUT
Output Voltage
Tolerance
I
OUT
= 1mA −2.5
−3.0
2.5
3.0
%of
V
OUT(nom)
Line Regulation Error
(Note 9)
VIN=(V
OUT(nom)
+ 0.5V) to
6.0V,
I
OUT
=1mA
0.006 0.092
0.128 %/V
Load Regulation Error
(Note 10)
I
OUT
= 1mA to 150 mA 0.003 0.006
0.01
%/mA
Output AC Line
Regulation
VIN=V
OUT(nom)
+ 1V,
I
OUT
= 150 mA (Figure 1)
1.5
mV
P-P
PSRR
Power Supply Rejection
Ratio
V
IN
= 3.1V,
f = 1 kHz,
I
OUT
=50mA(Figure 2)
60
dB
V
IN
= 3.1V,
f = 10 kHz,
I
OUT
=50mA(Figure 2)
50
I
Q
Quiescent Current Both Regulators ON
V
EN
= 1.4V, I
OUT
=0mA
115 200
µA
Both Regulators ON
V
EN
= 1.4V, I
OUT
= 0 to 150
mA
220 320
One Regulator ON
V
EN
= 1.4V I
OUT
=0mA
75 130
One Regulator ON
VEN= 1.4V I
OUT
= 0 to 150
mA
130 200
V
EN
= 0.4V, Both Regulators
OFF (shutdown)
0.001 2
4
Dropout Voltage
(Note 11)
I
OUT
=1mA
I
OUT
= 150 mA
0.4
60
2
100
mV
I
SC
Short Circuit Current
Limit
Output Grounded 600
mA
I
OUT(PK)
Peak Output Current V
OUT
≥ V
OUT(nom)
- 5% 500 300 mA
T
ON
Turn-On Time
(Note 12)
C
BYPASS
= 0.01 µF 200
µs
LP3986
www.national.com 4
Loading...