National Semiconductor LP3996 Technical data

June 2007
LP3996 Dual Linear Regulator with 300mA and 150mA Outputs and Power-On-Reset
LP3996 Dual Linear Regulator with 300mA and 150mA Outputs and Power-On-Reset

General Description

The LP3996 is a dual low dropout regulator with power-on­reset circuit. The first regulator can source 150mA, while the second is capable of sourcing 300mA and has a power-on­reset function included.
The LP3996 provides 1.5% accuracy requiring an ultra low quiescent current of 35µA. Separate enable pins allow each output of the LP3996 to be shut down, drawing virtually zero current.
The LP3996 is designed to be stable with small footprint ce­ramic capacitors down to 1µF. An external capacitor may be used to set the POR delay time as required.
The LP3996 is available in fixed output voltages and comes in a 10 pin, 3mm x 3mm, LLP package. .

Features

2 LDO Outputs with Independent Enable
1.5% Accuracy at Room Temperature, 3% over
Temperature Power-On-Reset Function with Adjustable Delay
Thermal Shutdown Protection
Stable with Ceramic Capacitors

Typical Application Circuit

Key Specifications

Input Voltage Range 2.0V to 6.0V
Low Dropout Voltage 210mV at 300mA
Ultra-Low IQ (enabled) 35µA
Virtually Zero IQ (disabled) <10nA

Package

All available in Lead Free option.
10 pin LLP 3mm x 3mm
For other package options contact your NSC sales office.

Applications

Cellular Handsets
PDA's
Wireless Network Adaptors
20145801
© 2007 National Semiconductor Corporation 201458 www.national.com

Functional Block Diagram

LP3996
20145806

Pin Descriptions

Pin No Symbol Name and Function
1 V
2 EN1 Enable Input to Regulator 1. Active high input.
3 EN2 Enable Input to Regulator 2. Active high input.
4 C
5 SET Set Delay Input. Connect a capacitor between this pin and GND
6 GND Common Ground pin. Connect externally to exposed pad.
7 N/C No Connection. Do not connect to any other pin.
8 POR Power-On Reset Output. Open drain output. Active low indicates
9 V
10 V
Pad GND Common Ground. Connect to Pin 6.

LLP-10 Package

Voltage Supply Input. Connect a 1µF capacitor between this pin
IN
and GND.
High = On. Low = OFF.
High = On. Low = OFF.
Internal Voltage Reference Bypass. Connect a 10nF capacitor
BYP
from this pin to GND to reduce output noise and improve line transient and PSRR. This pin may be left open.
to set the POR delay time. If left open, there will be no delay.
under-voltage output on Regulator 2. A pull-up resistor is required for correct operation.
Output of Regulator 2. 300mA maximum current output. Connect
OUT2
a 1µF capacitor between this pin and GND.
Output of Regulator 1. 150mA maximum current output. Connect
OUT1
a 1µF capacitor between this pin and GND.
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Connection Diagram

LP3996
LLP-10 Package
See NS package number SDA10A
20145803
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Ordering Information (LLP-10)

LP3996
For other voltage options, please contact your local NSC sales office * These parts avaliable soon.
Output Voltage
(V)
0.8 / 3.3 LP3996SD-0833 NOPB L167B 1000 Units, Tape-and-Reel
LP3996SDX-0833 NOPB 4500 Units, Tape-and-Reel
LP3996SD-0833 1000 Units, Tape-and-Reel
LP3996SDX-0833 4500 Units, Tape-and-Reel
1.0 / 1.8 LP3996SD-1018 NOPB L227B 1000 Units, Tape-and-Reel
LP3996SDX-1018 NOPB 4500 Units, Tape-and-Reel
LP3996SD-1018 1000 Units, Tape-and-Reel
LP3996SDX-1018 4500 Units, Tape-and-Reel
1.5 / 2.5 LP3996SD-1525 NOPB L168B 1000 Units, Tape-and-Reel
LP3996SDX-1525 NOPB 4500 Units, Tape-and-Reel
LP3996SD-1525 1000 Units, Tape-and-Reel
LP3996SDX-1525 4500 Units, Tape-and-Reel
1.8 / 3.3 LP3996SD-1833 NOPB L228B 1000 Units, Tape-and-Reel
LP3996SDX-1833 NOPB 4500 Units, Tape-and-Reel
LP3996SD-1833 1000 Units, Tape-and-Reel
LP3996SDX-1833 4500 Units, Tape-and-Reel
2.5 / 3.3 LP3996SD-2533 NOPB L229B 1000 Units, Tape-and-Reel
LP3996SDX-2533 NOPB 4500 Units, Tape-and-Reel
LP3996SDX-2533 1000 Units, Tape-and-Reel
LP3996SD-2533 4500 Units, Tape-and-Reel
2.8 / 2.8 LP3996SD-2828 NOPB L171B 1000 Units, Tape-and-Reel
LP3996SDX-2828 NOPB 4500 Units, Tape-and-Reel
LP3996SD-2828 1000 Units, Tape-and-Reel
LP3996SDX-2828 4500 Units, Tape-and-Reel
3.0 / 3.0 LP3996SD-3030 NOPB L172B 1000 Units, Tape-and-Reel
LP3996SDX-3030 NOPB 4500 Units, Tape-and-Reel
LP3996SD-3030 1000 Units, Tape-and-Reel
LP3996SDX-3030 4500 Units, Tape-and-Reel
3.0 / 3.3 LP3996SD-3033 NOPB L170B 1000 Units, Tape-and-Reel
LP3996SDX-3033 NOPB 4500 Units, Tape-and-Reel
LP3996SD-3033 1000 Units, Tape-and-Reel
LP3996SDX-3033 4500 Units, Tape-and-Reel
3.3 / 0.8 LP3996SD-3308 NOPB L188B 1000 Units, Tape-and-Reel
LP3996SDX-3308 NOPB 4500 Units, Tape-and-Reel
LP3996SD-3308 1000 Units, Tape-and-Reel
LP3996SDX-3308 4500 Units, Tape-and-Reel
3.3 / 3.3 LP3996SD-3333 NOPB L173B 1000 Units, Tape-and-Reel
LP3996SDX-3333 NOPB 4500 Units, Tape-and-Reel
LP3996SD-3333 1000 Units, Tape-and-Reel
LP3996SDX-3333 4500 Units, Tape-and-Reel
Order Number Spec Package Marking
Supplied As
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LP3996

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 to GND -0.3V to 6.5V V
, V
OUT1
EN1 and EN2
OUT2
Voltage to GND POR to GND -0.3V to 6.5V Junction Temperature (T
J-MAX
Lead/Pad Temp. (Note 3) 235°C Storage Temperature -65°C to 150°C Continuous Power Dissipation
-0.3V to (VIN + 0.3V) with
)
6.5V (max)
150°C

Operating Ratings (Notes 1, 2)

Input Voltage 2.0V to 6.0V EN1, EN2, POR Voltage 0 to (VIN + 0.3V) to
6.0V (max) Junction Temperature -40°C to 125°C Ambient Temperature TARange
-40°C to 85°C
(Note 6)

Thermal Properties (Note 1)

Junction To Ambient Thermal Resistance(Note 7)
θJALLP-10 Package
55°C/W
Internally Limited(Note 4) ESD Rating(Note 5) Human Body Model 2.0kV Machine Model 200V

Electrical Characteristics (Notes 2, 8)

Unless otherwise noted, VEN = 950mV, VIN = V V
. CIN = 1 µF, I
OUT2
= 1 mA, C
OUT
OUT1
= C
OUT2
Typical values and limits appearing in normal type apply for TA = 25°C. Limits appearing in boldface type apply over the full junction temperature range for operation, −40 to +125°C.
Symbol Parameter Conditions Typ
V
ΔV
IN
OUT
Input Voltage (Note 9)
Output Voltage Tolerance I
Line Regulation Error VIN = (V
Load Regulation Error I
V
DO
Dropout Voltage (Note 10)
I
Q
I
SC
I
OUT
Quiescent Current LDO 1 ON, LDO 2 ON
Short Circuit Current Limit LDO 1 420 750
Maximum Output Current LDO 1 150
+ 1.0V, or 2.0V, whichever is higher, where V
OUT
is the higher of V
OUT
= 1.0µF.
Limit
Min Max
2 6
= 1mA
OUT
OUT(NOM)
= 1mA to 150mA
OUT
1.5V < V
V
OUT
+ 1.0V) to 6.0V
(LDO 1)
I
= 1mA to 300mA
OUT
(LDO 2)
I
= 1mA to 150mA
OUT
(LDO 1)
I
= 1mA to 300mA
OUT
(LDO 2)
I
= I
OUT2
= 0mA
OUT1
LDO 1 ON, LDO 2 OFF I
= 150mA
OUT1
LDO 1 OFF, LDO 2 ON I
= 300mA
OUT2
LDO 1 ON, LDO 2 ON I
OUT1
V
EN1
= 150mA, I
= V
= 0.4V
EN2
OUT2
= 300mA
OUT
1.5V
3.3V
0.03 0.3 %/V
85 155
26 85
110 220
210 550
35 100
45 110
45 110
70 170
0.5 10 nA
-2.5
-3.75
+2.5
+3.75
-2.75-4+2.75
LDO 2 550 840
LDO 2 300
+4
OUT1
and
Units
V
%
µV/mA
mV
µA
mA
mA
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Symbol Parameter Conditions Typ
LP3996
PSRR Power Supply Rejection Ratio
(Note 11)
e
n
T
SHUTDOWN
Output noise Voltage (Note 11) BW = 10Hz to
Thermal Shutdown Temperature 160
f = 1kHz, I
OUT
1mA to 150mA C
= 10nF
BYP
f = 20kHz, I
OUT
1mA to 150mA C
= 10nF
BYP
100kHz C
= 10nF
BYP
=
LDO1 58
LDO2
=
LDO1 45
LDO2 60
V
= 0.8V
OUT
V
= 3.3V
OUT
Hysteresis 20
Enable Control Characteristics
I
EN
Input Current at V
EN1
or V
EN2
VEN = 0.0V
VEN = 6V
V
IL
V
IH
Low Input Threshold at V V
EN2
High Input Threshold at V V
EN2
EN1
EN1
or
or
POR Output Characteristics
V
I
POR
V
TH
OL
Low Threshold % 0f V
High Threshold % 0f V
OUT2 (NOM)
OUT2 (NOM)
Flag ON
Flag OFF
Leakage Current Flag OFF, V
Flag Output Low Voltage I
SINK
= 250µA
POR
= 6.5V
Timing Characteristics
T
ON
Transient Response
Turn On Time (Note 11) To 95% Level
C
= 10nF
BYP
T
= T
= T
fall
fall
= 10µs
BYP
= 1µs LDO 1
Line Transient Response |δV (Note 11)
Load Transient Response |δV
OUT
OUT
|
rise
δVIN = 1VC
T
|
rise
(Note 11)
= 10nF
I
= 1mA to 150mA
OUT
LDO 2 I
= 1mA to 300mA
OUT
SET Input Characteristics
I
SET
V
TH(SET)
SET Pin Current Source V
SET
= 0V
SET Pin Threshold Voltage POR = High
Limit
Min Max
Units
70
dB
36
75
µV
°C
0.005 0.1
2 5
µA
0.4 V
0.95 V
88
96
30 nA
20 mV
300 µs
20
175
mV
(pk - pk)
150
1.3 µA
1.25 V
RMS
%
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