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 Range2.0V to 6.0V
■
Low Dropout Voltage210mV 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.
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 Voltage2.0V to 6.0V
EN1, EN2, POR Voltage0 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 Model2.0kV
Machine Model200V
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.
SymbolParameterConditionsTyp
V
ΔV
IN
OUT
Input Voltage(Note 9)
Output Voltage ToleranceI
Line Regulation ErrorVIN = (V
Load Regulation ErrorI
V
DO
Dropout Voltage
(Note 10)
I
Q
I
SC
I
OUT
Quiescent CurrentLDO 1 ON, LDO 2 ON
Short Circuit Current LimitLDO 1420750
Maximum Output CurrentLDO 1150
+ 1.0V, or 2.0V, whichever is higher, where V
OUT
is the higher of V
OUT
= 1.0µF.
Limit
MinMax
26
= 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
0.030.3%/V
85155
2685
110220
210550
35100
45110
45110
70170
0.510nA
-2.5
-3.75
+2.5
+3.75
-2.75-4+2.75
LDO 2550840
LDO 2300
+4
OUT1
and
Units
V
%
µV/mA
mV
µA
mA
mA
5www.national.com
SymbolParameterConditionsTyp
LP3996
PSRRPower Supply Rejection Ratio
(Note 11)
e
n
T
SHUTDOWN
Output noise Voltage (Note 11)BW = 10Hz to
Thermal ShutdownTemperature160
f = 1kHz, I
OUT
1mA to 150mA
C
= 10nF
BYP
f = 20kHz, I
OUT
1mA to 150mA
C
= 10nF
BYP
100kHz
C
= 10nF
BYP
=
LDO158
LDO2
=
LDO145
LDO260
V
= 0.8V
OUT
V
= 3.3V
OUT
Hysteresis20
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 CurrentFlag OFF, V
Flag Output Low VoltageI
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 SourceV
SET
= 0V
SET Pin Threshold VoltagePOR = High
Limit
MinMax
Units
70
dB
36
75
µV
°C
0.0050.1
25
µA
0.4V
0.95V
88
96
30nA
20mV
300µs
20
175
mV
(pk - pk)
150
1.3µA
1.25V
RMS
%
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