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

■

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© 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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