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LP2966IMMX-2830
Datasheet
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NSC LP2966IMMX-2830 Datasheet

LP2966 Dual 150mA Ultra Low-Dropout Regulator
LP2966 Dual 150mA Ultra Low-Dropout Regulator
May 2001

General Description

The LP2966 dual ultra low-dropout (LDO) regulator operates from a +2.70V to +7.0V input supply. Each output delivers 150mA over full temperature range. The IC operates with extremely low drop-out voltage and quiescent current, which makes it very suitable for battery powered and portable applications. Each LDO in the LP2966 has independent shutdown capability. The LP2966 provides low noise perfor­mance with low ground pin current in an extremely small MSOP-8 package (refertopackagedimensions and connec­tion diagram for more information on MSOP-8 package). A wide range of preset voltage options are available for each output. In addition to the voltage combinations listed in the ordering information table, many more are available upon request with minimum orders. In all, 256 voltage combina­tions are possible.

Key Specifications

Dropout Voltage: Varies linearly with load current. Typically
Ground Pin Current: Typically 300µA at 1mA load current and 340µA at 100mA load current (with one shutdown pin pulled low).
Shutdown Mode: Less than 1µA quiescent current when both shutdown pins are pulled low.
Precision Output Voltage: Multiple output voltage options available ranging from 1.8V to 5.0V with a guaranteed accu-
±
racy of
1% at room temperature.

Features

n Ultra low drop-out voltage n Low ground pin current
<
n
1µA quiescent current in shutdown mode
n Independent shutdown of each LDO regulator n Output voltage accuracy n Guaranteed 150mA output current at each output n Low output noise n Error Flags indicate status of each output n Available in MSOP-8 surface mount packages n Low output capacitor requirements (1µF) n Operates with Low ESR ceramic capacitors in most

applications

n Over temperature/over current protection n -40˚C to +125˚C junction temperature range
±
1%
Applications
n Cellular and Wireless Applications n Palmtop/Laptop Computer n GPS systems n Flat panel displays n Post regulators n USB applications n Hand held equipment and multimeters n Wireless data terminals n Other battery powered applications

Typical Application Circuit

*SD1 and SD2 must be actively terminated through a pull up resistor. Tie to VINif not used. **ERROR1 and ERROR2 are open drain outputs. These pins must be connected to ground if not used. # Minimum output capacitance is 1µF to insure stability over full load current range. More capacitance improves superior dynamic performance and provides additional stability margin.
© 2001 National Semiconductor Corporation DS100850 www.national.com
10085030

Block Diagram

LP2966

Connection Diagram

10085031
10085032
Top View
Mini SO-8 Package
8-Lead Small Outline Integrated Circuit (SOIC)
Package Code: MSOP-8
www.national.com 2

Pin Description

Pin Name Function
1 VIN Input Supply pin 2 SD1 3 SD2 4 GND Ground 5 ERROR2
6 ERROR1
7 VOUT2 Output 2 8 VOUT1 Output 1
Active low shutdown pin for output 1 Active low shutdown pin for output 2
Error flag for output 2 - Normally high impedance, should be connected to ground if not used.
Error flag for output 1 - Normally high impedance, should be connected to ground if not used.

TABLE 1. Ordering Information

The following voltage options and their combinations are possible.
5.0V, 4.0V, 3.8V, 3.6V, 3.3V, 3.2V, 3.1V, 3.0V, 2.9V, 2.8V, 2.7V, 2.6V, 2.5V, 2.4V, 2.0V and 1.8V
Output Voltage 1 Output Voltage 2 Order Number Package Marking Supplied As:
5.0 5.0 LP2966IMM-5050 LAFB 1000 units on tape and reel
5.0 5.0 LP2966IMMX-5050 LAFB 3500 units on tape and reel
3.6 3.6 LP2966IMM-3636 LAEB 1000 units on tape and reel
3.6 3.6 LP2966IMMX-3636 LAEB 3500 units on tape and reel
3.3 3.6 LP2966IMM-3336 LAHB 1000 units on tape and reel
3.3 3.6 LP2966IMMX-3336 LAHB 3500 units on tape and reel
3.3 3.3 LP2966IMM-3333 LADB 1000 units on tape and reel
3.3 3.3 LP2966IMMX-3333 LADB 3500 units on tape and reel
3.3 2.5 LP2966IMM-3325 LARB 1000 units on tape and reel
3.3 2.5 LP2966IMMX-3325 LARB 3500 units on tape and reel
3.0 3.0 LP2966IMM-3030 LACB 1000 units on tape and reel
3.0 3.0 LP2966IMMX-3030 LACB 3500 units on tape and reel
2.8 3.0 LP2966IMM-2830 LASB 1000 units on tape and reel
2.8 3.0 LP2966IMMX-2830 LASB 3500 units on tape and reel
2.8 2.8 LP2966IMM-2828 LABB 1000 units on tape and reel
2.8 2.8 LP2966IMMX-2828 LABB 3500 units on tape and reel
2.5 2.5 LP2966IMM-2525 LAAB 1000 units on tape and reel
2.5 2.5 LP2966IMMX-2525 LAAB 3500 units on tape and reel
1.8 3.3 LP2966IMM-1833 LCFB 1000 units on tape and reel
1.8 3.3 LP2966IMMX-1833 LCFB 3500 units on Tape and reel
1.8 3.0 LP2966IMM-1830 LEYB 1000 units on tape and reel
1.8 3.0 LP2966IMMX-1830 LEYB 3500 units on Tape and reel
1.8 1.8 LP2966IMM-1818 LA9B 1000 units on tape and reel
1.8 1.8 LP2966IMMX-1818 LA9B 3500 units on tape and reel
LP2966
The voltage options and combinations shown in tions of voltage options, please contact your nearest National Semiconductor Sales Office.
Table 1
are available. For other custom voltage options or combina-
www.national.com3

Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required,
LP2966
Output Voltage (Survival)(Note 6), (Note 7)
−0.3V to (Vin + 0.3V)
please contact the National Semiconductor Sales Office/ Distributors for availability and specifications.
Storage Temperature Range −65 to +150˚C Lead Temp. (Soldering, 5 sec.) 260˚C Power Dissipation (Note 2) Internally Limited ESD Rating (Note 3) 2kV Input Supply Voltage (Survival) −0.3V to 7.5V Shutdown Input Voltage (Survival) −0.3V to (Vin + 0.3V) Maximum Voltage for ERROR Pins I
(Survival) Short Circuit Protected
OUT
10V

Operating Ratings (Note 1)

Input Supply Voltage 2.7V to 7.0V Shutdown Input Voltage −0.3V to (Vin + 0.3V) Operating Junction
Temperature Range Maximum Voltage for ERROR
pins
−40˚C to +125˚C

Electrical Characteristics

Limits in standard typeface are for Tj= 25˚C, and limits in boldface type apply over the full operating junction temperature range. Unless otherwise specified, V
IN=VO(NOM)
Symbol Parameter Conditions
V
o
(Note 13)
∆V
/∆V
O
(Note 8) (Note 13)
/∆I
∆V
O
OUT
IN
Output Voltage Tolerance
Output Voltage Line Regulation
Output Voltage Load Regulation (Note 9)
∆V
/∆I
O2
OUT1
Output Voltage Cross Regulation (Note 10)
V
IN-VOUT
Dropout Voltage (Note 12)
I
(Note 18) Ground Pin Current
GND(1,0)
(One LDO On)
I
GND(1,1)
Ground Pin Current (Both LDOs On)
I
GND(0,0)
Ground Pin Current in Shutdown Mode
I
O(PK)
Peak Output Current (Note 2)
Short Circuit Foldback Protection
I
FB
Short Circuit Foldback Knee
Over Temperature Protection
Tsh(t) Shutdown Threshold 165 ˚C
+ 1V, (Note 16), C
V
+1V<V
OUT
<
7.0V 0.0 −1 1
IN
OUT
= 1µF, I
Typ (Note
4)
= 1mA, CIN= 1µF, V
OUT
LP2966IMM (Note 5)
Min Max
SD1=VSD2=VIN
-3 3
<
1mA
<
I
100mA 0.0 −1.5 1.5
L
-3.5 3.5
0.1 mV/V
1mA<I (Note 9)
1mA<I
<
L
L1
100mA
<
100mA
0.1 mV/mA
0.0004
(Note 10) IL= 1mA 0.9 2.0
3.0
I
= 100mA 90 130
L
180
I
= 150mA 135 195
L
270
IL= 1mA 300 V
≤ 0.1V, V
SD2
SD1=VIN
IL= 100mA 340 V
≤ 0.1V, V
SD2
SD1=VIN
IL= 1mA 340 450
500
I
= 100mA 420 540
L
600
V
SD1=VSD2
≤ 0.1V 0.006 0.3
10
500 350
≥ V
V
OUT
OUT(NOM)
-5%
150
(Note 2), (Note 14) 600 mA
10V
Unit
%V
NOM
%V
NOM
mV/mA
mV
µA
µA
µA
mA
.
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Electrical Characteristics (Continued)
Limits in standard typeface are for Tj= 25˚C, and limits in boldface type apply over the full operating junction temperature range. Unless otherwise specified, V
IN=VO(NOM)
Symbol Parameter Conditions
Tsh(h) Thermal Shutdown
Hysteresis
Shutdown Input
V
SDT
Shutdown Threshold (Note 15)
T
dOFF
Turn-off Delay (Note
17)
T
dON
Turn-on Delay (Note
17)
I
SD
SD Input Current VSD=V
Error Flag Comparators
V
T
Threshold (output goes high to low)
V
TH
V
ERR(Sat)
I
EF(leak)
Threshold Hysteresis 5 28%
Error Flag Saturation I Error Flag Pin
Leakage Current
I
(EFsink)
Error Flag Pin Sink Current
AC Parameters
PSRR Ripple Rejection V
ρn(1/f) Output Noise Density f =120Hz 1 µV/ e
n
Output Noise Voltage (rms)
Note 1: Absolute maximum ratings indicate limits beyond which damage to the device may occur. Operating ratings indicate conditions for which the device is intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see Electrical characteristics. The guaranteed specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed test conditions.
Note 2: At elevated temperatures, devices must be derated based on package thermal resistance. The device in the surface-mount package must be derated at
= 235˚C/W, junction-to-ambient. Please refer to the applications section on maximum current capability for further information. The device has internal thermal
θ
jA
protection.
Note 3: The human body model is a 100pF capacitor discharged through a 1.5kΩ resistor into each pin. Note 4: : Typical numbers are at 25˚C and represent the most likely parametric norm. Note 5: :Limitsare100%productiontested at 25˚C. Limits over the operating temperature range are guaranteed through correlation using Statistical Quality Control
(SQC) methods. The limits are used to calculate National’s Averaging Outgoing Quality Level (AOQL).
Note 6: If used in a dual-supply system where the regulator load is returned to a negative supply, the LP2966 output must be diode-clamped to ground. Note 7: Theoutput PMOS structure contains a diode between the V
will turn on this diode.
Note 8: Output voltage line regulation is defined as the change in output voltage from the nominal value due to change in input line voltage. Note 9: Output voltage load regulation is defined as the change in output voltage from the nominal value when the load current changes from 1mA to 100mA. Note 10: Output voltage cross regulation is defined as the percentage change in the output voltage from the nominal value at one output when the load current
changes from 1mA to full load in the other output. This is an important parameter in multiple output regulators. The specification for ∆V specification for ∆V
Note 11: Error Flag threshold and hysteresis are specified as the percentage below the regulated output voltage. Note 12: Dropout voltage is defined as the input to output differential at which the output voltage drops 100mV below the nominal value. Drop-out voltage
specification applies only to output voltages greater than 2.7V.For output voltages below 2.7V,the drop-out voltage is nothing but the input to output differential, since the minimum input voltage is 2.7V.
/∆I
.
O2
OUT1
+ 1V, (Note 16), C
OUT
= 1µF, I
Typ (Note
4)
= 1mA, CIN= 1µF, V
OUT
LP2966IMM (Note 5)
Min Max
SD1=VSD2=VIN
25
Output = Low 0 0.1 Output = High V
IN
VIN- 0.1
IL= 100 mA 20 µsec
IL= 100 mA 25 µsec
IN
=0V 1
V
SD
1
10 516%
(Note 11)
(Note 11)
= 100µA 0.015 0.1 V
Fsink
1nA
1mA
IN=VOUT
120Hz, V V
IN=VOUT
120Hz, V
+ 1V, f =
= 3.3V
OUT
+ 0.3V, f =
= 3.3V
OUT
BW = 10Hz − 100kHz,
= 10µF
C
OUT
BW = 300Hz − 300kHz, C
= 10µF
OUT
and V
IN
terminals that is normally reverse-biased. Reversing the polarity from VINand V
OUT
60
40
150
100
µV(rms)
/∆I
O1
is equal to the
OUT2
Unit
˚C
V
nA
dB
√
LP2966
.
Hz
OUT
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