NSC LP3990MF-3.3 150ma linear voltage regulator for digital application Datasheet

LP3990
150mA Linear Voltage Regulator for Digital Applications
General Description
Key Specifications
The LP3990 regulator is designed to meet the requirements
of portable, battery-powered systems providing an accurate
output voltage, low noise, and low quiescent current. The
LP3990 will provide a 0.8V output from the low input voltage
of 2V at up to 150mA load current. When switched into
shutdown mode via a logic signal at the enable pin, the
power consumption is reduced to virtually zero.
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The LP3990 is designed to be stable with space saving
ceramic capacitors as small as 0.47µF.
Performance is specified for a -40˚C to 125˚C junction temperature range.
For output voltages other than 0.8V, 1.35V, 1.5V, 1.8V, 2.5V,
2.8V, or 3.3V please contact your local NSC sales office.
2.0 to 6.0V
0.8 to 3.3V
150mA
0.47uF
< 10nA
43uA
150uVRMS
55dB at 1kHz
105us
Package
All available in Lead Free option.
4 Pin micro SMD
Features
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Input Voltage Range
Output Voltage Range
Output Current
Output Stable - Capacitors
Virtually Zero IQ (Disabled)
Very Low IQ (Enabled)
Low Output Noise
PSRR
Fast Start Up
1% Voltage Accuracy at Room Temperature
Stable with Ceramic Capacitor
Logic Controlled Enable
No Noise Bypass Capacitor Required
Thermal-Overload and Short-Circuit Protection
1 mm x 1.28mm
6 pin LLP (SOT23 footprint)
SOT23 - 5
For other package options contact your NSC sales office.
Applications
n Cellular Handsets
n Hand-Held Information Appliances
Typical Application Circuit
20076801
© 2004 National Semiconductor Corporation
DS200768
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LP3990 150mA Linear Voltage Regulator for Digital Applications
November 2004
LP3990
Pin Descriptions
Packages
Pin No
Symbol
Name and Function
LLP
micro
SMD
SOT23-5
5
A2
3
VEN
Enable Input; Enables the Regulator when ≥ 0.95V.
Disables the Regulator when ≤ 0.4V.
Enable Input has 1MΩ pulldown resistor to GND.
2
A1
2
GND
Common Ground. Connect to Pad.
1
B1
5
VOUT
Voltage output. A 0.47µF Low ESR Capacitor should be
connected to this Pin. Connect this output to the load circuit.
6
B2
1
VIN
Voltage Supply Input. A 1.0µF capacitor should be connected
at this input.
4
3
N/C
No Connection. Do not connect to any other pin.
4
N/C
No Connection. Do not connect to any other pin.
Pad
GND
Common Ground. Connect to Pin 2.
Connection Diagrams
Micro SMD, 4 Bump Package
20076803
See NS package number TLA04
LLP-6 Package
20076806
See NS package number SDE06A
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2
LP3990
Connection Diagrams
(Continued)
SOT23 - 5 Package (MF)
20076808
See NS package number MF05A
3
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LP3990
Ordering Information
For micro SMD Package
* Please contact Sales Office for Availability
Output
Voltage (V)
Grade
LP3990 Supplied as 250
Units, Tape and Reel
LP3990 Supplied as 3000
Units, Tape and Reel
0.8
STD
LP3990TL-0.8
LP3990TLX-0.8
1.2*
STD
LP3990TL-1.2
LP3990TLX-1.2
1.35
STD
LP3990TL-1.35
LP3990TLX-1.35
1.5
STD
LP3990TL-1.5
LP3990TLX-1.5
1.8
STD
LP3990TL-1.8
LP3990TLX-1.8
2.5*
STD
LP3990TL-2.5
LP3990TLX-2.5
2.8
STD
LP3990TL-2.8
LP3990TLX-2.8
3.3*
STD
LP3990TL-3.3
LP3990TLX-3.3
Package Marking
For LLP-6 Package
* Please contact Sales Office for Availability
Output
Voltage (V)
Grade
LP3990 Supplied as 1000
Units, Tape and Reel
LP3990 Supplied as 3000
Units, Tape and Reel
Package Marking
0.8
STD
LP3990SD-0.8
LP3990SDX-0.8
L085B
1.2*
STD
LP3990SD-1.2
LP3990SDX-1.2
L086B
1.35*
STD
LP3990SD-1.35
LP3990SDX-1.35
L150B
1.5
STD
LP3990SD-1.5
LP3990SDX-1.5
L087B
1.8
STD
LP3990SD-1.8
LP3990SDX-1.8
L088B
2.5
STD
LP3990SD-2.5
LP3990SDX-2.5
L090B
2.8*
STD
LP3990SD-2.8
LP3990SDX-2.8
L091B
3.3*
STD
LP3990SD-3.3
LP3990SDX-3.3
L092B
For SOT23 - 5 Package
* Please contact Sales Office for Availability
Output
Voltage (V)
Grade
LP3990 Supplied as 1000
Units, Tape and Reel
LP3990 Supplied as 3000
Units, Tape and Reel
Package Marking
0.8*
STD
LP3990MF-0.8
LP3990MFX-0.8
SCCB
1.2*
STD
LP3990MF-1.2
LP3990MFX-1.2
SCDB
1.35*
STD
LP3990MF-1.35
LP3990MFX-1.35
SHRB
1.5*
STD
LP3990MF-1.5
LP3990MFX-1.5
SCEB
1.8*
STD
LP3990MF-1.8
LP3990MFX-1.8
SCFB
2.5*
STD
LP3990MF-2.5
LP3990MFX-2.5
SCJB
2.8*
STD
LP3990MF-2.8
LP3990MFX-2.8
SCKB
3.3*
STD
LP3990MF-3.3
LP3990MFX-3.3
SCLB
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4
ESD (Note 5)
(Notes 1, 2)
Human Body Model
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Machine Model
Input Voltage
Operating Ratings(Note 1)
-0.3 to 6.5V
Output Voltage
-0.3 to (VIN + 0.3V) to
6.5V (max)
Enable Input Voltage
-0.3 to (VIN + 0.3V) to
6.5V (max)
Junction Temperature
Input Voltage
235˚C
260˚C
Storage Temperature
0 to (VIN + 0.3V) to
6.0V (max)
Junction Temperature
-40˚C to 125˚C
Ambient Temperature TARange
(Note 6)
Lead/Pad Temp. (Note 3)
micro SMD
2V to 6V
Enable Input Voltage
150˚C
LLP/SOT23
2KV
200V
-40˚C to 85˚C
Thermal Properties(Note 1)
-65 to 150˚C
Junction To Ambient Thermal
Resistance(Note 8)
Continuous Power Dissipation
Internally Limited(Note 4)
θJA(LLP-6)
88˚C/W
θJA(microSMD)
220˚C/W
θJASOT23-5
220˚C/W
Electrical Characteristics
Unless otherwise noted, VEN =950mV, VIN = VOUT + 1.0V, or 2.0V, whichever is higher. CIN = 1 µF, IOUT = 1 mA, COUT =0.47
µF. Typical values and limits appearing in normal type apply for TJ = 27˚C. Limits appearing in boldface type apply over the
full junction temperature range for operation, −40 to +125˚C. (Note 13)
Symbol
Parameter
Conditions
VIN
Input Voltage
(Note 14)
∆VOUT
Output Voltage Tolerance
ILOAD = 1 mA
Over full line
and load
regulation.
Typ
Limit
Min
2
6
-1
+1
LLP
-1.5
+1.5
Micro SMD
-2.5
+2.5
-3
+3
Micro SMD
LLP
Units
Max
V
%
Line Regulation Error
VIN = (VOUT(NOM) + 1.0V) to 6.0V,
0.02
-0.1
0.1
Load Regulation Error
IOUT = 1mA
to 150mA
VOUT = 0.8 to 1.95V
MicroSMD
0.002
-0.005
0.005
VOUT = 0.8 to 1.95V
LLP, SOT-23
0.003
-0.008
0.008
VOUT = 2.0 to 3.3V
MicroSMD
0.0005
-0.002
0.002
VOUT = 2.0 to 3.3V
LLP, SOT-23
0.002
-0.005
0.005
VDO
Dropout Voltage
IOUT = 150mA
(Note 7)
120
ILOAD
Load Current
(Notes 9, 10)
IQ
Quiescent Current
VEN = 950mV, IOUT = 0mA
43
80
VEN = 950mV, IOUT = 150mA
65
120
Short Circuit Current Limit
IOUT
Maximum Output Current
PSRR
Power Supply Rejection Ratio
(Note 11)
0.2
550
1000
150
55
f = 10kHz, IOUT = 150mA
35
5
µA
0.002
f = 1kHz, IOUT = 1mA to 150mA
%/mA
mV
0
VEN = 0.4V
ISC
%/V
µA
mA
mA
dB
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LP3990
Absolute Maximum Ratings
LP3990
Electrical Characteristics
(Continued)
Unless otherwise noted, VEN =950mV, VIN = VOUT + 1.0V, or 2.0V, whichever is higher. CIN = 1 µF, IOUT = 1 mA, COUT =0.47
µF. Typical values and limits appearing in normal type apply for TJ = 27˚C. Limits appearing in boldface type apply over the
full junction temperature range for operation, −40 to +125˚C. (Note 13)
Symbol
en
Parameter
Output noise Voltage (Note 10)
TSHUTDOWN Thermal Shutdown
Conditions
BW = 10Hz to
100kHz,
Typ
VOUT = 0.8
60
VOUT = 1.5
125
VOUT = 3.3
180
Temperature
155
Hysteresis
15
0.001
Limit
Min
Max
Units
µVRMS
˚C
Enable Control Characteristics
IEN
(Note 12)
Maximum Input Current at
VEN Input
VEN = 0.0V
VIL
Low Input Threshold
VIN = 2V to 6V
VIH
High Input Threshold
VIN = 2V to 6V
VEN = 6V
6
0.1
2.5
10
0.4
0.95
µA
V
V
Timing Characteristics
TON
Transient
Response
Turn On Time (Note 10)
VOUT = 0.8
To 95% Level
VIN(MIN) to 6.0V VOUT = 1.5
80
150
105
200
VOUT = 3.3
175
250
8
16
mV
(pk - pk)
55
80
mV
Line Transient Response |δVOUT| Trise = Tfall = 30µs (Note 10)
δVIN = 600mV
Load Transient Response
|δVOUT|
Trise = Tfall = 1µs (Note 10)IOUT = 1mA
to 150mA
COUT = 1µF
µs
Note 1: Absolute Maximum Ratings are limits beyond which damage can occur. Operating Ratings are conditions under which operation of the device is
guaranteed. Operating Ratings do not imply guaranteed performance limits. For guaranteed performance limits and associated test conditions, see the Electrical
Characteristics tables.
Note 2: All Voltages are with respect to the potential at the GND pin.
Note 3: For further information on these packages please refer to the following application notes;AN-1112 Micro SMD Package Wafer Level Chip Scale
Package,AN-1187 Leadless Leadframe Package.
Note 4: Internal thermal shutdown circuitry protects the device from permanent damage.
Note 5: The human body model is 100pF discharged through a 1.5kΩ resistor into each pin. The machine model is a 200pF capacitor discharged directly into each
pin.
Note 6: The maximum ambient temperature (TA(max)) is dependant on the maximum operating junction temperature (TJ(max-op) = 125˚C), the maximum power
dissipation of the device in the application (PD(max)), and the junction to ambient thermal resistance of the part/package in the application (θJA), as given by the
following equation: TA(max) = TJ(max-op) - (θJA x PD(max)).
Note 7: Dropout voltage is voltage difference between input and output at which the output voltage drops to 100mV below its nominal value. This parameter only
for output voltages above 2.0V.
Note 8: Junction to ambient thermal resistance is dependant on the application and board layout. In applications where high maximum power dissipation is possible,
special care must be paid to thermal dissipation issues in board design.
Note 9: The device maintains the regulated output voltage without the load.
Note 10: This electrical specification is guaranteed by design.
Note 11: Short circuit current is measured with VOUT pulled to 0V and VIN worst case = 6.0V.
Note 12: Enable Pin has 1MΩ typical, resistor connected to GND.
Note 13: All limits are guaranteed. All electrical characteristics having room-temperature limits are tested during production at TJ = 25˚C or correlated using
Statistical Quality Control methods. Operation over the temperature specification is guaranteed by correlating the electrical characteristics to process and
temperature variations and applying statistical process control.
Note 14: VIN(MIN) = VOUT(NOM) + 0.5V, or 2.0V, whichever is higher.
Output Capacitor, Recommended Specifications
Symbol
COUT
Parameter
Output Capacitor
Conditions
Capacitance
(Note 15)
Limit
Min
-40˚C to +125˚C
1.0
0.68
0˚C to +125˚C
0.47
0.33
ESR
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Typ
5
6
Max
Units
µF
500
mΩ
(Continued)
Note 15: The capacitor tolerance should be 30% or better over temperature. The full operating conditions for the application should be considered when selecting
a suitable capacitor to ensure that the minimum value of capacitance is always met. Recommended capacitor type is X7R. However, dependent on application, X5R,
Y5V, and Z5U can also be used. (See capacitor section in Applications Hints)
Typical Performance Characteristics. Unless otherwise specified, CIN = 1.0µF Ceramic, COUT =
0.47 µF Ceramic, VIN = VOUT(NOM) + 1.0V, TA = 25˚C, VOUT(NOM) = 1.5V , Shutdown pin is tied to VIN.
Output Voltage Change vs Temperature
Ground Current vs Load Current
20076831
20076810
Ground Current vs VIN. ILOAD = 0mA
Ground Current vs VIN. ILOAD = 1mA
20076812
20076813
7
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LP3990
Output Capacitor, Recommended Specifications
LP3990
Typical Performance Characteristics. Unless otherwise specified, CIN = 1.0µF Ceramic, COUT =
0.47 µF Ceramic, VIN = VOUT(NOM) + 1.0V, TA = 25˚C, VOUT(NOM) = 1.5V , Shutdown pin is tied to VIN. (Continued)
Ground Current vs VIN. ILOAD = 150mA
Short Circuit Current
20076815
20076814
Short Circuit Current
Line transient
20076817
20076816
Power Supply Rejection Ratio
Power Supply Rejection Ratio
20076819
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20076820
8
Enable Start-up Time
Enable Start-up Time
20076821
20076822
Load Transient
Noise Density
20076825
20076828
9
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LP3990
Typical Performance Characteristics. Unless otherwise specified, CIN = 1.0µF Ceramic, COUT =
0.47 µF Ceramic, VIN = VOUT(NOM) + 1.0V, TA = 25˚C, VOUT(NOM) = 1.5V , Shutdown pin is tied to VIN. (Continued)
LP3990
In particular, the output capacitor selection should take account of all the capacitor parameters, to ensure that the
specification is met within the application. The capacitance
can vary with DC bias conditions as well as temperature and
frequency of operation. Capacitor values will also show
some decrease over time due to aging. The capacitor parameters are also dependant on the particular case size,
with smaller sizes giving poorer performance figures in general. As an example, Figure 1 shows a typical graph comparing different capacitor case sizes in a Capacitance vs. DC
Bias plot. As shown in the graph, increasing the DC Bias
condition can result in the capacitance value falling below
the minimum value given in the recommended capacitor
specifications table (0.33µF in this case). Note that the graph
shows the capacitance out of spec for the 0402 case size
capacitor at higher bias voltages. It is therefore recommended that the capacitor manufacturers’ specifications for
the nominal value capacitor are consulted for all conditions,
as some capacitor sizes (e.g. 0402) may not be suitable in
the actual application.
Application Hints
EXTERNAL CAPACITORS
In common with most regulators, the LP3990 requires external capacitors for regulator stability. The LP3990 is specifically designed for portable applications requiring minimum
board space and smallest components. These capacitors
must be correctly selected for good performance.
INPUT CAPACITOR
An input capacitor is required for stability. It is recommended
that a 1.0µF capacitor be connected between the LP3990
input pin and ground (this capacitance value may be increased without limit).
This capacitor must be located a distance of not more than
1cm from the input pin and returned to a clean analogue
ground. Any good quality ceramic, tantalum, or film capacitor
may be used at the input.
Important: Tantalum capacitors can suffer catastrophic failures due to surge current when connected to a lowimpedance source of power (like a battery or a very large
capacitor). If a tantalum capacitor is used at the input, it must
be guaranteed by the manufacturer to have a surge current
rating sufficient for the application.
There are no requirements for the ESR (Equivalent Series
Resistance) on the input capacitor, but tolerance and temperature coefficient must be considered when selecting the
capacitor to ensure the capacitance will remain ) 1.0µF over
the entire operating temperature range.
OUTPUT CAPACITOR
The LP3990 is designed specifically to work with very small
ceramic output capacitors. A 0.47µF ceramic capacitor (temperature types Z5U, Y5V or X7R) with ESR between 5mΩ to
500mΩ, is suitable in the LP3990 application circuit.
For this device the output capacitor should be connected
between the VOUT pin and ground.
It is also possible to use tantalum or film capacitors at the
device output, COUT (or VOUT), but these are not as attractive for reasons of size and cost (see the section Capacitor
Characteristics).
The output capacitor must meet the requirement for the
minimum value of capacitance and also have an ESR value
that is within the range 5mΩ to 500mΩ for stability.
20076840
FIGURE 1. Graph Showing a Typical Variation in
Capacitance vs DC Bias
The ceramic capacitor’s capacitance can vary with temperature. The capacitor type X7R, which operates over a temperature range of -55˚C to +125˚C, will only vary the capacitance to within ± 15%. The capacitor type X5R has a similar
tolerance over a reduced temperature range of -55˚C to
+85˚C. Many large value ceramic capacitors, larger than 1µF
are manufactured with Z5U or Y5V temperature characteristics. Their capacitance can drop by more than 50% as the
temperature varies from 25˚C to 85˚C. Therefore X7R is
recommended over Z5U and Y5V in applications where the
ambient temperature will change significantly above or below 25˚C.
Tantalum capacitors are less desirable than ceramic for use
as output capacitors because they are more expensive when
comparing equivalent capacitance and voltage ratings in the
0.47µF to 4.7µF range.
Another important consideration is that tantalum capacitors
have higher ESR values than equivalent size ceramics. This
means that while it may be possible to find a tantalum
capacitor with an ESR value within the stable range, it would
have to be larger in capacitance (which means bigger and
more costly) than a ceramic capacitor with the same ESR
value. It should also be noted that the ESR of a typical
NO-LOAD STABILITY
The LP3990 will remain stable and in regulation with no
external load. This is an important consideration in some
circuits, for example CMOS RAM keep-alive applications.
CAPACITOR CHARACTERISTICS
The LP3990 is designed to work with ceramic capacitors on
the output to take advantage of the benefits they offer. For
capacitance values in the range of 0.47µF to 4.7µF, ceramic
capacitors are the smallest, least expensive and have the
lowest ESR values, thus making them best for eliminating
high frequency noise. The ESR of a typical 0.47µF ceramic
capacitor is in the range of 20mΩ to 40mΩ, which easily
meets the ESR requirement for stability for the LP3990.
For both input and output capacitors, careful interpretation of
the capacitor specification is required to ensure correct device operation. The capacitor value can change greatly, depending on the operating conditions and capacitor type.
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10
Micro SMD MOUNTING
(Continued)
The micro SMD package requires specific mounting techniques, which are detailed in National Semiconductor Application Note AN-1112.
For best results during assembly, alignment ordinals on the
PC board may be used to facilitate placement of the micro
SMD device.
tantalum will increase about 2:1 as the temperature goes
from 25˚C down to -40˚C, so some guard band must be
allowed.
ENABLE CONTROL
The LP3990 features an active high Enable pin, VEN, which
turns the device on when pulled high. When not enabled the
regulator output is off and the device typically consumes
2nA.
If the application does not require the Enable switching
feature, the VEN pin should be tied to VIN to keep the
regulator output permanently on.
Micro SMD LIGHT SENSITIVITY
Exposing the micro SMD device to direct light may affect the
operation of the device. Light sources, such as halogen
lamps, can affect electrical performance, if placed in close
proximity to the device.
Light with wavelengths in the infra-red portion of the spectrum is the most detrimental, and so, fluorescent lighting
used inside most buildings, has little or no effect on performance.
To ensure proper operation, the signal source used to drive
the VEN input must be able to swing above and below the
specified turn-on/off voltage thresholds listed in the Electrical
Characteristics section under VIL and VIH.
11
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LP3990
Application Hints
LP3990
Physical Dimensions
inches (millimeters) unless otherwise noted
micro SMD, 4 Bump, Package (TLA04)
NS Package Number TLA04ALA
The dimensions for X1, X2 and X3 are given as:
X1 = 1.003 +/− 0.03mm
X2 = 1.283 +/− 0.03mm
X3 = 0.600 +/− 0.075mm
LLP, 6 Lead, Package (SOT23 Land)
NS Package Number SDE06A
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12
inches (millimeters) unless otherwise noted (Continued)
SOT23 - 5 Package
NS Package Number MF05A
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves
the right at any time without notice to change said circuitry and specifications.
For the most current product information visit us at www.national.com.
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(b) support or sustain life, and whose failure to perform when
properly used in accordance with instructions for use
provided in the labeling, can be reasonably expected to result
in a significant injury to the user.
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device or system whose failure to perform can be reasonably
expected to cause the failure of the life support device or
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LP3990 150mA Linear Voltage Regulator for Digital Applications
Physical Dimensions
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