LP3990SD-1.35 [NSC]
150mA Linear Voltage Regulator for Digital Applications; 150mA线性稳压器为数字应用
| 型号： | LP3990SD-1.35 |
| 厂家： | 
National Semiconductor |
| 描述： | 150mA Linear Voltage Regulator for Digital Applications |
| 文件： | 总13页 (文件大小：709K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
November 2004
LP3990
150mA Linear Voltage Regulator for Digital Applications
General Description
Key Specifications
n Input Voltage Range
n Output Voltage Range
n Output Current
n Output Stable - Capacitors
n Virtually Zero IQ (Disabled)
n Very Low IQ (Enabled)
n Low Output Noise
n PSRR
2.0 to 6.0V
0.8 to 3.3V
150mA
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.
0.47uF
<
10nA
43uA
150uVRMS
55dB at 1kHz
105us
The LP3990 is designed to be stable with space saving
ceramic capacitors as small as 0.47µF.
n Fast Start Up
Performance is specified for a -40˚C to 125˚C junction tem-
perature range.
For output voltages other than 0.8V, 1.35V, 1.5V, 1.8V, 2.5V, Package
2.8V, or 3.3V please contact your local NSC sales office.
All available in Lead Free option.
4 Pin micro SMD
1 mm x 1.28mm
Features
6 pin LLP (SOT23 footprint)
n 1% Voltage Accuracy at Room Temperature
n Stable with Ceramic Capacitor
n Logic Controlled Enable
SOT23 - 5
For other package options contact your NSC sales office.
n No Noise Bypass Capacitor Required
n Thermal-Overload and Short-Circuit Protection
Applications
n Cellular Handsets
n Hand-Held Information Appliances
Typical Application Circuit
20076801
© 2004 National Semiconductor Corporation
DS200768
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Pin Descriptions
Packages
Pin No
micro
Symbol
Name and Function
LLP
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
1
A1
B1
2
5
GND
VOUT
Common Ground. Connect to Pad.
Voltage output. A 0.47µF Low ESR Capacitor should be
connected to this Pin. Connect this output to the load circuit.
Voltage Supply Input. A 1.0µF capacitor should be connected
at this input.
6
B2
1
4
VIN
3
4
N/C
N/C
No Connection. Do not connect to any other pin.
No Connection. Do not connect to any other pin.
Common Ground. Connect to Pin 2.
Pad
GND
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
Connection Diagrams (Continued)
SOT23 - 5 Package (MF)
20076808
See NS package number MF05A
3
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Ordering Information
For micro SMD Package
LP3990 Supplied as 250 LP3990 Supplied as 3000
* Please contact Sales Office for Availability
Output
Voltage (V)
0.8
Grade
Package Marking
Units, Tape and Reel
LP3990TL-0.8
LP3990TL-1.2
LP3990TL-1.35
LP3990TL-1.5
LP3990TL-1.8
LP3990TL-2.5
LP3990TL-2.8
LP3990TL-3.3
Units, Tape and Reel
LP3990TLX-0.8
LP3990TLX-1.2
LP3990TLX-1.35
LP3990TLX-1.5
LP3990TLX-1.8
LP3990TLX-2.5
LP3990TLX-2.8
LP3990TLX-3.3
STD
STD
STD
STD
STD
STD
STD
STD
1.2*
1.35
1.5
1.8
2.5*
2.8
3.3*
For LLP-6 Package
* Please contact Sales Office for Availability
Output
Voltage (V)
0.8
LP3990 Supplied as 1000
Units, Tape and Reel
LP3990 Supplied as 3000
Units, Tape and Reel
LP3990SDX-0.8
Grade
Package Marking
L085B
STD
STD
STD
STD
STD
STD
STD
STD
LP3990SD-0.8
LP3990SD-1.2
LP3990SD-1.35
LP3990SD-1.5
LP3990SD-1.8
LP3990SD-2.5
LP3990SD-2.8
LP3990SD-3.3
1.2*
LP3990SDX-1.2
L086B
1.35*
1.5
LP3990SDX-1.35
LP3990SDX-1.5
L150B
L087B
1.8
LP3990SDX-1.8
L088B
2.5
LP3990SDX-2.5
L090B
2.8*
LP3990SDX-2.8
L091B
3.3*
LP3990SDX-3.3
L092B
For SOT23 - 5 Package
* Please contact Sales Office for Availability
Output
Voltage (V)
0.8*
LP3990 Supplied as 1000
Units, Tape and Reel
LP3990MF-0.8
LP3990 Supplied as 3000
Units, Tape and Reel
LP3990MFX-0.8
Grade
Package Marking
SCCB
STD
STD
STD
STD
STD
STD
STD
STD
1.2*
LP3990MF-1.2
LP3990MFX-1.2
SCDB
1.35*
1.5*
LP3990MF-1.35
LP3990MF-1.5
LP3990MFX-1.35
LP3990MFX-1.5
SHRB
SCEB
1.8*
LP3990MF-1.8
LP3990MFX-1.8
SCFB
2.5*
LP3990MF-2.5
LP3990MFX-2.5
SCJB
2.8*
LP3990MF-2.8
LP3990MFX-2.8
SCKB
3.3*
LP3990MF-3.3
LP3990MFX-3.3
SCLB
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4
Absolute Maximum Ratings
ESD (Note 5)
Human Body Model
Machine Model
2KV
(Notes 1, 2)
200V
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Operating Ratings(Note 1)
Input Voltage
Input Voltage
-0.3 to 6.5V
-0.3 to (VIN + 0.3V) to
6.5V (max)
2V to 6V
0 to (VIN + 0.3V) to
6.0V (max)
Output Voltage
Enable Input Voltage
Enable Input Voltage
-0.3 to (VIN + 0.3V) to
6.5V (max)
Junction Temperature
Ambient Temperature TARange
(Note 6)
-40˚C to 125˚C
-40˚C to 85˚C
Junction Temperature
Lead/Pad Temp. (Note 3)
LLP/SOT23
150˚C
235˚C
260˚C
Thermal Properties(Note 1)
micro SMD
Storage Temperature
Continuous Power Dissipation
Internally Limited(Note 4)
-65 to 150˚C
Junction To Ambient Thermal
Resistance(Note 8)
θ
θ
θ
JA(LLP-6)
88˚C/W
220˚C/W
220˚C/W
JA(microSMD)
JASOT23-5
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)
Limit
Symbol
VIN
Parameter
Input Voltage
Conditions
Typ
Units
Min
2
Max
6
(Note 14)
V
∆VOUT
Output Voltage Tolerance
ILOAD = 1 mA
Micro SMD
-1
+1
LLP
-1.5
-2.5
+1.5
+2.5
%
Over full line
and load
Micro SMD
LLP
-3
+3
regulation.
Line Regulation Error
Load Regulation Error
VIN = (VOUT(NOM) + 1.0V) to 6.0V,
0.02
-0.1
0.1
%/V
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
0.0005
0.002
120
-0.008
-0.002
-0.005
0.008
0.002
0.005
%/mA
VOUT = 2.0 to 3.3V
MicroSMD
VOUT = 2.0 to 3.3V
LLP, SOT-23
VDO
Dropout Voltage
IOUT = 150mA
(Note 7)
mV
µA
ILOAD
IQ
Load Current
(Notes 9, 10)
0
Quiescent Current
VEN = 950mV, IOUT = 0mA
VEN = 950mV, IOUT = 150mA
VEN = 0.4V
43
65
80
120
0.2
µA
0.002
550
ISC
Short Circuit Current Limit
Maximum Output Current
Power Supply Rejection Ratio
(Note 11)
1000
mA
mA
IOUT
PSRR
150
f = 1kHz, IOUT = 1mA to 150mA
f = 10kHz, IOUT = 150mA
55
35
dB
5
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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)
Limit
Symbol
Parameter
Conditions
Typ
Units
µVRMS
˚C
Min
Max
en
Output noise Voltage (Note 10)
BW = 10Hz to VOUT = 0.8
60
125
180
155
15
100kHz,
VOUT = 1.5
VOUT = 3.3
TSHUTDOWN Thermal Shutdown
Temperature
Hysteresis
Enable Control Characteristics
IEN
Maximum Input Current at
VEN = 0.0V
VEN = 6V
0.001
6
0.1
10
µA
(Note 12)
VEN Input
2.5
VIL
VIH
Low Input Threshold
High Input Threshold
VIN = 2V to 6V
VIN = 2V to 6V
0.4
V
V
0.95
Timing Characteristics
TON
Turn On Time (Note 10)
To 95% Level
VOUT = 0.8
VOUT = 1.5
VOUT = 3.3
80
150
200
250
VIN(MIN) to 6.0V
105
175
µs
Transient
Response
Line Transient Response |δVOUT| Trise = Tfall = 30µs (Note 10)
δVIN = 600mV
mV
8
16
(pk - pk)
Load Transient Response
|δVOUT
Trise = Tfall = 1µs (Note 10)IOUT = 1mA
|
to 150mA
55
80
mV
COUT = 1µF
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 (T
) is dependant on the maximum operating junction temperature (T
= 125˚C), the maximum power
J(max-op)
A(max)
dissipation of the device in the application (P
), and the junction to ambient thermal resistance of the part/package in the application (θ ), as given by the
D(max)
JA
following equation: T
= T
- (θ x P
).
A(max)
J(max-op)
JA
D(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 V
pulled to 0V and V worst case = 6.0V.
IN
OUT
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 T = 25˚C or correlated using
J
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: V
= V
+ 0.5V, or 2.0V, whichever is higher.
OUT(NOM)
IN(MIN)
Output Capacitor, Recommended Specifications
Limit
Symbol
COUT
Parameter
Output Capacitor
Conditions
Typ
Units
Min
0.68
0.33
5
Max
Capacitance
(Note 15)
-40˚C to +125˚C
0˚C to +125˚C
1.0
0.47
µF
ESR
500
mΩ
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6
Output Capacitor, Recommended Specifications (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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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
20076816
20076817
Power Supply Rejection Ratio
Power Supply Rejection Ratio
20076819
20076820
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8
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)
Enable Start-up Time
Enable Start-up Time
20076821
20076822
Load Transient
Noise Density
20076825
20076828
9
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In particular, the output capacitor selection should take ac-
count 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 pa-
rameters are also dependant on the particular case size,
with smaller sizes giving poorer performance figures in gen-
eral. As an example, Figure 1 shows a typical graph com-
paring 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 recom-
mended 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 exter-
nal capacitors for regulator stability. The LP3990 is specifi-
cally 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 in-
creased 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 fail-
ures due to surge current when connected to a low-
impedance 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 tem-
perature 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 (tem-
perature 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.
20076840
It is also possible to use tantalum or film capacitors at the
device output, COUT (or VOUT), but these are not as attrac-
tive for reasons of size and cost (see the section Capacitor
Characteristics).
FIGURE 1. Graph Showing a Typical Variation in
Capacitance vs DC Bias
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.
The ceramic capacitor’s capacitance can vary with tempera-
ture. The capacitor type X7R, which operates over a tem-
perature range of -55˚C to +125˚C, will only vary the capaci-
tance 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 characteris-
tics. 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 be-
low 25˚C.
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.
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
For both input and output capacitors, careful interpretation of
the capacitor specification is required to ensure correct de-
vice operation. The capacitor value can change greatly, de-
pending on the operating conditions and capacitor type.
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10
Micro SMD MOUNTING
Application Hints (Continued)
tantalum will increase about 2:1 as the temperature goes
from 25˚C down to -40˚C, so some guard band must be
allowed.
The micro SMD package requires specific mounting tech-
niques, which are detailed in National Semiconductor Appli-
cation 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.
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.
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.
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.
Light with wavelengths in the infra-red portion of the spec-
trum is the most detrimental, and so, fluorescent lighting
used inside most buildings, has little or no effect on perfor-
mance.
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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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
Physical Dimensions 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
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provided in the labeling, can be reasonably expected to result
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2. A critical component is any component of a life support
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