Datasheet LP3984IBP-1.5, LP3984I-1.8MWC, LP3984I-1.8MDC, LP3984I-1.5MWC, LP3984I-1.5MDC Datasheet (NSC)
...Page 1
LP3984
Micropower, 150mA Ultra Low-Dropout CMOS Voltage
Regulator in Subminiature 4-I/O micro SMD Package
General Description
The LP3984 is designed for portable and wireless applications with demanding performance and space requirements.
The LP3984’s performance is optimized for battery powered
systems to deliver extremely low dropout voltage and low
quiescent current. Regulator ground current increases only
slightly in dropout, further prolonging the battery life.
Power supply rejection is better than 60 dB at low frequencies and starts to roll off at 10 kHz. High power supply
rejection is maintained down to lower input voltage levels
common to battery operated circuits.
The device is ideal for mobile phone and similar battery
powered wireless applications. It provides up to 150 mA,
from a 2.5V to 6V input, consuming less than 1.2µA in
disable mode and has fast turn-on time less than 20µs.
The LP3984 is available in micro SMD and 5 pin SOT-23
package. Performance is specified for −40˚C to +125˚C
temperature range and is available in 1.5V, 1.8V, 2.0V, and
3.1V output voltages. For other output voltage options from
1.5V to 3.5V, please contact National Semiconductor sales
office.
Key Specifications
n 2.5 to 6.0V input range
n 150mA guaranteed output
n 60dB PSRR at 1kHz, 40dB at 10kHz
@
3.1V
IN
n ≤1.2µA quiescent current when shut down
n Fast Turn-On time: 20 µs (typ.)
n 75mV typ dropout with 150mA load
n −40 to +125˚C junction temperature range for operation
n 1.5V, 1.8V, 2.0V, and 3.1V
Features
n Miniature 4-I/O micro SMD and SOT-23-5 package
n Logic controlled enable
n Stable with tantalum capacitors
n 1 µF Tantalum output capacitor
n Fast turn-on
n Thermal shutdown and short-circuit current limit
Applications
n CDMA cellular handsets
n Wideband CDMA cellular handsets
n GSM cellular handsets
n Portable information appliances
Typical Application Circuit
20020402
Note: Pin Numbers in parenthesis indicate micro SMD package.
November 2001
LP3984 Micropower, 150mA Ultra Low-Dropout CMOS Voltage Regulator in Subminiature 4-I/O
micro SMD Package
© 2001 National Semiconductor Corporation DS200204 www.national.com
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Block Diagram
20020401
Pin Descriptions
Name µSMD SOT Function
V
EN
4 3 Enable Input Logic, Enable High
GND 1 2 Common Ground
V
OUT
2 5 Output Voltage of the LDO
V
IN
3 1 Input Voltage of the LDO
N.C. 4 No Connection
Connection Diagrams
SOT-23-5 Package
20020407
Top View
See NS Package Number MF05A
micro SMD, 4 Bump Package
20020470
Top View
See NS Package Number BPA04
Note: The actual physical placement of the package marking will vary from
part to part. The package marking will designate the date code. Package
marking does not correlate to device type in any way.
LP3984
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Ordering Information
For micro SMD Package
Output
Voltage (V)
Grade
LP3984 Supplied as 250
Units, Tape and Reel
LP3984 Supplied as 3000
Units, Tape and Reel
1.5 STD LP3984IBP-1.5 LP3984IBPX-1.5
1.8 STD LP3984IBP-1.8 LP3984IBPX-1.8
2.0 STD LP3984IBP-2.0 LP3984IBPX-2.0
3.1 STD LP3984IBP-3.1 LP3984IBPX-3.1
For SOT Package
Output
Voltage (V)
Grade
LP3984 Supplied as 1000
Units, Tape and Reel
LP3984 Supplied as 3000
Units, Tape and Reel
Package Marking
1.5 STD LP3984IMF-1.5 LP3984IMFX-1.5 LEAB
1.8 STD LP3984IMF-1.8 LP3984IMFX-1.8 LEBB
2.0 STD LP3984IMF-2.0 LP3984IMFX-2.0 LECB
3.1 STD LP3984IMF-3.1 LP3984IMFX-3.1 LEDB
LP3984
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Page 4
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.
V
IN,VOUT,VEN
−0.3 to 6.5V
Junction Temperature 150˚C
Storage Temperature −65˚C to +150˚C
Lead Temp. (Note 3) 235˚C
Pad Temp. (Note 3) 235˚C
Power Dissipation (Note 4)
θ
JA
(SOT23-5)
θ
JA
(micro SMD)
220˚C/W
340˚C/W
Maximum Power Dissipation
SOT23-5
Micro SMD
364mW
235mW
ESD Rating(Note 5)
Human Body Model
Machine Model
2kV
200V
Operating Ratings (Notes 1, 2)
V
IN
2.5 to 6V
V
EN
0to(VIN+ 0.3V)
Junction Temperature −40˚C to +125˚C
Maximum Power Dissipation (Note 6)
SOT23-5
micro SMD
250mW
160mW
Electrical Characteristics
Unless otherwise specified: VIN= 2.5V for 1.5, 1.8, & 2.0V options, VIN=V
OUT
+ 0.5 for output options higher than 2.5V, CIN=
1 µF, I
OUT
= 1mA, C
OUT
= 1 µF, tantalum. Typical values and limits appearing in standard typeface are for TJ= 25˚C. Limits
appearing in boldface type apply over the entire junction temperature range for operation, −40˚C to +125˚C. (Note 7) (Note 8)
Symbol Parameter Conditions Typ
Limit
Units
Min Max
∆V
OUT
Output Voltage
Tolerance
−1.2
−2.0
1.2
2.0
%of
V
OUT(nom)
Line Regulation Error VIN= 2.5V to 4.5V for 1.5, 1.8, 2.0V
options
V
IN
=(V
OUT
+ 0.5V) to 4.5V for
Voltage options higher than 2.5V
0.05 −0.15 0.15
%/V
Load Regulation Error
(Note 9)
I
OUT
= 1 mA to 150 mA
LP3984IM5 (SOT23-5)
0.002 0.005
%/mA
LP3984IBP (micro SMD) 0.0009 0.002
PSRR Power Supply Rejection Ratio
V
IN=VOUT(nom)
+ 0.2V,
f = 1 kHz,
I
OUT
=50mA(
Figure 2
)
60
dB
V
IN=VOUT(nom)
+ 0.2V,
f = 10 kHz,
I
OUT
=50mA(
Figure 2
)
40
I
Q
Quiescent Current VEN= 1.4V, I
OUT
= 0 mA 80 125
µAV
EN
= 1.4V, I
OUT
= 0 to 150 mA 110 150
V
EN
= 0.4V 0.005 1.2
Dropout Voltage (Note 10) I
OUT
=1mA 0.6 2.5
mV
I
OUT
=50mA 25 40
I
OUT
= 100 mA 50 80
I
OUT
= 150 mA 75 120
I
SC
Short Circuit Current Limit Output Grounded
(Steady State)
600
mA
I
OUT(PK)
Peak Output Current V
OUT
≥ V
OUT(nom)
- 5% 600 300 mA
T
ON
Turn-On Time
(Note 11)
20
µs
e
n
Output Noise Voltage BW = 10 Hz to 100 kHz,
C
OUT
= 1µF tant.
90 µVrms
I
EN
Maximum Input Current at EN VEN= 0.4 and VIN= 6.0
±
1nA
LP3984
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Electrical Characteristics (Continued)
Unless otherwise specified: VIN= 2.5V for 1.5, 1.8, & 2.0V options, VIN=V
OUT
+ 0.5 for output options higher than 2.5V, CIN=
1 µF, I
OUT
= 1mA, C
OUT
= 1 µF, tantalum. Typical values and limits appearing in standard typeface are for TJ= 25˚C. Limits
appearing in boldface type apply over the entire junction temperature range for operation, −40˚C to +125˚C. (Note 7) (Note 8)
Symbol Parameter Conditions Typ
Limit
Units
Min Max
V
IL
Maximum Low Level Input
Voltage at EN
VIN= 2.5 to 6.0V 0.4 V
V
IH
Minimum High Level Input
Voltage at EN
VIN= 2.5 to 6.0V 1.4 V
C
OUT
Output Capacitor Capacitance 1 22 µF
ESR 2 10 Ω
TSD
Thermal Shutdown Temperature 160 ˚C
Thermal Shutdown Hysteresis 20 ˚C
Note 1: AbsoluteMaximumRatings are limits beyond which damage to the device may occur.OperatingRatings 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: Additional information on lead temperature and pad temperature can be found in National Semiconductor Application Note (AN-1112).
Note 4: The Absolute Maximum power dissipation depends on the ambient temperature and can be calculated using the formula:
P
D
=(TJ-TA)/θJA,
where T
J
is the junction temperature, TAis the ambient temperature, and θJAis the junction-to-ambient thermal resistance. The 364mW rating for SOT23-5
appearing under Absolute Maximum Ratings results from substituting the Absolute Maximum junction temperature, 150˚C, for T
J
, 70˚C for TA, and 220˚C/W for θJA.
More power can be dissipated safely at ambient temperatures below 70˚C . Less power can be dissipated safely at ambient temperatures above 70˚C. The Absolute
Maximum power dissipation for SOT23-5 can be increased by 4.5mW for each degree below 70˚C, and it must be derated by 4.5mW for each degree above 70˚C.
Note 5: The human body model is 100pF discharged through 1.5kΩ resistor into each pin. The machine model is a 200 pF capacitor discharged directly into each
pin.
Note 6: Like the Absolute Maximum power dissipation, the maximum power dissipation for operation depends on the ambient temperature. The 250mW rating for
SOT23-5 appearing under Operating Ratings results from substituting the maximum junction temperature for operation, 125˚C, for T
J
, 70˚C for TA, and 220˚C/W for
θ
JA
into (Note 4) above. More power can be dissipated at ambient temperatures below 70˚C . Less power can be dissipated at ambient temperatures above 70˚C.
The maximum power dissipation for operation can be increased by 4.5mW for each degree below 70˚C, and it must be derated by 4.5mW for each degree above
70˚C.
Note 7: All limits are guaranteed. All electrical characteristics having room-temperature limits are tested during production with T
J
= 25˚C or correlated using
Statistical Quality Control (SQC) methods. All hot and cold limits are guaranteed by correlating the electrical characteristics to process and temperature variations
and applying statistical process control.
Note 8: The target output voltage, which is labeled V
OUT(nom)
, is the desired voltage option.
Note 9: An increase in the load current results in a slight decrease in the output voltage and vice versa.
Note 10: Dropout voltage is the input-to-output voltage difference at which the output voltage is 100mV below its nominal value. This specification does not apply
for input voltages below 2.5V.
Note 11: Turn-on time is time measured between the enable input just exceeding V
IH
and the output voltage just reaching 95% of its nominal value.
20020408
FIGURE 1. Output AC Line Regulation Input Perturbation
LP3984
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Typical Performance Characteristics Unless otherwise specified, C
IN=COUT
= 1 µF Tantalum, V
IN
= 2.5 for 1.5, 1.8, and 2.0V options, VIN=V
OUT
+ 0.2V for output options higher than 2.5V, TA= 25˚C, Enable pin is tied to
V
IN
.
Power Supply Rejection Ratio (V
IN
= 3.5V) Power Supply Rejection Ratio (VIN= 3.5V)
20020403 20020404
Power Supply Rejection Ratio (VIN= 3.5V) Power Supply Rejection Ratio (LP3984-1.5, VIN= 2.5V)
20020420 20020419
20020409
FIGURE 2. PSRR Input Perturbation
LP3984
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Typical Performance Characteristics Unless otherwise specified, C
IN=COUT
= 1 µF Tantalum, V
IN
= 2.5 for 1.5, 1.8, and 2.0V options, VIN=V
OUT
+ 0.2V for output options higher than 2.5V, TA= 25˚C, Enable pin is tied to
V
IN
. (Continued)
Line Transient Response (LP3984-3.1) Line Transient Response (LP3984-3.1)
20020418 20020417
Line Transient Response (LP3984-3.1) Line Transient Response (LP3984-3.1)
20020416 20020415
Line Transient Response (LP3984-3.1) Line Transient Response (LP3984-3.1)
20020414 20020413
LP3984
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Typical Performance Characteristics Unless otherwise specified, C
IN=COUT
= 1 µF Tantalum, V
IN
= 2.5 for 1.5, 1.8, and 2.0V options, VIN=V
OUT
+ 0.2V for output options higher than 2.5V, TA= 25˚C, Enable pin is tied to
V
IN
. (Continued)
Start Up Response Start Up Response
20020412 20020411
Enable Response Load Transient Response (LP3984-3.1
20020410 20020408
Load Transient Response (LP3984-3.1) Load Transient Response (VIN= 4.2V)
20020406 20020405
LP3984
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Application Hints
External Capacitors
Like any low-dropout regulator,the LP3984 requires external
capacitors for regulator stability. The LP3984 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 capacitance of ) 1µF is required between the
LP3984 input pin and ground (the amount of the capacitance
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 analog
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
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 on the input capacitor, but tolerance and temperature coefficient must be considered when selecting the capacitor to ensure the capacitance will be ) 1µF over the entire operating temperature
range.
Output Capacitor
The LP3984 is designed specifically to work with tantalum
output capacitors. A tantalum capacitor in 1 to 22 µF range
with 2Ω to 10Ω ESR range is suitable in the LP3984 application circuit.
It may also be possible to use film capacitors at the output,
but these are not as attractive for reasons of size and cost.
The output capacitor must meet the requirement for minimum amount of capacitance and also have an ESR (Equivalent Series Resistance) value which is within a stable range
(2Ω to 10Ω).
No-Load Stability
The LP3984 will remain stable and in regulation with no
external load. This is specially important in CMOS RAM
keep-alive applications.
On/Off Input Operation
The LP3984 is turned off by pulling the V
EN
pin low, and
turned on by pulling it high. If this feature is not used, the V
EN
pin should be tied to VINto keep the regulator output on at all
time. To assure proper operation, the signal source used to
drive the V
EN
input must be able to swing above and below
the specified turn-on/off voltage thresholds listed in the Electrical Characteristics section under V
IL
and VIH.
Fast On-Time
The LP3984 utilizes a speed up circuitry to ramp up the
internal V
REF
voltage to its final value to achieve a fast
output turn on time.
Micro SMD Mounting
The micro SMD package requires specific mounting techniques which are detailed in National Semiconductor Application Note (AN-1112). Referring to the section
Surface
Mount Technology (SMT) Assembly Considerations
,it
should be noted that the pad style which must be used with
the 5 pin package is NSMD (non-solder mask defined) type.
For best results during assembly, alignment ordinals on the
PC board may be used to facilitate placement of the micro
SMD device.
Micro SMD Light Sensitivity
Exposing the micro SMD device to direct sunlight will cause
misoperation of the device. Light sources such as Halogen
lamps can effect electrical performance if brought near to the
device.
The wavelengths which have most detrimental effect are
reds and infra-reds, which means that the fluorescent lighting used inside most buildings has very little effect on performance. A micro SMD test board was brought to within
1cm of a fluorescent desk lamp and the effect on the regulated output voltage was negligible, showing a deviation of
less than 0.1% from nominal.
LP3984
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Page 10
Physical Dimensions inches (millimeters)
unless otherwise noted
5-Lead Small Outline Package (MF)
NS Package Number MF05A
LP3984
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Page 11
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
Micro SMD, 4 Bump Package (BPA04)
NS Package Number bpa04DHC
X1 = 0.853
±
0.03mm
X2 = 0.955
±
0.03mm
X3 = 0.900
±
0.1mm
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DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL
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into the body, or (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.
2. A critical component is any component of a life
support device or system whose failure to perform
can be reasonably expected to cause the failure of
the life support device or system, or to affect its
safety or effectiveness.
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LP3984 Micropower, 150mA Ultra Low-Dropout CMOS Voltage Regulator in Subminiature 4-I/O
micro SMD Package
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.
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