TI1 LP2985AITPX-1.5 Micropower 150 ma low-noise low-dropout regulator in sot-23 and micro smd packages for applications with output voltages 2.0v designed for use with very low eesr output capacitor Datasheet

LP2985LV
LP2985LV Micropower 150 mA Low-Noise Low-Dropout Regulator in SOT-23 and
micro SMD packages for Applications with Output Voltages 2.0V Designed
for Use with Very Low EESR Output Capacitors
Literature Number: SNOS510O
LP2985LV
Micropower 150 mA Low-Noise Low-Dropout Regulator in
SOT-23 and micro SMD packages for Applications with
Output Voltages ≤ 2.0V
Designed for Use with Very Low ESR Output Capacitors
General Description
Features
The LP2985LV is a 150 mA, fixed-output voltage regulator
designed to providehigh performance and low noise in applications requiring output voltages ≤ 2.0V.
Using an optimized VIP® (Vertically Integrated PNP) process,
the LP2985LV delivers unequalled performance in all specifications critical to battery-powered designs:
Ground Pin Current: Typically 825 µA @ 150 mA load, and
75 µA @ 1 mA load.
Enhanced Stability: The LP2985LV is stable with output capacitor ESR as low as 5 mΩ, which allows the use of ceramic
capacitors on the output.
Sleep Mode: Less than 1 µA quiescent current when ON/OFF
pin is pulled low.
Smallest Possible Size: micro SMD package uses absolute
minimum board space.
Precision Output: 1% tolerance output voltages available (A
grade).
Low Noise: By adding a 10 nF bypass capacitor, output noise
can be reduced to 30 µV (typical).
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■
■
■
■
■
■
■
■
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Guaranteed 150 mA output current
Smallest possible size (micro SMD)
Requires minimum external components
Stable with low-ESR output capacitor
<1 µA quiescent current when shut down
Low ground pin current at all loads
Output voltage accuracy 1% (A Grade)
High peak current capability
Wide supply voltage range (16V max)
Low ZOUT: 0.3Ω typical (10 Hz to 1 MHz)
Overtemperature/overcurrent protection
−40°C to +125°C junction temperature range
Custom voltages available
Applications
■
■
■
■
Cellular Phone
Palmtop/Laptop Computer
Personal Digital Assistant (PDA)
Camcorder, Personal Stereo, Camera
Block Diagram
10129501
VIP® is a registered trademark of National Semiconductor Corporation.
© 2010 National Semiconductor Corporation
101295
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LP2985LV Micropower 150 mA Low-Noise Low-Dropout Regulator in SOT-23 and micro SMD
packages for Applications with Output Voltages ≤ 2.0V
September 9, 2010
LP2985LV
Basic Application Circuit
10129502
*ON/OFF input must be actively terminated. Tie to VIN if this function is not to be used.
**Minimum capacitance is shown to ensure stability (may be increased without limit). Ceramic capacitor required for output (see Application Hints).
***Reduces output noise (may be omitted if application is not noise critical). Use ceramic or film type with very low leakage current (see Application Hints).
Connection Diagrams
SOT-23, 5-Lead Small Outline Package (M5)
micro SMD, 5 Bump Package
10129503
Top View
See NS Package Number MF05A
10129523
Note: The actual physical placement of the package marking will vary from part
to part. Package marking contains date code and lot traceability information, and
will vary considerably. Package marking does not correlate to device type.
Top View
Pin Descriptions
Name
Pin Number
SOT-23
micro SMD
Function
VIN
1
C3
Input Voltage
GND
2
A1
Common Ground (device substrate)
ON/OFF
3
A3
Logic high enable input
BYPASS
4
B2
Bypass capacitor for low noise operation
VOUT
5
C1
Regulated output voltage
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LP2985LV
Ordering Information
TABLE 1. Package Marking and Ordering Information
Output Voltage (V)
Grade
Order Information
Package Marking
Supplied as:
SOT-23, 5-Lead Small Outline Package (M5)
A
1.5
STD
A
1.8
STD
A
2.0
STD
LP2985AIM5-1.5
LCHA
1000 Units on Tape and Reel
LP2985AIM5X-1.5
LCHA
3000 Units on Tape and Reel
LP2985IM5-1.5
LCHB
1000 Units on Tape and Reel
LP2985IM5X-1.5
LCHB
3000 Units on Tape and Reel
LP2985AIM5-1.8
LAYA
1000 Units on Tape and Reel
LP2985AIM5X-1.8
LAYA
3000 Units on Tape and Reel
LP2985IM5-1.8
LAYB
1000 Units on Tape and Reel
LP2985IM5X-1.8
LAYB
3000 Units on Tape and Reel
LP2985AIM5-2.0
LCDA
1000 Units on Tape and Reel
LP2985AIM5X-2.0
LCDA
3000 Units on Tape and Reel
LP2985IM5-2.0
LCDB
1000 Units on Tape and Reel
LP2985IM5X-2.0
LCDB
3000 Units on Tape and Reel
micro SMD, 5 Bump Package (TPA05 - 170 µm ball)
A
1.5
STD
A
1.8
STD
LP2985AITP-1.5
250 Units on Tape and Reel
LP2985AITPX-1.5
3000 Units on Tape and Reel
LP2985ITP-1.5
250 Units on Tape and Reel
LP2985ITPX-1.5
3000 Units on Tape and Reel
LP2985AITP-1.8
250 Units on Tape and Reel
LP2985AITPX-1.8
3000 Units on Tape and Reel
LP2985ITP-1.8
250 Units on Tape and Reel
LP2985ITPX-1.8
3000 Units on Tape and Reel
3
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LP2985LV
Power Dissipation (Note 3)
Input Supply Voltage (Survival)
Input Supply Voltage (Operating)
Shutdown Input Voltage (Survival)
Output Voltage (Survival, (Note 4))
IOUT (Survival)
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Storage Temperature Range
Operating Junction Temperature
Range
Lead Temp. (Soldering, 5 sec.)
ESD Rating (Note 2)
−65°C to +150°C
−40°C to +125°C
260°C
2 kV
Internally Limited
−0.3V to +16V
2.2V to +16V
−0.3V to +16V
−0.3V to +9V
Short Circuit
Protected
−0.3V to +16V
Input-Output Voltage (Survival,
(Note 5))
Electrical Characteristics
(Note 10)
Limits in standard typeface are for TJ = 25°C. and limits in boldface type apply over the full operating temperature range. Unless
otherwise specified: VIN = VO(NOM) + 1V, IL = 1 mA, CIN = 1 µF, COUT = 4.7 µF, VON/OFF = 2V.
Symbol
ΔVO
LP2985AI-X.X
(Note 6)
LP2985I-X.X
(Note 6)
Min
Max
Min
Max
IL = 1 mA
−1.0
1.0
−1.5
1.5
1 mA ≤ IL ≤ 50 mA
−1.5
1.5
−2.5
2.5
−2.5
2.5
−3.5
3.5
−2.5
2.5
−3.0
3.0
3.5
−4.0
Parameter
Output Voltage
Tolerance
Conditions
Typ
1 mA ≤ IL ≤ 150 mA
−3.5
Output Voltage
VO(NOM)+1V ≤ VIN ≤ 16V
0.007
Line Regulation
IGND
Ground Pin Current
IL = 0
65
IL = 1 mA
VIN(min)
VIN - VOUT
VON/OFF
ION/OFF
en
75
0.032
0.032
95
95
125
125
110
110
170
170
220
220
400
400
IL = 50 mA
300
500
500
900
900
IL = 150 mA
825
1200
1200
2000
2000
VON/OFF < 0.3V
0.01
0.8
0.8
VON/OFF < 0.15V
0.05
2
2
2.05
2.20
2.20
IL = 50mA
120
150
250
150
250
IL = 150mA
280
350
600
350
600
ON/OFF Input Voltage
(Note 7)
High = O/P ON
1.4
Low = O/P OFF
0.55
0.15
0.15
ON/OFF Input Current
VON/OFF = 0
Output Noise
Voltage (RMS)
1.6
1.6
0.01
−2
−2
VON/OFF = 5V
5
15
15
BW = 300 Hz to 50 kHz,
COUT = 10 µF
30
CBYPASS = 10 nF
VOUT = 1.8V
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0.014
120
Dropout Voltage
(Note 9)
4
%VNOM
4.0
0.014
IL = 10 mA
Minimum Input Voltage
Required To maintain
Output Regulation
(Note 9)
Units
%/V
µA
V
mV
V
µA
µV
Parameter
Ripple Rejection
Conditions
Typ
f = 1 kHz, CBYPASS = 10 nF
COUT = 10 µF
IO(SC)
Short Circuit Current
RL = 0 (Steady State)
(Note 8)
IO(PK)
Peak Output Current
VOUT ≥ Vo(NOM) −5%
LP2985I-X.X
(Note 6)
Min
Min
Max
Units
Max
45
dB
400
mA
350
mA
Note 1: “Absolute Maximum Ratings” indicate limits beyond which damage to the component may occur. Electrical specifications do not apply when operating
the device outside of its rated operating conditions.
Note 2: The ESD rating of pins 3 and 4 for the SOT-23 package, or pins 5 and 2 for the micro SMD package, is 1 kV.
Note 3: The maximum allowable power dissipation is a function of the maximum junction temperature, TJ(MAX), the junction-to-ambient thermal resistance, θJA, and the ambient temperature, TA. The maximum allowable power dissipation at any ambient temperture is calculated using:
Where the value of θJ-A for the SOT-23 package is 220°C/W in a typical PC board mounting. Exceeding the maximum allowable dissipation will cause excessive
die temperature, and the regulator will go into thermal shutdown.
Note 4: If used in a dual-supply system where the regulator load is returned to a negative supply, the LP2985LV output must be diode-clamped to ground.
Note 5: The output PNP structure contains a diode between the VIN to VOUT terminals that is normally reverse-biased. Reversing the polarity from VIN to VOUT
will turn on this diode, and possibly damage the device (See Application Hints).
Note 6: Limits are 100% production tested 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 Average Outgoing Quality Level (AOQL).
Note 7: The ON/OFF input must be properly driven to prevent possible misoperation. For details, refer to Application Hints.
Note 8: The LP2985LV has foldback current limiting which allows a high peak current when VOUT > 0.5V, and then reduces the maximum output current as
VOUT is forced to ground (see Typical Performance Characteristics curves).
Note 9: VIN must be the greater of 2.2V or VOUT(NOM) + Dropout Voltage to maintain output regulation. Dropout Voltage is defined as the input to output differential
at which the output voltage drops 2% below ther value measured with a 1V differential.
Note 10: Exposing the micro SMD device to direct sunlight will cause misoperation. See Application Hints for additional information.
5
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LP2985LV
Symbol
LP2985AI-X.X
(Note 6)
LP2985LV
Typical Performance Characteristics Unless otherwise specified: CIN = 1µF, COUT = 4.7µF,
VIN = VOUT(NOM) +1, VOUT = 1.8V, TA = 25°C, ON/OFF pin is tied to VIN
VOUT vs Temperature
Short-Circuit Current
10129516
10129507
Short-Circuit Current
Short-Circuit Current vs Output Voltage
10129517
10129518
Ripple Rejection
COUT = 4.7µF, Bypass = 10nF
Ripple Rejection
COUT = 4.7µF, No Bypass
10129525
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10129526
6
LP2985LV
Output Impedance vs Frequency
Output Impedance vs Frequency
10129527
10129532
Noise Density
Noise Density
10129533
10129537
Ground Pin vs Load Current
Minimum Input Voltage vs Temperature
10129513
10129509
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LP2985LV
Minimum Input Voltage vs Temperature
Input Current vs VIN
10129541
10129510
Input Current vs VIN
Input Current vs VIN
10129511
10129512
Ground Pin Current vs Temperature
Instantaneous Short Circuit Current
10129515
10129514
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LP2985LV
Output Characteristics
Load Transient
10129542
10129508
Load Transient
Load Transient
10129543
10129544
Line Transient
Line Transient
10129545
10129546
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LP2985LV
Line Transient
Line Transient
10129547
10129548
Turn-On Time
Turn-On Time
10129549
10129552
Turn-On Time
Turn-On Time
10129550
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10129551
10
LP2985LV
Application Hints
EXTERNAL CAPACITORS
Like any low-dropout regulator, the LP2985LV requires external capacitors for regulator stability. These capacitors must
be correctly selected for good performance.
Input Capacitor
An input capacitor whose capacitance is ≥ 1 µF is required
between the LP2985LV input and ground (the amount of capacitance may be increased without limit).
This capacitor must be located a distance of not more than 1
cm 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 failure due to surge current when connected to a low-impedance
source of power (like a battery or 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 ESR on the input capacitor, but
tolerance and temperature coefficient must be considered
when selecting the capacitor to ensure the capacitance will
be ≥ 1 µF over the entire operating temperature range.
10129520
FIGURE 2. LP2985LV 4.7µF Stable ESR Range
Important: The output capacitor must maintain its ESR within
the stable region over the full operating temperature range of
the application to assure stability.
The LP2985LV requires a minimum of 2.2 µF on the output
(output capacitor size can be increased without limit).
It is important to remember that capacitor tolerance and variation with temperature must be taken into consideration when
selecting an output capacitor so that the minimum required
amount of output capacitance is provided over the full operating temperature range. It should be noted that ceramic
capacitors can exhibit large changes in capacitance with temperature (see next section, Capacitor Characteristics).
The output capacitor must be located not more than 1 cm from
the output pin and returned to a clean analog ground.
Output Capacitor
The LP2985LV is designed specifically to work with ceramic
output capacitors, utilizing circuitry which allows the regulator
to be stable across the entire range of output current with an
output capacitor whose ESR is as low as 5 mΩ. It may also
be possible to use Tantalum or film capacitors at the output,
but these are not as attractive for reasons of size and cost
(see next sectionCapacitor Characteristics).
The output capacitor must meet the requirement for minimum
amount of capacitance and also have an ESR (equivalent series resistance) value which is within the stable range. Curves
are provided which show the stable ESR range as a function
of load current (see ESR graphs Figure 1 and Figure 2).
Noise Bypass Capacitor
Connecting a 10 nF capacitor to the Bypass pin significantly
reduces noise on the regulator output. It should be noted that
the capacitor is connected directly to a high-impedance circuit
in the bandgap reference.
Because this circuit has only a few microamperes flowing in
it, any significant loading on this node will cause a change in
the regulated output voltage. For this reason, DC leakage
current through the noise bypass capacitor must never exceed 100 nA, and should be kept as low as possible for best
output voltage accuracy.
The types of capacitors best suited for the noise bypass capacitor are ceramic and film. High-quality ceramic capacitors
with either NPO or COG dielectric typically have very low
leakage. 10 nF polypropolene and polycarbonate film capacitors are available in small surface-mount packages and typically have extremely low leakage current.
CAPACITOR CHARACTERISTICS
The LP2985LV was designed to work with ceramic capacitors
on the output to take advantage of the benefits they offer: for
capacitance values in the 2.2 µF to 4.7 µF range, ceramics
are the least expensive and also have the lowest ESR values
(which makes them best for eliminating high-frequency
noise). The ESR of a typical 2.2 µF ceramic capacitor is in the
range of 10 mΩ to 20 mΩ, which easily meets the ESR limits
required for stability by the LP2985LV.
10129519
FIGURE 1. LP2985LV 2.2µF Stable ESR Range
11
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LP2985LV
One disadvantage of ceramic capacitors is that their capacitance can vary with temperature. Most large value ceramic
capacitors (≥ 2.2 µF) are manufactured with the Z5U or Y5V
temperature characteristic, which results in the capacitance
dropping by more than 50% as the temperature goes from 25°
C to 85°C.
This could cause problems if a 2.2 µF capacitor were used on
the output since it will drop down to approximately 1 µF at high
ambient temperatures (which could cause the LP2985LV to
oscillate). If Z5U or Y5V capacitors are used on the output, a
minimum capacitance value of 4.7 µF must be observed.
A better choice for temperature coefficient in ceramic capacitors is X7R, which holds the capacitance within ±15%. Unfortunately, the larger values of capacitance are not offered
by all manufacturers in the X7R dielectric.
10129554
FIGURE 3. Reverse Current Parth
However, if the output is pulled above the input, this diode will
turn ON and current will flow into the regulator output. In such
cases, a parasitic SCR can latch which will allow a high current to flow into VIN (and out the ground pin), which can
damage the part.
In any application where the output may be pulled above the
input, an external Schottky diode must be connected from
VIN to VOUT (cathode on VIN, anode on VOUT), to limit the reverse voltage across the LP2985LV to 0.3V (see Absolute
Maximum Ratings).
Tantalum
Tantalum capacitors are less desirable than ceramics for use
as output capacitors because they are more expensive when
comparing equivalent capacitance and voltage ratings in the
1 µF to 4.7 µF 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 Tantalum will
increase about 2:1 as the temperature goes from 25°C down
to −40°C, so some guard band must be allowed.
On/Off Input Operation
The LP2985LV is shut off by driving the ON/OFF input low,
and turned on by pulling it high. If this feature is not to be used,
the ON/OFF input should be tied to VIN to keep the regulator
output on at all times.
To assure proper operation, the signal source used to drive
the ON/OFF input must be able to swing above and below the
specified turn-on/turn-off voltage thresholds listed in the Electrical Characteristics section under VON/OFF. To prevent misoperation, the turn-on (and turn-off) voltage signals applied to
the ON/OFF input must have a slew rate which is
≥ 40 mV/µs.
Caution: the regulator output voltage can not be guaranteed
if a slow-moving AC (or DC) signal is applied that is in the
range between the specified turn-on and turn-off voltages listed under the electrical specification VON/OFF (see Electrical
Characteristics).
10129555
FIGURE 4. Reverse Current Protection
MICRO SMD MOUNTING
The micro SMD package requires specific mounting techniques which are detailed in National Semiconductor Application Note # 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 the 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.
REVERSE INPUT-OUTPUT VOLTAGE
The PNP power transistor used as the pass element in the
LP2985LV has an inherent diode connected between the regulator output and input. During normal operation (where the
input voltage is higher than the output) this diode is reversebiased.
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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 also affect electrical performance if brought near
to the device.
The wavelengths which have the 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 1 cm
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.
12
LP2985LV
Physical Dimensions inches (millimeters) unless otherwise noted
SOT-23, 5-Lead Small Outline Package (M5)
NS Package Number MF05A
13
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LP2985LV
NOTES: UNLESS OTHERWISE SPECIFIED
1. EPOXY COATING
2. RECOMMEND NON-SOLDER MASK DEFINED LANDING PAD.
3. PIN 1 IS ESTABLISHED BY LOWER LEFT CORNER WITH RESPECT TO TEXT ORIENTATION. REMAINING PINS ARE NUMBERED COUNTER CLOCKWISE.
4. XXX IN DRAWING NUMBER REPRESENTS PACKAGE SIZE VARIATION WHERE X1 IS PACKAGE WIDTH, X2 IS PACKAGE LENGTH AND X3 IS PACKAGE HEIGHT.
5. NO JEDEC REGISTRATION AS OF AUG.1999.
micro SMD, 5 Bump, Package (TPA05 - 170 µm ball)
NS Package Number TPA05
The dimensions for X1, X2 and X3 are as given:
X1 = 0.930 +/− 0.030mm
X2 = 1.107 +/− 0.030mm
X3 = 0.500 +/− 0.075mm
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LP2985LV
Notes
15
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LP2985LV Micropower 150 mA Low-Noise Low-Dropout Regulator in SOT-23 and micro SMD
packages for Applications with Output Voltages ≤ 2.0V
Notes
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www.ti.com/audio
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amplifier.ti.com
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www.ti.com/computers
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dataconverter.ti.com
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www.dlp.com
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www.ti.com/energy
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dsp.ti.com
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logic.ti.com
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power.ti.com
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Microcontrollers
microcontroller.ti.com
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www.ti-rfid.com
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www.ti.com/omap
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www.ti.com/wirelessconnectivity
TI E2E Community Home Page
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e2e.ti.com
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