MIC5271
µCap Negative Low Dropout Regulator
Features
General Description
• Stable with Ceramic or Tantalum Capacitors
• Standard Fixed Output Voltage Options: 3.0V and
5.0V
• Adjustable Output Voltage Option: (–1.2V to
–14V)
• Positive and Negative Enable Thresholds
• Low Dropout Voltage: –500 mV @ –100 mA
• Low Ground Current: –25 µA @ Load = –100 µA
• Tight Initial Accuracy: ±2%
• Tight Load and Line Regulation
• Thermal Shutdown and Current-Limit Protection
• IttyBitty 5-Pin SOT23 Packaging
• Zero-Current Off Mode
The MIC5271 is a µCap 100 mA negative regulator in
a SOT23-5 package. With better than 2% initial
accuracy, this regulator provides a very accurate
supply voltage for applications that require a negative
rail. The MIC5271 sinks 100 mA of output current at
very low dropout voltage (500 mV typical, 700 mV
maximum at 100 mA of output current).
Applications
•
•
•
•
•
GaAsFET Bias
Portable Cameras and Video Recorders
PDAs
Battery-Powered Equipment
Post-Regulation of DC/DC Converters
The µCap regulator design is optimized to work with
low-value, low-cost ceramic capacitors. The output
typically requires only a 1 µF capacitance for stability.
Designed for applications where small packaging and
efficiency are critical, the MIC5271 combines LDO
design expertise with IttyBitty packaging to improve
performance and reduce power dissipation. Ground
current is optimized to help improve battery life in
portable applications. The MIC5271 also includes a
TTL-compatible enable pin, allowing the user to put the
part into a zero-current off mode, in which the ground
current is only ±1 µA, typical.
The MIC5271 is available in the 5-pin SOT23 package
for space saving applications and it is available with an
adjustable output.
Package Types
MIC5271YM5
5-Lead SOT23 (M5)
Adjustable Output Voltage
(Top View)
MIC5271-5.0YM5 *
5-Lead SOT23 (M5)
Fixed Output Voltage
(Top View)
ADJ GND EN
1
2
3
NC GND EN
1
2
3
L9AA
L950
4
–OUT
5
–IN
4
–OUT
5
–IN
* 5.0V pinout shown. 3.0V version is identical.
Please see pin descriptions in Table 3-1.
2017 - 2022 Microchip Technology Inc. and its subsidiaries
DS20005881B-page 1
MIC5271
Typical Application Circuit
MIC5271
SOT23-5
R1
MIC5271YM5
2
GND
1
VIN
–6.0V
ADJ
R2
EN
5
–IN
–OUT
1μF
Functional Block Diagram
3
4
VOUT
–5.0V
10μF
MIC5271YM5
(Adjustable Version)
GND
+–
–
+
ADJ
EN
–IN
–OUT
MIC5271YM5
MIC5271-x.xYM5
(Fixed Version)
GND
+
+–
–
EN
–OUT
–IN
MIC5271-x.xYM5
DS20005881B-page 2
2017 - 2022 Microchip Technology Inc. and its subsidiaries
MIC5271
1.0
ELECTRICAL CHARACTERISTICS
Absolute Maximum Ratings †
Input Voltage (V–IN) ................................................................................................................................... –20V to +0.3V
Enable Voltage (VEN) .................................................................................................................................. –20V to +20V
Power Dissipation .................................................................................................................................. Internally Limited
ESD Rating .............................................................................................................................................................Note 1
Operating Ratings ‡
Input Voltage (V–IN) ................................................................................................................................... –16V to –3.3V
Enable Voltage (VEN) .................................................................................................................................. –16V to +16V
† Notice: Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device.
This is a stress rating only and functional operation of the device at those or any other conditions above those indicated
in the operational sections of this specification is not intended. Exposure to maximum rating conditions for extended
periods may affect device reliability.
‡ Notice: The device is not guaranteed to function outside its operating ratings.
Note 1: Devices are ESD sensitive. Handling precautions recommended.
2017 - 2022 Microchip Technology Inc. and its subsidiaries
DS20005881B-page 3
MIC5271
ELECTRICAL CHARACTERISTICS
Electrical Characteristics: V–IN = V–OUT – 1.0V; COUT = 4.7 µF, IOUT = 100 µA; TJ = +25°C, bold values indicate
–40°C ≤ TJ ≤ +125°C; unless otherwise noted. Note 1
Parameter
Min.
Typ.
Max.
–2
—
2
–3
—
3
ΔV–OUT/ΔT
—
100
—
Line Regulation
ΔV–OUT/
V–OUT
—
0.04
Load Regulation
ΔV–OUT/
V–OUT
—
0.4
—
–55
—
–360
Output Voltage Accuracy
Output Voltage Temperature
Coefficient
Dropout Voltage, Note 4
Ground Current, Note 5
Symbol
V–OUT
V–IN –
V–OUT
IGND
0.15
0.2
1.8
2.0
Units
%
ppm/°C
–500
—
–500
—
–25
—
–0.9
—
—
–2.0
–3.0
Note 2
V–IN = V–OUT – 1V to –16V
%
IOUT = –100 µA to –100 mA,
Note 3
IOUT = –100 µA
mV
IOUT = –50 mA
IOUT = –100 mA
–900
–100
Variation from nominal V–OUT.
%/V
—
–700
Conditions
µA
mA
IOUT = –100 µA
IOUT = –50 mA
IOUT = –100 mA
IGND_SD
–1.0
0.1
1.0
µA
VEN = ±0.6V
Ripple Rejection
PSRR
—
50
—
dB
f = 120 Hz
Current Limit
ILIMIT
—
235
350
mA
V–OUT = 0V
Turn-On Time
tON
—
60
—
µs
Time to VOUT = 90% (nominal)
—
—
±0.6
±2.0
—
—
Ground Current in Shutdown
Input Low Voltage
Input High Voltage
Enable Input Current
Note 1:
2:
3:
4:
5:
VEN
IEN
—
—
0.1
—
5.6
10.0
V
µA
Regulator OFF
Regulator ON
VEN = ±0.6V and –2.0V
VEN = +2.0V
Specification for packaged product only
Output voltage temperature coefficient is defined as the worst case voltage change divided by the total
temperature range.
Regulation is measured at constant junction temperature using low duty cycle pulse testing. Parts are
tested for load regulation in the load range from 100 µA to 100 mA. Changes in output voltage due to heating effects are covered by the thermal regulation specification.
Dropout voltage is defined as the input to output differential at which the output voltage drops 2% below its
nominal value measured at 1V differential.
Ground pin current is the regulator quiescent current plus pass transistor base current. The total current
drawn from the supply is the sum of the load current plus the ground pin current.
DS20005881B-page 4
2017 - 2022 Microchip Technology Inc. and its subsidiaries
MIC5271
TEMPERATURE SPECIFICATIONS (Note 1)
Parameters
Sym.
Min.
Typ.
Max.
Units
Conditions
Junction Temperature Range
TJ
–40
—
+125
°C
Storage Temperature Range
TS
–65
—
+150
°C
—
Lead Temperature
—
—
—
+260
°C
Soldering, 10s
JA
—
235
—
°C/W
Temperature Ranges
—
Package Thermal Resistances
Thermal Resistance SOT23-5
Note 1:
2:
—
The maximum allowable power dissipation is a function of ambient temperature, the maximum allowable
junction temperature and the thermal resistance from junction to air (i.e., TA, TJ, JA). Exceeding the
maximum allowable power dissipation will cause the device operating junction temperature to exceed the
maximum +125°C rating. Sustained junction temperatures above +125°C can impact the device reliability.
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 temperature is calculated using: PD(MAX) = (TJ(MAX) – TA) ÷ θJA, where
θJA is 235°C/W. Exceeding the maximum allowable power dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown. See the “Thermal Considerations” sub-section in the
Application Information for details.
2017 - 2022 Microchip Technology Inc. and its subsidiaries
DS20005881B-page 5
MIC5271
2.0
TYPICAL PERFORMANCE CURVES
Note:
The graphs and tables provided following this note are a statistical summary based on a limited number of
samples and are provided for informational purposes only. The performance characteristics listed herein
are not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified
operating range (e.g., outside specified power supply range) and therefore outside the warranted range.
-2.5
-3
GROUND CURRENT (mA)
OUTPUT VOLTAGE (V)
-3.5
0 LOAD
-2.5
-2
-1.5
-1
-0.5
0
-100mA LOAD
0
-1
-2
-3
-4
-2
-1.5
-1
-0.5
5VIN
0
-5
0
SUPPLY VOLTAGE (V)
FIGURE 2-1:
Dropout Characteristics.
FIGURE 2-4:
Current.
-80
GROUND CURRENT (μA)
-90
-3.3
OUTPUT VOLTAGE (V)
-3.305
-3.295
-3.29
-3.285
-3.28
-3.275
-3.27
-3.265
-3.26
0
-20
-40
-60
-80
Output Voltage vs. Output
-60
-80
-100
-1mA LOAD
-70
-60
-50
-100μA LOAD
-40
-30
-20
0μA LOAD
-10
0
-100
-40
Ground Current vs. Output
0
-1
-2
-3
-4
-5
SUPPLY VOLTAGE (V)
OUTPUT CURRENT (mA)
FIGURE 2-2:
Current.
-20
OUTPUT CURRENT (mA)
FIGURE 2-5:
Voltage.
Ground Current vs. Input
GROUND CURRENT (mA)
-2.5
-100mA LOAD
-2
-1.5
-50mA LOAD
-1
-10mA LOAD
-0.5
0
0
-1
-2
-3
-4
-5
SUPPLY VOLTAGE (V)
FIGURE 2-3:
Temperature.
DS20005881B-page 6
Output Voltage vs.
FIGURE 2-6:
Voltage.
Ground Current vs. Input
2017 - 2022 Microchip Technology Inc. and its subsidiaries
MIC5271
-1.6
-1mA LOAD
ENABLE THRESHOLD (V)
GROUND CURRENT (μA)
-30
-25
-20
0A LOAD
-15
-10
-5
0
-40 -20
0
20
40
60
ENABLE ON
-1.4
-1.2
-1
ENABLE OFF
-0.8
-0.6
-0.4
-0.2
0
-4
80 100 120
TEMPERATURE (°C)
FIGURE 2-7:
Temperature.
Ground Current vs.
-13
-16
FIGURE 2-10:
Negative Enable Threshold
vs. Supply Voltage.
DROPOUT VOLTAGE (mV)
GROUND CURRENT (μA)
-10
-600
-3.5
-3
-500
-2.5
-400
-100mA LOAD
-2
-300
-1.5
-200
-1
-0.5
-100
-50mA LOAD
0
-40 -20
0
20
40
60
FIGURE 2-8:
Temperature.
Ground Current vs.
FIGURE 2-11:
Current.
DROPOUT VOLTAGE (mV)
ENABLE ON
-350
-20
-40
-60
-80
-100
OUTPUT CURRENT (mA)
Dropout Voltage vs. Output
-10mA LOAD
-300
1.2
-250
1
ENABLE OFF
-200
0.8
-150
0.6
0A LOAD
-100
0.4
0.2
0
-4
0
-400
1.6
1.4
0
80 100 120
TEMPERATURE (°C)
ENABLE THRESHOLD (V)
-7
SUPPLY VOLTAGE (V)
-7
-10
-13
-16
SUPPLY VOLTAGE (V)
FIGURE 2-9:
Positive Enable Threshold
vs. Supply Voltage.
2017 - 2022 Microchip Technology Inc. and its subsidiaries
-50
0
-40 -20
0
20
40
60
80 100 120
TEMPERATURE (°C)
FIGURE 2-12:
Temperature.
Dropout Voltage vs.
DS20005881B-page 7
MIC5271
DROPOUT VOLTAGE (mV)
-700
-600
0V
-100mA LOAD
VOUT
(1V/div)
-500
-400
-50mA LOAD
-300
0V
-200
ENABLE
(1V/div)
-100
0
-40 -20
0
20
40
60
80 100 120
Time (20μs/div)
TEMPERATURE (°C)
FIGURE 2-13:
Temperature.
Dropout Voltage vs.
FIGURE 2-16:
Negative Enable Transient.
0V
VOUT
(AC-COUPLED)
(10mV/div)
VOUT
(1V/div)
–10mA
OUTPUT CURRENT -100mA
(50mA/div)
COUT = 1μF CERAMIC
VIN = –5V
VOUT = –3V
ENABLE
(1V/div)
0V
Time (2ms/div)
FIGURE 2-14:
Load Transient.
Time (20μs/div)
FIGURE 2-17:
Positive Enable Transient.
VOUT
(AC-COUPLED)
(10mV/div)
–10mA
OUTPUT CURRENT
(50mA/div)
–100mA
COUT = 1μF CERAMIC
VIN = –5V
VOUT = –3V
Time (2ms/div)
FIGURE 2-15:
DS20005881B-page 8
Load Transient.
2017 - 2022 Microchip Technology Inc. and its subsidiaries
MIC5271
3.0
PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 3-1.
TABLE 3-1:
PIN FUNCTION TABLE
Pin Number
Adjustable
Pin Number
Fixed
Pin Name
Description
1
1
EN
Enable Input. TTL logic-compatible enable input. Logic HIGH = ON,
Logic LOW or open = OFF.
2
2
GND
Ground.
3
—
ADJ
Adjustable (Input): Adjustable feedback output connects to resistor
voltage divider.
—
3
NC
No Connect. Leave unconnected.
4
4
–OUT
5
5
–IN
Negative Regulator Output.
Negative Supply Input.
2017 - 2022 Microchip Technology Inc. and its subsidiaries
DS20005881B-page 9
MIC5271
4.0
APPLICATION INFORMATION
ENABLE INPUT
The MIC5271 is a general-purpose negative voltage
regulator that can be used in a system that requires a
clean negative voltage. This includes the post
regulation of DC/DC converters (transformer or charge
pump based voltage converters). These negative
voltages typically require a negative low dropout
voltage regulator to provide a clean output from noisy
input power.
4
ENABLE VOLTAGE (V)
4.1
5
Input Capacitor
A 1 µF input capacitor should be placed from –IN to
GND if there is more than two inches of wire or trace
between the input and the AC filter capacitor or if a
battery is used as the input.
4.2
Low-ESR tantalums are recommended due to the tight
capacitance tolerance over temperature. The Z5U
dielectric can change capacitance value by as much
50% over temperature, and the Y5V dielectric can
change capacitance value by as much as 60% over
temperature. To use a ceramic chip capacitor with the
Y5V dielectric, the value must be much higher than a
tantalum to ensure the same minimum capacitor value
over temperature.
4.3
No-Load Stability
The MIC5271 does not require a load for stability.
4.4
Enable Input
The MIC5271 comes with an enable pin that allows the
regulator to be disabled. Forcing the enable pin higher
than the negative threshold and lower than the positive
threshold disables the regulator and sends it into a
“zero” off-mode current state. In this state, current
consumed by the regulator goes nearly to zero,
typically drawing only ±1 µA. The MIC5271 will be in
the “on” mode when the voltage applied to the enable
pin is either greater than the positive threshold or less
than the negative threshold.
DS20005881B-page 10
1
0
REGULATOR OFF
–1
–2
–3
REGULATOR ON
–4
–5
–3
Output Capacitor
The MIC5271 requires an output capacitor for stable
operation. A minimum of 1 µF of output capacitance is
required. The output capacitor can be increased
without limitation to improve transient response. The
output does not require ESR to maintain stability;
therefore a ceramic capacitor can be used. High-ESR
capacitors may cause instability. Capacitors with an
ESR of 3Ω or greater at 100 kHz can cause a
high-frequency oscillation.
REGULATOR ON
3
2
–5
–7
–9 –11 –13 –15
SUPPLY VOLTAGE (V)
FIGURE 4-1:
Positive and Negative
Enable Voltage vs. Supply Voltage.
4.5
Thermal Considerations
Absolute values will be used for thermal calculations to
clarify the meaning of power dissipation and voltage
drops across the part.
Proper thermal design for the MIC5271-5.0YM5 can be
accomplished with some basic design criteria and
some simple equations. The following information must
be known to implement your regulator design:
•
•
•
•
•
VIN = Input voltage
VOUT = Output voltage
IOUT = Output current
TA = Ambient operating temperature
IGND = Ground current
Maximum power dissipation can be determined by
knowing the ambient temperature (TA), the maximum
junction temperature (+125°C), and the thermal
resistance
(junction-to-ambient).
The
thermal
resistance for this part, assuming a minimum footprint
board layout, is +235°C/W. The maximum power
dissipation at an ambient temperature of +25°C can be
determined with Equation 4-1 and Equation 4-2:
2017 - 2022 Microchip Technology Inc. and its subsidiaries
MIC5271
4.6
EQUATION 4-1:
P D MAX
T J MAX – T A
= ------------------------------ JA
Adjustable Regulator Application
The MIC5271YM5 can be adjusted from –1.20V to
–14V by using two external resistors (Figure 4-2). The
resistors set the output voltage based on Equation 4-4.
5
–VIN
EQUATION 4-2:
1
2
125C – 25C
P D MAX = ----------------------------------- = 425mW
235C/W
The actual power dissipation of the regulator circuit can
be determined using Equation 4-3:
EQUATION 4-3:
MIC5271YM5
–IN
–OUT
4
R2
EN
GND
–VOUT
ADJ
3
R1
FIGURE 4-2:
Application.
Adjustable Voltage
EQUATION 4-4:
P D = V IN – V OUT I OUT + V IN I GND
V OUT = V REF 1 + R2
-------
R1
Substituting PD(MAX), determined above, for PD and
solving for the operating conditions that are critical to
the application will give the maximum operating
conditions for the regulator circuit. The maximum
power dissipation number cannot be exceeded for
proper operation of the device. The maximum input
voltage can be determined using the output voltage of
5.0V and an output current of 100 mA. Ground current,
of 2 mA for 100 mA of output current, can be taken from
Table .
•
•
•
•
Where:
VREF = 1.20V
425 mW = (VIN – 5.0V) x 100 mA + VIN x 2 mA
425 mW = (100 mA x VIN + 2 mA x VIN) – 500mW
925 mW = 102 mA x VIN
VIN = 9.07V (maximum)
Therefore, a –5.0V application at –100 mA of output
current can accept a maximum input voltage of –9.07V
in a SOT-23 package. For a full discussion of heat
sinking and thermal effects on voltage regulators, refer
to “Regulator Thermals” section of Microchip’s
Designing with Low Dropout Voltage Regulators
handbook and AN792, A Method to Determine How
Much Power an SOT23 Can Dissipate in an
Application.
2017 - 2022 Microchip Technology Inc. and its subsidiaries
DS20005881B-page 11
MIC5271
5.0
PACKAGING INFORMATION
5.1
Package Marking Information
5-Lead SOT-23*
(Front)
Example
XXXX
L930
5-Lead SOT-23*
(Back)
Example
NNN
Part Number
MIC5271YM5
G32
Output Voltage
Marking
Adjustable
L9AA
MIC5271-3.0YM5
–3.0V
L930
MIC5271-5.0YM5
–5.0V
L950
Legend: XX...X
Y
YY
WW
NNN
e3
*
Product code or customer-specific information
Year code (last digit of calendar year)
Year code (last 2 digits of calendar year)
Week code (week of January 1 is week ‘01’)
Alphanumeric traceability code
Pb-free JEDEC® designator for Matte Tin (Sn)
This package is Pb-free. The Pb-free JEDEC designator ( e3 )
can be found on the outer packaging for this package.
●, ▲, ▼ Pin one index is identified by a dot, delta up, or delta down (triangle
mark).
Note:
In the event the full Microchip part number cannot be marked on one line, it will
be carried over to the next line, thus limiting the number of available
characters for customer-specific information. Package may or may not include
the corporate logo.
Underbar (_) and/or Overbar (‾) symbol may not be to scale.
Note:
If the full seven-character YYWWNNN code cannot fit on the package, the following truncated codes are
used based on the available marking space:
6 Characters = YWWNNN; 5 Characters = WWNNN; 4 Characters = WNNN; 3 Characters = NNN;
2 Characters = NN; 1 Character = N
DS20005881B-page 12
2017 - 2022 Microchip Technology Inc. and its subsidiaries
MIC5271
5-Lead SOT-23 Package Outline and Recommended Land Pattern
Note:
For the most current package drawings, please see the Microchip Packaging Specification located at
http://www.microchip.com/packaging.
2017 - 2022 Microchip Technology Inc. and its subsidiaries
DS20005881B-page 13
MIC5271
NOTES:
DS20005881B-page 14
2017 - 2022 Microchip Technology Inc. and its subsidiaries
MIC5271
APPENDIX A:
REVISION HISTORY
Revision A (November 2017)
• Converted Micrel document MIC5271 to Microchip data sheet DS20005881A.
• Minor text changes throughout.
Revision B (February 2022)
• Updated the Package Marking Information drawing with the most current information.
2017 - 2022 Microchip Technology Inc. and its subsidiaries
DS20005881B-page 15
MIC5271
NOTES:
DS20005881B-page 16
2017 - 2022 Microchip Technology Inc. and its subsidiaries
MIC5271
PRODUCT IDENTIFICATION SYSTEM
To order or obtain information, e.g., on pricing or delivery, contact your local Microchip representative or sales office.
PART NO.
Device
-X.X
X
X
–XX
Output Junction Temp. Package Media Type
Voltage
Range
Device:
MIC5271:
Output Voltage:
= Adjustable
3.0 =
–3.0V Fixed Option
5.0 =
–5.0V Fixed Option
Junction
Temperature
Range:
Y
=
–40°C to +125°C, RoHS-Compliant
Package:
M5
=
5-Lead SOT23
Media Type:
TR
=
3,000/Reel
Note:
Examples:
a) MIC5271YM5-TR:
µCap Negative Low Dropout
Regulator, Adjustable Output
Voltage, –40°C to +125°C
Temp. Range, 5-Lead
SOT23, 3,000/Reel
b) MIC5271-3.0YM5-TR:
µCap Negative Low Dropout
Regulator, –3.0V Output
Voltage, –40°C to +125°C
Temp. Range, 5-Lead
SOT23, 3,000/Reel
c) MIC5271-5.0YM5-TR:
µCap Negative Low Dropout
Regulator, –5.0V Output
Voltage, –40°C to +125°C
Temp. Range, 5-Lead
SOT23, 3,000/Reel
µCap Negative Low Dropout Regulator
Contact Marketing for other output voltage options.
2017 - 2022 Microchip Technology Inc. and its subsidiaries
Note 1:
Tape and Reel identifier only appears in the
catalog part number description. This identifier is
used for ordering purposes and is not printed on
the device package. Check with your Microchip
Sales Office for package availability with the
Tape and Reel option.
DS20005881B-page 17
MIC5271
NOTES:
DS20005881B-page 18
2017 - 2022 Microchip Technology Inc. and its subsidiaries
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•
Microchip products meet the specifications contained in their particular Microchip Data Sheet.
•
Microchip believes that its family of products is secure when used in the intended manner, within operating specifications, and
under normal conditions.
•
Microchip values and aggressively protects its intellectual property rights. Attempts to breach the code protection features of
Microchip product is strictly prohibited and may violate the Digital Millennium Copyright Act.
•
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Trademarks
The Microchip name and logo, the Microchip logo, Adaptec,
AnyRate, AVR, AVR logo, AVR Freaks, BesTime, BitCloud,
CryptoMemory, CryptoRF, dsPIC, flexPWR, HELDO, IGLOO,
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GestIC is a registered trademark of Microchip Technology Germany
II GmbH & Co. KG, a subsidiary of Microchip Technology Inc., in
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© 2017 - 2022, Microchip Technology Incorporated and its subsidiaries.
All Rights Reserved.
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2017 - 2022 Microchip Technology Inc. and its subsidiaries
ISBN: 978-1-5224-9871-1
DS20005881B-page 19
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09/14/21
