MPS MP8902DG-2.5 Low dropout 250ma linear regulator Datasheet

MP8902
Low Dropout
250mA Linear Regulator
DESCRIPTION
FEATURES
The MP8902 is a low-noise, low-dropout linear
regulator. It operates from 2.7V to 6.5V input
voltage, and regulates the output voltage with
2% accuracy at 2.5V, 3.3V, or from 1.25V to 5V.



The MP8902 can supply up to 250mA of load
current. The MP8902 features thermal overload
protection. It is available in a 2mm x 2mm 8-pin
QFN package.



FIXED VOLTAGE PART NUMBERS
Part Number
Output Voltage
MP8902DG–2.5
MP8902DG–3.3
2.5V
3.3V




Low 250mV Dropout at 250mA Output
2% Accurate Output Voltage
Fixed Output Voltage Options of 2.5V or
3.3V
Adjustable Output Voltage Option from
1.25V to 5V using an External Resistor
Divider
Up to 6.5V Input Voltage
High PSRR
o 70dB at 1kHz
o 30dB at 1MHz
Better Than 0.001%/mA Load Regulation
Stable With Low-ESR Output Capacitor
Low 125μA Ground Current
Internal Thermal Protection
APPLICATIONS



802.11 PC Cards
Mobile Handset PLL Power
Audio Codec Power
All MPS parts are lead-free, halogen free, and adhere to the RoHS directive. For
MPS green status, please visit MPS website under Quality Assurance. “MPS”
and “The Future of Analog IC Technology” are Registered Trademarks of
Monolithic Power Systems, Inc.
TYPICAL APPLICATION
MP8902 Rev. 1.0
9/4/2017
www.MonolithicPower.com
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© 2017 MPS. All Rights Reserved.
1
MP8902 – LOW DROPOUT, 250mA LINEAR REGULATOR
ORDERING INFORMATION
Part Number*
Package
MP8902DG–2.5
QFN8 (2x2)
Part Number**
Package
MP8902DG–3.3
QFN8 (2x2)
Top Marking
Temperature
Top Marking
–40C to +85C
Temperature
–40C to +85C
* For Tape & Reel, add suffix –Z (e.g. MP8902DG–2.5–Z).
For RoHS compliant packaging, add suffix –LF (e.g. MP8902DG–2.5–LF–Z)
** For Tape & Reel, add suffix –Z (e.g. MP8902DG–3.3–Z).
For RoHS compliant packaging, add suffix –LF (e.g. MP8902DG–3.3–LF–Z)
PACKAGE REFERENCE
ABSOLUTE MAXIMUM RATINGS (1)
IN Supply Voltage ...................... –0.3V to +7.0V
FB Voltage ........................ –0.3V to VOUT + 0.3V
All Other Pins ................................ –0.3V to +6V
(2)
Continuous Power Dissipation (TA = +25°C)
………………………………………………....1.6W
Junction Temperature .............................. 150C
Lead Temperature ................................... 260C
Storage Temperature ............. –65°C to +150C
Recommended Operating Conditions
(3)
Input Voltage ................................. 2.7V to 6.5V
Output Voltage ................................ 1.25V to 5V
Load Current.......................... 250mA Maximum
Operating Temperature............. –40C to +85C
MP8902 Rev. 1.0
9/4/2017
Thermal Resistance
(4)
θJA
θJC
QFN8 (2x2) ............................. 80 ...... 16 ... C/W
Notes:
1) Exceeding these ratings may damage the device.
2) The maximum allowable power dissipation is a function of the
maximum junction temperature TJ (MAX), the junction-toambient thermal resistance θJA, and the ambient temperature
TA. The maximum allowable continuous power dissipation at
any ambient temperature is calculated by PD (MAX) = (TJ
(MAX)-TA)/θJA. Exceeding the maximum allowable power
dissipation will cause excessive die temperature, and the
regulator will go into thermal shutdown. Internal thermal
shutdown circuitry protects the device from permanent
damage.
3) The device is not guaranteed to function outside of its
operating conditions.
4) Measured on approximately 1” square of 1 oz copper.
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2
MP8902 – LOW DROPOUT, 250mA LINEAR REGULATOR
ELECTRICAL CHARACTERISTICS
VIN = 5V, TA = +25C, unless otherwise noted.
Parameter
Operating Voltage
Output Voltage Accuracy
Ground Pin Current
Shutdown Current
FB Regulation Voltage
Dropout Voltage
(6)
Line Regulation
Load Regulation
PSRR
Output Voltage Noise
EN Input High Voltage
EN Input Low Voltage
EN Input Bias Current
Thermal Protection
Thermal Protection Hysteresis
Symbol Condition
IOUT = 1mA
IOUT = 1mA, VOUT = 1.25V to 5V
IOUT = 1mA–250mA
VEN = 0V, VIN = 5V
–40C  TA  +85C
VOUT = 3V
IOUT = 250mA
VOUT = 4V
IOUT
=
1mA,
(7)
VIN = (VOUT + 0.5V) to 6.5V
IOUT
=
1mA
to
250mA,
(7)
VIN = VOUT + 0.5V
VIN > VOUT +0.5V, COUT = 2.2μF,
VIN(AC) = 100mV, f = 1kHz
VIN > VOUT + 0.5V, COUT = 2.2μF,
VIN(AC) = 100mV, f = 1MHz
f = 1kHz, CFB > 0.1μF, IOUT = 1mA
Min
2.7
2.0
1.197
1.194
Typ
(5)
±1.0
125
0.1
1.222
1.222
230
190
Max
6.5
2.0
155
1
1.246
1.249
V
mV
0.005
0.08
%/V
0.001
0.02
%/mA
70
dB
30
dB
300
1.5
0.4
VEN = 0V, 5V
Units
V
%
μA
μA
0.01
155
30
1
nV/√Hz
V
V
μA
C
C
Notes:
5) Parameter is guaranteed by design, not production tested.
6) Dropout Voltage is defined as the input to output differential when the output voltage drops 1% below its normal value.
7) VIN = 2.7V for VOUT = 1.25V to 2.2V
MP8902 Rev. 1.0
9/4/2017
www.MonolithicPower.com
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© 2017 MPS. All Rights Reserved.
3
MP8902 – LOW DROPOUT, 250mA LINEAR REGULATOR
TYPICAL PERFORMANCE CHARACTERISTICS
VIN = 4.5V, VOUT = 2.85V, C1 = 1μF, C2 = 0.1μF, C3 = 2.2μF, TA = +25C unless otherwise noted.
MP8902 Rev. 1.0
9/4/2017
www.MonolithicPower.com
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© 2017 MPS. All Rights Reserved.
4
MP8902 – LOW DROPOUT, 250mA LINEAR REGULATOR
PIN FUNCTIONS
Pin #
Name
1, 2
OUT
3
FB
4
5
6
7, 8
Description
Regulator Output. OUT is the output of the linear regulator. Bypass OUT to GND with a 1μF
or greater capacitor.
Feedback Input. Connect a resistive voltage divider from OUT to FB to set the output
voltage. OUT feedback threshold is 1.222V.
GND,
Exposed The exposed pad and GND pin must be connected to the same ground plane.
Pad
Enable Input. Drive EN high to turn on the MP8902, drive EN low to turn it off. For automatic
EN
startup, connect EN to IN.
NC
No Connect.
Power Source Input. IN supplies the internal power to the MP8902 and is the source of the
IN
pass transistor. Bypass IN to GND with a 1μF or greater capacitor.
OPERATION
The MP8902 is a low-current, low-noise,
high-PSRR, low-dropout, linear regulator. It is
intended for use in devices that require very low
noise power supplies and high-PSRR such as
PLL VCO supplies for mobile handsets and
802.11 PC Cards, as well as audio codecs and
microphones. The MP8902 uses a PMOS pass
element and features internal thermal shutdown.
As shown in Figures 1 and 2, optional feedforward capacitor CBYP may be added between
FB and OUT pins for an improved transient
response.
Figure 1—Ultra-Low-Noise Fixed Output Regulator
Figure 2—Ultra-Low-Noise Adjustable Regulator: VOUT = VFB(1+(R1/R2))
MP8902 Rev. 1.0
9/4/2017
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© 2017 MPS. All Rights Reserved.
5
MP8902 – LOW DROPOUT, 250mA LINEAR REGULATOR
APPLICATION INFORMATION
SETTING THE OUTPUT VOLTAGE
The fixed output voltage of the MP8902DG is set
to 2.5V or 3.3V, depending on the internal
resistor divider (Figure 1). You can also adjust
the output voltage by using an external resistor
divider (R1 and R2 in Figure 2). However, the
sum of R1 and R2 should not exceed 100kΩ to
minimize the impact of the internal resistor
divider. For accurate output-voltage setting, it is
suggested to use 10kΩ (1%) for the low-side
resistor R2 of the voltage divider, the high side
resistor R1 can be determined by the equation:
V
 VFB
R1  R2   OUT
VFB




Where VFB is the OUT feedback threshold
voltage equal to 1.222V.
Example: For 2.5V Output
2.5V  1.222V
R1 
 10.41k
 1.222V 


 10k 
MP8902 Rev. 1.0
9/4/2017
You can select a standard 10.5kΩ (1%)
resistor for R1.
The following table lists the selected R1 values
for some typical output voltages:
Table 1—Adjustable Output Voltage R1 Values
VOUT (V)
R1 (Ω)
1.25
232
1.5
2.26k
1.8
4.75k
2
6.34k
2.5
10.5k
2.8
13k
3
14.7k
3.3
16.9k
4
22.6k
5
30.9k
In Figures 3 and 4, C2 is added for an improved
transient response.
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© 2017 MPS. All Rights Reserved.
6
MP8902 – LOW DROPOUT, 250mA LINEAR REGULATOR
TYPICAL APPLICATION CIRCUIT
Figure 3—Typical Application Circuit (Fixed)
Figure 4—Typical Application Circuit (Adjustable)
MP8902 Rev. 1.0
9/4/2017
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2017 MPS. All Rights Reserved.
7
MP8902 – LOW DROPOUT, 250mA LINEAR REGULATOR
PCB layout guide
PCB layout is very important to achieve good regulation, ripple rejection, transient response and
thermal performance. It is highly recommended to duplicate EVB layout for optimum performance. If
change is necessary, please follow these guidelines and take figure 5 for reference.
1)
Input and output bypass ceramic capacitors are suggested to be put close to the IN Pin and OUT
Pin respectively.
2)
Ensure all feedback connections are short and direct. Place the feedback resistors and
compensation components as close to the chip as possible.
3)
Connect IN, OUT and especially GND respectively to a large copper area to cool the chip to
improve thermal performance and long-term reliability.
GND
IN
OUT
C3
C2
R1
C1
OUT
1
8
IN
OUT
2
7
IN
FB
3
6
NC
GND
4
5
EN
R3
R2
GND
Top Layer
Figure 5—PCB Layout
MP8902 Rev. 1.0
9/4/2017
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2017 MPS. All Rights Reserved.
8
MP8902 – LOW DROPOUT, 250mA LINEAR REGULATOR
PACKAGE INFORMATION
2x2 QFN8
NOTICE: The information in this document is subject to change without notice. Please contact MPS for current specifications.
Users should warrant and guarantee that third party Intellectual Property rights are not infringed upon when integrating MPS
products into any application. MPS will not assume any legal responsibility for any said applications.
MP8902 Rev. 1.0
9/4/2017
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2017 MPS. All Rights Reserved.
9
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