MP8903
Low Dropout
150mA Linear Regulator
The Future of Analog IC Technology
DESCRIPTION
FEATURES
The MP8903 is a 150mA low-dropout linear
regulator that can operate from 2.7V to 6.5V
input. It regulates the output with 2% accuracy
and comes with preset 2.5V, 2.85V or 3.3V
output. An external resistor divider may be used
to adjust the output voltage from 1.25V to 5V.
•
•
The MP8903 has thermal protection to guard
against harsh operating conditions, and is
available in small QFN8 (2x2mm) and 5-pin
TSOT23 packages.
•
•
•
•
•
•
2.7V to 6.5V Input Voltage Range
Fixed Output Voltage Options of 2.5V,
2.85V or 3.3V
Adjustable Output Voltage from 1.25V to 5V
using an External Resistor Divider
Low 100mV Dropout at 100mA Output
2% Accurate Output Voltage
Stable With Low-ESR Output Capacitors
Thermal Protection
Available in Tiny QFN8 (2x2mm) and
TSOT23-5 Packages
APPLICATIONS
•
•
•
802.11 PC Cards
Mobile Handset PLL Power
Audio Codec Power
All MPS parts are lead-free and adhere to the RoHS directive. For MPS green
status, please visit MPS website under Products, Quality Assurance page.
“MPS” and “The Future of Analog IC Technology” are registered trademarks of
Monolithic Power Systems, Inc.
TYPICAL APPLICATION
VIN
160
IN
MP8903DX-X.X
VIN
EN
OUTPUT
OUT
GND
EN (Pin3)
may be connected
to IN (Pin 1) directly
140
1.25V to 5V
R1
FB
The sum of
R1 and R2
R2 should not
exceed 100k
VDROPOUT (mV)
2.7V to 6.5V
VDROPOUT vs ILOAD
120
100
80
60
40
20
0
MP8903 Rev. 1.11
4/30/2015
0
20 40 60 80 100 120 140 160
ILOAD (mA)
www.MonolithicPower.com
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© 2015 MPS. All Rights Reserved.
1
MP8903 – LOW DROPOUT, 150mA LINEAR REGULATOR
ORDERING INFORMATION
Part Number
MP8903DG–2.5*
MP8903DG–2.85
MP8903DG–3.3
MP8903DJ–2.5
MP8903DJ–2.85
MP8903DJ–3.3
Package
QFN8 (2x2mm)
TSOT23-5
Top Marking
Free Air Temperature (TA)
R4
R5
R6
R4
R5
R6
–40°C to +85°C
* For Tape & Reel, add suffix –Z (e.g. MP8903DG–2.85–Z);
For RoHS Compliant Packaging, add suffix –LF (e.g. MP8903DG–2.85–LF–Z)
PACKAGE REFERENCE
TOP VIEW
TOP VIEW
1
8
FB
EN
2
7
NC
IN
3
6
OUT
IN
4
5
OUT
QFN8 (2x2mm)
IN Supply Voltage .......................–0.3V to +7.0V
FB Voltage .........................–0.3V to VOUT + 0.3V
All Other Pins .................................–0.3V to +6V
Continuous Power Dissipation (TA = +25°C) (2)
TSOT23-5 ................................................ 0.57W
QFN8 (2x2mm) .......................................... 1.6W
Junction Temperature ...............................150°C
Lead Temperature ....................................260°C
Storage Temperature ............. –65°C to +150°C
(3)
Input Voltage...................................2.7V to 6.5V
Output Voltage .................................1.25V to 5V
Load Current ...........................150mA Maximum
Operating Temperature............. –40°C to +85°C
Maximum Junction Temp. (TJ) ...............+125°C
MP8903 Rev. 1.11
4/30/2015
1
GND
2
EN
3
5
OUT
4
FB
TSOT23-5
ABSOLUTE MAXIMUM RATINGS (1)
Recommended Operating Conditions
IN
MARKING
GND
Thermal Resistance
(4)
θJA
θJC
TSOT23-5.............................. 220 .... 110.. °C/W
QFN8 (2x2mm) ....................... 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 JESD51-7 4-layer board.
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© 2015 MPS. All Rights Reserved.
2
MP8903 – LOW DROPOUT, 150mA LINEAR REGULATOR
ELECTRICAL CHARACTERISTICS
VIN = 5V, TA = +25°C, unless otherwise noted.
Parameter
Operating Voltage
Output Voltage Accuracy
Shutdown Current
Symbol Condition
IOUT = 1mA
IOUT = 1mA, VOUT = 1.5V to 5V
VEN = 0V, VIN = 5V
FB Regulation Voltage
–40°C ≤ TA ≤ +85°C
VOUT = 3V
IOUT = 150mA
VOUT = 4V
IOUT = 1mA,
VIN = (VOUT + 0.5V) to 6.5V (7)
IOUT = 1mA to 150mA,
VIN = VOUT + 0.5V (7)
VIN > VOUT +0.5V, C3 = 2.2μF,
VIN(AC) = 100mV, f = 1kHz (5)
VIN > VOUT +0.5V, C3 = 2.2μF,
VIN(AC) = 100mV, f = 1MHz (5)
Dropout Voltage (6)
Line Regulation
Load Regulation
PSRR
EN Input High Voltage
EN Input Low Voltage
EN Input Bias Current
Thermal Protection
Typ
1.197
±1.0
0.1
1.222
Max
6.5
±2.0
1
1.246
1.194
1.222
1.249
150
125
VEN = 0V
(5)
Units
V
%
μA
V
mV
0.005
0.08
%/V
0.001
0.02
%/mA
50
dB
20
dB
1.5
(5)
Thermal Protection Hysteresis
Min
2.7
0.01
0.4
1
V
V
μA
155
°C
30
°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
MP8903 Rev. 1.11
4/30/2015
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2015 MPS. All Rights Reserved.
3
MP8903 – LOW DROPOUT, 150mA 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.
IGND vs VIN
IGND vs ILOAD
135
135
130
130
ILOAD = 150mA
125
120
ILOAD = 1mA
115
115
110
110
2.87
2
3
4
5
VIN (V)
6
105
7
50
100
ILOAD (mA)
150
140
VDROPOUT (mV)
VOUT (V)
0
160
2.86
ILOAD = 1mA
2.855
ILOAD = 150mA
2.85
2.845
MP8903 Rev. 1.11
4/30/2015
VIN = 2.7V
VDROPOUT vs ILOAD
VOUT vs. VIN
2.865
2.84
VIN = 5.0V
125
120
105
VIN = 6.5V
120
100
80
60
40
20
3
4
5
VIN (V)
6
7
0
0
20 40 60 80 100 120 140 160
ILOAD (mA)
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MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2015 MPS. All Rights Reserved.
4
MP8903 – LOW DROPOUT, 150mA LINEAR REGULATOR
PIN FUNCTIONS
QFN8
(2x2mm)
Pin #
1
TSOT23-5
Pin #
Name Description
2
GND
2
3
EN
3, 4
1
IN
5, 6
5
OUT
7
NC
8
4
FB
Ground.
Enable Input. Drive EN high to turn on the MP8903; low to turn it off. For
automatic startup, connect EN to IN.
Power Source Input. IN supplies the internal power to the MP8903 and is the
source of the pass transistor. Bypass IN to GND with a 1μF or greater
capacitor.
Regulator Output. OUT is the output of the linear regulator. Bypass OUT to
GND with a 1μF or greater capacitor.
No Connect.
Feedback Input. Connect a resistive voltage divider from OUT to FB to set the
output voltage. The OUT feedback threshold is 1.222V.
OPERATION
The MP8903 is a low-current, low-dropout
linear regulator. The MP8903 uses a PMOS
pass element and features internal thermal
shutdown. The normally fixed output MP8903
may be converted to an adjustable output device
by applying a resistor divider network as shown in
Figure 2. An optional feed-forward capacitor, CBYP,
may be added for an improved transient response.
OUT
VIN
VOUT
INTERNAL
RESISTOR
DIVIDER
+
--
CBYP
FB
BANDGAP
REFERENCE
C3
VEN
GND
Figure 1—Fixed Output Regulator
EXTERNAL
RESISTOR
OUT DIVIDER
VIN
VOUT
FB
+
--
R1
CBYP
BANDGAP
REFERENCE
R2
COUT
VEN
GND
Figure 2—Adjustable Regulator: VOUT = VFB (1+(R1/R2))
MP8903 Rev. 1.11
4/30/2015
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2015 MPS. All Rights Reserved.
5
MP8903 – LOW DROPOUT, 150mA LINEAR REGULATOR
APPLICATION INFORMATION
Setting the Output Voltage
The fixed output voltage of the MP8903 is set to
2.5V, 2.85V 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 in
order to minimize the impact of the internal
resistor divider. For an accurate output-voltage
setting, use 10kΩ (±1%) for the low-side
resistor R2 of the voltage divider, while 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
R1 =
2.5 V − 1.222 V
= 10.41kΩ
⎛ 1.222 V ⎞
⎜
⎟
⎝ 10kΩ ⎠
Input Capacitor Selection
For proper operation, place a ceramic capacitor
(C1) between 1µF and 10µF of dielectric type
X5R or X7R between the input pin and ground.
Larger values in this range will help improve
line transient response at the drawback of
increased size.
Output Capacitor Selection
For stable operation, use a ceramic capacitor
(C3) of type X5R or X7R between 1µF and
10µF. Larger values in this range will help
improve load transient response and reduce
noise with the drawback of increased size.
Output capacitors of other dielectric types may
be used, but are not recommended as their
capacitance can deviate greatly from their rated
value over temperature.
To improve load transient response, add a
small ceramic (X5R, X7R or Y5V dielectric)
100nF feed forward capacitor in parallel with R1.
The feed forward capacitor is not required for
stable operation.
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
R2 (Ω)
10k
In Figures 3 and 4, C2 is added for an improved
transient response.
MP8903 Rev. 1.11
4/30/2015
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2015 MPS. All Rights Reserved.
6
MP8903 – LOW DROPOUT, 150mA LINEAR REGULATOR
TYPICAL APPLICATION CIRCUIT
VIN
2.7V to 6.5V
3, 4
IN
OUT
5, 6
2.85V
C2
100nF
MP8903DX-2.85
2
VIN
GND
EN
OUTPUT
FB
8
1
Figure 3—Typical Application Circuit (Fixed)
VIN
2.7V to 6.5V
3, 4
IN
OUT
5, 6
OUTPUT
2V
MP8903DX-X.X
VIN
2
EN
GND
FB
8
1
Figure 4—Typical Application Circuit (Adjustable)
MP8903 Rev. 1.11
4/30/2015
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2015 MPS. All Rights Reserved.
7
MP8903 – LOW DROPOUT, 150mA 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.
VIN
3,4
IN
C1
5,6
2
GND
EN
FB
VIN
OUTPUT
MP8903DG
R3
VIN
OUT
C2
R1
8
1
VIN
C1
3
EN
R2
GND
1
8
FB
EN
2
7
NC
IN
3
6
OUT
IN
4
5
OUT
C1
OUTPUT
GND
FB
C2
R1
4
C3
R2
VOUT
VIN
R3
R1
C2
1 VIN OUT 5
C1
IN
5
2
R2
GND
OUT
MP8903DJ
R3
C3
4
R3
IN
3 EN
C3
C3
2 GND
FB 4
R2
C2
OUT
R1
GND
Top Layer
Figure 5—PCB Layout
MP8903 Rev. 1.11
4/30/2015
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2015 MPS. All Rights Reserved.
8
MP8903 – LOW DROPOUT, 150mA LINEAR REGULATOR
PACKAGE INFORMATION
QFN8 (2x2mm)
PIN 1 ID
MARKING
1.90
2.10
0.25
0.45
0.18
0.30
1.90
2.10
PIN 1 ID
INDEX AREA
PIN 1 ID
SEE DETAIL A
0.45
0.65
8
1
1.05
1.25
0.50
BSC
5
TOP VIEW
4
BOTTOM VIEW
0.80
1.00
PIN 1 ID OPTION A
R0.20 TYP.
PIN 1 ID OPTION B
R0.20 TYP.
0.20 REF
0.00
0.05
SIDE VIEW
DETAIL A
NOTE:
1.90
0.70
0.60
1) ALL DIMENSIONS ARE IN MILLIMETERS.
2) EXPOSED PADDLE SIZE DOES NOT INCLUDE MOLD FLASH.
3) LEAD COPLANARITY SHALL BE 0.10 MILLIMETER MAX.
4) DRAWING CONFORMS TO JEDEC MO-229, VARIATION VCCD-3.
5) DRAWING IS NOT TO SCALE.
0.25
1.20
0.50
RECOMMENDED LAND PATTERN
MP8903 Rev. 1.11
4/30/2015
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2015 MPS. All Rights Reserved.
9
MP8903 – LOW DROPOUT, 150mA LINEAR REGULATOR
TSOT23-5
0.95
BSC
0.60
TYP
2.80
3.00
5
4
1.20
TYP
1.50
1.70
1
2.60
TYP
2.60
3.00
3
TOP VIEW
RECOMMENDED LAND PATTERN
0.84
0.90
1.00 MAX
0.09
0.20
SEATING PLANE
0.30
0.50
0.95 BSC
0.00
0.10
SEE DETAIL "A"
FRONT VIEW
SIDE VIEW
NOTE:
GAUGE PLANE
0.25 BSC
0o-8o
DETAIL A
0.30
0.50
1) ALL DIMENSIONS ARE IN MILLIMETERS.
2) PACKAGE LENGTH DOES NOT INCLUDE MOLD FLASH,
PROTRUSION OR GATE BURR.
3) PACKAGE WIDTH DOES NOT INCLUDE INTERLEAD FLASH
OR PROTRUSION.
4) LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING)
SHALL BE 0.10 MILLIMETERS MAX.
5) DRAWING CONFORMS TO JEDEC MO-193, VARIATION AA.
6) DRAWING IS NOT TO SCALE.
NOTICE: The information in this document is subject to change without notice. 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.
MP8903 Rev. 1.11
4/30/2015
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2015 MPS. All Rights Reserved.
10
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