MPM3805AGQB-AEC1 [MPS]
6V Input, 0.6A Module, Synchronous, Step-Down Converter with Integrated Inductor AEC-Q100 Qualified;
| 型号： | MPM3805AGQB-AEC1 |
| 厂家： | 
MONOLITHIC POWER SYSTEMS |
| 描述： | 6V Input, 0.6A Module, Synchronous, Step-Down Converter with Integrated Inductor AEC-Q100 Qualified |
| 文件： | 总20页 (文件大小：1086K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MPM3805A
6V Input, 0.6A Module,
Synchronous, Step-Down Converter
with Integrated Inductor
AEC-Q100 Qualified
DESCRIPTION
FEATURES
The MPM3805A is an automotive grade, step-
down module converter with built-in power
MOSFETs and an inductor. The module’s
integrated inductor simplifies the power system
design and provides easy and efficient use. The
DC/DC module comes in a small surface-
Guaranteed Industrial/Automotive Temp
Wide 2.6V to 6V Operating Input Range
Adjustable Output from 0.6V
Up to 0.6A Peak Output Current
100% Duty Cycle in Dropout
Forced CCM Mode
EN and Power Good for Power Sequencing
Cycle-by-Cycle Over-Current Protection
(OCP)
Short-Circuit Protection (SCP) with Hiccup
Mode
Only Four External Components Required:
Two Ceramic Capacitors, Two FB Divider
Resistors
mounted
QFN-12 (2.5mmx3.0mmx0.9mm)
package and achieves 0.6A of peak output
current from a 2.6V to 6V input voltage range
with excellent load and line regulation. The
output voltage can be regulated as low as 0.6V.
Only FB resistors and input and output
capacitors are needed to complete the design.
The constant-on-time control (COT) scheme
provides fast transient response and eases loop
stabilization. Fault condition protection includes
cycle-by-cycle current limiting and thermal
shutdown.
Available in a QFN-12 (2.5mm x 3.0mm x
0.9mm) Package
Total Solution Size 6mmx3.8mm
Available in AEC-Q100
The MPM3805A is ideal for a wide range of
automotive applications, including small ECUs,
camera modules, telematics, and infotainment
systems.
APPLICATIONS
Automotive ECU
Rear Cameras
E-Call
Telematics
Infotainment Systems
All MPS parts are lead-free, halogen-free, and adhere to the RoHS directive.
For MPS green status, please visit the MPS website under Quality
Assurance. “MPS” and “The Future of Analog IC Technology” are registered
trademarks of Monolithic Power Systems, Inc.
TYPICAL APPLICATION
Efficiency vs. Load
VOUT = 1.2V
100
90
80
70
60
VIN=2.5V
50
40
30
20
VIN=3.3V
VIN=4V
VIN=5V
VIN=6V
0.0
0.1
0.2
0.3
0.4
0.5
0.6
LOAD CURRENT ( A )
MPM3805A Rev. 1.0
7/9/2018
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2018 MPS. All Rights Reserved.
1
MPM3805A – 6V, 1.2A PEAK SIMPLE MODULE WITH INTEGRATED INDUCTOR, AEC-Q100 QUALIFIED
ORDERING INFORMATION
Part Number*
Package
Top Marking
MPM3805AGQB-AEC1
MPM3805AGQBE-AEC1**
QFN-12 (2.5mmx3.0mmx0.9mm)
See Below
* For Tape & Reel, add suffix –Z (e.g.: MPM3805AGQB-AEC1–Z).
**Under qualification, Wettable Flank
TOP MARKING
TOP MARKING
(MPM3805AGQB-AEC1)
(MPM3805AGQBE-AEC1)
BHP: Product code of MPM3805AGQBE-AEC1
Y: Year code
WW: Week code
BDZ: Product code of MPM3805AGQB-AEC1
Y: Year code
WW: Week code
LLL: Lot number
LLL: Lot number
PACKAGE REFERENCE
TOP VIEW
EN
9
OUT_S AGND
FB
10
12
11
1
2
8
7
PG
PGND
PGND
VIN
NC
NC
OUT
OUT
6
5
3
4
QFN-12 (2.5mmx3.0mmx0.9mm)
MPM3805A Rev. 1.0
7/9/2018
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2018 MPS. All Rights Reserved.
2
MPM3805A – 6V, 1.2A PEAK SIMPLE MODULE WITH INTEGRATED INDUCTOR, AEC-Q100 QUALIFIED
ABSOLUTE MAXIMUM RATINGS (1)
Supply voltage (VIN) .................................... 6.5V
VSW....................................-0.3V (-5V for <10ns)
to 6.5V (7V for <10ns)
Thermal Resistance (3) θJA
QFN-12 (2.5mmx3.0mm)....... 65....... 13... °C/W
θJC
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-to-
ambient 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 produces an excessive die temperature, causing
the device to go into thermal shutdown. Internal thermal
shutdown circuitry protects the device from permanent
damage.
All other pins..................................-0.3V to 6.5V
Junction temperature................................150°C
Lead temperature .....................................260°C
(2)
Continuous power dissipation (TA = +25°C)
……….….. ................................................. 1.9W
Storage temperature................ -65°C to +150°C
Recommended Operating Conditions
Supply voltage (VIN) ...........................2.6V to 6V
Output voltage (VOUT)................ 12% x VIN to VIN
Operating junction temp. (TJ)... -40°C to +125°C
3) Measured on JESD51-7, 4-layer PCB.
MPM3805A Rev. 1.0
7/9/2018
www.MonolithicPower.com
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© 2018 MPS. All Rights Reserved.
3
MPM3805A – 6V, 1.2A PEAK SIMPLE MODULE WITH INTEGRATED INDUCTOR, AEC-Q100 QUALIFIED
ELECTRICAL CHARACTERISTICS
VIN = 5V, TJ = -40°C to +125°C, unless otherwise noted. Typical values are at TJ = +25°C.
Parameter
Symbol
Condition
Min
Typ
Max
Units
2.6V ≤ VIN ≤ 6V, TJ = +25°C
588
600
612
Feedback voltage
VFB
mV
2.6V ≤ VIN ≤ 6V, TJ = -40°C to
+125°C
573
627
Feedback current
IFB
RDSON_P
RDSON_N
L
VFB = 0.63V
10
120
70
1000
180
nA
mΩ
mΩ
μH
P-FET switch on resistance
N-FET switch on resistance
Inductor L value
140
Inductance value at 1MHz
100% on duty
0.47
130
250
Inductor DC resistance
Dropout resistance
RDCR
RDR
mΩ
mΩ
VEN = 0V, VIN = 6V, VSW = 0V
and 6V, TJ = +25°C
Switch leakage
0
1
μA
TJ = +25°C
1.2
1.0
P-FET current limit
A
TJ = -40°C to +125°C
VIN = 5V, VOUT = 1.2V
VIN = 3.6V, VOUT = 1.2V
VIN = 3.6V, VOUT = 1.2V
70
100
3500
60
On time
TON
ns
Switching frequency
Minimum off time
Soft-start time
Fs
2800
4200
kHz
ns
TMIN-OFF
TSS-ON
1.5
ms
Power good upper trip
threshold
FB voltage in respect to the
regulation
PGH
+10
%
Power good lower trip
threshold
PGL
PGD
VPG-L
-10
50
%
μs
V
Power good delay
Power good sink current
capability
Sink 1mA
0.4
Power good logic high
voltage
VPG-H
RPG
VIN = 5V, VFB = 0.6V
4.7
2.2
V
kΩ
V
Power good internal pull-up
resistor
550
2.4
Under-voltage lockout
threshold rising
2.58
0.4
1
Under-voltage lockout
threshold hysteresis
300
mV
EN input logic low voltage
EN input logic high voltage
V
V
1.2
VEN = 2V
VEN = 0V
1.5
0.1
EN input current
μA
MPM3805A Rev. 1.0
7/9/2018
www.MonolithicPower.com
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© 2018 MPS. All Rights Reserved.
4
MPM3805A – 6V, 1.2A PEAK SIMPLE MODULE WITH INTEGRATED INDUCTOR, AEC-Q100 QUALIFIED
ELECTRICAL CHARACTERISTICS (continued)
VIN = 5V, TJ = -40°C to +125°C, unless otherwise noted. Typical values are at TJ = +25°C.
Parameter
Symbol
Condition
Min
Typ
Max
1
Units
VEN = 0V, TJ = +25°C
VEN = 0V, TJ = -40°C to +125°C
Supply current (shutdown)
μA
10
VEN = 2V, VFB = 0.63V, VIN = 5V,
TJ = +25°C
485
560
580
Supply current (quiescent)
Thermal shutdown (4)
μA
VEN = 2V, VFB = 0.63V, VIN = 5V,
TJ = -40°C to +125°C
150
30
C
C
Thermal hysteresis (4)
NOTE:
4) Not tested in production, guaranteed by design.
MPM3805A Rev. 1.0
7/9/2018
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2018 MPS. All Rights Reserved.
5
MPM3805A – 6V, 1.2A PEAK SIMPLE MODULE WITH INTEGRATED INDUCTOR, AEC-Q100 QUALIFIED
TYPICAL PERFORMANCE CHARACTERISTICS
VIN = 5V, VOUT = 1.2V, CIN = 10µF, COUT = 20µF, TA = +25°C, unless otherwise noted.
Shutdown Current vs. VIN
Maximum IOUT vs. Ambient
Temperature
1.8
1.6
1.4
1.2
1
0.5
0.4
0.3
0.2
0.1
0.0
0.8
0.6
0.4
0.2
0
Vout=1.2V
Vout=1.8V
3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5
-60 -40 -20
0
20 40 60 80 100
INPUT VOLTAGE ( V )
AMBIENT TEMPERATURE ( ˚C )
Output Current Derating vs. Output
Voltage
Efficiency vs. Load
VOUT = 1.2V
2
1.8
1.6
1.4
1.2
1
100
90
80
70
60
50
40
30
20
VIN=2.5V
VIN=3.3V
VIN=4V
VIN=5V
VIN=6V
0.8
0.6
0.4
0.2
0
VIN=3.3V
VIN=5V
VIN=6V
0.0
0.1
0.2
0.3
0.4
0.5
0.6
1
1.5
2
2.5
3
3.5
LOAD CURRENT ( A )
OUTPUT VOLTAGE (V)
Efficiency vs. Line
VOUT = 1.2V
Load Regulation
VOUT = 1.2V
100
90
80
70
60
50
1.5
1.2
VIN=2.5V
VIN=3.3V
VIN=4V
VIN=5V
VIN=6V
0.9
0.6
0.3
0.0
-0.3
-0.6
-0.9
-1.2
-1.5
2.5
3.2
3.9
4.6
5.3
6.0
0.0
0.1
0.2
0.3
0.4
0.5
0.6
INPUT VOLTAG ( V )
LOAD CURRENT ( A )
MPM3805A Rev. 1.0
7/9/2018
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2018 MPS. All Rights Reserved.
6
MPM3805A – 6V, 1.2A PEAK SIMPLE MODULE WITH INTEGRATED INDUCTOR, AEC-Q100 QUALIFIED
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 5V, CIN = 10µF, COUT = 20µF, TA = +25°C, unless otherwise noted.
Line Regulation
VOUT = 1.2V
Efficiency vs. Load
VOUT = 1.8V
100
90
80
70
60
50
40
30
20
0.5
0.4
0.3
0.2
0.1
VIN=2.5V
VIN=3.3V
VIN=4V
VIN=5V
VIN=6V
0.0
-0.1
-0.2
-0.3
-0.4
-0.5
0.0
0.1
0.2
0.3
0.4
0.5
0.6
2.5
3.2
3.9
4.6
5.3
6.0
6.0
6.0
INPUT VOLTAG ( V )
LOAD CURRENT ( A )
Efficiency vs. Line
VOUT = 1.8V
Load Regulation
VOUT = 1.8V
1.0
0.8
100
90
80
70
60
50
VIN=2.5V
VIN=3.3V
VIN=4V
VIN=5V
VIN=6V
0.6
0.4
0.2
0.0
-0.2
-0.4
-0.6
-0.8
-1.0
2.5
3.2
3.9
4.6
5.3
0.0
0.1
0.2
0.3
0.4
0.5
0.6
INPUT VOLTAG ( V )
LOAD CURRENT ( A )
Line Regulation
VOUT = 1.8V
0.5
0.4
0.3
0.2
0.1
0.0
-0.1
-0.2
-0.3
-0.4
-0.5
2.5
3.2
3.9
4.6
5.3
INPUT VOLTAG ( V )
MPM3805A Rev. 1.0
7/9/2018
www.MonolithicPower.com
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© 2018 MPS. All Rights Reserved.
7
MPM3805A – 6V, 1.2A PEAK SIMPLE MODULE WITH INTEGRATED INDUCTOR, AEC-Q100 QUALIFIED
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 5V, VOUT = 1.2V, CIN = 10µF, COUT = 20µF, TA = +25°C, unless otherwise noted.
PFET Current Limit vs. TA
Switch Frequency vs. TA
2.3
2.2
2.1
2.0
1.9
1.8
4.0
3.8
3.6
3.4
3.2
3.0
VIN=5V
VIN=3.6V
-40
-10
20
50
80
110
140
-40
-10
20
50
80
110
140
140
140
AMBIENT TEMPERATURE ( ˚C )
AMBIENT TEMPERATURE ( ˚C )
Enable On/Off vs. TA
Feedback Voltage vs. TA
0.9
0.8
0.7
0.6
0.5
0.4
0.3
650
630
610
590
570
550
VIN=2.5V
VIN=5V
Enable_ON
Enable_OFF
-40
-10
20
50
80
110
-40
-10
20
50
80
110
140
AMBIENT TEMPERATURE ( ˚C )
AMBIENT TEMPERATURE( ˚C )
Supply Current vs. TA
600
550
500
450
400
350
300
VIN=5V
VIN=2.5V
-40
-10
20
50
80
110
AMBIENT TEMPERATURE ( ˚C )
MPM3805A Rev. 1.0
7/9/2018
www.MonolithicPower.com
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© 2018 MPS. All Rights Reserved.
8
MPM3805A – 6V, 1.2A PEAK SIMPLE MODULE WITH INTEGRATED INDUCTOR, AEC-Q100 QUALIFIED
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 5V, CIN = 10µF, COUT = 20µF, TA = +25°C, unless otherwise noted.
Steady State
VIN = 5V, VOUT = 1.2V, IOUT = 0.1A
Steady State
VIN = 5V, VOUT = 1.2V, IOUT = 0.3A
CH1: VIN
5V/div.
CH1: VIN
5V/div.
CH3: VOUT
1V/div.
CH3: VOUT
1V/div.
CH4: IOUT
1A/div.
CH4: IOUT
0.5A/div.
100µs/div.
100µs/div.
Steady State
VIN = 5V, VOUT = 1.2V, IOUT = 0.6A
Steady State
VIN = 5V, VOUT = 1.8V, IOUT = 0.1A
CH1: VIN
5V/div.
CH1: VIN
5V/div.
CH3: VOUT
1V/div.
CH3: VOUT
1V/div.
CH4: IOUT
0.5A/div.
CH4: IOUT
1A/div.
400µs/div.
2ms/div.
Steady State
VIN = 5V, VOUT = 1.8V, IOUT = 0.6A
Steady State
VIN = 5V, VOUT = 1.8V, IOUT = 0.6A
CH1: VIN
5V/div.
CH1: VIN
5V/div.
CH3: VOUT
1V/div.
CH3: VOUT
1V/div.
CH4: IOUT
1A/div.
CH4: IOUT
0.5A/div.
2ms/div.
2ms/div.
MPM3805A Rev. 1.0
7/9/2018
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2018 MPS. All Rights Reserved.
9
MPM3805A – 6V, 1.2A PEAK SIMPLE MODULE WITH INTEGRATED INDUCTOR, AEC-Q100 QUALIFIED
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 5V, CIN = 10µF, COUT = 20µF, TA = +25°C, unless otherwise noted.
Power Up
VIN = 2.5V, VOUT = 1.2V, IOUT = 0.6A
Power Down
VIN = 2.5V, VOUT = 1.2V, IOUT = 0.6A
CH1: VIN
2V/div.
CH1: VIN
2V/div.
CH3: VOUT
1V/div.
CH3: VOUT
1V/div.
CH4: IOUT
500mA/div.
CH4: IOUT
500mA/div.
4ms/div.
4ms/div.
Power Up
VIN = 3.3V, VOUT = 1.8V, IOUT = 0.6A
Power Down
VIN = 3.3V, VOUT = 1.8V, IOUT = 0.6A
CH1: VIN
2V/div.
CH1: VIN
2V/div.
CH3: VOUT
1V/div.
CH3: VOUT
1V/div.
CH4: IOUT
500mA/div.
CH4: IOUT
500mA/div.
10ms/div.
10ms/div.
Enable On
VIN = 2.5V, VOUT = 1.2V, IOUT = 0.6A
Enable Off
VIN = 2.5V, VOUT = 1.2V, IOUT = 0.6A
CH1: VIN
2V/div.
CH1: VIN
2V/div.
CH2:VEN
2V/div.
CH2:VEN
2V/div.
CH3: VOUT
1V/div.
CH3: VOUT
1V/div.
CH4: IOUT
1A/div.
CH4: IOUT
1A/div.
1ms/div.
100µs/div.
MPM3805A Rev. 1.0
7/9/2018
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2018 MPS. All Rights Reserved.
10
MPM3805A – 6V, 1.2A PEAK SIMPLE MODULE WITH INTEGRATED INDUCTOR, AEC-Q100 QUALIFIED
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 5V, CIN = 10µF, COUT = 20µF, TA = +25°C, unless otherwise noted.
Enable On
VIN = 3.3V, VOUT = 1.8V, IOUT = 0.6A
Enable Off
VIN = 3.3V, VOUT = 1.8V, IOUT = 0.6A
CH1: VIN
2V/div.
CH1: VIN
2V/div.
CH2:VEN
5V/div.
CH2:VEN
5V/div.
CH3: VOUT
2V/div.
CH3: VOUT
2V/div.
CH4: IOUT
CH4: IOUT
500mA/div.
500mA/div.
1ms/div.
200µs/div.
Steady State
VIN = 5V, VOUT = 1.8V, IOUT = 0.6A
Steady State
VIN = 5V, VOUT = 1.2V, IOUT = 0.6A
CH1: VIN
5V/div.
CH1: VIN
5V/div.
CH3: VOUT
1V/div.
CH3: VOUT
1V/div.
CH4: IOUT
1A/div.
CH4: IOUT
1A/div.
2ms/div.
100µs/div.
Short Circuit
VIN = 5V, VOUT = 1.2V
Short-Circuit Recovery
VIN = 5V, VOUT = 1.2V
CH1: VIN
5V/div.
CH1: VIN
5V/div.
CH3: VOUT
1V/div.
CH3: VOUT
1V/div.
CH4: IIN
1A/div.
CH4: IIN
1A/div.
2ms/div.
2ms/div.
MPM3805A Rev. 1.0
7/9/2018
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2018 MPS. All Rights Reserved.
11
MPM3805A – 6V, 1.2A PEAK SIMPLE MODULE WITH INTEGRATED INDUCTOR, AEC-Q100 QUALIFIED
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 5V, CIN = 10µF, COUT = 20µF, TA = +25°C, unless otherwise noted.
Short-Circuit Entry
VIN = 5V, VOUT = 1.8V
Short Circuit
VIN = 5V, VOUT = 1.8V
CH1: VIN
5V/div.
CH1: VIN
5V/div.
CH3: VOUT
1V/div.
CH3: VOUT
1V/div.
CH4: IIN
2A/div.
CH4: IIN
2A/div.
2ms/div.
2ms/div.
Short-Circuit Recovery
VIN = 5V, VOUT = 1.2V
Transient Response
VIN = 2.5V, VOUT = 1.2V, IOUT = 0 - 0.6A,
0.25A/μs
CH1: VIN
5V/div.
CH1: VIN
2V/div.
CH3:
VOUT/AC
CH3: VOUT
1V/div.
20mV/div.
CH4: IIN
2A/div.
CH4: IOUT
500mA/div.
2ms/div.
200µs/div.
Transient Response
VIN = 3.3V, VOUT = 1.2V, IOUT = 0 - 0.6A,
0.25A/μs
Transient Response
VIN = 6V, VOUT = 1.2V, IOUT = 0 - 0.6A, 0.25A/μs
CH1: VIN
2V/div.
CH1: VIN
5V/div.
CH3:
VOUT/AC
CH3:
VOUT/AC
20mV/div.
20mV/div.
CH4: IOUT
CH4: IOUT
500mA/div.
500mA/div.
200µs/div.
200µs/div.
MPM3805A Rev. 1.0
7/9/2018
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2018 MPS. All Rights Reserved.
12
MPM3805A – 6V, 1.2A PEAK SIMPLE MODULE WITH INTEGRATED INDUCTOR, AEC-Q100 QUALIFIED
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 5V, CIN = 10µF, COUT = 20µF, TA = +25°C, unless otherwise noted.
Transient Response
VIN = 2.5V, VOUT = 1.8V, IOUT = 0 - 0.6A,
0.25A/μs
Transient Response
VIN = 3.3V, VOUT = 1.8V, IOUT = 0 - 0.6A,
0.25A/μs
CH1: VIN
2V/div.
CH1: VIN
2V/div.
CH3:
VOUT/AC
CH3:
VOUT/AC
20mV/div.
20mV/div.
CH4: IOUT
CH4: IOUT
500mA/div.
500mA/div.
200µs/div.
200µs/div.
Transient Response
VIN = 6V, VOUT = 1.8V, IOUT = 0 - 0.6A, 0.25A/μs
CH1: VIN
5V/div.
CH3:
VOUT/AC
20mV/div.
CH4: IOUT
500mA/div.
200µs/div.
MPM3805A Rev. 1.0
7/9/2018
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13
MPM3805A – 6V, 1.2A PEAK SIMPLE MODULE WITH INTEGRATED INDUCTOR, AEC-Q100 QUALIFIED
PIN FUNCTIONS
Pin #
Name
PGND
NC
Description
1, 2
Power ground.
Internal SW pad.
3, 4
Output voltage power rail. Connect the load to OUT. An output capacitor is required
on OUT.
5, 6
OUT
Supply voltage. The MPM3805A operates from a +2.6V to +6V unregulated input. A
decoupling capacitor is needed to prevent large voltage spikes from appearing at the
input. Place the decoupling capacitor as close to VIN as possible.
7
VIN
Power good indicator. The output of PG is an open drain with an internal pull-up
resistor to VIN. PG is pulled up to VIN when the FB voltage is within 10% of the
regulation level. If the FB voltage is out of that regulation range, PG is low.
8
PG
9
EN
FB
On/off control.
Feedback. An external resistor divider from the output to GND tapped to FB sets the
output voltage.
10
11
12
AGND
Analog ground for the internal control circuit.
OUT_S Output voltage sense.
MPM3805A Rev. 1.0
7/9/2018
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14
MPM3805A – 6V, 1.2A PEAK SIMPLE MODULE WITH INTEGRATED INDUCTOR, AEC-Q100 QUALIFIED
BLOCK DIAGRAM
Figure 1: Functional Block Diagram
MPM3805A Rev. 1.0
7/9/2018
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MPM3805A – 6V, 1.2A PEAK SIMPLE MODULE WITH INTEGRATED INDUCTOR, AEC-Q100 QUALIFIED
Soft Start (SS)
OPERATION
The MPM3805A has a built-in soft start that
ramps up the output voltage at a controlled slew
rate. This prevents an overshoot during start-
up. The soft-start time is about 1.5ms, typically.
The MPM3805A is available in a small, surface-
mounted QFN-12 (2.5mmx3.0mmx0.9mm)
package. The module’s integrated inductor
simplifies the schematic and layout design.
Only FB resistors and input and output
capacitors are required to complete the design.
The MPM3805A uses constant-on-time (COT)
control with input voltage feed-forward to
stabilize the switching frequency over the entire
input range. At light load, the MPM3805A
employs proprietary control of the low-side
switch and inductor current to improve
efficiency.
Power Good Indictor (PG)
The MPM3805A has an open drain pin with a
550kΩ pull-up resistor for power good indication
(PG). When the feedback voltage (VFB) is within
±10% of the regulation voltage (e.g.: 0.6V), PG
is pulled up to VIN by the internal resistor. If VFB
is out of the ±10% window, PG is pulled down
to ground by an internal MOSFET. The
MOSFET has a maximum RDS(ON) of less than
400Ω.
Constant-On-Time Control (COT)
Compared to fixed-frequency pulse-width
modulation (PWM) control, COT control offers
the advantage of a simpler control loop and
faster transient response. By using the input
voltage feed-forward, the MPM3805A maintains
a nearly constant switching frequency across
the input and output voltage ranges. The on
time of the switching pulse can be estimated
with Equation (1):
Current Limit
The MPM3805A has a typical 2.1A current limit
for the high-side switch. When the high-side
switch reaches the current limit, the MPM3805A
triggers the hiccup threshold until the current
decreases. This prevents the inductor current
from continuing to rise and damaging the
components.
Short Circuit and Recovery
VOUT
The MPM3805A enters short-circuit protection
(SCP) when the current limit is reached and
attempts to recover with hiccup mode. In SCP,
the MPM3805A disables the output power
stage, discharges the soft-start capacitor, and
attempts to soft start again automatically. If the
short-circuit condition remains after the soft
start ends, the MPM3805A repeats the cycle
until the short circuit disappears, and the output
rises back to the regulation level.
TON
0.28us
(1)
V
IN
To prevent inductor current run-away during the
load transition, the MPM3805A fixes the
minimum off time to 60ns. This minimum off-
time limit does not affect operation in steady
state.
The MPM3805A works in forced continuous
conduction mode (FCCM).
Enable (EN)
If the input voltage is greater than the under-
voltage lockout (UVLO) threshold (typically
2.3V), the MPM3805A is enabled by pulling EN
above 1.2V. Float EN or pull EN down to
ground to disable the MPM3805A. There is an
internal 1MΩ resistor from EN to ground.
MPM3805A Rev. 1.0
7/9/2018
www.MonolithicPower.com
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© 2018 MPS. All Rights Reserved.
16
MPM3805A – 6V, 1.2A PEAK SIMPLE MODULE WITH INTEGRATED INDUCTOR, AEC-Q100 QUALIFIED
For higher output voltages, a 22µF capacitor
may be needed to enhance system stability.
APPLICATION INFORMATION
Setting the Output Voltage
Since the input capacitor absorbs the input
switching current, it requires an adequate ripple
current rating. The RMS current in the input
capacitor can be estimated with Equation (3):
The external resistor divider is used to set the
output voltage (see the Typical Application
Circuit on page 19). The feedback resistor (R1)
cannot be too large or too small considering the
trade-off for stability and dynamics. Set R1 to
be between 40 - 80kΩ. Then calculate R2 with
Equation (2):
VOUT
VOUT
IC1 ILOAD
1
V
V
IN
IN
(3)
R1
The worst-case condition occurs at VIN = 2VOUT
shown in Equation (4):
,
(2)
R2
Vout
1
0.6
ILOAD
IC1
(4)
The feedback circuit is shown in Figure 2.
2
For simplification, choose an input capacitor
with an RMS current rating greater than half of
the maximum load current.
OUT
MPM3805A
R1
R2
The input capacitor can be electrolytic, tantalum,
or ceramic. When using electrolytic or tantalum
capacitors, place a small, high-quality, ceramic
capacitor (i.e.: 0.1μF) as close to the IC as
possible. When using ceramic capacitors,
ensure that they have enough capacitance to
provide a sufficient charge to prevent an
excessive voltage ripple at the input. The input-
voltage ripple caused by the capacitance can
be estimated with Equation (5):
FB
Figure 2: Feedback Network
Table 1 lists the recommended resistor values
for common output voltages.
Table 1: Resistor Values for Common Output
Voltages
ILOAD VOUT
V
(5)
V
1
OUT
IN
IN
fS C1
VIN
V
VOUT (V)
1.0
R1 (kΩ)
40 (1%)
40 (1%)
60 (1%)
80 (1%)
80 (1%)
R2 (kΩ)
60 (1%)
40 (1%)
30 (1%)
25 (1%)
17.7 (1%)
Selecting the Output Capacitor
1.2
An output capacitor (COUT) is required to
maintain the DC output voltage. Low ESR,
ceramic capacitors are recommended to keep
the output voltage ripple low. The output
voltage ripple is estimated with Equation (6):
1.8
2.5
3.3
Selecting the Input Capacitor
The input current to the step-down converter is
discontinuous and therefore requires
VOUT
VOUT
1
(6)
VOUT
1
RESR
fS L1
V
8fS C2
IN
a
capacitor to supply AC current while
maintaining the DC input voltage. For optimal
performance, use low ESR capacitors. Ceramic
capacitors with X5R or X7R dielectrics are
highly recommended due to their low ESR and
small temperature coefficients. For most
applications, a 10µF capacitor is sufficient.
Where L1 is the inductor value (0.47µH), and
RESR is the equivalent series resistance (ESR)
value of the output capacitor.
MPM3805A Rev. 1.0
7/9/2018
www.MonolithicPower.com
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© 2018 MPS. All Rights Reserved.
17
MPM3805A – 6V, 1.2A PEAK SIMPLE MODULE WITH INTEGRATED INDUCTOR, AEC-Q100 QUALIFIED
When using ceramic capacitors, the impedance
at the switching frequency is dominated by the
capacitance. The output voltage ripple is
caused mainly by the capacitance. For
simplification, the output voltage ripple can be
estimated with Equation (7):
GND
VIN
VOUT
V
OUT
IN
(7)
ΔVOUT
1
2
8fS L1 C2
V
PGND
PGND
PG
When using tantalum or electrolytic capacitors,
the ESR dominates the impedance at the
switching frequency. For simplification, the
output ripple can be approximated with
Equation (8):
VIN
OUT
N/C
OUT
N/C
VOUT
VOUT
(8)
ΔVOUT
1
RESR
fS L1
V
IN
GND
OUT
The characteristics of the output capacitor
affect the stability of the regulation system.
PCB Layout Guidelines
Top View
Efficient PCB layout is critical for stable
operation. The module’s integrated inductor
simplifies the schematic and layout design.
Only FB resistors and input and output
capacitors are needed to complete the design.
For best results, refer to Figure 3 and follow the
guidelines below.
VIN
GND
EN
PG
OUT
1. Place the high-current paths (PGND, VIN,
and OUT) very close to the device with
short, direct, and wide traces.
FB
GND
VIN
2. Place the input capacitor as close to VIN
and PGND as possible.
3. Place the external feedback resistors next
to FB.
4. Keep the switching node away from the
feedback network.
GND
OUT
For additional device applications, please refer
to the related evaluation board datasheets
(EVB).
Bottom View
Figure 3: Recommended Layout
MPM3805A Rev. 1.0
7/9/2018
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18
MPM3805A – 6V, 1.2A PEAK SIMPLE MODULE WITH INTEGRATED INDUCTOR, AEC-Q100 QUALIFIED
TYPICAL APPLICATION CIRCUIT
Figure 4: Typical Application Circuits
MPM3805A Rev. 1.0
7/9/2018
www.MonolithicPower.com
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© 2018 MPS. All Rights Reserved.
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MPM3805A – 6V, 1.2A PEAK SIMPLE MODULE WITH INTEGRATED INDUCTOR, AEC-Q100 QUALIFIED
PACKAGE INFORMATION
QFN-12 (2.5mmx3.0mmx0.9mm)
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.
MPM3805A Rev. 1.0
7/9/2018
www.MonolithicPower.com
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20
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