MP28301GG-Z [MPS]
Switching Regulator,;
| 型号： | MP28301GG-Z |
| 厂家： | 
MONOLITHIC POWER SYSTEMS |
| 描述： | Switching Regulator, 开关 |
| 文件： | 总22页 (文件大小：1103K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MP28301
Ultra-Low 500nA IQ, Wide Input 2-5.5V,
700mA Step-Down Regulator Plus 300nAIQ,
2-5.5V Input, 100mA LDO in a 2x2mm QFN
DESCRIPTION
FEATURES
The MP28301 is
a
monolithic power-
700mA Buck Switcher
o Ultra-Low IQ: 500nA
o Wide 2.0V to 5.5V Operating Input
Range
management unit containing a 700mA, high-
efficiency, step-down, switching converter and a
100mA LDO regulator. The nA quiescent current
provides extremely high efficiency when the load
current is in the µA range. With the minimum
input voltage as low as 2V, the MP28301 allows
the system to operate directly from the battery.
o Seven Selectable Output Voltages
o Up to 700mA Output Current
o 1.5MHz Switching Frequency in
Continuous Conduction Mode (CCM)
o 100% Duty Cycle in Dropout
o 0.25Ω and 0.25Ω Internal Power
MOSFET Switches
o Cycle-by-Cycle Over-Current Protection
(OCP)
o Short-Circuit Protection (SCP) with
Hiccup Mode
100mA LDO
o Ultra-Low IQ: 300nA
o 2.0V to 5.5V Operating Input Range
o Three Selectable Output Voltages
o Over-Temperature Protection (OTP)
Available in a QFN-12 (2mmx2mm)Package
The constant-on-time (COT) control scheme
provides fast transient response, high light-load
efficiency, and requires minimal capacitance.
The regulation is made tight by integrating an
error amplifier to correct the output voltage.
A 100mA LDO regulator provides easy system
configuration with a clean output voltage.
The CTRL pins control the on/off and output
voltage selection functions.
Fault protection features include under-voltage
lockout (UVLO), over-current protection (OCP),
and thermal shutdown.
APPLICATIONS
The MP28301 requires a minimal number of
readily available, standard, external components
and is available in a small QFN-12 (2mmx2mm)
package.
Wearables
IoT Devices
Portable Instruments
Battery-Powered Devices
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
VIN1:
3.6V
L1
Efficiency vs. Load Current
VOUT=1.8V
VOUT1
1.8V/700mA
SW1
VIN1
2.2µH
100
C1
10µF
C2
10µF
OUT1
CTRL1
CTRL2
CTRL3
90
80
PG1
MP28301GG
70
VIN2:
3.6V
VOUT2
1.2V/100mA
VIN=2V
60
50
40
30
VIN=2.5V
VIN=3.0V
VIN=3.6V
VIN=4.2V
VIN=5.0V
VIN2
OUT2
C3
1µF
C4
1µF
CTRL4
CTRL5
GND
0.001
0.1
10
1000
IOUT (mA)
MP28301 Rev. 1.0
1/3/2018
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2018 MPS. All Rights Reserved.
1
MP28301 – ULTRA-LOW IQ, STEP-DOWN CONVERTER
ORDERING INFORMATION
Part Number*
Package
Top Marking
MP28301GG
QFN-12 (2mmx2mm)
See Below
* For Tape & Reel, add suffix –Z (e.g. MP28301GG–Z)
TOP MARKING
EG: Product code of MP28301GG
Y: Year code
LLL: Lot number
PACKAGE REFERENCE
TOP VIEW
OUT2 VIN2
12
11
OUT1
VIN1
SW
1
2
3
4
10
9
CTRL1
CTRL2
CTRL3
8
GND
PG1
7
5
6
CTRL4 CTRL5
QFN-12 (2mmx2mm)
MP28301 Rev. 1.0
1/3/2018
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2018 MPS. All Rights Reserved.
2
MP28301 – ULTRA-LOW IQ, STEP-DOWN CONVERTER
ABSOLUTE MAXIMUM RATINGS (1)
Supply voltage (VIN1/2)................................. 6V
VSW1.....................................................................
-0.3V (-5V for <10ns) to
Thermal Resistance (4) θJA
QFN-12 (2mmx2mm)............. 80....... 16... °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 regulator to go into thermal shutdown. Internal thermal
shutdown circuitry protects the device from permanent
damage.
6V (8V for <10ns or 10V for <3ns)
All other pins.....................................-0.3V to 6V
Continuous power dissipation (TA=+25°C)
(2)
................................................................1.6W
Junction temperature ................................150°C
Lead temperature .....................................260°C
Storage temperature................ -65°C to +150°C
3) The device is not guaranteed to function outside of its operating
conditions.
4) Measured on JESD51-7, 4-layer PCB.
Recommended Operating Conditions (3)
Supply voltage (VIN1/2)..................2.0V to 5.5V
Operating junction temp. (TJ)... -40°C to +125°C
MP28301 Rev. 1.0
1/3/2018
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2018 MPS. All Rights Reserved.
3
MP28301 – ULTRA-LOW IQ, STEP-DOWN CONVERTER
ELECTRICAL CHARACTERISTICS
VIN1 = 3.6V, VIN2 = 3.6V, TJ = -40°C to +125°C, typical value is tested at TJ = 25°C. The limit over
temperature is guaranteed by characterization, unless otherwise noted.
Parameters
Symbol Condition
Min
Typ
Max
Units
Buck Section
Input voltage range(5)
VIN1
2.0
5.5
V
V
Under-voltage lockout threshold
rising for buck
VIN1_UVLO_R
1.65
1.8
1.95
Under-voltage lockout threshold
hysteresis for buck
VIN1_UVLO_H
150
70
mV
nA
Supply current (shutdown)
ISD_25
CTRL1/2/3=0V, or EN=0
No load, CTRL4/5=0V,
CTRL1/2/3=H/L/H,
Supply current (quiescent)
IQ_BUCK
500
nA
OUT1=1.8V, not switching
High-side switch on resistance
Low-side switch on resistance
RDSON1_H
RDSON1_L
0.25
0.25
Ω
Ω
CTRL1/2/3 = 0V, VIN1=5.5V,
VSW = 0V and 5.5V, TJ=25°C
Switch leakage current
ILK_SW1
ILIM1_H
ILIMV1_L
-100
1000
750
0
100
nA
mA
mA
High-side current limit
1200
920
1400
Low-side switch valley current
(sourcing)
Low-side switch zero crossing
current
IZCD
0
20
mA
On time
TON
VIN2
VIN1=3.6V, VOUT=1.8V
When VIN1>VIN1_UVLO
280
2.0
330
380
5.5
ns
V
Input voltage range for LDO(5)
Minimum on time
Minimum off time
Maximum duty cycle(5)
TMIN_ON
TMIN_OFF
DMAX
60
ns
ns
%
100
100
CTRL1/2/3=H/L/H,
IOUT=0.1A
TJ=25°C,
1.782 1.800 1.818
Output voltage accuracy
VOUT
V
CTRL1/2/3=H/L/H, TJ=-40°C to
85°C, IOUT=0.1A
1.773
-1
1.827
1
From 2.5V to 5.5V, from 0A to
700mA
Line/load regulation of buck(6)
%
LDO Section
No load, CTRL1/2/3 = 0V,
Supply current (quiescent)
IQ_LDO CTRL4/5 = L/H, no load current
from VIN2
300
nA
Supply current (shutdown)
Voltage dropout of LDO
Dropout resistance
ISD_25 CTRL4/5 = 0V, or EN = 0
50
50
nA
mV
Ω
VDP
RDP
ILDO = 0.1A, VOUT = 3.0V
0.5
MP28301 Rev. 1.0
www.MonolithicPower.com
4
1/3/2018
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2018 MPS. All Rights Reserved.
MP28301 – ULTRA-LOW IQ, STEP-DOWN CONVERTER
ELECTRICAL CHARACTERISTICS(continued)
VIN1 = 3.6V, VIN2 = 3.6V, TJ = -40°C to +125°C, typical value is tested at TJ = 25°C. The limit over
temperature is guaranteed by characterization, unless otherwise noted.
Parameters
Symbol Condition
Min
Typ
Max
Units
Current limit of LDO
ILIM_LDO
150
200
mA
CTRL4/5=H/L, TJ=25°C,
1.188 1.200 1.212
1.182 1.218
CTRL4/5=H/L,TJ=-40°C to 85°C
DC output voltage accuracy
VOUT
V
Internal reference,
TA=-40°C to 85°C
0.591 0.600 0.609
0
Line regulation of LDO
Load regulation of LDO
IOUT=1mA
%
%
IOUT=1mA to 100mA
10Hz, IOUT=100mA
100Hz, IOUT=100mA
1kHz, IOUT=100mA
-1
1
40
20
15
Power supply rejection ratio(6)
PSRR
dB
Both Buck and LDO
Buck
110
2
µs
Internal soft-start time
TSS
LDO: VOUT = 3.0V, IOUT = 100mA,
Co = 1µF
ms
Discharge resistance during
enable off
RDIS_OFF
50
Ω
CTRL high logic
CTRL low logic
CTRLH
CTRLL
1.2
V
V
0.4
VCTRL = 3.6V
VCTRL = 0
1
0
CTRL input current
ICTRL
nA
VEN = 0V
0
CTRL 1/2/3 turn-on delay
CTRL4/5turn-on delay
TD123
TD45
200
300
μs
Not present when CTRL is high to
avoid IQ impact
CTRL pull-down resistor
RPD
2
MΩ
Power good threshold
Power good hysteresis
Power good delay
PG
FB with respect to the regulation
90
10
75
%
%
PGHys
PGTD
μs
Power good sink current
capability
VPG_LO
Sink 1mA
0.4
10
V
Power good leakage current
Thermal shutdown (5)
Thermal hysteresis (5)
IPGLK
TSD
VPGBUS=1.8V
nA
°C
°C
150
30
TSDHY
NOTES:
5) Guaranteed by design.
6) Data derived from bench characterization test.
MP28301 Rev. 1.0
1/3/2018
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2018 MPS. All Rights Reserved.
5
MP28301 – ULTRA-LOW IQ, STEP-DOWN CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS
VIN1=3.6V, VOUT1=1.8V, L1=2.2µH, CIN1=10µF, COUT1=10µF, VIN2=3.6V, VOUT2=1.2V, CIN2=1µF,
COUT2=1µF, TA = +25°C, unless otherwise noted.
Efficiency vs. Load Current
VOUT=1.2V
Efficiency vs. Load Current
VOUT=1.8V
100
90
80
70
60
50
40
30
100
90
80
70
60
50
40
30
VIN=2V
VIN=2V
VIN=2.5V
VIN=3.0V
VIN=3.6V
VIN=4.2V
VIN=5.0V
VIN=2.5V
VIN=3.0V
VIN=3.6V
VIN=4.2V
VIN=5.0V
0.001
0.1
10
1000
0.001
0.1
10
1000
IOUT (mA)
IOUT (mA)
Efficiency vs. Load Current
VOUT=3.3V
Line Regulation vs. Load Current
100
90
80
70
60
50
40
30
1.00%
0.75%
0.50%
0.25%
0.00%
-0.25%
-0.50%
-0.75%
-1.00%
Io=1mA
Io=150mA
Io=300mA
VIN=3.6V
VIN=4.2V
VIN=5.0V
2
3
4
5
6
0.001
0.1
10
1000
IOUT (mA)
VIN (V)
Load Regulation vs. Load Current
VIN=5V
Load Regulation vs. Load Current
VIN=3.6V
1.00%
0.75%
0.50%
0.25%
0.00%
-0.25%
-0.50%
-0.75%
-1.00%
1.00%
0.75%
0.50%
0.25%
0.00%
-0.25%
-0.50%
-0.75%
-1.00%
Vo=1.2V
Vo=1.8V
Vo=3.3V
Vo=1.2V
Vo=1.8V
Vo=3.3V
0.001 0.01
0.1
1
10
100 1000
0.001
0.1
10
1000
IOUT (mA)
IOUT (mA)
MP28301 Rev. 1.0
1/3/2018
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2018 MPS. All Rights Reserved.
6
MP28301 – ULTRA-LOW IQ, STEP-DOWN CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS(continued)
VIN1=3.6V, VOUT1=1.8V, L1=2.2µH, CIN1=10µF, COUT1=10µF, VIN2=3.6V, VOUT2=1.2V, CIN2=1µF,
COUT2=1µF, TA = +25°C, unless otherwise noted.
Buck Quiescent Current vs. Input
Voltage
LDO Quiescent Current vs. Input
Voltage
400
350
300
250
200
150
100
50
700
600
500
400
300
200
100
0
0
2
3
4
5
6
6
6
2
3
4
5
6
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
Buck Shutdown Current vs. Input
Voltage
LDO Shutdown Current vs. Input
Voltage
100
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
2
3
4
5
2
3
4
5
6
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
Buck Current Limit vs. VIN
LDO Current Limit vs. VIN
400
300
200
100
0
1,500
1,400
1,300
1,200
1,100
1,000
900
800
700
600
500
400
300
200
100
0
2
3
4
5
2
3
4
5
6
VIN (V)
VIN (V)
MP28301 Rev. 1.0
1/3/2018
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2018 MPS. All Rights Reserved.
7
MP28301 – ULTRA-LOW IQ, STEP-DOWN CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS(continued)
VIN1=3.6V, VOUT1=1.8V, L1=2.2µH, CIN1=10µF, COUT1=10µF, VIN2=3.6V, VOUT2=1.2V, CIN2=1µF,
COUT2=1µF, TA = +25°C, unless otherwise noted.
Buck VIN UVLO Rising Threshold vs.
Temperature
CTRL Rising and Falling Threshold
vs. Temperature
3
2.5
2
1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
Rising
Falling
1.5
1
Rising
Falling
0.5
0
-60
-10
40
90
-60
-10
40
90
TEMPERATURE (°C)
TEMPERATURE (°C)
Reference Voltage vs. Temperature
Buck Current Limit vs. Temperature
1,300
1,200
1,100
1,000
900
800
700
600
500
400
300
200
100
0
0.700
0.650
0.600
0.550
0.500
0.450
0.400
0.350
0.300
-60
-10
40
90
-60
-10
40
90
TEMPERATURE (°C)
TEMPERATURE (°C)
LDO Current Limit vs. Temperature
Frequency vs. Temperature
2.0
1.5
1.0
0.5
0.0
400
300
200
100
0
-60
-10
40
90
-60
-10
40
90
TEMPERATURE (°C)
TEMPERATURE (°C)
MP28301 Rev. 1.0
1/3/2018
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2018 MPS. All Rights Reserved.
8
MP28301 – ULTRA-LOW IQ, STEP-DOWN CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS(continued)
VIN1=3.6V, VOUT1=1.8V, L1=2.2µH, CIN1=10µF, COUT1=10µF, VIN2=3.6V, VOUT2=1.2V, CIN2=1µF,
COUT2=1µF, TA = +25°C, unless otherwise noted.
LDO VDROP vs. Temperature
LDO current=0.1A, VOUT=3V
TRISINGvs. Output Current
80
70
60
50
40
30
20
10
0
8
7
6
5
4
3
2
1
0
Vo=1.2V
Vo=3.3V
0
100
200
300
400
-60
-10
40
90
OUTPUT CURRENT (mA)
TEMPERATURE (°C)
Output Current Derating vs. Ambient
Temperature
TJ≤ 125°C
1,000
900
800
700
600
500
400
300
200
100
0
Vin=5V, Vo=3.3V
Vin=5V, Vo=1.2V
-60 -40 -20
0
20 40 60 80 100
AMBIENT TEMPERATURE (°C)
MP28301 Rev. 1.0
1/3/2018
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2018 MPS. All Rights Reserved.
9
MP28301 – ULTRA-LOW IQ, STEP-DOWN CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS(continued)
VIN1=3.6V, VOUT1=1.8V, L1=2.2µH, CIN1=10µF, COUT1=10µF, VIN2=3.6V, VOUT2=1.2V, CIN2=1µF,
COUT2=1µF, TA = +25°C, unless otherwise noted.
Steady State
IOUT1=0A
Steady State
IOUT1=0.7A
CH1:
VOUT1/AC
20mV/div.
CH2: VIN1
5V/div.
CH1:
VOUT1/AC
10mV/div.
CH2: VIN1
5V/div.
CH3: VSW
2V/div.
CH3: VSW
2V/div.
CH4: IL
CH4: IL
100mA/div.
500mA/div.
400ms/div.
1µs/div.
Steady State
VOUT1=3.3V, IOUT1=0A
Steady State
VOUT1=3.3V, IOUT1=0.3A
CH1:
VOUT1/AC
10mV/div.
CH2: VIN1
5V/div.
CH1:
VOUT1/AC
20mV/div.
CH2: VIN1
5V/div.
CH3: VSW
2V/div.
CH3: VSW
2V/div.
CH4: IL
CH4: IL
200mA/div.
200mA/div.
40ms/div.
1µs/div.
CTRL On
IOUT1=0A
CTRL On
IOUT1=0.7A
CH1: VOUT1
2V/div.
CH1: VOUT1
2V/div.
CH2: VCTRL1/3
5V/div.
CH2:
VCTRL1/3
5V/div.
CH3: VSW
2V/div.
CH3: VSW
2V/div.
CH4: IL
CH4: IL
500mA/div.
500mA/div.
400µs/div.
400µs/div.
MP28301 Rev. 1.0
1/3/2018
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2018 MPS. All Rights Reserved.
10
MP28301 – ULTRA-LOW IQ, STEP-DOWN CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS(continued)
VIN1=3.6V, VOUT1=1.8V, L1=2.2µH, CIN1=10µF, COUT1=10µF, VIN2=3.6V, VOUT2=1.2V, CIN2=1µF,
COUT2=1µF, TA = +25°C, unless otherwise noted.
CTRL Off
IOUT1=0A
CTRL Off
IOUT1=0.3A
CH1: VOUT1
2V/div.
CH1: VOUT1
2V/div.
CH2: VCTRL1/3
5V/div.
CH2:
VCTRL1/3
5V/div.
CH3: VSW
2V/div.
CH3: VSW
2V/div.
CH4: IL
CH4: IL
200mA/div.
200mA/div.
400µs/div.
40µs/div.
PG On
IOUT1=0A
PG On
IOUT1=0.7A
CH1: VOUT1
2V/div.
CH1: VOUT1
2V/div.
CH2: VPG
5V/div.
CH2: VPG
5V/div.
CH3: VSW
2V/div.
CH3: VSW
2V/div.
CH4: IL
500mA/div.
CH4: IL
500mA/div.
2ms/div.
2ms/div.
PG Off
IOUT1=0A
PG Off
IOUT1=0.7A
CH1: VOUT1
2V/div.
CH1: VOUT1
2V/div.
CH2: VPG
5V/div.
CH2: VPG
5V/div.
CH3: VSW
2V/div.
CH3: VSW
2V/div.
CH4: IL
CH4: IL
500mA/div.
500mA/div.
10ms/div.
4ms/div.
MP28301 Rev. 1.0
1/3/2018
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2018 MPS. All Rights Reserved.
11
MP28301 – ULTRA-LOW IQ, STEP-DOWN CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS(continued)
VIN1 = 3.6V, VOUT1= 1.8V, L1 = 2.2µH, CIN1 = 10µF, COUT1= 10µF, VIN2 = 3.6V, VOUT2 = 1.2V, CIN2= 1µF,
COUT2= 1µF, TA = +25°C, unless otherwise noted.
Load Transient
IOUT1=30-300mA, 0.25A/μs
Load Transient
IOUT1=150-300mA, 0.25A/μs
CH1:
VOUT1/AC
50mV/div.
CH1:
VOUT1/AC
20mV/div.
CH2: VIN1
5V/div.
CH2: VIN1
5V/div.
CH3: VSW
2V/div.
CH3: VSW
2V/div.
CH4: IOUT
200mA/div.
CH4: IOUT
200mA/div.
100µs/div.
100µs/div.
Short-Circuit Enter
Short-Circuit Steady
CH1: VOUT1
2V/div.
CH1: VOUT1
2V/div.
CH2: VIN1
5V/div.
CH2: VIN1
5V/div.
CH3: VSW
2V/div.
CH3: VSW
2V/div.
CH4: IL
500mA/div.
CH4: IL
500mA/div.
1ms/div.
1ms/div.
Short-Circuit Recovery
CTRL On
IOUT2=0A
CH1: VOUT1
2V/div.
CH1: VOUT2
1V/div.
CH2: VIN1
5V/div.
CH2: VCTRL5
5V/div.
CH3: VSW
2V/div.
CH3: VIN2
5V/div.
CH4: IOUT2
500mA/div.
CH4: IL
500mA/div.
1ms/div.
1ms/div.
MP28301 Rev. 1.0
1/3/2018
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2018 MPS. All Rights Reserved.
12
MP28301 – ULTRA-LOW IQ, STEP-DOWN CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS(continued)
VIN1 = 3.6V, VOUT1= 1.8V, L1 = 2.2µH, CIN1 = 10µF, COUT1= 10µF, VIN2 = 3.6V, VOUT2 = 1.2V, CIN2= 1µF,
COUT2= 1µF, TA = +25°C, unless otherwise noted.
CTRL On
IOUT2=0.1A
CTRL Off
IOUT2=0A
CH1: VOUT2
1V/div.
CH1: VOUT2
1V/div.
CH2: VCTRL5
5V/div.
CH2: VCTRL5
5V/div.
CH3: VIN2
5V/div.
CH3: VIN2
5V/div.
CH4: IOUT2
100mA/div.
CH4: IOUT2
100mA/div.
1ms/div.
1ms/div.
CTRL Off
IOUT2=0.1A
VIN On
IOUT2=0A
CH1: VOUT2
1V/div.
CH1: VOUT2
1V/div.
CH2: VCTRL5
5V/div.
CH2: VCTRL5
5V/div.
CH3: VIN2
5V/div.
CH3: VIN2
5V/div.
CH4: IOUT2
CH4: IOUT2
100mA/div.
100mA/div.
1ms/div.
4ms/div.
VIN Off
IOUT2=0A
VIN On
IOUT2=0.1A
CH1: VOUT2
1V/div.
CH1: VOUT2
1V/div.
CH2: VCTRL5
5V/div.
CH2: VCTRL5
5V/div.
CH3: VIN2
5V/div.
CH3: VIN2
5V/div.
CH4: IOUT2
CH4: IOUT2
100mA/div.
100mA/div.
4ms/div.
20ms/div.
MP28301 Rev. 1.0
1/3/2018
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2018 MPS. All Rights Reserved.
13
MP28301 – ULTRA-LOW IQ, STEP-DOWN CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS(continued)
VIN1 = 3.6V, VOUT1= 1.8V, L1 = 2.2µH, CIN1 = 10µF, COUT1= 10µF, VIN2 = 3.6V, VOUT2 = 1.2V, CIN2= 1µF,
COUT2= 1µF, TA = +25°C, unless otherwise noted.
VIN Off
IOUT2=0.1A
Buck+LDO
VIN=3.6V, VOUT1=1.8V, VIN2=VIN1,
VOUT2=1.2V, IOUT1=700mA, IOUT2=100mA
CH1: Buck
VOUT1
CH1: VOUT2
1V/div.
2V/div.
CH2: LDO
VOUT2
CH2: VCTRL5
5V/div.
1V/div.
CH3: VIN2
5V/div.
CH3: VSW
2V/div.
CH4: LDO
CH4: IOUT2
100mA/div.
IOUT2
100mA/div.
4ms/div.
1µs/div.
MP28301 Rev. 1.0
1/3/2018
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2018 MPS. All Rights Reserved.
14
MP28301 – ULTRA-LOW IQ, STEP-DOWN CONVERTER
PIN FUNCTIONS
Pin#
Name
Description
Output voltage sensing of the step-down switcher. Connect the load to OUT1. An output
capacitor is needed to decrease the output voltage ripple.
1
OUT1
Step-down switcher control signal. Adjust the step-down switcher output voltage value
dynamically. Do not float the CTRL pins during application. When used, ensure that the
CTRL voltage is not lower than VIN1.If unused, tie CTRL to GND. Refer to Table1 on page
17 to set the buck output value.
2
3
4
5
CTRL1
CTRL2
CTRL3
CTRL4
LDO control signal. Adjust the LDO output voltage value dynamically. Do not float CTRL
during application. When used, ensure that the CTRL voltage is not lower than VIN2. If
unused, tie CTRL to GND. Refer to Table 1 on page 17 to set the LDO output value.
6
CTRL5
7
8
PG1
Power good for the step-down switcher.PG1 is an open-drain output.
GND
Ground.
Switch output for the step-down switcher. SW is the drain of the internal, high-side, P-
channel MOSFET. Connect the inductor to SW to complete the converter.
9
SW
VIN1
VIN2
OUT2
Input supply voltage to the step-down switcher. Place a small decoupling capacitor as
close to VIN1 and GND as possible.
10
11
12
Input supply voltage to the LDO. Place a small decoupling capacitor as close to VIN2 and
GND as possible.
Output voltage sensing of LDO.OUT2 is the output of the linear regulator. Bypass OUT2
to GND with a 1μF capacitor.
MP28301 Rev. 1.0
1/3/2018
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2018 MPS. All Rights Reserved.
15
MP28301 – ULTRA-LOW IQ, STEP-DOWN CONVERTER
BLOCK DIAGRAM
VIN1
+
COMP
VTH
CTRL1
Ramp
-
+
PWM
Summer
CTRL2
CTRL3
Main
Switch
(PCH)
COMP
Buck
CTRL
-
-
E.A.
RST
Buck Control
+
PDRV
PWM
PWM
Sleep
Constant
-
On Time
SW
&
+
Sleep Mode
Synchronous
Rectifier
Low IQ
COMP
Driver
OUT1
(
NCH)
-
NDRV
Ref
&
Soft Start
Sleep
+
COMP
-
Z
Hi
GND
-
PG Control
PG1
Sleep
LDO Control
OUT2
-
COMP
Sleep Mode
OCP
+
CTRL4
CTRL5
OUT2
LDO
CTRL
Main
Switch
+
-
E.A.
VIN2
Figure 1: Functional Block Diagram
MP28301 Rev. 1.0
1/3/2018
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2018 MPS. All Rights Reserved.
16
MP28301 – ULTRA-LOW IQ, STEP-DOWN CONVERTER
Control (CTRL1/2/3)
OPERATION
The control pins (CTRL1/2/3) are used to control
The MP28301 has an ultra-low, quiescent
current, step-down converter, and low-dropout
regulator. The step-down converter has 500nA
of quiescent current, allowing the MP28301 to
achieve extremely high efficiency at an ultra-low
load current. The 300nA low-IQ LDO provides
easy system configuration.
start-up and set the output voltages of the step-
down regulator. When CTRL1/2/3 are low, the
step-down switcher of the MP28301 is disabled.
Once either one of CTRL1/2/3 are pulled high,
the switcher is enabled. The output voltage is set
depending on which CTRL pin is pulled high.
This applies for CTRL4/5 for the LDO regulator
as well. The output voltage is programmable
according toTable1.
Constant-On-Time (COT) Control of the Buck
The MP28301 use a constant-on-time (COT)
control scheme to regulate the output voltage.
The one-shot on-timer is controlled by the input
and output voltages. At different input and output
voltage conditions, the switching frequency is
fairly stable, which helps with the system design.
The switching frequency is around 1.5MHz,
typically. With COT control, the output ripple is
small, and the load transient response is fast.
COT control minimizes the number of input and
output capacitors. The MP28301 enters pulse-
skip mode automatically when the low-side
switch current reaches the 0A threshold. Pulse-
skip mode helps improve light-load efficiency.
The COT control scheme provides a seamless
transition from pulse-width modulation (PWM)
mode to pulse-frequency modulation (PFM)
mode and vice versa.
Table 1: CTRL vs. Output Voltages
Step-Down Switcher
CTRL3
CTRL2
CTRL1
OUT1
Disabled
0.8V
1.0V
1.2V
1.5V
1.8V
2.5V
3.3V
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
LDO
CTRL5
CTRL4
OUT2
Disabled
1.2V
2.5V
3.0V
0
0
1
1
0
1
0
1
Light-Load Operation
The output voltage can be programmable during
operation and supports dynamic output voltage
scaling. CTRL cannot be floating. Any used
CTRL voltage cannot be less than VIN. Any
unused CTRL pin must be tied to GND.
When the load current decreases and the low-
side switch current reaches the 0A threshold,
both the high-side and low-side switches are
turned off. Output energy is provided by the
output capacitors during this period until the
output voltage drops, reaches the regulation
voltage, and triggers another on pulse.
Soft Start (SS)
When the converter is enabled, the internal
reference is powered up. After a certain amount
of delay time, the device enters soft start (SS).
The step-down switcher output voltage ramps up
to the regulation voltage to around 110µs. The
LDO’s SS time is about 2ms when VOUT2is 3V
and COUT2 is 1μF.
The switching frequency in PFM mode depends
on the load current. The switching frequency is
lower when the load current is lighter. With PFM
control at light-load mode plus the ultra-low
quiescent operation current, the MP28301 can
achieve the highest efficiency at extremely low
load. This helps extend the charge cycle of any
battery-powered system.
Power Good (PG) Indicators of the Buck
The MP28301 has an open-drain output power
good (PG) indicator with a maximum RDS(ON) of
less than 400Ω. PG requires an external pull-up
resistor (100~500kΩ) for power good indication.
This resistor can be pulled up to VIN or tied to
CTRL if the CTRL voltages do not need to be
adjusted dynamically.
When the buck works in light-load operation, it
needs at least 5µs to exit light load. When a
large, quick, and sharp load increase occurs in
light-load mode, the output voltage drops during
the exit transition. The LDO exits light-load mode
after a load of >20mA.
MP28301 Rev. 1.0
1/3/2018
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2018 MPS. All Rights Reserved.
17
MP28301 – ULTRA-LOW IQ STEP-DOWN CONVERTER
The PG comparator is active when the device is
enabled. The comparator is driven to a high
impedance once the output voltage trips the PG
threshold(typically 90% of the regulation
voltage)and is pulled low once the output voltage
falls below the PG hysteresis threshold (typically
80% of the regulation voltage). The output is also
pulled low if the input voltage is lost or the part is
disabled.
Current Limit
The MP28301 has an internal current limit for the
step-down converter and LDO converter.
The high-side switch current is monitored cycle-
by-cycle and is compared with the current-limit
threshold. Once the current-limit comparator is
triggered, the high-side switch is turned off, and
the low-side switch is turned on, reducing the
inductor current. Until the low-side switch current
is lower than the low-side current limit, the high-
side switch is not allowed to turn on again.
Output Discharge Function
Both the step-down regulator and the LDO
implement the output discharge function once
they are disabled. This feature prevents residual
charge voltages on the capacitors, which may
interfere with a proper power-up of the system.
When the input voltage is high and the related
converters are disabled, the output discharge is
active.
If the current of the LDO reaches the current
limit, the LDO current clamps the current at the
current limit level, and the output regulation is
lost.
Short Circuit and Recovery
If the output voltage of the buck converter is
shorted to GND, the under-voltage is detected
and the MP28301 enters hiccup mode for the
buck converter. The short-circuit condition can
also be triggered when the output voltage is
lower than 50% of the regulation output voltage
and when the current limit is reached
simultaneously. The buck disables the output
power stage, discharges the output voltage, and
then attempts to recover after a hiccup. If the
short-circuit condition still remains, the MP28301
repeats this operation until the short circuit is
removed and the output rises back to the
regulation levels.
100% Duty Cycle Mode
When the input voltage reduces and is lower
than the regulation output voltage, the output
voltage drops, and the on time increases.
Further reducing the input voltage drives the
MP28301 into 100% duty cycle mode. The high-
side switch is always on, and the output voltage
is determined by the load current times the
RDS(ON) composed by the high-side switch and
inductor.
LDO Operation
The low-dropout regulator is enabled when
either one or both of CTRL4 or CTRL5 is high
and the input voltage (VIN2) is higher than the
UVLO threshold. CTRL4 and CTRL5 can be
programmed to one of three preset output
voltages.
When a short circuit occurs in the LDO, the
mechanism that follows is similar to the current-
limit condition. The current is clamped at the
current-limit level.
Thermal Shutdown Circuit and Recovery
When the thermal shutdown signal is triggered,
the MP28301 turns off and restarts when the
temperature falls below the thermal hysteresis.
MP28301 Rev. 1.0
1/3/2018
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2018 MPS. All Rights Reserved.
18
MP28301 – ULTRA-LOW IQ, STEP-DOWN CONVERTER
Estimate the RMS current in the input capacitor
with Equation (3):
APPLICATION INFORMATION
Selecting the Inductor
VOUT
VOUT
1
Most applications work best with
a
1-
(3)
IC1 ILOAD
V
V
IN
IN
2.2µH inductor. Select an inductor with a DC
resistance less than 200mΩ to optimize
efficiency.
The worst-case scenario occurs at VIN = 2VOUT
,
shown in Equation (4):
High-frequency, switch-mode power supplies
with a magnetic device have strong electronic
magnetic inference for the system. Any
unshielded power inductor should be avoided
since it has poor magnetic shielding. Metal alloy
or multiplayer chip power shield inductors are
recommended for the application since they can
decrease influence effectively. Table 2 lists
some recommended inductors.
ILOAD
(4)
IC1
2
For simplification, choose an input capacitor with
an RMS current rating greater than half of the
maximum load current. The input capacitor can
be electrolytic, tantalum, or ceramic. When using
electrolytic or tantalum capacitors, add a small,
high-quality, 0.1μF, ceramic capacitor as close
to the IC as possible. When using ceramic
capacitors, ensure that they have enough
capacitance to provide a sufficient charge to
prevent excessive voltage ripple at the input. The
input voltage ripple caused by the capacitance
can be estimated with Equation (5):
Table 2: Recommended Inductors
Manufacturer
Inductance
Package Manufacturer
P/N
DFE201612P-
2R2M
2.2µH
2.2µH
2016
2012
the
Tokyo
Wurth
74479775222A
ILOAD VOUT
V
OUT
IN
(5)
V
1
IN
For
most
designs,
inductance
fS C1
VIN
V
value can be calculated with Equation (1):
Selecting the Output Capacitor
VOUT (V VOUT
)
IN
The output capacitor limits the output voltage
ripple and ensures a stable regulation loop.
Select an output capacitor with low impedance at
the switching frequency. For most applications,
a 10µF capacitor is sufficient. Estimate the
output voltage ripple with Equation (6):
(1)
L1
V IL fOSC
IN
Where ∆IL is the inductor ripple current.
Choose the inductor current to be approximately
30% of the maximum load current. The
maximum inductor peak current can be
calculated with Equation (2):
VOUT
VOUT
1
(6)
VOUT
1
RESR
fS L1
V
8fS C2
IN
IL
2
(2)
IL(MAX) ILOAD
Where L1 is the inductor value, and RESR is the
equivalent series resistance (ESR) value of the
output capacitor.
Selecting the Input Capacitor
The input capacitor reduces the surge current
drawn from the input and the switching noise
from the device. Select an input capacitor with a
switching frequency impedance less than the
input source impedance to prevent high-
frequency switching current from passing to the
input source. Use low ESR ceramic capacitors
with X5R or X7R dielectrics with small
temperature coefficients. For most applications,
a 10μF capacitor is sufficient.
When using ceramic capacitors, the capacitance
dominates the impedance at the switching
frequency and causes most of the output voltage
ripple. For simplification, the output voltage
ripple can be estimated with Equation (7):
VOUT
V
(7)
ΔVOUT
1
OUT
IN
2
8fS L1 C2
V
The characteristics of the output capacitor also
affect the stability of the regulation system.
The input capacitor requires an adequate ripple
current rating since it absorbs the input switching
current.
MP28301 Rev. 1.0
1/3/2018
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2018 MPS. All Rights Reserved.
19
MP28301 – ULTRA-LOW IQ, STEP-DOWN CONVERTER
PCB Layout Guidelines
Efficient PCB layout of the switching power
supply and especially the high-switching
frequency converter is critical for stable
operation. If the layout is not done carefully, the
regulator could show poor line or load regulation
and stability issues. For best results, refer to
Figure 2 and follow the guidelines below.
1. Place the input capacitor as close to the IC
pins as possible for the high speed step-
down regulator to provide clean control
voltage for the chip.
2. Place the CIN1 close to VIN1 and GND to
absorb noise.
GND
GND
Vout2
Vin2 Vin1
OUT2
12
VIN2
11
1
2
3
4
10
9
OUT1
CTRL1
CTRL2
CTRL3
VIN1
SW
GND
Lout
8
GND
Bottom Layer
SW
PG1
7
Top Layer
Via
5
6
Co1
CTRL4 CTRL5
Vout1 sense
Bottom Layer
GND
GND
Vout1
PG
Figure 2: Recommended Layout
MP28301 Rev. 1.0
1/3/2018
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2018 MPS. All Rights Reserved.
20
MP28301 – ULTRA-LOW IQ, STEP-DOWN CONVERTER
TYPICAL APPLICATION CIRCUITS
VIN1:
2.0V to 5.5V
VOUT1
1.8V/700mA
L1
SW1
VIN1
2.2µH
C1
C2
10µF
10µF
OUT1
CTRL1
R1
100kΩ
CTRL2
CTRL3
PG1
MP28301GG
VIN2:
2.0V to 5.5V
VOUT2
2.5V/100mA
VIN2
OUT2
C3
1µF
C4
1µF
CTRL4
CTRL5
GND
Figure 3: Typical Application Circuit forMP28301GG
NOTE: VIN1 and VIN2 supply power dependently. VIN1 must be more than the VIN UVLO.
VIN1:
3V to 5.5V
VOUT1
2.5V/700mA
L1
2.2µH
SW1
VIN1
C1
C2
10µF
10µF
OUT1
CTRL1
CTRL2
CTRL3
R1
100kΩ
PG1
MP28301GG
VOUT2
VOUT1
2.5V/100mA
VIN2
OUT2
C3
1µF
C4
1µF
CTRL4
CTRL5
GND
Figure 4: Buck and LDO in Sequence
MP28301 Rev.0.81 1.0
1/3/2018
Preliminary Specifications Subject to Change
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2018 MPS. All Rights Reserved.
21
MP28301 – ULTRA-LOW IQ, STEP-DOWN CONVERTER
PACKAGE INFORMATION
QFN-12 (2mmx2mm)
PIN 1 ID
0.15X45º TYP
PIN 1 ID
MARKING
PIN 1 ID
INDEX AREA
TOP VIEW
BOTTOM VIEW
SIDE VIEW
NOTE:
0.15X45º
1) ALL DIMENSIONS ARE IN MILLIMETERS.
2) LEAD COPLANARITY SHALL BE 0.10
MILLIMETERS MAX.
3) JEDEC REFERENCE IS MO-220.
4) DRAWING IS NOT TO SCALE.
RECOMMENDED LAND PATTERN
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.
MP28301 Rev. 1.0
1/3/2018
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2018 MPS. All Rights Reserved.
22
相关型号：
MP28303EN-LF
Switching Regulator, Current-mode, 6A, 380kHz Switching Freq-Max, PDSO8, LEAD FREE, SOIC-8
MPS
MP28303EN-LF-Z
Switching Regulator, Current-mode, 6A, 380kHz Switching Freq-Max, PDSO8, LEAD FREE, SOIC-8
MPS
MP28311DN
Switching Regulator, Current-mode, 6.3A, 380kHz Switching Freq-Max, PDSO8, MS-012BA, SOIC-8
MPS
MP28311DN-LF
Switching Regulator, Current-mode, 6.3A, 380kHz Switching Freq-Max, PDSO8, ROHS COMPLIANT, MS-012BA, SOIC-8
MPS
MP28311DN-LF-Z
Switching Regulator, Current-mode, 6.3A, 380kHz Switching Freq-Max, PDSO8, ROHS COMPLIANT, MS-012BA, SOIC-8
MPS
MP28311DN-Z
Switching Regulator, Current-mode, 6.3A, 380kHz Switching Freq-Max, PDSO8, MS-012BA, SOIC-8
MPS
MP28311DQ
Switching Regulator, Current-mode, 6.3A, 380kHz Switching Freq-Max, 3 X 3 MM, MO-229VEED-5, QFN-10
MPS
MP28311DQ-LF
Switching Regulator, Current-mode, 6.3A, 380kHz Switching Freq-Max, 3 X 3 MM, ROHS COMPLIANT, MO-229VEED-5, QFN-10
MPS
MP28311DQ-LF-Z
Switching Regulator, Current-mode, 6.3A, 380kHz Switching Freq-Max, 3 X 3 MM, ROHS COMPLIANT, MO-229VEED-5, QFN-10
MPS
MP28311DQ-Z
Switching Regulator, Current-mode, 6.3A, 380kHz Switching Freq-Max, 3 X 3 MM, MO-229VEED-5, QFN-10
MPS
©2020 ICPDF网 联系我们和版权申明