MP4436/MP4436A
45V, 6A, Low IQ,
Synchronous Step-Down Converter
DESCRIPTION
FEATURES
The MP4436/MP4436A is a synchronous, stepdown switching regulator with a configurable
frequency and integrated internal high-side and
low-side power MOSFETs. It provides a
maximum 6A of highly efficient output, as well as
current mode control for a fast loop response.
The wide 3.3V to 45V input range
accommodates a variety of step-down
applications in an automotive input environment.
A 1.7μA shutdown mode quiescent current
allows the part to be used in battery-powered
applications.
High power conversion efficiency across a wide
load range is achieved by scaling down the
switching frequency in light-load conditions to
reduce the switching and gate driver losses.
An open-drain power good signal indicates that
the output is within 93% to 106% of its nominal
voltage.
Wide 3.3V to 45V Operating Voltage Range
6A Continuous Output Current
1.7μA Low Shutdown Supply Current
18μA Sleep Mode Quiescent Current
Internal 48mΩ High-Side and 20mΩ LowSide MOSFET
350kHz to 530kHz Configurable Switching
Frequency for Car Battery Applications
Synchronize to External Clock
Multi-Phase Capability
Out-of-Phase Synchronized Clock Output
MP4436A: Frequency Spread Spectrum
(FSS) Option for Low EMI
Symmetric VIN for Low EMI
Power Good Output
External Soft Start
100ns Minimum On Time
Selectable Advanced Asynchronous Mode
(AAM) or Forced Continuous Conduction
Mode (FCCM)
Low-Dropout Mode
Hiccup Mode for Over-Current Protection
Available in a QFN-20 (4mmx4mm)
Package
Frequency foldback helps prevent inductor
current runaway during start-up. Thermal
shutdown provides reliable, fault-tolerant
operation.
High duty cycle and low-dropout mode are
provided for automotive cold crank conditions.
APPLICATIONS
The MP4436/MP4436A is available in a QFN-20
(4mmx4mm) package.
Automotive Infotainment
Automotive Clusters
Advanced Driver Assistance Systems
(ADAS)
Industrial Power 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”, the MPS logo, and “Simple, Easy Solutions” are
registered trademarks of Monolithic Power Systems, Inc. or its subsidiaries.
MP4436/MP4436A Rev. 1.0
www.MonolithicPower.com
8/24/2020
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© 2020 MPS. All Rights Reserved.
1
MP4436/MP4436A – 5V, 6A, LOW IQ, SYNCHRONOUS STEP-DOWN CONVERTER
TYPICAL APPLICATION
Efficiency vs. Load Current
VIN
3.3 to 45V
VOUT = 3.3V, fSW = 470kHz, L = 3.3μH, AAM
VIN
BST
MODE
SYNCO
SW
MP4436/
MP4436A
F REQ
FB
PG
VCC
SS
ICS
SYNCIN
GND
EFFICIENCY (%)
VOUT
EN
100
90
80
70
60
50
40
30
20
10
0
VIN=12V
VIN=24V
VIN=36V
VIN=45V
0.1
1
10
100
1000
LOAD CURRENT (mA)
MP4436/MP4436A Rev. 1.0
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8/24/2020
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6000
2
MP4436/MP4436A – 5V, 6A, LOW IQ, SYNCHRONOUS STEP-DOWN CONVERTER
ORDERING INFORMATION
Part Number*
Package
Top Marking
MSL Rating**
MP4436GR
QFN-20 (4mmx4mm)
See Below
1
MP4436AGR
QFN-20 (4mmx4mm)
See Below
1
* For Tape & Reel, add suffix –Z (e.g. MP4436GR–Z).
**Moisture Sensitivity Level Rating.
TOP MARKING (MP4436GR and MP4436AGR)
MPS: MPS prefix
Y: Year code
WW: Week code
MP4436: Part number
LLLLLL: Lot number
PACKAGE REFERENCE
TOP VIEW
FREQ
SS
FB AGND VCC
ICS
20
19
18
15
17
16
MODE
1
14
PG
SYNCIN
2
13
SYNCO
VIN
3
12
VIN
PGND
4
11
PGND
PGND
5
10
PGND
6
7
8
9
BST
SW
SW
EN
QFN-20 (4mmx4mm)
MP4436/MP4436A Rev. 1.0
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8/24/2020
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3
MP4436/MP4436A – 5V, 6A, LOW IQ, SYNCHRONOUS STEP-DOWN CONVERTER
PIN FUNCTIONS
Pin #
1
2
3, 12
Name
Description
AAM or FCCM select pin. Pull the MODE pin high to force the part into forced continuous
MODE conduction mode (FCCM). Pull MODE low for advanced asynchronous mode (AAM) under
light-load conditions. Do not float MODE.
SYNC input. Connect a 51kΩ resistor between SYNCIN and GND. Apply a 350kHz to 530kHz
clock signal to this pin to synchronize the internal oscillator frequency to the external clock.
SYNCIN
This pin is also used for multi-phase operation. Connect SYNCIN to GND if it is not used. Do
not float SYNCIN.
Input supply. VIN supplies power to all the internal control circuitry and to the power switch
VIN
connected to SW. To minimize switching spikes, it is recommended to place a decoupling
capacitor to ground close to VIN.
4, 5,
10, 11
PGND
6
BST
7, 8
SW
9
EN
13
SYNCO
14
PG
15
ICS
16
VCC
17
AGND
18
FB
19
SS
20
FREQ
Power ground.
Bootstrap. BST is the positive power supply for the high-side MOSFET driver connected to
SW. Connect a bypass capacitor between BST and SW. See the Setting the BST Capacitor
section on page 31 to calculate the size of this capacitor.
Switch node. SW is the output of the internal power switch.
Enable. Pull this pin below the specified threshold (0.85V) to shut down the chip. Pull EN
above the specified threshold (1V) to enable the chip.
SYNC output. Output a clock signal 180° out of phase with the internal oscillator signal or
opposite to the clock signal applied at the SYNCIN pin. Float SYNCO if it is not used.
Power good indicator. The output of PG is an open drain. If PG is used, connect a pull-up
resistor to the power source. PG goes high if the output voltage is within 93% to 106% of the
nominal voltage, and goes low if the output voltage is above 107.5% or below 91% of the
nominal voltage.
Current sharing pin. In a multi-phase application, connect the ICS pins of the ICs in parallel
to improve current sharing between different phases. Do not float ICS. In a single-phase
application, connect ICS to the VCC or VOUT pin, and ensure that the voltage is above 3V.
Bias supply. VCC supplies power to the internal control circuit and gate drivers. A decoupling
capacitor to ground must be placed close to this pin. See the Setting the VCC Capacitor
section on page 31 to calculate the size of this capacitor.
Analog ground.
Feedback input. Connect FB to the center point of the external resistor divider from the
output to AGND to set the output voltage. The feedback threshold voltage is 0.815V. Place
the resistor divider as close to FB as possible. Avoid placing vias on the FB traces.
Soft start input. Place a capacitor from SS to GND to set the soft-start period. The
MP4436/MP4436A sources 6µA from the SS pin to the soft-start capacitor during start-up. As
the SS voltage rises, the feedback threshold voltage increases to limit inrush current during
start-up.
Switching frequency program. Connect a resistor from this pin to ground to set the
switching frequency. To set the frequency, see the fSW vs. RFREQ curve in the Typical
Performance Characteristics (TPC) section on page 14.
MP4436/MP4436A Rev. 1.0
www.MonolithicPower.com
8/24/2020
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MP4436/MP4436A – 5V, 6A, LOW IQ, SYNCHRONOUS STEP-DOWN CONVERTER
θJA
θJC
ABSOLUTE MAXIMUM RATINGS (1)
Thermal Resistance
VIN, EN .........................................-0.3V to +50V
SW ............................... -0.3V to VIN (MAX) + 0.3V
BST ...................................................... VSW + 6V
All other pins ...................................-0.3V to +6V
Continuous power dissipation (TA = 25°C) (2)
QFN-20 (4mmx4mm) ............................... 2.84W
Operating junction temperature ............. +150°C
Lead temperature .................................. +260°C
Storage temperature ................ -65°C to +150°C
QFN-20 (4mmx4mm)
JESD51-7 (4)............................44.........9....°C/W
EVQ4436-R-00A (5)..................23........2.5..°C/W
ESD Ratings
Human body model (HBM) ....................... ±2kV
Charged device model (CDM) ................. ±750V
Recommended Operating Conditions
Supply voltage (VIN) ......................... 3.3V to 45V
Operating junction temp (TJ) -40°C to +125°C (3)
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 can lead to excessive die temperature, and the
regulator may into thermal shutdown. Internal thermal
shutdown circuitry protects the device from permanent
damage.
3) The device may be able to support an operating junction
temperature above 125°C. Contact MPS for details.
4) Measured on JESD51-7, 4-layer PCB.
5) Measured on EVQ4436-R-00A, 9cmx9cm, 4-layer PCB.
MP4436/MP4436A Rev. 1.0
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8/24/2020
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MP4436/MP4436A – 5V, 6A, LOW IQ, SYNCHRONOUS STEP-DOWN CONVERTER
ELECTRICAL CHARACTERISTICS
VIN = 12V, VEN = 2V, TJ = -40°C to +125°C (6), typical values are at TJ = 25°C, unless otherwise noted.
Parameter
VIN UVLO rising
threshold
VIN UVLO falling
threshold
VIN UVLO
hysteresis
VCC voltage
Symbol
Min
Typ
Max
Units
INUVLO_RISING
2.8
3.0
3.2
V
INUVLO_FALLING
2.45
2.65
2.85
V
INUVLO_HYS
VCC
VCC regulation
VCC current limit
VIN quiescent
current
VIN quiescent
current (switching) (7)
VIN shutdown
current
FB voltage
Condition
250
IVCC = 0A
4.6
IVCC = 30mA
ILIMIT_VCC
IQ
IQ_ACTIVE
ISHDN
VFB
VCC = 4V
5.2
V
1
4
%
mA
18
MODE = GND (AAM), switching, no load,
RFB_UP = 1MΩ, RFB_DOWN = 316kΩ
MODE = high (FCCM), switching,
fSW = 2MHz, no load
MODE = high (FCCM), switching,
fSW = 470kHz, no load
EN = 0V
FB current
IFB
Switching frequency
fSW
Minimum on time (7)
tON_MIN
(7)
Minimum off time
tOFF_MIN
SYNCIN voltage
VSYNC_RISING
rising threshold
SYNCIN voltage
VSYNC_FALLING
falling threshold
SYNCIN clock range
fSYNC
External clock
SYNCO high voltage VSYNCO_HIGH ISYNCO = -1mA
SYNCO low voltage
VSYNCO_LOW ISYNCO = 1mA
SYNCIN or FREQ sets the switching
SYNCO phase shift
frequency
HS current limit
ILIMIT
Duty cycle = 30%
LS valley current
ILIMIT_VALLEY
limit
ZCD current
IZCD
AAM
LS reverse current
ILIMIT_REVERSE FCCM
limit
4.9
100
FB = 0.85V, no load (sleep mode)
VIN = 3.3V to 45V, TJ = 25°C
VIN = 3.3V to 45V
VFB = 0.85V
RFREQ = 62kΩ
mV
μA
40
mA
9.5
mA
2.5
0.815 0.823
0.815 0.831
0
+50
470
520
100
80
1.8
350
3.3
μA
20
1.7
0.807
0.799
-50
420
26
μA
V
V
nA
kHz
ns
ns
V
0.4
V
530
kHz
V
V
4.5
0.4
180
deg
10
13
16
A
8
10
12
A
-0.15
0.1
+0.35
A
2
4.5
6.5
A
MP4436/MP4436A Rev. 1.0
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8/24/2020
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MP4436/MP4436A – 5V, 6A, LOW IQ, SYNCHRONOUS STEP-DOWN CONVERTER
ELECTRICAL CHARACTERISTICS (continued)
VIN = 12V, VEN = 2V, TJ = -40°C to +125°C (6), typical values are at TJ = 25°C, unless otherwise noted.
Parameter
Symbol
Switch leakage current
HS switch on
resistance
LS switch on
resistance
Soft-start current
Condition
Min
ISW_LKG
Typ
Max
Units
0.01
1
µA
RON_HS
VBST - VSW = 5V
48
80
mΩ
RON_LS
VCC = 5V
20
40
mΩ
ISS
VSS = 0V
4
6
8
µA
EN rising threshold
VEN_RISING
0.8
1
1.2
V
EN falling threshold
VEN_FALLING
0.65
0.85
1.05
V
EN hysteresis voltage
VEN_HYS
MODE rising threshold
VMODE_RISING
MODE falling threshold
VMODE_FALLING
PG rising threshold
(VFB / VREF)
PGRISING
PG falling threshold
(VFB / VREF)
PGFALLING
PG output voltage low
PG rising delay
PG falling delay
Thermal shutdown
Thermal shutdown
hysteresis (7)
(7)
VPG_LOW
180
mV
1.8
VFB rising
VFB falling
VFB falling
VFB rising
ISINK = 1mA
88.5%
101.5%
86.5%
103%
V
0.4
V
93%
106%
91%
107.5%
97.5%
110.5%
95.5%
112%
VREF
0.1
0.3
V
tPG_R_DELAY
30
µs
tPG_F_DELAY
30
µs
tSD
170
C
tSD_HYS
20
°C
Notes:
6) Guaranteed by over-temperature correlation. Not tested in production.
7) Derived from bench characterization. Not tested in production.
MP4436/MP4436A Rev. 1.0
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8/24/2020
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MP4436/MP4436A – 5V, 6A, LOW IQ, SYNCHRONOUS STEP-DOWN CONVERTER
TYPICAL CHARACTERISTICS
VIN = 12V, TJ = -40°C to +125°C, unless otherwise noted.
IQ vs. Temperature
VFB vs. Temperature
23
0.818
22
0.817
21
0.816
VFB (V)
IQ (μA)
20
0.815
19
18
0.814
17
0.813
16
0.812
15
-50
-25
0
25
50
75
100
-50
125
-25
TEMPERATURE (°C)
ILIMIT vs. Temperature
14.5
ILIMIT_VALLEY (A)
ILIMIT (A)
14.0
13.5
13.0
12.5
12.0
11.5
11.0
-25
0
25
50
125
75
100
11.0
10.8
10.6
10.4
10.2
10.0
9.8
9.6
9.4
9.2
9.0
-50
125
-25
TEMPERATURE (°C)
Reverse Current Limit vs.
Temperature
0
25
50
75
TEMPERATURE (°C)
100
125
VIN UVLO Threshold vs. Temperature
5.0
4.8
4.6
4.4
4.2
4.0
3.8
3.6
3.4
3.2
3.0
3.1
VIN UVLO THRESHOLD (V)
ILIMIT_REVERSE (A)
100
Valley Current Limit vs. Temperature
15.0
-50
0
25
50
75
TEMPERATURE (°C)
-50
-25
0
25
50
75
TEMPERATURE (°C)
100
125
3.0
2.9
2.8
VIN UVLO Rising
VIN UVLO Falling
2.7
2.6
-50
-25
0
25
50
75
TEMPERATURE (°C)
MP4436/MP4436A Rev. 1.0
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125
8
MP4436/MP4436A – 5V, 6A, LOW IQ, SYNCHRONOUS STEP-DOWN CONVERTER
TYPICAL CHARACTERISTICS (continued)
VIN = 12V, TJ = -40°C to +125°C, unless otherwise noted.
PG Rising/Falling Threshold vs.
Temperature
EN UVLO Threshold vs. Temperature
110
PG THRESHOLD (% of VREF)
EN UVLO THRESHOLD (V)
1.05
1.00
0.95
EN UVLO Rising
EN UVLO Falling
0.90
0.85
0.80
-50
-25
0
25
50
75
TEMPERATURE (°C)
100
105
PG Upper Rising Threshold
95
90
85
125
-50
-25
0
25
50
75
TEMPERATURE (°C)
100
125
RHS_ON vs. Temperature
2.2
70
2.1
65
2.0
60
RHS_ON (mΩ)
ISHDN (μA)
VIN Shutdown Current vs.
Temperature
1.9
1.8
1.7
55
50
45
1.6
40
1.5
35
1.4
-50
-25
0
25
50
75
TEMPERATURE (°C)
100
-50
125
RLS_ON vs. Temperature
-25
0
25
50
75
TEMPERATURE (°C)
100
125
VCC vs. Temperature
30
4.96
28
4.95
4.94
26
4.93
VCC (V)
RLS_ON (mΩ)
PG Lower Rising Threshold
PG Lower Falling Threshold
PG Upper Falling Threshold
100
24
22
4.92
4.91
4.90
20
4.89
18
4.88
16
4.87
-50
-25
0
25
50
75
TEMPERATURE (°C)
100
125
-50
-25
0
25
50
75
TEMPERATURE (°C)
MP4436/MP4436A Rev. 1.0
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125
9
MP4436/MP4436A – 5V, 6A, LOW IQ, SYNCHRONOUS STEP-DOWN CONVERTER
TYPICAL CHARACTERISTICS (continued)
VIN = 12V, TJ = -40°C to +125°C, unless otherwise noted.
Soft-Start Current vs. Temperature
ZCD vs. Temperature
150
6.8
6.6
130
6.4
ZCD (mA)
ISS (μA)
6.2
6.0
5.8
110
90
5.6
70
5.4
5.2
50
5.0
-50
-25
0
25
50
75
TEMPERATURE (°C)
100
125
100
125
-50
-25
0
25
50
75
TEMPERATURE (°C)
100
125
fSW vs. Temperature
RFREQ = 62kΩ
473
472
fSW (kHz)
471
470
469
468
467
466
465
-50
-25
0
25
50
75
TEMPERATURE (°C)
MP4436/MP4436A Rev. 1.0
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MP4436/MP4436A – 5V, 6A, LOW IQ, SYNCHRONOUS STEP-DOWN CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS
Efficiency vs. Load Current
Efficiency vs. Load Current
AAM, L = 3.3μH
FCCM, L = 3.3μH
100
90
80
70
60
50
40
30
20
10
0
EFFICIENCY (%)
EFFICIENCY (%)
VIN = 12V, VOUT = 3.3V, L = 4.7μH, fSW = 470kHz, AAM, TA = 25°C, unless otherwise noted.
VIN=12V
VIN=24V
VIN=36V
VIN=45V
0.1
1
10
100
1000
6000
100
90
80
70
60
50
40
30
20
10
0
0.1
LOAD CURRENT (mA)
Efficiency vs. Load Current
90
90
80
80
EFFICIENCY (%)
EFFICIENCY (%)
100
70
60
50
VIN=12V
VIN=24V
VIN=36V
VIN=45V
20
10
6000
VIN=12V
VIN=24V
VIN=36V
VIN=45V
70
60
50
40
30
20
10
0
0
0.1
1
10
100
1000 6000
0.1
1
LOAD CURRENT (mA)
10
100
1000
6000
LOAD CURRENT (mA)
Efficiency vs. Load Current
Efficiency vs. Load Current
Extremely light load, AAM, L = 3.3μH
Extremely light load, FCCM, L = 3.3μH
50
0.30
EFFICIENCY (%)
VIN=12V
VIN=24V
VIN=36V
VIN=45V
40
EFFICIENCY (%)
10
100
1000
LOAD CURRENT (mA)
FCCM, VOUT = 5V, L = 3.3μH
100
30
1
Efficiency vs. Load Current
AAM, VOUT = 5V, L = 3.3μH
40
VIN=12V
VIN=24V
VIN=36V
VIN=45V
30
20
Vin=12V
Vin=24V
Vin=36V
Vin=45V
0.20
0.10
10
0.00
0
0.01
0.025
0.04
0.055
0.07
0.085
LOAD CURRENT (mA)
0.1
0.01
0.025
0.04 0.055 0.07 0.085
LOAD CURRENT (mA)
MP4436/MP4436A Rev. 1.0
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0.1
11
MP4436/MP4436A – 5V, 6A, LOW IQ, SYNCHRONOUS STEP-DOWN CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 12V, VOUT = 3.3V, L = 4.7μH, fSW = 470kHz, AAM, TA = 25°C, unless otherwise noted.
Efficiency vs. Load Current
Efficiency vs. Load Current
Extremely light load, AAM, VOUT = 5V, L = 3.3μH
Extremely light load, FCCM, VOUT = 5V, L = 3.3μH
0.30
50
EFFICIENCY (%)
40
30
EFFICIENCY (%)
VIN=12V
VIN=24V
VIN=36V
VIN=45V
20
VIN=12V
VIN=24V
VIN=36V
VIN=45V
0.20
0.10
10
0
0.00
0.01
0.025
0.04
0.055
0.07
0.085
0.1
0.01
0.025
LOAD CURRENT (mA)
0.07
0.085
0.1
Load Regulation
AAM
FCCM
0.08
0.010
VIN=12V
VIN=24V
VIN=36V
VIN=45V
0.06
0.04
0.02
0.00
LOAD REGULATION (%)
LOAD REGULATION (%)
0.055
LOAD CURRENT (mA)
Load Regulation
-0.02
0.005
0.000
-0.005
VIN=12V
VIN=24V
VIN=36V
VIN=45V
-0.010
-0.015
-0.020
10
100
1000
6000
10
LOAD CURRENT (mA)
100
1000
6000
LOAD CURRENT (mA)
Load Regulation
Load Regulation
AAM, VOUT = 5V
FCCM, VOUT = 5V
0.10
0.010
VIN=12V
VIN=24V
VIN=36V
VIN=45V
0.08
0.06
0.04
0.02
0.00
-0.02
LOAD REGULATION (%)
LOAD REGULATION (%)
0.04
0.005
0.000
-0.005
-0.010
-0.015
VIN=12V
VIN=24V
VIN=36V
VIN=45V
-0.020
-0.025
-0.030
-0.04
10
100
1000
LOAD CURRENT (mA)
6000
10
100
1000
6000
LOAD CURRENT (mA)
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MP4436/MP4436A – 5V, 6A, LOW IQ, SYNCHRONOUS STEP-DOWN CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 12V, VOUT = 3.3V, L = 4.7μH, fSW = 470kHz, AAM, TA = 25°C, unless otherwise noted.
Line Regulation
Line Regulation
AAM
FCCM
0.01
LINE REGULATION (%)
LINE REGULATION (%)
0.01
0.00
-0.01
-0.02
IOUT=10mA
IOUT=3A
IOUT=6A
-0.03
-0.04
0.00
-0.01
-0.02
IOUT=10mA
IOUT=3A
IOUT=6A
-0.03
-0.04
5
10
15
20
25
30
35
40
5
45
10
15
20
Line Regulation
35
40
45
FCCM, VOUT = 5V
0.04
0.02
IOUT=10mA
IOUT=3A
IOUT=6A
0.03
0.02
LINE REGULATION (%)
LINE REGULATION (%)
30
Line Regulation
AAM, VOUT = 5V
0.01
0.00
-0.01
-0.02
-0.03
-0.04
IOUT=10mA
IOUT=3A
IOUT=6A
0.01
0.00
-0.01
-0.02
-0.03
-0.04
5
10
15
20
25
30
35
40
45
5
10
15
20
VIN (V)
25
Case Thermal Rise
Case Thermal Rise
VOUT = 3.3V
VOUT = 5V
CASE THERMAL RISE ( C)
45
40
35
30
25
20
15
10
5
0
0
1
2
3
30
35
40
45
VIN (V)
50
CASE THERMAL RISE (°C)
25
VIN (V)
VIN (V)
4
LOAD CURRENT (A)
5
6
50
45
40
35
30
25
20
15
10
5
0
0
1
2
3
4
5
6
LOAD CURRENT (A)
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MP4436/MP4436A – 5V, 6A, LOW IQ, SYNCHRONOUS STEP-DOWN CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 12V, VOUT = 3.3V, L = 4.7μH, fSW = 470kHz, AAM, TA = 25°C, unless otherwise noted.
2200
2000
1800
1600
1400
1200
1000
800
600
400
200
fSW vs. RFREQ
Rfreq=62k
Rfreq=12k
6 9 12 15 18 21 24 27 30 33 36 39 42 45
VIN (V)
fSW (kHz)
fSW (kHz)
fSW vs. VIN
2200
2000
1800
1600
1400
1200
1000
800
600
400
200
10
20
30
40
50 60 70
RFREQ (kΩ)
80
90 100
Low-Dropout Mode
VOUT = 5V
5.2
4.9
VOUT (V)
4.6
4.3
IOUT=0A
4.0
IOUT=1A
3.7
IOUT=2A
3.4
3.1
2.8
IOUT=3A
IOUT=4A
IOUT=5A
IOUT=6A
2.5
3.3 3.6 3.9 4.2 4.5 4.8 5.1 5.4 5.7 6.0
VIN (V)
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MP4436/MP4436A – 5V, 6A, LOW IQ, SYNCHRONOUS STEP-DOWN CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 12V, VOUT = 5V, IOUT = 6A, L = 4.7μH, fSW = 410kHz, TA = 25°C, with FSS (MP4436A only), unless
otherwise noted. (8)
CISPR25 Class 5 Peak Conducted
Emissions
CISPR25 Class 5 Average Conducted
Emissions
150kHz to 108MHz
AVG CONDUCTED EMI (dBµV)
PEAK CONDUCTED EMI (dBµV)
150kHz to 108MHz
75
70
65
60
55
50
45
40
35
30
25
20
15
10
5
0
-5
-10
-15
-20
CISPR25 CLASS 5 PK LIMITS
PK NOISE FLOOR
1
0.1
Frequency (MHz)
75
70
65
60
55
50
45
40
35
30
25
20
15
10
5
0
-5
-10
-15
-20
108
10
0.1
CISPR25 Class 5 Peak Radiated
Emissions
PEAK RADIATED EMI (dBµV)
AVG RADIATED EMI (dBµV)
PK NOISE FLOOR
1
Frequency (MHz)
30
10
60
55
50
45
40
35
30
25
20
15
10
5
0
-5
-10
5
AVG NOISE FLOOR
1
Frequency (MHz)
30
10
30MHz to 1GHz
55
AVG RADIATED EMI (dBµV)
PEAK RADIATED EMI (dBµV)
45
40
35
30
25
20
15
10
108
10
CISPR25 Class 5 Average Radiated
Horizontal
30MHz to 1GHz
50
Frequency (MHz)
CISPR25 CLASS 5 AVG LIMITS
0.1
CISPR25 Class 5 Peak Radiated
Horizontal
55
1
150kHz to 30MHz
CISPR25 CLASS 5 PK LIMITS
0.1
AVG NOISE FLOOR
CISPR25 Class 5 Average Radiated
Emissions
150kHz to 30MHz
60
55
50
45
40
35
30
25
20
15
10
5
0
-5
-10
CISPR25 CLASS 5 AVG LIMITS
HORIZONTAL POLARIZATION
CISPR25 CLASS 5 PK LIMITS
PK NOISE FLOOR
0
-5
30
130
230
330
430
530
630
Frequency (MHz)
730
830
930 1000
50
45
40
35
30
25
20
15
10
5
0
-5
HORIZONTAL POLARIZATION
CISPR25 CLASS 5 AVG LIMITS
AVG NOISE FLOOR
30
130
230
330
430
530
630
Frequency (MHz)
730
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830
930 1000
15
MP4436/MP4436A – 5V, 6A, LOW IQ, SYNCHRONOUS STEP-DOWN CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 12V, VOUT = 5V, IOUT = 6A, L = 4.7μH, fSW = 410kHz, TA = 25°C, with FSS (MP4436A only), unless
otherwise noted. (8)
CISPR25 Class 5 Peak Radiated
Emissions
CISPR25 Class 5 Average Radiated
Emissions
Vertical, 30MHz to 1GHz
VERTICAL POLARIZATION
AVG RADIATED EMI (dBµV)
PEAK RADIATED EMI (dBµV)
Vertical, 30MHz to 1GHz
55
50
45
40
35
30
25
20
15
10
5
0
-5
CISPR25 CLASS 5 PK LIMITS
PK NOISE FLOOR
30
130
230
330
430
530
630
Frequency (MHz)
730
830
930 1000
55
50
45
40
35
30
25
20
15
10
5
0
-5
VERTICAL POLARIZATION
CISPR25 CLASS 5 AVG LIMITS
AVG NOISE FLOOR
30
130
230
330
430
530
630
Frequency (MHz)
730
830
930 1000
Note:
8) The EMC test results are based on the application circuit with EMI filters (see Figure 13 on page 34).
MP4436/MP4436A Rev. 1.0
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MP4436/MP4436A – 5V, 6A, LOW IQ, SYNCHRONOUS STEP-DOWN CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 12V, VOUT = 3.3V, L = 4.7μH, fSW = 470kHz, AAM, TA = 25°C, unless otherwise noted.
Steady State
Steady State
IOUT = 0A, AAM
IOUT = 0A, FCCM
CH2:
VOUT/AC
50mV/div.
CH2:
VOUT/AC
10mV/div.
CH4: IL
1A/div.
CH4: IL
1A/div.
CH1: VSW
5V/div.
CH1: VSW
5V/div.
40ms/div.
1μs/div.
Steady State
Start-Up through VIN
IOUT = 6A
IOUT = 0A, AAM
CH2:
VOUT/AC
10mV/div.
CH3: VIN
5V/div.
CH4: IL
2A/div.
CH2: VOUT
1V/div.
CH1: VSW
5V/div.
CH4: IL
1A/div.
CH1: VSW
10V/div.
1μs/div.
1ms/div.
Start-Up through VIN
Start-Up through VIN
IOUT = 0A, FCCM
IOUT = 6A
CH3: VIN
5V/div.
CH3: VIN
5V/div.
CH2: VOUT
1V/div.
CH2: VOUT
1V/div.
CH4: IL
2A/div.
CH1: VSW
10V/div.
CH4: IL
5A/div.
CH1: VSW
10V/div.
1ms/div.
1ms/div.
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MP4436/MP4436A – 5V, 6A, LOW IQ, SYNCHRONOUS STEP-DOWN CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 12V, VOUT = 3.3V, L = 4.7μH, fSW = 470kHz, AAM, TA = 25°C, unless otherwise noted.
Shutdown through VIN
Shutdown through VIN
IOUT = 0A, AAM
IOUT = 0A, FCCM
CH3: VIN
5V/div.
CH3: VIN
5V/div.
CH2: VOUT
1V/div.
CH2: VOUT
1V/div.
CH4: IL
1A/div.
CH4: IL
2A/div.
CH1: VSW
5V/div.
CH1: VSW
10V/div.
10ms/div.
10ms/div.
Shutdown through VIN
Start-Up through EN
IOUT = 6A
IOUT = 0A, AAM
CH3: VIN
5V/div.
CH3: VEN
2V/div.
CH2: VOUT
1V/div.
CH2: VOUT
1V/div.
CH4: IL
5A/div.
CH4: IL
2A/div.
CH1: VSW
10V/div.
CH1: VSW
10V/div.
400µs/div.
1ms/div.
Start-Up through EN
Start-Up through EN
IOUT = 0A, FCCM
IOUT = 6A
CH3: VEN
2V/div.
CH3: VEN
2V/div.
CH2: VOUT
1V/div.
CH2: VOUT
1V/div.
CH4: IL
2A/div.
CH1: VSW
10V/div.
CH4: IL
5A/div.
CH1: VSW
10V/div.
1ms/div.
1ms/div.
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MP4436/MP4436A – 5V, 6A, LOW IQ, SYNCHRONOUS STEP-DOWN CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 12V, VOUT = 3.3V, L = 4.7μH, fSW = 470kHz, AAM, TA = 25°C, unless otherwise noted.
Shutdown through EN
Shutdown through EN
IOUT = 0A, AAM
IOUT = 0A, FCCM
CH3: VEN
2V/div.
CH3: VEN
2V/div.
CH2: VOUT
1V/div.
CH2: VOUT
1V/div.
CH4: IL
1A/div.
CH1: VSW
5V/div.
CH4: IL
1A/div.
CH1: VSW
10V/div.
100ms/div.
100ms/div.
Shutdown through EN
SCP Entry
IOUT = 6A
IOUT = 0A, AAM
CH3: VEN
2V/div.
CH2: VOUT
2V/div.
CH2: VOUT
1V/div.
CH3: VPG
5V/div.
CH4: IL
5A/div.
CH1: VSW
10V/div.
CH4: IL
10A/div.
CH1: VSW
10V/div.
100µs/div.
20ms/div.
SCP Entry
SCP Entry
IOUT = 0A, FCCM
IOUT = 6A
CH2: VOUT
2V/div.
CH2: VOUT
2V/div.
CH3: VPG
5V/div.
CH3: VPG
5V/div.
CH4: IL
10A/div.
CH1: VSW
10V/div.
CH4: IL
10A/div.
CH1: VSW
10V/div.
20ms/div.
20ms/div.
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MP4436/MP4436A – 5V, 6A, LOW IQ, SYNCHRONOUS STEP-DOWN CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 12V, VOUT = 3.3V, L = 4.7μH, fSW = 470kHz, AAM, TA = 25°C, unless otherwise noted.
SCP Recovery
SCP Recovery
IOUT = 0A, AAM
IOUT = 0A, FCCM
CH2: VOUT
2V/div.
CH2: VOUT
2V/div.
CH3: VPG
5V/div.
CH3: VPG
5V/div.
CH4: IL
10A/div.
CH1: VSW
10V/div.
CH4: IL
10A/div.
CH1: VSW
10V/div.
10ms/div.
10ms/div.
SCP Recovery
SCP Steady State
IOUT = 6A
CH2: VOUT
1V/div.
CH2: VOUT
2V/div.
CH3: VPG
5V/div.
CH4: IL
5A/div.
CH4: IL
10A/div.
CH1: VSW
10V/div.
CH1: VSW
10V/div.
10ms/div.
4ms/div.
Load Transient
SYNC Operation
IOUT = 3A to 6A, 1.6A/μs
IOUT = 6A, SYNC frequency = 350kHz
CH2:
VOUT/AC
200mV/div.
CH3:
SYNCIN
2V/div.
CH2: VOUT
2V/div.
CH4: IL
2A/div.
CH4: IL
2A/div.
CH1: VSW
10V/div.
CH1: VSW
10V/div.
100µs/div.
2µs/div.
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MP4436/MP4436A – 5V, 6A, LOW IQ, SYNCHRONOUS STEP-DOWN CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 12V, VOUT = 3.3V, L = 4.7μH, fSW = 470kHz, AAM, TA = 25°C, unless otherwise noted.
SYNC Operation
SYNCO Operation
IOUT = 6A, SYNC frequency = 530kHz
IOUT = 6A, SYNC frequency = 350kHz
CH3:
SYNCIN
2V/div.
CH3:
SYNCO
2V/div.
CH2: VOUT
1V/div.
CH2: VOUT
2V/div.
CH4: IL
2A/div.
CH4: IL
2A/div.
CH1: VSW
5V/div.
CH1: VSW
10V/div.
1µs/div.
2µs/div.
SYNCO Operation
PG Start-Up through VIN
IOUT = 6A, SYNC frequency = 530kHz
IOUT = 0A
CH3: VIN
5V/div.
CH3:
SYNCO
2V/div.
CH2: VOUT
2V/div.
CH2: VOUT
1V/div.
CH4: IL
2A/div.
CH4: VPG
2V/div.
CH1: VSW
10V/div.
CH1: VSW
2V/div.
1µs/div.
1ms/div.
PG Start-Up through VIN
PG Shutdown through VIN
IOUT = 6A
IOUT = 0A
CH3: VIN
5V/div.
CH3: VIN
5V/div.
CH2: VOUT
2V/div.
CH2: VOUT
2V/div.
CH4: VPG
2V/div.
CH4: VPG
2V/div.
CH1: VSW
5V/div.
CH1: VSW
5V/div.
1ms/div.
20ms/div.
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MP4436/MP4436A – 5V, 6A, LOW IQ, SYNCHRONOUS STEP-DOWN CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 12V, VOUT = 3.3V, L = 4.7μH, fSW = 470kHz, AAM, TA = 25°C, unless otherwise noted.
PG Shutdown through VIN
PG Start-Up through EN
IOUT = 6A
IOUT = 0A
CH3: VIN
5V/div.
CH3: VEN
2V/div.
CH2: VOUT
2V/div.
CH2: VOUT
2V/div.
CH4: VPG
2V/div.
CH4: VPG
2V/div.
CH1: VSW
5V/div.
CH1: VSW
5V/div.
20ms/div.
1ms/div.
PG Start-Up through EN
PG Shutdown through EN
IOUT = 6A
IOUT = 0A
CH3: VEN
2V/div.
CH3: VEN
2V/div.
CH2: VOUT
2V/div.
CH2: VOUT
2V/div.
CH4: VPG
2V/div.
CH4: VPG
2V/div.
CH1: VSW
10V/div.
CH1: VSW
5V/div.
1ms/div.
100ms/div.
PG Shutdown through EN
Low-Dropout Mode
IOUT = 6A
VIN = 3.3V, VOUT set to 3.3V, IOUT = 0A
CH3: VEN
2V/div.
CH3: VIN
500mV/div.
CH2: VOUT
500mV/div.
CH2: VOUT
2V/div.
CH4: IL
50mA/div.
CH4: VPG
2V/div.
CH1: VSW
1V/div.
CH1: VSW
10V/div.
1ms/div.
4µs/div.
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MP4436/MP4436A – 5V, 6A, LOW IQ, SYNCHRONOUS STEP-DOWN CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 12V, VOUT = 3.3V, L = 4.7μH, fSW = 470kHz, AAM, TA = 25°C, unless otherwise noted.
Low-Dropout Mode
Load Dump
VIN = 3.3V, VOUT set to 3.3V, IOUT = 6A
VIN = 12V to 36V, IOUT = 6A
CH3: VIN
500mV/div.
CH2: VOUT
500mV/div.
CH3: VIN
10V/div.
CH4: IL
2A/div.
CH2: VOUT
2V/div.
CH4: IL
5A/div.
CH1: VSW
1V/div.
CH1: VSW
50V/div.
4µs/div.
100ms/div.
Cold Crank
VIN Ramp Up and Down
VIN = 12V to 3.3V to 5V, IOUT = 6A
IOUT = 0.1A
CH3: VIN
5V/div.
CH2: VOUT
1V/div.
CH4: IL
2A/div.
CH3: VIN
1V/div.
CH2: VOUT
1V/div.
CH1: VSW
5V/div.
4ms/div.
1s/div.
VIN Ramp Down and Up
VIN Ramp Down and Up
IOUT = 1mA
IOUT = 6A
CH3: VIN
10V/div.
CH3: VIN
10V/div.
4.5V
4.5V
CH2: VOUT
2V/div.
CH2: VOUT
2V/div.
CH4: IL
2A/div.
CH4: IL
5A/div.
CH1: VSW
20V/div.
CH1: VSW
20V/div.
10s/div.
10s/div.
MP4436/MP4436A Rev. 1.0
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MP4436/MP4436A – 5V, 6A, LOW IQ, SYNCHRONOUS STEP-DOWN CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 12V, VOUT = 3.3V, L = 4.7μH, fSW = 470kHz, AAM, TA = 25°C, unless otherwise noted.
Steady State
Steady State
VIN = 12V, VOUT = 3.3V, IOUT = 20A, 4-phase
VIN = 12V, VOUT = 3.3V, IOUT = 20A, 4-phase
CH1: IL1
2A/div.
CH3: IL3
2A/div.
CH1: VSW1
10V/div.
CH3: VSW3
10V/div.
CH2: IL2
2A/div.
CH2: VSW2
10V/div.
CH4: IL4
2A/div.
CH4: VSW4
10V/div.
1µs/div.
1µs/div.
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MP4436/MP4436A – 5V, 6A, LOW IQ, SYNCHRONOUS STEP-DOWN CONVERTER
FUNCTION BLOCK DIAGRAM
VCC
VCC
VCC
Regulator
VREF
EN
VIN
VCC
Reference
BST
Regulator
BST
FREQ
SYNCIN
SYNCO
PG
+
-
VPG_REF
VFB
SW
Control Logic
VCC
ISS
Error Amplifier
VREF
SS
ISW
Oscillator
VFB
+
+
-
VCOMP
1.15M
60pF
2pF
ILS
Current
Sharing
PGND
FB
AGND
ICS MODE
Figure 1: Functional Block Diagram
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MP4436/MP4436A – 5V, 6A, LOW IQ, SYNCHRONOUS STEP-DOWN CONVERTER
TIMING SEQUENCE DIAGRAM
VIN
0
SW
0
EN
EN
Threshold
0
VCC
0
15µs
VCC
Threshold
93% x
VREF
91% x VREF
93% x
VREF
107.5% x VREF
106% x VREF
91% x VREF
70% x VREF
VO
SS
0
IL = ILIMIT i
IL
0
PG
30µs
30µs
30µs
30µs
30µs
30µs
0
Start-Up
Normal
Normal
OCP
OV
Normal
Shutdown
OC
Release
Figure 2: Timing Sequence Diagram
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MP4436/MP4436A – 5V, 6A, LOW IQ, SYNCHRONOUS STEP-DOWN CONVERTER
OPERATION
The MP4436/MP4436A is a synchronous, stepdown switching regulator with integrated internal
high-side and low-side power MOSFETs. It
provides 6A of highly efficient output with current
mode control.
The device features a wide input voltage range,
configurable switching frequency, external soft
start, and precision current limiting. Its low
operational quiescent current makes it ideal for
battery-powered applications.
PWM Control
At moderate to high output currents, the
MP4436/MP4436A operates in fixed-frequency,
peak current control mode to regulate the output
voltage. A PWM cycle is initiated by the internal
clock. At the rising edge of the clock, the highside MOSFET (HS-FET) turns on and remains
on until its current reaches the value set by the
internal COMP voltage (VCOMP). Once the HSFET is on, it remains on for at least 100ns.
When the high-side power switch is off, the lowside MOSFET (LS-FET) turns on immediately
and remains on until the next cycle starts. Once
the LS-FET is on, it remains on for at least 80ns
before the next cycle starts.
If the current in the HS-FET does not reach the
value set by COMP within one PWM period, the
HS-FET remains on, saving a turn-off operation.
The HS-FET is forced off if the on time lasts
about 10µs, even if the current value is not
reached.
Light-Load Operation
Under
light-load
conditions,
the
MP4436/MP4436A can work in two different
operation modes based on the status of the
MODE pin.
The MP4436/MP4436A works in forced
continuous conduction mode (FCCM) when the
MODE pin is pulled above 1.8V. The part works
with fixed frequency from no load to full load in
this mode. The advantage of FCCM is the
controllable frequency and lower output ripple at
light load.
The MP4436/MP4436A works in advanced
asynchronous mode (AAM) when the MODE pin
is pulled below 0.4V. AAM optimizes efficiency
under light-load and no-load conditions.
When AAM is enabled, the MP4436/MP4436A
first enters asynchronous operation while the
inductor current approaches 0A at light load. If
the load is further decreased, or there is no load
and VCOMP drops to the set value, then the
MP4436/MP4436A enters AAM. In AAM, the
internal clock is reset every time VCOMP crosses
over the set value. The crossover time is used as
the benchmark for the next clock. When the load
increases and VCOMP exceeds the set value, the
operation mode is DCM or CCM, which has a
constant switching frequency (see Figure 3).
Inductor
Current
Load
Decreased
Inductor
Current
AAM
FCCM
t
t
Load
t Decreased
t
t
t
Figure 3: AAM and FCCM
Error Amplifier
The error amplifier compares the FB pin voltage
(VFB) with the internal reference (0.815V) and
outputs a current proportional to the difference
between the two values. This output current is
then used to charge the compensation network
to form VCOMP, which controls the power
MOSFET current. During operation, the
minimum VCOMP is clamped to 0.9V, and the
maximum is clamped to 2.0V. COMP is internally
pulled down to GND in shutdown mode.
Internal Regulator (VCC)
Most of the internal circuitry is powered by the
internal 4.9V VCC regulator. This regulator takes
VIN as the input and operates in the full VIN range.
If VIN exceeds 4.9V, VCC is in full regulation.
When VIN is below this point, the output VCC
degrades.
Bootstrap Charging
The bootstrap capacitor is charged and
regulated to about 5V by the dedicated internal
bootstrap regulator. If the voltage between the
BST and SW nodes is below its regulation, a
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MP4436/MP4436A – 5V, 6A, LOW IQ, SYNCHRONOUS STEP-DOWN CONVERTER
PMOS pass transistor connected from VCC to
BST turns on to charge the bootstrap capacitor.
External circuitry should provide sufficient
headroom voltage to facilitate the charging.
If the HS-FET is on, BST is above VCC, and the
bootstrap capacitor cannot be charged.
Under operation conditions with higher duty
cycles, there is less time to charge the bootstrap,
so the bootstrap capacitor may not charge
sufficiently. If the external circuit does not have a
sufficient voltage or enough time to charge the
bootstrap capacitor, extra external circuitry can
be used to ensure that the bootstrap voltage is in
the normal operation range.
Low-Dropout Operation and BST Refresh
To improve dropout, the MP4436/MP4436A is
designed to operate at close to 100% duty cycle
as long as the BST-to-SW voltage exceeds 2.5V.
When the voltage from BST to SW drops below
2.5V, the HS-FET turns off using an undervoltage lockout (UVLO) circuit, which allows the
LS-FET to conduct and refresh the charge on the
BST capacitor. In DCM mode or PSM mode, the
LS-FET is forced on to refresh the BST voltage.
Since the supply current sourced from the BST
capacitor is low, the HS-FET remains on for
more switching cycles than are required to
refresh the capacitor. Therefore, the effective
duty cycle of the switching regulator is high.
The effective duty cycle during regulator dropout
is mainly influenced by the voltage drops across
the power MOSFET, inductor resistance, lowside diode, and PCB resistance.
Enable Control
EN is a digital control pin that turns the regulator
on and off (see Figure 4). It offers two main
features:
1. Enabled by external logic H/L signal: If EN is
pulled below the falling voltage threshold
(0.85V), the chip goes into the lowest
shutdown current mode. Force the EN pin
above the EN rising threshold voltage (1V) to
turn the part on.
2. Configurable VIN under-voltage lockout
(UVLO): With a sufficient VIN, the chip can be
enabled and disabled by the EN pin. With the
internal current source, this circuit can
generate a configurable VIN UVLO threshold
and hysteresis.
VIN
REN1
EN
REN2
Figure 4: Enable Divider Circuit
Configurable Frequency and Frequency
Foldback
The MP4436/MP4436A oscillating frequency is
configured either by an external resistor (RFREQ)
from the FREQ pin to ground, or by a logic level
SYNC signal.
For an expected switching frequency (fSW), select
the RFREQ value following the fSW vs. RFREQ curve
in the Typical Performance Characteristics
section on page 14. Note that if fSW is set to a
high value, it will fold back at high a VIN to avoid
triggering the minimum on time and forcing the
output out of regulation.
The fSW vs. VIN curve in the Typical Performance
Characteristics section on page 14 shows an
example
when
RFREQ
is
12kΩ.
The
corresponding fSW is about 2.1MHz when
VIN = 12V, and drops below 1.5MHz when VIN
exceeds 18V. This means the switching
frequency drops into the AM band ( VSS - 150mV at start-up (which means
the output has a pre-biased voltage), neither the
HS-FET nor LS-FET turn on until VSS exceeds
VFB.
Thermal Shutdown
Thermal shutdown is implemented to prevent the
chip from thermal runaway. If the silicon die
temperature exceeds its upper threshold, it shuts
down the power MOSFETs. If the temperature
falls below its lower threshold, the chip is
enabled again.
Current Comparator and Current Limit
The power MOSFET current is accurately
sensed via a current-sense MOSFET. It is then
fed to the high-speed current comparator for
When the HS-FET turns on, the comparator is
blanked until the end of start-up to prevent the
noise. Then the comparator compares the power
switch current with VCOMP. If the sensed current
exceeds VCOMP, the comparator outputs low to
turn off the HS-FET. The maximum current of the
internal power MOSFET is internally limited
cycle by cycle.
Hiccup Protection
If the output is shorted to ground and the output
voltage drops below 70% of its nominal output,
the IC shuts down momentarily and begins
discharging the soft-start capacitor. It restarts
with a full soft start when the soft-start capacitor
is fully discharged. This hiccup process repeats
until the fault is removed.
Start-Up and Shutdown
If both VIN and EN exceed their respective
thresholds, the chip starts. The reference block
starts first, generating a stable reference voltage
and current. Then the internal regulator is
enabled; the regulator provides a stable supply
for the remaining circuitries.
While the internal supply rail is up, an internal
timer holds the power MOSFET off for about
50µs to blank the start-up glitches. When the
soft-start block is enabled, it first holds its SS
output low to ensure the remaining circuitries are
ready, then slowly ramps up.
Three events shut down the chip: EN going low,
VIN going low, and thermal shutdown. During
shutdown, the signaling path is blocked first to
avoid any fault triggering. VCOMP and the internal
supply rail are then pulled down. The floating
driver is not subject to this shutdown command,
but its charging path is disabled.
Power Good (PG) Output
The MP4436/MP4436A has power good (PG)
indication. The PG pin is the open drain of a
MOSFET. Connect a pull-up resistor to the
power source if the PG pin is used. PG goes high
if the output voltage is within 93% to 106% of the
nominal voltage, and goes low when the output
voltage is above 107.5% or below 91% of the
nominal voltage.
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MP4436/MP4436A – 5V, 6A, LOW IQ, SYNCHRONOUS STEP-DOWN CONVERTER
SYNCIN and SYNCO
The switching frequency can be synced to the
rising edge of the clock signal applied at SYNCIN.
The recommended SYNCIN frequency range is
between 350kHz and 530kHz. Ensure that the
off time for SYNCIN is shorter than the internal
oscillator period, otherwise the internal clock
may turn on the HS-FET before the rising edge
of SYNCIN.
There is no other special limit on SYNCIN’s
pulse width, but there is always parasitic
capacitance on the pad. If the pulse width is too
short, a clear rising and falling edge may not be
seen due to the parasitic capacitance. A pulse
longer than 100ns is recommended in the
application.
When applying SYNCIN in AAM, drive SYNCIN
below its specified threshold (0.4V) or leave
SYNCIN floating before the MP4436/MP4436A
starts up and enters AAM. Then add the external
SYNCIN clock. The SYNCO pin provides a
default 180° phase-shifted clock to the internal
oscillator when there is no SYNCIN signal. If an
external clock signal is applied at SYNCIN, the
SYNCO pin provides a default 180° phaseshifted clock to the SYNCIN signal (see Figure
6).
phase-interleaved configurations (see Figure 8).
Master
VIN
VIN
EN
BST
VOUT
SW
FREQ
MP4436/ SYNCIN
MP4436A
SYNCO
FB
ICS
VCC
SS
GND
ICS
Slave
SS
BST
ICS
SW
SYNCIN
MP4436/
MP4436A
FREQ
FB
VIN
VIN
VCC
EN
GND
Figure 7: Dual-Phase Configuration
Master 1
VOUT
OUT
SYNCIN1
SYNCIN
SYNCO
SYNCO1
Slave 1
OUT
SYNCIN
Master 2
Master OSC
OUT
SYNCIN2
SYNCO2
SYNCIN
OSC half CLK
SYNCO
Master CLK
Slave 2
SYNCO
180° out of
phase to
CLK
Master SYNCO
= Slave SYNCIN
OUT
Ensure internal OSC resets before it runs
out, otherwise internal CLK comes out
Slave OSC Nominal
Trigger Point
SYNCIN
Slave OSC
OSC resets at the rising
edge of SYNCIN
Slave CLK
CLK sets at SYNCIN
rising edge
OSC sets at the
falling edge of
SYNCIN
Slave SYNCO
SYNCO reverses to
SYNCIN
SYNCIN1
D = 50%
90°
Phase
Shift
SYNCIN2
D = 50%
Figure 6: SYNCIN and SYNCO Scheme
Figure 7 shows a dual-phase, interleaved
configuration. For multi-phase applications, the
VOUT, FB, and ICS pins of parallel ICs must be
connected together. The SYNCO of the master
is connected to the SYNCIN pin of the slave for
SYNCO1
SYNCO2
Figure 8: Four-Phase Configuration
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MP4436/MP4436A – 5V, 6A, LOW IQ, SYNCHRONOUS STEP-DOWN CONVERTER
APPLICATION INFORMATION
Setting the BST Capacitor
If using the MP4436/MP4436A in FCCM only,
use a minimum 0.2µF BST capacitor. If using
AAM, the external BST capacitor should be
greater than 0.2µF. The BST capacitance can be
calculated with Equation (2) or Equation (3):
CBST F
75 COUT F 10-3
CBST F
IMIN A
(2)
80
IMIN A L H
(3)
If the calculated CBST exceeds 6.8µF, contact an
MPS FAE to verify the design.
Setting the VCC Capacitor
The VCC capacitance should be 10 times
greater than the boost capacitance (typically at
least 4.7µF). A VCC capacitance greater than
68µF is not recommended.
Setting the Output Voltage
The external resistor divider connected to FB
sets the output voltage (see Figure 9).
RFB1
FB
Since CIN absorbs the input switching current, it
requires an adequate ripple current rating. The
RMS current in the input capacitor can be
estimated with Equation (5):
ICIN ILOAD
VOUT
V
(1 OUT )
VIN
VIN
ICIN
VOUT
RFB2
(5)
Calculate RFB2 with Equation (4):
RFB1
VOUT
1
0.815V
(4)
Table 1 lists the recommended feedback resistor
values for common output voltages.
Table 1: Resistor Selection for Output Voltages
RFB1 (kΩ)
100 (1%)
100 (1%)
ILOAD
2
(6)
For simplification, choose an input capacitor with
an RMS current rating greater than half of the
maximum load current.
Figure 9: Feedback Network
VOUT (V)
3.3
5
For most applications, use a 4.7µF to 10µF
capacitor. It is strongly recommended to use
another, lower-value capacitor (e.g. 0.1µF) with
a small package size (0603) to absorb highfrequency switching noise. Place the smaller
capacitor as close to VIN and GND as possible.
The worst-case condition occurs at VIN = 2VOUT,
calculated with Equation (6):
MP4436/
4436A
RFB2
Selecting the Input Capacitor
The step-down converter has a discontinuous
input current, and requires a capacitor to supply
AC current to the converter while maintaining the
DC input voltage. For the best performance, use
low-ESR capacitors. Ceramic capacitors with
X5R or X7R dielectrics are highly recommended
because of their low ESR and small temperature
coefficients.
RFB2 (kΩ)
32.4 (1%)
19.6 (1%)
The input capacitor can be electrolytic, tantalum,
or ceramic. When using electrolytic or tantalum
capacitors, add a small, high-quality ceramic
capacitor (e.g. 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 excessive
voltage ripple at the input. The input voltage
ripple caused by the capacitance can be
estimated with Equation (7):
VIN
ILOAD
V
V
OUT (1 OUT )
fSW CIN VIN
VIN
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(7)
31
MP4436/MP4436A – 5V, 6A, LOW IQ, SYNCHRONOUS STEP-DOWN CONVERTER
Selecting the Output Capacitor
The output capacitor maintains the DC output
voltage. Use ceramic, tantalum, or low-ESR
electrolytic capacitors. For the best results, use
low-ESR capacitors to keep the output voltage
ripple low. The output voltage ripple can be
estimated with Equation (8):
VOUT
VOUT
V
1
(1 OUT ) (RESR
) (8)
fSW L
VIN
8fSW COUT
Where L is the inductor value, and RESR is the
equivalent series resistance (ESR) value of the
output capacitor.
For ceramic capacitors, the capacitance
dominates the impedance at the switching
frequency and causes the majority of the output
voltage ripple. For simplification, the output
voltage ripple can be estimated with Equation
(9):
VOUT
VOUT
V
(1 OUT ) (9)
8 fSW L COUT
VIN
2
For tantalum or electrolytic capacitors, the ESR
dominates the impedance at the switching
frequency. For simplification, the output ripple
can be estimated with Equation (10):
VOUT
V
V
OUT (1 OUT ) RESR
fSW L
VIN
The inductance value can be calculated with
Equation (11):
L
VOUT
V
(1 OUT )
fSW IL
VIN
(11)
Where ∆IL is the peak-to-peak inductor ripple
current.
Choose the inductor ripple current to be
approximately 30% of the maximum load current.
The maximum inductor peak current can be
calculated with Equation (12):
ILP ILOAD
VOUT
V
(1 OUT )
2fSW L
VIN
(12)
VIN Under-Voltage Lockout (UVLO) Setting
The MP4436/MP4436A has an internal, fixed
under-voltage lockout (UVLO) threshold. The
rising threshold is 3V, and the falling threshold is
about 2.65V. For applications that require a
higher UVLO point, place an external resistor
divider between VIN and EN to achieve a higher
equivalent UVLO threshold (see Figure 10).
VIN
VIN
R UP
EN
(10)
The characteristics of the output capacitor also
affect the stability of the regulation system. The
MP4436/MP4436A can be optimized for a wide
range of capacitance and ESR values.
Selecting the Inductor
A 1µH to 10µH inductor with a DC current rating
at least 25% higher than the maximum load
current is recommended for most applications.
For higher efficiency, choose an inductor with a
lower DC resistance.
A larger-value inductor results in less ripple
current and a lower output ripple voltage, but
also has a larger physical size, higher series
resistance, and lower saturation current. A good
rule to determine the inductor value is to allow
the inductor ripple current to be approximately
30% of the maximum load current.
RDOWN
Figure 10: Adjustable UVLO Using EN Divider
The UVLO rising and falling thresholds can be
calculated with Equation (13) and Equation (14),
respectively:
INUV RISING (1
RUP
) VEN_RISING
RDOWN
(13)
INUV FALLING (1
RUP
) VEN_FALLING
RDOWN
(14)
Where VEN_RISING is 1V, and VEN_FALLING is 0.85V.
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MP4436/MP4436A – 5V, 6A, LOW IQ, SYNCHRONOUS STEP-DOWN CONVERTER
PCB Layout Guidelines (9)
Efficient PCB layout, especially input capacitor
placement, is critical for stable operation. A 4layer layout is strongly recommended to improve
thermal performance. For the best results, refer
to Figure 11 and follow the guidelines below:
1.
Place the symmetric input capacitors as
close to VIN and GND as possible.
2.
Use a large ground plane to connect directly
to PGND.
3.
Add vias near PGND if the bottom layer is a
ground plane.
4.
Ensure that the high-current paths at GND
and VIN have short, direct, and wide traces.
5.
Place the ceramic input capacitor, as well as
the small package size (0603) input bypass
capacitor, as close to VIN and PGND as
possible to minimize high-frequency noise.
6.
Keep the connection between the input
capacitor and VIN as short and wide as
possible.
7.
Place the VCC capacitor as close to VCC
and GND as possible.
8.
Route SW and BST away from sensitive
analog areas, such as FB.
9.
Place the feedback resistors close to the
chip to ensure the trace that connects to FB
is as short as possible.
Inner Layer 1
Inner Layer 2
10. Use multiple vias to connect the power
planes to the internal layers.
Note:
9) The recommended PCB layout is based on Figure 12.
Bottom Layer
Figure 11: Recommended PCB Layout
Top Layer
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MP4436/MP4436A – 5V, 6A, LOW IQ, SYNCHRONOUS STEP-DOWN CONVERTER
6
TYPICAL APPLICATION
VIN 3.3 to 45V
3, 12 VIN
C1A C1B C1C
GND 10µF 10µF 0.1µF
C1D
0.1µF
SW
R1
100kΩ
EN
C4
0.22µF
L1
BST
U1
7, 8
MP4436/
MP4436A
9 EN
20
FREQ
3.3V/6A
19
GND
R6
32.4kΩ
SS
PG 14
C3
10nF
SYNCIN
2
PG
R7
100kΩ
SYNCIN
VCC
R2
51kΩ
16
C6
4.7µF FCCM
3
2
JP1
1
PGND
1
MODE
AAM
4, 5,
10, 11
17
13 SYNCO
AGND
ICS 15
SYNCO
C5 C2A C2B
47pF 47µF 47µF
18
FB
R3
62kΩ
SS
VOUT
4.7µH
R5
100kΩ
Figure 12: Single-Phase, VOUT = 3.3V, fSW = 470kHz
L1
BLM41PG600SN1L
CIN1 CIN2
1nF 10nF
CIN3
1nF
L2
4.7µH
CIN4
CIN5
CIN6
10nF
1µF
1µF
CIN7
10µF
U1
6
VEMI
CIN8
10µF
CIN10
0.1µF
VIN
CIN9
CIN11
0.1µF
47µF
GND
GND
C1A C1B
10µF 10µF
50V 50V
1210 1210
3, 12
C1C
0.1µF
50V
0603
C1D
0.1µF
50V
0603
C7
0.1µF
C8
VIN
MP4436/
MP4436A
100kΩ
EN
L3
SW
R1
0.1µF
C4
0.22µF
BST
VIN 3.3 to 45V
19
10V 10V
1210 1210
SS
PG
C9
C10
0.1µF 0.1µF
10nF
VOUT
1nF 10nF 1nF
GND
R6
19.6kΩ
VCC
COUT2 COUT4
14
PG
ICS
16
15
C6
4.7µF
3
SYNCO
MODE
1
2
JP1
1
PGND
13
SYNCIN
17 AGND
SYNCO
47pF
5V/6A
R7
100kΩ
2
R9
51kΩ
C2A C2B
47µF 47µF
COUT3
4, 5,
10, 11
SYNCIN
C5
18
R3
75kΩ
C3
10nF
50V
4.7µH
R5
100kΩ
FB
9 EN
20
FREQ
7, 8
COUT1
Figure 13: VOUT = 5V, fSW = 410kHz with EMI Filters
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MP4436/MP4436A – 5V, 6A, LOW IQ, SYNCHRONOUS STEP-DOWN CONVERTER
TYPICAL APPLICATION (continued)
U2
BST 6
C4 0.22µF
4.7µH
R5
100kΩ
FREQ
FB
R3
62kΩ
C2A C2B
47µF 47µF
C5
9
SS
PG
C3
10nF
PG1
2
SYNCIN
VCC
VCC
ICS
3
R13
51kΩ
2
PG 14
L6 VIN
MODE
CIN5 4.7µH
10µF
CIN1CIN2 CIN3 CIN4 CIN8 CIN9
1nF 10nF 1nF 10nF 1µF 1µF
C10
4.7µF
SYNCO
15 ICS
FB1 240nH
3.3V to 45V
FB
PG2
VCC 16
SYNCIN
13
JP1
VEMI
C4A C4B
R19
100kΩ
2
SYNCO1
C9
47pF 47µF 47µF
R18
32.4kΩ
1
PGND
ICS
15
1
4, 5,
10, 11
13 SYNCO
17 AGND
MODE
FREQ
C7
10nF
C6
4.7µF
R1
51kΩ
SYNCO1
16
4.7µH
R23
100kΩ
FB 18
19 SS
FB
VOUT
L2
7, 8
R15
62kΩ
R7
100kΩ
SYNC
SW
MP4436/
MP4436A
20
GND
14
EN
EN1
47pF
18
R6
32.4kΩ
19
0.1µF
VOUT
3
MP4436/
MP4436A
20
3.3V/6A
1
2
JP2
1
EN1
EN1
10µF 0.1µF
VOUT
L1
AGND
SW
BST 6
C8 0.22µF
VIN
C3D
PGND
EN
C3B C3C
3, 12
4, 5,
10, 11
7, 8
9
VIN
17
U1
VIN
3.3V to 45V
3, 12 VIN
C1A C1B C1C C1D
10µF 10µF 0.1µF 0.1µF
50V 50V 50V
50V
GND
ICS
EMI Filter
Figure 14: Dual-Phase, VOUT = 3.3V, fSW = 470kHz
U1
VIN1
3.3V to 45V
3, 12 VIN
C1A C1B C1C C1D
10µF 10µF 0.1µF 0.1µF
50V 50V 50V
50V
9
EN
U3
GND
FB
ICS
SW 7, 8
EN
MP4436/
MP4336A
20
PG 14
C7
10nF
4.7µH
R23
100kΩ
C9
2
6
C16 0.22µF
2
VAUX
L4
7,8
100kΩ
JB6
2
ICE7555
2 TRIG DIS 7
FB 18
19
PG 14
SYNCO1
SYNCIN2
VAUX
SY1
R48
10kΩ
3 OUT THRS 6
4 RST
CV 5
32.4kΩ
SS
C20
1pF
C17
C8A C8B
R41
FB
PG4
R42
100kΩ
SYNCIN
VCC
16
C18
4.7µF
R36
51kΩ
R47
0Ω
R40
47pF 47µF 47µF
20 FREQ
2
SYNCO2
VOUT
4.7µH
C15
10nF
C23
SYNCIN
JP2
SW
R38
62kΩ
FB
1
C10
EN
MP4436/
MP4336A
47pF 47µF 47µF
U5 NS
1 GND VCC 8
JP3
1
15 ICS
BST
VIN
C7C C7D
EN2
C4A C4B
PG2
1
1
3,12
9
3
PGND
AGND
17
MODE
1
10µF 0.1µF 0.1µF
4.7µF
SYNCO
4, 5,
10, 11
ICS
VCC 16
SYNCIN
15 ICS
13
C7B
10µF
R19
100kΩ
2
R13
51kΩ
C14
U4
VIN2
VOUT
R18
32.4kΩ
19 SS
SYNCO
ICS
FB 18
FREQ
R15
62kΩ
SYNCO
1
EMI Filter
BST 6
C8 0.22µF
L2
EN1
L6 VIN1
CIN5 4.7µH
0.1µF
9
MODE
13
SYNCO
15 ICS
C3D
13
CIN7 4.7µH
10µF L7
VIN2
3
C3B C3C
10µF 0.1µF
16
3
3
FB1 240nH
3.3V to 45V
GND
VIN
VCC
4.7µF
SYNCO2
JP1
VEMI
U2
3, 12
SYNCIN
R24
51kΩ
CIN1CIN2 CIN3 CIN4 CIN8 CIN9
1nF 10nF 1nF 10nF 1µF 1µF
VIN1
2
SYNCIN2
2
PG3
ICS
MODE
1
3
VCC
FB
R29
R30
100kΩ
1
PGND
1
4, 5,
10, 11
15 IC
S
17 AGND
13 SYNCO
PG
SS
C11
10nF
C6
4.7µF
MODE
14
2
JP4
1
16
FB
PGND
VCC
FREQ
4, 5,
10, 11
SYNCIN
C6B
47pF 47µF 47µF
PGND
2
R1
51kΩ
C13 C6A
100kΩ R28
18
32.4kΩ
19
PG1
VOUT
4.7µH
R26
62kΩ
R7
100kΩ
SYNC
L3
7, 8
MP4436/
MP4436A
20
AGND
PG
SW
17
SS
C3
10nF
14
EN
EN2
EN2
47pF
R6
32.4kΩ
19
SYNCO1
9
VOUT
AGND
FB
C2A C2B
47µF 47µF
18
R3
62kΩ
6
C12 0.22µF
17
FREQ
3.3V/6A
C5
BST
10µF 10µF 0.1µF 0.1µF
VOUT
L1
4.7µH
R5
100kΩ
MP4436/
MP4336A
20
C5A C5B C5C
3, 12
VIN
C5D
4, 5,
10, 11
7, 8
SW
EN1
EN1
VIN2
BST 6
C4 0.22µF
C19
NS
Figure 15: Four-Phase, VOUT = 3.3V, fSW = 470kHz
MP4436/MP4436A Rev. 1.0
www.MonolithicPower.com
8/24/2020
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2020 MPS. All Rights Reserved.
35
MP4436/MP4436A – 5V, 6A, LOW IQ, SYNCHRONOUS STEP-DOWN CONVERTER
PACKAGE INFORMATION
20-Pin FCQFN (4X4mm)
QFN-20 (4mmx4mm)
PIN 1 ID
PIN 1 ID
MARKING
PIN 1 ID
INDEX AREA
0.10x45°
TOP VIEW
BOTTOM VIEW
SIDE VIEW
NOTE:
1) ALL DIMENSIONS ARE IN MILLIMETERS.
2) LEAD COPLANARITY SHALL BE 0.80
MILLIMETERS MAX.
3) JEDEC REFERENCE IS MO-220.
4) DRAWING IS NOT TO SCALE.
RECOMMENDED LAND PATTERN
MP4436/MP4436A Rev. 1.0
www.MonolithicPower.com
8/24/2020
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2020 MPS. All Rights Reserved.
36
MP4436/MP4436A – 5V, 6A, LOW IQ, SYNCHRONOUS STEP-DOWN CONVERTER
CARRIER INFORMATION
Part Number
MP4436GR–Z
MP4436AGR–Z
Package
Description
QFN-20
(4mmx4mm)
Quantity/
Reel
Quantity/
Tube
Reel
Diameter
Carrier Tape
Width
Carrier
Tape Pitch
5000
N/A
13in
12mm
8mm
MP4436/MP4436A Rev. 1.0
www.MonolithicPower.com
8/24/2020
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2020 MPS. All Rights Reserved.
37
MP4436/MP4436A – 5V, 6A, LOW IQ, SYNCHRONOUS STEP-DOWN CONVERTER
Revision History
Revision #
1.0
Revision
Date
8/24/2020
Description
Initial Release
Pages
Updated
-
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.
MP4436/MP4436A Rev. 1.0
www.MonolithicPower.com
8/24/2020
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2020 MPS. All Rights Reserved.
38
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