MA5604 38V 5A Synchronous Buck Converter
MA5604
38V 5A Synchronous Buck Converter

GENERAL DESCRIPTION
The MA5604 is a monolithic synchronous buck regulator. The device integrates internal high
side and external low side power MOSFETs, and provides 5A of continuous load current over a
wide input voltage of 8V to 38V. Current mode control provides fast transient response and
cycle-by-cycle current limit.
An internal soft-start prevents inrush current at turn-on, This device available in SOP8L-EP
(Exposed pad) package, provides a very compact solution with minimal external components.

-
FEATURES
Wide 8V to 38V Operating Input Range
Integrated 80mΩ high side Power MOSFET Switches
Output Adjustable from VFB(1V) to 20V
Up to 95% Efficiency
Internal Soft-Start
Stable with Low ESR Polymer Al-E-Capacitors
Fixed 160KHz Frequency
Cycle-by-Cycle Over Current Protection
Input Under/Over Voltage Lockout

APPLICATION CIRCUIT
INPUT
C1
C7
10
R4
100kΩ
EN
C4
3.3nF
15kΩ
0Ω
C5
100nF
MA5604
C3
R3
OUTPUT
5V 5A
L1
BS
IN
PAD(GND)
VDD
COMP
0.1μF
R5
C6
0.1 F
33μH
SW
LG
FB
Q1
NMOS
R1
40kΩ
CFB
3.3nF
C8
22μF
10V
R2
10kΩ
C2
470μF
10V
VOUT=VFB × (1+R1/R2), VFB = 1.00V, R2 suggest 10k~30kΩ
Major Power Technology Co., Ltd.
Rev.1.3
1/7
Apr.12, 2017
MA5604
 PIN ASSIGNMENT
The package of MA5604 is SOP8L-EP(Exposed pad); the pin assignment is given by:
Name
BS
IN
SW
Description
Boot-Strap Pin. Supply high side gate driver. Decouple this pin to LX pin with 0.1uF
ceramic cap.
Power Input pin. Bypass IN to GND with a suitably large capacitor to eliminate noise on
the input to the IC.
Power Switching Output. SW is the switching node that supplies power to the output.
Connect the output LC filter from SW to the output load.
LG
Gate drive for external low side N-MOSFET..
PAD
Ground (Connect to GND).
Feedback Input. FB senses the output voltage to regulate that voltage. Drive FB with a
resistive voltage divider from the output voltage.
Compensation Node. COMP is used to compensate the regulation control loop. Connect
COMP
a series RC network from COMP to GND to compensate the regulation control loop.
EN Enable control. Pull high to turn on. Do not float.
FB
VDD

Internal regulator pin
ORDER/MARKING INFORMATION
Order Information
Top Marking (SOP-8L)
Major Power Technology Co., Ltd.
Rev.1.3
2/7
Apr.12, 2017
MA5604

BLOCK DIAGRAM

A BSOLUTE MAXIMUM RATINGS (at TA=25°C)
Characteristics
Symbol
VIN
VSW
VBS
Supply Voltage
Switch Node Voltage
Boost Voltage
All Other Pins
Lead Temperature
Storage Temperature
Junction Temperature
Output Voltage
Ambient Operating Temperature
Thermal Resistance from Junction to case
Thermal Resistance from Junction to ambient
TJ
VOUT
θJC
θJA
Rating
–0.3 to +42
– 0.3 to VIN + 0.3
VSW – 0.3 to VSW + 6
–0.3 to +6
260
–65 to +150
150
VFB to 20
–40 to +85
15
40
Unit
V
V
V
V
°C
°C
°C
V
°C
°C/W
°C/W
Note: θJA is measured with the PCB copper area of approximately 1 in2(Multi-layer). That need connect to exposed pad.
Major Power Technology Co., Ltd.
Rev.1.3
3/7
Apr.12, 2017
MA5604
 ELECTRICAL CHARACTERISTICS
(VIN = 12V, TA = +25°C, unless otherwise noted.)
Characteristics
Symbol
Conditions
Input Voltage Range
Shutdown Supply Current
ISD
Quiescent Current
ICCQ
Feedback Voltage
VFB
Feedback Overvoltage Threshold
High-Side Switch On Resistance
(Note)
High-Side Switch Leakage Current
VEN = 0V
VEN = 5.0V;
VFB = 1.05V
8V ≤ VIN ≤ 38V
Min Typ Max Units
8
-
38
V
-
0.7
1.3
mA
-
0.7
1.5
mA
0.98 1.00 1.02
V
OVP(FB)
-
1.1X
-
VFB
RDS(ON)1
-
80
-
mΩ
VEN = 0V, VSW = 0V
-
-
10
μA
Minimum Duty Cycle
5.1
6.0
-
A
High-Side Switch Current Limit
LG Rise Time
TLXR
CLX=1000pF
-
40
-
ns
LG Fall Time
TLXF
CLX=1000pF
-
40
-
ns
-
5
-
V
-
160
-
KHz
-
60
-
KHz
LG driver bias supply voltage
Oscillation Frequency
FOSC1
Short Circuit Oscillation Frequency
FOSC2
Maximum Duty Cycle
DMAX
-
90
-
%
TON(min)
-
220
-
ns
ENH(LOCK)
-
2.5
-
V
-
210
-
mV
6.5
7.0
7.5
V
-
800
-
mV
-
40
-
V
-
5
-
V
-
3
-
ms
Minimum On Time (Note)
EN Lockout Threshold Voltage
VFB =< 0.5V
EN Lockout Hysterisis
Input Under Voltage Lockout
UVLO VIN Rising
Threshold
Input Under Voltage Lockout
UVLO-Hys
Threshold Hysteresis
Input Over Voltage Lockout Threshold OVLO VIN Rising
Input Over Voltage Lockout Threshold
OVLO-Hys
Hysteresis
Soft-Start Period
Thermal Shutdown
TSD
-
150
-
°C
Thermal Shutdown Hysterisis
TSH
-
30
-
°C
Note: Guaranteed by design.
Major Power Technology Co., Ltd.
Rev.1.3
4/7
Apr.12, 2017
MA5604

FUNCTION DESCRIPTIONS
The MA5604 is a synchronous rectified, current-mode, step-down regulator. It regulates
input voltages from 8V to 38V down to an output voltage as low as VFB, and supplies up to 5A
of load current.
The MA5604 uses current-mode control to regulate the output voltage. The output voltage
is measured at FB through a resistive voltage divider and amplified through the internal Tran
conductance error amplifier. The voltage at the COMP pin is compared to the switch current
measured internally to control the output voltage.
The converter uses internal N-Channel MOSFET switches to step-down the input voltage
to the regulated output voltage. Since the high side MOSFET requires a gate voltage greater
than the input voltage, a boost capacitor connected between SW and BS is needed to drive the
high side gate. The boost capacitor is charged from the internal 5V rail when SW is low.
When the MA5604 FB pin exceeds 10% of the nominal regulation voltage of VFB, the over
voltage comparator is tripped and the COMP pin is discharged to GND, forcing the high-side
switch off.
 APPLICATION INFORMATION
COMPONENT SELECTION
Setting the Output Voltage
The output voltage is set using a resistive voltage divider from the output voltage to FB
pin. The voltage divider divides the output voltage down to the feedback voltage by the ratio.
Thus the output voltage is:
R1  R 2
R2
For example, VFB =1.00V for a 5.0V output voltage, R2 is 10kΩ, and R1 is 40kΩ.
VOUT= VFB ×
Inductor Selection
The inductor is required to supply constant current to the output load while being driven
by the switched input voltage. A larger value inductor will result in less ripple current that will
result in lower output ripple voltage. However, the larger value inductor will have a larger
physical size, higher series resistance, and/or lower saturation current. A good rule for
determining the inductance to use is to allow the peak-to-peak ripple current in the inductor to
be approximately 30% of the maximum switch current limit.
VIN
<28V
<35V
Inductor
47uH
33uH
The choice of which style inductor to use mainly depends on the price vs. size
requirements and any EMI requirements.
Major Power Technology Co., Ltd.
Rev.1.3
5/7
Apr.12, 2017
MA5604
 TYPICAL CHARACTERISTICS
Power On :VIN = 12V, VOUT = 5V, ILOAD =0A
Ch1=SW , Ch2=VOUT ,Ch3=VIN , Ch4=IOUT
EN On: VIN = 12V, VOUT = 5V, ILOAD = 5A
Cable On: VIN = 12V, VOUT = 5V, ILOAD = 5A
Ch1=SW , Ch2=VOUT ,Ch3=VIN , Ch4=IOUT
Ch1=SW , Ch2=VOUT ,Ch3=VIN , Ch4=IOUT
Major Power Technology Co., Ltd.
Rev.1.3
6/7
Apr.12, 2017
MA5604
PACKAGE OUTLINES

H
E
Expose Pad
Y
X
θ
L
DETAIL A
b
D
e


y
A1
C
A
A2
7 (4X)
DETAIL A
Dimensions in Millimeters
Min.
Nom.
Max.
1.75
0
0.15
1.25
0.1
0.2
0.25
4.7
4.9
5.1
3.7
3.9
4.1
5.8
6
6.2
0.4
1.27
0.31
0.41
0.51
1.27 BSC
0.1
2.34
3.33
2.34
2.54
O
0
8O
Mold flash shall not exceed 0.25mm per side
JEDEC outline: MS-012 BA
Symbol
A
A1
A2
C
D
E
H
L
b
e
y
X
Y
θ


Major Power Technology Co., Ltd.
Dimensions in Inches
Min.
Nom.
Max.
0.069
0
0.06
0.049
0.0075
0.008
0.01
0.185
0.193
0.2
0.146
0.154
0.161
0.228
0.236
0.244
0.015
0.05
0.012
0.016
0.02
0.050 BSC
0.004
0.092
0.131
0.092
0.10
O
0
8O
Rev.1.3
7/7
Apr.12, 2017
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