MA5611ESA [MPOWER]
36V Synchronous Buck Converter;
| 型号： | MA5611ESA |
| 厂家： | 
Major-Power |
| 描述： | 36V Synchronous Buck Converter |
| 文件： | 总7页 (文件大小：396K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MA5611
36V Synchronous Buck Converter
GENERAL DESCRIPTION
The MA5611 is a monolithic synchronous buck regulator. The device integrates two internal
power MOSFETs, and provides 2.5A of continuous load current over a wide input voltage.
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 36V Operating Input Range
- Integrated 120mΩ Power MOSFET Switches
- Output Adjustable from VFB(1V±2%) to 16V
- Up to 93% Efficiency
- Internal Soft-Start t and Fixed 160KHz Frequency
- Stable with Low ESR Polymer Al-E-Capacitors
- Cycle-by-Cycle Over Current Protection
- Input Under/Over Voltage Lockout
TYPICAL CIRCUIT
INPUT 8V~32V
R5
C5
C6
0.1 F
24Ω 10nF
C1
C7
ON
OFF
OUTPUT
5V 2.4A
L1
BS
IN
EN
S
W
R1
PAD
VDD
MA5611
40kΩ
FB
GND
COMP
C2
C8
CFB
C4
0.1 F
3.3nF
15kΩ
D1
SS34
3.3nF
C3
R3
R2
10kΩ
VOUT=VFB × (1+R1/R2), VFB = 1.00V, R2 suggest 1k~40kΩ
Major Power Technology Co., Ltd.
Rev.1.2 Apr.12, 2017
1/7
MA5611
PIN ASSIGNMENT
The package of MA5611 is SOP8L-EP(Exposed pad); the pin assignment is given by:
Name
Description
BS Boot-Strap Pin. Supply high side gate driver.
Power Input pin. Bypass IN to GND with a suitably large capacitor to eliminate noise on
the input to the IC.
IN
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.
SW
GND Ground.
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.
FB
Compensation Node. COMP is used to compensate the regulation control loop. Connect
a series RC network from COMP to GND to compensate the regulation control loop.
COMP
EN Enable control. Pull high to turn on(Internal pull high ).
VDD Internal regulator pin
ORDER/MARKING INFORMATION
Order Information
Top Marking (SOP-8L)
Packing
MA5611 XX X
Blank: Tube
A : Taping
Package Type
ES: SOP8L-EP
Major Power Technology Co., Ltd.
Rev.1.2 Apr.12, 2017
2/7
MA5611
BLOCK DIAGRAM
IN
CURRENT
SENSE
AMPLIFIER
Internal
Regulator
VDD
Input UVLO
7.0V
VDD
BS
R
M1
EN
FB
2.5V
5.7V
PWM Control
&
Protect Logic
1.1V
SW
1V
M2
COMP
Softstart
GND
Thermal
Protection
A BSOLUTE MAXIMUM RATINGS (at TA=25°C)
Characteristics
Symbol
Rating
Unit
Supply Voltage
VIN
–0.3 to +42
– 0.3 to VIN + 0.3
VSW – 0.3 to VSW + 6
–0.3 to +6
260
V
V
Switch Node Voltage
VSW
Boost Voltage
VBS
V
All Other Pins
V
Lead Temperature
°C
°C
°C
V
Storage Temperature
–65 to +150
150
Junction Temperature
TJ
Output Voltage
VOUT
VFB to 20
–40 to +85
15
Ambient Operating Temperature
Thermal Resistance from Junction to case
Thermal Resistance from Junction to ambient
°C
°C/W
°C/W
θJC
θJA
40
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.1.2 Apr.12, 2017
3/7
MA5611
ELECTRICAL CHARACTERISTICS
(VIN = 12V, TA = +25°C, unless otherwise noted.)
Characteristics
Input Voltage Range
Symbol
Conditions
Min Typ Max Units
8
-
-
36
V
Shutdown Supply Current
Quiescent Current
ISD
VEN = 0V
0.9 1.3 mA
0.9 1.5 mA
VEN = 5.0V;
VFB = 1.05V
ICCQ
-
Feedback Voltage
VFB
8V ≤ VIN ≤ 36V
0.98 1.00 1.02
V
Feedback Overvoltage Threshold
OVP(FB)
-
-
1.1X
130
-
-
VFB
High-Side Switch On Resistance
(Note)
Low-Side Switch On Resistance
(Note)
RDS(ON)1
RDS(ON)2
mΩ
mΩ
-
-
120
-
-
High-Side Switch Leakage Current
Upper Switch Current Limit
Lower Switch Current Limit
Oscillation Frequency
VEN = 0V, VSW = 0V
10 μA
Minimum Duty Cycle 2.6 3.1
-
-
-
-
-
-
-
-
-
A
A
From Drain to Source
-
-
-
-
-
-
-
-
0.6
160
80
FOSC1
KHz
KHz
mS
%
Short Circuit Oscillation Frequency
Short Circuit Retry time(Note)
Maximum Duty Cycle
FOSC2 VFB< 0.4V
RTSCP VFB< 0.5V
DMAX
1
95
Minimum On Time (Note)
EN Lockout Threshold Voltage
EN Lockout Hysterisis
TON(min)
220
2.5
210
ns
ENH(LOCK)
V
mV
Input Under Voltage Lockout
Threshold
UVLO VIN Rising
6.5 7.0 7.5
V
Input Under Voltage Lockout
Threshold Hysteresis
UVLO-Hys
-
-
-
800
36
4
-
-
-
mV
V
OVLO VIN Rising
OVLO-Hys
Input Over Voltage Lockout Threshold
Input Over Voltage Lockout Threshold
Hysteresis
V
Soft-Start Period
-
-
-
2
-
-
-
ms
°C
°C
Thermal Shutdown
TSD
TSH
150
30
Thermal Shutdown Hysterisis
Note: Guaranteed by design.
Major Power Technology Co., Ltd.
Rev.1.2 Apr.12, 2017
4/7
MA5611
FUNCTION DESCRIPTIONS
The MA5611 is a synchronous rectified, current-mode, step-down regulator. It regulates
input voltages from 8V to 36V down to an output voltage as low as VFB, and supplies up to 2.5A
of load current.
The MA5611 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 MA5611 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
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 R2
VOUT= VFB ×
R2
For example, VFB =1.00V for a 5.0V output voltage, R2 is 10kΩ, and R1 is 40kΩ.
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
33uH
<35V
33uH
Inductor
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.1.2 Apr.12, 2017
5/7
MA5611
Output Short-Circuit protection
The MA5611 provides output short-circuit protection retry function. When VOUT is short
(VFB<0.5V), the auto restart function can be started that restart the regulator cycle by cycle.
(Retry time 1mS , Shutdown regulator time 20mS) .
TYPICAL CHARACTERISTICS
Power On : VIN= 12V, VOUT= 5V, ILOAD = 0A
Power On : VIN= 12V, VOUT= 5V, ILOAD = 2.5A
Cable On : VIN= 12V, VOUT= 5V, ILOAD = 2A
DYNA Load : VIN= 12V, VOUT= 5V, ILOAD = 0-2.5A
Ch1=SW , Ch2=VOUT ,Ch3=VIN , Ch4=IOUT
Ch1=SW , Ch2=VOUT ,Ch3=VIN , Ch4=IOUT
Major Power Technology Co., Ltd.
Rev.1.2 Apr.12, 2017
6/7
MA5611
PACKAGE OUTLINES
X
Expose Pad
θ
L
DETAIL A
b
D
(4X)
e
7
y
DETAIL A
Dimensions in Millimeters
Dimensions in Inches
Symbol
Min.
Nom.
Max.
Min.
Nom.
Max.
0.069
0.06
-
0.01
0.2
0.161
0.244
0.05
0.02
A
A1
A2
C
D
E
H
L
b
e
y
X
Y
-
0
1.25
0.1
4.7
3.7
5.8
0.4
0.31
-
-
-
1.75
0.15
-
0.25
5.1
4.1
6.2
1.27
0.51
-
0
-
-
-
0.049
0.2
4.9
3.9
6
0.0075
0.185
0.146
0.228
0.015
0.012
0.008
0.193
0.154
0.236
-
-
0.41
1.27 BSC
0.016
0.050 BSC
-
-
-
-
-
0.1
3.33
2.54
8O
-
-
-
0.004
0.131
0.10
8O
2.34
2.34
-
0.092
0.092
-
θ
0O
0O
Mold flash shall not exceed 0.25mm per side
JEDEC outline: MS-012 BA
Major Power Technology Co., Ltd.
Rev.1.2 Apr.12, 2017
7/7
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