MA5620 [MPOWER]
38V Synchronous Buck Controller;
| 型号： | MA5620 |
| 厂家： | 
Major-Power |
| 描述： | 38V Synchronous Buck Controller |
| 文件： | 总8页 (文件大小：291K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MA5620(Preliminary)
38V Synchronous Buck Controller With 2CH CC/CV
GENERAL DESCRIPTION
The MA5620 is a synchronous buck controller. The device need externals high side and
external low side power MOSFETs, and provides 5A of continuous load current and 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 small
TDFN-12L (3x3) package, provides a very compact solution with minimal external components.
FEATURES
- Wide 8V to 38V Operating Input Range
- Externals high side and low side Power MOSFET Switches
- Output Adjustable from VFB(1.00V±2%) to 16V
- Up to 95% Efficiency
- Internal Soft-Start and Fixed 160KHz Frequency
- Duty on ratio : 0% to 91% PWM control
- Cycle-by-Cycle Over Current Protection
- Input Under/Over Voltage Lockout
VIN=8~32V
APPLICATION CIRCUIT
R5
10mΩ
C5
100nF
C6
0.1μF
C1
220μF
35V
C7
10μF
35V
x2
M1
L1
33μH
SENSE VIN
BS
GH
NMOS
NMOS
VOUT=5V
MA5620
SGND
LX
PAD(GND)
M2
GL
FB
VREF
CS
2
CFB
3.3nF
R1
40kΩ
CS1 PGND
COMP
C8
5V 2.4A
VOUT1- VOUT2-
5V 2.4A
C2
C4
0.1μF
C3
470μF
22μF
3.3nF
R2
10kΩ
16V
10V
R3
RSEN
38mΩ
RSEN
38mΩ
15kΩ
VOUT=VFB × (1+R1/R2), VFB = 1.00V, R2 suggest 1k~30KΩ
SEN = 2.63A (ISEN=VCS(0.1V) / RSEN(38mΩ))
I
Major Power Technology Co., Ltd.
Rev.0.2 Jul 16, 2016
1/8
MA5620(Preliminary)
PIN ASSIGNMENT
The package of MA5620 is TDFN-12L (3x3) package; the pin assignment is given by:
(Top View)
(Top View)
1
2
3
4
5
6
12
11
10
9
BS
SENSE
VIN
VREF
CS2
14
13
12
11
10
9
1
2
3
4
5
6
7
LX
SGND
PGND
GL
GH
SENSE
VIN
CS1
BS
(GND )
COMP
GH
FB
SGND
VREF
CS2
COMP
CS1
8
LX
FB
8
GND
GL
7
SOP-14L
TDFN-12L (3 x 3)
Name
BS
Description
Boot-Strap Pin. Supply high side gate driver. Decouple this pin to LX pin with 0.1uF ceramic
cap.
SENSE Power Input Current limit sense.
Power Input pin. Bypass IN to GND with a suitably large capacitor to eliminate noise on the
input to the IC.
VIN
GH Gate drive for external high side N-MOSFET..
LX Switching sense.
GL Gate drive for external low side N-MOSFET..
PGND/
Power Ground.
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
CS1 The Current Sense 1 pin.
CS2 The Current Sense 2 pin.
VREF Internal regulator pin
PGND Ground.
PAD Ground (Connect to GND).
Major Power Technology Co., Ltd.
Rev.0.2 Jul 16, 2016
2/8
MA5620(Preliminary)
ORDER/MARKING INFORMATION
Order Information
Top Marking
BLOCK DIAGRAM
A BSOLUTE MAXIMUM RATINGS (at TA=25°C)
Characteristics
Symbol
Rating
–0.3 to +42
– 0.3 to VIN + 0.3
VSW – 0.3 to VSW + 6
–0.3 to +6
260
Unit
V
Supply Voltage
VIN
Switch Node Voltage
VSW
V
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
Major Power Technology Co., Ltd.
Rev.0.2 Jul 16, 2016
3/8
MA5620(Preliminary)
Note: θJA is measured with the PCB copper area of approximately 1 in2(Multi-layer). That need connect to exposed pad.
ELECTRICAL CHARACTERISTICS
(VIN = 12V, TA = +25°C, unless otherwise noted.)
Characteristics
Input Voltage Range
Symbol
Conditions
EN = 5.0V;
Min Typ Max Units
8
-
-
38
V
V
Quiescent Current
ICCQ
1
1.5 mA
VFB = 1.05V
Feedback Voltage
VFB
OVP(FB)
ICFB
8V ≤ VIN ≤ 38V
0.98 1.00 1.02
V
VFB
uA
ns
Feedback Overvoltage Threshold
Line compensation current(Note)
GH Rise Time
-
-
-
-
-
-
-
-
-
-
-
-
1.1X
4
-
-
-
-
-
-
-
-
-
-
-
-
VCS=100mV
CLX=1200pF
CLX=1200pF
CLX=1200pF
CLX=1200pF
TGHR
TGHF
TGLR
40
40
40
40
5
GH Fall Time
ns
GLRise Time
ns
GL Fall Time
TGLF
ns
LG driver bias supply voltage
Oscillation Frequency
V
FOSC1
160
80
1
KHz
KHz
mS
%
Short Circuit Oscillation Frequency
Short Circuit Retry time(Note)
Maximum Duty Cycle
FOSC2 VFB =< 0.4V
RTSCP VFB =< 0.5V
DMAX
91
220
Minimum On Time (Note)
Current Sense Voltage
EN Lockout Threshold Voltage
EN Lockout Hysterisis
TON(min)
ns
VCS1/2
90 100 110 mV
ENH(LOCK)
-
-
2.5
-
-
V
mV
V
210
UVLO VIN Rising
UVLO-Hys
6.5 7.0 7.5
Input Under Voltage Lockout Threshold
Input Under Voltage Lockout Threshold
Hysteresis
-
-
-
800
38
4
-
-
-
mV
V
OVLO VIN Rising
OVLO-Hys
Input Over Voltage Lockout Threshold
Input Over Voltage Lockout Threshold
Hysteresis
V
Soft-Start Period
-
-
-
3
-
-
-
ms
°C
°C
Thermal Shutdown
TSD
TSH
150
30
Thermal Shutdown Hysterisis
Note: Guaranteed by design.
Major Power Technology Co., Ltd.
Rev.0.2 Jul 16, 2016
4/8
MA5620(Preliminary)
FUNCTION DESCRIPTIONS
The MA5620 is a synchronous rectified, current-mode step-down controller. It regulates input
voltages from 8V to 38V down to an output voltage, and supplies up to 5A of load current.
The MA5620 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 controller uses external 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 MA5620 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.0.2 Jul 16, 2016
5/8
MA5620(Preliminary)
Output Short-Circuit protection
The MA5620 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) .
Output Cable Resistance Compensation
To compensate for resistive voltage drop across the charger's output cable, the MA5620
integrates a simple, user-programmable cable voltage drop compensation using the impedance at
the FB pin. Use the curve in Figure 1 to choose the proper feedback resistance values for cable
compensation. R1 is the high side resistor of voltage divider.
VOUT= VFB × ( 1+R1/R2 ) + R1 x IFB(4uA)
TYPICAL CHARACTERISTICS
Major Power Technology Co., Ltd.
Rev.0.2 Jul 16, 2016
6/8
MA5620(Preliminary)
PACKAGE OUTLINES
1. TDFN3x3-12L
Dimensions in Millimeters
Dimensions in Inches
Symbol
Min.
0.70
0.00
Nom.
0.75
0.02
Max.
0.80
0.05
Min.
0.028
0.000
Nom.
0.030
0.001
Max.
0.031
0.002
A
A1
A3
b
D
D2
E
E2
e
L
0.20 REF
0.25
3.00 BSC
2.50
3.00 BSC
1.60
0.008 REF
0.010
0.118 BSC
0.098
0.118 BSC
0.063
0.18
2.40
1.50
0.28
2.55
1.65
0.008
0.094
0.059
0.011
0.100
0.065
0.45 BSC
0.40
0.018 BSC
0.016
0.30
0.20
0.50
-
0.012
0.008
0.002
-
K
-
-
Major Power Technology Co., Ltd.
Rev.0.2 Jul 16, 2016
7/8
MA5620(Preliminary)
2. SOP14
Pin 1 indent
L
Detail A
D
C
e
b
Detail A
Dimensions In Millimeters
Dimensions In Inches
Symbol
Min.
Nom.
Max.
Min.
Nom.
Max.
A
A1
A2
b
1.47
1.60
1.730
0.0580
0.0040
-
0.063
0.0680
0.0100
-
0.10
0.250
-
-
-
1.45
0.41
0.20
8.64
6.00
3.90
1.27
0.71
0.057
0.016
0.008
0.340
0.236
0.153
0.050
0.028
-
0.33
0.19
8.53
5.80
3.80
-
0.510
0.250
8.740
6.200
3.990
-
0.0130
0.0075
0.3360
0.2283
0.1496
-
0.0200
0.0098
0.3440
0.2441
0.1571
-
C
D
E
E1
e
L
0.38
1.270
0.0150
0.0500
Major Power Technology Co., Ltd.
Rev.0.2 Jul 16, 2016
8/8
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