A7632AE6VR [AITSEMI]
DC-DC CONVERTER BOOST HIGH EFFICIENCY;
| 型号： | A7632AE6VR |
| 厂家： | 
AiT Semiconductor |
| 描述： | DC-DC CONVERTER BOOST HIGH EFFICIENCY 功效 DC-DC转换器 |
| 文件： | 总10页 (文件大小：438K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
A7632A
DC-DC CONVERTER BOOST (STEP-UP)
HIGH EFFICIENCY 1.2MHz 28V 2A
AiT Semiconductor Inc.
www.ait-ic.com
DESCRIPTION
FEATURES
The A7632A is a constant frequency, current mode
step-up converter intended for small, low power
applications. The A7632A switches at 1.2MHz and
allows the use of tiny, low cost capacitors and
inductors 2mm or less in height. Internal soft-start
results in small inrush current and extends battery
life.
2V to 24V Input Voltage
Up to 28V Output Voltage
Integrated 80mΩ Power MOSFET
1.2MHz Fixed Switching Frequency
Internal 4A Switch Current Limit
Internal Compensation
Thermal Shutdown
The A7632A includes under-voltage lockout,
current limiting, and thermal overload protection to
prevent damage in the event of an output overload.
Output Adjustable from 0.6V
Available in SOT-26 Package
APPLICATION
The A7632A is available in SOT-26 package.
ABS Set-Top Boxed
DVB-S/S2
ORDERING INFORMATION
TYPICAL APPLICATION
Package Type
Part Number
A7632AE6R
A7632AE6VR
SOT-26
E6
SPQ: 3,000pcs/Reel
V: Halogen free Package
R: Tape & Reel
Note
AiT provides all RoHS products
REV1.0
- MAR 2017 RELEASED -
- 1 -
A7632A
DC-DC CONVERTER BOOST (STEP-UP)
HIGH EFFICIENCY 1.2MHz 28V 2A
AiT Semiconductor Inc.
www.ait-ic.com
PIN DESCRIPTION
Top View
Pin #
1
Symbol
SW
Function
Power Switch Output. SW is the drain of the internal MOSFET switch. Connect
the power inductor and output rectifier to SW. SW can swing between GND and
28V.
2
3
GND
FB
Ground.
Feedback Input. The FB voltage is 0.6V. Connect a resistor divider to FB.
Regulator On/Off Control Input. A high input at EN turns on the converter, and a
low input turns it off. When not used, connect EN to the input supply for
automatic startup.
4
EN
5
6
VIN
Power Supply. Must be locally bypassed.
NC
No Connection
REV1.0
- MAR 2017 RELEASED -
- 2 -
A7632A
DC-DC CONVERTER BOOST (STEP-UP)
HIGH EFFICIENCY 1.2MHz 28V 2A
AiT Semiconductor Inc.
www.ait-ic.com
ABSOLUTE MAXIMUM RATINGS
VIN, EN Pin Voltage
SW Pin Voltage
-0.3V ~ 26V
-0.3V ~ 26V
-0.3V~ 6V
All Other Pin Voltage
TJ, Junction Temperature
TA, Ambient Temperature
150°C
-40°C~ 85°C
600mW
Power Dissipation
SOT-26
θJA, Thermal Resistance
θJC, Thermal Resistance
TS, Storage Temperature
Lead Temperature & Time
SOT-26
SOT-26
250°C /W
130°C /W
-65°C ~ 150°C
260°C, 10sec
Stress beyond above listed “Absolute Maximum Ratings” may lead permanent damage to the device. These are stress ratings only and
operations of the device at these or any other conditions beyond those indicated in the operational sections of the specifications are not
implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
RECOMMENDED OPERATING CONDITIONS
Parameter
Input Voltage Range
Symbol
TJ
Value
2 to 24
Units
V
Output Voltage Range
VIN to 28
-40 to 125
V
Operating Junction Temperature
°C
REV1.0
- MAR 2017 RELEASED -
- 3 -
A7632A
DC-DC CONVERTER BOOST (STEP-UP)
HIGH EFFICIENCY 1.2MHz 28V 2A
AiT Semiconductor Inc.
www.ait-ic.com
ELECTRICAL CHARACTERISTICS
TA=25°C, unless otherwise noted
Parameter
Operating Input Voltage
Feedback Voltage
FB Input Bias Current
SW Leakage
Symbol
VIN
Conditions
Min.
Typ.
-
Max.
Unit
V
2
24
VFB
588
600
-10
-
612
mV
nA
μA
mA
μA
MHz
%
IFB
VFB=0.6V
-50
-
VSW=20V
-
-
-
-
-
-
-
-
-
1
VFB=0.5V, Switch
VEN=0V
0.2
0.1
1.2
90
1
0.4
Quiescent Current
IQ
1
Oscillator Frequency
Maximum Duty Cycle
EN Threshold
fSW
DMAX
VEN
VFB=0.75V
VFB=0.7V
-
-
-
V
SW On-Resistance
Current Limit
80
4
150
mΩ
A
ILIMIT
VIN=5V, Duty Cycle = 50%
-
-
Thermal Shutdown
160
°C
REV1.0
- MAR 2017 RELEASED -
- 4 -
A7632A
DC-DC CONVERTER BOOST (STEP-UP)
HIGH EFFICIENCY 1.2MHz 28V 2A
AiT Semiconductor Inc.
www.ait-ic.com
TYPICAL PERFORMANCE CHARACTERISTICS
1.
3.
5.
Efficiency vs. Output Current (VOUT=5V)
Efficiency vs. Output Current (VOUT=19V)
Load Regulation (VOUT=14V)
2.
4.
6.
Efficiency vs. Output Current (VOUT=14V)
Load Regulation (VOUT=5V)
Load Regulation (VOUT=19V)
REV1.0
- MAR 2017 RELEASED -
- 5 -
A7632A
DC-DC CONVERTER BOOST (STEP-UP)
HIGH EFFICIENCY 1.2MHz 28V 2A
AiT Semiconductor Inc.
www.ait-ic.com
7.
Line Regulation
8.
VOUT vs. Temperature
BLOCK DIAGRAM
REV1.0
- MAR 2017 RELEASED -
- 6 -
A7632A
DC-DC CONVERTER BOOST (STEP-UP)
HIGH EFFICIENCY 1.2MHz 28V 2A
AiT Semiconductor Inc.
www.ait-ic.com
DETAILED DESCRIPTION
The A7632A uses a fixed frequency, peak current mode boost regulator architecture to regulate voltage at the
feedback pin. The operation of the A7632A can be understood by referring to the block diagram. At the start of
each oscillator cycle the MOSFET is turned on through the control circuitry. To prevent sub-harmonic
oscillations at duty cycles greater than 50 percent, a stabilizing ramp is added to the output of the current
sense amplifier and the result is fed into the negative input of the PWM comparator. When this voltage equals
The output voltage of the error amplifier the power MOSFET is turned off. The voltage at the output of the
error amplifier is an amplified version of the difference between the 0.6V band gap reference voltage and the
feedback voltage. In this way the peak current level keeps the output in regulation. If the feedback voltage
starts to drop, the output of the error amplifier increases. These results in more current to flow through the
power MOSFET, thus increasing the power delivered to the output. The A7632A has internal soft start to limit
the amount of input current at startup and to also limit the amount of overshoot on the output.
APPLICATION INFORMATION
Setting the Output Voltage
The internal reference VREF is 0.6V (Typical).The output voltage is divided by a resistor divider, R1 and R2 to
the FB pin. The output voltage is given by
R1
R2
VOUT = VREF
X
1+
Inductor Selection
The recommended values of inductor are 4.7 to 22μH. Small size and better efficiency are the major concerns
for portable device, such as A7632A used for mobile phone. The inductor should have low core loss at
1.2MHz and low DCR for better efficiency. To avoid inductor saturation current rating should be considered.
Capacitor Selection
Input and output ceramic capacitors of 22μF are recommended for A7632A applications. For better voltage
filtering, ceramic capacitors with low ESR are recommended. X5R and X7R types are suitable because of
their wider voltage and temperature ranges.
Diode Selection
Schottky diode is a good choice for A7632A because of its low forward voltage drop and fast reverses
recovery. Using Schottky diode can get better efficiency. The high speed rectification is also a good
characteristic of Schottky diode for high switching frequency. Current rating of the diode must meet the root
mean square of the peak current and output average current multiplication as following:
REV1.0
- MAR 2017 RELEASED -
- 7 -
A7632A
DC-DC CONVERTER BOOST (STEP-UP)
HIGH EFFICIENCY 1.2MHz 28V 2A
AiT Semiconductor Inc.
www.ait-ic.com
ID(RMS)
≈
IOUTx IPEAK
The diode’s reverse breakdown voltage should be larger than the output voltage.
Layout Consideration
When laying out the printed circuit board, the following checking should be used to ensure proper operation of
the A7632A.
Check the following in your layout:
1. The power traces, consisting of the GND trace, the SW trace and the VIN, trace should be kept short,
direct and wide.
2. Does the (+) plates of Cin connect to Vin as closely as possible. This capacitor provides the AC current to
the internal power MOSFETs.
3. Keep the switching node SW away from the sensitive VOUT node.
4. Keep the (-) plates of Cin and Cout as close as possible
REV1.0
- MAR 2017 RELEASED -
- 8 -
A7632A
DC-DC CONVERTER BOOST (STEP-UP)
HIGH EFFICIENCY 1.2MHz 28V 2A
AiT Semiconductor Inc.
www.ait-ic.com
PACKAGE INFORMATION
Dimension in SOT-26 (Unit: mm)
REV1.0
- MAR 2017 RELEASED -
- 9 -
A7632A
DC-DC CONVERTER BOOST (STEP-UP)
HIGH EFFICIENCY 1.2MHz 28V 2A
AiT Semiconductor Inc.
www.ait-ic.com
IMPORTANT NOTICE
AiT Semiconductor Inc. (AiT) reserves the right to make changes to any its product, specifications, to
discontinue any integrated circuit product or service without notice, and advises its customers to obtain the
latest version of relevant information to verify, before placing orders, that the information being relied on is
current.
AiT Semiconductor Inc.'s integrated circuit products are not designed, intended, authorized, or warranted to
be suitable for use in life support applications, devices or systems or other critical applications. Use of AiT
products in such applications is understood to be fully at the risk of the customer. As used herein may involve
potential risks of death, personal injury, or servere property, or environmental damage. In order to minimize
risks associated with the customer's applications, the customer should provide adequate design and
operating safeguards.
AiT Semiconductor Inc. assumes to no liability to customer product design or application support. AiT
warrants the performance of its products of the specifications applicable at the time of sale.
REV1.0
- MAR 2017 RELEASED -
- 10 -
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