A7406AE6VR [AITSEMI]
DC-DC CONVERTER BUCK ASYNCHRONOUS;
| 型号： | A7406AE6VR |
| 厂家： | 
AiT Semiconductor |
| 描述： | DC-DC CONVERTER BUCK ASYNCHRONOUS DC-DC转换器 |
| 文件： | 总10页 (文件大小：258K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
A7406A
AiT Semiconductor Inc.
DC-DC CONVERTER BUCK (STEP-DOWN)
40V, 600mA ASYNCHRONOUS
www.ait-ic.com
DESCRIPTION
FEATURES
The A7406A is
a
high frequency (1.8MHz)
4.2 V to 40 V operating input range
230uA operating quiescent current.
step-down switching regulator with integrated
internal high-side high voltage power MOSFET. It
provides single 0.6A(or less) highly efficient output
with current mode control for fast loop response.
The wide input range(4.2V to 40V) accommodates
a variety of step-down applications. Low shutdown
Low shutdown supply current
500mΩ internal power MOSFET
1.8 MHz fixed switching frequency
>90% efficiency
Internally compensated
mode
quiescent
current
allows
use
in
Stable with ceramic output capacitors
Internal soft-start
battery-powered applications.
High efficiency at light load condition is achieved by
scaling down the switching frequency to reduce the
switching and gate driving losses.
Thermal shutdown function
Precision current limit without current sensing
resistor
Available in SOT-26 Package
The A7406A is available in SOT-26 package.
APPLICATION
ORDERING INFORMATION
High voltage power conversion
Package Type
Part Number
A7406AE6R
A7406AE6VR
Industrial power systems
Power meter
SOT-26
E6
SPQ: 3,000pcs/Reel
Battery powered systems
V: Halogen free Package
R: Tape & Reel
Note
TYPICAL APPLICATION
AiT provides all RoHS products
REV1.0
- MAR 2018 RELEASED -
- 1 -
A7406A
AiT Semiconductor Inc.
DC-DC CONVERTER BUCK (STEP-DOWN)
40V, 600mA ASYNCHRONOUS
www.ait-ic.com
PIN DESCRIPTION
Top View
Pin #
Symbol
Function
Bootstrap. This is the positive power supply for the internal floating high side
MOSFET driver. Connect a bypass capacitor between this pin and SW pin.
Ground. It should be connected as close as possible to the output capacitor.
Feedback. This is the input to the error amplifier. An external resistive divider
connected between the output and GND is compared to the internal +0.8V reference
to set the regulation voltage.
1
2
BST
GND
3
4
FB
EN
Enable input. Pull this pin below the specified threshold to disable. Pull it above the
specified threshold to enable. Float this pin to disable.
Input Supply. A decoupling capacitor to ground is required close to this pin to reduce
switching spikes.
5
6
VIN
SW
Switch node. This is the output from the high-side switch. A low VF
REV1.0
- MAR 2018 RELEASED -
- 2 -
A7406A
AiT Semiconductor Inc.
DC-DC CONVERTER BUCK (STEP-DOWN)
40V, 600mA ASYNCHRONOUS
www.ait-ic.com
ABSOLUTE MAXIMUM RATINGS
VIN, Supply Voltage
VSW, Switch Voltage
BST to SW
-0.3V ~ 43V
-0.3V ~ VIN (MAX)+0.3V
-0.3V ~ 6.0V
-0.3V ~ 5.0V
0.57W
All Other Pins
Continuous Power Dissipation(TA=+25℃)
Junction Temperature
Lead Temperature
150℃
260℃
Storage Temperature
-65°C ~ 150℃
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
Symbol
VIN
Value
Unit
V
Supply Voltage
Output Voltage
4.2 ~ 40
VOUT
TJ
Up to 40
V
Operating Junction Temp
-40 ~ +125
℃
THERMAL RESISTANCE
Package
SOT-26
θJA
θJC
110℃/W
220℃/W
REV1.0
- MAR 2018 RELEASED -
- 3 -
A7406A
AiT Semiconductor Inc.
DC-DC CONVERTER BUCK (STEP-DOWN)
40V, 600mA ASYNCHRONOUS
www.ait-ic.com
ELECTRICAL CHARACTERISTICS
VIN=12V, VEN=2V, TA=25ºC, unless otherwise stated.
Parameter
Feedback Voltage
Symbol
VFB
Conditions
Min.
-
Typ.
Max.
-
Unit
V
0.794
-
Upper Switch ON Resistance
Vbst-VSW=5V
RSW
ISWLEAK
ILIM
500
0.1
1
-
1
-
mΩ
μA
A
Upper Switch Leakage
Current Limit
VEN=0V, VSW=0V
-
-
Transconductance
Gcs
COMP to SENSE
-
3
-
A/V
V
4.2
Minimum Operating Voltage
VIN MIN
-
-
3.3
UVLO Up Threshold
UVLO Hysteresis
Soft-Start Time
VIN(UVLO)
VIN(UVLO) HYS
tSS
-
4.2
V
V
-
-
-
-
0.8
0.5
1.8
-
-
-
FB from 0 to 1.8V
ms
MHz
Oscillator Frequency
Minimum Switch ON
Time
fOSC
tON MIN
100
-
ns
-
-
Shutdown Current
Quiescent Current
Thermal Shutdown
Enable up threshold
Enable Threshold Hysteresis
ISD
IQ
VEN<0.3V
3
200
150
-
15
μA
μA
°C
V
VFB=0.9V，No load
-
-
-
TSD
1.6
-
VENH
VENHYS
2.0
-
0.6
V
REV1.0
- MAR 2018 RELEASED -
- 4 -
A7406A
AiT Semiconductor Inc.
DC-DC CONVERTER BUCK (STEP-DOWN)
40V, 600mA ASYNCHRONOUS
www.ait-ic.com
TYPICAL APPLICATION CIRCUITS
REV1.0
- MAR 2018 RELEASED -
- 5 -
A7406A
AiT Semiconductor Inc.
DC-DC CONVERTER BUCK (STEP-DOWN)
40V, 600mA ASYNCHRONOUS
www.ait-ic.com
BLOCK DIAGRAM
REV1.0
- MAR 2018 RELEASED -
- 6 -
A7406A
AiT Semiconductor Inc.
DC-DC CONVERTER BUCK (STEP-DOWN)
40V, 600mA ASYNCHRONOUS
www.ait-ic.com
DETAILED INFORMATION
The A7406A is a 1.8MHz, non-synchronous, step-down switching regulator with integrated internal high side
MOSFET. It provides internally compensated single 0.6A high efficient output. It features wide input voltage
range, internal soft-start control, and precision current limit. Low operational quiescent current feature is suit
for battery powered applications.
PWM Control
At heavy load or moderate load condition, the A7406A operates in a fixed frequency, peak current control
mode to regulate the output voltage. A PWM cycle is initiated by the internal clock. The power MOSFET is
turned on and remains on until its current reaches the value set by COMP voltage. When the power switch is
off, it remains off for at least 100ns before the next cycle starts. If, in one PWM period, the current in the power
MOSFET does not reach COMP set current value, the power MOSFET remains on, saving a turn-off
operation. At light load condition, the A7406A operates in pulse skipping mode to improve light load efficiency.
Internal Regulator
Most of the internal circuitry is powered on by the 2.6V internal regulator.
When VIN is higher than 4.0V, the output of the regulator is in full regulation.
When VIN is lower, the output degrades.
Under Voltage Lockout (UVLO)
VIN Under voltage lockout (UVLO) is implemented to protect the chip from operating at insufficient supply
voltage.
Thermal Shutdown
Thermal shutdown is implemented to prevent the chip from thermally running away. When the temperature is
higher than its upper threshold, the A7406A will shut down. When the temperature is lower than its lower
threshold, the chip is enabled again.
REV1.0
- MAR 2018 RELEASED -
- 7 -
A7406A
AiT Semiconductor Inc.
DC-DC CONVERTER BUCK (STEP-DOWN)
40V, 600mA ASYNCHRONOUS
www.ait-ic.com
APPLICATION INFORMATION
Setting the Output Voltage
The output voltage is set using a resistive voltage divider from the output voltage to FB pin.
VFB=VOUT*R2/(R1+R2)
The feedback resistor R1 also sets the feedback loop bandwidth with the internal compensation capacitor.
Choose R1 around 124kΩ for optimal transient response.
Inductor
The inductor is required to supply constant current to the output load. A larger value inductor will result in
lower output ripple voltage. Generally, 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 load current.
Also, make sure that the peak inductor current is below the maximum switch current limit.
Input Capacitor
The input capacitor (C1) can be electrolytic, tantalum or ceramic. When using electrolytic or tantalum
capacitors, a small, high quality ceramic capacitor, i.e.
0.1μF, should be placed as close to the IC as possible.
Output Capacitor
The output capacitor (C2) is used to maintain the DC output voltage. Ceramic, tantalum, or low ESR
electrolytic capacitors are recommended. Low ESR capacitors are preferred to keep the output voltage ripple
low.
REV1.0
- MAR 2018 RELEASED -
- 8 -
A7406A
AiT Semiconductor Inc.
DC-DC CONVERTER BUCK (STEP-DOWN)
40V, 600mA ASYNCHRONOUS
www.ait-ic.com
PACKAGE INFORMATION
Dimension in SOT-26 Package (Unit: mm)
REV1.0
- MAR 2018 RELEASED -
- 9 -
A7406A
AiT Semiconductor Inc.
DC-DC CONVERTER BUCK (STEP-DOWN)
40V, 600mA ASYNCHRONOUS
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 server 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 2018 RELEASED -
- 10 -
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