A7630E6VR [AITSEMI]
DC-DC CONVERTER BOOST STEP-UP LED DRIVER;
| 型号： | A7630E6VR |
| 厂家： | 
AiT Semiconductor |
| 描述： | DC-DC CONVERTER BOOST STEP-UP LED DRIVER 驱动 DC-DC转换器 |
| 文件： | 总7页 (文件大小：357K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
A7630
DC-DC CONVERTER BOOST (STEP-UP)
1.2MHz, 28V STEP-UP LED DRIVER
AiT Semiconductor Inc.
www.ait-ic.com
DESCRIPTION
FEATURES
A7630 is a step-up converter designed for driving
up to 7 series white LED's from a single cell Lithium
Ion battery. Its low 250mV feedback voltage
reduces power loss and improves efficiency.
2.5V to 5.5V Input Voltage
Drivers up to 8 Series WLEDs
Low 250mV Feedback Voltage
1.2MHz Fixed Switching Frequency
Internal 1.6A Switch Current Limit
Internal Compensation
Optimized operation frequency can meet the
requirement of small LC filters value and low
operation current with high efficiency. Internal soft
start function can reduce the inrush current. Tiny
package type provides the best solution for PCB
space saving and total BOM cost.
Thermal Shutdown
Over Voltage Protection
Dimming with wide Frequency Range
Available in SOT-26 Package
APPLICATION
The A7630 is available in SOT-26 package.
Camera Flash White LED
PDA LED back light
Digital still cameras
ORDERING INFORMATION
TYPICAL APPLICATION
Package Type
SOT-26
Part Number
A7630E6R
E6
A7630E6VR
V: Halogen free Package
R: Tape & Reel
Note
SPQ: 3,000pcs/Reel
AiT provides all RoHS products
0.25V
R1
NOTE: 1. ILED
=
2. The decupling capacitors Cin should be
placed as close to the IC as possible.
REV1.0
- FEB 2017 RELEASED -
- 1 -
A7630
DC-DC CONVERTER BOOST (STEP-UP)
1.2MHz, 28V STEP-UP LED DRIVER
AiT Semiconductor Inc.
www.ait-ic.com
PIN DESCRIPTION
Top View
Pin #
1
Symbol
LX
Function
Power Switch Output. LX is the drain of the internal MOSFET switch. Connect the
power inductor and output rectifier to LX. LX can swing between GND and 30V.
Ground.
2
3
GND
FB
Feedback Input. The FB voltage is 0.25V. Connect a resistor divider to FB.
Chip enable, but a PWM signal with various duty cycle can directly sent to EN pin
to achieve the backlight dimming.
4
EN
Over Voltage Input. OV measures the output voltage for open circuit protection.
Connect OV to the output at the top of the LED string.
Power Supply. Must be locally bypassed.
5
6
OVP
IN
REV1.0
- FEB 2017 RELEASED -
- 2 -
A7630
DC-DC CONVERTER BOOST (STEP-UP)
1.2MHz, 28V STEP-UP LED DRIVER
AiT Semiconductor Inc.
www.ait-ic.com
ABSOLUTE MAXIMUM RATINGS
IN, EN Pin Voltage
-0.3V ~ 6V
-0.3V ~ 30V
-0.3V~ 6V
SW Pin Voltage
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 Ratingsꢁ 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
Units
V
2.5 to 5.5
VIN to 30
-40 to 125
Output Voltage Range
V
Operating Junction Temperature
°C
REV1.0
- FEB 2017 RELEASED -
- 3 -
A7630
DC-DC CONVERTER BOOST (STEP-UP)
1.2MHz, 28V STEP-UP LED DRIVER
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
2.5
-
5.5
VFB
237
250
-10
-
263
mV
nA
μA
mA
μA
MHz
%
IFB
-50
-
VSW=20V
-
-
-
-
-
-
-
-
-
-
1
VFB=0.2V, Switch
VEN=0V
0.15
0.1
1.2
90
0.3
Quiescent Current
IQ
1
Oscillator Frequency
Maximum Duty Cycle
EN Threshold
fSW
DMAX
VEN
-
-
1
-
V
OVP Threshold
VOVP
28
-
V
SW On-Resistance
Current Limit
400
1.6
160
650
mΩ
A
ILIMIT
VIN=4V, Duty Cycle = 50%
-
-
Thermal Shutdown
°C
REV1.0
- FEB 2017 RELEASED -
- 4 -
A7630
DC-DC CONVERTER BOOST (STEP-UP)
1.2MHz, 28V STEP-UP LED DRIVER
AiT Semiconductor Inc.
www.ait-ic.com
TYPICAL PERFORMANCE CHARACTERISTICS
1.
EN pin Bias Current vs. EN pin Voltage
(VEN=Vin)
2.
Quiescent Current vs. Supply Voltage
(VEN=0V)
3.
FB Pin Voltage vs. Supply Voltage
4.
Efficiency vs. Output Current (4LEDs)
5.
Max. Output Current vs. Output Voltage
6.
FB Pin Voltage vs. Supply Voltage
REV1.0
- FEB 2017 RELEASED -
- 5 -
A7630
DC-DC CONVERTER BOOST (STEP-UP)
1.2MHz, 28V STEP-UP LED DRIVER
AiT Semiconductor Inc.
www.ait-ic.com
PWM BRIGHTNESS DIMMING CONTROL at EN PIN
When EN pin is forced a PWM signal with frequency higher than 20kHz, the chip is in dimming mode. The
internal circuit changes the feedback voltage according to the duty cycle of the PWM signal. The feedback
voltage (VFB) is simply defined as below:
VFB=250mV x Duty Cycle (%)
To shut down the chip, one has to make the EN signal low, and keep its low state for more than 2.5ms.
PACKAGE INFORMATION
Dimension in SOT-26 (Unit: mm)
REV1.0
- FEB 2017 RELEASED -
- 6 -
A7630
DC-DC CONVERTER BOOST (STEP-UP)
1.2MHz, 28V STEP-UP LED DRIVER
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
- FEB 2017 RELEASED -
- 7 -
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