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A8160A Schematic ( PDF Datasheet ) - AiT Semiconductor

Teilenummer A8160A
Beschreibung LED BACKLIGHT DRIVER ASYNCHRONIES BOOST
Hersteller AiT Semiconductor
Logo AiT Semiconductor Logo 




Gesamt 14 Seiten
A8160A Datasheet, Funktion
AiT Semiconductor Inc.
www.ait-ic.com
A8160A
LED BACKLIGHT DRIVER
ASYNCHRONIES BOOST FOR 10WLED DRIVER
DESCRIPTION
FEATURES
The A8160A is a step-up DC-DC converter
specifically designed for driving white LEDs with a
VIN Operating Range : 2.5V to 5.5V
Internal Power N-MOSFET Switch
constant current.
Wide Range for PWM Dimming
The internal MOSFET can support up to 10 White
(100Hz to 200kHz)
LEDs for backlighting and OLED power application, 1.0MHz Switch Frequency
and the internal soft start function can reduce the 300mV Feedback Voltage
inrush current.
1.2A SW Current Limit
The A8160A uses current mode, fixed frequency of Minimize the External Component Counts
approximately 1.0MHz architecture to regulate the Internal Compensation
LED current through an external current sense Over Voltage Protection
resistor. The low feedback voltage of 300mV can Available in SOT-26 Packages
minimize power dissipation.
Other features include current limit protection,
APPLICATION
thermal shutdown protection, under-voltage lockout
(UVLO), and over-voltage function.
Cellular Phones and Digital Cameras
PDAs and Smart Phones and MP3 and OLED
The A8160A is available in SOT-26 packages.
Portable Instruments
LCD Display Power
ORDERING INFORMATION
High-light LED Flash
Package Type
Part Number
SOT-26
A8160AE6R-XX
E6
A8160AE6VR-XX
XX: Output voltage
Note
30 = 3.0V
R: Tape & Reel
V: Halogen free Package
AiT provides all RoHS products
Suffix “ V “ means Halogen free Package
TYPICAL APPLICATION
REV1.1
- JUL 2012 RELEASED, AUG 2012 UPDATED -
-1-






A8160A Datasheet, Funktion
AiT Semiconductor Inc.
www.ait-ic.com
A8160A
LED BACKLIGHT DRIVER
ASYNCHRONIES BOOST FOR 10WLED DRIVER
7. VFB VS ILED
8. Power on from EN
9. LED Backlighting
10. LCD Display Power
11. High-light LED Flash
REV1.1
- JUL 2012 RELEASED, AUG 2012 UPDATED -
-6-

6 Page









A8160A pdf, datenblatt
AiT Semiconductor Inc.
www.ait-ic.com
A8160A
LED BACKLIGHT DRIVER
ASYNCHRONIES BOOST FOR 10WLED DRIVER
PD(MAX)=(TJ(MAX)TA) /θJA
Where TJ(MAX) is the maximum operation junction temperature, TA is the ambient temperature and the θJA is
the junction to ambient thermal resistance.
For the recommended operating conditions specification of A8160A, the maximum junction temperature of the
die is 125°C. The junction to ambient thermal resistance θJA is layout dependent. The junction to ambient
thermal resistance for SOT-26 package is 255°C/W on the standard JEDEC 51-3 single layer thermal test
board. The maximum power dissipation at TA=25°C can be calculated by following formula:
PD(MAX)=(125°C25°C)/(255°C/W)=0.392W
The maximum power dissipation depends on operating ambient temperature for fixed TJ(MAX) and thermal
resistance θJA. For A8160A packages, the Figure 4 of derating curves allows the designer to see the effect or
rising ambient temperature on the maximum power allowed.
Figure 6 Derating Curves for A8160A Packages
Layout Consideration
For best performance of the A8160A, the following guidelines must be strictly followed.
Input and Output capacitors should be placed close to the IC and connected to ground plane to reduce
noise coupling.
The GND and Exposed Pad should be connected to a strong ground plane for heat sinking and noise
protection.
Keep the main current traces as possible as short and wide.
SW node of DC-DC converter is with high frequency voltage swing. It should be kept at a small area.
Place the feedback components as close as possible to the IC and keep away from the noisy devices.
REV1.1
- JUL 2012 RELEASED, AUG 2012 UPDATED -
- 12 -

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