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ADT7110 (ADTech) : Total 8 Pages

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ADT7110
General Description
The ADT7110 is a fixed frequency step-down
converter designed to drive Infrared LEDs in the
CCD camera module application.
And internal current limit circuit protect external
devices.
654
A11
123
Package outline of the ADT7110
Features
Applications
• Input voltage range : 10.5V to 15V
• Infrared LED driver for CCD camera
• Current mode PWM controller with
integrated compensation components
• 350mA output load current available
• Built-in chip enable/disable function
• Built-in current limit protection
• 500kHz fixed frequency internal oscillator
• Small outline SOT-26 package (2.9mm x 1.6mm body)
Typical Application Circuit
VOUT
RSE
RFB1a
RFB1b
RFB1c
RFB1d
RFB1e
RFB1f
RFB2
L1
C1
U1
RS
GND
PWM
VIN
EN
FB
VIN
C2
EN
VFB
* This specifications are subject to be changed without notice
Jun. 07. 2008 / Rev. 0.1
1/8 http://www.ad-tech.co.kr
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ADT7110
Part List
Component
U1*1
L1
C1
C2
RSE
RLED1 ~ RLED6*2
RFB1a ~ RFB1f
RFB2*3
Description
Composite type with a PNP transistor
and schottky barrier diode
Output filter inductor
Output filter capacitor
Bypass capacitor
Current sense resistor
LED current ballast resistor
Buck converter feedback loop
component
Buck converter feedback loop
component
Type
IC
Chip inductor
Tantalum capacitor
Tantalum capacitor
Chip resistor
Chip resistor , 1%
Chip resistor
Chip resistor , 1%
Value
FP103
47uH/590mA
47uF/16V
10uF/25V
0.1
4.0
120(table 3)
68(table 2)
*1 : For cost down , it is possible to use discrete component with a PNP transistor and a schottky barrier diode.
In this case, you make use the discrete components with proper electrical specification.
Table A shows the required key electrical limits. It is recommended to use PNP and schottky barrier diode
having equivalent specification in the Table A.
*2, *3 : To setting appropriate LED current, Refer to ‘Application Hints’.
Table A : Selection guide for the discrete components
Component
Parameter
Ratings
Collector to Emitter Voltage
PNP
Collector Current
-23
-2
Schottky
Barrier Diode
Repetitive Peak Reverse Voltage
Average Rectified Current
30
700
Unit Remarks
V Recommend
A ‘2SB1706’ by ROHM or Equivalent IC
V Recommend
mA ‘RSX101M-30’ by ROHM or Equivalent
* This specifications are subject to be changed without notice
Jun. 07. 2008 / Rev. 0.1
2/8 http://www.ad-tech.co.kr
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Pin Configuration
16
25
34
ADT7110
Pin Description
Pin No. Name I/O Type
Description
1 RS I A Current sense and provide voltage feed-forward.
2
GND
- G Ground
3 PWM O D Switching output.
4 FB I A Feedback voltage input
5 EN I D Device enable pin
6 VIN - P Power supply input
I : Input pin O : Output pin IO : Input/Output pin
P : Power pin G : Ground pin
A : Analog pin D : Digital pin
Functional Block Diagram
EN
GND
FB
Internal
REG.
BIAS
OSC
Set
Error
Amplifier
REF
+
gm
-
Current
Sense
-
+
PWM
Comparator
-
+
Set
Current
Limit
-
+
Control
Logic
Driver
VIN
RS
SW
* This specifications are subject to be changed without notice
Jun. 07. 2008 / Rev. 0.1
3/8 http://www.ad-tech.co.kr
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ADT7110
Absolute Maximum Ratings
Parameter
Symbol
Min.
Typ.
Max.
Unit
Power supply voltage
VIN -
- 23 V
Power dissipation (Ta=70) (Note1)
PDmax
-
- 265
Storage temperature
TSTG
-65
-
+150
Junction temperature
TJmax
-
-
+150
Thermal resistance
ΘJA - 301.2 - /W
Note1. derate 301/W above +70.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device.
These are stress ratings only, and functional operation of the device at these or any other conditions beyond those
indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect device reliability.
Operating Ratings
Parameter
Symbol
Min.
Typ.
Max.
Unit
Power supply voltage*2
VIN 10.5
12.0 15.0 V
Operating temperature
TOPR
-20
- +85
Junction temperature
Max. power dissipation (Ta=70)*1
TJ
PD
-
-
-
+125
- 180
*1 This spec. indicates that junction temperature of the device is under 125. In specific applications ,
this is recommended under this power dissipation specification.
*2 Minimum VIN operating range is dependant to the VOUT voltage. ( VIN min. VOUT + 0.5V)
Maximum VIN operating range can be extended. In this case, maximum drive current is limited.
For using VIN over 15V, refer to the Table B.
Table B : Maximum drive current as maximum VIN operating voltage.
VIN (V)
16 17 18 19 20 21 22
Drive current ()
330 310 290 270 250 230 210
Electrical Characteristics (Ta=25, VIN=12V, unless otherwise noted)
Parameter
Condition
MIN TYP MAX Unit Note
Supply current, operating
Supply current, disable
V(EN) = 3.3V , IO=300
V(EN) = 0V
- 6 9
- 90 200
V(EN), input voltage high
-
2.4 -
-V
V(EN), input voltage low
-
- - 1.2 V
PWM controller
Output drive current
VIN 15V
-
300 350
Current limit
-
550 -
-
Efficiency
Oscillator frequency
Feedback voltage (VFB)
IO=300
- 85
IO=300
350 500
* This sIpOe=c3i0fi0cations are subject to be changed2w.1i6thout n2.o2t1ice
-
625
2.26
%
V
Jun. 07. 2008 / Rev. 0.1
4/8 http://www.ad-tech.co.kr
www.DataSheet.in






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