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ADT7350 (ADTech) : Total 9 Pages

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General Description
The ADT7350 is a step-down converter with
integrated switching MOSFET. It operates wide
input supply voltage range from 4.5V to 24V with
1.2A peak output current. It includes current
limiting protection and thermal shutdown.
It reduces design complexity and external
component count. The ADT7350 is available in
small outline SOT23-6L package.
Features
• Current mode buck regulator with 1.4MHz
fixed frequency
• Input voltage range : 4.5V to 24V
• Adjustable output range : 0.81V to 15V
• Max. output current : 1.2A
• Up to 92% Efficiency
• Internal Soft-Start Function
• Integrated Power MOSFET switch : 400m
• Thermal shutdown & current limit protection
• SOT23-6L package
Typical Application Circuit
ADT7350
Package outline of the ADT7350
Applications
• Distributed Power Systems
• Surveillance Camera module
• Navigation
• Infra-Red LED Drivers
1
BST
SW 6
U1
2
GND
5
VIN
3
FB
4
EN
CB
L1
D1 C2
VIN
C1
EN
VOUT
R1
R2
* This specifications are subject to be changed without notice
Sep. 9. 2010 / Rev. 0.0
1/9 http://www.ad-tech.co.kr
www.DataSheet.in



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Part List
Component
U1
D1
L1
C2
C1
CB
R1
R2
Type
IC
Schottky barrier diode
Chip inductor
MLCC
MLCC
MLCC
Chip resistor
Chip resistor
ADT7350
Value (Model)
ADT7350
RSX101M-30
4.7uH / 1.6A
22/ 16V
10/ 50V
10
49.9/ 1%
16.2/ 1%
Manufacturer
ADTech
ROHM
TDK
-
-
-
-
-
R1,R2 : VOUT 3.3V typical case
Pin Description
Pin
No.
Name
Pin Description
Bootstrap. This pin acts as the power supply for internal Power Transistor driver.
1 BST
Connect a 10nF capacitor between this pin and SW pin.
2 GND Ground and heat sink. Connect this pin to a large copper PCB area.
3
FB
Feedback voltage input. The voltage of this pin is regulated to 0.81V. The shielding in the
PCB layout is option and connect resistor divider as close as possible.
4
EN
Chip enable input. The Enable voltage range is higher than 1.2V and disable voltage is
lower than 0.4V.
5 VIN Power supply input. The input bypass capacitor should be as close as GND pin.
6 SW Switching node. The free-wheeling diode is connected between this pin and GND.
BST 1
GND 2
FB 4 3
6 SW
5 VIN
4 4 EN
* This specifications are subject to be changed without notice
Sep. 9. 2010 / Rev. 0.0
2/9 http://www.ad-tech.co.kr
www.DataSheet.in



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ADT7350
Functional Block Diagram
EN 4
Shutdown
Internal
Regulator
Voltage
Reference
OSC
VIN
5
Current
sense
-
+
Regulator
Σ
RS
1 BST
FB 3
ZFB
+
-
Error
Amp
Current
Limit
+
Control
LOGIC
-
Comparator
2
GND
Driver
6 SW
Absolute Maximum Ratings (Note1)
Parameter
Symbol
Min.
Typ.
Max. Unit
Power supply voltage
VIN -
- 26 V
SW pin voltage
VSW
-
- 27 V
BST pin voltage
VBST
-
- VSW + 6V V
All Other Pins
- -0.3 -
+6 V
Max. power dissipation (Ta=25) (Note2)
Thermal resistance (Note3)
Storage temperature
PD
ΘJA
TSTG
-
-
-65
- 400 mW
250 - /W
-
+150
Junction temperature
TJmax
-
-
+150
Note1. Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device.
Note2. derate 4.0mW/above +25. This is recommended to operate under this power dissipation specification.
Note3. Measured on JESD51-7, 4-layer PCB
Operating Ratings
Parameter
Power supply voltage
Output voltage
Operating temperature
Junction temperature
Symbol
VIN
VOUT
TOPR
TJ
Min.
4.5
0.81
-40
-
Typ.
12.0
-
-
-
Max.
24.0
15
+85
+125
Unit
V
V
* This specifications are subject to be changed without notice
Sep. 9. 2010 / Rev. 0.0
3/9 http://www.ad-tech.co.kr
www.DataSheet.in



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ADT7350
Electrical Characteristics (Ta=25, VIN=12V, unless otherwise noted)
Parameters
Supply current (shutdown)
Supply current (quiescent)
Feedback voltage (VFB)
Feedback current (IFB)
Switch On Resistance (RDS.ON), (Note5)
Switch Leakage
Current Limit (Note5)
Oscillator frequency (FSW)
Fold-back frequency
Maximum Duty cycle
UVLO rising threshold
UVLO threshold hysteresis
EN input low voltage
EN input high voltage
EN input current
Thermal shutdown (Note5)
Condition
VEN = 0V
VEN = 2V, VFB = 1V
4.5V VIN 24V
VFB = 0.81V
-
VEN = 0V , VSW = 0V
-
VFB = 0.81V
VFB = 0V
VFB = 0.81V
-
-
-
-
VEN = 2V
VEN = 0V
-
Min.
-
-
0.79
-
-
-
-
1.2
-
-
3.8
-
-
1.2
-
-
-
Typ.
0.2
-
0.81
0.1
0.4
-
1.8
1.4
460
85
4
250
-
-
5
0.1
140
Max.
-
1
0.83
-
-
30
-
1.7
-
-
4.2
-
0.4
-
-
-
-
Unit
V
A
%
V
V
V
Note5. guaranteed by design.
Note
* This specifications are subject to be changed without notice
Sep. 9. 2010 / Rev. 0.0
4/9 http://www.ad-tech.co.kr
www.DataSheet.in






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