AMS1072 AMS [Advanced Monolithic Systems Ltd], AMS1072 Datasheet - Page 3

• Manufacturer Part Number: AMS1072
• Description: 2.5V to 8V Input Voltage Range
• Manufacturer: AMS [Advanced Monolithic Systems Ltd]

ELECTRICAL CHARACTERISTICS
V
PIN FUNCTIONS
Parameters
Enable
EN Threshold
EN Threshold
EN Hysteresis
EN Input Bias Current
Feedback
FB Voltage
FB Input Bias Current
Output Switch
SW On-Resistance
SW Current Limit
Thermal Shutdown
IN
SOT23-6
= V
Pin #
1
2
3
4
5
6
EN
= 5V, T
A
= +25°C, unless otherwise noted.
Name Description
GND
SW
EN
OV
FB
IN
Advanced Monolithic Systems
Power Switch Output. SW is the drain of the internal MOSFET switch. Connect
the power inductor and output rectifier to SW.
Ground.
Feedback Input. The AMS1072 regulates the voltage across the current sense
resistor between FB and GND. Connect a current sense resistor from the bottom
of the LED string to GND. Connect the bottom of the LED string to FB. The
regulation voltage is 104mV.
Regulator On/Off Control Input. A high input at EN turns on the converter, and a
low input turns it off. When not used, connect EN to the input source for automatic
startup. The EN pin cannot be left floating.
Over Voltage Input. OV measures the output voltage for open circuit protection.
Connect OV to the output at the top of the LED string.
Input Supply Pin. Must be locally bypassed.
Symbol Condition
R
ON
V
V
V
V
Duty Cycle = 60%
EN
EN
EN
FB
= 0.1V
Rising, V
Rising, V
= 0V, 5V
(continued)
3
http://www.ams-semitech.com
IN
IN
= 5V
= 2.5V
–600
Min
1.1
0.8
94
AMS1072
–300
1.35
1.33
Typ
104
160
0.5
90
1
Max
114
1.6
Units
mV
µA
mV
nA
°C
Ω
V
V
A