AMS1069 AMS [Advanced Monolithic Systems Ltd], AMS1069 Datasheet - Page 3

• Manufacturer Part Number: AMS1069
• Description: 2A Output Current
• Manufacturer: AMS [Advanced Monolithic Systems Ltd]

ELECTRICAL CHARACTERISTICS
V
PIN FUNCTIONS
Parameter
Input Under Voltage Lockout
Threshold
Input Under Voltage Lockout
Threshold Hysteresis
Soft-Start Current
Soft-Start Period
Thermal Shutdown
Pin #
IN
1
2
3
4
5
6
7
8
= 12V, T
COMP
Name
GND
SW
BS
FB
EN
SS
IN
A
= +25°C, unless otherwise noted.
Description
High-Side Gate Drive Boost Input. BS supplies the drive for the high-side N-Channel MOSFET
switch. Connect a 10nF or greater capacitor from SW to BS to power the high side switch.
Power Input. IN supplies the power to the IC, as well as the step-down converter switches.
Drive IN with a 4.75V to 18V power source. Bypass IN to GND with a suitably large capacitor
to eliminate noise on the input to the IC.
Power Switching Output. SW is the switching node that supplies power to the output. Connect
the output LC filter from SW to the output load. Note that a capacitor is required from SW to
BS to power the high-side switch.
Ground.
Feedback Input. FB senses the output voltage to regulate that voltage. Drive FB with a
resistive voltage divider from the output voltage. The feedback threshold is 0.905V.
Compensation Node. COMP is used to compensate the regulation control loop. Connect a
series RC network from COMP to GND to compensate the regulation control loop. In some
cases, an additional capacitor from COMP to GND is required.
Enable Input. EN is a digital input that turns the regulator on or off. Drive EN high to turn on
the regulator, drive it low to turn it off. Pull up with 100kΩ resistor for automatic startup.
Soft-Start Control Input. SS controls the soft start period. Connect a capacitor from SS to GND
to set the soft-start period. A 0.1µF capacitor sets the soft-start period to 15ms. To disable the
soft-start feature, leave SS unconnected.
Advanced Monolithic Systems
Symbol Condition
V
V
C
IN
SS
SS
(continued)
Rising
= 0V
= 0.1µF
3
http://www.ams-semitech.com
Min
4.30
Typ
210
160
AMS1069
15
6
Max
Units
mV
ms
µA
°C
V