AMS4122
PIN DESCRIPTION
Pin Number
1
2
3
4
NAME
SW2
PVIN SW2
GND
F/B2
DESCRIPTION
This connects the inductor the Internal Switch2
Input Power Pin for SW2 from unregulated power supply
Ground Pin connected to PCB ground plane. This pin is also the ground for internal
voltage reference.
Feedback2. A resistor network of two resistors is used to set-up the output voltage
connected between Output2 to GND. The node between the two resistors is connected to
Feedback2 pin. In Two Phase Mode F/B2 should be connected to a voltage 2.5V or
higher
Feedback1. A resistor network of two resistors is used to set-up the output voltage
connected between Output1 to GND. The node between the two resistors is connected to
Feedback1 pin.
Enable. A voltage greater than 2.5V at this pin enables both devices operation.
Input Power Pin for SW1 and Analog Input Voltage that powers up the chip
This connects the inductor the Internal Switch1
5
F/B1
6
7
8
EN
PVIN SW1/AVIN
SW1
RECOMMANDED OPERATING CONDITIONS:
The minimum input voltage should be 4.5V, however the device will
function as low as 4.0V. The maximum operating voltage should be 16V, the device will work at 17V but the switching loss is
higher. The best performance is at 1.5A output load per channel; however it works well with 2A load per channel. The minimum
supply voltage is Vout +1Vfor 1A load and Vout +1.1V for 2A load but higher than 4.0V. There is an internal UVLO that will
turn off the device if the input voltage is below 4.0V. When the input voltage exceeds 12V the output load current should be
maintain below 1.5A, due to switching loss the device will have lower performance.
Advanced Monolithic Systems, Inc.
www.advanced-monolithic.com
Phone (925) 443-0722
Fax (925) 443-0723
ADMOS [ ADVANCED MONOLITHIC SYSTEMS ]
