Philips VES1.1E - 17.2 Pinning; RTA8283 A (U23, U173); 18.1 General description; 18.2 Features

17.2 Pinning
Pin
#
Name
Description
1
FB
Feedback input. An external resistor divider from
the output to GND, tapped to the FB pin sets the
output voltage.
2
GND,
Exposed
Pad
Ground pin. Connect exposed pad to ground
plane for proper thermal performance.
3
SW
Switch node to the inductor.
4
PVIN
Input supply pin for power FET.
5
VIN
Input Supply pin for controller. Put small
decoupling ceramic near this pin.
6
EN
Enable input, “High” enables MP2012. EN is
pulled to GND with 1Meg internal resistor.
18 RTA8283A (U23, U173)
18.1 General description
The RT8283A is a high-efficiency, monolithic synchronous step-down DC/DC converter
that can deliver up to 3A output current from a 4.5V to 23V input supply. The RT8283A's
current mode architecture and external compensation allow the transient response to be
optimized over a wide range of loads and output capacitors. Cycle-by-cycle current limit
provides protection against shorted outputs and soft-start eliminates input current surge
during start-up. The RT8283A also provides output under voltage protection and thermal
shutdown protection. The low current (<3μA) shutdown mode provides output
disconnect,
enabling easy power management in batterypowered systems. The RT8283A is available
in a SOP-8 package.
18.2 Features
• ±1.5% High Accuracy Feedback Voltage
• Integrated N-MOSFET Switches
• Current Mode Control
• Fixed Frequency Operation : 340kHz
• Output Adjustable from 0.8V to 20V
• Up to 95% Efficiency
• Thermal Shutdown Protection