EN5335QI
Pin Descriptions
PIN
NAME
FUNCTION
NO CONNECT – Do not electrically connect these pins to each other or to
PCB.
1-3
NC
No Connect. These pins are internally connected to the switch node of the
internal MOSFETs. NC(SW) pins are not to be electrically connected to any
external signal, ground, or voltage.
4-6
NC(SW)
7
NC
No connect – Do not electrically connect these pins to each other or to PCB.
Regulated converter output. Connect these pins to the load and place output
capacitor from these pins the PGND pins 17-18
8-14
VOUT
No Connect. These pins are internally connected to the switch node of the
internal MOSFETs. NC(SW) pins are not to be electrically connected to any
external signal, ground, or voltage.
15
NC(SW)
16
NC
No connect – Do not electrically connect these pins to each other or to PCB.
Output power ground. Connect these pins to the ground electrode of the
output filter capacitors. Refer to layout guideline section.
Input power supply. Connect to input power supply. Decouple with input
capacitor to PGND (pins 19-20).
No connect – Do not electrically connect these pins to each other or to PCB.
Optional Over Current Protection adjust pin. Place ROCP resistor between
this pin and AGND (pin 40) to increase the over current trip point by 50%.
Analog voltage input for the controller circuits. Connect this pin to the input
power supply.
17-20
PGND
21-24
25-26
27
PVIN
NC
ROCP
28
AVIN
29
30-31
32
33
34
AGND
NC
VS2
VS1
VS0
Analog ground for the controller circuits.
No connect – Do not electrically connect these pins to each other or to PCB.
Voltage select line 2 input. See Table 1.
Voltage select line 1 input. See Table 1.
Voltage select line 0 input. See Table 1.
Power OK is an open drain transistor for power system state indication. POK
is a logic high when VOUT is with -10% to +20% of VOUT nominal.
Remote voltage sense input. Connect this pin to the load voltage at the point
to be regulated.
Soft-Start node. The soft-start capacitor is connected between this pin and
AGND. The value of this resistor determines the startup timing.
Optional Error Amplifier input. Allows for customization of the control loop.
Optional Error Amplifier output. Allows for customization of the control loop.
Optional Error Amplifier Buffer output. Allows for customization of the control
loop.
35
36
37
POK
VSENSE
SS
38
39
EAIN
EAOUT
40
COMP
Input Enable. Applying a logic high, enables the output and initiates a soft-
start. Applying a logic low disables the output.
No connect – Do not electrically connect these pins to each other or to PCB.
41
ENABLE
NC
42-44
©Enpirion 2009 all rights reserved, E&OE
www.enpirion.com
3
00846
9/18/2009
Rev:C
ENPIRION [ ENPIRION, INC. ]
