EN5337QI
Ordering Information
Pin Assignments (Top View)
Temp Rating
38
37
34
33
36
35
32
31
30
28
26
29
27
Part Number
EN5337QI-T
EN5337QI-E
(°C)
-40 to +85
Package
38-pin QFN T&R
QFN Evaluation Board
NC(SW)
NC(SW)
NC
1
2
3
25
NC
24
23
NC
NC
EN5337QI
NC
4
22
21
NC
VOUT
VOUT
5
6
PVIN
20 PVIN
15
16
7
8
11
12
13
14
17
18
19
9
10
Figure 3: Pinout Diagram (Top View)
NOTE: All perimeter pins must be soldered to PCB.
Pin Description
PIN
NAME
FUNCTION
NO CONNECT – These pins are internally connected to the common switching node of the
internal MOSFETs. They are not to be electrically connected to any external signal, ground,
or voltage. Failure to follow this guideline may result in damage to the device.
NO CONNECT – These pins may be internally connected. Do not connect them to each
other or to any other electrical signal. Failure to follow this guideline may result in device
damage.
1-2, 12,
34-38
NC(SW)
3-4,
22-25
NC
Regulated converter output. Connect these pins to the load, and place output capacitor
from these pins and PGND pins 13-15
Input/Output power ground. Connect these pins to the ground electrode of the Input and
output filter capacitors. See VOUT and PVIN pin descriptions for more details.
Input power supply. Connect to input power supply. Decouple with input capacitor to
PGND pins 16-18.
External Clock Input to synchronize internal switching clock to an external signal
Input Enable. Applying logic high enables the output and initiates a soft-start. Applying a
logic low disables the output.
5-11
VOUT
PGND
13-18
19-21
26
PVIN
SYNC
27
ENABLE
Power OK is an open drain transistor for power system state indication. POK will be logic
high when VOUT is with -10% to +20% of VOUT nominal.
Optional Error Amplifier output. Allows for customization of the control loop response.
Soft-Start node. The soft-start capacitor is connected between this pin and AGND. The
value of this capacitor determines the startup time.
28
29
30
POK
EAOUT
SS
External Feedback Input. The feedback loop is closed through this pin. A voltage divider at
VOUT is used to set the output voltage. The mid point of the divider is connected to XFB. A
phase lead capacitor from this pin to VOUT is also required to stabilize the loop.
Analog Ground. This is the Ground return for the controller. Needs to be connected to a
quiet ground.
31
XFB
32
33
AGND
AVIN
Input power supply for the controller. Needs to be connected to input voltage at a quiet
point.
©Enpirion 2009 all rights reserved, E&OE
2
www.enpirion.com
02638
6/18/2009
Rev:D
ENPIRION [ ENPIRION, INC. ]
