UM3502QA Datasheet, PDF (2/13 Pages) Union Semiconductor, Inc. – Low-Profile, 600mA, Synchronous Step-Down Converter with Integrated Inductor

Pin Configurations
(Top View)
24 23 22 21 20 19
VOUT 1
VOUT 2
VOUT 3
NC 4
NC(SW) 5
NC(SW) 6
UM3502QA
18 PV_IN
17 PV_IN
16 PV_IN
15 AV_IN
14 NC
13 EN
7 8 9 10 11 12
Top View
UM3502QA
M
M: Month Code
UM3502QA
QFN24 4.0×4.0
Pin Description
Pin Number Symbol
1-3, 24
V_OUT
4, 9, 14
NC
5-8
NC(SW)
10
21-23
11
12
13
15
AGND
PGND
NC(PGND)
FB
EN
AV_IN
16-20
PV_IN
Function
Regulated output voltage. Must be closely placed a 10μF or
greater ceramic capacitor. These pins are connected together
inside the package.
Not connected.
Not connected — These pins are internally connected to the
common switching node of the internal MOSFETs. NC(SW) pins
are not to be electrically connected to any external signal, ground,
or voltage. However, they must be soldered to the PCB.
Analog ground. This is the ground for the internal control
circuitry, and the ground return for external feedback voltage
divider. It must be connected to the quiet point of the ground.
Power ground. Connect this pin to the ground electrode of the
input and output filter capacitors closely.
This pin has been connected with PGND inside the package. No
other connection is needed in use.
Feedback input pin. Connect FB to the center point of the external
resistor divider.
Chip enable control. Drive EN above 1.0V to turn on the part.
Drive EN below 0.4V to turn it off. Do not leave EN floating.
Input power supply for the controller circuitry. Connect to V_IN
at a quiet point. This pin is usually connected to the positive
electrode of C_IN.
Power input for the MOSFET switches. Must be closely
decoupled to GND with a 4.7μF or greater ceramic capacitor.
These pins are connected together inside the package.
Ordering Information
Part Number
UM3502QA
Packaging Type
QFN24 4.0×4.0
Marking Code
3502
Shipping Qty
3000pcs/13Inch
Tape & Reel
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http://www.union-ic.com Rev.01 Nov.2015
2/13