UM3500 Datasheet, PDF (2/11 Pages) List of Unclassifed Manufacturers – 40 Watts DC-DC Converters

UM3500
Ordering Information
Part Number
UM3500
Packaging Type
SOT23-5
Marking Code
LTA5
Shipping Qty
3000pcs/7Inch
Tape & Reel
Pin Description
Pin
Number
1
2
3
4
5
Symbol
Function
RUN
GND
SW
VIN
VFB
Regulator enables control input. Drive RUN above 1.0V to turn on
the part. Drive RUN below 0.4V to turn it off. In shutdown, all
functions are disabled drawing <1μA supply current. Do not leave
RUN floating.
Ground.
Power switch output. It is the switch node connection to Inductor.
This pin connects to the drains of the internal P-CH and N-CH
MOSFET switches.
Supply input pin. Must be closely decoupled to GND, Pin 2, with a
2.2μF or greater ceramic capacitor.
Feedback input pin. Connect FB to the center point of the external
resistor divider. Bonding option
Absolute Maximum Ratings (Note 1)
Symbol
Parameter
Value
Unit
V_IN
Input Voltage
-0.3 to +6.0
V
V_RUN,V_FB RUN, VFB Voltages
+0.3 to V_IN+0.3
V
V_SW,V_OUT SW, VOUT Voltages
+0.3 to V_IN+0.3
V
I_SW
Peak SW Sink and Source Current
1.5
A
T_O
Operating Temperature
-40 to +85
°C
T_STG Storage Temperature Range
-65 to +150
°C
Note 1: Stresses greater than those listed under MAXIMUM RATINGS may cause permanent
damage to the device. This is a stress rating only and functional operation of the device at
these or any other conditions above those indicated in the operational sections of this
specification is not implied. Exposure to absolute maximum rating conditions for
extended periods may affect reliability.
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http://www.union-ic.com Rev.02 Jun.2012
2/11