UM3500_16 Datasheet, PDF (2/11 Pages) Union Semiconductor, Inc. – 600mA, 1.5MHz, Synchronous Step-Down DC-DC Converter

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
V_IN
V_RUN,V_FB
V_SW,V_OUT
I_SW
T_O
T_STG
Parameter
Input Voltage
RUN, VFB Voltages
SW, VOUT Voltages
Peak SW Sink and Source Current
Operating Temperature
Storage Temperature Range
Value
Unit
-0.3 to +6.0
V
+0.3 to V_IN+0.3
V
+0.3 to V_IN+0.3
V
1.5
A
-40 to +85
°C
-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.04 May.2016
2/11