SM74203 Datasheet, PDF (3/24 Pages) Texas Instruments – SM74203 60V Low Side Controller for Boost and SEPIC

Connection Diagram
30159353
10-Lead MSOP
NS Package Number MUB10A
Ordering Information
Part Number
SM74203MM
SM74203MMX
SM74203MME
Pin Descriptions
NS Package Drawing
MUB10A
MUB10A
MUB10A
Supplied As
1000 Units on Tape and Reel
3500 Units on Tape and Reel
250 Units on Tape and Reel
Pin(s)
1
2
3
4
5
6
7
8
9
10
Name
VIN
FB
COMP
VCC
OUT
GND
UVLO
CS
RT/SYNC
SS
Description
Application Information
Source input voltage
Input to the start-up regulator. Operates from 6V to 60V.
Feedback pin
Inverting input to the internal voltage error amplifier. The non-
inverting input of the error amplifier connects to a 1.25V
reference.
Error amplifier output and PWM
comparator input
The control loop compensation components connect between
this pin and the FB pin.
Output of the internal, high voltage linear This pin should be bypassed to the GND pin with a ceramic
regulator.
capacitor.
Output of MOSFET gate driver
Connect this pin to the gate of the external MOSFET. The gate
driver has a 1A peak current capability.
System ground
Input Under-Voltage Lock-out
Set the start-up and shutdown levels by connecting this pin to the
input voltage through a resistor divider. A 20 µA current source
provides hysteresis.
Current Sense input
Input for the switch current used for current mode control and for
current limiting.
Oscillator frequency adjust pin and
synchronization input
An external resistor connected from this pin to GND sets the
oscillator frequency. This pin can also accept an AC-coupled
input for synchronization from an external clock.
Soft-start pin
An external capacitor placed from this pin to ground will be
charged by a 10 µA current source, creating a ramp voltage to
control the regulator start-up.
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