ACT4533A/B
Rev 0, 14-Aug-13
ORDERING INFORMATION
OPERATION AMBIENT
TEMPERATURE RANGE
OVP/EN
PIN
PART NUMBER
PACKAGE
PINS
PACKING
ACT4533AYH-T
ACT4533BYH-T
-40°C to 85°C
OVP
SOP-8EP
SOP-8EP
8
8
TAPE & REEL
TAPE & REEL
-40°C to 85°C
OVP/EN
PIN CONFIGURATION
PIN DESCRIPTIONS
PIN
NAME
DESCRIPTION
High Side Bias Pin. This provides power to the internal high-side MOSFET gate driver.
Connect a 22nF capacitor from HSB pin to SW pin.
1
HSB
Power Supply Input. Bypass this pin with a 10µF ceramic capacitor to GND, placed as
close to the IC as possible.
2
3
IN
SW
Power Switching Output to External Inductor.
Ground. Connect this pin to a large PCB copper area for best heat dissipation. Return
FB, COMP, and ISET to this GND, and connect this GND to power GND at a single
point for best noise immunity.
4
GND
Feedback Input. The voltage at this pin is regulated to 0.808V. Connect to the resistor
divider between output and GND to set the output voltage.
5
6
FB
COMP
Error Amplifier Output. This pin is used to compensate the converter.
ACT4533A:OVP input. If the voltage at this pin exceeds 0.8V, the IC shuts down high-
side switch. There is a 4µA pull-up current at this pin.
7
8
EN/OVP
ACT4533B: EN/OVP input. If the voltage at this pin is below 0.65V, the IC remains
shut-off; if the Voltage at this pin exceeds 2.26V, the IC shuts down high side switch.
There is a 4µA pull-up current at this pin.
Output Current Setting Pin. Connect a resistor from ISET to GND to program the
output current.
ISET
Heat Dissipation Pad. Connect this exposed pad to large ground copper area with
copper and vias.
Exposed Pad
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