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Qorvo

ACT4533BYH-T Datasheet Preview

ACT4533BYH-T Datasheet

Step-Down DC/DC Converter

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ACT4533A/B
Wide Input Sensorless CC/CV Step-Down
DC/DC Converter
FEATURES
40 V Input Voltage Surge
36 V Steady State Operation
Up to 3.5 A output current
Output Voltage up to 12 V
125 kHz Switching Frequency Eases EMI Design
91% Efficiency (VOUT = 5 V@2.4 A at VIN = 12 V)
Stable with Low-ESR Ceramic Capacitors to Allow
Low-Profile Designs
Integrated Over Voltage Protection
Excellent EMI Performance
Patented ActiveCC Sensorless Constant Current
Control Improves Efficiency and Lowers Cost.
Resistor Programmable
Current Limit from 1.5 A to 4.0 A
Patented Cable Compensation from 0 to 0.25 Ω
±7.5% CC Accuracy
Compensation of Input /Output Voltage Change
Temperature Compensation
Independent of inductance and Inductor DCR
2% Feedback Voltage Accuracy
Advanced Feature Set
Integrated Soft Start
Thermal Shutdown
Secondary Cycle-by-Cycle Current Limit
Protection Against Shorted ISET Pin
SOP-8EP Package
APPLICATIONS
Car Charger/ Adaptor
Rechargeable Portable Device
CV/CC regulation DC/DC converter
GENERAL DESCRIPTION
ACT4533A/B is a wide input voltage, high efficiency
ActiveCC step-down DC/DC converter that operates
in either CV (Constant Output Voltage) mode or
CC (Constant Output Current) mode. ACT4533A/B
provides up to 3.5 A output current at 125 kHz
switching frequency.
ActiveCC is a patented control scheme to achieve high-
accuracy sensorless constant current control. ActiveCC
eliminates the expensive, high accuracy current sense
resistor, making it ideal for CLA applications.
ACT4533A/B integrates adaptive gate drive to
achieve excellent EMI performance passing
EN55022 Class B EMC standard without adding
additional EMI components while maintaining high
conversion efficiency.
Protection features include cycle-by-cycle current limit,
thermal shutdown, and frequency foldback at short cir-
cuit. The devices are available in a SOP-8EP package
and require very few external devices for operation.
The only difference between ACT4533A and
ACT4533B is that Pin 7 provides OVP for ACT4533A
and EN/OVP for ACT4533B.
Data Sheet Rev. 1.0, Sept. 9, 2019 | Subject to change without notice
1 of 18
www.qorvo.com




Qorvo

ACT4533BYH-T Datasheet Preview

ACT4533BYH-T Datasheet

Step-Down DC/DC Converter

No Preview Available !

ORDERING INFORMATION
PART NUMBER
ACT4533AYH-T
ACT4533BYH-T
OPERATION AMBIENT
TEMPERATURE RANGE
-40 °C to 85 °C
-40 °C to 85 °C
PIN CONFIGURATION
ACT4533A/B
Wide Input Sensorless CC/CV Step-Down
DC/DC Converter
OVP/EN PIN PACKAGE PINS PACKING
OVP
OVP/EN
SOP-8EP
SOP-8EP
8
TAPE & REEL
8
TAPE & REEL
PIN DESCRIPTIONS
PIN
NAME
DESCRIPTION
1
HSB
High Side Bias Pin. This provides power to the internal high-side MOSFET gate driver. Connect a
22 nF capacitor from HSB pin to SW pin.
2
IN
Power Supply Input. Bypass this pin with a 10 µF ceramic capacitor to GND, placed as close to the
IC as possible.
3
SW
Power Switching Output to External Inductor.
4
GND
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.
5
FB
Feedback Input. The voltage at this pin is regulated to 0.808 V. Connect to the resistor divider between
output and GND to set the output voltage.
6
COMP Error Amplifier Output. This pin is used to compensate the converter.
ACT4533A: OVP input. If the voltage at this pin exceeds 0.8 V, the IC shuts down high-side switch.
There is a 4 µA pull-up current at this pin.
7
EN/OVP ACT4533B: EN/OVP input. If the voltage at this pin is below 0.65 V, the IC remains shut-off, if the
Voltage at this pin exceeds 2.26 V, the IC shuts down high side switch. There is a 4 µA pull-up current
at this pin.
8
ISET
Output Current Setting Pin. Connect a resistor from ISET to GND to program the output current.
Exposed Pad Heat Dissipation Pad. Connect this exposed pad to large ground copper area with copper and vias.
Data Sheet Rev. 1.0, Sept. 9, 2019 | Subject to change without notice
2 of 18
www.qorvo.com


Part Number ACT4533BYH-T
Description Step-Down DC/DC Converter
Maker Qorvo
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