ACT4910QW
Rev 1.0, 15-Sept-2017
PIN DESCRIPTIONS
PIN
NAME
DESCRIPTION
High Side Bias, Boot-strap pin. This provides power to the internal high-side
MOSFET gate driver circuitry. Connect a 47nF capacitor from HSB pin to SW pin
1
HSB
Power Loss Indicator Open-Drain Output. PLI goes low to indicate loss of input
power. Can also be configured as a storage voltage monitor or an output voltage
monitor. PLI is referenced to VSS.
2
PLI
3, 28
4
PGND
BSET
Power Ground. Connect to large ground plane on PCB
Sets the storage capacitor voltage. Place a resistor from BSET to VSS to set the
desired voltage.
5
6
REF
COMP
FB
Internal Bias Voltage Output. Connect a 1µF capacitor between REF and VSS.
Compensation input pin for the buck converter.
7
Output Voltage Feedback. Kelvin connect FB to the output capacitor.
Analog Ground. Kelvin connect VSS to the PGND plane.
I2C Clock Input. Needs an external pull up resistor.
8
VSS
SCL
SDA
9
10
I2C Data Input and Output. Needs an external pull up resistor.
11,12,13,2
3, 24, 25
Output for by-pass mode, in-rush, and eFuse functionality. Connect VOUT to the
system load.
VOUT
nIRQ
ISET
SS
Interrupt Open-Drain Output. nIRQ goes low to indicate a fault condition. nIRQ is
referenced to VSS.
14
15
16
Input and Output Current Limit pin. ISET can also indicate the load current through
the eFuse. Connect a resistor from ISET to VSS to set the current limit.
Soft Start Input. Place a capacitor from SS to VSS to control the eFuse startup
voltage slew rate.
Enable Input. A dual comparator on EN measures the input voltage to determine if
it is under, voltage, over voltage, or within normal operating limits. Connect a
resistive voltage divider between VIN, EN, and VSS to set the EN_UV and EN_UV
thresholds. The EN_UV threshold is 0.64V. The EN_OV threshold is typically
0.92V, but can be modified by the IC’s CMI.
17
EN
18,19, 20,
21, 22
Power Supply Input. Input to the eFuse. Connect a 0.1µF capacitor between VIN
and PGND as close to the IC as possible.
VIN
STR
SW
Storage Capacitor Input. Connect the storage capacitors to STR. STR requires a
minimum capacitor of 100µF to PGND.
26
27
Switching Pin. This is the boost converter switch node and the buck converter
switch node. Connect the inductor to SW.
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5
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