ACT4921QI
Rev 1.0, 18-Jan-2018
INTERNAL BUCK REGULATOR
(VIN = 5V, TA = 25°C, unless otherwise specified)
PARAMETER
Operating Input Voltage Range
Typical Output Voltage
CONDITIONS
MIN
TYP
MAX
UNIT
3
28
V
V
V
3.3
Programmable Output Voltage Range
Standby Supply Current
Using external resistor divider
1.8
6
VOUT = 103%, Regulator Enabled, No Load, not switch-
ing
300
450
600
µA
Feedback Voltage
0.8
V
V
Output Voltage Accuracy
VOUT = 3.3V, IOUT = 2A (continuous PWM mode)
-1%
-1%
VNOM
1%
1%
VOUT = 3.3V, IOUT = 1mA (PFM mode) Average Ripple
Output Voltage Accuracy
VNOM
V
Voltage
Line Regulation
Load Regulation
VOUT = 3.3V VIN_B1 = 5.5V to 12V, PWM Regulation
0.02
0.04
%/V
%/A
VOUT = 3.3V PWM Regulation
VOUT Falling
BUCK_UV_TH = 00
BUCK_UV_TH = 01
BUCK_UV_TH = 10
BUCK_UV_TH = 11
60
70
80
90
Undervoltage Threshold
%VNOM
Power Good Threshold (PG_VO)
Power Good Hysteresis (PG_VO)
Overvoltage Fault Threshold
Overvoltage Fault Hysteresis
VOUT Falling
VOUT Rising
VOUT Rising
VOUT Falling
95
2
%VNOM
%VNOM
%VNOM
%VNOM
107
110
3
112.5
562
1125
1500
2250
Programmable Switching Frequency
Range
VOUT > 20% VNOM
kHz
BKILIM_OPT = 0
BKILIM_OPT = 1
3
6
Current Limit, Cycle-by-Cycle Settings
Current Limit, Cycle-by-Cycle Tolerance
A
At default BKILIM_OPT
At other BKILIM_OPT set point
Above BKILIM_OPT threhsold
ISW = -3A, VSTR = 5V
-10
-15
+10
+15
%
%
Current Limit, Shutdown
High Side On-Resistance
Low Side On-Resistance
SW Leakage Current
40
46
32
%
mΩ
mΩ
µA
ISW = 3A, VSTR = 5V
VSTR = 5V, VSW = 0 or 3.3V
1
Innovative PowerTM
ActiveSwitcherTM is a trademark of Active-Semi
www.active-semi.com
Copyright © 2018 Active-Semi, Inc.
10
ACTIVE-SEMI [ ACTIVE-SEMI, INC ]
