User Guide

WE866C6 Hardware Design Guide
1VV0301658 Rev. 1 Page 36 of 58 2020-06-16
7.3.2. Regulator Operating Conditions
Below table shows the recommended operating conditions of the VDD_3.3V Buck-Boost
voltage regulator:
Parameter
Condition
Min
Type
Max
Unit
Input Voltage range
2.5
4.75
V
Shutdown supply current
1
5
µA
Quiescent current
IOUT=0mA, VOUT=3.3V
30
60
µA
Output voltage
3.3
V
Load Current
0.9
A
Output Voltage accuracy
(output voltage should be
maintained within these
limits during all conditions
including line voltage, load
current variations)
PWM mode
-2
2
2
%
PFM mode
-4
4
4
%
Output ripple voltage
PWM mode
20
mVpp
PFM mode
50
mVpp
Power efficiency
Vout=3.3V, Iout=1300mA
85
90
%
Vout=3.3V, Iout=1mA
80
85
%
Overshoot/Undershoot
IOUT = 0.2A to 1.2A
IOUT = 1.2A to 0.2A
100
mV
Startup time
Buck mode, time taken for
VOUT to reach 95% of its
nominal value. VIN=4V,
IOUT=200mA
1
mS
Boost mode, time taken for
VOUT to reach 95% of its
nominal value. VIN=3V,
IOUT=200mA
2
mS
Switching frequency
1.5
6
MHz
PFM mode
Output current to enter
PFM mode
100
mA
Short circuit current limit
2.5
A