User Manual
BM23SPKA1NB9
Version: 0.94 - 14 - 22/9/2014
ADAP_IN
4.5V
7.0V
LED
4.3V
Power switch
1.8V
7.0V
Table 3: BUCK switching regulator
Normal Operation
Min
Typ
Max
Unit
Operation Temperature
-40
85
℃
Input Voltage (V
IN
)
3.0
3.8
4.5
V
Output Voltage (V
OUT
)
(I
LOAD
=70mA, V
IN
=4V)
1.7
1.80
2.05
V
Output Voltage Accuracy
±5
%
Output Voltage Adjustable Step
50
mV/Step
Output Adjustment Range
-0.1
+0.25
V
Output Ripple
10
15
mV
RMS
Average Load Current (I
LOAD
)
120
mA
Settling Time
(start-up time)
EN or V
IN
to V
OUT
1.2
2
ms
Conversion
efficiency
@BAT=3.8V
I
LOAD
= 50mA
88
%
I
LOAD
≥ 10mA (PWM)
70
I
LOAD
≥ 10mA (PFM)
80
I
LOAD
≥ 250μA
(PFM)
65
70
Switching Frequency
800
KHz
PWM/PFM Switching Point
by F/W
mA
Start-up Current Limit
0
50
210
mA
Start-up Inrush
Current
I
LOAD
= 10mA
400
mA
Quiescent Current
PWM
1000
μA
PFM
30
40
Output Current (Peak)
200
mA
Load Regulation (I
LOAD
= 10 ~ 100mA)
1
mV/mA
Line Regulation (3.2V < V
IN
< 4.2V)
0.03
%/V