SM8131B Datasheet, PDF (4/21 Pages) Nippon Precision Circuits Inc – The SM8131B is a charge pump DC/DC converter that switches between 1 and 1.5 automatically.

SM8131B
Electrical Characteristics
V_IN = 3.6V, GND = 0V, Ta = 25°C unless otherwise noted
Parameter
Pin Symbol
Condition
Rating
Unit
min
typ
max
Supply voltage range
Standby current
Quiescent current
Output voltage
Maximum output current
Operating frequency
Internal power-ON reset time^*1
VIN
VIN
VIN
VOUT
VOUT
C1M
EN
V_IN0
V_IN
I _STB
I_DD1
I_DD2
V_OUT
I _OUT
f _OSC
T_POR
×1.0 mode, I_OUT = 0mA
×1.5 mode, I_OUT = 120mA
Power-save mode
×1.0 mode, I_OUT = 0mA
×1.5 mode, I_OUT = 0mA
×1.5 mode, I_OUT = 120mA
×1.5 mode
×1.5 mode switching frequency
Time from when power is applied
until internal circuits reset
2.7
3.6
4.6
V
3.3
3.6
4.6
V
–
0.01
1.00
µA
–
0.7
1.5
mA
–
2.0
4.0
mA
4.0
4.2
4.4
V
–
120
–
mA
650
750
850
kHz
–
0.05
1.0
ms
Soft start time
DIN1 to 6 T_SS EN startup → I_LED rising edge
–
1.3
5.0
ms
LED drive pin leakage current DIN1 to 6 I_{leak1 to 6} Power-save mode, DIN pin = 4.2V
–
0.01
1.00
µA
LED drive current
DIN1 to 6 I_{LED1 to 6} ×1.0 mode, RSET = 20kΩ
19.4
20.0
20.6
mA
LED drive current
setting resistance^*1
ISET
RSET RSET maximum value
–
–
50
kΩ
Input signal frequency^*1
EN1/2
f_ENIN
EN input pulse duty 50%,
maximum signal input frequency
–
–
150
kHz
Input pulse width^*1
Hold time
T_ENH Minimum EN pulse HIGH-level width
3.0
–
EN1/2
T_ENL Minimum EN pulse LOW-level width
3.0
–
–
µs
–
µs
EN1/2
T_CEH
Time from when EN1 = EN2 = LOW
until LED drive circuit shutdown
1.17
1.37
1.63
ms
Input voltage
Input current
EN1/2,
SEL1/2
EN1/2
V_IH HIGH-level input voltage range
V_IL LOW-level input voltage range
I_IH Pull-down pin, EN pin = 3.6V
1.8
–
–
V
–
–
0.6
V
–
5.0
10.0
µA
*1. Design guaranteed value
NIPPON PRECISION CIRCUITS INC.—4