MC34280 Datasheet, PDF (7/20 Pages) ON Semiconductor – Power Supply & Management IC for Handheld Electronic Products

MC34280
DYNAMIC ELECTRICAL CHARACTERISTICS (Refer to TIMING DIAGRAMS, TA = 0 to 70°C unless otherwise noted.)
Rating
Symbol
Min
Typ
Max
Unit
Minimum PORB to Control delay
Minimum VAUXCON pulse HIGH width
Minimum VAUXCON pulse LOW width
Minimum VAUXADJ to VAUXCON delay
Minimum VAUXADJ pulse HIGH width
Minimum VAUXADJ pulse LOW width
Minimum VAUXCON LOW to VAUXADJ pulse delay1
Minimum hold time of VAUXADJ for Reset VAUXREF
Minimum VAUXADJ pulse HIGH width for Reset VAUXREF
Minimum hold time of VAUXADJ for Decrement VAUXREF
Minimum VAUXADJ pulse HIGH width for Decrement VAUXREF
tPORC
tCW
tCC
tCL
tJW
tJC
tJL
tRJL
tRW
tDL
tDW
500
nS
5.0
µS
8.0
µS
1.0
µS
1.0
µS
1.0
µS
1.0
µS
500
nS
1.0
µS
500
nS
1.0
µS
NOTE: 1. For not resetting VAUXREF.
TYPICAL ELECTRICAL CHARACTERISTICS
Figure 6. Efficiency of VMAIN versus Output
Current (VMAIN = 3.3 V, L = 33 uH, Various VIN)
90%
Figure 7. Efficiency of VMAIN versus Input
Voltage (VMAIN = 3.3 V, L1 = 33 uH, Various IOUT)
90%
85%
80%
75%
70%
0
Vin = 3V
Vin = 1.8V
Vin = 1.5V
Vin = 1V
50
100
150
200
250
300
IOUT_MAIN, MAIN OUTPUT CURRENT (mA)
85%
80%
75%
70%
1
X
X
Iout = 10mA
X
Iout = 60mA
Iout = 100mA
Iout = 150mA
X Iout = 200mA
1.5
2
2.5
3
VIN, INPUT VOLTAGE (V)
Figure 8. Efficiency of VAUX versus Output
Current (VAUX = 25 V, L2 = 33 uH, Various VIN)
80%
75%
70%
65%
60%
55%
50%
1
Vin = 3V
Vin = 1.8V
Vin = 1.5V
Vin = 1V
3
5
7
9
11
13
15
IOUT_AUX, AUX OUTPUT CURRENT (mA)
Figure 9. Efficiency of VAUX versus Input
Voltage (VAUX = 25 V, L2 = 33 uH, Various IOUT)
80%
75%
70%
65%
60%
55%
50%
1
Iout = 1mA
Iout = 5mA
Iout = 10mA
Iout = 15mA
1.5
2
2.5
3
VIN, INPUT VOLTAGE (V)
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