LT1942(RevA) Ver la hoja de datos (PDF) - Linear Technology
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LT1942 Datasheet PDF : 16 Pages
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LT1942
ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 3.3V, VSHDN = VIN, unless otherwise noted. (Note 2)
PARAMETER
CONDITIONS
MIN TYP MAX
UNITS
LED1-LED2 Current Matching
LED1 Voltage
LED2 Voltage
LED1, LED2 Maximum Current
LED1, LED2 Leakage Current
AVDD Maximum Duty Cycle
VOFF Maximum Duty Cycle
VON Maximum Duty Cycle
LED Maximum Duty Cycle
Current Into Each Pin = 20mA, VLED1 = VLED2
Current Into Each Pin = 20mA, |VLED1-VLED2| = 1V
0
1.5
%
1
2.5
%
20mA Into Pin, VLED2 = 2V, FB4 = 0
1
1.2
V
20mA Into Pin, VLED1 = 2V, FB4 = 0
1
1.2
V
Into Either Pin, VLEDX < 1.5V, FB4 = 0
35
mA
VSHDN = 0V, VLEDX = 45V
●
1
µA
SW1 Pin
88
93
%
SW2 Pin
75
86
%
SW3 Pin
75
86
%
SW4 Pin
88
93
%
AVDD Switch Current Limit at Minimum DC (SW1)
AVDD Switch Current Limit at Maximum DC (SW1)
VOFF Switch Current Limit at Minimum DC (SW2)
VOFF Switch Current Limit at Maximum DC (SW2)
VON Switch Current Limit at Minimum DC (SW3)
VON Switch Current Limit at Maximum DC (SW3)
LED Switch Current Limit at Minimum DC (SW4)
SW1 Pin (Note 4)
SW1 Pin (Note 4)
SW2 Pin (Note 4)
SW2 Pin (Note 4)
SW3 Pin (Note 4)
SW3 Pin (Note 4)
SW4 Pin (Note 4)
150 200 250
mA
80
140 200
mA
50
80
110
mA
30
60
90
mA
50
80
110
mA
30
60
90
mA
550 750 900
mA
LED Switch Current Limit at Maximum DC (SW4)
SW4 Pin (Note 4)
450 600 850
mA
VOFF Schottky Diode Forward Drop
VOFF Schottky Diode Leakage Current
VON Schottky Diode Forward Drop
VON Schottky Diode Leakage Current
LED Schottky Diode Forward Drop
D2 Pin, I = 60mA
D2 Pin, VD2 = –36V
●
D3 Pin, I = 60mA
VD3 = 36V, SW3 = 0V, Output Disconnect PNP Off ●
I = 250mA
0.65
V
1
µA
0.65
V
1
µA
0.75
V
LED Schottky Diode Leakage Current
Switching Frequency
VD4 = 36V, SW4 = 0V
●
1
µA
0.8
1
1.2
MHz
SHDN Pin Current
CTRL4 Pin Current
SW1-SW4 leakage Current
SW1 VCESAT
SW2 VCESAT
SW3 VCESAT
SW4 VCESAT
SS1 Charging Current
SS4 Charging Current
SHDN Input Voltage High
VSHDN = 3V
VSHDN = 0V
VCTRL4 = 3V
VCTRL4 = 0V
VSWX = 36V
ISW1 = 100mA (Note 5)
ISW2 = 40mA (Note 5)
ISW3 = 40mA (Note 5)
ISW4 = 400mA (Note 5)
VSS = 0.5V
VSS = 0.5V
●
70
100
µA
20
30
nA
●
30
60
µA
–60 –150
nA
●
0.01
1
µA
200 300
mV
150 250
mV
150 250
mV
280 400
mV
1
3
5
µA
1
3
5
µA
1
V
SHDN Input Voltage Low
0.4
V
CTRL4 Input Voltage High
0.25
V
CTRL4 Input Voltage Low
0.1
V
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