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LT1942 Datasheet(PDF) 3 Page - Linear Technology

Part # LT1942
Description  Quad DC/DC Converter for Triple Output TFT Supply Plus LED Driver
PDF  16 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT1942 Datasheet(HTML) 3 Page - Linear Technology

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LT1942
3
1942fb
LED1-LED2 Current Matching
Current Into Each Pin = 20mA, VLED1 = VLED2
0
1.5
%
Current Into Each Pin = 20mA, |VLED1-VLED2| = 1V
1
2.5
%
LED1 Voltage
20mA Into Pin, VLED2 = 2V, FB4 = 0
1
1.2
V
LED2 Voltage
20mA Into Pin, VLED1 = 2V, FB4 = 0
1
1.2
V
LED1, LED2 Maximum Current
Into Either Pin, VLEDX < 1.5V, FB4 = 0
35
mA
LED1, LED2 Leakage Current
VSHDN = 0V, VLEDX = 45V
●
1
µA
AVDD Maximum Duty Cycle
SW1 Pin
88
93
%
VOFF Maximum Duty Cycle
SW2 Pin
75
86
%
VON Maximum Duty Cycle
SW3 Pin
75
86
%
LED Maximum Duty Cycle
SW4 Pin
88
93
%
AVDD Switch Current Limit at Minimum DC (SW1)
SW1 Pin (Note 4)
150
200
250
mA
AVDD Switch Current Limit at Maximum DC (SW1)
SW1 Pin (Note 4)
80
140
200
mA
VOFF Switch Current Limit at Minimum DC (SW2)
SW2 Pin (Note 4)
50
80
110
mA
VOFF Switch Current Limit at Maximum DC (SW2)
SW2 Pin (Note 4)
30
60
90
mA
VON Switch Current Limit at Minimum DC (SW3)
SW3 Pin (Note 4)
50
80
110
mA
VON Switch Current Limit at Maximum DC (SW3)
SW3 Pin (Note 4)
30
60
90
mA
LED Switch Current Limit at Minimum DC (SW4)
SW4 Pin (Note 4)
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
D2 Pin, I = 60mA
0.65
V
VOFF Schottky Diode Leakage Current
D2 Pin, VD2 = –36V
●
1
µA
VON Schottky Diode Forward Drop
D3 Pin, I = 60mA
0.65
V
VON Schottky Diode Leakage Current
VD3 = 36V, SW3 = 0V, Output Disconnect PNP Off ●
1
µA
LED Schottky Diode Forward Drop
I = 250mA
0.75
V
LED Schottky Diode Leakage Current
VD4 = 36V, SW4 = 0V
●
1
µA
Switching Frequency
0.8
1
1.2
MHz
SHDN Pin Current
VSHDN = 3V
●
70
100
µA
VSHDN = 0V
20
30
nA
CTRL4 Pin Current
VCTRL4 = 3V
●
30
60
µA
VCTRL4 = 0V
–60
–150
nA
SW1-SW4 leakage Current
VSWX = 36V
●
0.01
1
µA
SW1 VCESAT
ISW1 = 100mA (Note 5)
200
300
mV
SW2 VCESAT
ISW2 = 40mA (Note 5)
150
250
mV
SW3 VCESAT
ISW3 = 40mA (Note 5)
150
250
mV
SW4 VCESAT
ISW4 = 400mA (Note 5)
280
400
mV
SS1 Charging Current
VSS = 0.5V
1
3
5
µA
SS4 Charging Current
VSS = 0.5V
1
3
5
µA
SHDN Input Voltage High
1V
SHDN Input Voltage Low
0.4
V
CTRL4 Input Voltage High
0.25
V
CTRL4 Input Voltage Low
0.1
V
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
ELECTRICAL CHARACTERISTICS



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