LT1943 LINER [Linear Technology], LT1943 Datasheet - Page 2

• Manufacturer Part Number: LT1943
• Description: High Current Quad Output Regulator for TFT LCD Panels
• Manufacturer: LINER [Linear Technology]

ABSOLUTE AXI U RATI GS
LT1943
(Note 1)
V
BOOST Voltage ........................................................ 36V
BOOST Voltage Above SW1 ..................................... 25V
BIAS Pin Voltage ..................................................... 18V
SW2, SW4 Pin Voltages .......................................... 40V
SW3 Voltage ............................................................ 36V
FB1, FB2, FB3, FB4 Voltages ...................................... 4V
NFB4 Voltage ................................................ +6V, –0.6V
VC1, VC2, VC3, VC4 Pin Voltages .............................. 6V
RUN-SS, SS-234 Pin Voltages ................................... 6V
PGOOD Pin Voltage ................................................. 36V
E3 Pin Voltage ......................................................... 36V
V
C
Junction Temperature ........................................... 125 C
Operating Temperature Range (Note 2) ...–40 C to 85 C
Storage Temperature Range ..................–65 C to 150 C
Lead Temperature (Soldering, 10 sec).................. 300 C
temperature range, otherwise specifications are at T
PARAMETER
Minimum Input Voltage
Maximum Input Voltage
Quiescent Current
RUN-SS, SS-234 Pin Current
RUN-SS, SS-234 Threshold
BIAS Pin Voltage to Begin SS-234 Charge
BIAS Pin Current
FB Threshold Offset to Begin C
C
C
V
Maximum V
PGOOD Threshold Offset
PGOOD Pin Leakage
Master Oscillator Frequency
Foldback Switching Frequency
Frequency Shift Threshold on FB
2
ELECTRICAL CHARACTERISTICS
T
T
ON
IN
ON
T
Pin Current Source
Threshold to Power V
Pin Voltage ........................................................... 6V
Switch Drop
Voltage .............................................................. 25V
Voltage ............................................................. 36V
ON
Current
W
ON
T
Charge
W W
U
A
= 25 C. V
CONDITIONS
Not Switching
RUN-SS = SS-234 = 0V
RUN-SS, SS-234 = 0.4V
BIAS = 3.1V, All Switches Off
(Note 3)
All FB Pins = 1.5V
All FB Pins = 1.5V
V
V
V
All FB Pins = 0V
ON
E3
PGOOD
200kHz
The
= 30V
Current = 30mA
= 36V
IN
denotes the specifications which apply over the full operating
= 12V, RUN-SS, SS-234 = 2.5V unless otherwise noted.
PACKAGE/ORDER I FOR ATIO
Consult LTC Marketing for parts specified with wider operating temperature ranges.
T
BOOST
JMAX
SGND
NFB4
GND
SW1
SW1
EXPOSED PAD (PIN 29) IS GROUND
VC1
VC2
VC3
VC4
FB1
FB2
FB3
FB4
(MUST BE SOLDERED TO PCB)
= 150 C,
28-LEAD PLASTIC TSSOP
10
11
12
13
14
1
2
3
4
5
6
7
8
9
FE PACKAGE
TOP VIEW
JA
= 25 C/W,
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
JC
= 7.5 C/W
SW2
SW2
V
C
E3
PGOOD
BIAS
SW3
GND
SW4
RUN-SS
SS-234
V
V
ON
T
IN
IN
MIN
1.0
2.4
1.1
1.0
90
16
30
90
U
FE PART MARKING
10.5
TYP
ORDER PART
125
180
125
250
1.7
0.8
2.8
1.1
1.2
0.5
10
35
20
60
LT1943EFE
1943EFE
NUMBER
W
MAX
3.15
1.35
1.46
160
240
160
4.5
1.2
22
45
14
15
25
1
UNITS
U
MHz
MHz
1943i
kHz
mA
mA
mV
mV
mA
mV
V
V
V
A
A
V
V
A
A
V