LT1947 LINER [Linear Technology], LT1947 Datasheet - Page 2

• Manufacturer Part Number: LT1947
• Description: Adjustable Output TFT-LCD Triple Switching Regulator
• Manufacturer: LINER [Linear Technology]

ABSOLUTE AXI U RATI GS
LT1947
(Note 1)
V
C
SW1, SW2 Voltage .................................................. 36V
V
FB1, FB2 .................................................................... 3V
SHDN ......................................................................... 8V
Operating Temperature Range (Note 2) .. – 40 C to 85 C
Lead Temperature (Soldering, 10 sec).................. 300 C
ELECTRICAL CHARACTERISTICS
SYMBOL
Input Voltage Range
Supply Current
FB1 Voltage
FB2 Voltage
Reference Line Regulation
Error Amplifier Voltage Gain
C
C
FB1 Voltage to Begin C
SW1 Current Limit
SW2 Current Limit
SW1 Saturation Voltage
SW2 Saturation Voltage
SW1 Maximum Duty Cycle
SW2 Maximum Duty Cycle
Oscillator Frequency
V
SW1 Leakage Current
SW2 Leakage Current
SHDN Pin Bias Current
SHDN Pin High
SHDN Pin Low
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LT1947 is guaranteed to meet performance specifications
from 0 C to 70 C. Specifications over the – 40 C to 85 C operating
2
temperature range, otherwise specifications are at T
T
T
ON
IN
T
ON
Current Source
Threshold to Turn On Q3
Voltage.................................................................. 6V
Switch Drop
Voltage ................................................................ 8V
, V
O2
Voltage ..................................................... 30V
T
W
Charge
W W
CONDITIONS
SHDN = 2.4V
SHDN = 0V
V
EA1 and EA2
V
(Note 3)
(Note 3)
I
I
I
Switch Off, SW1 = 3.3V
Switch Off, SW2 = 3.3V
V
Active Mode
Shutdown Mode
SW1
SW2
Q3
IN
FB1
SHDN
= 7mA
= 2.7V to 8V
= 1.3V
= 800mA
= 300mA
= 2.4V
U
A
= 25 C. V
The
IN
denotes the specifications which apply over the full operating
= 3.3V, V
PACKAGE/ORDER I FOR ATIO
Consult LTC Marketing for parts specified with wider operating temperature ranges.
temperature range are assured by design, characterization and correlation
with statistical process controls.
Note 3: Switch current limit guaranteed by design and/or correlation to
static tests.
SW1
GND
FB1
FB2
C
T
SHDN
T
10-LEAD PLASTIC MSOP
JMAX
1
2
3
4
5
= 3.3V unless otherwise specified.
= 125 C,
MS PACKAGE
TOP VIEW
JA
= 120 C/W
10
9
8
7
6
V
V
SHDN
SW2
V
ON
O2
IN
1.240
1.225
1.225
1.210
1.25
1.17
0.35
MIN
2.7
1.1
2.3
2.4
82
4
U
MS PART MARKING
0.230
1.26
1.26
0.01
1.28
0.01
0.01
TYP
100
160
ORDER PART
9.5
5.5
1.2
1.4
0.6
0.3
85
10
LT1947EMS
3
NUMBER
W
LTUE
1.280
1.295
1.295
1.310
0.280
MAX
12.5
0.05
1.30
1.23
0.36
200
6.5
3.5
0.4
25
8
1
2
1
5
5
UNITS
U
MHz
1947f
%/V
V/V
mA
mV
%
%
V
A
V
V
V
V
A
V
V
A
A
V
V
A
A
A
V
V