LT1947EMSE データシートの表示（PDF） - Linear Technology
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LT1947EMSE Datasheet PDF : 12 Pages
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LT1947
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 = 3.3V unless otherwise specified.
SYMBOL
Error Amplifier Voltage Gain
CT Current Source
CT Threshold to Turn On Q3
FB1 Voltage to Begin CT Charge
SW1 Current Limit
SW2 Current Limit
SW1 Saturation Voltage
SW2 Saturation Voltage
SW1 Maximum Duty Cycle
SW2 Maximum Duty Cycle
Oscillator Frequency
VON Switch Drop
SW1 Leakage Current
SW2 Leakage Current
SHDN Pin Bias Current
SHDN Pin High
SHDN Pin Low
CONDITIONS
EA1 and EA2
VFB1 = 1.3V
(Note 3)
(Note 3)
ISW1 = 800mA
ISW2 = 300mA
IQ3 = 7mA
Switch Off, SW1 = 3.3V
Switch Off, SW2 = 3.3V
VSHDN = 2.4V
Active Mode
Shutdown Mode
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
MIN
4
1.25
1.17
1.1
0.35
82
● 2.3
2.4
TYP
100
5.5
1.28
1.2
1.4
0.6
0.230
0.3
85
3
160
0.01
0.01
10
MAX
6.5
1.30
1.23
2
1
0.280
0.36
3.5
200
5
5
25
0.4
UNITS
V/V
µA
V
V
A
A
V
V
%
%
MHz
mV
µA
µA
µA
V
V
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.
TYPICAL PERFOR A CE CHARACTERISTICS
3.3V TFT-LCD Converter Efficiency
85
80
VIN = 3.3V
75
70
VIN = 3V
VIN = 2.7V
65
60
55
50
45
40
35
0
25 50 75 100 125 150 175 200
AVDD LOAD CURRENT (mA)
1947 G01
Supply Current
12
SHDN = 2.4V
10
8
6
4
–50 –25 0
25 50
TEMPERATURE (°C)
75 100
1947 G02
CT Current Source
–2
–4
–6
–8
–10
–50
–25 0 25 50
TEMPERATURE (°C)
75 100
1947 G03
1947fa
3
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