LTC1435I データシートの表示（PDF） - Linear Technology
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LTC1435I Datasheet PDF : 20 Pages
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LTC1435
ELECTRICAL CHARACTERISTICS TA = 25°C, VIN = 15V, VRUN/SS = 5V unless otherwise noted.
The q denotes specifications which apply over the full operating
temperature range.
LTC1435CG/LTC1435CS: 0°C ≤ TA ≤ 70°C
LTC1435IG/LTC1435IS: – 40°C ≤ TA ≤ 85°C
Note 1: TJ is calculated from the ambient temperature TA and power
dissipation PD according to the following formula:
LTC1435CG/LTC1435IG: TJ = TA + (PD)(130°C/W)
LTC1435CS/LTC1435IS: TJ = TA + (PD)(110°C/W)
Note 2: The LTC1435 is tested in a feedback loop which servos VOSENSE
to the balance point for the error amplifier (VITH = 1.19V).
Note 3: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency. See Applications Information.
Note 4: Oscillator frequency is tested by measuring the COSC charge and
discharge currents and applying the formula:
( ) ( ) fOSC (kHz) =
8.4(108)
COSC (pF) + 11
1
ICHG
+
1
IDIS
–1
TYPICAL PERFORMANCE CHARACTERISTICS
Efficiency vs Input Voltage
VOUT = 3.3V
100
VOUT = 3.3V
95
ILOAD = 1A
90
85
ILOAD = 100mA
80
75
70
0
5 10 15 20 25 30
INPUT VOLTAGE (V)
1435 G01
VIN – VOUT Dropout Voltage
vs Load Current
0.5
RSENSE = 0.033Ω
VOUT DROP OF 5%
0.4
0.3
0.2
0.1
0
0 0.5 1.0 1.5 2.0 2.5 3.0
LOAD CURRENT (A)
1435 G04
Efficiency vs Input Voltage
VOUT = 5V
100
VOUT = 5V
95
ILOAD = 1A
90
ILOAD = 100mA
85
80
75
70
0
5 10 15 20 25 30
INPUT VOLTAGE (V)
1435 G02
Load Regulation
0
– 0.25
RSENSE = 0.033Ω
– 0.50
– 0.75
–1.00
–1.25
–1.50
0
0.5 1.0 1.5 2.0 2.5 3.0
LOAD CURRENT (A)
1435 G05
Efficiency vs Load Current
100
VIN = 10V
95 VOUT = 5V
90 RSENSE = 0.033Ω
85
80
75
CONTINUOUS
MODE
70
Burst Mode
OPERATION
65
60
55
50
0.001
0.01
0.1
1
10
LOAD CURRENT (A)
1435 G03
VITH Pin Voltage vs Output Current
3.0
2.5
2.0
1.5
Burst Mode
OPERATION
1.0
0.5
CONTINUOUS
MODE
0
0 10 20 30 40 50 60 70 80 90 100
OUTPUT CURRENT (%)
1435 G06
3
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