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