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LTC1435A Datasheet(PDF) 3 Page - Linear Technology

Part No. LTC1435A
Description  High Efficiency Low Noise Synchronous Step-Down Switching Regulator
Download  20 Pages
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Maker  LINER [Linear Technology]
Homepage  http://www.linear.com
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LTC1435A Datasheet(HTML) 3 Page - Linear Technology

 
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LTC1435A
ELECTRICAL CHARACTERISTICS T
A = 25°C, VIN = 15V, VRUN/SS = 5V unless otherwise noted.
The q denotes specifications which apply over the full operating
temperature range.
LTC1435ACG/LTC1435ACS: 0
°C ≤ TA ≤ 70°C
LTC1435AIG/LTC1435AIS: – 40
°C ≤ TA ≤ 85°C
Note 1: TJ is calculated from the ambient temperature TA and power
dissipation PD according to the following formula:
LTC1435ACG/LTC1435AIG: TJ = TA + (PD)(130°C/W)
LTC1435ACS/LTC1435AIS: TJ = TA + (PD)(110°C/W)
Note 2: The LTC1435A 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) =
+
–1
8.4(108)
COSC (pF) + 11
() 1
ICHG
()1
IDIS
Note 5: The minimum on-time test condition corresponds to an inductor
peak-to-peak ripple current
≥40% of IMAX (see Minimum On-Time
Considerations in the Applications Information section).
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Oscillator
fOSC
Oscillator Frequency
COSC = 100pF (Note 4)
112
125
138
kHz
TYPICAL PERFORMANCE CHARACTERISTICS
INPUT VOLTAGE (V)
0
70
75
80
85
90
100
5
10
15
20
1435A G01
25
30
95
ILOAD = 1A
ILOAD = 100mA
VOUT = 3.3V
Efficiency vs Input Voltage
VOUT = 3.3V
VIN – VOUT Dropout Voltage
vs Load Current
LOAD CURRENT (A)
0
0
0.2
0.1
0.3
0.4
0.5
0.5
1.0
1.5
2.0
1435A G04
2.5
3.0
RSENSE = 0.033Ω
VOUT DROP OF 5%
LOAD CURRENT (A)
0.001
50
55
65
70
75
100
85
0.01
0.1
1
1435A G03
60
90
95
80
10
CONTINUOUS
MODE
VIN = 10V
VOUT = 5V
RSENSE = 0.033Ω
Burst Mode
OPERATION
Efficiency vs Load Current
VITH Pin Voltage vs Output Current
OUTPUT CURRENT (%)
0
1.0
2.0
3.0
0.5
1.5
2.5
20
40
60
80
1435A G06
100
10
030
50
70
90
Burst Mode
OPERATION
CONTINUOUS
MODE
INPUT VOLTAGE (V)
0
70
75
80
85
90
100
5
10
15
20
1435A G02
25
30
95
ILOAD = 1A
ILOAD = 100mA
VOUT = 5V
Efficiency vs Input Voltage
VOUT = 5V
Load Regulation
LOAD CURRENT (A)
0
0
0.5
1.0
1.5
2.0
1435A G05
2.5
3.0
– 0.25
– 0.50
– 0.75
–1.00
–1.25
–1.50
RSENSE = 0.033Ω


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