LTC1735CS Просмотр технического описания (PDF) - Linear Technology
Номер в каталоге
Компоненты Описание
производитель
LTC1735CS Datasheet PDF : 32 Pages
| |||
LTC1735
ELECTRICAL CHARACTERISTICS
Note 3: The LTC1735 is tested in a feedback loop that servos VOSENSE to
the balance point for the error amplifier (VITH = 1.2V).
Note 4: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency. See Applications Information.
Note 5: Oscillator frequency is tested by measuring the COSC charge
current (IOSC) and applying the formula:
fOSC
=
8.477(1011)
COSC(pF) + 11
1
ICHG
+
1
IDIS
–1
Note 6: The minimum on-time condition corresponds to an inductor peak-
to-peak ripple current ≥40% of IMAX (see Minimum On-Time
Considerations in the Applications Information section).
Note 7: Rise and fall times are measured using 10% and 90% levels. Delay
times are measured using 50% levels.
Note 8: The LTC1735E is guaranteed to meet performance specifications
from 0°C to 85°C. Specifications over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls. The LTC1735I specifications are
guaranteed over the full –40°C to 85°C operating temperature range.
TYPICAL PERFOR A CE CHARACTERISTICS
Efficiency vs Load Current
(3 Operating Modes)
100
EXTVCC OPEN
90
BURST
80
SYNC
70
60
CONTINUOUS
50
40
30
20
0.001
VIN = 10V
VOUT = 3.3V
RS = 0.01Ω
fO = 300kHz
0.01
0.1
1
10
LOAD CURRENT (A)
1735 G01
Efficiency vs Load Current
100
EXTVCC = 5V
FIGURE 1
90
VIN = 5V
VIN = 15V
80
VIN = 24V
70
60
50
40
0.01
0.1
1
LOAD CURRENT (A)
10
1735 G02
Efficiency vs Input Voltage
100
EXTVCC OPEN
VOUT = 1.6V
95 FIGURE 1
90
IOUT = 5A
85
IOUT = 0.5A
80
75
70
0
5 10 15 20 25 30
INPUT VOLTAGE (V)
1735 G04
Load Regulation
0
–0.1
FCB = 0V
VIN = 15V
FIGURE 1
–0.2
–0.3
–0.4
0
2
4
6
8
10
LOAD CURRENT (A)
1735 G05
Efficiency vs Input Voltage
100
EXTVCC = 5V
VOUT = 1.6V
95 FIGURE 1
90
IOUT = 5A
85
IOUT = 0.5A
80
75
70
0
5 10 15 20 25 30
INPUT VOLTAGE (V)
1735 G03
VIN – VOUT Dropout Voltage
vs Load Current
500
RSENSE = 0.005Ω
VOUT = 5V – 5% DROP
400
300
200
100
0
0
2
4
6
8
10
LOAD CURRENT (A)
1735 G06
1735fc
4
Share Link: 