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LTC1735CS 数据表(PDF) 4 Page - Linear Technology

部件名 LTC1735CS
功能描述  High Efficiency Synchronous Step-Down Switching Regulator
PDF  32 Pages
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制造商  LINER [Linear Technology]
网页  http://www.linear.com
标志 LINER - Linear Technology

LTC1735CS 数据表(HTML) 4 Page - Linear Technology

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LTC1735
1735fc
TYPICAL PERFOR A CE CHARACTERISTICS
Efficiency vs Load Current
(3 Operating Modes)
Efficiency vs Load Current
Efficiency vs Input Voltage
LOAD CURRENT (A)
0.001
60
70
80
BURST
SYNC
10
1735 G01
50
40
20
0.01
0.1
1
30
100
90
VIN = 10V
VOUT = 3.3V
RS = 0.01Ω
fO = 300kHz
EXTVCC OPEN
CONTINUOUS
LOAD CURRENT (A)
0.01
0.1
1
10
1735 G02
100
90
80
70
60
50
40
VIN = 5V
EXTVCC = 5V
FIGURE 1
VIN = 24V
VIN = 15V
INPUT VOLTAGE (V)
0
70
75
80
85
90
100
5
10
15
20
1735 G03
25
30
95
EXTVCC = 5V
VOUT = 1.6V
FIGURE 1
IOUT = 5A
IOUT = 0.5A
Efficiency vs Input Voltage
Load Regulation
VIN – VOUT Dropout Voltage
vs Load Current
INPUT VOLTAGE (V)
0
70
75
80
85
90
100
5
10
15
20
1735 G04
25
30
95
EXTVCC OPEN
VOUT = 1.6V
FIGURE 1
IOUT = 5A
IOUT = 0.5A
LOAD CURRENT (A)
0
–0.2
–0.1
8
1735 G05
–0.3
–0.4
2
4
6
10
0
FCB = 0V
VIN = 15V
FIGURE 1
LOAD CURRENT (A)
0
0
500
400
300
200
100
2468
1735 G06
10
RSENSE = 0.005Ω
VOUT = 5V – 5% DROP
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:
f
CpF
I
I
OSC
OSC
CHG
DIS
=
+


+


8 477 10
11
11
11
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.
ELECTRICAL CHARACTERISTICS



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