参数资料
型号: LTC1735CF#PBF
厂商: Linear Technology
文件页数: 4/32页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM CM 20TSSOP
标准包装: 74
PWM 型: 电流模式
输出数: 1
频率 - 最大: 335kHz
占空比: 99.4%
电源电压: 4 V ~ 30 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: 0°C ~ 85°C
封装/外壳: 20-TSSOP(0.173",4.40mm 宽)
包装: 管件
产品目录页面: 1333 (CN2011-ZH PDF)
LTC1735
ELECTRICAL CHARACTERISTICS
= ?
? 8 . 477 ( 10 11 ) ? ? 1 1 ? – 1
? ?
? C OSC ( pF ) + 11 ? ? I CHG
I DIS ?
Note 3: The LTC1735 is  tested in a feedback loop that servos V OSENSE to
the balance point for the error amplifier (V ITH = 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 C OSC charge
current (I OSC ) and applying the formula:
f OSC + ?
Note 6: The minimum on-time condition corresponds to an inductor peak-
to-peak ripple current ≥ 40% of I MAX (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)
Efficiency vs Load Current
Efficiency vs Input Voltage
100
90
80
EXTV CC OPEN
BURST
100
90
EXTV CC = 5V
FIGURE 1
V IN = 5V
V IN = 15V
100
95
EXTV CC = 5V
V OUT = 1.6V
FIGURE 1
70
SYNC
CONTINUOUS
80
V IN = 24V
90
I OUT = 5A
60
70
85
50
40
V IN = 10V
60
80
I OUT = 0.5A
30
V OUT = 3.3V
R S = 0.01 ?
50
75
20
0.001
0.01
0.1
f O = 300kHz
1
10
40
0.01
0.1 1
10
70
0
5
10 15 20
25
30
LOAD CURRENT (A)
Efficiency vs Input Voltage
1735 G01
LOAD CURRENT (A)
Load Regulation
1735 G02
INPUT VOLTAGE (V)
V IN – V OUT Dropout Voltage
vs Load Current
1735 G03
100
EXTV CC OPEN
V OUT = 1.6V
95 FIGURE 1
0
FCB = 0V
V IN = 15V
FIGURE 1
500
400
R SENSE = 0.005 ?
V OUT = 5V – 5% DROP
–0.1
90
85
80
I OUT = 0.5A
I OUT = 5A
–0.2
300
200
75
–0.3
100
70
0
5
10 15 20
25
30
–0.4
0
2
4
6
8
10
0
0
2
4 6
8
10
INPUT VOLTAGE (V)
1735 G04
LOAD CURRENT (A)
1735 G05
LOAD CURRENT (A)
1735 G06
1735fc
4
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