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参数资料
| 型号： | LTC3785EUF-1#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 4/20页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BST PWM VM 24-QFN |
| 标准包装： | 2,500 |
| PWM 型： | 电压模式 |
| 输出数： | 2 |
| 频率 - 最大： | 1MHz |
| 占空比： | 99% |
| 电源电压： | 2.7 V ~ 10 V |
| 降压： | 是 |
| 升压： | 是 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 24-WFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
LTC3785-1
ELECTRICAL CHARACTERISTICS The l denotes the speci?cations which apply over the full operating
temperature range, otherwise speci?cations are at T A = 25°C. V IN = I SVOUT = V DRV = V BST1 = V BST2 = 3.6V, R T = 49.9k, R ILSET = 59k.
PARAMETER
PGOOD Output Low
PGOOD Leakage
V SENSE Input Current
CONDITIONS
I PGOOD = 500μA
V PGOOD = 5.5V
V SENSE = Measured FB Voltage
MIN
TYP
200
1
MAX
500
5
500
UNITS
mV
μA
nA
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LTC3785E-1 is guaranteed to meet performance speci?cations
from 0°C to 85°C. Speci?cations over –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
Note 3: Speci?cation is guaranteed by design and not 100% tested in production.
Note 4: Current measurements are performed when the outputs are not switching.
Note 5: The IC is tested in a feedback loop to make the measurement.
TYPICAL PERFORMANCE CHARACTERISTICS
100
Li-Ion to 3.3V Ef?ciency
vs Load Current
100
Two Li-Ion to 7V Ef?ciency
vs Load Current
100
Li-Ion/9V to 5V V OUT Ef?ciency
vs Load Current
90
80
Burst Mode
OPERATION
90
80
Burst Mode
OPERATION
90
80
Burst Mode
OPERATION
70
70
70
60
FIXED
FREQUENCY
60
FIXED
FREQUENCY
60
FIXED
FREQUENCY
50
50
50
40
30
20
V IN = 4.2V
V IN = 3.6V
V IN = 3V
MOSFET Si7940
40
30
20
V IN = 8.4V
V IN = 7.2V
V IN = 5.4V
MOSFET Si7940
40
30
20
V IN = 9V
V IN = 4.2V
V IN = 3.6V
V IN = 2.7V
MOSFET Si7940
10
0
0.0001
0.001
L = 4.7μH WURTH WE-PD
f OSC = 500kHz
0.01 0.1 1 10
10
0
0.0001
0.001
L = 5.6μH MSS1260
f OSC = 430kHz
0.01 0.1 1 10
10
0
0.0001
0.001
L = 5.6μH MSS1260
f OSC = 430kHz
0.01 0.1 1 10
V OUT
50mV/DIV
AC
COUPLED
INDUCTOR
CURRENT
1A/DIV
LOAD CURRENT (A)
Burst Mode Ripple
37851 G01
V OUT
500mV/DIV
V IN
3V TO 8.5V
LOAD CURRENT (A)
Line Transient Response
37851 G02
V OUT
200mV/
DIV
I LOAD
10mA TO 2A
LOAD CURRENT (A)
V OUT Load Transient
37851 G03
V OUT = 3.3V
C OUT = 100μF
5μs/DIV
37851 G04
I LOAD = 300μA
V OUT = 5V
500μs/DIV
37851 G05
V IN = 3.6V
V OUT = 3.3V
100μs/DIV
37851 G06
C
100μF
37851fa
4
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