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| 型号： | LTC3814IFE-5#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 4/30页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BST PWM CM 16-TSSOP |
| 标准包装： | 2,500 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 1MHz |
| 占空比： | 90% |
| 电源电压： | 4.5 V ~ 55 V |
| 降压： | 无 |
| 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 ~ 125°C |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 包装： | 带卷 (TR) |
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LTC3814-5
ELECTRICAL CHARACTERISTICS The l denotes speci?cations which apply over the full operating
temperature range, otherwise speci?cations are at T A = 25°C (Note 2), INTV CC = V BOOST = V RNG = V EXTVCC = V NDRV = V OFF = 5V, unless
otherwise speci?ed.
SYMBOL
PG Delay
PARAMETER
PGOOD Delay
CONDITIONS
V FB Falling
MIN
TYP
125
MAX
UNITS
μs
V CC Regulators
V EXTVCC
EXTV CC Switchover Voltage
EXTV CC Rising
EXTV CC Hysteresis
l
4.5
0.1
4.7
0.25
0.4
V
V
V INTVCC,1
? V EXTVCC,1
? V LOADREG,1
V INTVCC,2
? V LOADREG,2
I NDRV
INTV CC Voltage from EXTV CC
V EXTVCC - V INTVCC at Dropout
INTV CC Load Regulation from EXTV CC
INTV CC Voltage from NDRV Regulator
INTV CC Load Regulation from NDRV
Current into NDRV Pin
6V < V EXTVCC < 15V
I CC = 20mA, V EXTVCC = 5V
I CC = 0mA to 20mA, V EXTVCC = 10V
Linear Regulator in Operation
I CC = 0mA to 20mA, V EXTVCC = 0
V NDRV – V INTVCC = 3V
5.2
5.2
20
5.5
75
0.01
5.5
0.01
40
5.8
150
5.8
60
V
mV
%
V
%
μA
V CCSR
I CCSR
Maximum Supply Voltage
Maximum Current into NDRV/INTV CC
Trickle Charger Shunt Regulator
Trickle Charger Shunt Regulator,
10
15
V
mA
INTV CC ≤ 16.7V (Note 8)
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 LTC3814-5 is tested under pulsed load conditions such that
T J ≈ T A . The LTC3814E-5 is guaranteed to meet performance speci?cations
from 0°C to 85°C. Speci?cations over the –40°C to 125°C operating
junction temperature range are assured by design, characterization and
correlation with statistical process controls. The LTC3814I-5 is guaranteed
to meet performance speci?cations over the full –40°C to 125°C operating
junction temperature range.
Note 3: T J is calculated from the ambient temperature T A and power
dissipation P D according to the following formula:
Note 4: The LTC3814-5 is tested in a feedback loop that servos V FB to the
reference voltage with the I TH pin forced to a voltage between 1V and 2V.
Note 5: The dynamic input supply current is higher due to the power
MOSFET gate charging being delivered at the switching frequency
(Q G ? f SW ).
Note 6: Guaranteed by design. Not subject to test.
Note 7: This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when overtemperature protection is active.
Continuous operation above the speci?ed maximum operating junction
temperature may impair device reliability.
Note 8: I CC is the sum of current into NDRV and INTV CC .
LTC3814-5: T J = T A + (P D ? 38°C/W)
TYPICAL PERFORMANCE CHARACTERISTICS
V OUT
200mV/DIV
I OUT
2A/DIV
Load Transient Response
V OUT
10V/DIV
RUN/SS
4V/DIV
I L
5A/DIV
Start-Up
V OUT
10V/DIV
I L
5A/DIV
Overcurrent Operation
100 μ s/DIV
FRONT PAGE CIRCUIT
V IN = 12V
0A TO 4A LOAD STEP
38145 G01
1ms/DIV
FRONT PAGE CIRCUIT
V IN = 12V
I LOAD = 1A
38145 G02
200μs/DIV
V RNG = 1V
FRONT PAGE CIRCUIT
V IN = 12V
R SHORT = 1 Ω
38145 G03
38145fc
4
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