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| 型号： | LT1076CR-5 |
| 厂商： | Linear Technology |
| 文件页数： | 3/8页 |
| 文件大小： | 0K |
| 描述： | IC REG MULTI CONFIG 5V 2A D2PAK |
| 标准包装： | 50 |
| 类型： | 降压（降压），升压（升压），反相，回扫 |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 5V |
| 输入电压： | 8 V ~ 45 V |
| 频率 - 开关： | 100kHz |
| 电流 - 输出： | 2A |
| 同步整流器： | 无 |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | TO-263-8，D²Pak（7 引线+接片），TO-263CA |
| 包装： | 管件 |
| 供应商设备封装： | D2PAK-7 |
LT1076-5
ELECTRICAL CHARACTERISTICS The l denotes the speci?cations which apply over the full operating
temperature range, otherwise speci?cations are at T J = 25°C. V IN = 25V, unless otherwise noted.
SYMBOL
Supply Current (Note 3)
Minimum Supply Voltage
CONDITIONS
V OUT = 5.5V, V IN ≤ 40V
40V < V IN < 60V
V SHDN = 0.1V (Device Shutdown) (Note 9)
Normal Mode
Start-Up Mode (Note 4)
l
l
l
l
MIN
TYP
8.5
9.0
140
7.3
3.5
MAX
11
12
300
8.0
4.8
UNITS
mA
mA
μA
V
V
Switch Current Limit (Note 5)
I LIM = Open
l
2
2.6
3.2
A
R LIM = 10k (Note 10)
R LIM = 7k (Note 10)
1.8
1.2
A
A
Maximum Duty Cycle
l
85
90
%
Switching Frequency
T J ≤ 125°C
l
90
85
100
110
120
kHz
kHz
V OUT = V SENSE = 0V (Note 5)
20
kHz
Switching Frequency Line Regulation 8V ≤ V IN ≤ V MAX (Note 8)
Error Ampli?er Voltage Gain (Note 8) 1V ≤ V C ≤ 4V
Error Ampli?er Transconductance
l
3700
0.03
2000
5000
0.1
8000
%/V
V/V
μmho
(Note 8)
Error Ampli?er Source and Sink
Current
Sense Pin Divider Resistance
Source (V SENSE = 4.5V)
Sink (V SENSE = 5.5V)
100
0.7
3
140
1.0
5
225
1.6
8
μA
mA
kΩ
Sense Voltage
Output Voltage Tolerance
V C = 2V
V OUT (Nominal) = 5V
All Conditions of Input Voltage, Output Voltage,
l
l
4.85
5
±0.5
±1.0
5.15
±2
±3
V
%
%
Temperature and Load Current
Output Voltage Line Regulation
VC Voltage at 0% Duty Cycle
8V ≤ V IN ≤ V MAX (Note 7)
Over Temperature
l
l
0.005
1.5
–4.0
0.02
%/V
V
mV/°C
Multiplier Reference Voltage
24
V
Shutdown Pin Current
Shutdown Thresholds
V SHDN = 5V
V SHDN ≤ V THRESHOLD ( ? 2.5V)
Switch Duty Cycle = 0
Fully Shut Down
5
2.2
0.1
10
2.45
0.30
20
50
2.7
0.5
μA
μA
V
V
Thermal Resistance Junction to Case
4
°C/W
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: To calculate maximum switch “on” voltage at currents between
low and high conditions, a linear interpolation may be used.
Note 3: A sense pin voltage (V SENSE ) of 5.5V forces the VC pin to its low
clamp level and the switch duty cycle to zero. This approximates the zero
load condition where duty cycle approaches zero.
current limit testing, V SENSE is adjusted to give a minimum switch on time
of 1ms.
Note 6: Switch to input voltage limitation must also be observed.
Note 7: V MAX = 40V for the LT1076-5 and 60V for the LT1076HV-5.
Note 8: Error ampli?er voltage gain and transconductance are
speci?ed relative to the internal feedback node. To calculate gain and
transconductance from the Sense pin (Output) to the V C pin, multiply by
0.44.
Note 9: Does not include switch leakage.
Note 4: Total voltage from V IN pin to ground pin must be ≥ 8V after start-
up for proper regulation. For T A < 25°C, limit = 5V.
Note 5: Switch frequency is internally scaled down when the sense pin
Note 10:
I LIM ≈
R LIM ? 1k
5 k
voltage is less than 2.6V to avoid extremely short switch on times. During
10765fc
3
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