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參數(shù)資料
| 型號(hào)： | LT1076IT-5#TR |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 3.2 A SWITCHING REGULATOR, 120 kHz SWITCHING FREQ-MAX, PZFM5 |
| 封裝： | PLASTIC, TO-220, 5 PIN |
| 文件頁(yè)數(shù)： | 3/8頁(yè) |
| 文件大?。?/td> | 108K |
| 代理商： | LT1076IT-5#TR |
LT1076-5
3
10765fc
ELECTRICAL CHARACTERISTICS
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 (VSENSE) 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.
Note 4: Total voltage from VIN pin to ground pin must be ≥ 8V after start-
up for proper regulation. For TA < 25°C, limit = 5V.
Note 5: Switch frequency is internally scaled down when the sense pin
voltage is less than 2.6V to avoid extremely short switch on times. During
The
l denotes the specications which apply over the full operating
temperature range, otherwise specications are at TJ = 25°C. VIN = 25V, unless otherwise noted.
current limit testing, VSENSE is adjusted to give a minimum switch on time
of 1ms.
Note 6: Switch to input voltage limitation must also be observed.
Note 7: VMAX = 40V for the LT1076-5 and 60V for the LT1076HV-5.
Note 8: Error amplier voltage gain and transconductance are
specied relative to the internal feedback node. To calculate gain and
transconductance from the Sense pin (Output) to the VC pin, multiply by
0.44.
Note 9: Does not include switch leakage.
Note 10:
I
Rk
k
LIM
≈
1
5
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Supply Current (Note 3)
VOUT = 5.5V, VIN ≤ 40V
40V < VIN < 60V
VSHDN = 0.1V (Device Shutdown) (Note 9)
l
8.5
9.0
140
11
12
300
mA
μA
Minimum Supply Voltage
Normal Mode
Start-Up Mode (Note 4)
l
7.3
3.5
8.0
4.8
V
Switch Current Limit (Note 5)
ILIM = Open
RLIM = 10k (Note 10)
RLIM = 7k (Note 10)
l
2
2.6
1.8
1.2
3.2
A
Maximum Duty Cycle
l
85
90
%
Switching Frequency
TJ ≤ 125°C
VOUT = VSENSE = 0V (Note 5)
l
90
85
100
20
110
120
kHz
Switching Frequency Line Regulation 8V ≤ VIN ≤ VMAX (Note 8)
l
0.03
0.1
%/V
Error Amplier Voltage Gain (Note 8) 1V ≤ VC ≤ 4V
2000
V/V
Error Amplier Transconductance
(Note 8)
3700
5000
8000
μmho
Error Amplier Source and Sink
Current
Source (VSENSE = 4.5V)
Sink (VSENSE = 5.5V)
100
0.7
140
1.0
225
1.6
μA
mA
Sense Pin Divider Resistance
358
kΩ
Sense Voltage
VC = 2V
l
4.85
5
5.15
V
Output Voltage Tolerance
VOUT (Nominal) = 5V
All Conditions of Input Voltage, Output Voltage,
Temperature and Load Current
l
±0.5
±1.0
±2
±3
%
Output Voltage Line Regulation
8V ≤ VIN ≤ VMAX (Note 7)
l
0.005
0.02
%/V
VC Voltage at 0% Duty Cycle
Over Temperature
l
1.5
–4.0
V
mV/°C
Multiplier Reference Voltage
24
V
Shutdown Pin Current
VSHDN = 5V
VSHDN ≤ VTHRESHOLD ( 2.5V)
510
20
50
μA
Shutdown Thresholds
Switch Duty Cycle = 0
Fully Shut Down
2.2
0.1
2.45
0.30
2.7
0.5
V
Thermal Resistance Junction to Case
4°C/W
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