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參數(shù)資料
| 型號(hào)： | LT1767EMS8#TR-1.8 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 3 A SWITCHING REGULATOR, 1500 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | PLASTIC, MSOP-8 |
| 文件頁數(shù)： | 10/16頁 |
| 文件大?。?/td> | 232K |
| 代理商： | LT1767EMS8#TR-1.8 |
3
LT1767/LT1767-1.8/
LT1767-2.5/LT1767-3.3/LT1767-5
ELECTRICAL CHARACTERISTICS
VC Pin Source Current
VFB = VNOM – 17%
q
80
120
160
A
VC Pin Sink Current
VFB = VNOM + 17%
q
70
110
180
A
VC Pin to Switch Current Transconductance
2.5
A/V
VC Pin Minimum Switching Threshold
Duty Cycle = 0%
0.35
V
VC Pin 1.5A ISW Threshold
0.9
V
Maximum Switch Duty Cycle
VC = 1.2V, ISW = 400mA
85
90
%
q
80
%
Minimum Boost Voltage Above Switch
ISW = –1.5A, 0°C ≤ TA ≤ 125°C and –1.3A, TA < 0°C
q
1.8
2.7
V
Boost Current
ISW = – 0.5A (Note 4)
q
10
15
mA
ISW = –1.5A, 0°C ≤ TA ≤ 125°C and –1.3A, TA < 0°C (Note 4)
q
30
45
mA
SHDN Threshold Voltage
q
1.27
1.33
1.40
V
SHDN Input Current (Shutting Down)
SHDN = 60mV Above Threshold
q
–7
–10
–13
A
SHDN Threshold Current Hysteresis
SHDN = 100mV Below Threshold
q
47
10
A
SYNC Threshold Voltage
1.5
2.2
V
SYNC Input Frequency
1.4
2
MHz
SYNC Pin Resistance
ISYNC = 1mA
20
k
The q denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C.
VIN = 15V, VC = 0.8V, Boost = VIN + 5V, SHDN, SYNC and switch open unless otherwise noted.
PARAMETER
CONDITION
MIN
TYP
MAX
UNITS
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LT1767E is guaranteed to meet performance specifications
from 0
°C to 125°C. Specifications over the –40°C to 125°C operating
junction temperature range are assured by design, characterization and
correlation with statistical process controls.
Note 3: Minimum input voltage is defined as the voltage where the internal
regulator enters lockout. Actual minimum input voltage to maintain a
regulated output will depend on output voltage and load current. See
Applications Information.
Note 4: Current flows into the BOOST pin only during the on period of the
switch cycle.
TYPICAL PERFORMANCE CHARACTERISTICS
UW
TEMPERATURE (
°C)
–50
–25
0
25
50
75
100
125
FB
VOLTAGE
(V)
1767 G01
1.205
1.203
1.201
1.199
1.197
1.195
SWITCH CURRENT (A)
0
0.5
1
1.5
SWITCH
VOLTAGE
(mV)
1767 G02
400
350
300
250
200
150
100
50
0
125
°C
25
°C
–40
°C
TEMPERATURE (
°C)
–50
–25
0
25
50
75
100
125
FREQUENCY
(MHz)
1767 G06
1.40
1.35
1.30
1.25
1.20
FB vs Temperature
Switch On Voltage Drop
Oscillator Frequency
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