參數(shù)資料
型號： LTC1267-ADJ
廠商： Linear Technology Corporation
英文描述： XTAL MTL T/H HC49/US
中文描述： 雙通道高效率同步降壓型開關(guān)穩(wěn)壓器
文件頁數(shù)： 4/16頁
文件大?。?/td> 341K
代理商： LTC1267-ADJ
4
LTC1267
LTC1267-ADJ/LTC1267-ADJ5
SYMBOL
V
FB1
,
2
V
OUT
PARAMETER
Feedback Voltage
Regulated Output Voltage
3.3V Output
5V Output
V
IN
Pin Current (Note 3)
Normal
CONDITIONS
LTC1267-ADJ, LTC1267-ADJ5: V
IN
= 9V
V
IN
= 9V
I
LOAD
= 700mA
I
LOAD
= 700mA
MIN
1.2
TYP
1.25
MAX
1.3
UNITS
V
3.17
4.85
3.30
5.05
3.48
5.25
V
V
I
IN
V
IN
= 12V, EXT V
CC
= 5V
V
IN
= 40V, EXT V
CC
= 5V
V
IN
= 12V, V
MSHDN
= 2V
V
IN
= 40V, V
MSHDN
= 2V
EXT V
CC
= 5V, Sleep Mode
V
IN
= 12V to 40V, EXT V
CC
= 0V, I
CC
= 20mA
Low Threshold (Forced)
High Threshold (Forced)
320
550
15
25
360
4.5
25
160
1.4
5
μ
A
μ
A
μ
A
μ
A
μ
A
V
mV
mV
Shutdown
I
EXTVCC
V
CC
V
SENSE+
–
V
SENSE–
V
MSHDN
t
OFF
EXT V
CC
Pin Current (Note 3)
Internal Regulator Voltage
Current Sense Threshold Voltage
130
0.8
3
185
2.0
7
Shutdown Threshold MSHDN
Off-Time (Note 4)
V
C
T
= 390pF, I
LOAD
= 700mA, V
IN
= 10V
μ
s
ELECTRICAL C
–40
°
C
≤
T
A
≤
85
°
C, V
IN
= 12V, V
MSHDN,
V
SHDN1,3,5
= 0V (Notes 2, 5), unless otherwise noted.
HARC
The
G
denotes specifications which apply over the full operating
temperature range.
Note 1:
T
J
is calculated from the ambient temperature T
A
and power
dissipation P
D
according to the following formula:
LTC1267/LTC1267-ADJ/LTC1267ADJ5: T
J
= T
A
+ (P
D
×
95
°
C/W)
Note 2:
On LTC1267 versions which have MSHDN and SHDN1, 3, 5 pins,
they must be at ground potential for testing.
Note 3:
The LTC1267 V
IN
and EXT V
CC
current measurements exclude
MOSFET driver currents. When V
CC
power is derived from the output via
EXT V
CC
, the input current increases by (I
GATECHG
×
Duty Cycle)/Efficiency.
See Typical Performance Characteristics and Applications Information.
Note 4:
In applications where R
SENSE
is placed at ground potential, the
off-time increases approximately 40%.
Note 5:
The LTC1267/LTC1267-ADJ/LTC1267-ADJ5 are not tested and
quality-assurance sampled at –40
°
C to 85
°
C. These specifications are
guaranteed by design and/or correlation.
Note 6:
The logic level power MOSFETs shown in Figure 1 are rated for
V
DS(MAX)
= 30V. For operation at V
IN
> 30V, use standard threshold
MOSFETs with EXT V
CC
powered from a 9V supply. See applications
information.
Note 7:
LTC1267-ADJ and LTC1267-ADJ5 are tested at an output of 3.3V
TYPICAL PERFOR
M
A
CE CHARACTERISTICS
U
LOAD CURRENT (A)
0.01
80
E
90
100
0.1
1
10
LTC1267 G01
70
75
85
95
65
60
V
IN
= 10V
V
IN
= 20V
5V Output Efficiency
vs Load Current
LOAD CURRENT
0
–60
O
–50
–30
–20
–10
1.0
2.0
2.5
30
LTC1267 G03
–40
0.5
1.5
0
10
20
V
IN
= 10V
V
OUT
= 3.3V
V
IN
= 20V
V
OUT
= 3.3V
V
IN
= 10V
V
OUT
= 5V
V
IN
= 20V
V
OUT
= 5V
Load Regulation
LOAD CURRENT (A)
0.01
80
E
90
100
0.1
1
10
LTC1267 G02
70
75
85
95
65
60
V
IN
= 10V
V
IN
= 20V
3.3V Output Efficiency
vs Load Current
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