参数资料
型号: LT1776CN8
厂商: LINEAR TECHNOLOGY CORP
元件分类: 稳压器
英文描述: RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS
中文描述: 0.7 A SWITCHING REGULATOR, 230 kHz SWITCHING FREQ-MAX, PDIP8
封装: 0.300 INCH, PLASTIC, DIP-8
文件页数: 3/20页
文件大小: 147K
代理商: LT1776CN8
3
LT1776
ELECTRICAL CHARACTERISTICS
The
G
denotes specifications which apply over the full operating temperature range, otherwise specifications are T
A
= 25
°
C.
V
IN
= 40V, V
SW
open, V
CC
= 5V, V
C
= 1.4V unless otherwise noted.
SYMBOL
Timing
f
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Switching Frequency
180
170
85
200
220
230
kHz
kHz
%
ns
G
Maximum Switch Duty Cycle
Minimum Switch On Time
Boost Operation
V
C
Pin Boost Threshold
dV/dt Below Threshold
dV/dt Above Threshold
Sync Function
Minimum Sync Amplitude
Synchronization Range
SYNC Pin Input R
SHDN Pin Function
V
SHDN
Shutdown Mode Threshold
G
90
300
t
ON(MIN)
High dV/dt Mode, R
L
= 39
(Note 4)
1.35
0.2
1.6
V
V/ns
V/ns
G
1.5
2.2
400
V
(Note 6)
G
250
kHz
k
40
0.5
V
V
V
V
G
0.2
0.8
Upper Lockout Threshold
Lower Lockout Threshold
Shutdown Pin Current
Switching Action On
Switching Action Off
V
SHDN
= 0V
V
SHDN
= 1.25V
1.260
1.245
12
2.5
I
SHDN
20
10
μ
A
μ
A
Note 1:
Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2:
Control circuitry powered from V
CC
.
Note 3:
Switch current limit is DC trimmed and tested in production.
Inductor dl/dt rate will cause a somewhat higher current limit in actual
application.
Note 4:
Minimum switch on time is production tested with a 39
resistive
load to ground.
Note 5:
Parts are guaranteed to survive 60V on V
IN
and V
SW
. However,
thermal constraints will limit V
IN
in some applications, depending primarily
on maximum output current and switching frequency. See Applications
section for more information.
Note 6:
Internal oscillator is guaranteed to sync up to 400kHz. However,
thermal constraints and/or controllability issues may place a lower limit on
switching frequency in actual usage. See Applications section for more
information.
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