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LTC2927CDDB bảng dữ liệu(PDF) 4 Page - Linear Technology

tên linh kiện LTC2927CDDB
Giải thích chi tiết về linh kiện  Single Power Supply Tracking Controller
PDF  16 Pages
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nhà sản xuất  LINER [Linear Technology]
Trang chủ  http://www.linear.com
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LTC2927CDDB bảng dữ liệu(HTML) 4 Page - Linear Technology

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LTC2927
4
2927fb
PIN FUNCTIONS
VCC (V)
0
0.0
0.2
0.4
0.6
0.8
1.0
1234
2927 G0
5
ISDO = 5mA
ISDO = 10μA
2.5
3.0
3.5
4.0
4.5
6.0
5.5
5.0
VCC (V)
10
20
30
40
50
60
2927 G07
VTRACK = 0V
ITRACK (mA)
1
0
1
2
3
4
5
234
2927 G0
5
ERROR =
•
VTRACK
0.8V
–1
IFB
ITRACK
Tracking Cell Error vs ITRACK
VSDO(OL) vs VCC
VCC (Pin 1/Pin 8): Supply Voltage Input. Operating range
is from 2.9V to 5.5V. An undervoltage lockout asserts SDO
until VCC > 2.5V. VCC should be bypassed to GND with a
0.1μF capacitor.
SDO (Pin 2/Pin 7): Slave Supply Shutdown Output. SDO
is an open-drain output that holds the shutdown (RUN/SS)
pin of the slave supply low until the VCC pin is pulled above
2.5V, and the ON pin is pulled above 1.23V, or RAMP is
above 200mV. SDO is pulled low again when both RAMP
< 200mV and ON < 1.23V. If the slave supply is capable
of operating with an input supply that is lower than the
LTC2927’s minimum operating voltage of 2.9V, the SDO
pin can be used to hold off the slave supply. Tie the SDO
pin to GND if unused.
FB (Pin 3/Pin 6): Feedback Control Output. FB pulls up
on the feedback node of the slave supply. Tracking is
achieved by mirroring the current from TRACK into FB.
A resistive divider connecting RAMPBUF and TRACK will
force the output voltage of the slave supply to track RAMP.
To prevent damage to the slave supply, the FB pin will not
force the slave’s feedback node above 2.3V. In addition,
the LTC2927 will not actively sink current from this node,
even when it is unpowered.
TSOT/DFN Packages
MAX ITRACK vs VCC
TYPICAL PERFOR A CE CHARACTERISTICS
TEMPERATURE (°C)
–50
10
18
16
14
12
20
22
24
26
28
–25
0
25
50
2927 G05
75
100
TEMPERATURE (°C)
–50
1.210
1.215
1.220
1.225
1.230
1.235
1.240
–25
0
25
50
2927 G04
75
100
TEMPERATURE (°C)
–50
40
45
50
55
60
65
70
–25
0
25
50
2927 G06
75
100
VRAMPBUF(OL) vs Temperature
VRAMPBUF(OH) vs Temperature
VON(TH) vs Temperature



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