LTC2921CGN データシートの表示（PDF） - Linear Technology
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LTC2921CGN Datasheet PDF : 20 Pages
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LTC2921/LTC2922 Series
APPLICATIO S I FOR ATIO
∆VL0
=
–0.8A
• 150mΩ
•
10Ω
100Ω
=
–12mV
= –0.24%of 5V
∆VL1 = –1.6A •150mΩ • 11000ΩΩ = –24mV
= –0.73%of 3.3V
∆VL2
=
–0.4A
• 150mΩ
•
10Ω
100Ω
=
–6mV
= –0.24%of 2.5V
Confirm that the currents through the remote sense
switches are less than the Absolute Maximum Ratings:
IDS1
=
0.8A
•
150mΩ
100Ω
=
1.2mA
IDS2
=
1.6A
•
150mΩ
100Ω
=
2.4mA
IDS3
=
0.4A
•
150mΩ
100Ω
=
0.6mA
The pull-down transistor Q5 on the V1 pin is a circuit
breaker reset mechanism. Choose the transistor to pull
down VV1 below the reset threshold under worst-case
conditions, and choose a gate-grounding resistor based
on speed and current considerations. The Vishay Siliconix
Si1012R and a 100k resistor proved sufficient for this
design. Finally, bypass the VCC pin with a 10µF capacitor.
TYPICAL APPLICATIO S
VOUT 3.3V± 10%
VFB
DC/DC
CONVERTER
VOUT 2.5V ± 5%
VFB
DC/DC
CONVERTER
VOUT
VFB
1.8V ± 5%
DC/DC
CONVERTER
VOUT 1.5V ± 5%
VFB
DC/DC
CONVERTER
VOUT 1.2V ± 5%
VFB
DC/DC
CONVERTER
QRST
Si1012R
CBRST
R1
100k
CIRCUIT BREAKER
RESET CONTROL
Five-Supply Tracker and Monitor (3.3V, 2.5V, 1.8V, 1.5V, 1.2V)
RX0
100Ω
RSENSE
WSL1206
0.05Ω, 1%
CD0
0.1µF
25V
Q0
Si2316DS
RG0
10Ω
RX1
100Ω
CD1
0.1µF
25V
Q1
Si2316DS
RG1
10Ω
RX2
100Ω
RX3
100Ω
CD2
0.1µF
25V
CD3
0.1µF
25V
Q2
Si2316DS
RG2
10Ω
Q3
Si2316DS
RG3
10Ω
RX4
100Ω
RB1
178k
1%
RA1
49.9k
1%
RB2
113k
1%
RB3
86.6k
1%
RA2
49.9k
1%
RA3
49.9k
1%
RB4
60.4k
1%
RA4
49.9k
1%
CBYP
10µF
25V
3
4
V1
V2
5 V3
6 V4
CD4
0.1µF
25V
19
18
VCC SENSE 17
GATE
16
PG
LTC2922-3.3
1 S0
13 S1
11 S2
9 S3
7 S4
GND
15
D0 20
D1 14
D2 12
D3 10
D4 8
TIMER
2 CTIMER
0.22µF
10V
Q4
Si2316DS
RG4
10Ω
CGATE
0.47µF
25V
18
3.3V
LOAD
0.8A MAX
2.5V
LOAD
2.3A MAX
1.8V
LOAD
1.6A MAX
1.5V
LOAD
1.4A MAX
1.2V
LOAD
1.2A MAX
R2
4.7k
RESET
PG PIN AS RESET
WITH PULL-UP
TO 2.5V
2921/22 TA02
29212fa
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