1840 查看數據表（PDF） - Linear Technology
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1840 Datasheet PDF : 12 Pages
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LTC1840
TYPICAL APPLICATIO
Controlling Fan Pair with Automatic Blast Redundancy
and Fan Pair with Automatic Tach Muxing
12V
L1 = SUMIDA CDRH125-15OMC
CIN, COUT, = PANASONIC EEV-FC1C471P
R1, R2 = 1% METAL FILM
+
+
CIN1B
CIN2B
470µF
470µF
LTC1625
4.7k
1
EXTVCC
VIN 16
10k
2
SYNC
TK 15
CVINB
0.1µF
IN4148
TN0205A
10k
CC1B
470pF
3 RUN/SS SW 14
Si4410DY
L1B
4 FCB
TG 13
CBB, 0.22µF
15µH
5
CC2B ITH
B00ST 12
MBRS140T3
220pF 6 SGND INTVCC 11 CMDSH-3
CF1B
100pF
7
VOSENSE
8
VPROG
BG
PGND
10
+
9
CVCCB
4.7µF
Si4410DY
3.3V
+
+
LTC1840
0.1µF
CIN1
CIN2
470µF
470µF
LTC1625
4.7k
1
16
SCL
SCL
VCC
+
1 EXTVCC
VIN 16
CVIN
2
15 10µF
SDA
SDA IDACOUTA
2 SYNC
TK 15
0.1µF
(4.5V TO 12V)
TP0101TS
3.3V
R1B
75k
+ COUT1B
470µF
R2B ×2
27k
3.3V
DC
DC
10k
FAN
FAN
TACH
OUT
TACH
OUT
2- NMB 5910PL-04W-B59-D50 FANS
2.1A NOM AT 12V
10k
10k
-A-
10k
FAULT
130Ω
LED1
3.3V
10k -A-
3
NC A1
14
IDACOUTB
4
NC A0
5
FAULT
BLAST 13 SYSTEM
RESET
12
TACHB
6
11
GPIO1 TACHA
7
10
GPIO2 GPIO4
8
GND
9
GPIO3
10k
CC1
470pF
CF1
100pF
3 RUN/SS SW
4 FCB
TG
CC2 5 ITH
220pF 6 SGND
B00ST
INTVCC
7 VOSENSE
BG
8 VPROG PGND
14
13
CB, 0.22µF
12
11 CMDSH-3
10
+
9
CVCC
4.7µF
Si4410DY
L1
15µH (4.5V TO 12V)
MBRS140T3 R1
75k
Si4410DY
R2
27k
COUT1 +
470µF
×2
BYS10-25
DC
DC
FAN
FAN
TACH
OUT
TACH
OUT
ADDRESS = 1110010
(8 OTHERS POSSIBLE)
TO AUTOMATICALLY MUX TACHB BETWEEN THE
TWO PARALLEL FANS, SET GPIO2 TO BLINK
2- NMB 5920PL-04W-B29-D50 FANS
2.2A NOM AT 12V
1840 TA03
RELATED PARTS
PART NUMBER
LTC1625
LTC1695
LTC1694/LTC1694-1
LTC1771
DESCRIPTION
No RSENSETM Current Mode Synchronous Step-Down
Switching Regulator
SMBus/I2C Fan Speed Controller in ThinSOTTM
SMBus Accelerator
Ultralow Supply Current Step-Down DC/DC Controller
LTC4300-1
Hot Swappable 2-Wire Bus Buffer
No RSENSE and ThinSOT are trademarks of Linear Technology Corporation.
COMMENTS
Up to 97% Efficiency; 1.19V ≤ VIN ≤ 36V;
1.19V ≤ VOUT ≤ VIN; Up to 99% Duty Cycle
0.75Ω PMOS Linear Regulator with 180mA Output Current Rating
Includes DC and AC Pull-Up Current/AC Pull-Up Current Only
10µA Supply Current; 93% Efficiency;
1.23V ≤ VOUT ≤ 18V; 2.8V ≤ VIN ≤ 20V; Up to 100% Duty Cycle
Prevents SDA, SCL Corruption During Live Insertion;
Bidirectional Bus Buffer; Isolates Backplane and Card Capacitance
12 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 q FAX: (408) 434-0507 q www.linear.com
1840f
LT/TP 0402 2K • PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 2001
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