LTC1840 LINER [Linear Technology], LTC1840 Datasheet - Page 12

• Manufacturer Part Number: LTC1840
• Description: Dual Fan Controller with 2-Wire Interface
• Manufacturer: LINER [Linear Technology]

LTC1840
TYPICAL APPLICATIO
No R
12
RELATED PARTS
PART NUMBER
LTC1625
LTC1695
LTC1694/LTC1694-1
LTC1771
LTC4300-1
FAULT
SENSE
TO AUTOMATICALLY MUX TACHB BETWEEN THE
SDA
SCL
TWO PARALLEL FANS, SET GPIO2 TO BLINK
10k
10k
L1 = SUMIDA CDRH125-15OMC
C
R1, R2 = 1% METAL FILM
3.3V
IN
and ThinSOT are trademarks of Linear Technology Corporation.
, C
130
LED1
(8 OTHERS POSSIBLE)
ADDRESS = 1110010
OUT
-A-
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] FAX: [phone]
, = PANASONIC EEV-FC1C471P
NC
NC
1
2
3
4
5
6
7
8
SCL
SDA
A1
A0
FAULT
GPIO1
GPIO2
GND
LTC1840
LTC1840
3.3V
DESCRIPTION
No R
Switching Regulator
SMBus/I
SMBus Accelerator
Ultralow Supply Current Step-Down DC/DC Controller
Hot Swappable 2-Wire Bus Buffer
I
I
DACOUTA
DACOUTB
TACHB
TACHA
BLAST
GPIO4
GPIO3
V
SENSE
CC
12V
16
15
14
13
12
11
10
9
2
C Fan Speed Controller in ThinSOT
SYSTEM
RESET
TM
+
0.1 F
10 F
Current Mode Synchronous Step-Down
10k
TN0205A
U
Controlling Fan Pair with Automatic Blast Redundancy
and Fan Pair with Automatic Tach Muxing
+
+
IN4148
www.linear.com
C
470 F
C
470 F
IN1B
CC1B
470pF
CF1B
100pF
IN1
CC1
470pF
CF1
100pF
10k
10k
+
+
CC2B
220pF
CC2
220pF
C
470 F
C
470 F
IN2B
IN2
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
EXTV
SYNC
RUN/SS
FCB
I
SGND
V
V
EXTV
SYNC
RUN/SS
FCB
I
SGND
V
V
TH
TH
OSENSE
PROG
OSENSE
PROG
TM
LTC1625
LTC1625
CC
CC
INTV
INTV
B00ST
B00ST
PGND
PGND
SW
SW
V
V
TG
BG
TG
BG
TK
TK
CC
CC
IN
IN
16
15
14
13
12
11
10
9
16
15
14
13
12
11
10
9
+
+
CBB, 0.22 F
CB, 0.22 F
4.7k
4.7k
COMMENTS
1.19V V
0.75 PMOS Linear Regulator with 180mA Output Current Rating
Includes DC and AC Pull-Up Current/AC Pull-Up Current Only
1.23V V
Bidirectional Bus Buffer; Isolates Backplane and Card Capacitance
CMDSH-3
CMDSH-3
Up to 97% Efficiency; 1.19V V
10 A Supply Current; 93% Efficiency;
Prevents SDA, SCL Corruption During Live Insertion;
CV
4.7 F
CV
4.7 F
CCB
CC
Si4410DY
Si4410DY
Si4410DY
Si4410DY
MBRS140T3
MBRS140T3
OUT
OUT
15 H
15 H
L1B
L1
CV
0.1 F
CV
0.1 F
INB
IN
V
18V; 2.8V V
(4.5V TO 12V)
75k
27k
R1
R2
IN
; Up to 99% Duty Cycle
470 F
C
R1B
75k
R2B
27k
OUT1
+
2
+
C
470 F
OUT1B
2
IN
10k
3.3V
2- NMB 5920PL-04W-B29-D50 FANS
IN
-A-
LINEAR TECHNOLOGY CORPORATION 2001
DC
FAN
(4.5V TO 12V)
TACH
OUT
20V; Up to 100% Duty Cycle
36V;
2- NMB 5910PL-04W-B59-D50 FANS
10k
2.2A NOM AT 12V
DC
FAN
TACH
OUT
LT/TP 0402 2K • PRINTED IN USA
BYS10-25
DC
FAN
2.1A NOM AT 12V
DC
FAN
TP0101TS
TACH
TACH
OUT
OUT
1840 TA03
10k
3.3V
1840f