OMO ElectronicOMO Electronic
Expand menu
Hello, Sign inMy Account
0 Cart

LTC1695CS5#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20
LTC1695
16
Table 4 lists some 5V brushless DC fans suitable for typical
LTC1695 fan speed control applications. Figure 5 shows
the measured I-V characteristics of these fans. For a
particular fan selection, users must determine the mini-
mum DAC output voltage code below which the fan stalls.
Most fans continue to consume current, even in a stalled
condition.
Table 4. Some 5V DC Fans’ Characteristics
Manufacturer Part Number Airflow Power Size
(CFM) (W) (L • W • H)mm
3
SUNON KDE0501PFB2-8 0.65 0.50 20 • 20 • 10
ATC AD0205HB-G51 0.80 0.45 25 • 25 • 10
SUNON KDE0502PFB2-8 1.70 0.60 25 • 25 • 10
SUNON KDE0503PFB2-8 3.20 0.60 30 • 30 • 10
SUNON KDE0535PFB2-8 4.80 0.70 35 • 35 • 10
Micronel F41MM-005XK-9 6.10 0.70 40 • 40 • 12
DC FAN SELECTION
The LTC1695, in the 5-lead SOT-23 package, caters mainly
to 5V brushless DC fans, in spot cooling and notebook
computer applications, that consume less than 1W maxi-
mum. These applications typically require fan footprints
on the order of 4000mm
3
to 20000mm
3
.
Such fan sizes
are common and commercially available. Examples of
these miniature fans are the “Ultra-thin DC fan” and
“Extra-mini DC fan” from SUNON Inc. Models in these
series range from 17mm to 40mm in size, weigh from 4
grams to 10 grams and provides airflow densities from
0.65 CFM to 6 CFM.
Users must consider parameters like physical size
(L • W • H), airflow (CFM), power dissipation (W) and
acoustically generated noise (dBA) when choosing a fan.
Users must also evaluate the fan’s I-V characteristics
versus fan speed and the start/stall characteristics of the
fan. Other factors include mechanical considerations such
as low cost sleeve bearings or ball bearings that have
better long term reliability. Finally, users must consider if
the fan requires any input protection features such as
reverse-voltage protection. All of these factors affect the
fan’s cost.
Table 3 lists some 5V fan manufacturer’s contact informa-
tion.
Table 3. 5V DC Fan Manufacturers
Manufacturer Address
SUNON Inc. 1075 W. Lambert Rd., Brea, CA 92821
Tel: (714)255-0208
Website: http://www.sunon.com
Advanced Technology 1280 Liberty Way, Vista, CA 92083
Company Tel: (760)727-7430
Nidec America 152 Will Dr., Canton, MA 02021
Tel: (781)828-6216
Website: http://nidec.com
NMB Technologies Inc. 9730 Independence Ave., Chatsworth, CA 91311
Tel: (818)341-3355
Website: http://www.nmbtech.com
Micronel 1280 Liberty Way, Vista, CA 92083
Tel: (760)727-7400
Website: http://www.micronel.com
TERMINAL VOLTAGE (V)
0
CURRENT (mA)
150
125
100
75
50
25
0
1
234
1695 • F05
5
T
A
= 25°C
KDE0501PFB2-8
KDE0535PFB2-8
KDE0502PFB2-8
AD0205HB-G51
KDE0503PFB2-8
F41MM-005XK-9
Figure 5. I-V Characteristics of 5V
Brushless DC Fan Samples
APPLICATIONS INFORMATION
WUU
U
LTC1695
17
SMBus Data Byte Table (Receive Byte Protocol)
DECIMAL BINARY HEX LTC1695 Status
MSB LSB
0 00000000 00 No Fault
128 10000000 80 Overcurrent Fault/Clamp
64 01000000 40 Thermal Shutdown
During thermal shutdown, the LTC1695’s LDO is shut off.
DECIMAL BINARY HEX Nominal V
OUT
(V)
(D5 to D0) MSB LSB (D6-D7 set to 0) I
LOAD
= 1mA
32 X0100000 20 2.500
33 X0100001 21 2.578
34 X0100010 22 2.656
35 X0100011 23 2.734
36 X0100100 24 2.813
37 X0100101 25 2.891
38 X0100110 26 2.969
39 X0100111 27 3.047
40 X0101000 28 3.125
41 X0101001 29 3.203
42 X0101010 2A 3.281
43 X0101011 2B 3.359
44 X0101100 2C 3.438
45 X0101101 2D 3.516
46 X0101110 2E 3.594
47 X0101111 2F 3.672
48 X0110000 30 3.750
49 X0110001 31 3.828
50 X0110010 32 3.906
51 X0110011 33 3.984
52 X0110100 34 4.063
53 X0110101 35 4.141
54 X0110110 36 4.219
55 X0110111 37 4.297
56 X0111000 38 4.375
57 X0111001 39 4.453
58 X0111010 3A 4.531
59 X0111011 3B 4.609
60 X0111100 3C 4.688
61 X0111101 3D 4.766
62 X0111110 3E 4.844
63 X0111111 3F 4.922
D6 = 0 disables the boost start timer.
D7 = X = don’t care
SMBus Address Byte Table
Decimal HEX SMBus Protocol
232 E8 Send Byte to the LTC1695
233 E9 Receive Byte from the LTC1695
The LSB of the SMBus address is the write bit. For send byte protocol,
W = 0. For Receive byte protocol, W = 1
SMBus Command Byte Table (Send Byte Protocol)
DECIMAL BINARY HEX Nominal V
OUT
(V)
(D5 to D0) MSB LSB (D6-D7 set to 0) I
LOAD
= 1mA
0 X0000000 00 0.000
1 X0000001 01 0.078
2 X0000010 02 0.156
3 X0000011 03 0.234
4 X0000100 04 0.313
5 X0000101 05 0.391
6 X0000110 06 0.469
7 X0000111 07 0.547
8 X0001000 08 0.625
9 X0001001 09 0.703
10 X0001010 0A 0.781
11 X0001011 0B 0.859
12 X0001100 0C 0.938
13 X0001101 0D 1.016
14 X0001110 0E 1.094
15 X0001111 0F 1.172
16 X0010000 10 1.250
17 X0010001 11 1.328
18 X0010010 12 1.406
19 X0010011 13 1.484
20 X0010100 14 1.563
21 X0010101 15 1.641
22 X0010110 16 1.719
23 X0010111 17 1.797
24 X0011000 18 1.875
25 X0011001 19 1.953
26 X0011010 1A 2.031
27 X0011011 1B 2.109
28 X0011100 1C 2.188
29 X0011101 1D 2.266
30 X0011110 1E 2.344
31 X0011111 1F 2.422
D6 = 0 disables the boost start timer.
D7 = X = don’t care
APPLICATIONS INFORMATION
WUU
U
LTC1695
18
APPLICATIONS INFORMATION
WUU
U
SMBus Command Byte Table (Boost Start Timer Enabled)
DECIMAL BINARY HEX Nominal V
OUT
(V)
(D5 to D0) MSB LSB (D7 set to 0)
LOAD
= 1mA
0 X1000000 40 0.000
1 X1000001 41 0.078
2 X1000010 42 0.156
3 X1000011 43 0.234
4 X1000100 44 0.313
5 X1000101 45 0.391
6 X1000110 46 0.469
7 X1000111 47 0.547
8 X1001000 48 0.625
9 X1001001 49 0.703
10 X1001010 4A 0.781
11 X1001011 4B 0.859
12 X1001100 4C 0.938
13 X1001101 4D 1.016
14 X1001110 4E 1.094
15 X1001111 4F 1.172
16 X1010000 50 1.250
17 X1010001 51 1.328
18 X1010010 52 1.406
19 X1010011 53 1.484
20 X1010100 54 1.563
21 X1010101 55 1.641
22 X1010110 56 1.719
23 X1010111 57 1.797
24 X1011000 58 1.875
25 X1011001 59 1.953
26 X1011010 5A 2.031
27 X1011011 5B 2.109
28 X1011100 5C 2.188
29 X1011101 5D 2.266
30 X1011110 5E 2.344
31 X1011111 5F 2.422
D6 = 1 enables the boost start timer.
D7 = X = don’t care
DECIMAL BINARY HEX Nominal V
OUT
(V)
(D5 to D0) MSB LSB (D7 set to 0) I
LOAD
= 1mA
32 X1100000 60 2.500
33 X1100001 61 2.578
34 X1100010 62 2.656
35 X1100011 63 2.734
36 X1100100 64 2.813
37 X1100101 65 2.891
38 X1100110 66 2.969
39 X1100111 67 3.047
40 X1101000 68 3.125
41 X1101001 69 3.203
42 X1101010 6A 3.281
43 X1101011 6B 3.359
44 X1101100 6C 3.438
45 X1101101 6D 3.516
46 X1101110 6E 3.594
47 X1101111 6F 3.672
48 X1110000 70 3.750
49 X1110001 71 3.828
50 X1110010 72 3.906
51 X1110011 73 3.984
52 X1110100 74 4.063
53 X1110101 75 4.141
54 X1110110 76 4.219
55 X1110111 77 4.297
56 X1111000 78 4.375
57 X1111001 79 4.453
58 X1111010 7A 4.531
59 X1111011 7B 4.609
60 X1111100 7C 4.688
61 X1111101 7D 4.766
62 X1111110 7E 4.844
63 X1111111 7F 4.922
D6 = 1 enables the boost start timer.
D7 = X = don’t care
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20

LTC1695CS5#TRPBF

Mfr. #:
Buy LTC1695CS5#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Motor / Motion / Ignition Controllers & Drivers SMBus/I2C Fan Speed Cntr in SOT-23
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
T/T Paypal Visa MoneyGram Western Union

Products related to this Datasheet