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PDF LT3669-2 Data sheet ( Hoja de datos )
| Número de pieza | LT3669-2 | |
| Descripción | IO-Link Transceiver | |
| Fabricantes | Linear Technology Corporation | |
| Logotipo |  |
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Features
n IO-Link® PHY Compatible (COM1/COM2/COM3)
n Cable Interface Protected to ±60V
n Operation from 7.5V to 40V
n Integrated Step-Down Switching Regulator
n Max Load Current: 100mA (LT3669)/
300mA (LT3669-2)
n Synchronizable and Adjustable Switching
Frequency: 250kHz to 2.2MHz
n Output Voltage: 0.8V to 16V
n Integrated 150mA LDO Linear Regulator
n Rugged Line Drivers with Adjustable Slew Rate and
Current Limit
n Adaptive Line Driver Pulsing Scheme to Switch
Heavy Loads Safely
n Drivers Configurable as Push-Pull, Pull-Up or
Pull-Down
n Adjustable Power-On Reset Timer
n Small 28-Pin Thermally Enhanced 4mm × 5mm
QFN Package
Applications
n Industrial Sensors and Actuators
LT3669/LT3669-2
IO-Link Transceiver with
Integrated Step-Down
Regulator and LDO
Description
The LT®3669 is an industrial transceiver that includes a
step-down switching regulator and a low dropout linear
regulator. Wake-up detect functionality, as well as a pro-
grammable power-on reset timer are also included. The
current limit and slew rate of the transmitters are externally
adjustable for optimum EMC performance.
The line drivers can source/sink up to 250mA of current
each or 500mA when connected together, with a minimal
residual voltage of less than 2.1V. An internal adaptive
pulsing scheme allows the drivers to safely switch heavy
capacitive loads and incandescent bulbs. Thermal shut-
down provides additional protection. Line protection of
±60V in the line interface pins allows the use of standard
TVS diodes with L+ operating voltages up to 40V.
The switching regulator integrates the catch diode in
LT3669 (up to 100mA load current) and requires an exter-
nal catch diode in LT3669-2 (up to 300mA load current).
The LT3669 implements an IO-Link device PHY. For IO-Link
master designs, see the LTC2874.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and Hot Swap
is a trademark of Linear Technology Corporation. IO-Link is a registered trademark of PROFIBUS
User Organization (PNO). All other trademarks are the property of their respective owners.
Typical Application
82µH
0.1µF
RESET
I/O
I/O
µC
I/O
I/O
I/O
I/O
I/O
I/O
LT3669
BD FBOUT
LDOIN
SW CPOR
BST
SYNC
SR
RT
ILIM
RST LDO
SC1 FBLDO
SC2 AGND
WAKE
RXD1
DIO
TXEN1 EN/UVLO
TXD1
L+
TXEN2
Q2
TXD2 GND CQ1
53.6k
0.1µF 10.2k
5V
100mA
10µF
38.3k
tRST = 12.5ms
fSW = 600kHz
42.2k
14k
4.42k
3.3V
100mA
1µF
470pF
470pF
VL+, 7.5V TO 40V
TRANSIENT TO 60V
250mA
250mA
4.7µF
2
1
4
3
36692 TA01a
Operating Waveforms
TXD1
5V/DIV
RXD1
5V/DIV
CQ1
5V/DIV
10µs/DIV
(RXD1 PULL-UP RESISTOR = 10k)
0V
0V
0V
36692 TA01b
For more information www.linear.com/LT3669
3669f
1
1 page  
LT3669/LT3669-2
E lectrical Characteristics The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C, VL+ = 24V, VEN/UVLO = 24V. (Note 4)
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX
Digital IO
WAKE, RXD1, SCn Pull-Down Output Current VSCn = VWAKE = VRXD1 = 0.3V
if Asserted
l 0.7
1.05
RST Pull-Down Output Current if Asserted
VRST = 0.3V
VIH TXDn, TXENn, SR Input High Voltage
VIL TXDn, TXENn, SR Input Low Voltage
ILK TXDn, TXENn, SR Pin Input Leakage Current
CIN TXDn, TXENn, SR Pin Input Capacitance
l 0.2
0.3
l 0.9
l 0.4
0.1 1
2.5
UNITS
mA
mA
V
V
µA
pF
S witching Characteristics The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C, VL+ = 24V, VEN/UVLO = 24V. (Note 4)
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX
Driver and Receiver
fDTR
tBIT
Driver
Maximum Data Transfer Rate
Bit Time
CCQ1,Q2 ≤ 4nF
VVSSRR
≤
≥
0.4V
0.9V
(for
(for
COM1/COM2)
COM3)
VVSSRR
≤
≥
0.4V
0.9V
(for
(for
COM2)
COM3)
l 38.4
l 230.4
26.04
4.34
tDR
tDF
tPHLD, tPLHD
tSKEWD
tZHD, tZLD
tHZD, tLZD
tDWU
Rise Time
Fall Time
Propagation Delay
Skew
Enable Time
Disable Time
Minimum Wake-Up Pulse Duration to
Be Acknowledged
CCQV1S,QR2≤≤04.4nVF
(Figure 1)
(for COM1/COM2)
VSR ≥ 0.9V (for COM3)
CCQ1,Q2 ≤ 4nF (Figure 1)
VSR ≤ 0.4V (for COM1/COM2)
VSR ≥ 0.9V (for COM3)
CCQ1,Q2 ≤ 4nF (Figure 2)
VSR ≤ 0.4V (for COM1/COM2)
VSR ≥ 0.9V (for COM3)
tSKEWD = |tPHLD – tPLHD|, CCQ1,Q2 ≤ 4nF (Figure 2)
VVSSRR
≤
≥
0.4V
0.9V
(for
(for
COM1/COM2)
COM3)
CCQV1S,QR2≤=01.40V0p(Ffo, rRCPUOM= 1R/PCDO=M120)k (Figure 3)
VSR ≥ 0.9V (for COM3)
CCQ1,Q2 = 100pF, RPU = RPD = 10k (Figure 3)
VSR ≤ 0.4V (for COM1/COM2)
VSR ≥ 0.9V (for COM3)
RPU = RPD = 10k (Figure 7)
WAKE Pull-Up Resistor = 5k
l
l
l
l
l
l
l
l
l
l
l
l
l
1.6 5.2
0.26 0.869
2.1 5.2
0.34 0.869
3.3 6
0.72 1.3
0.25 1.5
140 400
3.4 6.1
0.8 1.4
46
46
55 75
tLZW
Delay From Handshake Sequence
WAKE Pull-Up Resistor = 5k
Finished to WAKE High (Note 9)
0.3 1
Pulsing On-Time
Pulsing Off-Time
VRQH (VRQL) = 24V, Only CQ1 or Q2 Pulsing
320
2.2
UNITS
kb/s
kb/s
µs
µs
µs
µs
µs
µs
µs
µs
µs
ns
µs
µs
µs
µs
µs
µs
µs
ms
For more information www.linear.com/LT3669
3669f
5
5 Page 
Typical Performance Characteristics
Receiver Thresholds
13
12 VTHH
11
10 VTHL
9
8
7
6
5
4
3
2
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
36692 G36
Receiver Thresholds
13
12 VTHH
11
10 VTHL
9
8
7
6
5
4
3
2
5 10 15 20 25 30
VL+ (V)
35 40
36692 G37
LT3669/LT3669-2
CQ1, Q2 Pin Leakage Current
VTXEN < 0.4V
4.0
VL+ :
3.5
18V
24V
30V
3.0 40V
2.5
2.0
1.5
1.0
0.5
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
36692 G38
Line Driver Current Limit
400
350 RILIM = 42.2kΩ
300
250
200
150 VILIM ≤ 0.3V
100
50
0
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
36692 G39
Line Driver Pulsing On-Time/
Off-Time
2.4
2.2 PULSING OFF-TIME
2.0
1.8
1.6
1.4
1.2
1.0
PULSING ON-TIME, VRQH,L = 5V
0.8
0.6
0.4
0.2
0
–50
PULSING ON-TIME, VRQH,L = 24V
PULSING ON-TIME, VRQH,L = 40V
–25 0 25 50 75 100 125 150
TEMPERATURE (°C)
36692 G42
Line Driver Residual Voltage
1.8
VRQH
VRQL
1.6
IQ = ±250mA
1.4
1.2
1.0 IQ = ±100mA
0.8
0.6
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
36692 G40
Line Driver Residual Voltage
1.6
1.4
1.2 VRQL
1.0 VRQH
0.8
0.6
0.4
0.2
0
0 25 50 75 100 125 150 175 200 225 250
LINE DRIVER SOURCE/SINK CURRENT (mA)
36692 G41
Line Driver Pulsing On-Time/
Off-Time
2.4
2.2 PULSING OFF-TIME
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6 PULSING ON-TIME
0.4
0.2
0 PULSING NOT OCCURRING BELOW 3V
0 5 10 15 20 25 30 35
40
RESIDUAL VOLTAGE, VRQH,L (V) 36692 G43
Line Driver Output Waveforms
VTXD1
5V/DIV
VRXTD1
5V/DIV
0V
0V
VCQ1
5V/DIV
0V
2µs/DIV
VSR > 0.9V, RXD1 PULL-UP RESISTOR = 10k
36692 G44
For more information www.linear.com/LT3669
3669f
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet LT3669-2.PDF ] | |
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