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LT8697HUDD#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30
LT8697
1
8697fb
For more information www.linear.com/LT8697
TYPICAL APPLICATION
FEATURES DESCRIPTION
USB 5V 2.5A Output,
42V Input
Synchronous Buck with
Cable Drop Compensation
The LT
®
8697 is a compact, high efficiency, high speed
synchronous monolithic step-down switching regulator
designed to power 5V USB applications. A precise output
voltage and programmable cable drop compensation main
-
tain accurate 5
V regulation at the USB socket connected
to the end of a long cable. Forced continuous operation
allows the LT8697 to sink current, further enhancing ac
-
curate 5V regulation during load transients.
Accurate and programmable output current limit, a power
good indicator pin and an output current monitor pin
improve system reliability and safety, allow the user to
implement latch-off or auto-retry functionality and can
eliminate the need for a USB switch IC. Dual feedback al
-
lows regulation on the output of a USB switch and limits
cable drop compensation to a maximum of 5.8V output,
protecting USB devices during fault conditions. Thermal
shutdown provides additional protection by limiting power
dissipation in the IC during an overtemperature fault.
The LT8697 is available in a small 24-lead 3mm × 5mm
package with an exposed pad for low thermal resistance.
L, LT, LTC , LT M, Linear Technology, the Linear logo and Burst Mode are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective
owners.
2MHz 5V Step-Down Converter with Cable Drop Compensation
APPLICATIONS
n
Wide Input Range: 5V to 42V
n
Low Dropout Under All Conditions: 450mV at 2.1A
n
Accurate 5V Output: ±1.3% Over Full Temperature
Range
n
Programmable Cable Drop Compensation
n
Programmable Output Current Limit
n
Output Current Monitor
n
Dual Input Feedback Permits Regulation on Output
of USB Switch
n
Forced Continuous Mode for Fast Load Step
Response
n
High Efficiency Synchronous Operation at 2MHz:
93% Efficiency at 2.1A, 5V
OUT
from 12V
IN
95% Efficiency at 0.9A, 5V
OUT
from 12V
IN
n
Fast Minimum Switch-On Time: 45ns
n
Adjustable Output from 5.0V to 5.25V
n
Adjustable and Synchronizable: 300kHz to 2.2MHz
n
Small Thermally Enhanced 3mm × 5mm 24-Lead
QFN Package
n
Automotive and Industrial USB
n
Precision 5V Supply
Transient Response Through 3 Meters
AWG 20 Twisted-Pair Cable
EN/UV
PG
INTV
CC
ICTRL
SYNC
TR/SS
RT
SW
SYS
ISP
ISN
USB5V
RCBL
V
IN
V
IN
6V TO 42V
BST
3.3µH
0.018Ω
GND
LT8697
1µF
16.5k
PGND
10nF
4.7µF
0.1µF
47µF
×2
18.2k
0.1Ω
3 METERS AWG 20
TWISTED PAIR CABLE
0.1Ω
10k
1nF
V
OUT
LOAD
8697 TA01a
V
LOAD
5V, 2.4A
+
–
VOLTAGE (V)
CURRENT (A)
5.00
5.25
5.50
8697 TA01b
4.75
4.50
4.25
3
4
5
2
1
0
100µs/DIV
V
OUT
V
LOAD
I
LOAD
50mA/µs
LT8697
2
8697fb
For more information www.linear.com/LT8697
PIN CONFIGURATIONABSOLUTE MAXIMUM RATINGS
V
IN
, EN/UV, PG, ISP, ISN ...........................................42V
SYS ...........................................................................30V
USB5V .....................................................................3mA
BST Above SW ............................................................ 4V
TR/SS, ICTRL..............................................................4V
RT, RCBL .....................................................................2V
SYNC ..........................................................................6V
Operating Junction Temperature Range (Notes 2, 3)
LT8
697E
............................................ –40°C to 125°C
LT8697I
............................................. –40°C to 125°C
LT8697H
............................................ –40°C to 150°C
Storage Temperature Range .................. –65°C to 150°C
(Note 1)
24 23 22 21
9 10
TOP VIEW
25
GND
UDD PACKAGE
24-LEAD (3mm × 5mm) PLASTIC QFN
11 12
6
5
4
3
2
1
15
16
17
18
19
20
SYNC
TR/SS
RT
EN/UV
V
IN
V
IN
PGND
PGND
USB5V
PG
SYS
INTV
CC
BST
SW
SW
SW
ICTRL
RCBL
ISN
ISP
NC
NC
NC
NC
14
7
13
8
θ
JA
= 46°C/W, θ
JC
= 5°C/W
EXPOSED PAD (PIN 25) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT8697EUDD#PBF LT8697EUDD#TRPBF LGGW 24-Lead (3mm × 5mm) Plastic QFN –40°C to 125°C
LT8697IUDD#PBF LT8697IUDD#TRPBF LGGW 24-Lead (3mm × 5mm) Plastic QFN –40°C to 125°C
LT8697HUDD#PBF LT8697HUDD#TRPBF LGGW
24-Lead (3mm × 5mm) Plastic QFN
–40°C to 150°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
PARAMETER CONDITIONS MIN TYP MAX UNIT
V
IN
Undervoltage Lockout
l
2.9 3.4 V
V
IN
Shutdown Current V
EN/UV
= 0.3V
l
1 3
8
µA
µA
V
IN
Current in Regulation V
IN
= 12V, I
LOAD
= 100µA, R
T
= 56.2k
l
9 12 mA
V
IN
to Disable Forced Continuous Mode V
IN
Rising
l
27 29 31 V
Output Sink Current in Forced Continuous Mode V
USB5V
= 5.5V, L = 6.8µH, R
T
= 56.2k 0.6 1 1.7 A
USB5V Voltage V
IN
= 12V
l
4.96
4.91
4.99
4.99
5.02
5.04
V
V
USB5V V
oltage Line Regulation V
IN
= 6V to 42V
l
6 25 mV
Regulated Load Voltage Through 0.3Ω V
IN
= 12V, I
LOAD
= 2.1A, Voltage at Point of Load (End
of Cable), R
CBL
= 13.7k, R
CDC
= 10k, R
SENSE
= 20mΩ
l
4.925 5 5.075 V
USB5V Clamp Voltage I
USB5V
= 3mA 9 V
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Notes 2, 4)
LT8697
3
8697fb
For more information www.linear.com/LT8697
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Notes 2, 4)
PARAMETER CONDITIONS MIN TYP MAX UNIT
USB5V Current
V
ISN
= 5V, V
ISP
– V
ISN
= 40mV, R
CBL
= 13.7k
V
ISN
= 5V, V
ISP
– V
ISN
= 10mV, R
CBL
= 13.7k
V
ISN
= 5V, V
ISP
– V
ISN
= 0V, R
CBL
= 13.7k
R
CBL
= Open
l
l
l
l
57.5
12
0
0
60
15
2
1
62.5
23
8
2
µA
µA
µA
µA
Current Sense V
oltage (V
ISP
– V
ISN
) V
CTRL
= 1.5V, V
ISN
= 5V
V
CTRL
= 1.5V, V
ISN
= 0V
V
CTRL
= 800mV, V
ISN
= 5V
V
CTRL
= 800mV, V
ISN
= 0V
V
CTRL
= 200mV, V
ISN
= 5V
V
CTRL
= 200mV, V
ISN
= 0V
l
l
l
l
l
l
45
43
34.5
34
4.5
3.5
48
48.5
39.5
40
9.5
10
51
54
44.5
46
14.5
16.5
mV
mV
mV
mV
mV
mV
RCBL
Monitor V
oltage V
ISP
– V
ISN
= 40mV, R
CBL
= 13.7k
V
ISP
– V
ISN
= 10mV, R
CBL
= 13.7k
l
l
720
115
800
205
880
305
mV
mV
RCBL Output Current Limit V
ISP
– V
ISN
= 50mV, V
RCBL
= 0V –2 –3 –4 mA
ISP, ISN Bias Current V
ISP
= V
ISN
= 0V, 5V –20 20 µA
ICTRL Current V
ICTRL
= 1.5V –0.5 –2 –3 µA
INTV
CC
Voltage V
SYS
= 0V, 5V 3.4 V
INTV
CC
Undervoltage Lockout 2.6 2.9 3.15 V
SYS Voltage in SYS Regulation V
IN
= 12V
l
5.63 5.8 5.92 V
SYS Voltage to Disable Forced Continuous Mode 7.5 V
SYS Current in Regulation V
SYS
= 5V, R
T
= 56.2k
l
3 4 5 mA
Dropout Voltage (V
IN
– V
SYS
) V
SYS
= 5V, I
LOAD
= 2.1A 450 mV
Maximum Duty Cycle in Dropout 96 97.5 99 %
Minimum On-Time I
LOAD
= 1A
l
30 45 70 ns
Minimum Off-Time I
LOAD
= 0.5A 80 110 ns
Minimum V
IN
for SYS Regulation at Full Frequency R
T
= 16.5k, V
USB5V
= 0V, I
LOAD
= 0.5A 6.2 7 7.9 V
Oscillator Frequency R
T
= 140k
R
T
= 56.2k
R
T
= 16.5k
l
l
l
250
620
1.85
300
700
2.00
340
750
2.05
kHz
kHz
MHz
Top Power NMOS On-Resistance I
SW
= 1A 120 mΩ
Top Power NMOS Current Limit E-, I-Grades
H-Grade
l
l
3.2
2.9
4.8
4.8
6
6
A
A
Bottom Power NMOS On-Resistance V
INTVCC
= 3.4V, I
SW
= 1A 65 mΩ
Bottom Power NMOS Current Limit V
INTVCC
= 3.4V 3.5 4.5 5.8 A
SW Leakage Current V
IN
= 42V, V
SW
= 0V, 42V 0.1 5 µA
EN/UV Threshold V
EN/UV
Rising
l
0.94 1.0 1.06 V
EN/UV Hysteresis 40 mV
EN/UV Bias Current V
EN/UV
= 2V –20 20 nA
PG Upper Threshold Offset from V
USB5V
V
USB5V
Falling
l
6 9 12 %
PG Lower Threshold Offset from V
USB5V
V
USB5V
Rising
l
–6 –9 –12 %
PG Hysteresis 1.3 %
PG Pull-Down Resistance V
PG
= 0.1V
l
680 2000 Ω
PG Transition Delay V
USB5V
from 5V to 4V 40 µs
SYNC Threshold V
SYNC
Falling
V
SYNC
Rising
0.8
1.6
1.1
2.0
1.4
2.4
V
V
SYNC Pin Current V
SYNC
= 2V –1 1 µA
TR/SS Current V
TR/SS
= 0V –1.2 –2.2 –3.2 µA
TR/SS Pull-Down Resistance Fault Condition, V
TR/SS
= 0.1V 230 Ω
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LT8697HUDD#PBF

Mfr. #:
Buy LT8697HUDD#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators USB 5V 2.5A Output, 42V Inpuut Synchronous Step-Down Regulator with Cable Drop Compensation
Lifecycle:
New from this manufacturer.
Delivery:
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