LT8698S/LT8698S-1
5V 3A Output, 42V Input USB Charger with
Cable Drop Compensation and Dataline Protection
FEATURES
DESCRIPTION
The LT®8698S is a compact, high efficiency, synchronous
monolithic step-down switching regulator designed to
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Wide V Range Up to 42V
IN
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Programmable Cable Drop Compensation Provides
Accurate 5V Regulation to Remote USB Sockets
High Speed USB 2.0 Compliant Dataline Switches
Selectable Charger Profiles Including Major
Vendors’ and USB BC 1.2 Profiles
power the 5V USB V
rail with up to 3A from an input
BUS
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voltage as high as 42V. Programmable cable drop com-
pensation maintains accurate 5V V regulation even for
BUS
USB sockets separated from the LT8698S by a long cable
such as an automobile wiring harness. Silent Switcher
Technology and selectable spread-spectrum modulation
provide ultralow EMI/EMC.
Silent Switcher®2 Technology and Selectable Spread-
Spectrum Modulation Provide Ultralow EMI
Robust Dataline Protection
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n
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Tolerant of Short Condition Up to 20V
The LT8698S supports a wide variety of portable device
charger profiles including USB BC 1.2 CDP, DCP, and SDP
as well as common proprietary profiles. Integrated V
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ESD Protected Up to IEC61000-4-2 8kV
Contact Discharge and 15kV Air Discharge
Available Status and Fault Output Pins
Programmable and Synchronizable Switching
Frequency 300kHz to 3MHz
Selectable Forced Continuous or Pulse-Skipping Modes
Small 4mm × 6mm × 0.94mm LQFN Package with
BUS
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reset and V
regulator disable functions support USB
BUS
OTG functionality.
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The LT8698S’s robust high speed USB 2.0 data line
switches protect the upstream USB host µController
from short-circuit conditions up to 20V and ESD events
up to IEC61000-4-2 8kV contact discharge and 15kV air
0.75mm Spacing from V to GND Pins
AEC-Q100 Qualified for Automotive Applications
IN
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discharge levels. Further V
monitor and fault protec-
BUS
tion features eliminate the need for a USB power switch.
The LT8698S includes two parallel 10nF capacitors from
IN
APPLICATIONS
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Automotive USB
V
to PGND for improved EMI/EMC performance. The
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Industrial USB
LT8698S-1 does not include these capacitors.
All registered trademarks and trademarks are the property of their respective owners.
TYPICAL APPLICATION
Automotive Charger with High Speed Dataline Protection and Cable Drop Compensation
USB BC1.2 CDP Session
V
IN
6V TO 42V
V
IN
EN/UV
SW
INTV
CC
LT8698S
ꢀ
BUS
ꢀ.ꢁꢂꢃꢄꢅꢂ
ꢀꢁꢂꢃ
ꢀAꢁꢂꢃꢄ
FLT
STATUS
OUT/ISP
BUS/ISN
USB5V
HIGH SPEED
USB 2.0 HOST
µCONTROLLER
3 METER
USB
USB CABLE
SOCKET
SEL1-3
0.1Ω
ꢁ
ꢂ
V
D
BUS
ꢀ ꢂ ꢀ
+
+
–
+
LD
D
D
+
ꢀꢁꢂꢃꢄꢁ
HD
–
–
–
D
LD
HD
0.1Ω
CLAMP
GND PGND
RCBL
RT
ꢀꢁAꢁꢂꢀ
ꢀꢁꢂꢃꢄꢁ
GND
ꢀꢁꢂꢀꢃ ꢄAꢅꢆꢇ
IMON
ꢀꢁꢁꢂꢃꢄꢅꢆꢇ
8698S TA01
Rev. A
1
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