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LTC3246 데이터시트(HTML) 1 Page - Analog Devices

부품명 LTC3246
상세내용  Wide VIN Range Buck-Boost Charge Pump with Watchdog Timer
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LTC3246 데이터시트(HTML) 1 Page - Analog Devices

 
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LTC3246
1
3246fa
For more information www.linear.com/LTC3246
TYPICAL APPLICATION
FEATURES
DESCRIPTION
Wide VIN Range
Buck-Boost Charge Pump
with Watchdog Timer
The LTC®3246 is a switched capacitor buck-boost DC/DC
converter with integrated watchdog timer. The device
produces a regulated output (3.3V, 5V or adjustable) from
a 2.7V to 38V input. Switched capacitor fractional conver-
sion is used to maintain regulation over a wide range of
input voltage. Internal circuitry automatically selects the
conversionratiotooptimizeefficiencyasinputvoltageand
load conditions vary. No inductors are required.
The LTC3246’s reset time and watchdog timeout may
be set without external components, or adjusted using
external capacitors. A windowed watchdog function is
used for high reliability applications. The reset input can
be used for additional supply monitoring or be configured
as a pushbutton reset.
Low operating current (20µA without load, 1.5µA in shut-
down) and low external parts count make the LTC3246
ideally suited for low power, space constrained automo-
tive/industrial applications. The device is short-circuit and
overtemperature protected and is available in a thermally
enhanced 16-lead MSOP package.
Regulated 5V Output with Pushbutton Reset
Output Voltage vs Input Voltage
n
2.7V – 38V Operating Range (42V Abs Max)
n
IQ = 20µA Operating, 1.5µA in Shutdown
n
Multimode Buck-Boost Charge Pump (2:1, 1:1, 1:2)
with Automatic Mode Switching
n
12V to 5V Efficiency = 81%
n
IOUT Up to 500mA
n
VOUT: Fixed 3.3V, 5V or Adjustable (2.5V to 5V)
n
Ultralow EMI Emissions
n
Engineered for Diagnostic Coverage in ISO 26262
Systems
n
Overtemperature, Overvoltage and Short-Circuit
Protection
n
Operating Junction Temperature: 150°C Max
n
POR/Watchdog Controller w/External Timing Control
n
Thermally Enhanced 16-Lead MSOP Package
APPLICATIONS
n
Automotive ECU/CAN Transceiver Supplies
n
Industrial/Telecom Housekeeping Supplies
n
Low Power 12V to 5V Conversion
All registered trademarks and trademarks are the property of their respective owners.
LTC3246
3246 TA01a
VIN
SEL2
SEL1
BIAS
RT
WT
C+
C–
GND
VOUT
OUTS/ADJ
RST
WDI
RSTI
1µF
10µF
10µF
500k
500k
µC
RESET
2.2µF
VIN = 2.7V TO 38V
VOUT = 5V
IOUT UP TO 500mA
0
2
4
6
8
10
12
14
16
4.80
4.85
4.90
4.95
5.00
5.05
5.10
5.15
5.20
3246 TA01b
VIN (V)
IOUT = 50mA
IOUT = 500mA


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