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LTC3246 데이터시트(HTML) 8 Page - Analog Devices

부품명 LTC3246
상세내용  Wide VIN Range Buck-Boost Charge Pump with Watchdog Timer
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LTC3246 데이터시트(HTML) 8 Page - Analog Devices

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LTC3246
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For more information www.linear.com/LTC3246
PIN FUNCTIONS
WT (Pin 1): Watchdog Timer Control Pin. Attach an ex-
ternal capacitor (CWT) to GND to set a watchdog upper
boundary timeout time (See “Watchdog Timeout Period
vs WT Capacitance” graph on page 6). Tie WT to BIAS to
generate a timeout of about 1.6s. Tie WT and WDI to GND
to disable the watchdog timer.
RT (Pin 2): Reset Timeout Control Pin. Attach an external
capacitor (CRT) to GND to set a reset timeout time (See
“Reset Timeout Period vs RT Capacitance” graph on
page 6). Tie RT to BIAS to generate a reset timeout of
about 200ms.
RSTI (Pin 3): Reset Logic Comparator Pin. The RSTI input
iscomparedtoareferencethreshold(1.2Vtypical).IfRSTI
is below the reference voltage, the part will enter the reset
state and the RST pin will be low. Once RSTI exceeds the
reference voltage and VOUT in regulation, the reset timer
is started. RST pin will be low until the reset period times
out. RSTI is a high impedance pin and must be driven to
a valid level. Do not float.
BIAS (Pin 4, 8): Internal BIAS Voltage. The bias pin is for
internal operation only and should not be loaded or driven
externally. Bypass BIAS with a 10µF or greater ceramic
capacitor.
SEL2 (Pin 5): Logic Input Pin. See Table 1 for SEL1/SEL2
operating logic. SEL2 enables and disables the charge
pump along with the SEL1 pin. The SEL2 pin has a 1µA
(typical) pull down current to ground and can tolerate 38V
inputs allowing it to be pin-strapped to VIN.
VIN(Pin6,9):PowerInputPin.Inputvoltageforbothcharge
pump and IC control circuitry. The VIN pin operates from
2.7V to 38V. All VIN pins should be connected together at
pinsandbypassedwitha1µForgreaterceramiccapacitor.
SEL1 (Pin 7): Logic Input Pin. See Table 1 for SEL1/SEL2
operating logic. SEL1 enables and disables the charge
pump along with the SEL2 pin. The SEL1 pin has a 1µA
(typical) pull down current to ground and can tolerate 38V
inputs allowing it to be pin-strapped to VIN.
Table 1. VOUT Operating Modes
SEL2
SEL1
MODE
LOW
LOW
Shutdown
LOW
HIGH
Adjustable VOUT
HIGH
LOW
Fixed 5V
HIGH
HIGH
Fixed 3.3V
WDI (Pin 10): Watchdog Logic Input Pin. If the watchdog
timer is not disabled then WDI must be driven such that a
falling edge occurs within a time less than the watchdog
upper boundary time, or RST will be asserted low. The
WDI period must also be greater than the watchdog lower
boundary time, and only falling edges are considered. Tie
WT and WDI to GND to disable the watchdog timer. WDI
is a high impedance pin and must be driven to a valid
level. Do not float.
C+ (Pin 11): Connect to positive flying capacitor terminal
only. Do not load or drive externally.
VOUT (Pin 12): Charge Pump Output Voltage. The charge
pumpoutputisenabledifeitherSEL1orSEL2arelogichigh.
C- (Pin 13): Connect to negative flying capacitor terminal
only. Do not load or drive externally.
RST (Pin 14): Reset Open Drain Logic Output. The RST pin
is low impedance during the reset period, and goes high
impedance during the watchdog period. RST is intended
to be pulled up to low voltage supply (such as VOUT) with
an external resistor.
GND (Pin 15, Exposed Pad): Ground. The exposed pack-
age pad is ground and must be soldered to the PC board
ground plane for proper functionality and for rated thermal
performance.
OUTS/ADJ (Pin 16): VOUTSense/AdjustInputPin.Thispin
acts as VOUT sense (OUTS) for 5V or 3.3V fixed outputs
and adjust (ADJ) for adjustable output through external
feedback. The ADJ pin servos to 1.1V when the device is
enabled in adjustable mode. (OUTS/ADJ are selected by
SEL1 and SEL2 pins; See Table 1). Connect OUTS/ADJ to
VOUT or external divider as appropriate.


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