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LTC3200-5 Datasheet(PDF) 6 Page - Linear Technology

Part # LTC3200-5
Description  Wide VIN Range, Low Noise, 250mA Buck-Boost Charge Pump
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3200-5 Datasheet(HTML) 6 Page - Linear Technology

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LTC3245
6
3245f
For more information www.linear.com/LTC3245
pin FuncTions
VIN (Pins 1, 2, 3): Power Input Pins. Input voltage for both
charge pump and IC control circuitry. The VIN pin oper-
ates from 2.7V to 38V. All VIN pins should be connected
together at pins.
BURST (Pin 4): Burst Mode Logic Input. A logic high on
the BURST pin operates the charge pump in low noise
constant frequency. A logic low will operates the charge
pump in Burst Mode operation for higher efficiency at
low output currents. The BURST pin has a 1μA (typical)
pull-down current to ground and can tolerate 38V inputs
allowing it to be pin-strapped to VIN.
SEL1 (Pin 5): Logic Input Pin. See Table 1 for SEL1/SEL2
operatinglogic.TheSEL1pinhasa1μA(typical)pull-down
current to ground and can tolerate 38V inputs allowing it
to be pin-strapped to VIN.
SEL2 (Pin 6): Logic Input Pin. See Table 1 for SEL1/SEL2
operatinglogic.TheSEL2pinhasa1μA(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
OUTS/ADJ (Pin 7): VOUT Sense / Adjust Input Pin. This pin
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 1.2V when the device is
enabled in adjustable mode. (OUTS / ADJ are selected by
SEL1 and SEL2 pins; See Table 1)
PGOOD (Pin 8): Power Good Open Drain Logic Output.
The PGOOD pin goes high impedance when VOUT is about
6% of its final operating voltage. PGOOD is intended to
be pulled up to VOUT or other low voltage supply with an
external resistor.
C+ (Pin 9): Flying Capacitor Positive Connection.
VOUT (Pin 10): Charge Pump Output Voltage. If VIN drops
below its UVLO threshold, the connection from VIN be-
comes high impedance with no reverse leakage from
VOUT to VIN. VOUT regulation only takes place above the
UVLO threshold. VOUT can be programmed to regulate
from 2.5V to 5V.
C(Pin 11): Flying Capacitor Negative Connection.
GND (Pin 12, Exposed Pad Pin 13): Ground. The exposed
package pad is ground and must be soldered to the PC
board ground plane for proper functionality and for rated
thermal performance.
Typical perForMance characTerisTics T
A = 25°C, unless otherwise noted.
5V Output Transient Response
3.3V Output Transient Response
200mA
IOUT 5mA
LOW NOISE
AC 50mV/DIV
Burst Mode
OPERATION
AC 50mV/DIV
VIN = 12V
VOUT = 5V
3245 G19
150mA
IOUT 5mA
LOW NOISE
AC 50mV/DIV
Burst Mode
OPERATION
AC 50mV/DIV
VIN = 12V
VOUT = 3.3V
3245 G20


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