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LTC3203B-1 Datasheet(PDF) 6 Page - Linear Technology

Part No. LTC3203B-1
Description  500mA Output Current Low Noise Dual Mode Step-Up Charge Pumps
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Maker  LINER [Linear Technology]
Homepage  http://www.linear.com
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LTC3203B-1 Datasheet(HTML) 6 Page - Linear Technology

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LTC3203/LTC3203-1
LTC3203B/LTC3203B-1
6
32031fa
PI FU CTIO S
C2+ (Pin 1): Flying Capacitor 2 Positive Terminal (C2).
VOUT (Pin 2): Regulated Output Voltage. VOUT should be
bypassed with a low ESR ceramic capacitor as close to the
pin as possible for best performance. The capacitor should
have greater than 4.7
µF capacitance under all conditions.
C1+ (Pin 3): Flying Capacitor 1 Positive Terminal (C1).
SHDN (Pin 4): Active Low Shutdown Input. A low on SHDN
puts the LTC3203/LTC3203-1/LTC3203B/LTC3203B-1 in
low current shutdown mode. Do not float the SHDN pin.
VSEL (Pin 5) (LTC3203-1/LTC3203B-1): Output Voltage
Selection Input. A logic 0 at VSEL sets the regulated VOUT
to 4.5V; and a logic 1 sets the regulated VOUT to 5V. Do not
float the VSEL pin.
FB (Pin 5) (LTC3203/LTC3203B): Feedback. The voltage
on this pin is compared to the internal reference voltage
(0.91V) by the error amplifier to keep the output in
regulation. An external resistor divider is required
between VOUT and FB to program the output voltage.
MODE (Pin 6): Mode Selection Input. The LTC3203/
LTC3203-1/LTC3203B/LTC3203B-1 operates in 1.5x
mode if the MODE pin is greater than VMODEH, which
gives higher charge pump efficiency. If the MODE pin is
less than VMODEL, the LTC3203/LTC3203-1/LTC3203B/
LTC3203B-1 operates in 2x mode, which gives a higher
charge pump boost voltage.
VIN (Pin 7): Input Supply Voltage. VIN should be bypassed
with a more than 2.2
µF low ESR ceramic capacitor to GND.
C2(Pin 8): Flying Capacitor 2 Negative Terminal (C2).
GND (Pin 9): Ground. This pin should be connected
directly to a low impedance ground plane.
C1(Pin 10): Flying Capacitor 1 Negative Terminal (C1).
Exposed Pad (Pin 11): Ground. This pin must be sol-
dered to the PCB for electrical contact and rated thermal
performance.


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