LTC3526 Linear Technology, LTC3526 Datasheet - Page 6

• Manufacturer Part Number: LTC3526
• Description: 500mA 1MHz Synchronous Step-Up DC/DC Converters
• Manufacturer: Linear Technology

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LTC3526/LTC3526B
TYPICAL PERFORMANCE CHARACTERISTICS
ELECTRICAL CHARACTERISTICS
SW (Pin 1): Switch Pin. Connect inductor between SW and
V
to reduce EMI. If the inductor current falls to zero or SHDN
is low, an internal anti-ringing switch is connected from
SW to V
GND (Pin 2): Signal and Power Ground. Provide a short
direct PCB path between GND and the (–) side of the input
and output capacitors.
V
ceramic decoupling capacitor from this pin to ground
using short direct PCB traces.
SHDN (Pin 4): Logic Controlled Shutdown Input. There
is an internal 4MΩ pull-down on this pin.
6
IN
IN
• SHDN = High: Normal operation
• SHDN = Low: Shutdown, quiescent current < 1μA
. Keep PCB trace lengths as short and wide as possible
(Pin 3): Input Supply Pin. Connect a minimum of 1μF
IN
to minimize EMI.
AC COUPLED
100mV/DIV
50mA/DIV
CURRENT
LOAD
V
OUT
Load Step Response
(Fixed Frequency)
V
V
50mA TO 100mA STEP
C
IN
OUT
OUT
= 1.2V
= 3.3V
= 10μF
100μs/DIV
3526 G21
FB (Pin 5): Feedback Input to the g
nect resistor divider tap to this pin. The top of the divider
connects to the output capacitor, the bottom of the divider
connects to GND. Referring to the Block Diagram, the output
voltage can be adjusted from 1.6V to 5.25V by:
V
synchronous rectifi er. PCB trace from V
fi lter capacitor (4.7μF minimum) should be as short and
wide as possible.
Exposed Pad (Pin 7): The Exposed Pad must be soldered
to the PCB ground plane. It serves as an additional ground
connection and as a means of conducting heat away from
the package.
OUT
V
OUT
(Pin 6): Output voltage sense and drain of the internal
AC COUPLED
100mV/DIV
CURRENT
50mA/DIV
= 1.195V • 1+
LOAD
V
OUT
Load Step Response (from Burst
Mode Operation)
V
V
5mA TO 100mA STEP
C
IN
OUT
OUT
= 1.2V
= 3.3V
= 10μF
R2
R1
50μs/DIV
m
Error Amplifi er. Con-
OUT
3526 G22
to the output
3526bfb