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LTC3526L-2_15 Datasheet, PDF (6/16 Pages) Linear Technology – 550mA 2MHz Synchronous Step-Up DC/DC Converters
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LTC3526L-2/LTC3526LB-2
Typical Performance Characteristics TA = 25°C, unless otherwise noted.
Load Step Response (from Burst
Mode Operation) (LTC3526L-2)
VOUT
100mV/DIV
AC-COUPLED
LOAD
CURRENT
50mA/DIV
VIN = 3.6V
VOUT = 5V
100µs/DIV
20mA TO 170mA STEP
COUT = 10µF
3526lb2 G19
Load Step Response
(Fixed Frequency)
VOUT
100mV/DIV
AC-COUPLED
LOAD
CURRENT
50mA/DIV
VIN = 3.6V
100µs/DIV
VOUT = 5V
50mA TO 150mA STEP
COUT = 4.7µF
3526lb2 G20
Load Step Response
(Fixed Frequency)
VOUT
100mV/DIV
AC-COUPLED
LOAD
CURRENT
50mA/DIV
VIN = 1.2V
100µs/DIV
VOUT = 3.3V
50mA TO 100mA STEP
COUT = 4.7µF
3526lb2 G21
Load Step Response (from Burst
Mode Operation) (LTC3526L-2)
VOUT
100mV/DIV
AC-COUPLED
LOAD
CURRENT
50mA/DIV
VIN = 1.2V
50µs/DIV
VOUT = 3.3V
5mA TO 100mA STEP
COUT = 10µF
3526lb2 G22
Pin Functions
SW (Pin 1): Switch Pin. Connect inductor between SW and
VIN. Keep PCB trace lengths as short and wide as possible
to reduce EMI. If the inductor current falls to zero or SHDN
is low, an internal anti-ringing switch is connected from
SW to VIN to minimize EMI.
GND (Pin 2, Exposed Pad Pin 7): Signal and Power Ground.
Provide a short direct PCB path between GND and the
(–) side of the input and output capacitors. 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.
VIN (Pin 3): Input Supply Pin. Connect a minimum of 1µF
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.
• SHDN = High: Normal operation
• SHDN = Low: Shutdown, quiescent current < 1µA
FB (Pin 5): Feedback Input to the gm Error Amplifier. Con-
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 1.5V to 5.25V by:
VOUT
=
1.195V
•


1+
R2 
R1
VOUT (Pin 6): Output voltage sense and drain of the internal
synchronous rectifier. PCB trace from VOUT to the output
filter capacitor (4.7µF minimum) should be as short and
wide as possible.
3526lb2fa
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