LTC3534 Linear Dimensions Semiconductor, LTC3534 Datasheet - Page 7

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LTC3534

Manufacturer Part Number
LTC3534
Description
500mA Synchronous Buck-Boost DC
Manufacturer
Linear Dimensions Semiconductor
Datasheet

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GND Pads (Pins 1, 8, 9, 16; GN Package): IC Substrate
Grounds. These pins MUST be soldered to the printed
circuit board ground to provide both electrical contact
and a good thermal contact to the PCB.
RUN/SS (Pin 2): Combined Shutdown and Soft-Start. Ap-
plying a voltage below 400mV shuts down the IC. Apply
a voltage above 1.4V to enable the IC and above 2.4V to
ensure that the error amp is not clamped from soft-start.
An R-C from the enable command signal to this pin will
provide a soft-start function by limiting the rise time of
the V
GND (Pin 3): Signal Ground for the IC.
PGND1, PGND2 (Pins 4, 7): Power Ground for the In-
ternal N-channel MOSFET Power Switches (Switches B
and C).
SW1 (Pin 5): Switch Pin where Internal Switches A and
B are Connected. Connect inductor from SW1 to SW2.
Minimize trace length to reduce EMI.
SW2 (Pin 6): Switch Pin where Internal Switches C and D
are Connected. Minimize trace length to reduce EMI.
PWM (Pin 10): Burst Mode Select. Applying a voltage
below 400mV enables Burst Mode operation, providing a
signifi cant effi ciency improvement at light loads. During the
period where the IC is supplying energy to the output, the
inductor peak current will reach 400mA typical and return
to zero current on each cycle. Burst Mode operation will
continue until this pin is driven high. Applying a voltage
above 1.4V disables Burst Mode operation, enabling low
noise, fi xed frequency operation.
PIN FUNCTIONS
C
pin.
V
fi lter capacitor is placed from V
bypass capacitor is recommended as close to the V
and GND pins as possible. V
equation:
PV
capacitor is recommended as close to the PV
pins as possible.
V
to this pin.
V
nected from this pin to FB for loop compensation. Refer
to “Closing the Feedback Loop” section for component
selection guidelines.
FB (Pin 15): Feedback Pin. Connect V
to this pin. The output voltage can be adjusted from 1.8V
to 7V. The feedback reference voltage is typically 1V.
Exposed Pad (Pin 17; DHC Package): IC Substrate Ground.
This pin MUST be soldered to the printed circuit board
ground to provide both electrical contact and a good
thermal contact to the PCB.
OUT
IN
C
IN
V
(Pin 14): Error Amp Output. An R-C network is con-
(Pin 13): Input Supply Pin. Connect the power source
OUT
(Pin 12): Power V
(Pin 11): Output of the Synchronous Rectifi er. A
= 1.000 •
R1+ R2
R2
IN
V
Supply Pin. A 10μF ceramic
OUT
is given by the following
OUT
OUT
to GND. A ceramic
resistor divider tap
LTC3534
IN
and PGND
7
OUT
3534f

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