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LTC3534 Datasheet(PDF) 7 Page - Linear Technology

Part # LTC3534
Description  7V, 500mA Synchronous Buck-Boost DC/DC Converter
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3534 Datasheet(HTML) 7 Page - Linear Technology

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LTC3534
7
3534fb
For more information www.linear.com/LTC3534
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 VC pin. PWM mode operation must be commanded
to properly enable the IC.
GND (Pin 3): Signal Ground for the IC.
PGND1,PGND2(Pins4,7):PowerGroundfortheInternal
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. PWM must be driven
HIGH during start-up. When VOUT is in regulation, the
PWM pin may be driven LOW to command Burst Mode
operation. Applying a voltage below 400mV enables Burst
Modeoperation,providingasignificantefficiencyimprove-
ment at light loads. Burst Mode operation will continue
until this pin is driven high. Applying a voltage above 1.4V
disables Burst Mode operation, enabling low noise, fixed
frequency operation.
VOUT(Pin11):OutputoftheSynchronousRectifier.Afilter
capacitor is placed from VOUT to GND. A ceramic bypass
capacitor is recommended as close to the VOUT and GND
pins as possible. VOUT is given by the following equation:
VOUT =1.000•
R1
+R2
R2
V
PVIN (Pin 12): Power VIN Supply Pin. A 10µF ceramic
capacitor is recommended as close to the PVIN and PGND
pins as possible.
VIN (Pin 13): Input Supply Pin. Connect the power source
to this pin.
VC (Pin 14): Error Amp Output. An R-C network is con-
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 VOUT resistor divider
tap to this pin. The output voltage can be adjusted from
1.8V to 7V. The feedback reference voltage is typically 1V.
ExposedPad(Pin17;DHCPackage):ICSubstrateGround.
This pin MUST be soldered to the printed circuit board
ground to provide both electrical contact and a good
thermal contact to the PCB.
pin FuncTions


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