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LTC3442 Datasheet(PDF) 6 Page - Linear Technology

Part # LTC3442
Description  Micropower Synchronous Buck-Boost DC/DC Converter with Automatic Burst Mode Operation
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3442 Datasheet(HTML) 6 Page - Linear Technology

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LTC3442
6
3442fb
For more information www.linear.com/LTC3442
PIN FUNCTIONS
TYPICAL PERFORMANCE CHARACTERISTICS (T
A = 25°C unless otherwise specified).
Transition from Burst Mode
Operation to Fixed Frequency Mode
Pulsed Overload Using Average Input
Current Limit
200µs/DIV
3442 G22
COUT = 100µF
LOW ESR TANTALUM
INDUCTOR
CURRENT
0.5A/DIV
VOUT
50mV/DIV
1ms/DIV
3442 G23
RLIM = 133k
CLIM = .001µF
INDUCTOR
CURRENT
0.5A/DIV
RLIM PIN
0.5V/DIV
VOUT
2V/DIV
SHDN/SS (Pin 1): Combined Soft-Start and Shutdown.
Applied voltage <0.4V shuts down the IC. Tie to >1.4V to
enable the IC and >2.4V to ensure the error amp is not
clamped from soft-start. For Burst Mode operation, this
pin must be pulled up to within 0.5V of VIN. An RC network
fromtheshutdowncommandsignaltothispinwillprovide
a soft-start function by limiting the rise time of the VC pin.
RT (Pin 2): Programs the Frequency of the Internal Os-
cillator. Place a resistor from this pin to ground. See the
Applications Information section for component value
selection.
SGND (Pin 3): Signal Ground for the IC.
SW1 (Pin 4): Switch Pin Where Internal Switches A and B
Are Connected. Connect inductor from SW1 to SW2. An
optional Schottky diode can be connected from SW1 to
ground for a moderate efficiency improvement. Minimize
trace length to reduce EMI.
PGND (Pin 5, 13): Power Ground for the Internal NMOS
Power Switches. The exposed pad must be soldered to
PCB ground to provide both electrical contact and a good
thermal contact to the PCB.
SW2 (Pin 6): Switch Pin Where Internal Switches C
and D Are Connected. An optional Schottky diode can be
connected from SW2 to VOUT for a moderate efficiency
improvement. Minimize trace length to reduce EMI.
BURST (Pin 7): Used to Set the Automatic Burst Mode Op-
erationThreshold.Placearesistorandcapacitorinparallel
from this pin to ground. See the Applications Information
sectionforcomponentvalueselection.Formanualcontrol,
ground the pin to force Burst Mode operation, connect to
VOUT to force fixed frequency mode.
VOUT (Pin 8): Output of the Synchronous Rectifier. A filter
capacitor is placed from VOUT to GND. A ceramic bypass
capacitor is recommended as close to the VOUT and GND
pins as possible.
VIN (Pin 9): Input Supply Pin. Internal VCC for the IC. A
10µF ceramic capacitor is recommended as close to VIN
and SGND as possible.
RLIM (Pin 10): Sets the Average Input Current Limit
Threshold. Place a resistor and capacitor in parallel from
this pin to ground. See the Applications Information sec-
tion for component value selection.
VC(Pin11):ErrorAmpOutput.Afrequencycompensation
network is connected from this pin to FB to compensate
the loop. During Burst Mode operation, VC is internally
connected to a hold circuit.
FB (Pin 12): Feedback Pin. Connect resistor divider tap
here. The output voltage can be adjusted from 2.4V to
5.25V. The feedback reference voltage is typically 1.22V.


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