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LTC3442 데이터시트(PDF) 5 Page - Linear Technology

부품명 LTC3442
상세설명  Micropower Synchronous Buck-Boost DC/DC Converter
PDF  16 Pages
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제조업체  LINER [Linear Technology]
홈페이지  http://www.linear.com
Logo LINER - Linear Technology

LTC3442 데이터시트(HTML) 5 Page - Linear Technology

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LTC3532
5
3532fc
SW2
5V/DIV
SW1
5V/DIV
INDUCTOR
CURRENT
500mA/DIV
VOUT
100mV/DIV
4μs/DIV
VIN = 4.2V
VOUT = 3.3V
ILOAD = 20mA
COUT = 22μF
3535 G17
SW2
5V/DIV
SW1
5V/DIV
INDUCTOR
CURRENT
500mA/DIV
VOUT
100mV/DIV
4μs/DIV
VIN = 3.75V
VOUT = 3.3V
ILOAD = 20mA
COUT = 22μF
340612 G16
PI FU CTIO S
RT (Pin 1): Timing Resistor to Program the Oscillator
Frequency. The programming range is 300kHz to 2MHz.
f(kHz) =
48,000
RT(kΩ)
BURST (Pin 2): Used to Set the Automatic Burst Mode Op-
eration Threshold. Place a resistor and capacitor in parallel
from this pin to ground. See the Applications Information
section for component value selection. For manual control,
ground the pin to force Burst Mode operation, connect to
VOUT to force fixed frequency mode.
SW1 (Pin 3): Switch Pin Where the Internal Switches A
and B are Connected. Connect inductor from SW1 to SW2.
An optional Schottky diode can be connected from SW1
to ground. Minimize trace length to minimize EMI.
SW2 (Pin 4): Switch Pin Where the Internal Switches C
and D are Connected. For applications with output voltages
over 4.3V, a Schottky diode is required from SW2 to VOUT
to ensure SW2 does not exhibit excess voltage.
GND (Pin 5): Signal and Power Ground for the IC.
VOUT (Pin 6): Output of the Synchronous Rectifier. A filter
capacitor is placed from VOUT to GND.
VIN (Pin 7): Input Supply Pin. Supplies current to the
inductor through SW1 and supplies internal VCC for the
IC. A ceramic bypass capacitor as close to the VIN pin and
GND (Pin 5) is required.
Switch Pins Before Entering
Buck Mode
Output Ripple at 100mA Load
Burst Mode, Boost
TYPICAL PERFOR A CE CHARACTERISTICS T
A = 25°C, unless otherwise specified.
Burst Mode, Buck-Boost
Burst Mode, Buck
SW1
2VDIV
SW2
2VDIV
40ns/DIV
VIN = 4V
VOUT = 3.3V
ILOAD = 100mA
3535 G13
VOUT
50mV/DIV
VOUT
50mV/DIV
VOUT
50mV/DIV
400ns/DIV
VOUT = 3.6V
IOUT = 100mA
COUT = 10μF
3535 G14
VIN = 2.4V
VIN = 3.6V
VIN = 4.5V
SW1
5V/DIV
SW2
5V/DIV
INDUCTOR
CURRENT
500mA/DIV
VOUT
100mV/DIV
4μs/DIV
VIN = 2.4V
VOUT = 3.3V
ILOAD = 20mA
COUT = 22μF
3535 G15



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