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LTC3400 데이터시트(PDF) 4 Page - Linear Technology

부품명 LTC3400
상세설명  600mA, 1.2MHz Micropower Synchronous Boost Converter in ThinSOT
PDF  12 Pages
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제조업체  LINER [Linear Technology]
홈페이지  http://www.linear.com
Logo LINER - Linear Technology

LTC3400 데이터시트(HTML) 4 Page - Linear Technology

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LTC3400/LTC3400B
4
3400fa
PI FU CTIO S
SW (Pin 1): Switch Pin. Connect inductor between SW
and VIN. Optional Schottky diode is connected between
SW and VOUT. Keep these PCB trace lengths as short and
wide as possible to reduce EMI and voltage overshoot. If
the inductor current falls to zero, or SHDN is low, an
internal 100
Ω antiringing switch is connected from SW to
VIN to minimize EMI.
GND (Pin 2): Signal and Power Ground. Provide a short
direct PCB path between GND and the (–) side of the output
capacitor(s).
FB (Pin 3): Feedback Input to the gm Error Amplifier.
Connect resistor divider tap to this pin. The output voltage
can be adjusted from 2.5V to 5V by:
VOUT = 1.23V • [1 + (R1/R2)]
SHDN (Pin 4): Logic Controlled Shutdown Input.
SHDN = High: Normal free running operation, 1.2MHz
typical operating frequency.
SHDN = Low: Shutdown, quiescent current < 1
µA.
100
Ω connected between SW and VIN.
Typically, SHDN should be connected to VIN through a 1M
pull-up resistor.
VOUT (Pin 5): Output Voltage Sense Input and Drain of the
Internal Synchronous Rectifier MOSFET. Bias is derived
from VOUT. PCB trace length from VOUT to the output filter
capacitor(s) should be as short and wide as possible. VOUT
is held at VIN – 0.6V in shutdown due to the body diode of
the internal PMOS.
VIN (Pin 6): Battery Input Voltage. The device gets its
start-up bias from VIN. Once VOUT exceeds VIN, bias
comes from VOUT. Thus, once started, operation is com-
pletely independent from VIN. Operation is only limited by
the output power level and the battery’s internal series
resistance.
1.23V
REF
Burst Mode
OPERATION
CONTROL
SHUTDOWN
CONTROL
SLOPE
COMP
PWM
CONTROL
START-UP
OSC
MUX
A
B
A/B
RAMP
GEN
1.2MHz
FB
3400 BD
3
VOUT
OPTIONAL
SCHOTTKY
L1
4.7
µH
5
SW
1
VIN
SINGLE
CELL
INPUT
6
SHDN
4
GND
2
gm
ERROR
AMP
VOUT
GOOD
PWM
COMPARATOR
RC
80k
SHUTDOWN
CC
150pF
CP2
2.5pF
R2
604k
1%
(EXTERNAL)
R1
1.02M
1%
(EXTERNAL)
SLEEP
Σ
SYNC
DRIVE
CONTROL
0.35
Ω
0.45
Ω
2.3V
COUT
4.7
µF
3.3V
OUTPUT
CIN
1
µF
+
CURRENT
SENSE
CFF
(OPTIONAL)
BLOCK DIAGRA



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