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LTC3429B Datasheet(PDF) 5 Page - Linear Technology

Part # LTC3429B
Description  600mA, 500kHz Micropower Synchronous Boost Converter with Output Disconnect
PDF  12 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3429B Datasheet(HTML) 5 Page - Linear Technology

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LTC3429/LTC3429B
5
3429fa
PI FU CTIO S
SW (Pin 1): Switch Pin. Connect inductor between SW
and VIN. 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
150Ω 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, 500kHz
typical operating frequency.
SHDN = Low: Shutdown, quiescent current < 1µA.
Output capacitor can be completely discharged through
the load or feedback resistors. A 150Ω resistor is
internally connected between SW and VIN.
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 completely disconnected from VIN when SHDN is low
due to the output disconnect feature.
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
500kHz
FB
3429 BD
3
VOUT
VIN
L1
5
SW
0.45Ω
WELL
SWITCH
1
VIN
1V TO 4.4V
6
SHDN
4
GND
2
gm
ERROR
AMP
VOUT
GOOD
PWM
COMPARATOR
RC
80k
SHUTDOWN
CC
150pF
CP2
2.5pF
R2
R1
SLEEP
Σ
SYNC
DRIVE
CONTROL
0.35Ω
2.3V
COUT
CPL
(OPTIONAL)
2.5V TO 5V
CIN
+
CURRENT
SENSE
BLOCK DIAGRA



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