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LT1612 Arkusz danych(PDF) 3 Page - Linear Technology

Numer części LT1612
Szczegółowy opis  Synchronous, Step-Down 800kHz PWM DC/DC Converter
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Producent  LINER [Linear Technology]
Strona internetowa  http://www.linear.com
Logo LINER - Linear Technology

LT1612 Arkusz danych(HTML) 3 Page - Linear Technology

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LT1612
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
SHDN Pin Current
SHDN = 2V
q
10
15
µA
SHDN = 5V
q
30
45
µA
BOOST Pin Current
BOOST = VIN + 2V
4
mA
Switch Current Limit (Note 4)
Duty Cycle = 0%
MODE = OV
600
710
900
mA
MODE = 5V
550
650
900
mA
Burst Mode Operation Current Limit
MODE = 0V
180
mA
Switch Voltage Drop
ISW = 500mA
200
280
mV
Rectifier Voltage Drop
IRECT = 500mA
300
400
mV
SW Pin Leakage
VSW = 5V
q
1
µA
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LT1612E is guaranteed to meet performance specifications
from 0
°C to 70°C. Specifications over the –40°C to 85°C operating
ELECTRICAL CHARACTERISTICS
VC (Pin 1): Compensation Pin. This is the current sink/
source output of the error amplifier. By connecting an RC
network from this pin to ground, frequency response can
be tuned for a wide range of circuit configurations. The
voltage at this pin also sets the current limit, and if
grounded, the switch will remain in the OFF state.
FB (Pin 2): Feedback Pin. This pin is the negative input to
the error amplifier. Connect the resistor divider tap to this
point which sets VOUT according to:
VOUT = 0.62V (1 + R1/R2)
VIN (Pin 3): Supply Pin. Bypass capacitor C1 must be right
next to this pin.
GND (Pin 4): Ground Pin. Connect directly to local ground
plane.
PIN FUNCTIONS
SW (Pin 5): Switch Pin. Connect inductor and boost
capacitor here. Minimize trace area at this pin to keep EMI
down.
BOOST (Pin 6): This is the supply pin for the switch driver
and must be above VIN by 1.5V for proper switch opera-
tion. Connect the boost capacitor to this pin.
MODE (Pin 7): Burst Mode Operation Disable Pin. For
continuous switching operation (low noise), pull this pin
above 2V. For Burst Mode operation which gives better
light load efficiency, tie to ground. Output ripple voltage in
Burst Mode operation is typically 30mVP-P. See applica-
tions section for more information about this function.
SHDN (Pin 8): Shutdown Pin. Pull this pin low for shut-
down mode. Tie to a voltage between 2V and 5.5V for
normal operation.
The q denotes specifications which apply over the full operating
temperature range, otherwise specifications are TA = 25°C, VIN = VSHDN = 3V
temperature range are assured by design, characterization and correlation
with statistical process controls.
Note 3: Bias current flows out of the FB pin.
Note 4: Duty cycle affects current limit due to slope compensation.


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