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LTC1436AIGN 数据表(PDF) 7 Page - Linear Technology

部件名 LTC1436AIGN
功能描述  High Efficiency Low Noise Synchronous Step-Down Switching Regulators
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制造商  LINER [Linear Technology]
网页  http://www.linear.com
标志 LINER - Linear Technology

LTC1436AIGN 数据表(HTML) 7 Page - Linear Technology

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LTC1436A
LTC1436A-PLL/LTC1437A
TYPICAL PERFORMANCE CHARACTERISTICS
Auxiliary Regulator
Sink Current Available
AUX DR VOLTAGE (V)
0
0
5
10
15
20
24
6
8
1436 G19
10
12
14
16
Auxiliary Regulator PSRR
FREQUENCY (kHz)
10
10
20
30
40
50
60
70
100
1000
1436 G20
10mA LOAD
100mA LOAD
PIN FUNCTIONS
VIN: Main Supply Pin. Must be closely decoupled to the
IC’s signal ground pin.
INTVCC: Output of the Internal 5V Regulator and EXTVCC
Switch. The driver and control circuits are powered from
this voltage. Must be closely decoupled to power ground
with a minimum of 2.2
µFtantalumorelectrolyticcapacitor.
DRVCC: Bottom MOSFET Driver Supply Voltage.
EXTVCC: Input to the Internal Switch Connected to INTVCC.
This switch closes and supplies VCC power whenever
EXTVCC is higher than 4.7V. See EXTVCC connection in
Applications Information section. Do not exceed 10V on
this pin. Connect to VOUT if VOUT ≥ 5V.
BOOST: Supply to Topside Floating Driver. The bootstrap
capacitor is returned to this pin. Voltage swing at this pin
is from INTVCC to VIN + INTVCC.
SW: Switch Node Connection to Inductor. Voltage swing
at this pin is from a Schottky diode (external) voltage drop
below ground to VIN.
SGND: Small Signal Ground. Must be routed separately
from other grounds to the (–) terminal of COUT.
PGND: Driver Power Ground. Connects to source of
bottom N-channel MOSFET and the (–) terminal of CIN.
SENSE : The (–) Input to the Current Comparator.
SENSE +: The (+) Input to the Current Comparator. Built-
in offsets between SENSEand SENSE+ pins in conjunction
with RSENSE set the current trip thresholds.
VOSENSE: Receives the remotely sensed feedback voltage
either from the output or from an external resistive divider
across the output . The VPROG pin determines which point
VOSENSE must connect to.
VPROG: This voltage selects the output voltage. For VPROG
< VINTVCC/3 the output is set to 3.3V with VOSENSE
connected to the output. With VPROG > VINTVCC/1.5 the
output is set to 5V with VOSENSE connected to the output.
Leaving VPROG open (DC) allows the output voltage to be
set by an external resistive divider connected to VOSENSE.
COSC: External capacitor COSC from this pin to ground sets
the operating frequency.
ITH: Error Amplifier Compensation Point. The current
comparator threshold increases with this control voltage.
Nominal voltage range for this pin is 0V to 2.5V.
RUN/SS: Combination of Soft Start and Run Control
Inputs. A capacitor to ground at this pin sets the ramp time
to full current output. The time is approximately 0.5s/
µF.


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