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LTC1539 Datasheet(PDF) 7 Page - Linear Technology

Part # LTC1539
Description  Dual High Efficiency, Low Noise, Synchronous Step-Down Switching Regulators
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC1539 Datasheet(HTML) 7 Page - Linear Technology

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LTC1538-AUX/LTC1539
TYPICAL PERFORMANCE CHARACTERISTICS
Auxiliary Regulator PSRR
Auxiliary Regulator Sink
Current Available
AUX DR VOLTAGE (V)
0
0
5
10
15
20
24
6
8
1538/39 • G19
10
12
14
16
FREQUENCY (kHz)
10
100
90
80
70
60
50
40
30
20
10
0
100
1000
1538/39 • G20
IL = 10mA
IL = 100mA
PIN FUNCTIONS
VIN: Main Supply Pin. Must be closely decoupled to the
IC’s signal ground pin.
INTVCC/5V STANDBY: Output of the Internal 5V Regulator
and the 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
µF tantalum or
electrolytic capacitor. The INTVCC regulator remains on
when both RUN/SS1 and RUN/SS2 are low. Refer to the
LTC1438/LTC1439 for applications which do not require a
5V standby regulator.
EXTVCC: External Power Input to an Internal Switch. This
switch closes and supplies INTVCC, bypassing the internal
low dropout regulator whenever EXTVCC is higher than 4.8V.
Connect this pin to VOUT of the controller with the higher
output voltage. Do not exceed 10V on this pin. See EXTVCC
connection in Applications Information section.
BOOST 1, BOOST 2: Supplies to the Topside Floating Drivers.
The bootstrap capacitors are returned to these pins. Voltage
swing at these pins is from INTVCC to VIN + INTVCC.
SW1, SW2: Switch Node Connections to Inductors. Volt-
age swing at these pins is from a Schottky diode (external)
voltage drop below ground to VIN.
SGND: Small Signal Ground. Common to both controllers,
must be routed separately from high current grounds to
the (–) terminals of the COUT capacitors.
PGND: Driver Power Ground. Connects to sources of
bottom N-channel MOSFETs and the (–) terminals of CIN.
SENSE 1, SENSE 2: Connects to the (–) input for the
current comparators. SENSE1 is internally connected to
the first controllers VOUT sensing point preventing true
remote output voltage sensing operation. The first con-
troller can only be used as a 3.3V or 5.0V regulator
controlled by the VPROG1 pin. The second controller can be
set to a 3.3V, 5.0V or an adjustable regulator controlled by
the VPROG2 pin (see Table 1).
Table 1. Output Voltage Table
LTC1538-AUX
LTC1539
CONTROLLER 1
5V or 3.3V Only, Secondary Feedback Loop
CONTROLLER 2
Adjustable Only
5V/3.3V/Adjustable
Remote Sensing
Remote Sensing
POR1 Output


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