參數(shù)資料
型號(hào)： LTC1539
廠商： Linear Technology Corporation
元件分類： 基準(zhǔn)電壓源/電流源
英文描述： Dual High Efficiency, Low Noise, Synchronous Step-Down Switching Regulators
中文描述： 雙通道高效率，低噪聲，同步降壓型開關(guān)穩(wěn)壓器
文件頁數(shù)： 7/32頁
文件大?。?/td> 451K
代理商： LTC1539
7
LTC 1538-AUX/LTC 1539
TYPICAL PERFOR
M
A
CE CHARACTERISTICS
U
Auxiliary Regulator PSRR
100
Auxiliary Regulator Sink
Current Available
AUX DR VOLTAGE (V)
0
0
A
5
10
15
20
2
4
6
8
1538/39 G19
10
12
14
16
FREQUENCY (kHz)
10
P
90
80
70
60
50
40
30
20
10
0
100
1000
1538/39 G20
I
L
= 10mA
I
L
= 100mA
PI
FU
CTIO
N
S
U
U
V
IN
:
Main Supply Pin. Must be closely decoupled to the
IC’s signal ground pin.
INTV
CC
/5V STANDBY:
Output of the Internal 5V Regulator
and the EXTV
CC
Switch. The driver and control circuits are
powered from this voltage. Must be closely decoupled to
power ground with a minimum of 2.2
μ
F tantalum or
electrolytic capacitor. The INTV
CC
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.
EXTV
CC
:
External Power Input to an Internal Switch. This
switch closes and supplies INTV
CC,
bypassing the internal
low dropout regulator whenever EXTV
CC
is higher than 4.8V.
Connect this pin to V
OUT
of the controller with the higher
output voltage. Do not exceed 10V on this pin. See EXTV
CC
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 INTV
CC
to V
IN
+ INTV
CC
.
SW1, SW2:
Switch Node Connections to Inductors. Volt-
age swing at these pins is from a Schottky diode (external)
voltage drop below ground to V
IN
.
SGND:
Small Signal Ground. Common to both controllers,
must be routed separately from high current grounds to
the (–) terminals of the C
OUT
capacitors.
PGND:
Driver Power Ground. Connects to sources of
bottom N-channel MOSFETs and the (–) terminals of C
IN
.
SENSE
–
1, SENSE
–
2:
Connects to the (–) input for the
current comparators. SENSE
–
1 is internally connected to
the first controllers V
OUT
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 V
PROG1
pin. The second controller can be
set to a 3.3V, 5.0V or an adjustable regulator controlled by
the V
PROG2
pin (see Table 1).
Table 1. Output Voltage Table
LTC1538-AUX
5V or 3.3V Only, Secondary Feedback Loop
Adjustable Only
Remote Sensing
LTC1539
CONTROLLER 1
CONTROLLER 2
5V/3.3V/Adjustable
Remote Sensing
POR1 Output
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