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(yè)數(shù)： 16/32頁(yè)
文件大小： 451K
代理商： LTC1539
16
LTC 1538-AUX/LTC 1539
APPLICATIO
S I
FOR
ATIO
U
W
U
U
+
+
V
IN
V
IN
V
OUT
+
C
OUT
1538 F04b
1
μ
F
0.22
μ
F
R
SENSE
C
IN
TGL1
N-CH
N-CH
N-CH
VN2222LL
LTC1538-AUX
LTC1539*
L1
BAT85
BAT85
BAT85
TGS1*
SW1
BG1
PGND
EXTV
CC
*TGS1 ONLY AVAILABLE ON THE LTC1539
+
+
+
V
IN
V
IN
V
SEC
V
OUT
C
OUT
1538 F04a
1
μ
F
R
SENSE
C
IN
TGL1
N-CH
OPTIONAL EXTV
CC
CONNECTION
5V
≤
V
SEC
≤
9V
N-CH
R5
N-CH
1N4148
LTC1538-AUX
LTC1539*
L1
1:1
TGS1*
SW1
BG1
PGND
SGND
SFB1
EXTV
CC
R6
*TGS1 ONLY AVAILABLE ON THE LTC1539
Figure 4a. Secondary Output Loop and EXTV
CC
Connection
Figure 4b. Capacitive Charge Pump for EXTV
CC
greater than 4.8V. This can be done with either the
inductive boost winding as shown in Figure 4a or the
capacitive charge pump shown in Figure 4b. The charge
pump has the advantage of simple magnetics.
4. EXTV
CC
connected to an external supply. If an external
supply is available in the 5V to 10V range (EXTV
CC
≤
V
IN
)
it may be used to power EXTV
CC
providing it is compat-
ible with the MOSFET gate drive requirements. When
driving standard threshold MOSFETs, the external sup-
ply must be always present during operation to prevent
MOSFET failure due to insufficient gate drive. Note: care
must be taken when using the connections in items 3 or
4. These connections will effect the INTV
CC
voltage
when either or both controllers are on.
Topside MOSFET Driver Supply (C
B
,D
B
)
External bootstrap capacitors C
B
connected to the BOOST
1 and BOOST 2 pins supply the gate drive voltages for the
topside MOSFETs. Capacitor C
B
in the Functional Diagram
is charged through diode D
B
from INTV
CC
when the
SW1(SW2) pin is low. When one of the topside MOSFETs
is to be turned on, the driver places the C
B
voltage across
the gate source of the desired MOSFET. This enhances the
MOSFET and turns on the topside switch. The switch node
voltage SW1(SW2) rises to V
IN
and the BOOST 1(BOOST
2) pin follows. With the topside MOSFET on, the boost
voltage is above the input supply: V
BOOST
= V
IN
+ V
INTVCC
.
The value of the boost capacitor C
B
needs to be 100 times
that of the total input capacitance of the topside MOSFET(s).
The reverse breakdown on D
B
must be greater than
V
IN(MAX)
.
Output Voltage Programming
The LTC1538-AUX/LTC1539 have pin selectable output
voltage programming. The output voltage is selected by
the V
PROG1
(V
PROG2
) pin as follows:
V
PROG1,2
= 0V
V
PROG1,2
= INTV
CC
V
PROG2
= Open (DC)
The top of an internal resistive divider is connected to
SENSE
–
1 pin in Controller 1. For fixed output voltage
applications the SENSE
–
1 pin is connected to the output
voltage as shown in Figure 5a. When using an external
resistive divider for Controller 2, the V
PROG2
pin is left open
V
OUT1,2
= 3.3V
V
OUT1,2
= 5V
V
OUT2
= Adjustable
LTC1538-AUX
LTC1539
V
PROG2
*
V
OSENSE2
SGND
OPEN (DC)
1.19V
≤
V
OUT
≤
9V
1538 F05b
100pF
R2
R1
R2
R1
V
OUT
= 1.19V 1 +
(
)
*LTC1539 ONLY
Figure 5b. LTC1538-AUX/LTC1539 Adjustable Applications
Figure 5a. LTC1538-AUX/LTC1539 Fixed Output Applications
LTC1538-AUX
LTC1539
V
PROG1
SENSE
–
1
SGND
GND: V
= 3.3V
INTV
CC
: V
OUT
= 5V
+
V
OUT
1538 F05a
C
OUT
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