參數(shù)資料
型號(hào)： LTC3714EG
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： Intel Compatible, Wide Operating Range, Step-Down Controller with Internal Op Amp
中文描述： 2 A SWITCHING CONTROLLER, PDSO28
封裝： 5.30 MM, PLASTIC, SSOP-28
文件頁(yè)數(shù)： 11/28頁(yè)
文件大小： 345K
代理商： LTC3714EG
LTC3714
11
3714f
Internal Op Amp
The internal op amp allows the user to program accurate
offsets to the output voltage during power saving modes.
By connecting the OP
+
pin to the output, the OPOUT pin to
the V
OSENSE
pin and an external resistor R1 between the
OP
–
and OPOUT pins, the op amp is hooked up as a unity-
gain feedback amplifier. Resistors R2 and R3, together
with series switches, can then be placed on the OP
–
pin to
allow negative offsets to be switched onto the output
voltage (see Figures 2a and 2b). The accuracy of the offset
will depend on the matching of the external resistors R1 to
R2 and R3.*
For applications that require less accurate output offsets,
or none at all, the user can use the internal op amp for true
differential remote sensing of the output voltage by con-
necting OPOUT to V
OSENSE
and using OP
+
and OP
–
for
differential sensing across the output capacitor as shown
in Figure 2c.
INTV
CC
/EXTV
CC
Power
Power for the top and bottom MOSFET drivers and most
of the internal controller circuitry is derived from the
INTV
CC
pin. The top MOSFET driver is powered from a
floating bootstrap capacitor C
B
. This capacitor is re-
charged from INTV
CC
through an external Schottky diode
D
B
when the top MOSFET is turned off. When the EXTV
CC
pin is grounded, an internal 5V low dropout regulator
supplies the INTV
CC
power from V
IN
. If EXTV
CC
rises
above 4.7V, the internal regulator is turned off, and an
internal switch connects EXTV
CC
to INTV
CC
. This allows
a high efficiency source connected to EXTV
CC
, such as an
external 5V supply or a secondary output from the
converter, to provide the INTV
CC
power. Voltages up to
7V can be applied to EXTV
CC
for additional gate drive. If
the input voltage is low and INTV
CC
drops below 3.5V,
undervoltage lockout circuitry prevents the power
switches from turning on.
*An alternate configuration, shown in Figure 2b, can be used to program
offsets as well. Either configuration can be used, depending upon the logic
of control signals. If offsets are not required, the op amp can be used to
remotely sense the output voltage, proving true differential sense.
OPERATIOU
–
+
OP
+
17
V
OUT
OP
–
16
OPV
IN
15
OPOUT
18
R2
SLEEP
MODE
OFFSET
R1
R3
BATTERY
MODE
OFFSET
V
OSENSE
23
3714 F02b
V
FB
22
VID DAC
Figure 2a
Figure 2b
3714 F02b
–
+
OP
+
17
V
OUT
BATTERY
MODE
OFFSET
SLEEP
MODE
OFFSET
OP
–
16
OPV
IN
15
R2
18
R1
R3
R1
R2
V
FB
22
VID DAC
23
Figure 2c
3714 F02c
–
+
OP
+
17
V
OUT+
V
OUT–
OP
–
16
OPV
IN
OPOUT V
OSENSE
18
15
R
R
R
23
R
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LTC3714EG#TRPBF 功能描述:IC STP-DWN CNTRLR W/OPAMP 28SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標(biāo)準(zhǔn)包裝:43 系列:- 應(yīng)用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數(shù):1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:48-QFN（7x7） 包裝:管件
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