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參數(shù)資料
| 型號： | LTC1708EG-PG |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Dual Adjustable 5-Bit VID High Efficiency, 2-Phase Current Mode Synchronous Buck Regulator Controller |
| 中文描述： | 3 A DUAL SWITCHING CONTROLLER, 310 kHz SWITCHING FREQ-MAX, PDSO36 |
| 封裝： | 0.209 INCH, PLASTIC, SSOP-36 |
| 文件頁數(shù)： | 8/32頁 |
| 文件大小： | 358K |
| 代理商： | LTC1708EG-PG |
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8
LTC1708-PG
RUN/SS1, RUN/SS2 (Pins 1, 23):
Combination of soft-
start, run control inputs and short-circuit detection timers.
A capacitor to ground at each of these pins sets the ramp
time to full output current. Forcing either of these pins
back below 1.0V causes the IC to shut down the circuitry
required for that particular controller. Latchoff overvolt-
age protection is also invoked via this pin as described in
the Applications Information section.
SENSE1
+
, SENSE2
+
(Pins 2, 14):
The (+) Input to the
Differential Current Comparators. The I
th
pin voltage and
built-in offsets between the SENSE
–
and SENSE
+
pins in
conjunction with R
SENSE
sets the current trip threshold.
SENSE1
–
, SENSE2
–
(Pins 3, 13):
The (–) Input to the
Differential Current Comparators.
EAIN1, EAIN2 (Pins 4, 12):
Receives the remotely sensed
feedback voltage for each controller from a resistive
divider across the output. The VID section may be used for
one resistive divider.
FREQSET (Pin 5):
Frequency Control Input to the Oscilla-
tor. This pin can be left open, tied to ground, tied to INTV
CC
or driven by an external voltage source. This pin can also
be used with an external phase detector to build a true
phase-locked loop.
STBYMD (Pin 6):
Control pin that determines which cir-
cuitry remains active when the controllers are shut down
and/or provides a common control point to shut down
both controllers. See the Operation section for details.
FCB (Pin 7):
Forced Continuous Control Input. This input
acts on both controllers and is normally used to regulate
a secondary winding using a resistive divider. An applied
input voltage below 0.8V will force continuous synchro-
nous operation on both controllers. Do not leave this pin
floating.
I
TH1,
I
TH2
(Pins 8, 11):
Error Amplifier Output and Switch-
ing Regulator Compensation Point. Each associated chan-
nels’ current comparator trip point increases with this
control voltage.
SGND (Pin 9):
Small-Signal Ground. Common to both
controllers, this pin must be routed separately from high
current grounds to the common (–) terminals of the
C
OUT
capacitors.
3.3V
OUT
(Pin 10):
Output of a linear regulator capable of
supplying 10mA DC with peak currents as high as 50mA.
ATTNOUT (Pin 15):
Divided down output voltage feeding
the EAIN pin of the regulator. The VID inputs program a
resistive divider between ATTNIN and SGND. ATTNOUT is
the tap point on the divider. The voltage on ATTNOUT is
0.8V when the output is in regulation. This pin can be
bypassed to SGND with 50pF.
ATTNIN (Pin 16):
Receives the remotely sensed feedback
voltage from the output.
VID0 to VID4 (Pins 17 to 21):
Digital inputs for controlling
the output voltage from 0.925V to 2.0V. Table 1 specifies
the output voltage for the 32 combinations of digital
inputs. The LSB (VID0) represents 50mV increments in
the upper voltage range (2.00V to 1.30V) and 25mV
increments in the lower voltage range (1.275V to 0.925V).
Logic Low = GND, Logic High = VIDV
CC
or Float.
VIDV
CC
(Pin 22):
VID Input Supply Voltage. Range from
2.7V to 5.5V. Typically this pin is tied to INTV
CC
.
PGND (Pin 28):
Driver Power Ground. Connects to the
sources of bottom (synchronous) N-channel MOSFETs, an-
ode of the Schottky rectifier and the (–) terminal(s) of C
IN
.
INTV
CC
(Pin 29):
Output of the Internal 5V Linear Low
Dropout Regulator and the EXTV
CC
Switch. The driver and
control circuits are powered from this voltage source. Must
be decoupled to power ground with a minimum of 4.7
μ
F
tantalum or other low ESR capacitor. The INTV
CC
regulator
standby function is determined by the STBYMD pin.
EXTV
CC
(Pin 30):
External Power Input to an Internal
Switch Connected to INTV
CC
. This switch closes and
supplies V
CC
power, bypassing the internal
low dropout
regulator, whenever EXTV
CC
is higher than 4.7V. See
EXTV
CC
connection in Applications Information section.
Do not exceed 7V on this pin.
BG1, BG2 (Pins 31, 27):
High Current Gate Drives for
Bottom (Synchronous) N-Channel MOSFETs. Voltage
swing at these pins is from ground to INTV
CC
.
V
IN
(Pin 32):
Main Supply Pin. A bypass capacitor should
be tied between this pin and the signal ground pin.
PIU
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| LTC1708EG-PG#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 36-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX |
| LTC1708EG-PG#TR | 功能描述:IC REG CTRLR BUCK PWM CM 36-SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX |
| LTC1708EG-PG#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 36-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX |
| LTC1709EG | 功能描述:IC REG CTRLR BUCK PWM CM 36-SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX |
| LTC1709EG#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 36-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,000 系列:- PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1.5MHz 占空比:66.7% 電源電壓:4.75 V ~ 5.25 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR) |
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