參數(shù)資料
型號(hào)： LTC1778-1
廠商： Linear Technology Corporation
英文描述： Wide Operating Range, No RSENSE Step-Down Controller
中文描述： 寬工作，無(wú)檢測(cè)電阻范圍步降控制器
文件頁(yè)數(shù)： 7/24頁(yè)
文件大?。?/td> 303K
代理商： LTC1778-1
7
LTC1778/LTC1778-1
1778fa
PIU
RUN/SS (Pin 1):
Run Control and Soft-Start Input. A
capacitor to ground at this pin sets the ramp time to full
output current (approximately 3s/
μ
F) and the time delay
for overcurrent latchoff (see Applications Information).
Forcing this pin below 0.8V shuts down the device.
PGOOD (Pin 2, LTC1778):
Power Good Output. Open
drain logic output that is pulled to ground when the output
voltage is not within
±
7.5% of the regulation point.
V
ON
(Pin 2, LTC1778-1):
On-Time Voltage Input. Voltage
trip point for the on-time comparator. Tying this pin to the
output voltage or an external resistive divider from the
output makes the on-time proportional to V
OUT
. The
comparator input defaults to 0.7V when the pin is grounded
or unavailable (LTC1778) and defaults to 2.4V when the
pin is tied to INTV
CC
. Tie this pin to INTV
CC
in high V
OUT
applications to use a lower R
ON
value.
V
RNG
(Pin 3):
Sense Voltage Range Input. The voltage at
this pin is ten times the nominal sense voltage at maxi-
mum output current and can be set from 0.5V to 2V by a
resistive divider from INTV
CC
. The nominal sense voltage
defaults to 70mV when this pin is tied to ground, 140mV
when tied to INTV
CC
.
FCB (Pin 4):
Forced Continuous Input. Tie this pin to
ground to force continuous synchronous operation at low
load, to INTV
CC
to enable discontinuous mode operation
at low load or to a resistive divider from a secondary output
when using a secondary winding.
I
TH
(Pin 5):
Current Control Threshold and Error Amplifier
Compensation Point. The current comparator threshold
increases with this control voltage. The voltage ranges
from 0V to 2.4V with 0.8V corresponding to zero sense
voltage (zero current).
SGND (Pin 6):
Signal Ground. All small-signal compo-
nents and compensation components should connect to
this ground, which in turn connects to PGND at one point.
I
ON
(Pin 7):
On-Time Current Input. Tie a resistor from V
IN
to this pin to set the one-shot timer current and thereby set
the switching frequency.
V
FB
(Pin 8):
Error Amplifier Feedback Input. This pin
connects the error amplifier input to an external resistive
divider from V
OUT
.
EXTV
CC
(Pin 9):
External V
CC
Input. When EXTV
CC
ex-
ceeds 4.7V, an internal switch connects this pin to INTV
CC
and shuts down the internal regulator so that controller
and gate drive power is drawn from EXTV
CC
. Do not exceed
7V at this pin and ensure that EXTV
CC
< V
IN
.
V
IN
(Pin 10):
Main Input Supply. Decouple this pin to
PGND with an RC filter (1
, 0.1
μ
F).
INTV
CC
(Pin 11):
Internal 5V Regulator Output. The driver
and control circuits are powered from this voltage. De-
couple this pin to power ground with a minimum of 4.7
μ
F
low ESR tantalum capacitor.
BG (Pin 12):
Bottom Gate Drive. Drives the gate of the
bottom N-channel MOSFET between ground and INTV
CC
.
PGND (Pin 13):
Power Ground. Connect this pin closely to
the source of the bottom N-channel MOSFET, the (–)
terminal of C
VCC
and the (–) terminal of C
IN
.
SW (Pin 14):
Switch Node. The (–) terminal of the boot-
strap capacitor C
B
connects here. This pin swings from a
diode voltage drop below ground up to V
IN
.
TG (Pin 15):
Top Gate Drive. Drives the top N-channel
MOSFET with a voltage swing equal to INTV
CC
superim-
posed on the switch node voltage SW.
BOOST (Pin 16):
Boosted Floating Driver Supply. The (+)
terminal of the bootstrap capacitor C
B
connects here. This
pin swings from a diode voltage drop below INTV
CC
up to
V
IN
+ INTV
CC
.
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參數(shù)描述
LTC1778EGN 功能描述:IC REG CTRLR BUCK PWM CM 16-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:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無(wú) 升壓:是 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR)
LTC1778EGN#PBF 功能描述:IC REG CTRLR BUCK PWM CM 16-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:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無(wú) 升壓:是 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR)
LTC1778EGN#TR 功能描述:IC REG CTRLR BUCK PWM CM 16-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:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無(wú) 升壓:是 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR)
LTC1778EGN#TRPBF 功能描述:IC REG CTRLR BUCK PWM CM 16-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:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無(wú) 升壓:是 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR)
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