參數(shù)資料
型號(hào)： LTC3773EG
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, 700 kHz SWITCHING FREQ-MAX, PDSO36
封裝： 5.30 MM, PLASTIC, SSOP-36
文件頁(yè)數(shù)： 13/32頁(yè)
文件大?。?/td> 461K
代理商： LTC3773EG
LTC3773
20
3773fa
SENSE+/SENSE– Pins
The common mode input range of the current compara-
tor sense pins is from 0V to (1.1)VCC. Continuous linear
operation is guaranteed throughout this range allowing
output voltage setting from 0.6V to 7.7V, depending upon
the voltage applied to VCC. A differential NPN input stage
is biased with internal resistors from an internal 2.4V
source as shown in Figure 1. This requires that current
either be sourced or sunk from the SENSE pins depending
on the regulator output voltage. If the output voltage is
below 2.4V, current will ow out of both SENSE pins to
the main output. The output can be easily preloaded by
the VOUT resistive divider to compensate for the current
comparator’s negative input bias current. The maximum
current owing out of each pair of SENSE pins is:
II
VV
k
SENSE
OUT
+ +=
–
.–
2
24
60
Since VFB is servoed to the 0.6V reference voltage, we
can choose R1 in Figure 1 to have a maximum value to
absorb this current.
Rk
V
VV
for V
V
MAX
OUT
130
06
24
()
.
.–
.
=
<
Regulating an output voltage of 1.8V, the maximum value
of R1 should be 30k. Note that for an output voltage above
2.4V, R1 has no maximum value necessary to absorb the
sense currents; however, R1 is still bounded by the VFB
feedback current.
Power Up from Shutdown
If the SDB1, SDB2 and SDB3 pins are forced below 0.4V,
the IC enters low current shutdown mode. Under this
condition, most of the internal circuit blocks, including
the reference, are disabled. The supply current drops to a
typical value of 20A. Disconnecting the external applied
voltage source allows an internal 0.5A current source to
pull up the SDBn pin. Once the voltage at any of the SDB
pins is above the shutdown threshold, the reference and
the internal biasing circuit wake up. When the voltage at
the SDBn pin goes above its power-up threshold, its driver
starts to toggle. The power-up thresholds for channels 1, 2
and 3 are set at 1.2V, 1.8V and 2.4V respectively. Adding a
small external capacitor larger than 100pF at the SDB pin
reduces the slew rate at the node, permitting the internal
circuit to settle before actual conversion begins.
LTC3773 can be easily congured to produce a sequential
power up/down supply. By adding an external capacitor
at the SDB pin; or by controlling the SDB input voltage,
channel 1 will be powered up rst, followed by channel
2 and sequentially channel 3. The channel turn on time
delay is determined by the SDB capacitor value. Figure 4
shows the sequential power up/down conguration and
its waveform. The capacitor at the TRACK pins control
the individual channel power up slew rate.
Soft-Start/Tracking
When the voltage on the TRACK pin is less than the internal
0.6V reference, the LTC3773 regulates the VFB voltage to
the TRACK pin voltage instead of 0.6V. If tracking is not
required, a soft-start capacitor should be connected to
the TRACK pin to regulate the output startup slew rate.
An internal 1A current source pull-up at the TRACK pin
programs the output to take about 600ms/F to reach its
steady state value. The output voltage ramp down slew
rate can be controlled by the external capacitor CSLEW
SDB1
SDB2
SDB3
TRACK1
TRACK2
TRACK3
LTC3773
RAMP
SOURCE
POWER
DOWN
0V TO 2V
CSLEW
1M
CSS
10k
2.5V VOUT1 1V/DIV
1.8V VOUT2 1V/DIV
1.2V VOUT3 1V/DIV
SDB
1V/DIV
0.1s/DIV
3773 F04
Figure 4. Sequential Power Up/Down
APPLICATIONS INFORMATION
相關(guān)PDF資料
PDF描述
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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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LTC3773EG#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:PolyPhase® 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(wú) 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:6-WDFN 裸露焊盤(pán) 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX
LTC3773EUHF 制造商:Linear Technology 功能描述:DC DC Cntrlr Triple-OUT Sync Step Down 3.3V to 36V Input 38-Pin QFN EP
LTC3773EUHF#PBF 功能描述:IC REG CTRLR BUCK PWM CM 38-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:PolyPhase® 特色產(chǎn)品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 標(biāo)準(zhǔn)包裝:1 系列:PowerWise® PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1MHz 占空比:81% 電源電壓:4.5 V ~ 18 V 降壓:是 升壓:無(wú) 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:-5°C ~ 125°C 封裝/外殼:32-WFQFN 裸露焊盤(pán) 包裝:Digi-Reel® 產(chǎn)品目錄頁(yè)面:1303 (CN2011-ZH PDF) 其它名稱:LM3754SQDKR
LTC3773EUHF#TRPBF 功能描述:IC REG CTRLR BUCK PWM CM 38-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:PolyPhase® 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(wú) 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:6-WDFN 裸露焊盤(pán) 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX
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