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参数资料
| 型号： | LTC4222CUH#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 电源管理 |
| 英文描述： | 2-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC32 |
| 封装： | 5 X 5 MM, LEAD FREE, PLASTIC, MO-220WHHD-X, QFN-32 |
| 文件页数： | 2/32页 |
| 文件大小： | 280K |
| 代理商： | LTC4222CUH#TRPBF |
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LTC4222
10
4222fa
SCL: Serial Bus Clock Input. Data at the SDA pin is shifted
in or out on rising edges of SCL. This is a high impedance
pin that is generally driven by an open-collector output
from a master controller. An external pull-up resistor or
current source is required.
SDAO: (SSOP Package) Serial Bus Data Output. Open-
drain output for sending data back to the master control-
ler or acknowledging a write operation. Normally tied to
SDAI to form the SDA line. An external pull-up resistor
or current source is required. Internally tied to SDAI in
QFN package.
SDAI: (SSOP Package) Serial Bus Data Input. A high im-
pedance input for shifting in address, command or data
bits. Normally tied to SDAO to form the SDA line. Internally
tied to SDAO in QFN package.
SDA: (QFN Package) Serial Bus Data Input/Output Line.
Formed by internally tying the SDAO and SDAI lines
together. An external pull-up resistor or current source
is required.
SENSE1–, SENSE2–:
Negative Current Sense Input. Con-
nect this pin to the output of the current sense resistor. The
current limit circuit controls the corresponding GATE pin
voltage to limit the sense voltage between the SENSE+ and
SENSE– pins to the level set by the soft-start and foldback
characteristic, with a maximum of 50mV during start-up
and to 150mV independent of soft-start and foldback after
the start-up timer has expired. A circuit breaker, enabled
after start-up, trips when the sense voltage exceeds 50mV
for 20μs.
SENSE1+, SENSE2+:
(SSOP Package) Positive Current
Sense Input. Connect this pin to the input of the current
sense resistor. It must be connected to the same trace as
VDDn. Internally tied to VDDn in the QFN package.
SOURCE1, SOURCE2: N-Channel MOSFET Source and
ADC Input. Connect this pin to the source of the external
N-channel MOSFET switch for gate drive return. This pin
also serves as the ADC input to monitor output voltage.
The pin provides a return for the gate pull-down circuit.
SS: Soft-Start Input. Sets the inrush current slew rate at
start-up. Connect a 68nF capacitor to provide 5mV/ms as
the slew rate for the sense voltage in start-up. This cor-
responds to 1A/ms with a 5mΩ sense resistor. Note that
a large soft-start capacitor and a small TIMER capacitor
may result in a condition where the timer expires before
the inrush current has started. Allow an additional 2nF of
timer capacitance per 1nF of soft-start capacitor to ensure
proper start-up.
TIMER: Start-Up Timer Input. Connect a capacitor be-
tween this pin and ground to set a 12.3ms/μF duration
for start-up, after which an overcurrent fault is logged if
the inrush is still current limited. The duration of the off
time is 600ms/μF when overcurrent auto-retry is enabled,
resulting in a 1:50 duty cycle. An internal timer provides
a 100ms start-up time and 5 second auto-retry time if
this pin is tied to INTVCC. Allow an additional 2nF of timer
capacitance per 1nF of soft-start (SS) capacitor to ensure
proper start-up.
UV1, UV2: Undervoltage Comparator Input. Connect this
pin to an external resistive divider from VDD. If the volt-
age at this pin falls below 1.145V, an undervoltage fault
is detected and the GATE turns off. Pulling this pin below
0.4V resets the fault register for that channel except for
the UV fault bit. Tie to INTVCC if unused.
VDD1, VDD2: Supply Voltage Input and Positive Current
Sense Input. This pin has an undervoltage lockout threshold
of 2.43V. In the QFN package this pin is also the positive
current sense input.
PIN FUNCTIONS
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| LTC4222IG#TRPBF | 功能描述:IC CTRLR DUAL HOT SWAP 36-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:119 系列:- 类型:热交换控制器 应用:通用型，PCI Express? 内部开关:无 电流限制:- 电源电压:3.3V，12V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:80-TQFP 供应商设备封装:80-TQFP（12x12） 包装:托盘 产品目录页面:1423 (CN2011-ZH PDF) |
| LTC4222IG-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Hot Swap Controller with I2C Compatible Monitoring |
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| LTC4222IUH#PBF | 功能描述:IC CTRLR DUAL HOT SWAP 32-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:119 系列:- 类型:热交换控制器 应用:通用型，PCI Express? 内部开关:无 电流限制:- 电源电压:3.3V，12V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:80-TQFP 供应商设备封装:80-TQFP（12x12） 包装:托盘 产品目录页面:1423 (CN2011-ZH PDF) |
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