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參數資料
| 型號： | MIC29311-5.1BU |
| 廠商： | MICREL INC |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | 3A Fast-Response LDO Regulator for USB Preliminary Information |
| 中文描述： | 5.1 V FIXED POSITIVE LDO REGULATOR, 1 V DROPOUT, PSSO5 |
| 封裝： | TO-263, 5 PIN |
| 文件頁數： | 1/12頁 |
| 文件大小： | 135K |
| 代理商： | MIC29311-5.1BU |
December 1998
1
MIC29311
MIC29311
Micrel
MIC29311
3A Fast-Response LDO Regulator for USB
Preliminary Information
General Description
The MIC29311 is a 3A, fast response, low-dropout (LDO)
voltage regulator. Using Micrel’s proprietary Super
β
eta
PNP process, the MIC29311 offers exceptional dropout
(600mV at 3A) and low ground current (60mA at 3A). Fast
transient response allows it to recover quickly from large load
changes while maintaining a steady output. The device can
be sent into a “zero-current” off mode when the TTL compat-
ible enable is brought low.
Designed specifically for Universal Serial Bus (USB) applica-
tions, the MIC29311 works with USB power switches to
provide an economical solution for self-powered hubs. The
5.1V output voltage is optimized to work with lower-cost high
on-resistance USB power switches (300m
) to provide a
minimum of 4.75V at 500mA to downstream ports. Used with
MIC2527 quad USB power switches, the MIC29311 can
power up to 6 downstream ports.
Features of the MIC29311 include thermal shutdown, current
limit, reversed-battery and reversed-lead insertion protec-
tion. An overvoltage clamp is available to maintain a safe
output when the input voltage exceeds 8V. An error flag is
also available to indicate of the output falls out of regulation,
or when an overcurrent condition occurs.
The MIC29311 is available in a 5-pin TO-220 or TO-263
package with a fixed 5.1V output voltage.
For other high current, ow-dropout voltage regulators, please
see the MIC29150/300/500/750 and the MIC29310,
MIC29510, MIC29710.
Typical Application
ON/OFF
OVERCURRENT
3.3V USB Controller
V
BUS
D+
D–
GND
V
BUS
D+
D–
GND
MIC5207-3.3
LDO Regulator
IN
OUT
GND
33μF
Ferrite
Bead
V
BUS
D+
D–
GND
D+
D–
V+
Bold
lines indicate
0.1" wide, 1-oz. copper
high-current traces.
Downstream
USB
Port 1
4.75V min
500mA max.
33μF
V
BUS
D+
D–
GND
33μF
0.01μF
0.01μF
0.01μF
4.7
μF
1.0
μF
GND
33μF
6.3Vac
3A
IN
EN
OUT
FLAG
GND
MIC29311-5.1
LDO Regulator
5.8V @ 3A
5.1V
10k
47μF
10k
Downstream
USB
Port 2
4.75V min
500mA max.
Downstream
USB
Port 6
4.75V min
500mA max.
100mA
max.
AC
Line
Upstream
USB Port
Simple USB Stand-Alone 6-Port Self-Powered Hub
Features
Fast transient response
3A output current over full temperature range
600mV dropout voltage at full load
Low ground current
3% total accuracy
“Zero” off-mode current
Thermal Shutdown
Current Limiting
Reversed battery protection
Fixed 5.1V Output
Applications
Self-powered USB hubs
USB power switching
High-efficiency linear power supplies
High-efficiency switching supply post-regulator
Micrel, Inc. 1849 Fortune Drive San Jose, CA 95131 USA tel + 1 (408) 944-0800 fax + 1 (408) 944-0970 http://www.micrel.com
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相關代理商/技術參數 |
參數描述 |
|---|---|
| MIC29312BT | 功能描述:IC REG LDO ADJ 3A TO-220-5 RoHS:否 類別:集成電路 (IC) >> PMIC - 穩壓器 - 線性 系列:- 標準包裝:3,000 系列:- 穩壓器拓撲結構:正，固定式 輸出電壓:3.8V 輸入電壓:最高 16V 電壓 - 壓降（標準）:0.3V @ 80mA 穩壓器數量:1 電流 - 輸出:80mA 電流 - 限制（最小）:- 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:SC-74A，SOT-753 供應商設備封裝:SOT-23-5 包裝:帶卷 (TR) 其它名稱:MIC5203-3.8BM5TRMIC5203-3.8BM5TR-ND |
| MIC29312BTL3 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| MIC29312BU | 功能描述:IC REG LDO ADJ 3A TO-263-5 RoHS:否 類別:集成電路 (IC) >> PMIC - 穩壓器 - 線性 系列:- 標準包裝:3,000 系列:- 穩壓器拓撲結構:正，固定式 輸出電壓:3.8V 輸入電壓:最高 16V 電壓 - 壓降（標準）:0.3V @ 80mA 穩壓器數量:1 電流 - 輸出:80mA 電流 - 限制（最小）:- 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:SC-74A，SOT-753 供應商設備封裝:SOT-23-5 包裝:帶卷 (TR) 其它名稱:MIC5203-3.8BM5TRMIC5203-3.8BM5TR-ND |
| MIC29312BU TR | 功能描述:IC REG LDO ADJ 3A TO-263-5 RoHS:否 類別:集成電路 (IC) >> PMIC - 穩壓器 - 線性 系列:- 標準包裝:3,000 系列:- 穩壓器拓撲結構:正，固定式 輸出電壓:3.8V 輸入電壓:最高 16V 電壓 - 壓降（標準）:0.3V @ 80mA 穩壓器數量:1 電流 - 輸出:80mA 電流 - 限制（最小）:- 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:SC-74A，SOT-753 供應商設備封裝:SOT-23-5 包裝:帶卷 (TR) 其它名稱:MIC5203-3.8BM5TRMIC5203-3.8BM5TR-ND |
| MIC29312WT | 功能描述:低壓差穩壓器 - LDO 3.0A LDO Adj. + Shutdown (ROHS Compliant) RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調節:0.3 % 輸出端數量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
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