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參數(shù)資料
| 型號： | L4992 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | TRIPLE OUTPUT POWER SUPPLY CONTROLLER |
| 中文描述： | 三路輸出電源控制器 |
| 文件頁數(shù)： | 1/26頁 |
| 文件大?。?/td> | 296K |
| 代理商： | L4992 |
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L4992
TRIPLE OUTPUT POWER SUPPLY CONTROLLER
DUAL PWM BUCK CONTROLLERS (3.3V
and 5.1V)
12V/120mA LINEAR REGULATOR
DUAL SYNCH RECTIFIERS DRIVERS
96% EFFICIENCY ACHIEVABLE
50
μ
A (@ 12V) STAND BY CONSUMPTION
5.5V TO 25V SUPPLY VOLTAGE
EXCELLENT LOAD TRANSIENT RESPONSE
DISABLE PULSE SKIPPING FUNCTION
POWER MANAGEMENT:
- UNDER AND OVERVOLTAGE OUTPUT
DETECTION
- POWER GOOD SIGNAL
- SEPARATED DISABLE
THERMAL SHUTDOWN
PACKAGE: TQFP32
APPLICATION
NOTEBOOK AND SUBNOTEBOOK COM-
PUTERS
PEN TOP AND PORTABLE EQUIPMENT
COMMUNICATING COMPUTERS
DESCRIPTION
The L4992 is a sophisticated dual PWM step-
down controller and power monitor intended for
Notebook computer and/or battery powered
equipment. The device produces regulated
+3.3V, +5.1V and 12V supplies for use in portable
and PCMCIA applications.
The internal architecture allows to operate with
minimum external components count. A very high
switching frequency (200/300 KHz or externally
synchronizable) optimizes their physical dimen-
sions.
Synchronous rectification and pulse skipping
mode for the buck sections optimise the overall
efficiency over a wide load current range (96% ef-
ficiency @1A/5.1V and 93% efficiency @
0.05A/5.1V.
The two high performance PWM controllers for
+3.3V and +5.1V lines are monitored for overvol-
tage, undervoltage and overcurrent conditions.
On detection of a fault, a POWER GOOD signal
is generated and a specific shutdown procedure
takes place to prevent physical damage and data
corruption.
A disable function allows to manage the output
power sections separately, optimising the quies-
cent consumption of the IC in stand-by conditions.
June 2000
SYNC
POWER
MANAGEMENT
& SYSTEM
SUPERVISOR
5.5V
to
25V
3.3V
5.1V
POWER
SECTION
L4992
μ
P
MEMORY
PERIPHERALS
12V LDO
5.1V LDO
3.39V REF
D96IN429A
POWER GOOD
SYSTEM BLOCK DIAGRAM
TQFP32
ORDERING NUMBER: L4992
1/26
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|---|---|
| L4993 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Low drop voltage regulator |
| L4993D | 功能描述:低壓差穩(wěn)壓器 - LDO Low drop voltage regulator 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(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| L4993DTR | 功能描述:低壓差穩(wěn)壓器 - LDO Low drop voltage regulator 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(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| L4993MD | 功能描述:低壓差穩(wěn)壓器 - LDO Low drop voltage regulator 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(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| L4993MDTR | 功能描述:低壓差穩(wěn)壓器 - LDO 5V 150mA LW DROP VLT REGULATOR 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(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
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