參數(shù)資料
型號： L4992
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, 300 kHz SWITCHING FREQ-MAX, PQFP32
封裝： TQFP-32
文件頁數(shù)： 20/26頁
文件大小： 296K
代理商： L4992
PIN FUNCTIONS
N.
Name
Description
1
H5STRAP
+5.1V section bootstrap capacitor connection
2VIN
Device supply voltage. From 5.5 to 25V
3
REG5
+5V regulator supply. Used mainly for bootstrap capacitors. It should be bypassed to ground.
4
V5SW
Alternative device supply voltage. When the +5.1V section is operating, the device is no
longer powered through VIN but through this pin.
5
V5SNS
This pin connects to the (-) input of the +5.1V internal current sense comparator
6
I5SNS
This pin connects to the (+) input of the +5.1V internal current sense comparator
7
COMP5
Feedback input for the +5.1V section.
8
SOFT5
Soft-start input of the +5.1V section. The soft-start time is programmed by an external
capacitor connected between this pin and SGND. Approximately, 1ms/nF @ full load.
9
CRST
Input used for start-up and shut-down timing. A capacitor defines a time of 2ms/nF.
10
PWROK
Power-good diagnostic signal. This output is driven high when both switching sections are
enabled and running properly, after a delay defined by the CRST capacitor.
11
RUN5
Control input to enable/disable the 5.1V section. A high level (>2.4V) enables this section, a
low level (<0.8V) shuts it down
12
VREF
Internal +3.39V high accuracy voltage generator. It can source 5mA to external load. Bypass
to ground with a 4.7
F capacitor to reduce noise.
13
SGND
Signal ground. Reference for internal logic circuitry. It must be routed separately from high
current returns.
14
NOSKIP
Pulse skipping mode control. A high level (>2.4V) disables pulse skipping at low load current,
a low level (<0.8V) enables it.
15
OSC
Oscillator frequency control: connect to 2.5V to select 300KHz operation, to ground or to 5V
for 200KHz operation. A proper external signal can synchronize the oscillator
16
RUN3
Control input to enable/disable the +3.3V section. A high level (>2.4V) enables this section, a
low level (>0.8V) shuts it down.
17
SOFT3
Soft-start input for the 3.3V section. The soft-start time is programmed by an external
capacitor connected between this pin and GND. Approximately, 1ms/nF @full load.
18
COMP3
Feedback input for the +3.3V section
19
I3SNS
This pin connects to the (+) input of the +3.3V internal current sense comparator
20
V3SNS
This pin connects to the (-) input of the +3.3V internal current sense comparator
21
V13IN
12V regulator input supply voltage, included between 13 and 20V. This voltage can be
supplied by a flyback winding on +3.3V inductor
22
REG12
12V regulator output voltage. It can source up to 150mA to an external load
23
SGND
To be connected to pin 13
24
H3STRAP
+3.3V section bootstrap capacitor connection
25
H3GATE
Gate- driver output for the +3.3V high-side N-MOS
26
H3SRC
+3.3V high-side N-MOS source connection
27
R3GATE
Gate- driver output for the +3.3V low- side N-MOS (synchronous rectifier).
28
PGND3
Current return for +3.3V section drivers
29
PGND5
Current return for +5.1V section drivers
30
R5GATE
Gate-driver output for the +5.1V low-side N-MOS (synchronous rectifier).
31
H5SRC
+5.1V high-side N-MOS source connection
32
H5GATE
Gate-driver output for the +5.1V high-side N-MOS
L4992
3/26
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
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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