參數(shù)資料
型號(hào)： LM2647LQX
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 穩(wěn)壓器
英文描述： Dual Synchronous Buck Regulator Controller
中文描述： DUAL SWITCHING CONTROLLER, 345 kHz SWITCHING FREQ-MAX, QCC28
封裝： LLP-28
文件頁數(shù)： 6/25頁
文件大?。?/td> 763K
代理商： LM2647LQX
Electrical Characteristics
(Continued)
Specifications with standard typeface are for T
= 25C, and those with
boldface
apply over full Operating Junction Tempera-
ture range. VDD = V5 = 5V, V
SGND
= V
PGND
= 0V, VIN = 15V, V
EN
= 3V, R
FADJ
= 22.1K unless otherwise stated. (Note 5)
Symbol
Parameter
Conditions
Min
(Note 6)
Typical
(Note 7)
Max
(Note 6)
Units
Power Good
V
PGOOD_HI
Power Good Upper Threshold
as a Percentage of Internal
Reference
V
PGOOD_LOW
Power Good Lower Threshold
as a Percentage of Internal
Reference
Power Good Hysteresis
t
PG_OK
Power Good Delay
FB voltage rising above V
FB_REG
110
113
116
%
FB voltage falling below V
FB_REG
84
87
90
%
7
20
%
μs
From both output voltages “good”
to PGOOD assertion.
From the first output voltage “bad”
to PGOOD de-assertion
From Enable low to PGOOD low
PGOOD de-asserted (Power Not
Good) and sinking 1.5mA
PGOOD = 5V and asserted
10
30
t
PG_NOK
4
7
10
t
SD
0.03
0.12
0.1
0.4
PGOOD Saturation Voltage
V
PGOOD Leakage Current
0
1
μA
OV and UV Protection
Fault OVP Latch Threshold
as a Percentage of Internal
Reference
Fault UVP Latch Threshold
as a Percentage of Internal
Reference
Fault Delay
FB voltage rising above V
FB_REG
125
130
135
%
FB voltage falling below V
FB_REG
65
70
75
%
t
FAULT
From Fault detection (any output)
to Fault assertion
7
μs
Soft-start
I
SS_CHG
R
SS_DCHG
Soft-start Charging Current
Soft-shutdown Resistance
(SS pin to SGND, either
channel)
Soft-start Discharge Current
Soft-start pin reset voltage
(Note 8)
SS to COMP Offset Voltage
V
SS
= 1V
V
EN
= 0V, V
SS
= 1V
8
11
1800
14
μA
I
SS_DCHG
V
SS_RESET
In Current Limit
SS charged to 0.5V, EN low to high
80
115
100
160
μA
mV
V
SS
= 0.5V and 1V, V
FB1
= V
FB2
=
0V
600
mV
Error Amplifier
GAIN
DC Gain
Voltage Slew Rate
70
4.45
2.25
6.5
5
dB
V/μs
COMP rising
COMP falling
COMP falling
V
FB
<
V
FB_REG
V
COMP
= 0.5V
V
FB
>
V
FB_REG
V
COMP
= 0.5V
BW
Unity Gain Bandwidth
COMP Source Current
MHz
mA
2
COMP Sink Current
7
14
mA
Current Limit and Zero-Cross
I
ILIM
I
LIM
Pin Current (sourcing,
either ILIM pin)
I
ILIM
Threshold Voltage
V
ILIM1
= V
ILIM2
= 0V
46
62
76
μA
-10
0
10
mV
L
www.national.com
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LM2647LQX/NOPB 功能描述:DC/DC 開關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
LM2647MTC 功能描述:DC/DC 開關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
LM2647MTC/NOPB 功能描述:DC/DC 開關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
LM2647MTCX 功能描述:DC/DC 開關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
LM2647MTCX/NOPB 功能描述:DC/DC 開關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
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