參數(shù)資料
型號(hào)： LM27241MTC
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 穩(wěn)壓器
英文描述： Synchronous Buck Regulator Controller for Mobile Systems
中文描述： SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO20
封裝： PLASTIC, TSSOP-20
文件頁(yè)數(shù)： 6/27頁(yè)
文件大小： 1336K
代理商： LM27241MTC
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
= V
= 0V, VIN = 15V, V
= 3V, R
= 22.1K unless otherwise stated (Note 5).
Datasheet min/max specification limits are guaranteed by design, test, or statistical analysis.
Symbol
Parameter
Conditions
Min
Typical
(Note 7)
Max
Units
Power Good
V
PGOOD_HI
Power Good Upper
Threshold as a Percentage
of Internal Reference
Power Good Lower
Threshold as a Percentage
of Internal Reference
Power Good Hysteresis
Power Good Delay
FB voltage rising above
V
FB_REG
110
113
116
%
V
PGOOD_LOW
FB voltage falling below
V
FB_REG
84
87
90
%
HYS
PGOOD
t
PG_OK
7
20
%
μs
From output voltage “good”
to PGOOD assertion.
From the 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
0.1
V
PGND_SAT
PGOOD Saturation Voltage
0.12
0.4
V
I
PGOOD_LEAK
OV and UV Protection
V
OVP_RISING
PGOOD Leakage Current
0
1
μA
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
%
V
OVP_FALLING
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)
Soft-start Discharge
Current
Soft-start pin reset voltage
(Note 6)
SS to COMP Offset
Voltage
V
SS
= 1V
V
EN
= 0V, V
SS
= 1V
8
11
1800
14
μA
I
SS_DCHG
In Current Limit
80
115
160
μA
V
SS_RESET
SS charged to 0.5V, EN low
to high
V
SS
= 0.5V and 1V, V
FB
=
0V
100
mV
V
OS
600
mV
Error Amplifier
GAIN
V
SLEW
DC Gain
Voltage Slew Rate
70
4.45
2.25
6.5
5
dB
V/μs
COMP rising
COMP falling
BW
I
COMP_SOURCE
Unity Gain Bandwidth
COMP Source Current
MHz
mA
V
FB
<
V
FB_REG
V
COMP
= 0.5V
V
FB
>
V
FB_REG
V
COMP
= 0.5V
2
I
COMP_SINK
COMP Sink Current
7
14
mA
Current Limit and Zero-Cross
L
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LM27241MTCX 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Synchronous Buck Regulator Controller for Mobile Systems
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