參數(shù)資料
型號： LM20242MHE
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 穩(wěn)壓器
英文描述： 36V, 2A PowerWise㈢ Adjustable Frequency Synchronous Buck Regulator
中文描述： 4.65 A SWITCHING REGULATOR, 825 kHz SWITCHING FREQ-MAX, PDSO20
封裝： TSSOP-20
文件頁數(shù)： 3/20頁
文件大小： 384K
代理商： LM20242MHE
Absolute Maximum Ratings
(Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
VIN to GND
BOOT to GND
BOOT to SW
SW to GND
SW to GND (Transient)
FB, EN, SS/TRK, PGOOD to
GND
Electrical Characteristics
type are for T
J
= 25°C only, limits in
bold face type
apply over the junction temperature (T
J
) range of -40°C to +125°C. Minimum
and Maximum limits are guaranteed through test, design, or statistical correlation. Typical values represent the most likely
parametric norm at T
J
= 25°C, and are provided for reference purposes only.
Symbol
Parameter
V
FB
Feedback pin voltage
-0.3V to +38V
-0.3V to +43V
-0.3V to +7V
-0.5V to +38V
-1.5V (< 20 ns)
-0.3V to +6V
VCC to GND
Storage Temperature
ESD Rating
Human Body Model (Note 2)
-0.3V to +8V
-65°C to 150°C
2kV
Operating Ratings
VIN to GND
Junction Temperature
+4.5V to +36V
40°C to + 125°C
Unless otherwise stated, the following conditions apply: V
VIN
= 12V. Limits in standard
Conditions
V
VIN
= 4.5V to 36V
V
COMP
= 500 mV to 700 mV
I
SW
= 200 mA
I
SW
= 200 mA
V
VIN
= 4.5V to 36V
V
EN
= 0V
Rising V
VIN
Min
0.788
Typ
0.8
Max
0.812
Units
V
R
HSW-DS(ON)
R
LSW-DS(ON)
I
Q
I
SD
V
UVLO
V
UVLO(HYS)
V
VCC
I
SS
I
BOOT
V
F-BOOT
Powergood
V
FB(OVP)
V
FB(OVP-HYS)
V
FB(PG)
V
FB(PG-HYS)
T
PGOOD
I
PGOOD(SNK)
I
PGOOD(SRC)
Oscillator
F
SW1
F
SW2
T
OFF-TIME
V
RT
Error Amplifier
I
FB
I
COMP(SRC)
High-Side MOSFET On-Resistance
130
225
m
m
mA
Low-Side MOSFET On-Resistance
110
190
Operating Quiescent Current
2
3
Shutdown Quiescent current
150
180
4.2
400
μA
VIN Under Voltage Lockout
3.65
3.9
V
VIN Under Voltage Lockout Hysteresis
200
mV
VCC Voltage
I
VCC
= -5 mA, V
EN
= 5V
V
SS
= 0V
V
BOOT
= 4V
I
BOOT
= -100 mA
5.5
V
Soft-Start Pin Source Current
3
5
7
μA
BOOT Diode Leakage
10
nA
BOOT Diode Forward Voltage
0.9
1.1
V
Over Voltage Protection Rising Threshold
V
FB(OVP)
/ V
FB
Δ
VFB(OVP)
/ V
FB
V
FB(PG)
/ V
FB
Δ
VFB(PG)
/ V
FB
107
110
112
3
%
Over Voltage Protection Hysteresis
2
%
PGOOD Rising Threshold
93
95
97
3
%
PGOOD Hysteresis
2
%
PGOOD delay
20
μs
PGOOD Low Sink Current
V
PGOOD
= 0.5V
V
PGOOD
= 5V
0.6
1
mA
PGOOD High Leakage Current
5
200
nA
Switching Frequency 1
R
RT
= 49.9 k
R
RT
= 249 k
R
RT
= 250 k
675
750
825
kHz
Switching Frequency 2
225
250
325
kHz
Minimum Off Time
50
ns
RT pin voltage
550
mV
Feedback pin bias current
V
FB
= 1V
V
FB
= 0V
V
COMP
= 0V
V
FB
= 1V
V
COMP
= 0.5V
I
COMP
= -50 μA to +50 μA
COMP pin open
50
nA
COMP Output Source Current
200
400
μA
I
COMP(SNK)
COMP Output Sink Current
200
350
μA
g
m
A
VOL
GBW
Error Amplifier DC Transconductance
400
515
600
μmho
Error Amplifier Voltage Gain
2000
V/V
Error Amplifier Gain-Bandwidth Product
COMP pin open
7
MHz
3
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