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參數(shù)資料
| 型號： | 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 |
| 文件頁數(shù)： | 7/27頁 |
| 文件大?。?/td> | 1336K |
| 代理商： | LM27241MTC |
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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)
62
0
-2.2
Max
Units
I
ILIM
V
ILIM_TH
V
SW_ZERO
ILIM Pin Current (sourcing)
I
ILIM
Threshold Voltage
Zero-cross Threshold (SW
Pin)
V
ILIM
= 0V
46
-10
76
10
μA
mV
mV
LDRV goes low
Oscillator
F
OSC
PWM Frequency
R
FADJ
= 22.1k
R
FADJ
= 12.4k
R
FADJ
= 30.9k
VIN = 15V
VIN = 24V
255
300
500
200
1.6
2.95
0.8
±
1
345
kHz
V
RAMP
PWM Ramp Peak-to-peak
Amplitude
V
V
VALLEY
F
OSC_VIN
PWM Ramp Valley
Frequency Change with
VIN
Frequency Change with
VDD
FREQ Pin Voltage vs. VIN
V
%
VIN = 5.5V to 24V
F
OSC_VDD
VDD = 4.5V to 5.5V
±
2
%
V
FREQ_VIN
System
t
ON_MIN
D
MAX
0.105
V/V
Minimum ON Time
Maximum Duty Cycle
V
FPWM
= 3V
VIN = 5.5V
VIN = 15V
VIN = 28V, VDD= 4.5V
30
75
50
28
ns
%
%
%
60
40
22
Gate Drivers
R
HDRV_SOURCE
HDRV Source Impedance
HDRV Pin Current
(sourcing)= 1.2A
HDRV Pin Current (sinking)
= 1A
LDRV Pin Current (sourcing)
= 1.2A
LDRV Pin Current (sinking)
= 2A
HDRV Falling to LDRV
Rising
LDRV Falling to HDRV
Rising
7
R
HDRV_SINK
HDRV Sink Impedance
2
R
LDRV_SOURCE
LDRV Source Impedance
7
R
LDRV_SINK
LDRV Sink Impedance
1
t
DEAD
Cross-conduction
Protection Delay
(deadtime)
40
ns
70
Note 1:
Absolute maximum ratings indicate limits beyond which damage to the device may occur. Operating Ratings are conditions under which operation of the
device is guaranteed. For guaranteed performance limits and associated test conditions, see the Electrical Characteristics table.
Note 2:
PGND and SGND are all electrically connected together on the PCB.
Note 3:
The maximum allowable power dissipation is calculated by using P
= (T
- T
) /
θ
, where T
is the maximum junction temperature, T
is the
ambient temperature, and
θ
is the junction-to-ambient thermal resistance of the specified package. The 0.75W rating of the TSSOP-20 package for example results
from using 125C, 25C, and 118C/W for T
, T
, and
θ
respectively. The rated power dissipation should be derated by 10mW/C above 25C ambient for the
TSSOP package. The
θ
value above represents the worst-case condition with no heat sinking. Heat sinking will permit more power to be dissipated at higher
ambient temperatures. For detailed information on soldering plastic TSSOP package, refer to http://www.national.com/packaging/.
Note 4:
ESD is applied by the human body model, which is a 100pF capacitor discharged through a 1.5 k
resistor into each pin.
Note 5:
R
FADJ
is the frequency adjust resistor between FREQ pin and Ground.
Note 6:
If the LM27241 starts up with a pre-charged soft start capacitor, it will first discharge the capacitor to V
SS_RESET
and then begin the normal Soft-start
process.
Note 7:
Typical numbers are at 25C and represent the most likely norm.
L
www.national.com
7
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| LM27241MTC/NOPB | 功能描述:IC REG CTRLR BUCK PWM VM 20TSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,000 系列:- PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1.5MHz 占空比:66.7% 電源電壓:4.75 V ~ 5.25 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR) |
| LM27241MTCX | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Synchronous Buck Regulator Controller for Mobile Systems |
| LM27241MTCX/NOPB | 功能描述:IC REG CTRLR BUCK PWM VM 20TSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:100% 電源電壓:8.2 V ~ 30 V 降壓:無 升壓:無 回掃:是 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:是 工作溫度:0°C ~ 70°C 封裝/外殼:8-DIP（0.300"，7.62mm） 包裝:管件 產(chǎn)品目錄頁面:1316 (CN2011-ZH PDF) |
| LM27243A E WAF | 制造商:Texas Instruments 功能描述: |
| LM2724A | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:High Speed 3A Synchronous MOSFET Driver |
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