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參數(shù)資料
| 型號： | LM2631MTC-ADJ/NOPB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 345 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封裝： | TSSOP-20 |
| 文件頁數(shù)： | 7/12頁 |
| 文件大?。?/td> | 683K |
| 代理商： | LM2631MTC-ADJ/NOPB |
Electrical Characteristics (Continued)
Specifications in standard type face are for T
j = 25C and those with boldface type apply over full operating junction tem-
perature range. V
IN =10V, GND = PGND = 0V,unless otherwise stated. (Notes 5, 6)
Symbol
Parameter
Conditions
Typical
Limit
Units
V
REF
Reference Voltage (Line
Regulation)
4.5V < V
IN < 30V
1.238
V
1.219/1.219
V(min)
1.251/1.262
V(max)
Reference Voltage (Load
Regulation)
0A < I
REF < 50 A
1.238
V
1.219/1.219
V(min)
1.251/1.262
V(max)
Logic Inputs and Outputs
V
IH
Minimum High Level Input Voltage
(SD, FPWM and SYNC)
2.4
V(min)
V
IL
Maximum Low Level Input Voltage
(FPWM and SYNC)
0.8
V(max)
Maximum Low Level Input Voltage
(SD)
0.5
V(max)
Maximum Input Leakage Curren1t
(SD , FPWM and SYNC)
Logic Input Voltage 0V or 5V
±0.1
A
V
OH
PGOOD High Level Output Voltage PGOOD Sourcing 50 A
2.7
V
2.4
V(min)
V
OL
PGOOD Low Level Output Voltage PGOOD Sinking 50 A
0
V
0.5
V(max)
Note 1: Absolute maximum ratings indicate limits beyond which damage to the device may occur. Electrical specifications do not apply when operating the device
outside of its rated operating conditions.
Note 2: The maximum allowable power dissipation is calculated by using PDmax =(TJmax -TA)/θJA , where TJmax is the maximum junction temperature, TA is the
ambient temperature, and
θJA is the junction-to-ambient thermal resistance of the specified package. The 720 mW rating results from using 160C, 70C, and
125C/W for TJmax,TA, and θJA respectively. A θJA of 125C/W represents the worst-case condition of no heat sinking of the 20-pin TSSOP. Heat sinking allows the
safe dissipation of more power. The Absolute Maximum power dissipation must be derated by 8 mW per C above 70C ambient. The LM263 actively limits its
junction temperature to about 160C.
Note 3: For detailed information on soldering plastic small-outline packages, refer to the Packaging Databook available from National Semiconductor Corporation.
Note 4: For testing purposes, ESD was applied using the human-body model, a 100 pF capacitor discharged through a 1.5 k
resistor.
Note 5: A typical is the center of characterization data taken with TA =TJ = 25C. Typicals are not guaranteed.
Note 6: All limits are guaranteed. All electrical characteristics having room-temperature limits are tested during production with TA =TJ = 25C. All hot and cold limits
are guaranteed by correlating the electrical characteristics to process and temperature variations and applying statistical process control.
Note 7: This limit is guaranteed by design.
Note 8: Percentage limits are determined by measuring the shutdown latch threshold at the FB pin, and dividing it by the nominal reference voltage.
Note 9: Pulling 2.94 A out of FADJ pin simulates adjusting the oscillator frequency with a 350 k
resistor connected from FADJ to GND.
Typical Performance Characteristics
Efficiency vs Load Current
(FPWM = Low, V
OUT = 3.3V)
Efficiency (FPWM = High, Input Voltage = 16V
V
OUT= 2.9V)
10093711
10093712
LM2631
www.national.com
4
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