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參數(shù)資料
| 型號： | LXV16VB102M |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Non-synchronous Step-down Controller for Pentium Microprocessors |
| 中文描述： | 非同步降壓控制器，用于奔騰微處理器 |
| 文件頁數(shù)： | 3/8頁 |
| 文件大?。?/td> | 157K |
| 代理商： | LXV16VB102M |
LM2688-ADJ
Electrical Characteristics
(Continued)
Specifications with standard typeface are for T
J
= 25C, and those with
boldface type
apply over
full Operating Temperature
Range
. Unless otherwise specified, V
IN
= 12V, I
OUT
= 100 mA.
Symbol
Parameter
Conditions
LM2688-ADJ
Typ
(Note 3)
Units
(Limits)
Limit
(Note 4)
ON/OFF CONTROL
I
L
V
LOGIC
= 0.5V (Regulator ON)
0.02
μA
5
μA(max)
Note 1:
Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is in-
tended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics.
Note 2:
The human body model is a 100 pF capacitor discharged through a 1.5k resistor into each pin.
Note 3:
Typical numbers are at 25C and represent the most likely norm.
Note 4:
All limits guaranteed at room temperature (standard typeface) and at
temperature extremes (bold typeface)
. All room temperature limits are 100% pro-
duction tested. All limits at
temperature extremes
are guaranteed via correlation using standard Statistical Quality Control (SQC) methods. All limits are used to cal-
culate Average Outgoing Quality Level (AOQL).
Note 5:
External components such as the catch diode, inductor, input and output capacitors, and voltage programming resistors can affect switching regulator sys-
tem performance. When the LM2688 is used as shown in the typical application, system performance will be shown in system parameters section Electrical Char-
acteristics.
Note 6:
The switching frequency is reduced when the second stage current limit is activated. The amount of reduction is determined by the severity of current over-
load.
Note 7:
No diode, inductor or capacitor connected to output pin.
Note 8:
Feedback pin removed from output and connected to 0V to force the output transistor switch ON.
Note 9:
Feedback pin removed from output and connected to 12V to force the output transistor switch OFF.
Note 10:
V
IN
= 40V.
Note 11:
Junction to ambient thermal resistance with approximately 1 square inch of printed circuit board copper surrounding the leads. Additional copper area will
lower thermal resistance further.
Typical Performance Characteristics
Switch Current Limit
DS100050-2
Minimum Operating
Supply Voltage
DS100050-3
Switching Frequency
DS100050-4
Quiescent Current
DS100050-5
Standby
Quiescent Current
DS100050-6
Feedback Pin
Bias Current
DS100050-7
3
www.national.com
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