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LM2641MTCX-ADJ bảng dữ liệu(PDF) 6 Page - Texas Instruments

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Giải thích chi tiết về linh kiện  LM2641 Dual Adjustable Step-Down Switching Power Supply Controller
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LM2641
SNVS040B – JANUARY 2000 – REVISED APRIL 2013
www.ti.com
Electrical Characteristics
Typicals and limits appearing in regular type apply for TJ = 25°C. Limits appearing in boldface type apply over the entire
junction temperature range for operation, 0 to +125°C. Unless otherwise specified under the Parameter or Conditions
columns, VIN = 10V, and VSD = VON/OFF1 = VON/OFF2 = 5V.
(1) (2) (3)
Symbol
Parameter
Conditions
Typical
Limit
Units
System
VIN
Input Supply Voltage Range
5.5
V(min)
30
V(max)
VOUT1
Output Voltage Adjustment
2.2
V(min)
Range
6.0
V(max)
VOUT2
Output Voltage Adjustment
2.2
V(min)
Range
8.0
V(max)
ΔVOUT/VOUT
Load Regulation
0 mV
≤ (CSH1-CSL1) ≤ 80 mV,
0.5
%
0 mV
≤ (CSH2-CSL2) ≤ 80 mV
ΔVOUT/ΔVIN
Line Regulation
5.5V
≤ VIN ≤ 30V
0.002
%/V
IIN
Input Supply Current
ON (4)
0.6
mA
VFB1 = VFB2 = 1.4V,
1
mA(max)
VCSH1 = 5.2V, VCSL1 = 5V,
VCSH2 = 3.5V, VCSL2 = 3.3V
Standing By (5)
80
µA
VON/OFF1 = VON/OFF2 = 0V
150
µA(max)
Shut Down (6)
25
µA
VSD = 0V
60
µA(max)
ISS1, ISS2
Soft-Start Source Current
VSS1 = VSS2 = 1V
4.75
µA
2.0
µA(min)
7.0
µA(max)
Soft-Start Sink Current
10
µA
VPCL
Positive Current Limit Voltage
100
mV
(Voltage from CSH1 to CSL1
80
mV(min)
and from CSH2 to CSL2)
140
mV(max)
VNCL
Negative Current Limit Voltage
V2NDFB/FPWM = 0.8V
−100
mV
(Voltage from CSH1 to CSL1
−80
mV(min)
and from CSH2 to CSL2)
−140
mV(max)
VOUT Undervoltage Shutdown
70
%
Latch Threshold
60
%(min)
80
%(max)
VOUT Overvoltage Shutdown
150
%
Latch Threshold
135
%(min)
165
%(max)
(1)
Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which
operation of the device is specified. Operating Ratings do not imply specified performance limits. For specified performance limits and
associated test conditions, see the Electrical Characteristics tables.
(2)
A typical is the center of characterization data taken with TA = TJ = 25°C. Typicals are not specified.
(3)
All limits are specified. All electrical characteristics having room-temperature limits are tested during production with TA = 25°C. All hot
and cold limits are specified by correlating the electrical characteristics to process and temperature variations and applying statistical
process control.
(4)
Both controllers are ON but not switching. Currents entering the IC at IN, CSL1, CSH1, CSL2, and CSH2 are measured. Those entering
at CSL1 and CSH1 are multiplied by 0.50 to emulate the effect of a switching conversion from 10V down to 5V. Those entering at CSL2
and CSH2 are multiplied by 0.33 to emulate the effect of a switching conversion from 10V down to 3.3V. After multiplication, all five
currents are added. Because the voltage at the CSL1 input is greater than the LIN-to-VOUT switchover threshold, most of the input
supply current enters the IC via the CSL1 input.
(5)
Both switching controllers are OFF. The 5V, 50 mA linear regulator (output at LIN) and the precision 2.5V reference (output at REF)
remain ON.
(6)
Both switching controllers and the 2.5V precision reference are OFF. The 5V, 50 mA linear regulator remains ON.
6
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Product Folder Links: LM2641


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