LM2641MTC-ADJ Datasheet, PDF (6/31 Pages) Texas Instruments – LM2641 Dual Adjustable Step-Down Switching Power Supply Controller

LM2641
SNVS040B – JANUARY 2000 – REVISED APRIL 2013
www.ti.com
Electrical Characteristics
Typicals and limits appearing in regular type apply for T_J = 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, V_IN = 10V, and V_SD = V_ON/OFF1 = V_ON/OFF2 = 5V. ^(1)(2)(3)
Symbol
Parameter
Conditions
Typical
Limit
Units
System
V_IN
Input Supply Voltage Range
5.5
V(min)
30
V(max)
V_OUT1
Output Voltage Adjustment
Range
2.2
V(min)
6.0
V(max)
V_OUT2
Output Voltage Adjustment
Range
2.2
V(min)
8.0
V(max)
ΔV_OUT/V_OUT
Load Regulation
0 mV ≤ (CSH1-CSL1) ≤ 80 mV,
0.5
%
0 mV ≤ (CSH2-CSL2) ≤ 80 mV
ΔV_OUT/ΔV_IN
I_IN
Line Regulation
Input Supply Current
5.5V ≤ V_IN ≤ 30V
ON ⁽⁴⁾
V_FB1 = V_FB2 = 1.4V,
V_CSH1 = 5.2V, V_CSL1 = 5V,
V_CSH2 = 3.5V, V_CSL2 = 3.3V
Standing By ⁽⁵⁾
0.002
0.6
80
%/V
mA
1
mA(max)
µA
V_ON/OFF1 = V_ON/OFF2 = 0V
Shut Down ⁽⁶⁾
150
µA(max)
25
µA
I_SS1, I_SS2
Soft-Start Source Current
V_SD = 0V
V_SS1 = V_SS2 = 1V
60
µA(max)
4.75
µA
2.0
µA(min)
7.0
µA(max)
Soft-Start Sink Current
10
µA
V_PCL
Positive Current Limit Voltage
(Voltage from CSH1 to CSL1
and from CSH2 to CSL2)
100
mV
80
mV(min)
140
mV(max)
V_NCL
Negative Current Limit Voltage
(Voltage from CSH1 to CSL1
and from CSH2 to CSL2)
V_2NDFB/FPWM = 0.8V
−100
−80
−140
mV
mV(min)
mV(max)
V_OUT Undervoltage Shutdown
Latch Threshold
70
%
60
%(min)
80
%(max)
V_OUT Overvoltage Shutdown
Latch Threshold
150
%
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 T_A = T_J = 25°C. Typicals are not specified.
(3) All limits are specified. All electrical characteristics having room-temperature limits are tested during production with T_A = 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-V_OUT 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.
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