LM2641MTC-ADJ Datasheet, PDF (8/31 Pages) Texas Instruments – LM2641 Dual Adjustable Step-Down Switching Power Supply Controller

LM2641
SNVS040B – JANUARY 2000 – REVISED APRIL 2013
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Electrical Characteristics (continued)
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
V_UVLO
Undervoltage Lockout Threshold See ⁽⁷⁾
4.0
V
3.6
V(min)
4.4
V(max)
LIN-to-V_OUT Switch-Over
V_OUT taken at CSL1
4.8
V
Threshold
Logic Inputs
V_IH
Minimum High Level Input
Voltage (SD, ON/OFF1,
ON/OFF2, and SYNC)
2.4
V(min)
Minimum High Level Input
Voltage (2NDFB/FPWM)
2.6
V(min)
V_IL
Maximum Low Level Input
Voltage (SD, ON/OFF1,
ON/OFF2, SYNC, and
2NDFB/FPWM)
0.8
V(max)
Maximum Input Leakage Current Logic Input Voltage 0 or 5V
±0.1
µA
(SD, ON/OFF1, ON/OFF2, and
SYNC)
(7) The controllers remain OFF until the voltage of the 5V, 50 mA linear regulator (output at LIN) reaches this threshold.
8
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