LM2641MTC-ADJ Datasheet, PDF (5/31 Pages) Texas Instruments – LM2641 Dual Adjustable Step-Down Switching Power Supply Controller

LM2641
www.ti.com
SNVS040B – JANUARY 2000 – REVISED APRIL 2013
Absolute Maximum Ratings^(1)(2)(3)
IN, SW1, and SW2
FB1 and FB2
SD, ON/OFF1, ON/OFF2,
2NDFB/FPWM, SYNC, REF,
SS1, SS2, COMP1,
COMP2 and CSL1
LIN
CSH1, CSH2, and CSL2 ⁽⁴⁾
Voltage from CBOOT1 to SW1
and from CBOOT2 to SW2
Voltage from HDRV1 to SW1
and from HDRV2 to SW2
Voltage from CBOOT1 to HDRV1
and from CBOOT2 to HDRV2
Junction Temp.
Power Dissipation ⁽⁵⁾
Ambient Storage Temp. (T_J)
Soldering Dwell Time, Temp. ⁽⁶⁾
Wave
Infrared
ESD Rating ⁽⁷⁾
Vapor Phase
−0.3 to 31V
−0.3 to 3V
−0.3 to (V_LIN +0.3)V
−0.3 to 6V
−0.3 to 9V
−0.3 to 5V
−0.3V
−0.3V
+150°C
883 mW
−65 to +150°C
4 sec, 260°C
10 sec, 240°C
75 sec, 219°C
2 kV
(1) Unless otherwise specified, all voltages are with respect to the voltage at the GND and PGND pins.
(2) 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.
(3) If Military/Aerospace specified devices are required, please contact the TI Sales Office/ Distributors for availability and specifications.
(4) In applications where the output voltage can exceed the absolute maximum rating, a 100Ω resistor must be placed in series with the
CSH and CSL inputs.
(5) The Absolute Maximum power dissipation depends on the ambient temperature. The 883 mW rating results from substituting 150°C,
70°C, and 90.6°C/W for T_Jmax, T_A, and θ_JA respectively into the formula P_max = (T_Jmax - T_A)/θ_JA, where P_max is the Absolute Maximum
power dissipation, T_Jmax is the Absolute Maximum junction temperature, T_A is the ambient temperature, and θ_JA is the junction-to-
ambient thermal resistance of the package. A θ_JA of 90.6°C/W represents the worst-case condition of no heat sinking of the 28-pin
TSSOP. Heat sinking allows the safe dissipation of more power. The Absolute Maximum power dissipation must be derated by 11.04
mW per °C above 70°C ambient. The LM2641 actively limits its junction temperature to about 150°C.
(6) For detailed information on soldering plastic small-outline packages, refer to (SNOA549) available from TI.
(7) For testing purposes, ESD was applied using the human-body model, a 100 pF capacitor discharged through a 1.5 kΩ resistor.
Operating Ratings ⁽¹⁾⁽²⁾
V_IN
Junction Temp. (T_J)
5.5 to 30V
0 to +125°C
(1) Unless otherwise specified, all voltages are with respect to the voltage at the GND and PGND pins.
(2) 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.
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