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LM2619 Fiches technique(PDF) 11 Page - Texas Instruments

No de pièce LM2619
Description  500-mA Sub-Miniature Step-Down DC-DC Converter
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
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LM2619 Fiches technique(HTML) 11 Page - Texas Instruments

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20 ?s/ DIV
50 mV/DIV
AC Coupled
300 mA
100 mA
I
OUT
VOUT
VIN = 3.6V
VOUT = 1.5V
SYNC = V
IN
20 Ps/DIV
20 mV/DIV
AC Coupled
4.0V
3.0V
VIN
VOUT
VOUT = 1.5V
VIN = 3.0V to 4.0V, tr = tf = 10 Ps
IOUT = 100 mA
SYNC = VIN
LM2619
www.ti.com
SNVS212B – NOVEMBER 2002 – REVISED MAY 2013
DROPOUT CONSIDERATIONS
The LM2619 can be used to provide fixed output voltages by using external feedback resistors. The output
voltage can be set from 1.5V to 3.6V. The internal reference voltage for the error amplifier is 1.5V. In cases
where the output voltage is set higher than 2.5V, the part will go into dropout or 100% duty cycle when the input
voltage gets close to the set output voltage. Near dropout the on time of the P-FET may exceed one PWM clock
cycle and cause higher ripple on the output for load currents greater than 450mA. This increased ripple will exist
for a narrow range of input voltages close to the 100% duty cycle and once the input voltage goes down further
the P-FET will be fully on. See SETTING THE OUTPUT VOLTAGE in Application Information for further details.
In dropout conditions the output voltage is VIN − IOUT (Rdc + RDSON (P)) where Rdc is the series resistance of the
inductor and RDSON (P) is the on resistance of the PFET.
Load Transient Response
Line Transient Response
(Circuit in Figure 3)
(Circuit in Figure 3)
Figure 24.
Figure 25.
SOFT-START
The LM2619 has soft start to reduce current inrush during power-up and startup. This reduces stress on the
LM2619 and external components. It also reduces startup transients on the power source. Soft start is
implemented by ramping up the reference input to the error amplifier of the LM2619 to gradually increase the
output voltage.
THERMAL SHUTDOWN PROTECTION
The LM2619 has a thermal shutdown protection function to protect itself from short-term misuse and overload
conditions. When the junction temperature exceeds 150°C the device turns off the output stage and when the
temperature drops below 130°C it initiates a soft start cycle. Prolonged operation in thermal shutdown conditions
may damage the device and is considered bad practice.
Copyright © 2002–2013, Texas Instruments Incorporated
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