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LM2619 Folha de dados(PDF) 7 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Nome de Peças LM2619
Descrição Electrónicos  500mA Sub-Miniature Step-Down DC-DC Converter
Download  15 Pages
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Fabricante Electrônico  NSC [National Semiconductor (TI)]
Página de início  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM2619 Folha de dados(HTML) 7 Page - National Semiconductor (TI)

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Typical Performance Characteristics LM2619ATL, Circuit of Figure 3,V
IN = 3.6V, TA = 25˚C, unless
otherwise noted. (Continued)
Efficiency vs Output Current
(V
OUT = 1.5V, PWM MODE)
Efficiency vs Output Current
(V
OUT = 1.5V, PWM MODE, with Diode)
20057415
20057416
Efficiency vs Output Current
(V
OUT = 3.6V, PWM MODE)
(Circuit in Figure 4)
Efficiency vs Output Current
(V
OUT = 3.6V, PWM MODE, with Diode)
(Circuit in Figure 4)
20057417
20057418
Device Information
The LM2619 is a simple, step-down DC-DC converter opti-
mized for powering circuits in mobile phones, portable com-
municators, and similar battery powered RF devices. It is
based on a current-mode buck architecture, with synchro-
nous rectification in PWM mode for high efficiency. It is
designed for a maximum load capability of 500mA in PWM
mode. Maximum load range may vary from this depending
on input voltage, output voltage and the inductor chosen.
The device has all three of the pin-selectable operating
modes required for powering circuits in mobile phones and
other sophisticated portable devices with complex power
management needs. Fixed-frequency PWM operation offers
full output current capability at high efficiency while minimiz-
ing interference with sensitive IF and data acquisition cir-
cuits. During standby operation, hysteretic PFM mode re-
duces quiescent current to 160µA typ. to maximize battery
life. Shutdown mode turns the device off and reduces battery
consumption to 0.02µA (typ).
DC PWM mode feedback voltage precision is ±1%. Effi-
ciency is typically 96% for a 200mA load with 3.6V output,
3.9V input. The efficiency can be further increased by using
a schottky diode like MBRM120L as shown in Figure 4. PWM
mode quiescent current is 600µA typ. The output voltage can
be set from 1.5V to 3.6V by using external feedback resis-
tors.
Additional features include soft-start, current overload pro-
tection, over voltage protection and thermal shutdown pro-
tection.
The LM2619 is constructed using a chip-scale 10-pin thin
micro SMD package. This package offers the smallest pos-
sible size, for space-critical applications such as cell phones,
where board area is an important design consideration. Use
of a high switching frequency (600kHz) reduces the size of
www.national.com
7


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