LM2619ATLX National Semiconductor, LM2619ATLX Datasheet - Page 7

• Manufacturer Part Number: LM2619ATLX
• Description: Conv DC-DC Single Step Down 2.8V to 5.5V 10-Pin uSMD T/R
• Manufacturer: National Semiconductor
• Type: Step Downr

Specifications of LM2619ATLX

• Package: 10uSMD
• Number Of Outputs: 1
• Minimum Input Voltage: 2.8 V
• Maximum Input Voltage: 5.5 V
• Switching Frequency: 500 to 1000 KHz
• Operating Supply Voltage: 2.8 to 5.5 V
• Maximum Output Current: 0.5 A
• Output Type: Adjustable
• Output Voltage: 1.5 to 3.6 V
• Switching Regulator: Yes
• Efficiency: 96(Typ) %
• Operating Temperature: -25 to 125 °C

Typical Performance Characteristics
otherwise noted. (Continued)
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-
Efficiency vs Output Current
Efficiency vs Output Current
(V
(V
OUT
OUT
(Circuit in Figure 4)
= 1.5V, PWM MODE)
= 3.6V, PWM MODE)
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LM2619ATL, Circuit of Figure 3, V
7
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
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
(V
(V
OUT
OUT
Efficiency vs Output Current
Efficiency vs Output Current
= 1.5V, PWM MODE, with Diode)
= 3.6V, PWM MODE, with Diode)
(Circuit in Figure 4)
IN
= 3.6V, T
A
= 25˚C, unless
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±
1%. Effi-