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LM3281 Datasheet(PDF) 11 Page - Texas Instruments

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Part # LM3281
Description  3.3-V, 1.2-A, 6-MHz Miniature Step-Down DC-DC Converter
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LM3281 Datasheet(HTML) 11 Page - Texas Instruments

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LM3281
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SNVSA38 – NOVEMBER 2014
Feature Description (continued)
7.3.3 Low IQ
An ECOnomy (ECO) mode of operation draws 16 µA (typ.) quiescent current, permitting the LM3281 to be used
in “always-on” applications. This low IQ is achieved over the entire input supply range of 5.5 V to 2.6 V,
irrespective of whether LM3281 is operating in regulation (ECO Mode or Analog Bypass mode) or in full dropout
(full bypass).
7.3.4 Forced PWM Operation
ECO mode provides low IQ while PWM mode optimizes output voltage ripple and transient performance. When
high, the MODE pin permits automatic mode selection based on load current. When MODE is pulled low the
LM3281 enters “forced PWM” operation with very low ripple and optimized transient response. Alternately, the
MODE pin can be tied high in an application to allow the device to always select a mode of operation
automatically.
7.3.5 High Maximum Current
Load current of 1.2 A is supported with short bursts (of < 100 µS with < 10% duty cycle) up to 1.4 A.
A wide variety of load current use cases are accommodated by the LM3281. Examples are described in Table 1
and Table 2: one for high ambient temperature all the time, and one for a more typical ambient temperature use
case. Many alternate use case scenarios are available; please contact TI to discuss the load current relevant for
a given application.
For the high ambient temperature of 85°C for the entire device operational lifetime, see Table 1:
Table 1. ILOAD Example for Constant 85°C Ambient Temperature
ILOAD
AMBIENT TEMPERATURE
PERCENT OPERATIONAL LIFETIME
100 mA
85°C
Up to 100%
700 mA
85°C
Up to 60%
1400 mA
85°C
Up to 3%
For a more typical ambient temperature distribution of TA ≤ 70°C for ≥ 80% of the operational lifetime and 70°C <
TA ≤ 85% for ≤ 20% of the operational lifetime, see Table 2:
Table 2. ILOAD Example for a More Typical Ambient Temperature Use
ILOAD
AMBIENT TEMPERATURE
PERCENT OPERATIONAL LIFETIME
100 mA
70°C < TA ≤ 85°C for ≤ 20% of time
Up to 100%
TA ≤ 70°C for ≥ 80% of time
850 mA
70°C < TA ≤ 85°C for ≤ 20% of time
Up to 60%
TA ≤ 70°C for ≥ 80% of time
1400 mA
70°C < TA ≤ 85°C for ≤ 20% of time
Up to 3%
TA ≤ 70°C for ≥ 80% of time
7.3.6 High-Capacitance Load and Line Transient Performance
The LM3281 is internally compensated to drive loads with large bypass capacitance, including transceiver
modules, without sacrificing transient performance. Please reference Total Effective Output Capacitance (COUT +
CLOAD1 + CLOAD2) regarding output capacitance requirements.
7.3.7 Soft Start
During start-up a soft-start feature prevents high input current which could cause supply voltage bus drops and
interfere with other subsystems sharing the supply bus. Soft start is especially valuable in applications where
large load capacitance must be charged on start-up. Loading of the output during start-up condition will extend
the soft-start time. Excessive loading may even prevent the output from reaching the target voltage, and the
device may therefore stay in the soft-start condition indefinitely.
Copyright © 2014, Texas Instruments Incorporated
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