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LM2831 Datasheet(PDF) 1 Page - Texas Instruments

Part # LM2831
Description  LM2831 High-Frequency 1.5-A Load ??Step-Down DC-DC Regulator
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

LM2831 Datasheet(HTML) 1 Page - Texas Instruments

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0.1
1
LOAD (A)
"X"
GND
FB
EN
VIN
SW
VIN = 5V
C1
R3
D1
L1
R2
R1
C2
C3
VO = 3.3V @ 1.5A
LM2831
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Design
LM2831
SNVS422D – AUGUST 2006 – REVISED SEPTEMBER 2015
LM2831 High-Frequency 1.5-A Load — Step-Down DC-DC Regulator
1 Features
3 Description
The
LM2831
regulator
is
a
monolithic,
high-
1
Space-Saving SOT-23 Package
frequency, PWM step-down DC-DC converter in a 5-
Input Voltage Range of 3 V to 5.5 V
pin SOT-23 and a 6-Pin WSON package. The
Output Voltage Range of 0.6 V to 4.5 V
LM2831 provides all the active functions to provide
local DC-DC conversion with fast transient response
1.5-A Output Current
and accurate regulation in the smallest possible PCB
High Switching Frequencie
area. With a minimum of external components, the
1.6 MHz (LM2831X)
LM2831 is easy to use. The ability to drive 1.5-A
loads with an internal 130-m
Ω PMOS switch using
0.55 MHz (LM2831Y)
state-of-the-art 0.5-µm BiCMOS technology results in
3 MHz (LM2831Z)
the best power density available. The world-class
130-m
Ω PMOS Switch
control circuitry allows on-times as low as 30 ns, thus
0.6-V, 2% Internal Voltage Reference
supporting exceptionally high frequency conversion
over the entire 3 V to 5.5 V input operating range,
Internal Soft Start
down to the minimum output voltage of 0.6 V.
Current Mode, PWM Operation
Switching frequency is internally set to 550 kHz, 1.6
Thermal Shutdown
MHz, or 3 MHz, allowing the use of extremely small
surface mount inductors and chip capacitors. Even
Overvoltage Protection
though the operating frequency is high, efficiencies of
up to 93% are easy to achieve. External shutdown is
2 Applications
included, featuring an ultra-low standby current of 30
Local 5 V to Vcore Step-Down Converters
nA. The LM2831 utilizes current-mode control and
internal compensation to provide high-performance
Core Power in HDDs
regulation over a wide range of operating conditions.
Set-Top Boxes
Additional features include internal soft-start circuitry
USB Powered Devices
to reduce inrush current, pulse-by-pulse current limit,
DSL Modems
thermal shutdown, and output overvoltage protection.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
WSON (6)
3.00 mm × 3.00 mm
LM2831
SOT-23 (5)
1.60 mm × 2.90 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Typical Application Circuit
Efficiency vs Load
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.


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