LM2734Z_16 Datasheet, PDF (1/36 Pages) Texas Instruments – Thin SOT 1-A Load Step-Down DC-DC Regulator

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LM2734Z, LM2734Z-Q1
SNVS334F – JANUARY 2005 – REVISED JANUARY 2016
LM2734Z/-Q1 Thin SOT 1-A Load Step-Down DC-DC Regulator
1 Features
•1 Qualified for Automotive Applications
• AEC-Q100 Qualified With the Following Results:
– Device Temperature Grade 1: –40°C to 125°C
Ambient Operating Temperature Range
– Device HBM ESD Classification Level 2
– Device CDM ESD Classification Level C6
• 6-pin SOT Package, or 6-Pin WSON Package
• 3.0-V to 20-V Input Voltage Range
• 0.8-V to 18-V Output Voltage Range
• 1-A Output Current
• 3-MHz Switching Frequency
• 300-mΩ NMOS Switch
• 30-nA Shutdown Current
• 0.8-V, 2% Internal Voltage Reference
• Internal Soft-Start
• Current-Mode, PWM Operation
• Thermal Shutdown
2 Applications
• DSL Modems
• Local Point of Load Regulation
• Battery-Powered Devices
• USB-Powered Devices
• Automotive
Typical Application Circuit
3 Description
The LM2734Z regulator is a monolithic, high-
frequency, PWM step-down DC–DC converter
assembled in a thick 6-pin SOT and a WSON non-
pullback package. The device provides all the active
functions to provide local DC–DC conversion with fast
transient response and accurate regulation in the
smallest possible PCB area.
With a minimum of external components and online
design support through WEBENCH™, the LM2734Z
is easy to use. The ability to drive 1-A loads with an
internal 300-mΩ NMOS switch using state-of-the-art
0.5-µm BiCMOS technology results in the best power
density available. The world class control circuitry
allows for ON-times as low as 13 ns, thus supporting
exceptionally high-frequency conversion over the
entire 3-V to 20-V input operating range down to the
minimum output voltage of 0.8 V. Switching frequency
is internally set to 3 MHz, allowing the use of
extremely small surface mount inductors and chip
capacitors. Even though the operating frequency is
very high, efficiencies up to 85% are easy to achieve.
External shutdown is included, featuring an ultra-low
standby current of 30 nA. The LM2734Z uses current-
mode control and internal compensation to provide
high-performance regulation over a wide range of
operating conditions. Additional features include
internal soft-start circuitry to reduce inrush current,
pulse-by-pulse current limit, thermal shutdown, and
output overvoltage protection.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LM2734Z
WSON (6)
SOT (6)
3.00 mm × 3.00 mm
1.60 mm × 2.90 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Efficiency vs Load Current
VIN
C1
ON
OFF
D2
VIN
BOOST
C3
SW
LM2734
D1
EN
FB
GND
L1
VOUT
C2
R1
R2
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.