LM2735_15 Datasheet, PDF (1/59 Pages) Texas Instruments – LM2735-xx 520-kHz and 1.6-MHz Space-Efficient Boost and SEPIC DC-DC Regulator

Product
Folder
Sample &
Buy
Technical
Documents
Tools &
Software
Support &
Community
LM2735, LM2735-Q1
SNVS485G – JUNE 2007 – REVISED AUGUST 2015
LM2735-xx 520-kHz and 1.6-MHz Space-Efficient Boost and SEPIC DC-DC Regulator
1 Features
•1 Input Voltage Range: 2.7 V to 5.5 V
• Output Voltage Range: 3 V to 24 V
• 2.1-A Switch Current Over Full Temperature
Range
• Current-Mode Control
• Logic High Enable Pin
• Ultra-Low Standby Current of 80 nA in Shutdown
• 170-mΩ NMOS Switch
• ±2% Feedback Voltage Accuracy
• Ease-of-Use, Small Total Solution Size
– Internal Soft Start
– Internal Compensation
– Two Switching Frequencies
– 520 kHz (LM2735-Y)
– 1.6 MHz (LM2735-X)
– Uses Small Surface Mount Inductors and Chip
Capacitors
– Tiny SOT-23, WSON, and MSOP-PowerPAD
Packages
• LM2735-Q1 is AEC-Q100 Grade 1 Qualified and
is Manufactured on an Automotive Grade Flow
2 Applications
• LCD Display Backlighting For Portable
Applications
• OLED Panel Power Supply
• USB-Powered Devices
• Digital Still and Video Cameras
• White LED Current Source
• Automotive
space
Typical Boost Application Circuit
V_IN
2.7V-5.5V
12V
L₁
D₁
3 Description
The LM2735 device is an easy-to-use, space-efficient
2.1-A low-side switch regulator, ideal for Boost and
SEPIC DC-DC regulation. The device provides all the
active functions to provide local DC-DC conversion
with fast-transient response and accurate regulation
in the smallest PCB area. Switching frequency is
internally set to either 520 kHz or 1.6 MHz, allowing
the use of extremely small surface mount inductor
and chip capacitors, while providing efficiencies of up
to 90%. Current-mode control and internal
compensation provide ease-of-use, minimal
component count, and high-performance regulation
over a wide range of operating conditions. External
shutdown features an ultra-low standby current of 80
nA, ideal for portable applications. Tiny SOT-23,
WSON, and MSOP-PowerPAD packages provide
space savings. Additional features include internal
soft start, circuitry to reduce inrush current, pulse-by-
pulse current limit, and thermal shutdown.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
WSON (6)
3.00 mm × 3.00 mm
LM2735
SOT-23 (5)
1.60 mm × 2.90 mm
MSOP-PowerPAD (8) 3.00 mm × 3.00 mm
LM2735-Q1
WSON (6)
SOT-23 (5)
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 V_O = 12 V
R₃
4
3
2
5
1
R₂
C₃
C₂
R₁
C₁
GND
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.