DC/DC Converter. LM2650 Datasheet

LM2650 Converter. Datasheet pdf. Equivalent


Part LM2650
Description Synchronous Step-Down DC/DC Converter
Feature LM2650 www.ti.com SNVS133C – JUNE 1999 – REVISED APRIL 2013 LM2650 Synchronous Step-Down DC/DC Co.
Manufacture etcTI
Datasheet
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LM2650 Synchronous Step-Down DC/DC Converter June 1999 LM2 LM2650 Datasheet
LM2650 www.ti.com SNVS133C – JUNE 1999 – REVISED APRIL 201 LM2650 Datasheet
Recommendation Recommendation Datasheet LM2650 Datasheet




LM2650
LM2650
www.ti.com
SNVS133C – JUNE 1999 – REVISED APRIL 2013
LM2650 Synchronous Step-Down DC/DC Converter
Check for Samples: LM2650
FEATURES
1
2 Ultra High Efficiencies (95% possible)
• High Efficiency Over a 3A to Milliamperes
Load Range
• Synchronous Switching of Internal NMOS
Power FETs
• Wide Input Voltage Range (4.5V to 18V)
• Output Voltage Adjustable from 1.5V to 16V
• Automatic Low-Power Sleep Mode
• Logic-Controlled Micropower Shutdown (IQSD
25 µA)
• Frequency Adjustable up to 300 kHz
• Frequency Synchronization with External
Signal
• Programmable Soft-Start
• Short-Circuit Current Limiting
• Thermal Shutdown
• Available in 24-lead Small-Outline Package
APPLICATIONS
• Notebook and Palmtop Personal Computers
• Portable Data Terminals
• Modems
• Portable Instruments
• Global Positioning Devices (GPSs)
• Battery-Powered Digital Devices
DESCRIPTION
The LM2650 is a step-down DC/DC converter
featuring high efficiency over a 3A to milliamperes
load range. This feature makes the LM2650 an ideal
fit in battery-powered applications that demand long
battery life in both run and standby modes.
The LM2650 also features a logic-controlled
shutdown mode in which it draws at most 25μA from
the input power supply.
The LM2650 employs a fixed-frequency pulse-width
modulation (PWM) and synchronous rectification to
achieve very high efficiencies. In many applications,
efficiencies reach 95%+ for loads around 1A and
exceed 90% for moderate to heavy loads from 0.2A
to 2A.
A low-power hysteretic or "sleep" mode keeps
efficiencies high at light loads. The LM2650 enters
and exits sleep mode automatically as the load
crosses "sleep in" and "sleep out" thresholds. The
LM2650 provides nodes for programming both
thresholds via external resistors. A logic input allows
the user to override the automatic sleep feature and
keep the LM2650 in PWM mode regardless of the
load level.
An optional soft-start feature limits current surges
from the input power supply at start up and provides
a simple means of sequencing multiple power
supplies.
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 1999–2013, Texas Instruments Incorporated



LM2650
LM2650
SNVS133C – JUNE 1999 – REVISED APRIL 2013
Typical Application
www.ti.com
Figure 1. Converting a Four-Cell Li Ion Battery to 5V
LM2650-ADJ Efficiency
Connection Diagram
Figure 2.
Figure 3. Top View
24-Lead Small Outline Package (DW)
See Package Number DW0024B
2 Submit Documentation Feedback
Product Folder Links: LM2650
Copyright © 1999–2013, Texas Instruments Incorporated







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