SNVS582O September 2008 – August 2015 LM22677 , LM22677-Q1
PRODUCTION DATA.
- 1 Features
- 2 Applications
- 3 Description
- 4 Revision History
- 5 Pin Configuration and Functions
- 6 Specifications
- 7 Detailed Description
- 8 Applications and Implementation
- 9 Power Supply Recommendations
- 10Layout
- 11Device and Documentation Support
- 12Mechanical, Packaging, and Orderable Information
Package Options
Mechanical Data (Package|Pins)
- NDR|7
Thermal pad, mechanical data (Package|Pins)
Orderable Information
1 Features
- Wide Input Voltage Range: 4.5 V to 42 V
- Internally Compensated Voltage Mode Control
- Stable With Low ESR Ceramic Capacitors
- 100-mΩ N-Channel MOSFET
- Output Voltage Options:
- -ADJ (Outputs as Low as 1.285 V)
- -5.0 (Output Fixed to 5 V)
- ±1.5% Feedback Reference Accuracy
- 500-kHz Default Switching Frequency
- Adjustable Switching Frequency and Synchronization
- –40°C to +125°C Operating Junction Temperature Range
- Precision Enable Input
- Integrated Boot-Strap Diode
- Integrated Soft-Start
- Fully WEBENCH® Enabled
- LM22677-Q1 is an Automotive-Grade Product
that is AEC-Q100 Grade 1 Qualified (–40°C to +125°C Operating Junction Temperature) - NDR (Exposed Pad)
2 Applications
- Industrial Control
- Telecom and Datacom Systems
- Embedded Systems
- Conversions from Standard 24-V, 12-V and 5-V Input Rails
Simplified Application Schematic
3 Description
The LM22677 switching regulator provides all of the functions necessary to implement an efficient high-voltage step-down (buck) regulator using a minimum of external components. This easy-to-use regulator incorporates a 42-V N-channel MOSFET switch that can provide up to 5 A of load current. Excellent line and load regulation along with high efficiency (> 90%) are featured. Voltage mode control offers short minimum on-time, allowing the widest ratio between input and output voltages. Internal loop compensation means that the user is free from the tedious task of calculating the loop compensation components. Fixed 5-V output and adjustable output voltage options are available. The default switching frequency is set at 500 kHz, thus allowing for small external components and good transient response. In addition, the frequency can be adjusted over a range of 200 kHz to 1 MHz with a single external resistor. The internal oscillator can be synchronized to a system clock or to the oscillator of another regulator. A precision enable input allows simplification of regulator control and system power sequencing. In shutdown mode the regulator draws only 25 µA (typical). The LM22677 also has built-in thermal shutdown, and current limiting to protect against accidental overloads.
The LM22677 device is a member of Texas Instruments' SIMPLE SWITCHER® family. The SIMPLE SWITCHER concept provides for an easy-to-use complete design using a minimum number of external components and the TI WEBENCH design tool. TI's WEBENCH tool includes features such as external component calculation, electrical simulation, thermal simulation, and Build-It boards for easy design-in.
Device Information(1)
| PART NUMBER | PACKAGE | BODY SIZE (NOM) |
|---|---|---|
| LM22677 | TO-263 (7) | 10.16 mm x 9.85 mm |
| LM22677-Q1 |
- For all available packages, see the orderable addendum at the end of the data sheet.
4 Revision History
Changes from N Revision (November 2014) to O Revision
- Changed the word Pin to InputGo
- Changed the Q grade part number corrected to LM22677 from LM2677'; added icon for Reference Design to top navsGo
- Changed "PFM" Package to "NDR" Package Go
Changes from M Revision (April 2013) to N Revision
- Added Pin Configuration and Functions section, Handling Rating table, Feature Description section, Device Functional Modes, Application and Implementation section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and Mechanical, Packaging, and Orderable Information section Go
- Deleted Inverting Regulator ApplicationGo