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LM2650

Features: ` 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 micropowe...

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SeekIC No. : 004394950 Detail

LM2650: Features: ` 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)` O...

LM2650 Data Sheet

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Part Number:
LM2650
Supply Ability:
5000

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  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Product Details

Description



Features:

` 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 A)
` 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




Application

·Notebook and palmtop personal computers
· Portable data terminals
· Modems
· Portable Instruments
· Global positioning devices (GPSs)
· Battery-powered digital devices




Pinout

Connection Diagram




Specifications

If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
(All voltages are referenced to the PGND and GND pins.)
DC Voltage at PVIN and VIN ....................................20V
DC Voltage at SD, SLEEP LOGIC
and SYNC .................................................................15V
DC current into SW.............................................. ±7.5A
Junction Temperature ..........................Limited by the IC
DC Power Dissipation (Note 2)............................. 1.28W
Storage Temperature....................... −65°C to +150°C
Soldering Time, Temperature (Note 3)
Wave (4 seconds)................................................260°C
Infrared (10 seconds)..........................................240°C
Vapor Phase (75 seconds)...................................219°C
ESD Susceptibility (Note 4) ...................................1.3 kV

Output Current 3000 mA
Input Min Voltage 4.5 Volt
Input Max Voltage 18 Volt
Output Min 1.5 Volt
Output Max 16 Volt
Frequency Min 90 kHz
Frequency Max 300 kHz
Efficiency (peak) 95 %
On/Off Pin Yes
Error Flag No
SoftStart Yes
Sync Pin Yes
Inverting No
Flyback No
RegType Switching Regulator
Temperature Min -40 deg C
Temperature Max 125 deg C
Adjustable Output Yes
Adj Switch Frequency Yes
PWM Mode Current
Topology Synchronous Buck
Special Features Max. Iq at shutdown is 25uA over full temp. range
Step-Down Yes
Multiple Output Capability No
Output Power Undefined Watt
Output Range 1.5V to16V
Switching Frequency 90 kHz
Feedback Voltage Undefined Volt
Regulator Family Undefined
Synchronous Rectification Yes
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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 25A 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.






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