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LM2640

Features: ·200 kHz fixed-frequency switching·Switching synchronization with an external signal up to 400 kHz·Optional pulse-skipping mode·Adjustable secondary feedback·Input undervoltage lockout·Output undervoltage shutdown protection·Output overvoltage shutdown protection·Programmable soft-start ...

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SeekIC No. : 004394943 Detail

LM2640: Features: ·200 kHz fixed-frequency switching·Switching synchronization with an external signal up to 400 kHz·Optional pulse-skipping mode·Adjustable secondary feedback·Input undervoltage lockout·Out...

LM2640 Data Sheet

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Part Number:
LM2640
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:

·200 kHz fixed-frequency switching
·Switching synchronization with an external signal up to 400 kHz
·Optional pulse-skipping mode
·Adjustable secondary feedback
·Input undervoltage lockout
·Output undervoltage shutdown protection
·Output overvoltage shutdown protection
·Programmable soft-start (each controller)
·5V, 50 mA linear regulator output
·Precision 2.5V reference output
·28-pin TSSOP




Application

·Notebook and subnotebook computers
·Wireless data terminals
·Battery-powered instruments




Pinout

Connection Diagram




Specifications

If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
IN, SW1, and SW2 ......................................−0.3 to 31V
FB1 and FB2 ..................................................−0.3 to 3V
SD, ON/OFF1, ON/OFF2,
2NDFB/FPWM, SYNC, REF,
SS1, SS2, COMP1,
COMP2 and CSL1
.......................................................−0.3 to (VLIN +0.3)V
LIN................................................................. −0.3 to 6V
CSH1, CSH2, and CSL2 ..................................−0.3 to 7V
Voltage from CBOOT1 to SW1.
and from CBOOT2 to SW2
.......................................................................−0.3 to 5V
Voltage from HDRV1 to SW1
and from HDRV2 to SW2
..............................................................................−0.3V
Voltage from CBOOT1 to
HDRV1 and from CBOOT2
HDRV2
..............................................................................−0.3V
Junction Temp. ..................................................+150°C
Power Dissipation (Note 3) ................................883 mW
Ambient Storage Temp. (TJ)................... −65 to +150°C
Soldering Dwell Time, Temp. (Note 4)
Wave .........................................................4 sec, 260°C
Infrared ...................................................10 sec, 240°C
Vapor Phase............................................ 75 sec, 219°C
ESD Rating (Note 5).................................................. 2 kV

Output Current 20000 mA
Input Min Voltage 5.5 Volt
Input Max Voltage 30 Volt
Feedback Voltage 2.2 Volt
Feedback Tolerance 2 %
Frequency Min 200 kHz
Frequency Max 200 kHz
Efficiency (peak) 96 %
Output Range 2.2V-6.0V (each output)
Adj Switch Frequency Yes
Adjustable Output Yes
Synchronous Rectification Yes
On/Off Pin Yes
Error Flag No
SoftStart Yes
Sync Pin Yes
Inverting No
Flyback No
Lossless Current Sense No
RegType Switching Controller
Temperature Min 0 deg C
Temperature Max 125 deg C
Channels 3 Channels
Special Features Individual softstart allows sequencing; 5V/50mA linear output; FPWM
Topology Buck
PWM Mode Current
Step-Down Yes
Step-Up No
Output Max 6 Volt
Output Min 2.2 Volt
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Description

The LM2640 is a dual step-down power supply controller intended for application in notebook personal computers and other battery-powered equipment.

Fixed-frequency synchronous drive of logic-level N-channel power MOSFETs is combined with an optional pulse-skipping mode to achieve ultra efficient power conversion over a 1000:1 load current range. The pulse-skipping mode can be disabled in favor of fixed-frequency operation regardless of the load current level. High DC gain and current-mode feedback control assure excellent line and load regulation and a wide loop bandwidth for fast response to dynamic loads.

An internal oscillator fixes the switching frequency at 200 kHz. Optionally, switching can be synchronized to an external clock running as fast as 400 kHz.

An optional soft-start feature limits current surges from the input power supply at start up and provides a simple means of start-up sequencing. Logic-level inputs allow the controllers to be turned ON and OFF separately.






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