LM2642 Selling Leads, Price trend, LM2642 DataSheet download, circuit diagram from SeekIC.com

Features: `Two synchronous buck regulators`180° out of phase operation`4.5V to 30V input range`Power good function monitors Ch.1`37A Shutdown current`0.04% (typical) line and load regulation error`Current mode control with or without a sense resistor`Independent enable/soft-start pins allow simple...

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SeekIC No. : 004394945 Detail

LM2642: Features: `Two synchronous buck regulators`180° out of phase operation`4.5V to 30V input range`Power good function monitors Ch.1`37A Shutdown current`0.04% (typical) line and load regulation error`C...

LM2642 Data Sheet

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Part Number:: LM2642
Supply Ability:: 5000

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Upload time: 2024/11/21

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Product Details

Description

Features:

`Two synchronous buck regulators
`180° out of phase operation
`4.5V to 30V input range
`Power good function monitors Ch.1
`37A Shutdown current
`0.04% (typical) line and load regulation error
`Current mode control with or without a sense resistor
`Independent enable/soft-start pins allow simple sequential startup configuration.
`Configurable for single output parallel operation. (See Figure 2).
`Adjustable cycle-by-cycle current limit
`Input under-voltage lockout
`Output over-voltage latch protection
`Output under-voltage protection with delay
`Thermal shutdown
`Self discharge of output capacitors when the regulator is OFF
`TSSOP package

Application

·Embedded computer systems
·High end gaming systems
·Set-top boxes
·WebPAD

Pinout

Connection Diagram

Specifications

If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Voltages from the indicated pins to SGND/PGND:
VIN, ILIM1, ILIM2, KS1, KS2 .....................−0.3V to 32V
SW1, SW2, RSNS1, RSNS2 .............−0.3 to (VIN +0.3)V
FB1, FB2, VDD1, VDD2 ................................−0.3V to 6V
PGOOD, COMP1, COMP2, UV
Delay.........................................−0.3V to (VLIN5 +0.3)V
ON/SS1, ON/SS2 (Note 2)...........−0.3V to (VLIN5+0.6)V
CBOOT1 to SW1, CBOOT2 to SW2 ..............−0.3V to 7V
LDRV1, LDRV2............................... −0.3V to (VDD+0.3)V
HDRV1 to SW1, HDRV2 to SW2 ............................ −0.3V
HDRV1 to CBOOT1, HDRV2 to
CBOOT2................................................................ +0.3V
Power Dissipation (TA = 25°C),
(Note 3).................................................................. 1.1W
Ambient Storage Temperature
Range............................................... −65°C to +150°C
Soldering Dwell Time, Temperature
(Note 4)
Wave..........................................................4 sec, 260°C
Infrared.....................................................10sec, 240°C
Vapor Phase..............................................75sec, 219°C
ESD Rating (Note 5) ...................................................2kV

Output Current	20000 mA
Input Min Voltage	4.5 Volt
Input Max Voltage	30 Volt
Feedback Voltage	1.238 Volt
Feedback Tolerance	2 %
Frequency Min	300 kHz
Frequency Max	300 kHz
Efficiency (peak)	Undefined %
Output Range	1.238V-27V (each output)
Adj Switch Frequency	No
Adjustable Output	Yes
Synchronous Rectification	Yes
On/Off Pin	Yes
Error Flag	Yes
SoftStart	Yes
Sync Pin	No
Inverting	No
Flyback	No
Lossless Current Sense	Yes
RegType	Switching Controller
Temperature Min	-40 deg C
Temperature Max	125 deg C
Channels	2 Channels
Special Features	180deg out-of-phase channels; Individual softstart allows sequencing
Topology	Buck
PWM Mode	Current
Step-Down	Yes
Step-Up	No
Output Power	Undefined Watt
Output Max	27 Volt
Output Min	1.238 Volt
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Description

The LM2642 consists of two current mode synchronous buck regulator controllers with a switching frequency of 300kHz.

The two switching regulator controllers operate 180° out of phase. This feature reduces the input ripple RMS current, thereby significantly reducing the required input capacitance. The two switching regulator outputs can also be paralleled to operate as a dual-phase single output regulator.

The output of each channel can be independently adjusted from 1.3 to VIN• maximum duty cycle. An internal 5V rail is also available externally for driving bootstrap circuitry. Current-mode feedback control assures excellent line and load regulation and a wide loop bandwidth for excellent response to fast load transients. Current is sensed across either the Vds of the top FET or across an external currentsense resistor connected in series with the drain of the top FET. Current limit is independently adjustable for each channel. The LM2642 features analog soft-start circuitry that is independent of the output load and output capacitance. This makes the soft-start behavior more predictable and controllable than traditional soft-start circuits.

A PGOOD1 pin is provided to monitor the dc output of channel 1. Over-voltage protection is available for both outputs. A UV-Delay pin is also available to allow delayed shut off time for the IC during an output under-voltage event.

LM2642

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