LM5642MH/NOPB

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Texas Instruments

4.5-36V, CURRENT MODE DUAL SYNCHRONOUS BUCK CONTROLLER WITH OSCILLATOR SYNCHRONIZATION

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LM5642MH/NOPB

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Texas Instruments

4.5-36V, CURRENT MODE DUAL SYNCHRONOUS BUCK CONTROLLER WITH OSCILLATOR SYNCHRONIZATION

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Description Specifications Series Pricing CAD Documents

Description

General part information

LM5642 Series

The LM5642 series consists of two current mode synchronous buck regulator controllers operating 180° out of phase with each other at a normal switching frequency of 200kHz for the LM5642 and at 375kHz for the LM5642X.

Out of phase operation reduces the input RMS ripple current, thereby significantly reducing the required input capacitance. The switching frequency can be synchronized to an external clock between 150 kHz and 250 kHz for the LM5642 and between 200 kHz and 500 kHz for the LM5642X. 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 1.3V to 90% of Vin. An internal 5V rail is also available externally for driving bootstrap circuitry.

Technical Specifications

Parameters and characteristics for this part

Specification	LM5642MH/NOPB

Clock Sync	Yes
Control Features	Enable, Soft Start, Current Limit
Duty Cycle (Max)	98.9 %
Frequency - Switching	200 kHz
Function	Step-Down
Mounting Type	Surface Mount
Number of Outputs	2
Operating Temperature (Max)	125 °C
Operating Temperature (Min)	-40 °C
Output Configuration	Positive
Output Phases	2
Output Type	Transistor Driver
Package Length	0.173 in
Package Name	28-HTSSOP, 28-PowerTSSOP
Package Width	4.4 mm
Synchronous Rectifier	Yes
Topology	Buck
Voltage - Supply (Vcc/Vdd) Maximum	36 V
Voltage - Supply (Vcc/Vdd) Minimum	4.5 V

LM5642 Series

4.5-36V, Current Mode Dual Synchronous Buck Controller with Oscillator Synchronization

Part	Synchronous Rectifier	Output Phases	Control Features	Voltage - Supply (Vcc/Vdd) Minimum	Voltage - Supply (Vcc/Vdd) Maximum	Operating Temperature (Max)	Operating Temperature (Min)	Mounting Type	Output Type	Clock Sync	Function	Package Name	Topology	Number of Outputs	Frequency - Switching	Output Configuration	Duty Cycle (Max)	Package Width	Package Length
Texas Instruments LM5642XMH/NOPB	Yes	2	Current Limit Enable Soft Start	4.5 V	36 V	125 °C	-40 °C	Surface Mount	Transistor Driver	Yes	Step-Down	28-HTSSOP 28-PowerTSSOP	Buck	2	375 kHz	Positive	98.9 %	4.4 mm	0.173 in
Texas Instruments LM5642XMTX/NOPB	Yes	2	Current Limit Enable Soft Start	4.5 V	36 V	125 °C	-40 °C	Surface Mount	Transistor Driver	Yes	Step-Down	28-TSSOP	Buck	2	375 kHz	Positive	98.9 %	4.4 mm	0.173 in
Texas Instruments LM5642MTC/NOPB	Yes	2	Current Limit Enable Soft Start	4.5 V	36 V	125 °C	-40 °C	Surface Mount	Transistor Driver	Yes	Step-Down	28-TSSOP	Buck	2	200 kHz	Positive	98.9 %	4.4 mm	0.173 in
Texas Instruments LM5642XMHX	Yes	2	Current Limit Enable Soft Start	4.5 V	36 V	125 °C	-40 °C	Surface Mount	Transistor Driver	Yes	Step-Down	28-HTSSOP 28-PowerTSSOP	Buck	2	375 kHz	Positive	98.9 %	4.4 mm	0.173 in
Texas Instruments LM5642XMHX/NOPB	Yes	2	Current Limit Enable Soft Start	4.5 V	36 V	125 °C	-40 °C	Surface Mount	Transistor Driver	Yes	Step-Down	28-HTSSOP 28-PowerTSSOP	Buck	2	375 kHz	Positive	98.9 %	4.4 mm	0.173 in
Texas Instruments LM5642MTCX/NOPB	Yes	2	Current Limit Enable Soft Start	4.5 V	36 V	125 °C	-40 °C	Surface Mount	Transistor Driver	Yes	Step-Down	28-TSSOP	Buck	2	200 kHz	Positive	98.9 %	4.4 mm	0.173 in
Texas Instruments LM5642XMT/NOPB	Yes	2	Current Limit Enable Soft Start	4.5 V	36 V	125 °C	-40 °C	Surface Mount	Transistor Driver	Yes	Step-Down	28-TSSOP	Buck	2	375 kHz	Positive	98.9 %	4.4 mm	0.173 in
Texas Instruments LM5642XMH	Yes	2	Current Limit Enable Soft Start	4.5 V	36 V	125 °C	-40 °C	Surface Mount	Transistor Driver	Yes	Step-Down	28-HTSSOP 28-PowerTSSOP	Buck	2	375 kHz	Positive	98.9 %	4.4 mm	0.173 in
Texas Instruments LM5642MH/NOPB	Yes	2	Current Limit Enable Soft Start	4.5 V	36 V	125 °C	-40 °C	Surface Mount	Transistor Driver	Yes	Step-Down	28-HTSSOP 28-PowerTSSOP	Buck	2	200 kHz	Positive	98.9 %	4.4 mm	0.173 in
Texas Instruments LM5642MTCX/NOPB	Yes	2	Current Limit Enable Soft Start	4.5 V	36 V	125 °C	-40 °C	Surface Mount	Transistor Driver	Yes	Step-Down	28-TSSOP	Buck	2	200 kHz	Positive	98.9 %	4.4 mm	0.173 in

Pricing

Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly

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CAD

3D models and CAD resources for this part

Documents

Technical documentation and resources

Power Management Guide 2018 (Rev. R)

Power Management Considerations for FPGAs and ASICs

LM5642/42X High V, Dual Sync Buck Converter w/Oscil Sync datasheet (Rev. K)

AN-1292 LM5642 Evaluation Board (Rev. B)

Reduce buck-converter EMI and voltage stress by minimizing inductive parasitics