LM2640

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具有 LDO 的 5.5V 至 30V、200kHz 同步 D-CAP2 模式双路降压控制器

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数据表

document-pdfAcrobat LM2640 Dual Adjustable Step-Down Switching Power Supply Controller 数据表 (Rev. B) (英语)

LM2640

正在供货

数据表

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产品详情

Vin (min) (V)

5.5

Vin (max) (V)

Iout (max) (A)

Operating temperature range (°C)

0 to 125

Control mode

D-CAP2, current mode

Rating

Catalog

Vout (min) (V)

2.2

Vout (max) (V)

Iq (typ) (A)

0.0006

Duty cycle (max) (%)

Number of phases

Vin (min) (V)

5.5

Vin (max) (V)

Iout (max) (A)

Operating temperature range (°C)

0 to 125

Control mode

D-CAP2, current mode

Rating

Catalog

Vout (min) (V)

2.2

Vout (max) (V)

Iq (typ) (A)

0.0006

Duty cycle (max) (%)

Number of phases

TSSOP (PW)

62.08 mm² 9.7 x 6.4

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 Package

Key Specifications

96% Efficient
5.5V to 30V Input Range
Dual Outputs Adjustable from 2.2V to 6V
0.5% Typical Load Regulation Error
0.002%/V Typical Line Regulation Error

All trademarks are the property of their respective owners.

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 Package

Key Specifications

96% Efficient
5.5V to 30V Input Range
Dual Outputs Adjustable from 2.2V to 6V
0.5% Typical Load Regulation Error
0.002%/V Typical Line Regulation Error

All trademarks are the property of their respective owners.

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.

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

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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