L6995STR datasheet(1/26 Pages) STMICROELECTRONICS

部件名	L6995STR

功能描述	LOSSLESS CURRENT LIMIT

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制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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L6995S

April 2004

1

FEATURES

■

CONSTANT ON TIME TOPOLOGY ALLOWS

OPERATION WITH LOWER DUTY THAN

PWM TOPOLOGY

■

VERY FAST LOAD TRANSIENTS

■

5V Vcc SUPPLY

■

1.5V TO 35V INPUT VOLTAGE RANGE

■

0.9V ±1% VREF

■

MINIMUM OUTPUT VOLTAGE AS LOW AS 0.9V

■

SELECTABLE SINKING MODE

■

LOSSLESS CURRENT LIMIT

■

REMOTE SENSING

■

OVP,UVP LATCHED PROTECTIONS

■

600

µA TYP QUIESCENT CURRENT

■

POWER GOOD AND OVP SIGNALS

■

PULSE SKIPPING AT LIGHT LOADS

2

APPLICATIONS

■

I/O BUS FOR CPU CORE SUPPLY

■

NOTEBOOK COMPUTERS

■

NETWORKING DC-DC

■

DISTRIBUTED POWER

3

DESCRIPTION

The device is a step-down controller specifically de-

signed to provide extremely high efficiency conver-

sion, with losses current sensing tecnique.

The "constant on-time" topology assures fast load

transient response. The embedded "voltage feed-for-

ward" provides nearly constant switching frequency

operation.

An integrator can be introduced in the control loop to

reduce the static output voltage error.

The available remote sensing improve the static and

dynamic regulation recovering the wires voltage

drop. Pulse skipping technique reduces power con-

sumption at light load. Drivers current capability al-

lows output current in excess of 20A.

STEP DOWN CONTROLLER FOR HIGH DIFFERENTIAL

INPUT-OUTPUT CONVERSION

Figure 2. Minimum Component Count Application

SS

C

BOOT

OUT

C

0.9V

Vo

L6995S

35V

Rin2

Rin1

CIN

RILIM

5V

INT

VFB

SS

OSC

BOOT

HGATE

PHASE

LGATE

PGND

GND

NOSKIP

ILIM

VSENSE

VREF

5V

VREF

C

L

BOOT

D

HS

LS

DS

REV. 1

Figure 1. Package

Table 1. Order Codes

Part Number

Package

L6995S

TSSOP20

L6995STR

Tape & Reel

TSSOP20

Obsolete

Product(s)

- Obsolete

Product(s)

类似零件编号 - L6995STR

制造商	部件名	数据表	功能描述
STMicroelectronics	L6995	336Kb / 25P	STEP DOWN CONTROLLER FOR HIGH DIFFERENTIAL INPUT-OUTPUT CONVERSION Dec-2002
	L6995D	336Kb / 25P	STEP DOWN CONTROLLER FOR HIGH DIFFERENTIAL INPUT-OUTPUT CONVERSION Dec-2002
	L6995DTR	336Kb / 25P	STEP DOWN CONTROLLER FOR HIGH DIFFERENTIAL INPUT-OUTPUT CONVERSION Dec-2002

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