TPS5103DB Datasheet

IC型號(hào)：
TPS5103DB
PDF描述：
MULTIPLE MODE SYNCHRONOUS DC/DC CONTROLLER
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1050.38KB
PDF頁(yè)數(shù)：
37頁(yè)
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TI

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TPS5103

MULTIPLE MODE SYNCHRONOUS DC/DC CONTROLLER

SLVS240 鈥?SEPTEMBER 1999

Step-Down DC-DC Converter

Three Operation-Mode

鈥?Heavy Load:

鈥?Fixed Frequency PWM

鈥?Hysteretic (User Selctable)

鈥?Light Load:

鈥?Skip Mode

4.5 V to 25 V Input Voltage Range

Adjustable Output Voltage Down to 1.2 V

95% Efficiency

Stand-By Control

Over Current Protection

UVLO for Internal 5 V Regulation

Low Standby Current . . . 0.5 mA Typical

= 鈥?0擄C to 85擄C

DB PACKAGE

(TOP VIEW)

SOFTSTART

INV

GND

REF

COMP

PWMSKIP

STBY

OUT_u

OUT_d

OUTGND

TRIP

VCC_SENSE

VCC

VREF5

VREG5V_IN

description

The TPS5103 is a synchronous buck dc/dc controller, designed for notebook PC system power. The controller

has three user-selectable operation modes available; hysteretic mode, fixed frequency PWM control, or SKIP

control.

In high current applications, where fast transient response is advantageous for reducing bulk capacitance, the

hysteretic mode is selected by connecting the Rt pin to Vref5. Selecting the PWM/SKIP modes for less

demanding transient applications is ideal for conserving notebook battery life under light load conditions. The

device includes high-side and low-side MOSFET drivers capable of driving low Rds (on) N鈥揷hannel MOSFETs.

The user-selectable overcurrent protection (OCP) threshold is set by an external TRIP pin resister in order to

protect the system. The TPS5103 is configured so that a current sense resistor is not required, improving the

operating efficiency.

TPS5103

SOFTSTART

INV

OUTU

OUTD

OUTGND

GND

TRIP

REF

VCCSENSE

COMP

VCC

PWM/SKIP

VREF5

STBY

VREG5V_IN

OUTPUT

Figure 1. Typical Design

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

TI is a trademark of Texas Instruments Incorporated.

PRODUCT PREVIEW information concerns products in the formative or

design phase of development. Characteristic data and other

specifications are design goals. Texas Instruments reserves the right to

change or discontinue these products without notice.

漏

1999, Texas Instruments Incorporated

POST OFFICE BOX 655303

鈥?/div>

DALLAS, TEXAS 75265

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