LM2621 datasheet(3/16 Pages) TI1

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LM2621

www.ti.com

SNVS033C – MAY 2004 – REVISED MARCH 2005

Electrical Characteristics

Limits in standard typeface are for TJ = 25°C, and limits in boldface type apply over the full operating temperature range of

−40°C to +85°C. Unless otherwise specified: VDD= VOUT= 3.3V.

Symbol

Parameter

Condition

Typ

Min

Max

Units

VIN_ST

Minimum Start-Up Supply Voltage ILOAD = 0mA

1.1

1.2

(1)

VIN_OP

Minimum Operating Supply

ILOAD = 0mA

0.65

Voltage (once started)

VFB

FB Pin Voltage

1.24

1.2028

1.2772

VOUT_MAX

Maximum Output Voltage

VHYST

Hysteresis Voltage (2)

Efficiency

VIN = 3.6V; VOUT = 5V; ILOAD =

500mA

VIN = 2.5V; VOUT = 3.3V; ILOAD =

200mA

Switch Duty Cycle

IDD

Operating Quiescent Current (3)

FB Pin > 1.3V; EN Pin at VDD

110

µA

ISD

Shutdown Quiescent Current (2)

VDD, BOOT and SW Pins at 5.0V;

0.01

2.5

µA

EN Pin <200mV

ICL

Switch Peak Current Limit

2.85

RDS_ON

MOSFET Switch On Resistance

0.17

Enable Section

VEN_LO

EN Pin Voltage Low (4)

0.15VDD

VEN_HI

EN Pin Voltage High (4)

0.7VDD

(1)

Output in regulation, VOUT = VOUT (NOMINAL) ± 5%

(2)

This is the total current into pins VDD, BOOT, SW and FREQ.

(3)

This is the current into the VDD pin.

(4)

When the EN pin is below VEN_LO, the regulator is shut down; when it is above VEN_HI, the regulator is operating.

Pin Functions

Pin Description

Name

Function

PGND

Power Ground

Active-Low Shutdown Input

FREQ

Frequency Adjust. An external resistor connected between this pin and Pin 6 (VDD) sets the switching

frequency of the LM2621.

Output Voltage Feedback

SGND

Signal Ground

VDD

Power Supply for Internal Circuitry

BOOT

Bootstrap Supply for the Gate Drive of Internal MOSFET Power Switch

Drain of the Internal MOSFET Power Switch

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