LM2621 datasheet(3/10 Pages) NSC

3 / 10 page

Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales Office/

Distributors for availability and specifications.

SW Pin Voltage

−0.5 V to 14.5V

BOOT, V

DD, EN and FB Pins

−0.5V to 10V

FREQ Pin

100µA

JA (Note 2)

240˚C/W

Jmax (Note 2)

150˚C

Storage Temperature Range

−65˚C to +150˚C

Lead Temp. (Soldering, 5 sec)

260˚C

Power Dissipation (T

A=25˚C)

(Note 2)

500mW

ESD Rating (Note 3)

2kV

Operating Conditions (Note 1)

DD Pin

2.5V to 5V

FB, EN Pins

0 to V

BOOT Pin

0 to 10V

Ambient Temperature (T

−40˚C to +85˚C

Electrical Characteristics

Limits in standard typeface are for T

J = 25˚C, and limits in boldface type apply over the full operating temperature range of

−40˚C to +85˚C. Unless otherwise specified: V

DD=VOUT= 3.3V.

Symbol

Parameter

Condition

Typ

Min

Max

Units

IN_ST

Minimum Start-Up Supply

Voltage (Note 4)

LOAD = 0mA

1.1

1.2

IN_OP

Minimum Operating Supply

Voltage (once started)

LOAD = 0mA

0.65

FB Pin Voltage

1.24

1.2028

1.2772

OUT_MAX

Maximum Output Voltage

HYST

Hysteresis Voltage (Note 7)

Efficiency

IN = 3.6V; VOUT = 5V; ILOAD

= 500mA

IN = 2.5V; VOUT = 3.3V; ILOAD

= 200mA

Switch Duty Cycle

Operating Quiescent Current

(Note 6)

FB Pin > 1.3V; EN Pin at V

110

µA

Shutdown Quiescent Current

(Note 7)

DD, BOOT and SW Pins at

5.0V; EN Pin <200mV

0.01

2.5

µA

Switch Peak Current Limit

2.85

DS_ON

MOSFET Switch On

Resistance

0.17

Ω

Enable Section

EN_LO

EN Pin Voltage Low (Note 8)

0.15V

EN_HI

EN Pin Voltage High (Note 8)

0.7V

Note 1: Absolute maximum ratings indicate limits beyond which damage to the device may occur. Electrical specifications do not apply when operating the device

outside of its rated operating conditions.

Note 2: The maximum power dissipation must be derated at elevated temperatures and is dictated by Tjmax (maximum junction temperature), θJA (junction to am-

bient thermal resistance), and TA (ambient temperature). The maximum allowable power dissipation at any temperature is Pdmax =(Tjmax -TA)/ θJA or the number

given in the Absolute Maximum Ratings, whichever is lower.

Note 3: The human body model is a 100 pF capacitor discharged through a 1.5 k

Ω resistor into each pin. For Pin 8 (SW) the ESD rating is 1.5 kV.

Note 4: Output in regulation, VOUT =VOUT (NOMINAL) ± 5%

Note 5: This is the hysteresis value of the internal comparator used for the gated-oscillator control scheme.

Note 6: This is the current into the VDD pin.

Note 7: This is the total current into pins VDD, BOOT, SW and FREQ.

Note 8: When the EN pin is below VEN_LO, the regulator is shut down; when it is above VEN_HI, the regulator is operating.

LM2621 数据表(PDF) 3 Page - National Semiconductor (TI)

LM2621 数据表(HTML) 3 Page - National Semiconductor (TI)

Html Pages

1 2 3 4 5 6 7 8 9 10

数据表下载