LM2621 datasheet(3/11 Pages) NSC

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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

ambient 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.

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