2)

If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales Office/

Distributors for availability and specifications.

V

SGND

−0.2V to 6V

PGND to SGND

-0.2V to +0.2V

SDA, SCL, EN, EN2, nPOR1,

nPOR2, SW1, SW2, FB1 &

FB2

(GND - 0.2) to (V

0.2V)

Maximum Continuous Power

Dissipation (P

Internally Limited

Junction Temperature (T

125˚C

Storage Temperature Range

−65˚C to +150˚C

Maximum Lead Temperature

(Soldering)

(Note 4)

ESD Ratings (Note 5)

All Pins

2 kV HBM

200V MM

Input Voltage Range ((Note 10))

2.7V to 5.5V

Recommended Load Current Per Channel

0mA to 600mA

Junction Temperature (T

−30˚C to +125˚C

Ambient Temperature (T

−30˚C to +85˚C

Thermal Properties (Note 7)

Junction-to-Ambient Thermal Resistance

(

θ

26˚C/W

its appearing in boldface type apply over the entire junction temperature range (T

noted, V

Symbol

Parameter

Conditions

Min

Typ

Max

Units

V

FB

Feedback Voltage

(Note 11)

-3.5

+3.5

%

V

OUT

Line Regulation

2.7V

≤ V

IN

≤ 5.5V

I

0.031

%/V

Load Regulation

100mA

≤ I

O

≤ 600mA

V

0.0013

%/mA

I

Quiescient Current “On”

PFM Mode, Both Bucks ON

34

µA

I

Quiescient Current “Off”

EN1 = EN2 = 0V

0.2

3

µA

I

LIM

Peak Switching Current Limit

V

850

1200

1400

mA

R

DS_ON

PFET

V

390

500

m

Ω

NFET

V

240

350

F

OSC

Internal Oscillator Frequency

1.5

2.0

2.4

MHz

I

EN

Enable (EN) Input Current

0.01

1

µA

V

IL

Enable Logic Low

0.4

V

V

IH

Enable Logic High

1.0

V

POWER ON RESET THRESHOLD/FUNCTION (POR)

nPOR1 &

nPOR2

Delay Time

nPOR1 = Power ON Reset

for Buck 1

50 mS (default)

50

mS

nPOR2 = Power ON Reset

for Buck 2

Can be pre-trimmd to 50 uS, 100

mS & 200 mS

POR

Threshold

Percentage of Target V

OUT

V

94

%

V

be pre-trimmed to 70% or 94%

85

Note 1: Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which operation of the device

is guaranteed. Operating Ratings do not imply guaranteed performance limits. For guaranteed performance limits and associated test conditions, see the Electrical

Characteristics tables.

Note 2: All voltages are with respect to the potential at the GND pin.

Note 4: For detailed soldering specifications and information, please refer to National Semiconductor Application Note 1187: Leadless Leadframe Package (LLP)

(AN-1187).

Note 5: The Human body model is a 100 pF capacitor discharged through a 1.5 k

Ω resistor into each pin. (MIL-STD-883 3015.7) The machine model is a 200 pF

capacitor discharged directly into each pin. (EAIJ)

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