LM3253

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SNVS791Q – FEBRUARY 2012 – REVISED MAY 2013

SYSTEM CHARACTERISTICS

The following spec table entries are specified by design and verifications providing the component values in the Typical

Application Circuit are used (L = 1.5 µH, DCR = 90 m

CL05A475MQNRN; 6.3V, 0201 Samsung CL03A105MQ3CSN; 6.3V, 01005 Murata GRM022R60J332K).

These parameters are not verified by production testing. Min and Max values are specified over the ambient temperature

otherwise stated.

Symbol

Parameter

Conditions

Min

Typ

Max

Units

Time for SW pin to become

EN = LOW-to-HIGH

30

active upon power-up

Turn-on time (time for output

µs

to reach 90% of final value

50

after EN LOW-to-HIGH

transition)

to 3V (90% or 2.7V)

VCON = 0V to 1.2V

20

3.6V to 2.6V (10% or 2.7V)

VCON = 1.44V to 1.04V

1.8V to 2.8V (90% or 2.7V)

VCON = 0.72V to 1.12V

µs

15

2.8V to 1.8V (10% or 1.9V)

VCON = 1.12V to 0.72V

to 3.4V (90% or 3.1V)

VCON = 0V to 1.4V

20

3.4V to 0.4V (10% or 0.7V)

VCON = 1.4V to 0.16V

to PVIN after BP LOW-to-

20

HIGH transition (90%)

µs

Bypass turn-on time. Time for

50

after EN LOW-to-HIGH

transition (90% or 3.24)

VCON = 1.5V, Max value at

Total dropout resistance in

45

55

m

Ω

bypass mode

Inductor ESR

≤ 151 mΩ

Pin input capacitance for BP,

Test frequency = 100 KHz

5

pF

EN, MODE

Maximum load current in

Switcher + ACB

3.0

PWM mode

Maximum output transient

3.4

A

pullup current limit

PWM maximum output

−3.0

transient pulldown current limit

Maximum output load current

85

mA

in PFM mode

−3

+3

%

Linearity in control range of

(1)

VCON = 0.16V to 1.44V

Monotonic in nature

−50

+50

mV

(1)

Current limit is built-in, fixed, and not adjustable.

(2)

Linearity limits are ±3% or ±50 mV, whichever is larger.

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