LM3281 datasheet(6/26 Pages) TI1

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LM3281

SNVSA38 – NOVEMBER 2014

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6.6 System Characteristics

(1) (2) (3) (4)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

ILOAD_MAX

(5)

Maximum load current

1200

VO_RIPPLE_PWM

PWM mode VOUT ripple

ILOAD = 600 mA

VO_RIPPLE_ECO

ECO mode VOUT ripple

ILOAD = 30 mA

VO_PWM_ACC

PWM mode VOUT

3.2

3.3

3.4

VIN = 3.8 V

VO_ECO_ACC

ECO mode VOUT

3.2

3.3

3.4

ITRIG_PWM_TO_ECO

PWM to ECO mode ILOAD

ILOAD falling

threshold

ITRIG_ECO_TO_PWM

ECO to PWM mode ILOAD

ILOAD rising

threshold

VDROPOUT_BYPASS

Bypass mode total dropout

ILOAD = 600 mA, VIN = 3.2V

voltage with LSW inductor

ILOAD = 1200 mA, VIN = 3.2V

120

160

DCR = 40 m

ION_SOFT_START

Soft-start supply current

EN = low-to-high,

during turnon averaged in

ILOAD ≤ 1 mA

500

1000

any 10-µs window

TON

Turnon transient time from

EN = low-to-high,

EN = high until VOUT is

ILOAD ≤ 1 mA

settled to within ±50 mV of

150

µs

settled value, and full 1200-

mA load may be applied

ILOAD = 1200 mA

89%

PWM mode efficiency

ILOAD = 600 mA

93%

ILOAD = 300 mA

94%

ECO mode efficiency

ILOAD = 30 mA

91%

IQ_CL

Closed loop quiescent

ILOAD = 0 mA

µA

current

VLINE_TR_PWM_PWM

(6)

ILOAD = 600 mA

mVpk

PWM-to-PWM line

VIN = 4.2 V to 3.8 V

TLINE_TR_PWM_PWM

(7)

transient response

VIN = 3.8 V to 4.2 V with 7-µs

0(8)

µS

edge rate

VLOAD_TR_PWM_PWM

(6)

ILOAD = 150 mA to 600 mA or

mVpk

PWM-to-PWM load

ILOAD = 600 mA to 150 mA with

TLOAD_TR_PWM_PWM

(7)

transient response

µS

1-µs edge rate, VIN = 3.8 V

VLOAD_TR_ECO_TO_PWM

(6)

200

mVpk

ECO-to-PWM load

ILOAD = 30 mA to 600 mA with

transient response

1-µs edge rate, VIN = 3.8 V

TLOAD_TR_ECO_TO_PWM

(7)

µS

VIN_RAMP

(9)

ILOAD = 0 mA

Input voltage ramp time

Input power supply rising from

µs

1.2 V to 2.6 V

(1)

All voltages are with respect to the GND pin.

(2)

All TYP characteristics apply to the Simplified Schematic with VIN = 3.8 V, EN = MODE = VIN, at TA = 25°C, device in PWM operation,

unless otherwise noted and assume the following passive components:

(a) CIN = COUT = Samsung 2.2 µF 0201 case size (PN: CL03A225MQ3CRNC)

(b) LSW = Murata 0.47 µH 2012 case size (PN: LQM21PNR47MGH)

(d) CLOAD2 = Samsung 4.7 µF 0402 case size (PN: CL05A475MP5NRNC)

(3)

All system characteristics are specified by design, test or statistical analysis and are not specified by production testing.

(4)

Minimum (MIN) and Maximum (MAX) limits apply over the ambient temperature operating range –30°C to 90°C and over the VIN range

3 V to 5.5 V, unless otherwise noted.

(5)

Refer to section High Maximum Current in this data sheet for load current use case profile.

(6)

Transient magnitude is defined as maximum deviation from final settled value during transient time.

(7)

Transient time is defined as time elapsed from the start of the event to when VOUT is finally within ±50 mV of settled value.

(8)

Transient magnitude does not exceed ± 50 mV of settled value, so transient time is 0 µS.

(9)

This parameter is only applicable when EN is tied to VIN. See Power-On Reset section for further details.

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