LP87702 datasheet(8/98 Pages) TI

8 / 98 page

Limits apply over the junction temperature range –40°C ≤ TJ ≤ 140°C, specified VVANA, VVIN_Bx, VVOUT_Bx, VVOUT_BST, and

IOUT range, unless otherwise noted. Typical values are at TA = 25°C, VVANA = VVIN_Bx = 3.3 V, VOUT_BST = 5 V and VOUT_Bx =

1 V, unless otherwise noted. (1) (2)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

IPFM-PWM

PFM-to-PWM switch -

current threshold(5)

520

IPWM-PFM

PWM-to-PFM switch -

current threshold(5)

240

Output pull-down

resistance

Converter disabled

125

175

BOOST CONVERTER

VIN_BST

Input voltage range for

boost power inputs

2.8

3.3

Input voltage range when

bypass switch mode

selected

4.5

5.5

VOUT_BST

Output voltage, boost

mode

BOOST_VSET = 00

4.9

BOOST_VSET = 01

5.0

BOOST_VSET = 10

5.1

BOOST_VSET = 11

5.2

IOUT_BST

Output current

Both boost and bypass mode

0.6

ILIM_BST

Output current limit

BOOST_ILIM = 00, VIN_BST < 3.6 V

0.8

1.3

BOOST_ILIM = 01, VIN_BST < 3.6 V

1.1

1.4

1.9

BOOST_ILIM = 10, VIN_BST < 3.6 V

1.5

1.9

2.3

BOOST_ILIM = 11, VIN_BST < 3.6 V

2.2

2.8

3.4

VOUT_BST

_DC

DC output voltage

accuracy, includes

voltage reference, DC

load and line regulations,

process and temperature.

Boost mode

Default output voltage

–3%

VDROP

Voltage drop, bypass

mode,

Iout = 250 mA

Ripple voltage, boost

mode

22 µF effective output capacitance

mVp-p

DCLDR

DC load regulation, boost

mode

IOUT = 1 mA to IOUT(max)

0.3%

TLDSR

Transient load step

response, boost mode

IOUT = 1 mA to 250 mA, TR = TF = 1 µs, 22

µF effective output capacitance, VIN > 3 V

–220

220

ISHORT

Short circuit current

limitation

During start-up, both boost and bypass

mode. Short circuit current limit applies until

VOUT_BST = VIN_BST

625

RDS(ON)

BST HS FET

On-resistance, high-side

FET

Pin-to-pin, between SW_BST and

VOUT_BST pins (I = 250 mA)

145

220

mΩ

RDS(ON)

BST LS FET

On-resistance, low-side

FET

Pin-to-pin, between SW_BST and

PGND_BST pins (I = 250 mA)

175

mΩ

ƒSW

Switching frequency,

boost mode

2-MHz setting

1.8

2.2

MHz

4-MHz setting

3.6

4.4

MHz

Start-up time, boost mode

From enable to boost VOUT within 3% of

target value. COUT_BST = 22 µF

450

µs

Output pull-down

resistance

Converter disabled

135

EXTERNAL CLOCK AND PLL

LP87702

SNVSBU3 – MARCH 2021

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