LP8733 datasheet(9/86 Pages) TI

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LP8733

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SNVSBK2 – SEPTEMBER 2019

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Electrical Characteristics (continued)

Limits apply over the junction temperature range –40°C

≤ TJ ≤ +140°C, specified VVANA, VVIN_Bx, VVIN_LDOx, VVOUT_Bx, VVOUT_LDOx

and IOUT range, unless otherwise noted. Typical values are at TJ = 25°C, VVANA = VVIN_Bx = VVIN_LDOx = 3.7 V, and VOUT = 1 V,

unless otherwise noted.

(1)(2).

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

(6)

The external clock frequency must be selected so that buck switching frequency is above 1.7 MHz.

Output voltage

monitoring for PGOOD

pin and for power-good

interrupt

Overvoltage monitoring, voltage rising

(compared to DC output voltage level,

VOUT_LDO_DC)

106%

108%

110%

Overvoltage monitoring, hysteresis

3.5%

Undervoltage monitoring, voltage falling

(compared to DC output voltage level,

VOUT_LDO_DC)

90%

92%

94%

Undervoltage monitoring, hysteresis

3.5%

Deglitch time during operation and after

voltage change

µs

Gating time for PGOOD

signal after regulator

enable or voltage

change

PGOOD_MODE = 0

800

µs

EXTERNAL CLOCK AND PLL

fEXT_CLK

External input clock(6)

Nominal frequency

MHz

Nominal frequency step size

Required accuracy from nominal frequency

–30%

10%

External clock detection

Delay for missing clock detection

1.8

µs

Delay and debounce for clock detection

Clock change delay

(internal to external)

Delay from valid clock detection to use of

external clock

600

µs

PLL output clock jitter

Cycle to cycle

300

ps, p-p

PROTECTION FUNCTIONS

Thermal warning

Temperature rising, TDIE_WARN_LEVEL = 0

115

125

135

°C

Temperature rising, TDIE_WARN_LEVEL = 1

127

137

147

Hysteresis

Thermal shutdown

Temperature rising

140

150

160

°C

Hysteresis

VANAOVP

VANA overvoltage

Voltage rising

5.6

5.8

6.1

Voltage falling

5.45

5.73

5.96

Hysteresis

VANAUVLO

VANA undervoltage

lockout

Voltage rising

2.51

2.63

2.75

Voltage falling

2.5

2.6

2.7

Buck short-circuit

detection

Threshold

280

360

440

LDO short-circuit

detection

Threshold

190

300

450

LOAD CURRENT MEASUREMENT FOR BUCK REGULATORS

Current measurement

range

Maximum code

10.22

Resolution

LSB

Measurement accuracy

IOUT > 1 A per phase

<10%

Measurement time

PFM mode (automatically changing to PWM

mode for the measurement)

µs

PWM mode

CURRENT CONSUMPTION

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