LP3988ITL-1.85SLASHNOPB datasheet(7/25 Pages) TI1

Part #	LP3988ITL-1.85/NOPB

Description	Micropower, 150-mA Ultra-Low-Dropout CMOS Voltage Regulator

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LP3988

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SNVS161E – OCTOBER 2001 – REVISED OCTOBER 2015

Electrical Characteristics (continued)

Unless otherwise specified: VEN = 1.8 V, VIN = VOUT + 0.5 V, CIN = 1 µF, IOUT = 1 mA, COUT = 1 µF; typical values and limits

are for TJ = 25°C, and minimum and maximum values and limits apply over the entire junction temperature range for

operation,

−40°C to +125°C.

(1)(2)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

POWER GOOD

PG low threshold

VTHL

% of VOUT (PG ON), TJ = 25°C

90%

93%

95%

(See Figure 10)

PG high threshold

VTHH

% of VOUT (PG OFF), TJ = 25°C

(7)

92%

95%

98%

(See Figure 10)

VOL

PG output logic low voltage

IPULLUP = 100 µA, fault condition

0.02

0.1

V

IPGL

PG output leakage current

PG off, VPG = 6 V

0.02

µA

(7)

The low and high thresholds are generated together. Typically a 2.6% difference is seen between these thresholds.

6.6 Timing Requirements

MIN

NOM

MAX

UNIT

TON

PG turnon time(1), VIN = 4.2 V

10

µs

TOFF

PG turnoff time(1), VIN = 4.2 V

10

µs

(1)

Turnon time is time measured between the enable input just exceeding VIH and the output voltage just reaching 95% of its nominal

value.

6.7 Typical Characteristics

Unless otherwise specified, CIN = COUT = 1 µF ceramic, VIN = VOUT + 0.2 V, TA = 25°C, EN pin is tied to VIN.

Figure 1. Ripple Rejection Ratio (LP3988-2.6 V)

Figure 2. Ripple Rejection Ratio (LP3988-2.6 V)

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