6

LP3991

SNVS296J – DECEMBER 2006 – REVISED JUNE 2016

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Electrical Characteristics (continued)

Unless otherwise noted, VEN = 950 mV, VIN = VOUT + 0.5 V, or 1.8 V, whichever is higher, CIN = 1 µF, COUT = 4.7 µF, IOUT =

1 mA. Typical values and limits apply for TA = 25°C. Minimum and maximum limits apply over the full junction temperature

range for operation,

−40°C to +125°C, unless otherwise specified.

(1)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

(11) The capacitor tolerance must be 30% or better over temperature. The full operating conditions for the application must be considered

when selecting a suitable capacitor to ensure that the minimum value of capacitance is always met. Recommended capacitor type is

X7R or X5R. (See External Capacitors in Detailed Design Procedure.)

(12) On lower voltage options, 2.2-µF output capacitor may be used but some degradation in load transient (10 -15%) can be expected,

compared to a 4.7-µF capacitor.

TIMING CHARACTERISTICS

Transient

Response

Line transient response |

δVOUT|

Trise = Tfall = 30 µs

(9)

δVIN = 600 mV

6

mV

(pk - pk)

Load transient response |

δVOUT|

Trise = Tfall = 1 µs

(9)

IOUT = 0 mA to 300 mA

140

mV

IOUT = 1 mA to 300 mA

110

IOUT = 300 mA to 1 mA

80

IOUT = 0 mA to 200 mA

110

IOUT = 1 mA to 200 mA

80

IOUT = 200 mA to 1 mA

60

IOUT = 0 mA to 150 mA

100

IOUT = 1 mA to 150 mA

70

IOUT = 150 mA to 1 mA

50

Overshoot on start-up

0%

2%

IIR

In-rush current(9)

600

1000

mA

OUTPUT CAPACITANCE

COUT

Output capacitor

Capacitance(11)

VOUT ≥ 1.5 V

2

4.7

µF

VOUT < 1.5 V

(12)

1.6

2.2

ESR

5

500

m

Ω

(1)

This electrical specification is ensured by design.

6.6 Timing Requirements

MIN

NOM

MAX

UNIT

tON

Turnon time(1) To 95% Level

VIN(MIN) to 3.6 V, VOUT ≤ 2 V

100

µs

Turnon time(1) To 95% Level

VIN(MIN) to 3.6 V, VOUT ≥ 2 V

140