LP5990

SNVS438B – APRIL 2007 – REVISED DECEMBER 2007

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ELECTRICAL CHARACTERISTICS (continued)

Limits in standard typeface are for TA = 25°C. Limits in boldface type apply over the full operating junction temperature range

(-40°C

≤ TJ ≤ +125°C). Unless otherwise noted, specifications apply to the LP5990 Typical Application Circuit (pg. 1) with: VIN

= VOUT (NOM) + 1.0V, or 2.2V, whichever is higher. VEN = 1.0V, CIN = COUT = 1.0 μF, IOUT = 1.0 mA.

(1), (2)

Symbol

Parameter

Conditions

Min

Typ

Max

Units

VIH

High Input Threshold (VEN)

VIN = 2.2V to 5.5V

1.0

V

IEN

Input Current at VEN Pin

(8)

VEN = 5.5V and VIN = 5.5V

2

5

μA

VEN = 0.0V and VIN = 5.5V

0.001

Transient Characteristics

ΔVOUT

Line Transient (7)

Trise = Tfall = 30μs. ΔVIN = 600 mV

4

mV

Load Transient (7)

IOUT = 1 mA to 200 mA in 1 μs

–50

mV

IOUT = 200 mA to 1 mA in 1 μs

50

TON

Turn on Time

To 98% of VOUT(NOM)

60

μs

TOFF

Turn off Time from Enable

100mV of V OUT(NOM)I OUT= 0mA

500

μs

(8)

There is a 3 M

Ω resistor between VEN and ground on the device.

OUTPUT & INPUT CAPACITOR, RECOMMENDED SPECIFICATIONS

(1)

Symbol

Parameter

Conditions

Min

Nom

Max

Units

CIN

Input Capacitance

Capacitance for stability

0.3

1.0

µF

COUT

Output Capacitance

0.3

1.0

10

ESR

Output/Input Capacitance

5

500

m

Ω

(1)

The minimum capacitance should be greater than 0.3 µF over the full range of operating conditions. The capacitor tolerance should be

30% or better over the full temperature range. The full range of operating conditions for the capacitor in the application should be

considered during device selection to ensure this minimum capacitance specification is met. X7R capacitors are recommended however

capacitor types X5R, Y5V and Z5U may be used with consideration of the application and conditions.

4

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