SC414/SC424

7

Electrical Characteristics (continued)

Parameter

Conditions

Min

Typ

Max

Units

Linear Regulator — LDO (not available for V5V < 5V)

VLDO Accuracy

VLDO load = 10mA

4.9

5.0

5.1

V

LDO Current Limit

Start-up and foldback, V

IN

= 12V

85

mA

Operating current limit, V

IN

= 12V

135

200

-140

+140

mV

-450

+450

mV

VLDO to VOUT Switch-over Resistance

V

OUT

= +5V

2

Ω

From V

IN

to V

VLDO

, V

VLDO

= +5V, I

VLDO

= 100mA

1.2

V

Notes:

(1)

V

IN

UVLO is programmable using a resistor divider from VIN to ENL to AGND. The ENL voltage is compared to an internal reference.

(2)

Guaranteed by design.

(3)

For V5V less than 4.5V, the On-Time may be limited by the V5V supply voltage and by V

IN

. See the TON Limitations and V5V Supply Voltage

section in the applications Information.

(4)

The switch-over threshold is the maximum voltage differential between the VLDO and VOUT pins which ensures that VLDO will internally

switch-over to V

OUT

. The non-switch-over threshold is the minimum voltage differential between the VLDO and VOUT pins which ensures that

VLDO will not switch-over to V

OUT

.

(5)

The LDO drop out voltage is the voltage at which the LDO output drops 2% below the nominal regulation point. Thermal resistance, junction

to ambient — guaranteed by design (°C/W)