Datasheet

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SLUS212E − NOVEMBER 1999 − REVISED FEBRUARY 2004
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
electrical characteristics unless otherwise stated, these parameters apply for T
A
= −40°C to 100°C
for the UC285-x series and 0°C to 100°C for the UC385-x, VB = 5 V; VIN = 3.3 V, VOUT = 2.5 V, T
A
= T
J
.
PARAMETER TEST CONDITION MIN TYP MAX UNIT
UC385−2 Fixed 2.1 V, 5-A Family (continued)
VIN dropout voltage (VIN - VOUT)
I
VOUT
= 5 A, T
J
= 25°C 350 425 mV
VIN dropout voltage (VIN - VOUT)
UC385-2 I
VOUT
= 5 A 350 490 mV
UC285-2 I
VOUT
= 5 A 350 500 mV
VB dropout (VB - VOUT)
UC385-2 I
VOUT
= 5 A 1.8 2.1 V
VB dropout (VB - VOUT)
UC285-2 I
VOUT
= 5 A 1.8 2.2 V
Short circuit current limit 5.1 7.5 A
VB current
I
VOUT
= 10 mA 8 15 mA
VB current
I
VOUT
= 5 A 40 100 mA
VIN current I
VOUT
= 5 A 4.9 4.96 A
UC385−1 Fixed 1.5 V, 5-A Family
Output voltage
UC385-1 I
VOUT
= 100 mA 1.485 1.5 1.515 V
Output voltage
UC285-1 I
VOUT
= 100 mA 1.470 1.5 1.515 V
Load regulation I
VOUT
= 10 mA to 5 A 0.5 4 mV
VIN PSRR 80 110 dB
VB PSRR 50 65 dB
VIN dropout voltage (VIN - VOUT)
I
VOUT
= 5 A, T
J
= 25°C 350 425 mV
VIN dropout voltage (VIN - VOUT)
UC285-1 I
VOUT
5 A 350 490 mV
UC285-2 I
VOUT
= 5 A 350 500 mV
VB dropout (VB - VOUT)
UC385-1 I
VOUT
= 5 A 1.8 2.1 V
VB dropout (VB - VOUT)
UC285-1 I
VOUT
= 5 A 1.8 2.2 V
Short circuit current limit 5.1 7.5 A
VB current
I
VOUT
= 10 mA 8 15 mA
VB current
I
VOUT
= 5 A 40 100 mA
VIN = current I
VOUT
= 5 A 4.9 4.96 A
UC385-ADJ Adjustable, 5-A Family
ADJ voltage
UC385-ADJ I
VOUT
- 100 mA 1.188 1.2 1.212 V
ADJ voltage
UC285-ADJ I
VOUT
- 100 mA 1.176 1.2 1.212 V
Load regulation I
VOUT
= 10 mA to 5 A 0.5 4 mV
VIN PSRR VOUT programmed for 2.5 V 80 110 dB
VB PSRR VOUT Programmed for 2.5 V 50 65 dB
VIN dropout voltage (VIN - VOUT)
I
VOUT
= 5 A, T
J
= 25°C 350 425 mV
VIN dropout voltage (VIN - VOUT)
UC385-ADJ I
VOUT
= 5 A 350 490 mV
UC285-ADJ I
VOUT
= 5 A 350 500 mV
VB dropout (VB - VOUT)
UC385-ADJ I
VOUT
= 5 A 1.8 2.1 V
VB dropout (VB - VOUT)
UC285-ADJ I
VOUT
= 5 A 1.8 2.2 V
Short circuit current limit 5.1 7.5 A
VB current
I
VOUT
= 10 mA 8 15 mA
VB current
I
VOUT
= 5 A 40 100 mA
VIN current I
VOUT
= 5 A 4.9 4.96 A