Datasheet

UC2825A-EP
SGLS305D –JULY 2005–REVISED SEPTEMBER 2010 www.ti.com
Electrical Characteristics (continued)
T
A
= –40°C to 125°C for Q temperature and T
A
= –55°C to 125°C for M temperature, R
T
= 3.65 kΩ, C
T
= 1 nF, V
CC
= 12 V
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
Current Limit/Start Sequence/Fault
I
SS
Soft-start charge current V
SS
= 2.5 V 8 14 20 mA
V
SS
Full soft-start threshold voltage 4.3 5 V
I
DSCH
Restart discharge current V
SS
= 2.5 V 100 250 350 mA
I
SS
Restart threshold voltage 0.3 0.5 V
I
BIAS
ILIM bias current V
ILIM
= 0-V to 2-V step 15 mA
I
CL
Current-limit threshold voltage 0.95 1 1.05 V
Overcurrent threshold voltage 1.14 1.2 1.26 V
t
d
Delay-to-output time, ILIM
(2)
V
ILIM
= 0-V to 2-V step 50 80 ns
Output
I
OUT
= 20 mA 0.25 0.4
Low-level output saturation voltage V
I
OUT
= 200 mA 1.2 2.2
I
OUT
= 20 mA 1.9 2.9
High-level output saturation voltage V
I
OUT
= 200 mA 2 3
t
r
, t
f
Rise/fall time
(2)
C
L
= 1 nF 20 45 ns
Undervoltage Lockout (UVLO)
Start threshold voltage 8.4 9.2 9.6 V
UVLO hysteresis 0.4 0.8 1.2 V
Supply Current
I
su
Startup current V
C
= VCC = V
TH
(start) – 0.5 V 100 300 mA
I
CC
Input current 28 36 mA
(2) Specified by design. Not production tested.
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