RT8230A/B/C/D/E
7
DS8230A/B/C/D/E-04 February 2014 www.richtek.com
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Copyright 2014 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation.
Parameter Symbol Test Conditions Min Typ Max Unit
Frequency Control
V
IN
= 20V, V
OUT1
= 5V, R
TON
= 100k 240 300 360
Switching Frequency f
SWx
V
IN
= 20V, V
OUT2
= 3.33V, R
TON
= 100k 280 355 430
kHz
Minimum Off-Time T
LGATEx
V
FBX
= 1.9V -- 275 350 ns
Ultrasonic Mode Frequency f
AS M
V
ENM
= LDO5 25 33 -- kHz
Soft-Start
Soft-Start Time T
SSX
From ENTRIP Enable -- 0.8 -- ms
Current Sense
ENTRIPx Source Current I
ENTRIPx
V
ENTRIPx
= 0.9V 4.5 5 5.5 A
ENTRIPx Current
Temperature Coefficient
TC
IENTRIPx
In Comparison with 25C -- 4700 -- ppm/C
Zero-Current Threshold V
ZC
V
FBx
= 2.05V, GND
PHASEx -- 1 -- mV
Internal Regulator
V
IN
= 12V, No Load 4.9 5 5.1
V
IN
> 7V, I
LDO5
< 100mA 4.8 5 5.1
V
IN
> 5.5V, I
LDO5
< 35mA 4.8 5 5.1
LDO5 Output Voltage V
LDO5
V
IN
> 5V, I
LDO5
< 20mA 4.5 4.75 5.1
V
V
IN
= 12V, No Load 3.267 3.3 3.333
V
IN
> 7V, I
LDO3
< 100mA 3.217 3.3 3.383
V
IN
> 5.5V, I
LDO3
< 35mA 3.267 3.3 3.333
LDO3 Output Voltage V
LDO3
V
IN
> 5V, I
LDO3
< 20mA 3.217 3.3 3.383
V
LDO5 Output Current I
LDO5
V
LDO5
= 4.5V, V
BYP1
= GND, V
IN
= 7.4V 100 175 -- mA
LDO3 Output Current I
LDO3
V
LDO3
= 3V, V
IN
= 7.4V 100 175 -- mA
LDO5 Switchover Threshold
to BYP1
V
SWTH
Rising Edge At BYP1 Regulation Point 4.4 4.66 4.79 V
LDO5 Switchover Equivalent
Resistance
R
SW
LDO5 to BYP1, 10mA -- 1.5 3
UVLO
Rising Edge -- 4.3 4.5
LDO5 UVLO Threshold V
UVLO5
Falling Edge 3.7 3.9 4.1
LDO3 UVLO Threshold V
UVLO3
Controllers Off -- 2.5 --
V
Power Good
PGOOD Detect, V
FBx
Rising Edge 87 92.5 96
PGOOD Threshold V
PGxTH
Hysteresis -- 8 --
%
PGOOD Leakage Current High State, V
PGOOD
= 5.5V -- -- 1 A
PGOOD Output Low Voltage I
SINK
= 4mA -- -- 0.3 V
Fault Detection
OVP Trip Threshold V
OVP
FBx with Respect to Internal Reference 109 113 117 %
OVP Propagation Delay -- 1 -- s
UVP Trip Threshold V
UVP
UVP Detect, FBx Falling Edge 47 52 57 %
UVP Shutdown Blanking
Time
t
SHDN_UVP
From ENTRIPx Enable -- 1.6 -- ms
