RT6575A/B
Electrical Characteristics
(V
IN
= 12V, V
EN1
= V
EN2
= 3.3V, V
CS1
= V
CS2
= 2V, No Load, T
A
= 25°C, unless otherwise specified)
Parameter
Input Supply
VIN Power-On Reset
Symbol
Test Conditions
Rising Threshold
Falling Threshold
RT6575A Both Buck Controllers
Off, V
EN1
= V
EN2
= GND
RT6575B Both Buck Controllers
Off, V
EN1
= V
EN2
= GND
Both Buck Controllers On,
V
FBx
= 2.05V, V
BYP1
= 5.05V
Both Buck Controllers On,
V
FBx
= 2.05V, V
BYP1
= 5.05V
CCM Operation
V
BYP1
= 0.5V
V
PHASEx
= 0.5V
Min
--
3.2
--
--
--
--
Typ
4.6
3.7
60
80
15
420
Max
4.9
--
80
Unit
VIN
POR
V
VIN Standby Supply Current
I
VIN_SBY
A
100
25
500
A
A
VIN Quiescent Current
BYP1 Supply Current
I
VIN_nosw
I
BYP1_nosw
Buck Controllers Output and FB Voltage
FBx Valley Trip Voltage
BYP1 Discharge Current
PHASEx Discharge Current
Switching Frequency
Switching Frequency
Minimum Off-Time
Soft-Start
Soft-Start Time
Current Sense
CSx Source Current
CSx Current Temperature
Coefficient
Zero-Current Threshold
Internal Regulator
V
IN
= 12V, No Load
LDO5 Output Voltage
V
LDO5
V
IN
> 7V, I
LDO5
< 100mA
V
IN
> 5.5V, I
LDO5
< 35mA
V
IN
> 5V, I
LDO5
< 20mA
V
IN
= 12V, No Load
LDO3 Output Voltage
V
LDO3
V
IN
> 7V, I
LDO3
< 100mA
V
IN
> 5.5V, I
LDO3
< 35mA
V
IN
> 5V, I
LDO3
< 20mA
4.9
4.8
4.8
4.5
3.267
3.217
3.267
3.217
5
5
5
4.75
3.3
3.3
3.3
3.3
5.1
5.1
5.1
5.1
3.333
3.383
3.333
3.383
V
V
I
CSx
TC
ICSx
V
ZC
V
CSx
= 1V, V
FBx
= 1.9V
In Comparison with 25°C
V
FBx
= 2.05V, GND
PHASEx
9
--
--
10
4700
1
11
--
--
A
ppm/C
mV
t
SSx
V
OUT
Ramp-up Time
--
0.9
--
ms
f
SWx
t
OFF(MIN)
V
IN
= 20V, V
OUT1
= 5V
V
IN
= 20V, V
OUT2
= 3.33V
V
FBx
= 1.9V
240
280
--
300
355
200
360
430
275
kHz
ns
V
FBx
I
DCHG_BYP
1
1.98
10
5
2
45
8
2.02
--
--
V
mA
mA
I
DCHG_LX
Copyright
©
2016 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS6575A/B-03 February 2016
www.richtek.com
7
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