RT2852BH
Parameter
Reference Voltage
Reference Voltage
V
REF
0A
I
LOAD
3A
R
OSC
= 37k
Switching Frequency
f
OSC
R
OSC
= 110k
R
OSC
= 270k
Switching Frequency Range
Minimum Sync Pulse Width
SYNC Threshold Voltage
SYNC Falling Edge to LX
Rising Edge Delay
Internal MOSFET
High-Side On-Resistance
Low-Side On-Resistance
LX and BOOT
Minimum On-Time
Minimum Off-Time
BOOTLX UVLO
Soft-Start and Tracking
Internal Charge Current
SS to Feedback Offset
Current Limit
High-Side Switch Current
Limit
Low-Side Switch Sourcing
Current Limit
Low-Side Switch Sinking
Current Limit
Error Amplifier
Error Amplifier
Trans-conductance
Error Amplifier DC Gain
Error Amplifier Sink/Source
Current
COMP to I
switch
gm
Power Good
Power Good Rising
Threshold
V
FB
rising (Good)
V
FB
rising (Fault)
--
--
94
109
--
--
%V
REF
gm
2A
< I
COMP
< 2A,
V
COMP
= 1V
V
FB
= 0.8V
V
COMP
= 1V, 100mV input
overdrive
--
1000
--
--
1300
3100
110
12
--
--
--
--
A/V
V/V
A
A/V
4.2
3.8
--
6.2
5.8
1.2
--
--
--
A
V
SS
= 0.4V
--
--
2
20
--
60
A
mV
t
ON_MIN
t
OFF_MIN
V
BL-UVLO
Measured at 90% to 90% of V
LX
,
I
LX
= 2A, 25°C
V
BOOT
V
LX
3V
--
--
--
--
0
--
135
--
3
V
ns
R
DS(ON)_H
R
DS(ON)_L
V
BOOT
V
LX
= 5.5V
V
IN
= 12V
--
--
46
36
60
50
m
High-Level
Low-Level
Measure at 500kHz with R
OSC
resistor in series
Include Sync mode and RT
mode set point
0.79
1080
400
160
200
--
--
0.8
--
0.8
1200
480
200
--
20
--
--
66
0.81
1320
560
240
1200
--
2
--
--
ns
V
ns
kHz
V
Timing Resistor and External Clock
Symbol
Test Conditions
Min
Typ
Max
Unit
Copyright
©
2019 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS2852BH-01
June
2019
www.richtek.com
5
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
