RT2856H
Parameter
Reference Voltage
Reference Voltage
Symbol
Test Conditions
Min
Typ
Max
Unit
VREF
0A ILOAD 6A
0.792
0.8
0.808
V
Timing Resistor and External Clock
ROSC = 27k
ROSC = 110k
1440
400
1600
480
1760
560
Switching Frequency
fOSC
kHz
R
OSC = 270k
160
200
240
Include Sync mode and RT
mode set point
Switching Frequency Range
Minimum Sync Pulse Width
200
--
1600
--
--
20
--
--
2
ns
V
High-Level
Low-Level
SYNC Threshold Voltage
0.8
--
--
SYNC Falling Edge to LX
Rising Edge Delay
Measure at 500kHz with ROSC
resistor in series
--
66
--
ns
Internal MOSFET
High-Side On-Resistance
Low-Side On-Resistance
LX and BOOT
RDS(ON)_H VBOOT VLX = 5.5V
--
--
26
19
40
30
m
RDS(ON)_L VIN = 12V
Measured at 90% to 90% of VLX,
LX = 2A, 25°C
Minimum On-Time
--
--
135
I
ns
V
Minimum Off-Time
BOOTLX UVLO
VBOOT VLX 3V
--
--
0
--
3
VBL-UVLO
--
Soft-Start and Tracking
Internal Charge Current
SS to Feedback Offset
Current Limit
--
--
2
--
A
VSS = 0.4V
20
60
mV
High-Side Switch Current
Limit
8
7
11
10
--
--
--
Low-Side Switch Sourcing
Current Limit
A
Low-Side Switch Sinking
Current Limit
--
2.3
Error Amplifier
Error Amplifier
Trans-conductance
2A < ICOMP < 2A,
VCOMP = 1V
gm
--
1300
--
A/V
Error Amplifier DC Gain
VFB = 0.8V
1000
--
3100
110
16
--
--
--
V/V
A
Error Amplifier Sink/Source
Current
VCOMP = 1V, 100mV input
overdrive
COMP to Iswitch gm
--
A/V
Power Good
VFB Rising (Good)
--
--
94
--
--
Power Good Rising
Threshold
%VREF
VFB Rising (Fault)
109
Copyright 2019 Richtek Technology Corporation. All rights reserved.
©
is a registered trademark of Richtek Technology Corporation.
DS2856H-07 June 2019
www.richtek.com
5
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
