RT7299B
Parameter
Reference Voltage
Reference Voltage
Symbol
Test Conditions
Min
Typ
Max
Unit
VREF
0A ILOAD 8A
0.594
0.6
0.606
V
Timing Resistor and External Clock
ROSC = 27k
ROSC = 110k
ROSC = 270k
1440
400
1600
480
1760
560
Switching Frequency
fOSC
kHz
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
--
--
m
RDS(ON)_L VIN = 12V
Measured at 90% to 90% of
VLX, ILX = 2A
Minimum On-Time
--
--
135
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
10.5
14.5
17
Low-Side Switch Sourcing
Current Limit
A
9.5
--
11.5
3
15
--
Low-Side Switch Sinking
Current Limit
Error Amplifier
Error Amplifier
Trans-conductance
2A < ICOMP < 2A,
VCOMP = 1V
gm
--
1300
--
A/V
Error Amplifier DC Gain
VFB = 0.6V
--
--
--
3100
110
19.5
--
--
--
V/V
A
Error Amplifier Sink/Source
Current
VCOMP = 1V, 100mV input
overdrive
COMP to Iswitch gm
A/V
Power Good
VFB Rising (Good)
VFB Rising (Fault)
--
--
94
--
--
Power Good Rising
Threshold
%VREF
109
Copyright 2019 Richtek Technology Corporation. All rights reserved.
©
is a registered trademark of Richtek Technology Corporation.
DS7299B-05 June 2019
www.richtek.com
5
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