RT7273
Parameter
PVCC Under-Voltage Lockout
Deglitch
Enable Input
Voltage
ENx Pull-Up Current
Soft-Start Current Source
Converter Switching Frequency
Range
Frequency Setting Resistor
Internal Oscillator Accuracy
SYNC External
Clock Input Voltage
Logic-High
Logic-Low
Logic-High
Logic-Low
V
EN_H
V
EN_L
I
EN
I
SS
f
SW
R
OSC
f
SW_TOL
V
SYNC_H
V
SYNC_L
f
SW_SYNC
f
SW
= 800kHz
Symbol
Test Conditions
Min
--
Typ
100
Max
--
Unit
s
Enable Circuit, Soft-Start, Sync Circuit, Low Power Mode and Switching Frequency
1.6
--
--
--
0.3
50
10
1.6
--
0.2
10
--
V
LOWP_H
V
LOWP_L
1.6
--
0.792
4.5V
V
IN
18V
0.784
--
--
--
--
--
--
--
--
2
2
--
--
1.5
6
--
--
--
--
--
--
--
--
--
--
0.8
0.8
100
100
95
50
120
80
120
80
--
--
--
1.2
--
--
2.2
600
10
--
1.2
2.2
--
90
--
1.2
0.808
0.816
--
--
--
--
--
--
--
--
6
5
V
A
A
MHz
k
%
V
MHz
%
%
V
Synchronization Range
SYNC Signal Minimum Duty
Cycle
SYNC Signal Maximum Duty
Cycle
Low Power Mode
Input Voltage
Feedback
Feedback Reference Voltage
Minimum On-Time
Minimum Off-Time
CH 1 On-Resistance
Switch On-Resistance
CH 2 On-Resistance
Switch On-Resistance
CH 3 On-Resistance
Switch On-Resistance
Current Limit
Current Limit CH 1
Current Limit CH 2, CH 3 Range
Logic-High
Logic-Low
V
REF
t
ON(MIN)
t
OFF(MIN)
R
DS(ON)1_H
R
DS(ON)1_L
R
DS(ON)2_H
R
DS(ON)2_L
R
DS(ON)3_H
R
DS(ON)3_L
I
OC_CH1
I
OC_CH2,
CH3_Range
V
ns
ns
m
m
m
A
A
Copyright
©
2014 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS7273-04
October 2014
www.richtek.com
7
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
