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