RT7274/79/80/81
Parameter
Output
Symbol
Test Conditions
Min
Typ
Max
Unit
V
PVCC
V
Output Voltage
V
6V ≤ V ≤ 18V, 0 < I
< 5mA
4.7
--
5.1
--
5.5
20
V
PVCC
PVCC
IN
PVCC
Line Regulation
Load Regulation
Output Current
6V ≤ V ≤ 18V, I
= 5mA
PVCC
mV
mV
mA
IN
0 < I
< 5mA
--
--
100
--
PVCC
I
V
= 6V, V = 4V
PVCC
--
110
PVCC
IN
R
DS(ON)
High Side
Low Side
R
--
--
150
105
--
--
DS(ON) _H
Switch On
Resistance
mΩ
R
DS(ON) _L
Current Limit
Current Limit
I
L
= 2μH
SW
2.5
3.5
4.7
A
LIM
Thermal Shutdown
Thermal Shutdown Threshold
Thermal Shutdown
Hysteresis
T
--
--
150
25
--
--
°C
°C
SD
ΔT
SD
On-Time Timer Control
On-Time
t
t
V
= 12V, V
= 1.05V
--
--
145
230
--
--
ns
ns
ON
OFF(MIN)
IN
OUT
Minimum Off-Time
Soft-Start
SS Charge Current
SS Discharge Current
UVLO
V
V
= 0V
1.4
2
2.6
--
μA
SS
= 0.5V
0.05
0.1
mA
SS
Wake up V
Hysteresis
3.55
--
3.85
0.3
4.15
--
PVCC
UVLO Threshold
V
Power Good (RT7279/80)
PGOOD Threshold
FB Rising
FB Falling
85
--
90
85
5
95
--
%
PGOOD Sink Current
PGOOD = 0.5V
--
--
mA
Output Under Voltage and Over Voltage Protection (RT7279/80)
OVP Trip Threshold
OVP Delay Time
OVP Detect
115
--
120
5
125
--
%
μs
UVP Detect
Hysteresis
65
--
70
75
--
UVP Trip Threshold
UVP Delay Time
%
10
--
250
--
μs
Note 1. Stresses beyond those listed “Absolute Maximum Ratings” may cause permanent damage to the device. These are
stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in
the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions may
affect device reliability.
Note 2. θJA is measured at TA = 25°C on a high effective thermal conductivity four-layer test board per JEDEC 51-7. θJC is
measured at the exposed pad of the package. The PCB copper area of exposed pad is 70mm2.
Note 3. Devices are ESD sensitive. Handling precaution is recommended.
Note 4. The device is not guaranteed to function outside its operating conditions.
Copyright 2013 Richtek Technology Corporation. All rights reserved.
©
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
10
DS7274/79/80/81-01 February 2013
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
