RT7275/76
4
DS7275/76-04 April 2017www.richtek.com
©
Copyright 2017 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation.
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. θ
JA
is measured at T
A
= 25°C on a high effective thermal conductivity four-layer test board per JEDEC 51-7. θ
JC
is
measured at the exposed pad of the package. The PCB copper area of exposed pad is 70mm
2
.
Note 3. Devices are ESD sensitive. Handling precaution is recommended.
Note 4. The device is not guaranteed to function outside its operating conditions.
Parameter Symbol Test Conditions Min Typ Max Unit
PVCC Load Regulation 0 I
PVCC
50mA -- -- 40 mV
Output Current I
PVCC
V
IN
= 6V, V
PVCC
= 4V -- 110 -- mA
On-Resistance (R
DS(ON)
)
Switch On
Resistance
High-Side R
DS(ON) _H
For WDFN-10L 3x3 -- 90 --
m
High-Side R
DS(ON) _H
For TSSOP-14 (Exposed Pad) -- 100 --
Low-Side R
DS(ON) _L
-- 60 --
High-Side Leakage V
IN
= 12V, V
EN
= 0V -- -- 1 A
Current Limit (upper threshold) I
LIM
L
SW
= 1.4H 3.5 4.5 5.7 A
Thermal Shutdown
Thermal Shutdown Threshold T
SD
-- 150 -- C
Thermal Shutdown Hysteresis T
SD
-- 20 -- C
On-Time and Off-Time Control
On-Time t
ON
V
IN
= 12V, V
OUT
= 1.05V -- 145 -- ns
Minimum On-Time t
ON(MIN)
-- 60 -- ns
Minimum Off-Time t
OFF(MIN)
-- 230 -- ns
Soft-Start
SS Charge Current V
SS
= 0V 1.4 2 2.6 A
SS Discharge Current V
SS
= 0.5V 0.05 0.1 -- mA
VIN UVLO
UVLO Threshold
V
VIN
/ V
VINR
rising, enable PVCC
regulator
3.55 3.85 4.15
V
Threshold hysteresis -- 0.3 --
Power Good
PGOOD Threshold
V
FB
rising 85 90 95
%
V
FB
falling -- 85 --
PGOOD Sink Current PGOOD = 0.5V -- 5 -- mA
Output Under-Voltage and Over-Voltage Protection
OVP Trip Threshold V
FB
rising 115 120 125 %
OVP Delay Time -- 5 -- s
UVP Trip Threshold
V
FB
falling 65 70 75
%
Hysteresis -- 10 --
UVP Delay Time -- 250 -- s
