RT9746
4
DS9746-00 March 2016www.richtek.com
©
Copyright 2016 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.
Note 3. Devices are ESD sensitive. Handling precaution is recommended.
Note 4. The device is not guaranteed to function outside its operating conditions.
Note 5. Guaranteed by design.
Parameter Symbol Test Conditions Min TYP Max Unit
OVP Hysteresis V
OVP_HYS
Falling -- 150 -- mV
OVP Propagation Delay to
Turn Off VBUSOUT
t
OVP_PD
V
BUS
= 5V to 10V, (6V/s) -- 0.18 0.25 s
OVP Recover Delay t
OVP_RD
V
BUS
= 10V to 5V -- 8 -- ms
OCP Threshold Current I
OCP
-- 4.5 5 A
OCP Blanking Time t
OCP_B
-- 180 -- s
OCP Recover delay t
OCP_RD
-- 64 -- ms
OTP Threshold to turn off
only for VBUS_OUT
T
OTP_FET
Rising (Note5) -- 160 -- °C
OTP Threshold Hysteresis
only for VBUS_OUT
T
OTP_FET_HYS
Falling (Note5) -- 20 -- °C
OTP Recover Delay t
OTD_RD
-- 8 -- ms
OCP Soft-Start Time tss -- 8 -- ms
FET On Resistance R
ON_FET
I
BUS_OUT
= 1000mA, V
BUS
= 5V
T
= 25°C
-- 35 42 m
External OVP Set
Threshold
V
REF_EXT
-- 1.2 -- V
External OVP Adjustment
Range
V
OVP_EXT
4 -- 20 V
External OVP Select
Threshold (Rising)
V
OVP_SEL
-- 0.3 -- V
External OVP Select
Threshold Hysteresis
-- 100 -- mV
WRNB Open-Drain
Impedance
V
BUS
= 5V -- -- 15
