VBUS OVP. RT9746 Datasheet

RT9746 OVP. Datasheet pdf. Equivalent

RT9746 Datasheet
Recommendation RT9746 Datasheet
Part RT9746
Description VBUS OVP
Feature RT9746; ® RT9746 VBUS OVP with a PTVS Diode General Description The RT9746 is an overvoltage protection de.
Manufacture Richtek
Datasheet
Download RT9746 Datasheet




Richtek RT9746
®
RT9746
VBUS OVP with a PTVS Diode
General Description
The RT9746 is an overvoltage protection devices feature a
low 35mΩ (typ) RON internal FET with PTVS diode. The
PTVS also protects the devices from surges up to 100V.
When the input voltage exceeds the overvoltage threshold,
the internal FET is turned off to prevent damage to the
protected down stream components.
The internal Over Voltage Thresholds (OVP) are preset to
6.8V typical. The RT9746 also feature an over-current
protection and up to 4.5A.
The RT9746 is offered in a small WL-CSP-12B (BSC)
package provides small PCB area applications.
Ordering Information
RT9746
Package Type
WSC : WL-CSP-12B 1.92x1.27
OVP Threshold Option
Default : 6.8V
A : 11.5V
B : 14.5V
C : 6.2V
Note :
Richtek products are :
RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
Suitable for use in SnPb or Pb-free soldering processes.
Features
PTVS Diode Embedded for VBUS Surge Protection
Warning Indicator for OVP or UVP
28V Maximum Rating for DC Adapter
Integrated Over-Voltage and Over Current
Protection FET on VBUS for Fault Isolation
Applications
Cellular Phone
Smart Handheld Device
Pin Configurations
(TOP VIEW)
A1 A2
GND VOUT
B1 B2
WRNB VOUT
C1 C2
OVPFB VIN
A3
VOUT
B3
VIN
C3
VIN
A4
GND_
PTVS
B4
GND_
PTVS
C4
GND_
PTVS
WL-CSP-12B 1.92x1.27 (BSC)
Marking Information
RT9746WSC
3C : Product Code
3CW
W : Date Code
Simplified Application Circuit
Adaptor
CIN
R2
R1
RT9746
VIN VOUT
OVPFB
WRNB
GND_PTVS GND
VDDIO
R3
Charger
COUT
Processor
Copyright ©2016 Richtek Technology Corporation. All rights reserved.
DS9746-00 March 2016
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1



Richtek RT9746
RT9746
Functional Pin Description
Pin No
A1
A2, A3, B2
B1
A4, B4, C4
B3, C2, C3
C1
Pin Name
GND
VOUT
WRNB
GND_PTVS
VIN
OVPFB
Pin Function
Common Ground Of Internal Circuits.
Output from VBUS Load-Switch.
Inverse Warning Signal (OCP,OTP, OVP, UVLO) Flag Output (Open-Drain).
Common Ground of Power TVS Diode.
VBUS from Power Adaptor.
External OVP Adjustment Setting. (if no used, be surely tied to GND)
Function Block Diagram
VOUT
GND
Power
FET
OCP
OTP
UVLO
OVPFB
OVP
SEL
External
& Internal
OVP
Digital
Control
Pre-
Regulator
POR
I/O Buffer
VIN
GND_PTVS
WRNB
Operation
The RT9746 is a VBUS OVP protector switch. The OVP function is optimized to protect low voltage system from
abnormal high input voltage (up to 28V) in handheld application. RT9746 is also embedded Power-TVS diode (PTVS) on
VBUS pin for surge protection. If surge waveform is above 30V, it will be clamped to 30V due to PTVS diode. When
plugging in VBUS, the OCP will be soft-start in 8ms in order to reduce in rush current and internal VOUT deglitch time
is 16/32/64/128ms which is set by fuse. The OCP after soft-start is up to 4.5A for high current application.
Copyright ©2016 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS9746-00 March 2016



Richtek RT9746
RT9746
Absolute Maximum Ratings (Note 1)
VIN, OVPFB ---------------------------------------------------------------------------------------------------------------- 0.3V to 28V
VOUT ------------------------------------------------------------------------------------------------------------------------- 0.3V to 15V
System Level with Air Discharger, VIN, GND ----------------------------------------------------------------------- ±15kV
System Level with Contact Discharger, VIN, GND ----------------------------------------------------------------- ±8kV
All Other Inputs ------------------------------------------------------------------------------------------------------------ 0.3V to 6V
Power Dissipation, PD @ TA = 25°C
WL-CSP-12B 1.92x1.27 (BSC) ---------------------------------------------------------------------------------------- 1.67W
Package Thermal Resistance (Note 2)
WL-CSP-12B 1.92x1.27 (BSC), θJA ---------------------------------------------------------------------------------- 59.6°C/W
Junction Temperature ----------------------------------------------------------------------------------------------------- 150°C
Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------------- 260°C
Storage Temperature Range -------------------------------------------------------------------------------------------- 65°C to 150°C
ESD Susceptibility (Note 3)
HBM (Human Body Model) ---------------------------------------------------------------------------------------------- 2kV
MM (Machine Model) ----------------------------------------------------------------------------------------------------- 200V
CDM (Charged Device Model) ------------------------------------------------------------------------------------------ 2kV
Surge (VIN) ----------------------------------------------------------------------------------------------------------------- 100V
Recommended Operating Conditions (Note 4)
USB Supply Input Voltage, VIN ---------------------------------------------------------------------------------------- 3V to 6.7V
I/O Supply Voltage (VDDIO) ---------------------------------------------------------------------------------------------- 1.8V to 3.6V
VOUT Capacitors ---------------------------------------------------------------------------------------------------------- 1μF to 10μF
Junction Temperature Range -------------------------------------------------------------------------------------------- 40°C to 125°C
Ambient Temperature Range -------------------------------------------------------------------------------------------- 40°C to 85°C
Electrical Characteristics
(VIN = 5V, TA = 25°C, unless otherwise specified)
Parameter
Symbol
Test Conditions
DC Characteristics
Input Clamp Voltage
VIN Supply Current
VIN POR Threshold
Only for VOUT
VBUS POR Hysteresis
Only for VOUT
Deglitch Time of POR
Only for VOUT
VIN_CLAMP
IVBUS_S
VPOR
VPOR_Hys
tPOR
IIN = 10mA, TA = 25°C
VBUS = 5V, IOUT = 0mA
Rising
Falling
by EFUSE setting
(16/32/64/128ms)
RT9746
OVP Threshold Voltage VOVP
Rising
RT9746A
RT9746B
RT9746C
Min TYP Max Unit
-- 31 -- V
-- 130 180 A
2.5 2.7 2.9
V
-- 100 -- mV
-- 32 --
6.6 6.8
7
11.15 11.5 11.85
14 14.5 15
6 6.2 6.4
ms
V
Copyright ©2016 Richtek Technology Corporation. All rights reserved.
DS9746-00 March 2016
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
3







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