Swap Controller. RT1720 Datasheet

RT1720 Controller. Datasheet pdf. Equivalent

RT1720 Datasheet
Recommendation RT1720 Datasheet
Part RT1720
Description 60V Hot Swap Controller
Feature RT1720; RT1720 60V Hot Swap Controller with Fault Timer General Description The RT1720 is an over-voltage .
Manufacture Richtek
Datasheet
Download RT1720 Datasheet




Richtek RT1720
RT1720
60V Hot Swap Controller with Fault Timer
General Description
The RT1720 is an over-voltage and over-current
protection circuit. It monitors a circuit’s input voltage
and current with its adjustable over-voltage and
over-current thresholds and drives an external
N-MOSFET switch to connect the input to the output
voltage only when it is safe. Its wide input voltage
range makes it useful for high-voltage applications and
in systems that experience large transient voltages and
currents, such as automotive, telecom, and industrial
applications.
During over-voltage events, the RT1720 quickly
reduces the gate drive of the external MOSFET to
regulate the output voltage at the level chosen by its
external FB resistors. During over-current events, when
the load draws excessive current, the RT1720 reduces
the gate drive to regulate the output current at the level
set by its external current sense resistor. In both cases
the output voltage or current is linearly regulated,
thermally stressing the MOSFET load switch. However,
an externally-adjustable timer limits the duration of
MOSFET stress, eventually signaling a fault and then
turning off the MOSFET. The RT1720 then periodically
restarts operation to test if the fault has cleared. The
timer protects the MOSFET while allowing the load
circuit to temporarily operate normally through voltage
and current surges, such as load dump in automobiles
or spinning up disk drives.
The RT1720 features include, open-drain fault and
power-good outputs, and a shutdown input.
The RT1720 is available in the MSOP-10 package.
Features
Wide Input Operation Range : 5V to 80V
Negative Input Voltage Rating to −60V
Adjustable Output Clamp Voltage
Adjustable Over-Current Protection
Programmable Timer for Fault Protection
Low Shut Down Current
Internal Charge Pump N-MOSFET Drive
Fast 80mA MOSFET Shut-off for Overvoltage
Fault Output Indication
Applications
Automotive/Avionic Surge Protection
Hot Swap/Live Insertion
High-Side Switch for Battery Powered Systems
Intrinsic Safety Applications
Simplified Application Circuit
VIN
5V to 80V
RSNS
R3 VCC
SHDN
SNS
GATE
VOUT
RT1720
CTMR
FB
TMR
FLT
PGOOD
GND
Q1 VOUT
VOUT_Max = 60V
COUT
R2
FAULT
POWER
GOOD
R1
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
DS1720-01 November 2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1



Richtek RT1720
RT1720
Ordering Information
RT1720
Package Type
F : MSOP-10
Lead Plating System
G : Green (Halogen Free and Pb Free)
Marking Information
01=YM
DNN
01= : Product Code
YMDNN : Date Code
Note :
Richtek products are :
RoHS compliant and compatible with the current
requirements of IPC/JEDEC J-STD-020.
Suitable for use in SnPb or Pb-free soldering
processes.
Pin Configurations
(TOP VIEW)
FB
VOUT
GATE
SNS
VCC
2
3
4
5
10 TMR
9 GND
8 PGOOD
7 FLT
6 SHDN
MSOP-10
Functional Pin Description
Pin No.
Pin Name
Pin Function
1 FB
Voltage Regulator Feedback Input. Connect a resistive divider from output to FB to
GND to set the maximum output voltage and voltage regulation set-point.
2 VOUT
Output Voltage Connection. VOUT is the lower reference voltage for the GATE
charge pump.
3 GATE
N-MOSFET Gate Drive Output.
4 SNS
Current Sense Input. Connect a sense resistor from VCC to SNS to monitor the
current through the external N-MOSFET.
5 VCC
6 S̅̅̅H̅̅D̅̅N̅
7 F̅̅̅L̅̅T̅̅
Positive Supply Voltage Input.
Shutdown Control Input.
Open-Collector Fault Output.
8 PGOOD Open-Collector Power Good Indicator.
9 GND
Ground.
10 TMR
Fault Timer Input. Connect a capacitor from TMR to GND to program the maximum
time the part is allowed to remain in voltage regulation or current regulation mode.
TMR capacitor with value greater than 0.47F is recommended.
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS1720-01 November 2015



Richtek RT1720
Function Block Diagram
VCC SNS GATE
VOUT
50mV
+
-
Charge
Pump
+
- 1.25V
FB
FLT
VCC
28.5μA
3.5μA
Control Logic
1.4V -
+
+
1.2V -
-
0.5V +
PGOOD
SHDN
GND
TMR
RT1720
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
DS1720-01 November 2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
3







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