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HV300LG-G

Description
Hot Swap Voltage Controllers Active High
CategoryPower/power management    The power supply circuit   
File Size662KB,7 Pages
ManufacturerMicrochip
Websitehttps://www.microchip.com
Environmental Compliance
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HV300LG-G Overview

Hot Swap Voltage Controllers Active High

HV300LG-G Parametric

Parameter NameAttribute value
Is it Rohs certified?conform to
MakerMicrochip
package instructionSOIC-8
Reach Compliance Codeunknown
ECCN codeEAR99
Factory Lead Time13 weeks
Other featuresIT OPERATES FROM A -10V TO -90V SUPPLY
Analog Integrated Circuits - Other TypesPOWER SUPPLY SUPPORT CIRCUIT
JESD-30 codeR-PDSO-G8
JESD-609 codee3
length4.9 mm
Humidity sensitivity level3
Nominal Negative Supply Voltage (Vsup)-48 V
Number of channels1
Number of functions1
Number of terminals8
Maximum operating temperature85 °C
Minimum operating temperature-40 °C
Package body materialPLASTIC/EPOXY
encapsulated codeSOP
Encapsulate equivalent codeSOP8,.25
Package shapeRECTANGULAR
Package formSMALL OUTLINE
Peak Reflow Temperature (Celsius)260
Maximum seat height1.75 mm
Maximum supply current (Isup)0.65 mA
surface mountYES
technologyCMOS
Temperature levelINDUSTRIAL
Terminal surfaceMatte Tin (Sn)
Terminal formGULL WING
Terminal pitch1.27 mm
Terminal locationDUAL
Maximum time at peak reflow temperature40
width3.9 mm
HV300
Hotswap, Inrush Current Limiter Controllers
(Negative Supply Rail)
Features
PWRGD = Active HIGH
-10V to -90V input voltage range
Few external components
0.33mA typical standby supply current
Programmable over/under voltage limits with
hysteresis
Programmable current limit
Active control during all phases of start-up
Programmable timing
8-Lead SOIC package
General Description
The Supertex HV300, Hotswap Controller, Negative Supply controls the power
supply connection during insertion of cards or modules into live backplanes.
It may be used in traditional ‘negative 48V’ powered systems or for higher
voltage busses up to negative 90V.
Operation during the initial power up prevents turn-on glitches, and after
complete charging of load capacitors (typically found in filters at the input
of DC-DC converters) the HV300 issues a power good signal. This signal is
typically used to enable the DC-DC converter. Once a PWRGD signal has
been established, the device sleeps in a low power state, important for large
systems with many individual hotswap cards or modules.
An external power MOSFET is required as the pass element, plus a ramp
capacitor, and resistors to establish current limiting and over and under voltage
lockouts. There is no need for additional external snubber components.
Features are programmable over voltage and under voltage detection of the
input voltage which locks out the load connection if the bus (input) voltage
is out of range. An internal voltage regulator creates a stable reference,
and maintains accurate gate drive voltage. The unique control loop scheme
provides full current control and limiting during start up.
Applications
Central office switching
Servers
POTS line cards
ISDN line cards
xDSL line cards
PBX Systems
Powered Ethernet for VoIP
Distributed power systems
Negative power supply control
Antenna and fixed wireless systems
Theory of Operation
Initially the external N-channel MOSFET is held off by the gate signal,
preventing an input glitch. After a delay (while internal circuits are activated)
the inrush current to the load is limited by the gate control output. The current
may ramp up and limit at a maximum value programmed by an external
resistor. Initial time delay, to allow for contact bounce, and charging operation
is determined by the single external ramp capacitor connected to the RAMP
pin. When the load capacitor is fully charged, the controller emerges from
current limit mode, an additional time delay occurs before the external N-
channel MOSFET pass transistor is switched to full conduction, and the
PWRGD output signal is activated. The controller will then transition to a low
power standby mode.
Typical Application Circuit
GND
Long Pin
Jumper
8
GND
Short Pin
VDD
PWRGD
R1
487kΩ
R2
6.81kΩ
R3
9.76kΩ
1
ENABLE
3
UV
HV300
+5V
2
C
LOAD
OV
RAMP
DC/DC
PWM
CONVERTER
COM
VEE
4
SENSE
5
GATE
6
-48V
Long Pin
C1
10nF
7
NOTES:
1. Undervoltage Shutdown (UV) set to 35V.
2. Overvoltage Shutdown (OV) set to 65V.
3. Remove jumper if short pin is used.
R4
50mΩ
Q1
IRF530
1235 Bordeaux Drive, Sunnyvale, CA 94089
Tel: 408-222-8888
www.supertex.com

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