SC4150 Datasheet PDF - Semtech

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SC4150
Semtech

Part Number SC4150
Description Negative Voltage Hot Swap Controller
Page 12 Pages


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POWER MANAGEMENT
Description
The SC4150 is a negative voltage hotswap controller that
allows the insertion of line cards into a live backplane.
The inrush current is programmable and closed loop op-
eration limits the maximum current even under short cir-
cuit conditions. A built in timing circuit prevents false shut-
down. The signal from the drain voltage is fed to the
timer, providing safety for the MOSFET when in linear
mode. The SC4150 latches off under abnormal condi-
tion and attempts to restart after a time out period.
The device comes in two options, PWRGD (SC4150H)
and PWRGD (SC4150L). These signals can be directly
used to enable power modules.
Typical Application Circuit
SC4150
Negative Voltage
Hot Swap Controller
Features
‹ Programmable slew of the inrush current when
used for hot insertion in the negative 24V and 48V
backplane
‹ Closed loop operation limits the maximum current
even in short circuit condition
‹ Built in timer prevents false shutdown, when the
closed loop operation limits the current.
‹ Sensing the drain voltage allows for immediate
shutdown in short circuit condition, where current
spikes and noise is ignored.
‹ Power good signal
‹ Input UVLO and OVLO sensing
‹ SO-8 package
Applications
‹ Central office switching
‹ -48V Distributed power systems
‹ Power supply hotswap & inrush control
GND
PWRGD/PWRGD
GND(remote)
R1
562k
R2
9.31k
R3
10.2k
-- 48V
U1
SC4150
1 PWRGD /PWRGD
VCC 8
2 OV
DRAIN
7
3 UV
GATE
6
4 VEE
SENSE
5
C1
0.1
VVeEeE
R6 C4
18k 3.3nF
C2
0.001
R4
0.01
C3
0.33
R5
10
Q1
C5
150
Figure 1
Revision: April 14, 2004
1
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SC4150
POWER MANAGEMENT
Absolute Maximum Ratings
Exceeding the specifications below may result in permanent damage to the device, or device malfunction. Operation outside of the parameters
specified in the Electrical Characteristics section is not implied.
Parameter
Symbol
Maximum
Units
Supply Voltage
DRAIN, PWRGD/ PWRGD
VCC
-0.3 to 100
V
-0.3 to 100
V
SENSE, GATE
-0.3 to 20
V
UV, OV
-0.3 to 60
V
Thermal Resistance Junction to Ambient
Thermal Resistance Junction to Case
Operating Junction Temperature Range
Storage Temperature Range
Lead Temperature (Soldering) 10 sec
Electrical Characteristics
Unless specified: TA = 25°C, VCC = 48V, VEE = 0V.
Values in bold apply over full operating temperature range.
Parameter
Symbol
θJA
θJC
TJ
TSTG
TLEAD
Test Conditions
163
38.8
-40 to 125
-65 to 150
300
°C
°C
°C
°C
°C
Min Typ Max Units
DC Characteristics
Supply Operating Range
Supply Current
Circuit Breaker Trip Voltage
Gate Pin Pull-up Current
Gate Pin Pull-down Current
Sense Pin Current
External Gate Drive
VCC
ICC
VCB
IPU
IPD
ISENSE
VGATE
UV Pin High Threshold Voltage
UV Pin Low Threshold Voltage
UV Pin Hystersis
UV Pin Input Current
OV Pin High Threshold Voltage
OV Pin Low Threshold Voltage
OV Pin Hystersis
OV Pin Input Current
2004 Semtech Corp.
VUVH
VUVL
VUVHY
IINUV
VOVH
VOVL
VOVHY
IINOV
UV = 3V, 0V = VEE, SENSE = VEE
VCB = (VSENSE - VEE)
Gate drive ON, VGATE = VEE
Any fault condition
VSENSE = 50mV
(VGATE -VEE), 20V < VDD 80V
(VGATE -VEE), 10V VDD 20V
UV Low to High transition
UV High to Low transition
VUV = VEE
OV Low to High transition
OV High to Low transition
VOV 1.5V
2
10 80 V
4 7 mA
50 60 70 mV
-50
40
-0.05
9 13 16
8
1.241 1.273 1.305
µA
mA
µA
V
V
1.192 1.223 1.253
50
-0.1
V
mV
µA
1.192 1.223 1.253
1.153 1.188 1.223
35
V
V
mV
-0.05
µA
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SC4150
POWER MANAGEMENT
Electrical Characteristics (Cont.)
Unless specified: TA = 25°C, VCC = 48V, VEE = 0V.
Values in bold apply over full operating temperature range.
Parameter
Symbol
Test Conditions
Min Typ Max Units
Power Good Threshold
Power Good Threshold Hysteresis
Drain Input Bias Current
Output Low Voltage
Output Leakage
AC Characteristics
VPG
VPGHY
IDRAIN
VOL
IOH
VDRAIN - VEE, High to Low transition
1.5 1.75 2.0
0.4
VDRAIN = 48V
SC4@150VHD,RAVINO=L =5VP,WIOR=GD1m-AVDRAIN
SC4@15V0DLR,AINV=OL1=V,PWIO R=G1DmA- VEE
SC4150H, VDRAIN -VEE = 1V, VPWRGD = 80V
SC4150L, VDRAIN -VEE = 5V
15 50
1
1
1.0 10
1.0 10
V
V
µA
V
V
µA
µA
OV High to Gate Low
UV Low to Gate Low
OV Low to Gate High
UV Low to Gate High
SENSE High to Gate Low
DRAIN Low to PWRGD Low
DRAIN Low to (PWRGD - DRAIN)
High
tPHLOV
tPHLUV
tPLHOV
tPLHUV
tPHLSENSE
tPHLPG
1.7 µs
1.5 µs
5.5 µs
6.5 µs
3 µs
µs
0.5
DRAIN High to PWRGD High
DRAIN High to (PWRGD - DRAIN)
Low
tPLHPG
0.5 µs
Gate ON Time - Time Delay
Gate ON Time - Time Delay
Gate OFF Time
tON_1
VDRAIN > 8V, after short circuit
tON_2 VDRAIN < 7V, after short circuit
tOFF SC4150, After short, prior to retry
SC4150-4, After short, prior to retry
Note:
(1) This device is ESD sensitive. Use of standard ESD handling precaution is required.
5 µs
250 µs
100 ms
400
2004 Semtech Corp.
3
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SC4150
POWER MANAGEMENT
Pin Configuration
TOP VIEW
PWRGD/PWRGD
OV
UV
VEE
1
2
3
4
8
7
6
5
(SO-8)
VCC
DRAIN
GATE
SENSE
Ordering Information
Part Number(1)(2)(3)
Package
SC4150HISTRT
SC4150LISTRT
SO-8
SC4150HIS-4TRT
SC4150LIS-4TRT
Notes:
(1) Only available in tape and reel packaging. A reel
contains 2500 devices.
(2) Device marking:
SC4150H, SC4150L - 100ms
4150H-4, 4150L-4 - 400ms
(3) Lead free product.
Pin Descriptions
Pin
Pin Name
Pin Function
1
PWRGD/PWRGD
Power Good output pin.
be connected directly to
This pin will toggle
the enable pin of a
wphoewneVr mDRoAIdN uislew, 0it.h1inµFVPtoG
VofEVEEEis.
This pin can
optional.
2 OV Analog Overvoltage input. When OV is pulled above 1.223V threshold, an overvoltage
condition is detected and the GATE pin will be immediately pulled low. The GATE pin will
remain low until OV drops below the 1.188V high to low threshold.
3 UV Analog Undervoltage input. When UV is pulled below the 1.223V threshold, an
undervoltage condition is detected and the GATE pin will be immediately pulled low. The
GATE pin will remain low until UV rises above the 1.273 threshold.
4
VEE
Negative supply voltage input. Connect to the lower potential of the power supply.
5
SENSE
Circuit breaker sense pin. With a sense
and SENSE, the circuit breaker will trip
wrehseinsttohrepvlaocltaegdeinatchreosssupthpelyrpeasitshtobreetwxeceeendVsEE
60mV. Noise spikes of less than 2µs are filtered out and will not trip the circuit breaker. If
the circuit breaker trip current is set to twice the normal operating current, only 25mV is
dropped across the sense resistor during normal operation. To disable the circuit breaker,
VEE and SENSE can be shorted together.
6
GATE
Gate drive output for external n-channel. The GATE pin will go high when the following
start-up
60mV.
conditions
The GATE
are
pin
met: the
is pulled
UV pin
high by
is
a
high, t he OV
50µA current
spoinuricseloawndanpdull(eVdSEloNSwE
w- VithEEa)
<
40mA
current source.
7
DRAIN
Analog Drain sense input. Connect this pin to the drain of the external N-channel FET and
the V(-) pin of the power module.
PWRGD pin will toggle.
When the DRAIN pin is below VPG, the PWRGD or
8
VCC
Positive supply voltage input. Connect this pin to the higher potential of the power supply
input and the V(+) pin of the power module.
2004 Semtech Corp.
4
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