UCC3916
SCSI Termpower Manager
FEATURES
DESCRIPTION
• Integrated Circuit Breaker Function
The UCC3916 SCSI termpower manager provides complete power management, hot swap capability, and circuit breaker functions with minimal external components. For most applications, the only external component
required to operate the device, other than supply bypassing, is a timing capacitor which sets the fault time.
• Integrated 0.2
Power FET
• SCSI, SCSI-2, SCSI-3 Compliant
• 1µA ICC When Disabled
The current trip level is internally set at 1.65A, and the maximum current
level is also internally programmed for 2A. While the output current is below
the trip level of 1.65A, the internal power MOSFET is switched on at a nominal 220mΩ. When the output current exceeds the trip level but remains
less than the maximum current level, the MOSFET remains switched on,
but the fault timer starts charging CT. Once the fault time is reached, the circuit will shut off for a time which equates to a 3% duty cycle. Finally, when
the output current reaches the maximum current level, the MOSFET transitions from a switch to a constant current source.
• Programmable On Time
• Accurate 1.65A Trip Current and
2.0A Max Current
• Fixed 3% Duty Cycle
• Uni-Directional Switch
• Thermal Shutdown
The UCC3916 is designed for uni-directional current flow, emulating a diode
in series with the power MOSFET.
The UCC3916 can be put in a sleep mode, drawing only 1µA of supply current.
Other features include thermal shutdown and low thermal resistance Small
Outline Power package.
BLOCK DIAGRAM
REVERSE VOLTAGE
COMPARATOR
1
VIN
4V TO 6V
8
OUTPUT
50mV
+
OUTPUT
CHARGE
PUMP
CURRENT SENSE
MAXIMUM
CURRENT
LEVEL
2A
H=OPEN
POWER
FET
LINEAR
CURRENT
AMPLIFIER
CURRENT
TRIP LEVEL
1.65A
ON TIME CONTROL
3% DUTY CYCLE
OVER CURRENT
COMPARATOR
THERMAL
SHUTDOWN
INTERNAL
BIAS
2
3
6
7
4
GND GND GND GND CT
4 HEATSINK PINS
SLUS206A - JANUARY 2000
1.5V
+
–
5
SHTDWN
UDG-99172
UCC3916
ABSOLUTE MAXIMUM RATINGS
CONNECTION DIAGRAM
VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +6V
Output Current
DC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Self Limiting
Pulse (Less than 100ns). . . . . . . . . . . . . . . . . . . . . . . . . 20A
Storage Temperature . . . . . . . . . . . . . . . . . . . –65°C to +150°C
Junction Temperature . . . . . . . . . . . . . . . . . . . –55°C to +150°C
Lead Temperature (Soldering, 10 sec.) . . . . . . . . . . . . . +300°C
SOIC-8 (Top View)
DP Package
Currents are positive into, negative out of the specified terminal. Consult Packaging Section of Databook for thermal limitations and considerations of packages.
ELECTRICAL CHARACTERISTICS: Unless otherwise stated, these parameters apply for TJ = 0°C to +70°C; VIN = 5V,
SHTDWN = 2.4V, TA = TJ.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX UNITS
1.00
2.00
mA
SHTDWN = 0.2V
0.50
5
µA
IOUT = 1A
0.22
0.33
V
IOUT = 1.5A
0.33
0.50
V
Supply Current Section
ICC
ICC - Sleep Mode
Output Section
Voltage Drop
IOUT = 1.65A
Trip Current
Max Current
Reverse Leakage
0.40
0.60
V
–1.8
–1.65
–1.5
A
–2.4
–2
–1.65
A
6
20
µA
0.50
9
µA
VIN = 4.5V, VOUT = 5V
VIN = 0V, VOUT = 5V
Soft Start Time
Initial Startup
Short Circuit Response
50
µs
100
ns
Fault Section
CT Charge Current
VCT = 1.0V
–45
–36.0
–27
µA
CT Discharge Current
VCT = 1.0V
0.90
1.0
1.50
µA
Output Duty Cycle
VOUT = 0V
2.00
3.00
6.00
%
CT Charge Threshold
0.4
0.5
0.6
V
CT Discharge Threshold
1.2
1.4
1.8
V
Thermal Shutdown
170
°C
Thermal Hysteresis
10
°C
Shutdown Section
Shutdown Threshold
1.5
3.0
V
Shutdown Hysteresis
150
300
mV
100
500
nA
Shutdown Bias Current
SHTDWN = 1.0V
Note 1: All voltages are with respect to ground.
2
UCC3916
PIN DESCRIPTIONS
CT: A capacitor is applied between this pin and ground to
set the maximum fault time. The maximum fault time
must be more than the time to charge external capacitance. The maximum fault time is defined as:
SHTDWN: The IC enters a low-power sleep mode when
this pin is low and exits the sleep mode when this pin is
high.
VIN: Input voltage to the circuit breaker, ranging from 4V
to 6V.
TFAULT= 28 • 103 • CT.
Once the fault time is reached the output will shutdown
for a time given by:
VOUT: Output voltage of the circuit breaker. When
switched, the output voltage is approximately:
TSD = 1 • 106 • CT
VOUT = VIN – (220mΩ) • IOUT.
this results in a 3% duty cycle. 0.1µF is recommended
for SCSI applications to achieve the normal maximum
capacitance on the Termpwr line.
TYPICAL APPLICATION
VIN
D1
CIN
1
VIN
5
SHTDWN
UCC3916
OUTPUT
8
CT
4
TERMPOWER
BUS
CLOAD
GND
GND
GND
GND
2
3
6
7
CT
UDG-99169
APPLICATION INFORMATION
Protecting The UCC3916 From Voltage Transients
SAFETY RECOMMENDATIONS
The parasitic inductance associated with the power distribution can cause a voltage spike at VIN if the load current is suddenly interrupted by the UCC3916. It is
important to limit the peak of this spike to less than 6V to
prevent damage to the UCC3916. This voltage spike can
be minimized by:
Although the UCC3916 is designed to provide system
protection for all fault conditions, all integrated circuits
can ultimately fail short. For this reason, if the UCC3916
is intended for use in safety critical applications where
©
UL or some other safety rating is required, a redundant
safety device such as a fuse should be placed in series
with the device. The UCC3916 will prevent the fuse from
blowing virtually all fault conditions, increasing system
reliability and reducing maintainence cost, in addition to
providing the hot swap benefits of the device.
• Reducing the power distribution inductance (e.g., twist
the positive (+) and negative (–) leads of the power
supply feeding VIN pin, locate the power supply close
to the UCC3916 or use a PCB ground plane).
• Decoupling VIN with a capacitor, CIN, located close to
the VIN. This capacitor is typically less than 1µF to limit
the inrush current.
• Clamping the voltage at VIN below 6V with a Zener
diode, D1, located close to the VIN pin.
UNITRODE CORPORATION
7 CONTINENTAL BLVD. • MERRIMACK, NH 03054
TEL. (603) 424-2410 FAX (603) 424-3460
3
PACKAGE OPTION ADDENDUM
www.ti.com
13-Jul-2022
PACKAGING INFORMATION
Orderable Device
Status
(1)
Package Type Package Pins Package
Drawing
Qty
Eco Plan
(2)
Lead finish/
Ball material
MSL Peak Temp
Op Temp (°C)
Device Marking
(3)
Samples
(4/5)
(6)
UCC3916DP
ACTIVE
SOIC
D
8
75
RoHS & Green
NIPDAU
Level-2-260C-1 YEAR
0 to 70
UCC3916
Samples
UCC3916DPTR
ACTIVE
SOIC
D
8
2500
RoHS & Green
NIPDAU
Level-2-260C-1 YEAR
0 to 70
UCC3916
Samples
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance
do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may
reference these types of products as "Pb-Free".
RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.
Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of
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