Texas Instruments UCC3916DP, UCC3916DPTR Datasheet

UCC3916

SLUS206A - JANUARY 2000

FEATURES

•

Integrated Circuit Breaker Function

•

Integrated 0.2

Power FET

•

SCSI, SCSI-2, SCSI-3 Compliant

•

1µA ICC When Disabled

•

Programmable On Time

•

Accurate 1.65A Trip Current and

2.0A Max Current

•

Fixed 3% Duty Cycle

•

Uni-Directional Switch

•

Thermal Shutdown

DESCRIPTION

The UCC3916 SCSI termpower manager provides complete power man

-

agement, hot swap capability, and circuit breaker functions with minimal ex

­ternal components. For most applications, the only external component
required to operate the device, other than supply bypassing, is a timing ca

­pacitor which sets the fault time.

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 nom

­inal 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 cir

­cuit 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 transi

­tions from a switch to a constant current source.

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.

SCSI Termpower Manager

8 OUTPUT

+

OUTPUT

CURRENT SENSE

H=OPEN

REVERSE VOLTAGE
COMPARATOR

50mV

CHARGE

PUMP

POWER
FET

ON TIME CONTROL

3% DUTY CYCLE

LINEAR
CURRENT
AMPLIFIER

THERMAL

SHUTDOWN

INTERNAL

BIAS

+
–

1.5V

5

SHTDWN

4

CT

OVER CURRENT
COMPARATOR

2 3 6 7

GNDGNDGNDGND

MAXIMUM
CURRENT
LEVEL
2A

4 HEATSINK PINS

CURRENT
TRIP LEVEL

1.65A

1

VIN
4V TO 6V

BLOCK DIAGRAM

UDG-99172

2

UCC3916

ABSOLUTE MAXIMUM RATINGS

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

Currents are positive into, negative out of the specified termi

-

nal. Consult Packaging Section of Databook for thermal limita

-

tions and considerations of packages.

CONNECTION DIAGRAM

SOIC-8 (Top View)
DP Package

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

Supply Current Section

ICC 1.00 2.00 mA
ICC - Sleep Mode SHTDWN

= 0.2V 0.50 5 µA

Output Section

Voltage Drop I

OUT = 1A 0.22 0.33 V

I

OUT = 1.5A 0.33 0.50 V

I

OUT = 1.65A 0.40 0.60 V

Trip Current –1.8 –1.65 –1.5 A
Max Current –2.4 –2 –1.65 A
Reverse Leakage VIN = 4.5V, V

OUT = 5V 6 20 µA

VIN = 0V, V

OUT = 5V 0.50 9 µA

Soft Start Time Initial Startup 50 µs
Short Circuit Response 100 ns

Fault Section

CT Charge Current V

CT = 1.0V –45 –36.0 –27 µA

CT Discharge Current V

CT = 1.0V 0.90 1.0 1.50 µA

Output Duty Cycle V

OUT = 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
Shutdown Bias Current SHTDWN

= 1.0V 100 500 nA

Note 1: All voltages are with respect to ground.