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UC2914 Datasheet Preview

UC2914 Datasheet

Power Manager

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UC2914
UC3914
ą
SLUS425C − DECEMBER 2003 − REVISED JULY 2004
5ĆV to 35ĆV HOT SWAP
POWER MANAGER
FEATURES
D 5-V to 35-V Operation
D Precision Maximum Current Control
D Precision Fault Threshold
D Programmable Average Power Limiting
D Programmable Overcurrent Limit
D Shutdown Control
D Charge Pump for Low RDS(on) High-Side
Drive
D Latch Reset Function Available
D Output Drive VGS Clamping
D Fault Output Indication
D 18-Pin DIL and SOIC Packages
SIMPLIFIED APPLICATION DIAGRAM
6 9 18
OSC PMP REF
1 PMPB
16
IMAX
VCC 2
UC2914/UC3914
5 OSCB
SENSE 17
7 VPUMP
4 SD
VOUT
10
FAULT
GND
1
OUT 11
VOUTS 12
PLIM 14
LR CT
13 15
VCC
DESCRIPTION
The UC3914 family of hot swap power managers
provides complete power management, hot swap
and fault handling capability. Integrating this part
and a few external components, allows a board to
be swapped in or out upon failure or system
modification without removing power to the
hardware, while maintaining the integrity of the
powered system. Complementary output drivers
and diodes have been integrated for use with
external capacitors as a charge pump to ensure
sufficient gate drive to the external N-channel
MOSFET transistor for low RDS(on). All control and
housekeeping functions are integrated and
externally programmable and include the fault
current level, maximum output sourcing current,
maximum fault time and average power limiting of
the external FET. The UC3914 features a duty
ratio current limiting technique, which provides
peak load capability while limiting the average
power dissipation of the external pass transistor
during fault conditions. The fault level is fixed at
50 mV with respect to VCC to minimize total
dropout.
The fault current level is set with an external
current sense resistor. The maximum allowable
sourcing current is programmed by using a
resistor divider from VCC to REF to set the voltage
on IMAX. The maximum current level, when the
output appears as a current source is (VVCC
VIMAX)/RSENSE.
This part is offered in both 18-pin DW wide-body
(SOIC) and dual-in-line (DIL) packages.
VCC
VOUT
UDG−03114
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCT PREVIEW information concerns products in the formative or
design phase of development. Characteristic data and other
specifications are design goals. Texas Instruments reserves the right to
change or discontinue these products without notice.
www.ti.com
Copyright 2003, Texas Instruments Incorporated
1




etcTI

UC2914 Datasheet Preview

UC2914 Datasheet

Power Manager

No Preview Available !

UC2914
UC3914
ą
SLUS425C − DECEMBER 2003 − REVISED JULY 2004
DESCRIPTION (continued)
When the output current is less than the fault level, the external output transistor remains switched on. When
the output current exceeds the fault level, but is less than the maximum sourcing level programmed by IMAX,
the output remains switched on, and the fault timer starts to charge CT, a timing capacitor. Once CT charges
to 2.5 V, the output device is turned off and CT is slowly discharged. Once CT is discharged to 0.5 V, the device
performs a retry and the output transistor is switched on again. The UC3914 offers two distinct reset modes.
In one mode with LR left floating or held low, the device tries to reset itself repeatedly if a fault occurs as
described above. In the second mode with LR held high, once a fault occurs, the output is latched off until either
LR is toggled low, the part is shutdown then re−enabled using SD, or the power to the part is turned off and then
on again.
ABSOLUTE MAXIMUM RATINGS
over operating free-air temperature range unless otherwise noted.(1)(2)
UC2914
UC3914
UNIT
Input supply voltage
VCC
40
SD, LR
Maximum forced voltage
IMAX
12
VCC
V
Maximum current
FAULT
PLIM
20
mA
10
Maximum voltage
FAULT
40 V
Reference output current
internally limited
A
Storage temperature range, Tstg
−65 to 150
Junction temperature range, TJ
−55 to 150
°C
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds
300
(1) Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings only,
and functional operation of the device at these or any other conditions beyond those indicated under recommended operating conditions is
not implied. Exposure to Absolute Maximum Rated conditions for extended periods may affect device reliability
(2) Currents are positive into and negative out of the specifief terminal unless otherwise noted. All voltage values are with respect to the network
ground terminal.
RECOMMENDED OPERATING CONDITIONS
Supply voltage, VCC
Operating free-air temperature range, TA
UC2914
UC3914
MIN NOM MAX UNIT
5 35 V
−40 85
°C
0 70
2 www.ti.com


Part Number UC2914
Description Power Manager
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