PT7681 Datasheet, PDF (1/12 Pages) Texas Instruments – 30-A Programmable ISR With Margin Up/Down Controls

PT7681—5V
30-A Programmable ISR
With Margin Up/Down Controls
SLTS177B - DECEMBER 2002 - REVISED JULY 2006
Features
• 5V Input Voltage
• 30A Output Current
• 4-bit Programmable Output:
2V to 3.5V
• 95% Efficiency
• Margin Up/Down Controls
• Differential Remote Sense
• Over-Current Protection
• Over-Temperature Protection
• 27-Pin Solderable Copper Case
• 1.57in² PCB Area (‘N’ Suffix)
• IPC Lead-Free 2
Description
The PT7681 Excalibur™ is a high
performance integrated switching regu-
lator (ISR), which is housed in a 27-pin
space-saving solderable copper pack-
age. Operating from a +5V input source,
the PT7681 delivers up to 30A of out-
put current over the adjustable output
voltage range of 2V to 3.5V. The high
output current and relatively small size
makes the PT7681 suitable for power-
ing high-end DSP, microprocessor,
and ASIC circuits requiring core or I/O
logic supply voltages as low as 2V. The
output voltage is programmable via a
4-bit input code.
A special feature of the PT7681 is
the Margin Up and Margin Down
controls. These controls provide a
convenient method for testing the
load circuit over its supply voltage
margins during production and quali-
fication test programs.
Other features include output short-
circuit and over-temperature protection,
a standby on/off control, and a differ-
ential remote sense to compensate for
voltage drop between the regulator and
load.
Ordering Information
PT7681o = 2 to 3.5 Volts
PT Series Suffix (PT1234 x )
Case/Pin
Order Package
Configuration Suffix Code
Vertical
N
Horizontal A
SMD
C
(ENE)
(ENF)
(ENG)
(Reference the applicable package code
drawing for the dimensions and PC
board layout)
Standard Application
VID0
VID1
VID2
VID3
V_IN
GND
STBY
MAR_MG_AD_RGN_UP
MAR_MG_AU_RP_GDN
PROGRAMMING PINS
SENSE(+)
4321
26
L1
7-11
1µH
PT7681
20-25
V_OUT
+
C_IN
L
5 13-19 6 27 12
+
O
C_OUT
A
D
GND
SENSE(–)
Cin = Required 1500µF electrolytic
Cout = Required 330µF electrolytic
L1 = Optional 1µH input choke
For technical support and more information, see inside back cover or visit www.ti.com