PT8120 Series
30-A 12-V Input Programmable
Integrated Switching Regulator
SLTS158B
(Revised 6/6/2002)
Features
• Single Device: 30ADC
• +12V-Input
• High Efficiency: 92% @3.3V
• Programmable Output:
(VRM Compatible 5-bit Codes)
• Thermal Shutdown
• Standby On/Off Control
• Space-Saving Package
• Solderable Copper Case
• Multiphase Topology
• Output Remote Sense
• Over-Current Protection
Description
Ordering Information
The PT8120 Excalibur™ power
modules are a family of high-output,
high-efficiency, fully integrated
switching regulators (ISRs), housed
in a solderable 31-pin space-saving
copper package. These modules
operate from a nominal input voltage
of +12V to provide up to 30A of
output current at output voltages as
low as 0.8V. The output voltage is
programmable via a 5-bit input code.
The PT8120 family incorporates
a state-of-the-art, 2-phase, multiple
power path topology. This extends
the output current range while pro-
viding superior transient response
and input current ripple performance.
The PT8120 family is designed
to power high-end computing and
signal processing applications, all of
which demand high output currents
at low supply voltages.
The modules have a number of
features to facilitate system integra-
tion. These include over-current
protection, thermal shutdown, an
on/off standby control, and an output
remote sense to compensate for
voltage drop between the regulator
and the load. In addition, the volt-
age programming codes for the
PT8121, PT8122, & PT8124 are
compatible with Intel’s® VRM
specifications.
PT 8121r = 1.3V
to 3.5V
PT 8122r = 1.075V to 1.85V
PT 8123r = 0.8V
to 1.575V
PT 8124r = 1.05V to 1.825V
PT 8125r = 4.5V to 7.6V
PT Series Suffix
(PT1234x)
Case/Pin
Configuration
O rder
Suffix
Package
Code
Vertical
Horizontal
SMD
N
A
C
(EKH)
(EKF)
(EKG)
(Reference the applicable package code drawing for
the dimensions and PC board layout)
PT812x Standard Application (See page 4 for PT8124 application schematic)
PROGRAMMING PINS
VID0
VID1
VID2
VID3
VID4
REMOTE SENSE
VID
Common
11
5
4
3
2
1
31
Lin
VOUT
PT8120 Series
12–16
+
23–30
VIN
(Except PT8124)
1µH
L
+
O
A
D
6
17–22
CIN
COUT
GND
GND
STBY*
Cin = Required 1500µF electrolytic
Cout = Required 660µF low ESR OS-Con®, or
1,200µF aluminum electrolytic
Lin = Optional 1µH input choke
For technical support and more information, see inside back cover or visit www.ti.com