PT8100 Series
40-A 3.3/5-V Input Programmable
Integrated Switching Regulator
SLTS157A
(Revised 8/23/2002)
Features
• 40ADC Output Current
• +3.3V or +5V Input
• Low Output Voltages:
0.8V—2.7V
• High Efficiency
• Programmable Output:
(VRM Compatible 5-bit Codes)
• Output Remote Sense
• Short-Circuit Protection
• Thermal Shutdown
• Standby On/Off Control
• Space-Saving Package
• Solderable Copper Case
• Multiphase Topology
Description
Ordering Information
The PT8100 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. Modules are avail-
able for operation from either a 3.3V
or 5V nominal input bus voltage.
Each provides up to 40A of output
current at output voltages as low
as 0.8V. The output voltage is pro-
grammable via a 5-bit input code.
The PT8100 series 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 modules are designed for high-
end computing and signal processing
applications, both of which demand
high output currents at low supply
voltages.
The modules have a number of
standard features to facilitate system
integration. These include short-
circuit protection, thermal shutdown,
standby (On/Off) control, and an
output remote sense to compensate
for voltage drop between the regu-
lator and the load. In addition, the
voltage programming codes are
compatible with Intel’s® VRM
specifications.
O utput Voltage
Input
Bus
Part N o.
Progam Range
PT 8101r =1.300 to 2.70V 5V
PT 8102r =1.075 to 1.85V 5V
PT 8103r =1.075 to 1.85V 3.3V
PT 8104r =1.050 to 1.825V 5V
PT 8105r =0.800 to 1.575V 3.3V
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)
Standard Application (See p.3 for PT8104 application schematic)
PROGRAMMING PINS
VID0
VID1
VID2
VID3
VID4
REMOTE SENSE
VID
Common
11
5
4
3
2
1
31
L1
VOUT
PT8100 Series
(Except PT8104)
12–16
23–30
VIN
1µH
L
O
A
D
C3
100µF
Optional
C1
1,500µF
Required
C2
660µF
Required
+
+
+
6
17–22
GND
GND
C1
C2
=
=
Required 1500µF electrolytic input capacitor
Required 660µF low ESR OS-Con®, or
1,200µF aluminum electrolytic
STBY*
Lin/C3
=
Optional input filter components. 1µH input
choke and 100µF electroytic capacitor.
1
For technical support and more information, see inside back cover or visit www.ti.com/powertrends