6-A 5-V/3.3-V Input Adjustable
Integrated Switching Regulator
• 6A Output Current
• Input Voltage Range:
3.1 V to 5.5 V
• 90% Efficiency
• Adjustable Output Voltage
• Standby Function
• Short Circuit Protection
• Small Footprint (0.61 in2)
• Solderable Copper Case
• 8.8 106 Hours MTBF
The PT6440 Excalibur™ power modules
are a series of high performance Integrated
Switching Regulators (ISRs), housed in a
thermally efficient solderable copper case.
These modules operate from input voltages
as low as 3.1V to produce a high-output low-
voltage power source; ideal for powering the
industry’s latest DSP and microprocessors.
The series includes standard output bus
voltages as low as 1.0VDC.
The innovative copper case construction
provides superior thermal performance in a
small footprint. Both through-hole and
surface mount pin configurations are avail-
able. The PT6440 series operating features
include external output voltage adjustment,
an On/Off inhibit, and short-circuit protection.
A 100µF input, and 330µF output capacitor
are required for proper operation.
PT6441H = 3.3 Volts
† PT6442H = 2.5 Volts
† PT6443H = 2.0 Volts
† PT6444H = 1.8 Volts
† PT6445H = 1.5 Volts
† PT6446H = 1.2 Volts
† PT6447H = 1.0 Volts
† 3.3V Input Bus Capable
PT Series Suffix (PT1234x )
* Previously known as package styles 1540/50.
(Reference the applicable package code drawing
for the dimensions and PC board layout)
1 Inhibit *
12 Vout Adj *
* For further information, see
Cin = Required 100µF electrolytic
Cout = Required 330µF electrolytic
For technical support and more information, see inside back cover or visit www.ti.com