PT6940 Datasheet, PDF (1/9 Pages) Texas Instruments – 6-A Dual Output 5-V/3.3-V Input Integrated Switching Regulator

PT6940 Series
6-A Dual Output 5-V/3.3-V Input
Integrated Switching Regulator
SLTS155B
Revised (4/8/2002)
Features
• High Efficiency Dual Output
(See Ordering Information)
• Ideal Power Source for DSPs
• 5V/3.3V Input
• 6A Rated (Both Outputs)
• Internal Power-up Sequencing
• Single On/Off Control
• Independent Adjust/Trim
• Remote Sensing (Vo₁ & Vo₂)
• Soft-Start
• Short-Circuit Protection
(coordinated shutdown)
• 27-pin Space-Saving Package
• Solderable Copper Case
Description
The PT6940 Excalibur™ power modules
are a series of high-efficiency dual-output
regulators, housed in a solderable space-
saving package. The dual output is ideal
for DSP applications that require a second
voltage source for a processor core.
Both outputs from the PT6940 regulator
modules are rated to deliver a full 6A load
current simultaneously, and are internally
sequenced to comply with the power-up
requirements of popular DSP ICs.
Each output can be independently
adjusted with a single external resistor, and
incorporates an output sense to compensate
for voltage drop between the regulator and
load. A short-circuit load fault at either
output will result in the coordinated
shutdown of both voltages.
Ordering Information
PT6941o = +3.3/2.5 Volts
PT6942o = +3.3/1.8 Volts
PT6943o = +3.3/1.5 Volts
PT6944o = +3.3/1.2 Volts
† PT6946o = +2.5/1.8 Volts
† PT6947o = +2.5/1.5 Volts
† PT6948o = +2.5/1.2 Volts
† -Denotes models that will also operate off
3.3V input bus.
PT Series Suffix (PT1234x)
Case/Pin
Configuration
Order Package
Suffix
Code
Vertical
Horizontal
SMD
N
(ENE)
A
(ENF)
C
(ENG)
(Reference the applicable package code drawing
for the dimensions and PC layout)
Pin-Out Information
Pin Function
1 STBY* †
2 Vo1 Adjust
3 Vo₁ Sense
4 Vo1
5 Vo1
6 Vo1
7 GND
8 GND
9 GND
10 GND
11 GND
12 GND
13 Vin
14 Vin
Pin Function
15 Vin
16 Vin
17 GND
18 GND
19 GND
20 GND
21 GND
22 GND
23 Vo2
24 Vo₂
25 Vo2
26 Vo2 Sense
27 Vo2 Adjust
† STBY* pin: Open = Outputs enabled
Ground = Outputs disabled
Standard Application
STBY*
V_IN
13–16
C_IN
+
330µF
GND
1
3
26
PT6940
4–6
23–25
Vo₁ Sense
Vo₂ Sense
Vo₁
Vo₂
7–12
17–22
Co₁
+ _Co2
+
330µF
330µF
GND
L
L
O
O
A
A
D
D
Cin = Req’d 330µF * electrolytic
Co1/Co2 = Req’d 330µF * electrolytic
*300µF for Oscon® or low ESR tantalum
(see application notes)
For technical support and more information, see inside back cover or visit www.ti.com