PT6920 Datasheet, PDF (1/5 Pages) Texas Instruments – 5V TO 3.3V/2.5V 25 WATT DUAL OUTPUT INTEGRATED SWITCHING REGULATOR

For assistance or to order, call [phone]
PT6920 Series
5V TO 3.3V/2.5V 25 WATT DUAL OUTPUT
INTEGRATED SWITCHING REGULATOR
Revised 3/9/99
Application Notes
Mechanical Outline
Product Selector Guide
Features
• Dual Outputs:
+3.3V/6A
+2.5V/2.2A or +1.8V/1.5A
• Adjustable Output Voltage
• Remote Sense (both outputs)
• Standby Function
• Over-Temperature Protection
• Soft-Start
• Internal Sequencing
• 23-pin SIPPackage
The PT6920 is a new series of 25W
dual output ISRs designed to power the
latest generation DSP chips. Both out-
put voltages are independently adjustable
with external resistors. In addition, the
second output voltage of the PT6921 can
be selected for 2.5V or 1.8V to accom-
modate the next generation of DSP
chips. The internal power sequencing of
both outputs meet the latest require-
ments of TI’s ‘C6000 series DSPs.
Patent Pending*
Standard Application
C1 = Req’d 560µF electrolytic
C2 = Req’d 330µF electrolytic
C3 = Optional 100µF electrolytic
V2 Sense
STBY
V_IN
4,5,6
C1
GND
3
22 1
PT6920
7-11 16 23
18-21
12-15
R3
R4
V1 Sense
V2_OUT
V1_OUT
R1
+
C3
+
C2
R2
GND
Pin-Out Information
Pin Function
Pin
1 V₁ Remote Sense 13
2 Do Not Connect 14
3 STBY
15
4 V_in
16
5 Vin
17
6 Vin
18
7 GND
19
8 GND
20
9 GND
21
10 GND
22
11 GND
23
12 V1out
Function
V_1out
V1out
V1out
V₁ Adjust
Do Not Connect
V2out
V_2out
V2out
V2out
V₂ Remote Sense
V2 Adjust*
Ordering Information
PT6921t = +3.3 Volts
+2.5/+1.8 Volts
PT6922t = +3.3 Volts
+1.5 Volts
PT Series Suffix (PT1234X)
Case/Pin
Configuration
Vertical Through-Hole N
Horizontal Through-Hole A
Horizontal Surface Mount C
(For dimensions and PC board layout,
see Package Styles 1100 and 1110.)
Preliminary Specifications
Note: for PT6921 only:
with pin 23 open, V2out=2.5V
with pin 23 shorted to pin 22, V2out=1.8V
Characteristics
(T_a= 25°C unless noted)
Symbols
Conditions
PT6920 SERIES
Min
Typ
Output Current
Input Voltage Range
Output Voltage Tolerance
Line Regulation
Load Regulation
Io
Vin
∆Vo
Regline
Regload
Ta = +60°C, 200 LFM, pkg N V1 = 3.3V
0.1
—
V2 = 2.5V
0
—
V₂ = 1.8V
0
—
V2 = 1.2V
0
—
T_a = +25°C, natural convection V₁ = 3.3V
0.1
—
V2 = 2.5V
0
—
V2 = 1.8V
0
—
V₂ = 1.2V
0
—
0.1A ≤ Io ≤ Imax
4.5
—
Vin = +5V, Io = Imax, both outputs
0°C ≤ Ta ≤ +65°C
Vo-0.1
—
4.5V ≤ Vin ≤ 5.5V, Io = Imax
V1 = 3.3V
—
±7
V2 = 2.5V
—
±7
Vin = +5V, 0.1 ≤ Io ≤ Imax
V1 = 3.3V
—
±17
V2 = 2.5V
—
±4
Vo Ripple/Noise
Vn
Vin = +5V, Io = Imax
V1 = 3.3V
—
50
V2 = 2.5V
—
25
Transient Response
with C2 = 330µF
Efficiency
Switching Frequency
ttr
Io step between 0.5xImax and Imax
—
25
Vos
Vo over/undershoot
V1 = 3.3V
—
60
V₂ = 2.5V
—
60
η
Vin = +5V, Io = 4A total
—
75
ƒo
4.5V ≤ Vin ≤ 5.5V
0.1A ≤ Io ≤ Imax
475
600
Absolute Maximum
T_a
—
Operating Temperature Range
0
—
Recommended Operating
T_a
Temperature Range
Storage Temperature
T_s
Weight
—
Forced airflow = 200 LFM
Over Vin and Io Ranges
—
Vertical/Horizontal
0
—
-40
—
—
29
Note: The PT6920 series requires a 560µF electrolytic capacitor on the input and a 330µF electrolytic capacitor on the output for proper operation in all applications.
* This product is the subject of one or more patents. Other patents pending.
Max
5.5
2.2
1.75
1.2
6.0
2.2
1.75
1.2
5.5
Vo+0.1
±17
±13
±33
±10
—
—
—
—
—
—
725
+85
+65
+125
—
Units
A
A
A
A
A
A
A
A
V
V
mV
mV
mV
mV
mV
mV
µSec
mV
mV
%
kHz
°C
°C
°C
grams
Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 [phone] Fax: [phone] http://www.powertrends.com