ETC PT6705A

PT6705 Series
13 Amp 5V/3.3V Input Adjustable
Integrated Switching Regulator
SLTS099
(Revised 6/30/2000)
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The PT6705 is a series of low-cost,
high-performance, 13 Amp Integrated
Switching Regulators (ISRs) housed in a
unique, space-saving 17-pin SIP package.
The PT6705 will operate off either a 5V
or 3.3V input bus to provide a low-voltage
power source for the industry’s latest highspeed, low-voltage µPs, and bus drivers.
The PT6705 incorporates internal
short circuit protection, and requires a
+12V/50mA bias input for operation.
+3.3V/5V input (+12V Bias)
Adjustable Output Voltage
90% Efficiency
Differential Remote Sense
17-pin Space-Saving Package
Solderable Copper Case
Short Circuit Protection
Patent pending on package assembly
Standard Application
Pin-Out Information
STBY*
Vout Adjust
+12V BIAS
REMOTE SENSE (+)
3
L1
VIN
4-6
1H
CIN
2
PT6705
VOUT
13 - 16
7
8 - 12
+
17
1
COUT
+
LOAD
REMOTE
SENSE (-)
GND
Pin Function
Pin Function
1
2
Vout Adjust
STBY*
10
GND
11
GND
3
4
+12V Bias Input
Vin
12
13
GND
Vout
5
6
Vin
Vin
14
15
Vout
Vout
16
17
Vout
7
Remote Sense Gnd
8
GND
9
GND
(4)
Remote Sense Vout
For STBY* pin
open = output enabled
ground = output disabled.
GND
Cin = Required 1000µF electrolytic
Cout= Required 330µF electrolytic
L1 = Optional 1µH input choke
Specifications
PT6705 SERIES
Characteristics
(Ta = 25°C unless noted)
Symbols
Conditions
Min
Typ
Max
Units
Output Current
Io
Ta = +60°C, 200 LFM, pkg N
Ta = +25°C, natural convection
0.1 (1)
0.1 (1)
—
—
13.0
13.0
A
Input Voltage Range
Vin
0.1A ≤Io ≤13A
4.5
3.1
—
—
5.5
5.5
V
External Bias Voltage Range
Vb
0.1A ≤Io ≤13A, –40°C ≤Ta ≤+85°C
11.5
12.0
13.0
V
External Bias Current
Ib
0.1A ≤Io ≤13A, –40°C ≤Ta ≤+85°C
—
—
50
mA
Output Voltage Tolerance
∆Vo
Vin = +5V, Vb = +12V, Io =13A
-40°C ≤ Ta ≤ +85°C
Vo-0.03
—
Vo+0.03
V
Short-Circuit Threshold
Isc
Vin = +5V, Vb = +12V
—
18
30
A
Line Regulation
Regline
4.5V ≤Vin ≤ 5.5V, Vb = +12V, Io =13A
—
±5
—
mV
Load Regulation
Regload
Vin = +5V, Vb = +12V, 0.1 ≤Io ≤13A
—
±10
—
mV
Vo Ripple/Noise
Vn
Vin = +5V, Vb = +12V, Io =13A
—
35
—
mV
Transient Response
with Cout = 330µF
ttr
Vos
Io step between 6.5A and 13A
Vo over/undershoot
—
—
50
100
—
—
µSec
mV
Efficiency
η
Vin = +5V, Io = 9A, Vb =+12V
—
—
—
—
91
88
85
83
—
—
—
—
%
PT6705/6
PT6707/8
Vo
Vo
Vo
Vo
= 3.3V
= 2.5V
= 1.8V
= 1.5V
Switching Frequency
ƒo
4.5V ≤Vin ≤5.5V, Vb = +12V
0.1A ≤ I o ≤ 13A
300
350
400
kHz
Absolute Maximum
Operating Temperature Range
Ta
Over Vin Range
-40 (2)
—
+85 (3)
°C
Storage Temperature
Ts
—
-40
—
+125
°C
Mechanical Shock
Per Mil-STD-883D, Method 2002.3
1msec, Half sine, mounted to a fixture
—
500
—
G
Mechanical Vibration
Per Mil-STD-883D, Method 2007.2,
20-2000 Hz, Soldered in a PC board
—
15
—
G
—
—
26
—
grams
Weight
—
Notes: (1) The ISR-will operate down to no load with reduced specifications.
(2) For operation below 0°C, Cin and Cout must have stable characteristics. Use either low ESR tantalum or Oscon® capacitors.
(3) See Safe Operating Area curves, or contact the factory for appropriate derating.
(4) If the remote sense ground is not used, pin 7 must be connected to pin 8 for optimum output voltage accuracy.
For technical support and more information, see inside back cover or visit www.ti.com/powertrends
PT6705 Series
13 Amp 5V/3.3V Input Adjustable
Integrated Switching Regulator
PT Series Suffix (PT1234X)
Ordering Information
PT6705❏
❏ = 3.3 Volts
❏ = 2.5 Volts
PT6706❏
❏ = 1.8 Volts
PT6707❏
❏ = 1.5 Volts
PT6708❏
PT6700 Product Family
Case/Pin
Configuration
Vertical Through-Hole
N
Horizontal Through-Hole A
Horizontal Surface Mount C
(For dimensions and PC board layout,
see Package Styles 1340 and 1350.)
Input
Voltage
Vout
Adjust
OVP/
Pwr Good
PT6701
5V
VID
✓
PT6702
3.3V
VID
✓
PT6705
5V
Resistor
PT6715
5V
Resistor
PT6721
12V
VID
PT6725
12V
Resistor
Requires
+12V Bias
✓
✓
Filter/Capacitor Selection
Output Capacitors: The PT6705 requires a minimum ouput capacitance of 330µF for proper operation. The maximum allowable output capacitance is 15,000µF.
Input Filter: An input filter is optional for most applications. The input inductor must be sized to handle 10ADC with a typical value of 1µH. The input capacitance must
be rated for a minimum of 2.0Arms of ripple current. For transient or dynamic load applications, additional capacitance may be required.
T Y P I C A L
All Models, Vin =5.0V
C H A R A C T E R I S T I C S
PT6707, PT6708, Vin =3.3V
(Note A)
Efficiency vs Output Current
Efficiency vs Output Current
100
100
95
95
90
Efficiency - %
Vout
85
3.3V
2.5V
1.8V
1.5V
80
75
Efficiency - %
90
85
Vout
1.8V
1.5V
80
75
70
70
65
65
60
60
0
2
4
6
8
10
12
14
0
2
4
6
Power Dissipation vs Output Current
10
12
14
Power Dissipation vs Output Current
6
6
5
5
4
Vout
3.3V
1.5V
3
4
Pd - Watts
Pd - Watts
8
Iout (A)
Iout (A)
Vout
1.8V
1.5V
3
2
2
1
1
0
0
0
2
4
6
8
10
12
14
0
2
4
Iout (A)
6
8
10
12
14
Iout (A)
Safe Operating Area, PT6705, Vin =5.0V
(Note B)
Safe Operating Area, PT6707, Vin =3.3V
90.0
90.0
80.0
80.0
70.0
Airflow
200LFM
120LFM
60LFM
Nat conv
60.0
50.0
40.0
Ambient Temperature ( C)
Ambient Temperature ( C)
(Note A)
70.0
(Note B)
Airflow
200LFM
120LFM
60LFM
Nat conv
60.0
50.0
40.0
30.0
30.0
20.0
20.0
0.0
2.0
4.0
6.0
8.0
Iout (A)
10.0
12.0
14.0
0.0
2.0
4.0
6.0
8.0
10.0
12.0
14.0
Iout (A)
Note A: All data in the above graphs has been developed from actual products tested at 25°C. This data is considered typcial for the ISR.
Note B: SOA curves represent the conditions at which internal components are at or below the manufacturer’s maximum operating temperatures.
For technical support and more information, see inside back cover or visit www.ti.com/powertrends
Application Notes
PT6705/6715 Series
Adjusting the Output Voltage of the PT6705 and
PT6715 Excalibur™ Converters
Both the PT6705 and PT6715 series ISRs are non-programmable versions of the PT6700 Excalibur™ family of
converters. These regulators have a fixed output voltage,
which may be adjusted higher or lower than the factory
trimmed pre-set voltage using a single external resistor. Table
1 gives the allowable adjustment range for each model as
Va (min) and Va (max).
Adjust Up:
An increase in the output voltage is obtained by
adding a resistor R2, between pin 1 (Vo adjust) and pin 7
(–Remote Sense).
Adjust Down: Add a resistor (R1), between pin 1 (Vo adjust)
and pin 17 (+Remote Sense).
Refer to Figure 1 and Table 2 for both the placement and value
of the required resistor, either (R1) or R2 as appropriate.
Notes:
1. Use only a single 1% resistor in either the (R1) or R2
location. Place the resistor as close to the ISR as
possible.
2. Never connect capacitors from Vo adjust to either
GND, Vout, or the Remote Sense pins. Any
capacitance added to the Vo adjust pin will affect the
stability of the ISR.
3. If the Remote Sense feature is not being used, pin 7
must be connected to pin 8 for optimum output voltage
accuracy. Correspondingly the resistors (R1) and R2
may be then be connected from Vo Adjust to either
Vout or GND respectively.
4. The PT6705 series requires a 12V external bias voltage
in order to operate (see data sheet). An external bias
voltage is not required for the PT6715 series.
5. Adjusting the output voltage of the PT6705 and
PT6715 (3.3V models) higher than the factory pretrimmed output voltage may require an increase in the
minimum input voltage. These two models must
comply with the following requirements for Vin(min).
PT670x models:
= (Va + 1)V
Vin(min)
Figure 1
Bias
(Req’d for PT6705)
4,5,6
+5V
2
3
17
Stby*
V Bias
Sns(+)
PT6705/PT6715
V in
GND
8 12
Vo(adj)
1
V out
Sns(-)
7
13 16
Vo
(R1)
Adj Down
+
+
C in
L
O
A
D
C out
R2
Adjust
Up
COM
COM
The values of (R1) [adjust down], and R2 [adjust up], can
also be calculated using the following formulas.
(R1)
=
R2
=
Where: Vo
Va
Rs
10⋅(Va – 1.27)
(Vo – Va)
12.7
Va - Vo
kΩ
– Rs
kΩ
– Rs
= Original output voltage
= Adjusted output voltage
= Series resistance value from Table 1
Table 1
PT6705/PT6715 SERIES ADJUSTMENT PARAMETERS
Series Pt #
12V Bias (4)
No-Bias
PT6708
PT6718
PT6707
PT6717
PT6706
PT6716
PT6705
PT6715
Vo (nom)
Va (min)
1.5
1.8
2.5
3.3
1.47
1.75
2.25
2.75
Va (max)
Ω)
Rs (kΩ
1.73
2.0
2.85
3.75
PT671x models:
Vin(min)
= (Va + 1)V or 4.5V, whichever is greater.
For technical support and more information, see inside back cover or visit www.ti.com/powertrends
49.9
49.9
33.2
24.9
Application Notes continued
PT6705/6715 Series
Table 2
PT6705/PT6715 SERIES ADJUSTMENT RESISTOR VALUES
Series Pt #
12V Bias 4
No Bias
Vo (nom)
Va (req’d)
PT6708
PT6718
1.5
1.47
(16.8)kΩ
PT6707
PT6717
1.8
PT6706
PT6716
2.5
PT6705
PT6715
3.3
1.5
1.55
204.0kΩ
1.6
77.1kΩ
1.65
34.8kΩ
1.7
13.6kΩ
1.75
(46.1)kΩ
1.8
1.85
204.0kΩ
1.9
77.1kΩ
1.95
34.8kΩ
2.0
13.6kΩ
2.05
2.1
2.15
2.2
2.25
(6.0)kΩ
2.3
(18.3)kΩ
2.35
(38.8)kΩ
2.4
(79.8)kΩ
2.45
(203.0)kΩ
2.5
2.55
221.0kΩ
2.6
93.8kΩ
2.65
51.5kΩ
2.7
30.3kΩ
2.75
17.6kΩ
2.8
9.1kΩ
(5.7)kΩ
2.85
3.1kΩ
(10.2)kΩ
(2.0)kΩ
2.9
(15.9)kΩ
2.95
(23.1)kΩ
3.0
(32.8)kΩ
3.05
(46.3)kΩ
3.1
(66.6)kΩ
3.15
(100.0)kΩ
3.2
(168.0)kΩ
3.25
(371.0)kΩ
3.3
3.35
229.0kΩ
3.4
102.0kΩ
3.45
59.8kΩ
3.5
38.6kΩ
Requires Vin > 4.5Vdc 5
3.55
25.9kΩ
3.6
17.4kΩ
3.65
11.4kΩ
3.7
6.9kΩ
3.75
R1 = (Blue)
3.3kΩ
R2 = Black
For technical support and more information, see inside back cover or visit www.ti.com/powertrends
Package S tyle 1340
S uffix N
(Revised 6/30/2000)
PACKAGE INFORMATION AND DIMENSIONS
Power Trends proprietary package design.
All rights reserved. Patent pending.
For technical support and more information, see inside back cover or visit www.ti.com/powertrends
Package S tyle 1350
S uffix A, C
(Revised 6/30/2000)
PACKAGE INFORMATION AND DIMENSIONS
Power Trends proprietary package design.
All rights reserved. Patent pending.
For technical support and more information, see inside back cover or visit www.ti.com/powertrends
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