Standard Application
C1 = Required 330µF electrolytic
C2 = Required 330µF electrolytic
Q1= NFET-or Open Collector Gate
6 AMP 12V INPUT
INTEGRATED SWITCHING REGULATOR
PT6620 Series
PT6620
4,5,6
7,8,9,10
11,12,13
V
IN
COM COM
V
OUT
C
2
+
C
1
+
1
3
STBY Q
1
REMOTE SENSE
LOAD
Ordering Information
PT6621¨ = +3.3 Volts
PT6622¨ = +1.5 Volts
PT6623¨ = +2.5 Volts
PT6624¨ = +3.6 Volts
PT6625¨ = +5.0 Volts
PT6626¨ = +9.0 Volts
•Single Device: 6A Output
•Input Voltage Range: 9V to 14V
•Adjustable Output Voltage
•83% Efficiency
•Remote Sense Capability
•Standby Function
•Over-Temperature Protection
The PT6620 series is a new addition
to Power Trends’ line of 12V bus Inte-
grated Switching Regulators (ISRs).
Designed for stand-alone operation in
applications requiring as much as 6A of
output current, the PT6620 is packaged
in a 14-Pin SIP (Single In-line Package)
and is available in a surface-mount con-
figuration.
Only two external capacitors are
required for proper operation. Please
note that this product does not include
short circuit protection.
PT Series Suffix (PT1234X)
Case/Pin Heat Heat Spreader
Configuration Spreader with Side Tabs
Vertical Through-Hole PR
Horizontal Through-Hole DG
Horizontal Surface Mount EB
Pin Function
1Remote Sense
2Do Not Connect
3STBY*- Standby
4V
in
5V
in
6V
in
7 GND
8 GND
9 GND
10 GND
11 Vout
12 Vout
13 Vout
14 Vout Adjust
Pin-Out Information
For assistance or to order, call (800) 531-5782
48 Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 (800) 531-5782 Fax: (630) 393-6902 http://www.powertrends.com
Note: Back surface
of product is
conducting metal
Pkg Style 400
Specifications
Characteristics
PT6620 SERIES
(Ta = 25°C unless noted) Symbols Conditions Min Typ Max Units
Output Current IoTa = 60°C, 200 LFM, pkg P 0.1* — 6.0** A
Ta = 25°C, natural convection 0.1* — 6.5** A
Input Voltage Range Vin 0.1A ≤ Io ≤ 6.0A Vo ≤ +5V +9 — +14 V
+6V≤Vo≤+9V Vo+3 — +14 V
Output Voltage Tolerance ∆VoVin = +12V, Io = 6.0A
Ta = 0 to 60°C Vo-0.1 — Vo+0.1 V
Output Voltage Adjust Range Voadj Pin 14 to Vo or ground Vo = +3.3V 2.3 — 4.5
Vo = +1.5V 1.4 — 2.7
Vo = +2.5V 1.9 — 3.7 V
Vo = +3.6V 2.5 — 4.8
Vo = +5.0V 2.9 — 6.5
Vo = +9.0V 5.2 — 10.0
Line Regulation Regline +9V≤Vin≤+14V, Io = 6.0A — ±0.5 ±1.0 %Vo
Load Regulation Regload Vin = +12V, 0.1≤ Io≤6.0A — ±0.5 ±1.0 %Vo
Vo Ripple/Noise VnVin = +12V, Io = 6.0A Vo < +6V — 50 — mVpp
Vo > +6V — 1.0 — %Vo
Transient Response ttr Io step between 3.0A and 6.0A — 100 — µSec
with C2 = 330µF Vos Vo over/undershoot — 150 — mV
Efficiency ηVin = +12V, Io = 3.0A Vo= +3.3/3.6V — 84 — %
Vo = +1.5V — 68 — %
Vo = +2.5V — 76 — %
Vo = +5.0V — 86 — %
Vo = +9.0V — 93 — %
Vin = +12V, Io =6.0A Vo= +3.3/3.6V — 83 — %
Vo = +1.5V — 66 — %
Vo = +2.5V — 75 — %
Vo = +5.0V — 85 — %
Vo = +9.0V — 92 — %
*
ISR will operate down to no load with reduced specifications.
** See SOA curves - Output power is limited to 30W maximum.
Note:
The PT6620 Series requires a 330µF(output) and 330µF(input) electrolytic capacitors for proper operation in all applications.
Revised 2/5/99
Application Notes
Mechanical Outline
Product Selector Guide
CHARACTERISTIC DATA
PT6620 Series
For assistance or to order, call (800) 531-5782
49
12V Bus Products
DATA SHEETS
Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 (800) 531-5782 Fax: (630) 393-6902 http://www.powertrends.com
PT6621P, 3.3V
Note: SOA curves represent operating conditions at which internal components are at or below manufacturer’s maximum rated operating temperatures.
Efficiency vs Output Current
Efficiency (%)
Output Current (A)
Ambient Temperature (°C)
Output Current (A)
Airflow
Recommended Maximum
Operating Temperature
Ambient Temperature (°C)
Output Current (A)
Airflow
PT6620 Series @VPT6620 Series @V
PT6620 Series @VPT6620 Series @V
PT6620 Series @Vin=+12Vin=+12V
in=+12Vin=+12V
in=+12V
Recommended Maximum
Operating Temperature
Specifications (continued)
Characteristics
PT6620 SERIES
(Ta = 25°C unless noted) Symbols Conditions Min Typ Max Units
Switching Frequency ƒo9V ≤ Vin ≤ 14V 500 650 775 kHz
0.1A ≤ Io ≤ 6.0A PT6622 500 550 600 kHz
Recommended Operating TaFree Air Convection (40-60 LFM) -40 — +65** °C
Temperature Range Over Vin and Io ranges with heat tab
Absolute Maximum Ta-40 — +85 °C
Operating Temperature Range
Storage Temperature Ts— -40 — +125 °C
Mechanical Shock — Per Mil-STD-883D, Method 2002.3 — 500 — G’s
Mechanical Vibration — Per Mil-STD-883D, Method 2007.2, — 7.5 — G’s
20-2000 Hz, soldered in a PC board
Weight — — — 14 — grams
** See SOA curves - Output power is limited to 30W maximum.
Note:
The PT6620 Series requires a 330µF(output) and 100µF(input) electrolytic capacitors for proper operation in all applications.
PT6622P, 1.5VOutput Ripple vs Output Current
Power Dissipation vs Output Current
Output Current (A)
Output Current (A)
Ripple (mVpp)
Pd (Watts)
Safe Operating Area Curves @VSafe Operating Area Curves @V
Safe Operating Area Curves @VSafe Operating Area Curves @V
Safe Operating Area Curves @Vin=+12Vin=+12V
in=+12Vin=+12V
in=+12V
20
30
40
50
60
70
80
90
01234567
Nat conv
60LFM
120LFM
200LFM
20
30
40
50
60
70
80
90
01234567
Nat conv
60LFM
120LFM
200LFM
Ambient Temperature (°C)
Output Current (A)
Airflow
Recommended Maximum
Operating Temperature
PT6625P, 5.0V
20
30
40
50
60
70
80
90
01234567
Nat conv
60LFM
120LFM
200LFM
40
50
60
70
80
90
100
0123456
PT6621
PT6622
PT6623
PT6625
PT6626
0
5
10
15
20
25
30
0123456
PT6621
PT6622
PT6623
PT6625
PT6626
0
1
2
3
4
5
0123456
PT6621
PT6622
PT6623
PT6625
PT6626
For assistance or to order, call (800) 531-5782
3
Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 (800) 531-5782 Fax: (630) 393-6902 http://www.powertrends.com
Application Notes
PT6620 Series
More Application Notes
Adjusting the Output Voltage of the
PT6620 7Amp12V Bus Converter Series
The output voltage of the Power Trends PT6650 Series ISRs
may be adjusted higher or lower than the factory trimmed pre-
set voltage with the addition of a single external resistor. Table 1
accordingly gives the allowable adjustment range for each model
in the series as Va (min) and Va (max).
Adjust Up: An increase in the output voltage is obtained by
adding a resistor R2, between pin 14 (Vo adjust) and pins 7-10
(GND).
Adjust Down: Add a resistor (R1), between pin 14 (Vo adjust)
and pins 11-13 (Vout).
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 loca-
tion. 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 pin. Any capacitance added to
the Vo adjust pin will affect the stability of the ISR.
3. If the Remote Sense feature is being used, connecting the
resistor (R1) between pin 14 (Vo adjust) and pin 1 (Remote
Sense) can benefit load regulation.
4. The minimum input voltage required by the part is Vout + 3,
or 9V, whichever is higher.
5. The maximum output current must be limited to the equiva-
lent of 30Watts.
i.e. Iout (max) = 12 Adc,
Va
where Va is the adjusted output voltage.
Figure 1
C
in
330
µ
F
+
C
out
330
µ
F
+
(R1)
Adj Down
R2
Adjust Up
Vo
COMCOM
Vin PT6620
11,12,13
147,8,9,10
4,5,6 Vin Vo
GND Vo(adj)
STBY
3
Vsense
1
L
O
A
D
The values of (R1) [adjust down], and R2 [adjust up], can
also be calculated using the following formulae.
Ro (Va – 1.25)
(R1) = (Vo – Va)– RskΩ
1.25 Ro– RskΩ
R2 = Va - Vo
Where: Vo= Original output voltage
Va= Adjusted output voltage
Ro= The resistance value in Table 1
Rs= The series resistance from Table 1
Table 1
PT6620 ADJUSTMENT AND FORMULA PARAMETERS
Series Pt # PT6622 PT6623 PT6621 PT6624 PT6625 PT6626
Vo (nom) 1.5V 2.5V 3.3V 3.6V 5.0V 9.0V
Va (min) 1.4V 1.9V 2.3V 2.5V 2.9V 5.2V
Va (max) 2.7V 3.7V 4.5V 4.8V 6.5V 10.0V
Ro (kΩΩ
ΩΩ
Ω)4.99 10.0 12.1 12.1 16.2 12.1
Rs (kΩΩ
ΩΩ
Ω)2.49 4.99 12.1 12.1 12.1 12.1
For assistance or to order, call (800) 531-5782
4
Application
Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 (800) 531-5782 Fax: (630) 393-6902 http://www.powertrends.com
Notes
PT6620 Series
Table 2
PT6620 ADJUSTMENT RESISTOR VALUES
Series Pt # PT6622 PT6623 PT6621 PT6624 PT6625 Series Pt # PT6625 PT6626
Current 7.5Adc 7.5Adc 7.5Adc 7.5Adc 6.0Adc Current 6Adc 3.3Adc
Vo (nom) 1.5Vdc 2.5Vdc 3.3Vdc 3.6Vdc 5.0Vdc Vo (nom) 5.0Vdc 9.0Vdc
Va (req’d) Va (req’d)
1.4 (5.0)kΩ5.2 89.1k (0.5)kΩ
1.5 5.3 55.4k (1.1)kΩ
1.6 59.9k 5.4 38.5k (1.9)kΩ
1.7 28.7k 5.5 28.4k (2.6)kΩ
1.8 18.3k 5.6 21.7k (3.4)kΩ
1.9 13.1k (5.8)kΩ5.7 16.8k (4.2)kΩ
2.0 10.0k (10.0)kΩ5.8 13.2k (5.1)kΩ
2.1 7.9k (16.3)kΩ5.9 10.4k (6.1)kΩ
2.2 6.4k (26.7)kΩ6.0 8.2k (7.1)kΩ
2.3 5.3k (47.5)kΩ(0.6)kΩ6.1 6.3k (8.1)kΩ
2.4 4.4k (110.0)kΩ(3.4)kΩ6.2 4.8k (9.3)kΩ
2.5 3.8k (6.8)kΩ(1.7)kΩ6.3 3.5k (10.5)kΩ
2.6 3.2k 120.0k (11.2)kΩ(4.2)kΩ6.4 2.4k (11.9)kΩ
2.7 57.5k (17.1)kΩ(7.4)kΩ6.5 1.4k (13.3)kΩ
2.8 36.7k (25.4)kΩ(11.3)Ω6.6 (14.9)kΩ
2.9 26.3k (37.8)kΩ(16.4)kΩ(0.6)kΩ6.7 (16.6)kΩ
3.0 20.0k (58.5)kΩ(23.2)kΩ(2.1)kΩ6.8 (18.4)kΩ
3.1 15.8k (99.8)kΩ(32.7)kΩ(3.7)Ω6.9 (20.5)kΩ
3.2 12.9k (224.0)kΩ(46.9)kΩ(5.5)kΩ7.0 (22.7)kΩ
3.3 10.6k (70.6)kΩ(7.4)kΩ7.1 (25.2)kΩ
3.4 8.9k 139.0k (118.0)kΩ(9.7)kΩ7.2 (27.9)kΩ
3.5 7.5k 63.5k (260.0)kΩ(12.2)kΩ7.3 (31.0)kΩ
3.6 6.4k 38.3k (15.1)kΩ7.4 (34.4)kΩ
3.7 5.4k 25.7k 139.0k (18.4)kΩ7.5 (38.3)kΩ
3.8 18.2k 63.5k (22.3)kΩ7.6 (42.8)kΩ
3.9 13.1k 38.3k (26.9)kΩ7.8 (53.9)kΩ
4.0 9.5k 25.7k (32.5)kΩ8.0 (69.6)kΩ
4.1 6.8k 18.2k (39.2)kΩ8.2 (93.0)kΩ
4.2 4.7k 13.1k (47.6)kΩ8.4 (132.0)kΩ
4.3 3.0k 9.5k (58.5)kΩ8.6 (210.0)kΩ
4.4 1.7k 6.8k (73.0)kΩ8.8 (445.0)kΩ
4.5 0.5k 4.7k (93.2)kΩ9.0
4.6 3.0k (124.0)kΩ9.2 63.5k
4.7 1.7k (174.0)kΩ9.4 25.7k
4.8 0.5k (275.0)kΩ9.6 13.1k
4.9 (579.0)kΩ9.8 6.8k
5.0 10.0 3.0k
5.1 190.0k
R1 = (Red) R2 = Black
IMPORTANT NOTICE
Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue
any product or service without notice, and advise customers to obtain the latest version of relevant information
to verify, before placing orders, that information being relied on is current and complete. All products are sold
subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those
pertaining to warranty, patent infringement, and limitation of liability.
TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in
accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent
TI deems necessary to support this warranty . Specific testing of all parameters of each device is not necessarily
performed, except those mandated by government requirements.
CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF
DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE (“CRITICAL
APPLICATIONS”). TI SEMICONDUCTOR PRODUCTS ARE NOT DESIGNED, AUTHORIZED, OR
WARRANTED TO BE SUITABLE FOR USE IN LIFE-SUPPORT DEVICES OR SYSTEMS OR OTHER
CRITICAL APPLICA TIONS. INCLUSION OF TI PRODUCTS IN SUCH APPLICATIONS IS UNDERSTOOD TO
BE FULLY AT THE CUSTOMER’S RISK.
In order to minimize risks associated with the customer’s applications, adequate design and operating
safeguards must be provided by the customer to minimize inherent or procedural hazards.
TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent
that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other
intellectual property right of TI covering or relating to any combination, machine, or process in which such
semiconductor products or services might be or are used. TI’s publication of information regarding any third
party’s products or services does not constitute TI’s approval, warranty or endorsement thereof.
Copyright 1999, Texas Instruments Incorporated
