Document
PT6400 Series
3 Amp 5V Input Adjustable Integrated Switching Regulator
SLTS032A
(Revised 6/30/2000)
• Single-Device 5V to 3V Power • 85% Efficiency • Small SIP Footprint • Adjustable Output Voltage
The PT6400 is a high performance +5V to +3.3V, 3 Amp, 12-Pin SIP (Single In-line Package) Integrated Switching Regulator (ISR) designed for stand alone (not parallelable) operation. This high-performance ISR
allows easy integration of low-power 3.3V logic IC’s into existing 5V systems without redesigning the central power supply. Only two external capacitors are required for proper operation. The output voltage is easily adjustable with one external resistor. The PT6406,7,8 can be used to terminate high-speed data buses such as Futurebus (+2.1V) or the new GTL (+1.2V) logic buses.
Please note that this product does not include short circuit protection.
Standard Application
V IN
2,3,4
C1 + 100µF
COM
PT6400
5,6,7,8
12
9,10,11
R1
(V OUP)
R2
(V ODOWN)
V OUT
C2 + 100µF
COM
C1 = Required 100µF electrolytic C2 = Required 100µF electrolytic
Pin-Out Information
Pin Function
1 Do not connect 2 Vin 3 Vin 4 Vin 5 GND 6 GND 7 GND 8 GND 9 Vout 10 Vout 11 Vout 12 VoutAdjust
Ordering Information
PT6404
= +1.5 Volts PT6405
= +3.3 Volts PT6406
= +1.8 Volts PT6407
= +2.1 Volts PT6408
= +1.2 Volts PT6409
= +2.5 Volts
Pkg Style 300 PT6400
PT Series Suffix (PT1234X)
Case/Pin Configuration Vertical Through-Hole Horizontal Through-Hole Horizontal Surface Mount
P D E
Note: Back surface of product is conducting metal.
Specifications
Characteristics (Ta = 25°C unless noted)
Symbols
Conditions
Output Current
Io 4.5V ≤ Vin ≤ 5.5V
Current Limit
Icl Vin = +5V
Input Voltage Range Vin 0.1A ≤ Io ≤ 3.0A
Output Voltage Tolerance
∆Vo
Vin = +5V, Io = 3.0A 0°C ≤ Ta ≤ +70°C
Line Regulation Load Regulation Vo Ripple/Noise
Regline Regload Vn
4.5V ≤ Vin ≤ 5.5V, Io = 3.0A Vin = +5V, 0.3 ≤ Io ≤ 3.0A Vin = 5V, Io = 3.0A
Transient Response with C2 = 100µF
ttr Io step between 1.5A and 3.0A Vos Vo over/undershoot
Efficiency
η Vin = +5V, Io = 1.5A Vo= 3.3V Vo= 1.8V
Vo= 2.1V
Vo= 1.2V
Switching Frequency
ƒo
4.5V ≤ Vin ≤ 5.5V 0.3A ≤ Io ≤ 3.0A
Absolute Maximum Operating Temperature Range
Ta
Recommended Operating Temperature Range
Thermal Resistance
Ta
θja
Free Air Convection (40-60 LFM) At Vin= 5V, Io=2.5A
Free Air Convection (40-60 LFM)
Storage Temperature Mechanical Shock
Ts
— Per Mil-STD-883D, Method 2002.3 , 1 msec, Half Sine, mounted to a fixture
Mechanical Vibration Weight
—
Per Mil-STD-883D, Method 2007.2, 20-2000 Hz, Soldered in a PC board
—
*ISR will operate down to no load with reduced specifications
PT6400 SERIES Min Typ 0.1* — — 3.6 4.5 —
Vo-0.05 —
— ±10 — ±10 — 66 — 200 — 200 — 85 — 74 — 77 — 63
500 650
0—
0—
— 25 -40 —
— 500
— 15 — 6.5
**See Thermal Derating chart. Note: The PT6400 Series requires two 100µF electrolytic or tantalum capacitors for proper operation in all applications.
Max
3.0 5.0 5.5
Vo+0.05
±25 ±25 165 — — — — — —
800
+85
Units
A A V
V
mV mV mV µSec mV % % % %
kHz
°C
+ 70** — +125 —
— —
°C °C/W °C G’s
G’s grams
For technical support and more information, see inside back cover or visit www.ti.com/powertrends
PT6400 Series
3 Amp 5V Input Adjustable Integrated Switching Regulator
Typical Characteristics
PT6408, 1.2 VDC (See Note 1)
PT6407, 2.1 VDC (See Note 1)
PT6405, 3.3 VDC (See Note 1)
Efficiency - %
Ripple-(mV)
Efficiency vs Output Current
100
90 Vin
80 4.5V
70 5.0V 5.5V
60
50
40 0.0 0.5 1.0 1.5 2.0 2.5 3.0
Iout-(Amps)
Efficiency - %
Efficiency vs Output Current
100
90 Vin
80 4.5V 70 5.0V
5.5V 60
50
40 0 0.5 1 1.5 2 2.5 3
Iout-(Amps)
Ripple vs Output Current
100
80
60 Vin 5 .5V
40 5 .0V
20 4.5V
0 0 0.5 1 1.5 2 2.5 3
Iout-(Amps)
Thermal Derating (Ta) (See Note 2)
3
85°C
2.5
2
1.5
1
0.5
0
4.5 4 .7 5
5
5 .2 5
5.5
Vin-(Volts)
Power Dissipation vs Output Current
3.0 2.5 Vin 2.0 5.5V 1.5 5.0V
4.5V 1.0 0.5 0.0
0.0 0.5 1.0 1.5 2.0 2.5 3.0
Iout-(Amps)
PD-(Watts)
Iout-(Amps)
Ripple-(mV)
Ripple vs Output Current
100
80 Vin 60 5.5V
5.0V 40
4.5V 20
0 0 0.5 1 1.5 2 2.5 3
Iout-(Amps)
Thermal Derating (Ta) (See Note 2)
3 85°C 2.5
2 1.5
1 0.5
0 4.5 4.75 5 5.25 5.5
Vin-(Volts)
Power Dissipation vs Output Current
2.5 2 Vin 5 .5 V
1.5 5 .0 V
1 4.5V
0.5
0 0 0.5 1 1.5 2 2.5 3 Iout-(Amps)
PD-(Watts)
Iout-(Amps)
Ripple-(mV)
Efficiency - %
Efficiency vs Output Current
100
90 V in
80 4.5V
70 5.0V 5.5V
60
50
40 0 0.5 1 1.5 2 2.5 3
Iout-(Amps)
Ripple vs Output Current
100 80 60 40 20 0 0 0.5 1 1.5 2 2.5 3
Vin 5.5V 5.0V 4.5V
Iout-(Amps)
Thermal Derating (Ta) (See Note 2)
3 85°C 2.5
2 1.5
1 0.5
0 4.5 4.75 5 5.25 5.5 Vin-(Volts)
Power Dissipation vs Output Current
2.5
2 Vin 1.5 5.5V
5.0V 1 4.5V
0.5
0 0 0.5 1 1.5 2 2.5 3
Iout-(Amps)
Iout-(Amps)
PD-(Watts)
Note 1: All data listed in the above graphs, except for derating data.