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Details, datasheet, quote on part number:PT7748N
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| Part: | PT7748N |
| Category: | Power Management => Plug-in Power Solutions->Non-Isolated->Single Posi |
| Description: | ti PT7748, 17Amp 'Current Booster' For The PT7720 Series |
| Company: | Texas Instruments, Inc. |
| Datasheet: | Download PT7748N datasheet File size : 146 kB |
| Request For quote: | Find where to buy PT7748N
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Datasheet text preview:
PT7720 Series
17A, 12-V Input "Big-Hammer II" Programmable ISR
-- Not Recommended for New Designs --
SLTS048B
(Revised 5/21/2002)
Features
· +12V Bus Input · 5-bit Programmable: 1.3V to 3.5V or 4.5V to 7.6V · High Efficiency · Differential Remote Sense · 27-pin SIP Package · Parallelable with PT7748 17A current booster
Description
The PT7720 series is a +12-V input, 17-A output, high-performance Integrated Switching Regulator (ISR), housed in a 27-pin SIP package. The 17A capability allows easy integration of the latest highspeed, low-voltage microprocessors and bus drivers into +12V power systems. The output voltage is programmable using a 5-bit code. The output voltage range and code for the PT7721 is compatible with Intel's Pentium II processor. The PT7720 series has been designed to work in parallel with one or more of the PT7748 current boosters, allowing the output load current capacity to be increased in increments of 17A. A differential remote sense is provided to compensate for voltage drop between the ISR to the load. A 1200µF of output capacitance is required for proper operation.
Ordering Information
PT7721 H PT7722 H PT7748 H = 1.3 to 3.5 Volts = 4.5 to 7.6 Volts = 17-A Booster
Pin-Out Information
Pin
1 2 3 4 5 6 7 8 9 10 11 12 13 14
Function
VID0 VID1 VID2 VID3 STBY # VID4 Vin Vin Vin Vin Vin Sense Gnd GND GND
Pin
15 16 17 18 19 20 21 22 23 24 25 26 27
Function
GND GND GND GND GND Vout Vout Vout Vout Vout Vout Sense Vout Sync Out
PT Series Suffix (PT1234 x )
Case/Pin Configuration Vertical Horizontal SMD Order Suffix Package Code * (EJE) (EJF) (EJG)
N A C
* Previously known as package styles 1000/ 1010. (Reference the applicable package code drawing for the dimensions and PC board layout)
# For further information, see application notes.
Standard Application
PROGRAMMING PINS
VID0 VID1 VID2 VID3 VID4 REMOTE SENSE (+)
64321 26
VIN
L1
7 - 11
1µH +
27
PT7720
13 - 19 5 12
20 - 25
V OUT
CIN SYNC OUT GND STBY*
COUT
+
LOAD
GND
REMOTE SENSE (-)
Cin = Required 560µF electrolytic (See input filter note) Co u t = Required 1200µF electrolytic L1 = Optional 1µH input choke
For technical support and more information, see inside back cover or visit www.ti.com
PT7720 Series
17 A, 12-V Input "Big-Hammer II" Programmable ISR
Programming Information
PT7721
VID3 VID2 VID1 VID0 1 1 1 1 1 1 1 0 1 1 0 1 1 1 0 0 1 0 1 1 1 0 1 0 1 0 0 1 1 0 0 0 0 1 1 1 0 1 1 0 0 1 0 1 0 1 0 0 0 0 1 1 0 0 1 0 0 0 0 1 0 0 0 0 VID4=1 Vout 2.0V 2.1V 2.2V 2.3V 2.4V 2.5V 2.6V 2.7V 2.8V 2.9V 3.0V 3.1V 3.2V 3.3V 3.4V 3.5V VID4=0 Vout 1.30V 1.35V 1.40V 1.45V 1.50V 1.55V 1.60V 1.65V 1.70V 1.75V 1.80V 1.85V 1.90V 1.95V 2.00V 2.05V
PT7722
VID4=1 Vout 4.5V 4.6V 4.7V 4.8V 4.9V 5.0V 5.1V 5.2V 5.3V 5.4V 5.5V 5.6V 5.7V 5.8V 5.9V 6.0V VID4=0 Vout 6.1V 6.2V 6.3V 6.4V 6.5V 6.6V 6.7V 6.8V 6.9V 7.0V 7.1V 7.2V 7.3V 7.4V 7.5V 7.6V
Logic 0 = Pin 12 potential (remote sense gnd) Logic 1 = Open circuit (no pull-up resistors) VID3 and VID4 may not be changed while the unit is operating.
Specifications
Characteristics Output Current Output Power
(Unless otherwise stated, Ta =25°C, V in =12V, Cin =560µF, C out =1200µF, and Io =Iomax)
PT7720 SERIES
Symbols Io Po V in Vo Reg line Reg load Vn t tr V os I o step between 7.5A and 15A V o over/undershoot I o = 10A Vo =5.0V Vo = 3.3V Vo = 2.5V Vo = 1.5V Conditions T a = +60°C, 200 LFM, pkg N, T a = +25°C, natural convection, T a = +60°C, 200 LFM, pkg N, T a = +25°C, natural convection, 0.1A Io 17A 0°C Ta +60°C 11V Vin 14V (with remote sense) 0.1 Io 17A (with remote sense) (PT7721) (PT7722) (PT7721) (PT7722) Vo 5V Vo 5V Vo 5V Vo 5V Min 0. 1 0. 1 -- -- 11.0 Vo 0.03 -- -- -- -- -- -- -- -- -- -- -- 300 0 -40 -- -- -- --
(1) (1)
Typ -- -- -- -- -- -- ±1 ±5 ±5 50 100 100 200 90 88 85 78 350 -- -- TBD TBD 53 66
Max 17 (2) 17 (2) 85 85 14.0 V o + 0.03 ±2 ±10 ±10 -- -- -- -- -- -- -- -- 400 +85 (3) +125 -- -- -- --
Units A W V V %Vo mV mV mVpp µSec mV %
Input Voltage Range Output Voltage Tolerance Line Regulation Load Regulation Vo Ripple/Noise Transient Response with Cout = 1200µF Efficiency
Switching Frequency Operating Temperature Range Storage Temperature Mechanical Shock Mechanical Vibration Weight
s Ta Ts
11V Vin 14V 0.1A Io 17A -- -- Per Mil-STD-883D, Method 2002.3 , 1 msec, Half Sine, mounted to a fixture Per Mil-STD-883D, Method 2007.2, 20-2000 Hz, Soldered in a PC board
kHz °C °C G's G's grams
--
Vertical Horizontal
Notes: (1) The ISR will operate down to no load with reduced specifications. Please note that this product is not short-circuit protected. (2) The PT7720 series can be easily paralleled with one or more of the PT7748 Current Boosters to provide increased output current in increments of 17A. (3) See Safe Operating Area curves or contact the factory for the appropriate derating. Output Capacitors: The PT7720 series requires a minimum output capacitance of 1200µF for proper operation. Do not use Oscon type capacitors. The maximum allowable output capacitance is (57,000 ÷ Vout)µF, or 15,000µF, whichever is less. Input Filter: An input inductor is optional for most applications. The input inductor must be sized to handle 7ADC with a typical value of 1µH. The input capacitance must be rated for a minimum of 4 Arms of ripple current when operated at maximum output current and maximum output voltage. Contact an applications specialist for input capacitor selection for applications at other output voltages and output currents.
For technical support and more information, see inside back cover or visit www.ti.com
PT7720 Series
17 A, 12-V Input "Big-Hammer II" Programmable ISR
Typical Characteristics
PT7721/PT7722 @Vin =12V
Efficiency vs Output Current
100
(See Note A)
Safe Operating Area, Vin=+12V
PT7721, Vout=+3.3V, Pkg N)
90
(See Note B)
Ambient Temperature (°C)
80 70 60 50 40 30 20
90
Efficiency (%)
Vo u t
Airflow
200LFM 120LFM 60LFM Nat conv
80 70 60 50 40 0 2 4 6 8 10 12 14 Output Current (A) 16 18 20
5.0V 3.3V 2.5V 1.5V
0
2
4
6
8
10
12
14
16
18
20
Output Current (A)
Output Ripple vs Output Current
16
Ambient Temperature (°C)
90 80 70 60 50 40 30 20
PT7722, Vout=+5.0V, Pkg N)
14
Ripple (mVpp)
12 10 8 6 4 2 0 0 2 4 6 8 10 12 14 16 18 20
Output Current (A)
Vo u t
5.0V 3.3V 2.5V 1.5V
Airflow
200LFM 120LFM 60LFM Nat conv
0
2
4
6
8
10
12
14
16
18
20
Output Current (A)
Power Dissipation vs Output Current
16 14 12
Pd (Watts)
Vo u t
5.0V 3.3V 2.5V 1.5V
10 8 6 4 2 0 0 2 4 6 8 10 12 14 16 18 20
Output Current (Amps)
Note A: Characteristic data has been developed from actual products tested at 25°C. This data is considered typical data for the Converter. 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
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