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Part: PT7761
Category:
Power Management
-> DC-DC Converters
-> Non-Isolated DC-DC Converters
Description:
Company: Texas Instruments, Inc.
Datasheet: Download PT7761 datasheet File size : 117 kB
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Datasheet text preview:
PT7761--5V
40-A Programmable Integrated Switching Regulator Module
SLTS152
(Revised 10/24/2001)
Features
· Single Device: 40ADC · +5V Input · 5-bit Programmable: 1.3V to 3.5V · 90% Efficiency · Differential Remote Sense · Short-Circuit Protection · Space-Saving Package · Solderable Copper Case · "Current Booster" Compatible · Shutdown Control
Description
The PT7761 is a high performance integrated switching regulator (ISR), housed in a solderable, 31-pin spaces a v i n g copper package. Operating fr om and input voltage of +5V, the PT7761 provides up to 40A of lowvoltage power for the industry's latest DSPs, and µ-Processors. The PT7761 performance extends both the flexibility and output current range of the "Big Hammer" series of Plug-in Power modules, and provides a state-of-the-art solution for highly integrated digital systems that demand high power supply currents at low output voltages. The PT7761 is programmable from 1.3V to 3.5V via a 5-bit input, which is compatible with Intel's Pentium® series microprocessors. The PT7761's features include a momentary-interrupt style of shortcircuit protection, a standby control, and a differential remote sense to compensate for voltage drop between the ISR and load. For additional output current the PT7761 can operate with up to three current boosters.
Ordering Information
PT7761o = 1.3 to 3.5V Regulator * PT7769o = 40-A Current Booster
* Consult application notes for information on Current Booster operation
PT Series Suffix (PT1234 x )
Case/Pin Configuration Vertical Horizontal SMD Order Suffix Package Code (EKH) (EKF) (EKG)
N A C
(Reference the applicable package code drawing for the dimensions and PC board layout)
Standard Application
PROGRAMMING PINS
VID0 VID1 VID2 VID3 VID4
REMOTE SENSE(+) 5 4 3 2 1 31
L IN V IN 1 µH
+
914
PT7761
7 6 1622 15
2330
VOUT
C IN SYNC OUT GND STBY*
+
C OUT GND
REMOTE SENSE()
L O A D
Cin = Required 1500µF electrolytic Cout = Required 330µF electrolytic Lin = Optional 1µH input choke
For technical support and more information, see inside back cover or visit www.ti.com
PT7761--5V
40-A Programmable Integrated Switching Regulator Module
Programming Information
VID3 VID2 VID1 VID0
1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0
Pin-Out Information
Pin Function
1 2 3 4 5 6 7 8 9 10 VID0 VID1 VID2 VID3 VID4 STBY * Sync No Connect Vi n Vi n
VID4=1 VID4=0 Vout 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 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
Pin Function
11 12 13 14 15 16 17 18 19 20 Vin Vin Vin Vin Rem Sense GND GND GND GND GND GND
2
Pin Function
21 22 23 24 25 26 27 28 29 30 31 GND GND Vout Vout Vout Vout Vout Vout Vout Vout Rem Sense V out
* For STBY* pin: Open =Output Enabled Ground =Output Disabled
Logic 0 = Pin 15 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
(Unless otherwise stated, T a =25°C, C in =1,500µF, C out =330µF, V in =5V, V o =3.3V, & Io =Iomax)
PT7761
Symbols Io Vi n Votol R e g temp R e g l i n e R e gl o a d Votol Conditions T a =25°C, Natural convection T a =60°C, 200LFM, Pkg N Over I o range All output voltages 40°C Ta 85°C, Io =Io min Over V in range Over load range Includes set-point, line, load, 40°C Ta +85°C I o =20A I o =40A Vo Ripple (pk-pk) Transient Response Short Circuit Threshold Switching Frequency Standby Control (pin 6) Input High Voltage Input Low Voltage Input Low Current Quiescent Current External Output Capacitance Operating Temperature Range Storage Temperature Mechanical Shock Mechanical Vibration Mil-STD-883D, 20-2000 Hz Weight Flammability -- -- Vr t tr Vtr Is c ( p k ) s V IH V IL IIL Iin stby Cout Ta Ts 20MHz bandwidth 1A/µs load step from 50% to 100% I omax V o over/undershoot Reset and auto-recovery Over V in and Io ranges Referenced to GND (pins 1622) Pin 6 to GND Pin 6 to GND Between +V o and GND Over V in Range -- Mil-STD-883D, Method 2002.3 1 msec, Half Sine, mounted to a fixture Vertical Horizontal Ver tical/Horizontal Materials meet UL 94V-0 Vo = 3.3V Vo = 2.5V Vo = 1.8V Vo = 3.3V Vo = 2.5V Vo = 1.8V Min 0. 1 0.1 4. 5 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 300 2 -0.2 -- -- 330 40 -40 -- -- -- --
(4) (1) (1)
Typ -- -- -- -- ±0.75 ±5 ±5 ±1 90 89 83 86 85 80 50 50 100 75 350 -- -- 0.4 30 -- -- -- TBD TBD (6) TBD (6) 55
Max 40 38 5.5 ±25 -- -- -- ±3 -- -- -- -- -- -- -- -- -- -- 400 Open (3) 0.8 -- -- 30,000 +85 (5) +125 -- -- -- --
(2)
Units A V mV %Vo mV mV %Vo %
Input Voltage Range Set-Point Voltage Tolerance Temperature Variation Line Regulation Load Regulation Total Output Variation Efficiency
% mV µSec mV A kHz V mA mA µF °C °C G's G's grams
Notes: ( 1 ) (2) (3) (4) (5) (6)
ISR-will operate down to no load with reduced specifications. If the Remote Sense Ground (Pin 15) is not used, it must be connected to pin 16 for optimum output voltage accuracy. The Standby control (pin 6) has an internal pull-up, and if left open-circuit the module will operate when input power is applied. For operation below 0°C, Cin and Cout must have stable characteristics. Use either low ESR tantalum or Oscon® capacitors. See safe Operating Area curves or consult factory for the appropriate derating. The case pins on the through-hole package types (suffixes N & A) must be soldered. For more information see the applicable package outline drawing.
External Capacitors: The PT7761 series requires a minimum ouput capacitance of 330µF for proper operation. The PT7761 also requires a minimum input capacitance of 1,500µF, which must be rated for a minimum of 1.4Arms of ripple current. For transient or dynamic load applications, additional capacitance may be required. For further information refer to the application note regarding capacitor selection for this product. Input Inductor: An input inductor is optional for most applications. The input inductor must be sized to handle 30ADC with a typical value of 1µH.
For technical support and more information, see inside back cover or visit www.ti.com
PT7761--5V
40-A Programmable Integrated Switching Regulator Module
Typical Characteristics
Characteristic Data, VIN =5VDC
Efficiency vs. Output Current
100
(See Note A)
Safe Operating Area Curves
PT7761 @Vin =5V
(See Note B)
90 80
90
Ambient Temperature (°C)
Efficiency - %
VOUT
80
70 60 50 40 30
Air flow 400LFM 200LFM Nat conv
70
3.3V 2.5V 1.8V
60
50 0 8 16 24 32 40
20 0 8 16 24 32 40
Iout (A)
Iout (A)
Ripple Voltage vs. Output Current
60 50
Ripple - mV
40
VOUT 2.5V 1.8V 3.3V
30
20
10
0 0 8 16 24 32 40
Iout (A)
Power Dissipation vs. Output Current
20
16
VOUT Pd - Watts
12
8
3.3V 2.5V 1.8V
4
0 0 8 16 24 32 40
Iout (A)
Note A: Note B:
Characteristic data in the above graphs has been developed from actual products tested at 25°C. This data is considered typcial for the ISR. SOA curves represent conditions at which internal components are at or below manufacturer's maximum operating temperatures.
For technical support and more information, see inside back cover or visit www.ti.com
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