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Part: PT7770
Category:
Description: 32 Amp High-performance Sledge Hammer Programmable Isr
Company: Texas Instruments, Inc.
Datasheet: Download PT7770 datasheet File size : 117 kB
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For assistance or to order, call
(800) 531-5782
PT7770
Series
32 AMP HIGH-PERFORMANCE "SLEDGE HAMMER" PROGRAMMABLE ISR
The PT7770 is a new series of high-performance, 32 Amp Integrated Switching Regulators (ISRs) housed in a 27-pin SIP package. The 32A capability allows easy integration of the latest high-speed, low-voltage µPs, ASICs, DSPs, and bus drivers into existing 5V systems. The output voltage of the PT7770 can be easily programmed
Application Notes Mechanical Outline Product Selector Guide Revised 5/15/98
from 1.3V to 3.5V with a 5 bit input compatible with Intel's Pentium® Pro Processor. A differential remote sense is also provided which automatically compensates for any voltage drop from the ISR to the load. 2400µF of output capacitance are required for proper operation.
Pin-Out Information Standard Application
PROGRAMMING PINS
VID0 VID1 VID2 VID3 VID4 REMOTE SENSE (+)
64321 26
VIN
L1
7 - 11
1µH +
27
PT7770
13 - 19 5 12
20 - 25
VOUT
CIN SYNC OUT GND STBY*
COUT
+
LOAD
GND
REMOTE SENSE (-)
Pin Function 1 VID0 2 VID1 3 VID2 4 VID3 5 S T B Y * - Stand-by 6 VID4 7 Vin 8 Vin 9 Vin 1 0 Vin 1 1 Vin 1 2 Remote Sense Gnd 1 3 GND
C i n = Required 2400µF electrolytic C o u t = Required 2400µF electrolytic L 1 = Optional 1µH input choke
Pin Function 1 4 GND 1 5 GND 1 6 GND 1 7 GND 1 8 GND 1 9 GND 2 0 Vout 2 1 Vout 2 2 Vout 2 3 Vout 2 4 Vout 2 5 Vout 2 6 Remote Sense Vout 2 7 Sync Out
For STBY* pin; open = output enabled; g r o u n d = output disabled.
Specifications
Characteristics (T a = 25°C unless noted) O u t p u t Current I n p u t Voltage Range O u t p u t Voltage Tolerance L i n e Regulation L o a d Regulation V o Ripple/Noise pk-pk Tr a n s i e n t Response with Cout = 2400µF Efficiency S w i t c h i n g Frequency A b s o l u t e Maximum O p e r a t i n g Temperature Range R e c o m m e n d e d Operating Te m p e r a t u r e Range S t o r a g e Temperature We i g h t
PT7770 SERIES
Symbols Io Vin Vo R e gline R e gload Vn ttr Vos o Ta Ta Ts -- Conditions Ta = +60°C, 200 LFM, pkg N Ta = +25°C, natural convection 0.1A Io 32A Vin = +5V, Io = 32A 0°C Ta +55°C 4.5V Vin 5.5V, Io = 32A Vin = +5V, 0.1 Io 32A Vin = +5V, Io = 32A Io step between 16A and 32A V o over/undershoot Vin = +5V, Io = 20A, Vo = 3.3V 4.5V Vin 5.5V 0.1A Io 32A -- Forced Air Flow = 200 LFM Over Vin and Io Ranges -- Ve r t i c a l / H o r i z o n t a l Min 0 . 1 (1) 0 . 1 (1) 4 . 5 (2) Vo - 0.03 -- -- -- -- -- -- 650 0 0 -40 -- Typ -- -- -- -- ±10 ±10 50 100 200 90 700 -- -- -- 53/66 Max 32 26 5.5 Vo + 0.03 -- -- -- -- -- -- 750 +85 +65 +125 -- Units A A V V mV mV mV µSec mV % kHz °C °C °C grams
(1) ISR-will operate down to no load with reduced specifications. Please note that this product is not short-circuit protected. (2) The minimum input voltage is 4.5V or Vout+1.2V, whichever is greater.
Output Capacitors: The PT7770 series requires a minimum output capacitance of 2400µF for proper operation. Do not use Oscon type capacitors. The maximum allowable output capacitance is 30,000µF. Input Filter: An input filter is optional for most applications. The input inductor must be sized to handle 32ADC with a typical value of 1µH. The input capacitance must be rated for a minimum of 2.6Arms of ripple current. For transient or dynamic load applications, additional c a p a c i t a n c e may be required.
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Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 (800) 531-5782 Fax: (630) 393-6902 http://www.powertrends.com
For assistance or to order, call
(800) 531-5782
PT7770
Features
· +5V input · 5-bit Programmable: 1.3V to 3.5V@32A · High Efficiency · Input Voltage Range: 4.5V to 5.5V · Differential Remote Sense · 27-pin SIP Package
Series
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
Ordering Information
PT7771t = 1.3 to 3.5 Volts
F o r dimensions and PC board layout, s e e Package Style 1020 and 1030
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
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
DATA SHEETS
5V Bus Products
PT Series Suffix (PT1234X)
Case/Pin Configuration
Vertical Through-Hole Horizontal Through-Hole Horizontal Surface Mount
N A C
L o g i c 0 = Pin 12 potential (remote sense gnd) L o g i c 1 = Open circuit (no pull-up resistors) VID3 and VID4 may not be changed while the unit is operating.
CHARACTERISTIC DATA
Efficiency vs Output Current (@Vout=+3.3V)
100
Safe Operating Area (@Vin=+5V, Vout=+3.3V, Pkg N)
90
Temperatur A m b i e n t Te m p e r a t u r e (°C)
80
E f f i c i e n c y (%)
90
Vin
4.5V 5.0V 5.5V
70
Recommended Maximum Operating Temperature
Airflow
Nat. Conv 60 LFM 120 LFM 200 LFM
60
80
50
40
70
30
60 0 4 8 12 16 20 24 28 32
20 0 4 8 12 16 20 24 28 32
O u t p u t Current (A)
O u t p u t Current (A)
N o t e : SOA curves represent operating conditions at w h i c h internal components are at or below manufacturer's m a x i m u m rated operating temperatures.
Power Dissipation vs Output Current (@Vout=+3.3V)
20 18 16 14 12 10 8 6 4 2 0 0 4 8 12 16 20 24 28 32
Vin
4.5V 5.0V 5.5V
(Watts) P d (Wa t t s )
O u t p u t Current (A)
Output Ripple vs Output Current (@Vout=+3.3V)
40 35 30
Vin
4.5V 5.0V 5.5V
R i p p l e (mVpp)
25 20 15 10 5 0 0 4 8 12 16 20 24 28 32
O u t p u t Current (A)
Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 (800) 531-5782 Fax: (630) 393-6902 http://www.powertrends.com
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Copyright © 1999, Texas Instruments Incorporated
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