PT7720_13 Datasheet, PDF (1/8 Pages) Texas Instruments – High Efficiency

PT7720 Series
17A, 12-V Input “Big-Hammer II”
Programmable ISR
— Not Recommended for New Designs —
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
SLTS048B
(Revised 5/21/2002)
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 high-
speed, 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 com-
patible 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
PT7721H
PT7722H
PT7748H
= 1.3 to 3.5 Volts
= 4.5 to 7.6 Volts
= 17-A Booster
PT Series Suffix (PT1234 x )
Case/Pin
Configuration
Vertical
Horizontal
SMD
Order
Suffix
N
A
C
Package
Code *
(EJE)
(EJF)
(EJG)
* Previously known as package styles 1000/
1010. (Reference the applicable package code
drawing for the dimensions and PC board
layout)
Pin-Out Information
Pin Function
1 VID0
2 VID1
3 VID2
4 VID3
5 STBY #
6 VID4
7 Vin
8 Vin
9 Vin
10 Vin
11 Vin
12 Sense Gnd
13 GND
14 GND
Pin Function
15 GND
16 GND
17 GND
18 GND
19 GND
20 Vout
21 Vout
22 Vout
23 Vout
24 Vout
25 Vout
26 Sense Vout
27 Sync Out
# For further information, see application
notes.
Standard Application
PROGRAMMING PINS
VID0
VID1
VID2
VID3
VID4
V_IN
L1
1µH
SYNC OUT
GND
STBY*
+
C_IN
6432 1
26
7 - 11 _PT7720
REMOTE SENSE (+)
20 - 25
V_OUT
27 13 - 19 5 12
+
C_OUT
LOAD
GND
REMOTE SENSE (-)
Cin = Required 560µF electrolytic
(See input filter note)
Cout = Required 1200µF electrolytic
L₁ = Optional 1µH input choke
For technical support and more information, see inside back cover or visit www.ti.com