PT7711 Datasheet, PDF (1/9 Pages) Texas Instruments – 20-A Programmable Integrated Switching Regulator

PT7711—5V
20-A Programmable
Integrated Switching Regulator
SLTS087A
(Revised 6/27/2002)
Features
• 5V Input Voltage
• 20-A Output Current
• 5-bit Programmable Output:
1.3V to 3.5V
• High Efficiency (93%)
• Differential Remote Sense
• Over-Current Protection
• 27-Pin Space-Saving Package
• Solderable Copper Case
• Compatible with PT7745
20A “Current Booster”
Description
The PT7711 Excalibur™ power module
is a 20-A integrated switching regula-
tor (ISR) housed a 27-pin space-saving
copper package. Operating from a +5V
input bus, the PT7711 produces a tightly
regulated output voltage that is program-
mable over the range, 1.3V to 3.5V. The
output voltage is selected via 5-bit input
code, which is compatible with the VRM
specifications defined by Intel®.
This regulator is most suitable for
microprocessor and DSP applications
requiring core or I/O logic supply volt-
ages as low as 1.3V.
The PT7711 regulator incorporates
output short-circuit protection, and a
differential remote sense to compensate
for voltage drop between the regulator
and load.
Ordering Information
PT7711o = 1.3 to 3.5 Volts
PT7745o = 20-A Booster *
* Consult the related application note for
information on current booster operation.
PT Series Suffix (PT1234 x )
Case/Pin
Order
Configuration Suffix
Vertical
N
Horizontal A
SMD
C
Package
Code †
(ENE)
(ENF)
(ENG)
† Previously known as package styles
1420 & 1430
(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 Rem 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 Rem Sense V_out
27 Sync Out
For STBY* pin: open =output enabled
ground =output disabled.
Standard Application
VID0
VID1
VID2
VID3
VID4
V _IN
PROGRAMMING PINS
REMOTE SENSE(+)
64321
26
L1
7-11
PT7711
20-25
1µH
V_OUT
SYNC OUT
GND
+
C _IN
27 5 13-19 12
+
C_OUT
L
O
A
D
GND
STBY*
REMOTE SENSE(–)
Cin = Required 1500µF electrolytic
Cout = Required 330µF electrolytic
L1 = Optional 1µH input choke
For technical support and more information, see inside back cover or visit www.ti.com