For technical support and more information, see inside back cover or visit www.ti.com/powertrends
The PT4498 is a new high-performance
20A “Current Booster” for use with the
PT4484 Excalibur™ DC/DC converter.
The PT4498 adds a parallel output stage
to the PT4484, allowing both to operate
in perfect sychronization.
The PT4498 only operates with a
PT4484 and is not a stand-alone product.
Refer the PT4484 data sheet for the perfor-
mance specifications. The booster uses the
same 26-pin case and has the package op-
tions as the companion regulator.
PT4498—48V
20 Amp “Current Booster for
PT4484 DC/DC Converter
Ordering Information
PT4498
o
20A Current Boost
(Boosts PT4484 to 40A)
Tracks Vout of PT4484
Synchronized Operation
High Efficiency
Input Voltage: 36V to 75V
26-pin Copper Case Package
Standard Application
(For dimensions and PC Board layout, see
Package Styles 1200, 1210 and 1215.)
Pin-Out Information
Pin Function
1+V
in
2-V
in
3 N/C
4V
r
5V
a
6 N/C
7 N/C
8+V
out
9+V
out
Pin Function
10 +Vout
11 +Vout
12 +Vout
13 +Vout
14 -Vout
15 -Vout
16 -Vout
17 -Vout
18 -Vout
PT4498
PT4484
1
2
8 - 13
-V
IN
-V
OUT
+V
OUT
20
7
REMOTE SENSE (+)
REMOTE SENSE (-)
Inhibit
3
C
IN
+
C
IN
+C
OUT
+
LOAD
18 - 13
14 - 19
+V
IN
14-19
2
4526
204526
VID1
VID2
VID3
PROGRAMMING PINS
25
VID4
24 23 22
PT Series Suffix (PT1234X)
Case/Pin
Configuration
Vertical Through-Hole
N
Horizontal Through-Hole
A
Horizontal Surface Mount
C
SLTS110
(Revised 10/31/2000)
Input Capacitors:
Although not necessary for stable operation, Cin will reduce input ripple. Cin = 33µF is suggested.
Output Capacitors:
A minimum of 330µF per PT4498 booster module is required for proper operation. Increasing Cout will reduce transients due to large and/or fast
load steps.
Patent pending on package assembly
Pin Function
19 -Vout
20 -Vsense
21 N/C
22 N/C
23 N/C
24 N/C
25 N/C
26 DRV
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