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7746C

Part # 7746C
Description
Category CONVERTER
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LAMBDA CORP.
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Technical Document


DISCLAIMER: The information provided herein is solely for informational purposes. Customers must be aware of the suitability of this product for their application, and consider that variable factors such as Manufacturer, Product Category, Date Codes, Pictures and Descriptions may differ from available inventory.

For technical support and more information, see inside back cover or visit www.ti.com/powertrends
Features
The PT7746 is a high-output 32 Amp
“Current Booster” for the PT7770 series
housed in a 27-pin SIP package.
Multiple PT7746 boosters will operate
in parallel with any of the PT7770 series
products, boosting output current in incre-
ments of 32A. Combinations of a PT7770
series regulator and PT7746 current boost-
ers can supply enough power for virtually
any multiple mega-processor application.
A PT7746 current booster adds a paral-
lel output stage that is driven from the
regulator. As such, the system runs in per-
fect sychronization providing a low noise
solution.
The PT7746 only operates in combina-
tion with a PT7770 series regulator and is
not a stand-alone product. Please refer to
the PT7771, PT7772, or PT7777 series
data sheet for performance specifications.
The PT7746 has the same mechanical
outline and package options as the PT7770
series.
PT7746—5V/3.3V
32 Amp “Current Booster” for
PT7770 Series Regulators
Ordering Information
PT7746
32A Current Boost
Tracks Vo of a PT7770
High Efficiency
Input Voltage Range:
3V to 5.5V
Synchronized with PT7770
27-pin SIP Package
Run up to 2 in Parallel -
96 Amps
Standard Application
(For dimensions and PC Board layout, see
Package Styles 1020 and 1030.)
Pin-Out Information
Pin Function
1 Do not connect
2 Do not connect
3 Do not connect
4 Do not connect
5 Do not connect
6 Do not connect
7V
in
8V
in
9V
in
10 V
in
11 V
in
12 Do not connect
13 GND
Pin Function
14 GND
15 GND
16 GND
17 GND
18 GND
19 GND
20 V
out
21 V
out
22 V
out
23 V
out
24 V
out
25 V
out
26 Do not connect
27 Master Sync In
PT7746
PT7770
7 - 11
13 - 19
20 - 25
27
GND GND
V
OUT
12
261
REMOTE SENSE (+)
REMOTE SENSE (-)
VID0
VID1
VID2
VID3
PROGRAMMING PINS
234
STBY*
5
C
IN
+
C
IN
+
C
OUT
+
C
OUT
+
LOAD
7 - 11 20 - 25
13 - 19
27
1H
L1
1H
L1
V
IN
6
VID4
PT Series Suffix
(PT1234X)
Case/Pin
Configuration
Vertical Through-Hole
N
Horizontal Through-Hole
A
Horizontal Surface Mount
C
Output Capacitors:
When used with a PT7771 or PT7772, the PT7746 requires a minimum ouput capacitance of 2400µF. When used with a PT7777, the
PT7746 requires a minimum ouput capacitance of 680µF 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 capacitance may be required.
SLTS049A
(Revised 6/30/2000)
When used with PT7771/7772:
C
in
= Required 2400µF electrolytic
C
out
= Required 2400µF electrolytic
L1 = Optional 1µH input choke
When used with PT7777:
C
in
= Required 2400µF electrolytic
C
out
= Required 680µF electrolytic
L1 = Optional 1µH input choke
PACKAGE OPTION ADDENDUM
www.ti.com
20-Aug-2011
Addendum-Page 1
PACKAGING INFORMATION
Orderable Device
Status
(1)
Package Type Package
Drawing
Pins Package Qty
Eco Plan
(2)
Lead/
Ball Finish
MSL Peak Temp
(3)
Samples
(Requires Login)
PT7746C NRND SIP MODULE EJC 27 TBD Call TI Call TI
PT7746N NRND SIP MODULE EJD 27 TBD Call TI Call TI
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability
information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that
lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between
the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight
in homogeneous material)
(3)
MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.
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