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PDF PT5806 Data sheet ( Hoja de datos )
| Número de pieza | PT5806 | |
| Descripción | 18-A 5-V Input Adjustable Integrated Switching Regulator | |
| Fabricantes | ETC | |
| Logotipo |  |
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PT5800 Series
18-A 5-V Input Adjustable
Integrated Switching Regulator
SLTS171A JANUARY 2003 - REVISED - MARCH 2003
Features
• 5V Input
• 18A Output Current
• DSP Compatible
• Low-Profile (8mm)
• >90% Efficiency
• Output Margin Control (±5%)
• Adjustable Output Voltage
• On/Off Inhibit Function
• Pre-Bias Startup Capability
• Over-Current Protection
• Over-Temperature Protection
• Small Footprint
(0.736 in², Suffix ‘N’)
• Surface Mount Compatible
• IPC Lead Free 2
Description
The PT5800 Excalibur™ series of integrated
switching regulators (ISRs) combines outstand-
ing power density with a comprehensive list of
features. They are an ideal choice for applications
where board space is a premium and performance
cannot be compromised. These modules provide
18A of output current, yet are housed in a low-
profile, 18-pin package that is almost half the
size of the previous product generation. The
integral copper case construction requires no
heatsink, and offers the advantages of solderabil-
ity and a small footprint (0.736 in² for suffix ‘N’).
Both through-hole and surface mount pin con-
figurations are available.
The PT5800 series operates from a 5-V input
bus and provides a convenient point-of-load power
source for the industry’s latest high-performance
DSPs and microprocessors. The series includes
output voltage options as low as 1.0VDC.
Other features include external output voltage
adjustment, a ±5% margin control, on/off inhibit,
short circuit protection, thermal shutdown, and a
differential remote sense.
Standard Application
Ordering Information
PT5801H = 3.3 Volts
PT5802H = 2.5 Volts
PT5803H = 1.8 Volts
PT5804H = 1.5 Volts
PT5805H = 1.2 Volts
PT5806H = 1.0 Volts
PT Series Suffix (PT1234 x )
Case/Pin
Configuration
Order
Suffix
Package
Code
Vertical
Horizontal
N (EPP)
A (EPQ)
SMD
C (EPS)
(Reference the applicable package code draw-
ing for the dimensions and PC board layout)
Pin-Out Information
Pin Function
1 Vo Adjust
2 Inhibit*
3 Margin Dn*
4 Margin Up*
5 Vin
6 Vin
7 Vin
8 Sense(–)
9 GND
10 GND
11 GND
12 GND
13 GND
14 Vout
15 Vout
16 Vout
17 Vout
18 Sense(+)
* Denotes negative logic:
Open = Normal operation
Ground = Function active
Margin Dn
Margin Up
Vo Adjust
VIN 5, 6, 7
CIN
820µF
(Required)
Inhibit
GND
Sense(+)
1
43
18
PT5800
14–17
2 9–13 8 COUT
330µF
(Required)
Sense(–)
VOUT
L
O
A
D
GND
Cin = Required 820µF
Cout = Required 330µF
For technical support and more information, see inside back cover or visit www.ti.com
1 page  
Application Notes
PT5800 & PT5810 Series
Startup of the PT5800 & PT5810 Series ISRs
with Back-Feeding Source (Pre-Bias Capability)
In complex digital systems an external voltage can
sometimes be present at the output of the regulator
during power up. For example, this voltage may be
backfed through a dual-supply logic component such as
an FPGA or ASIC. Another path might be via a clamp
diode (to a lower supply voltage) as part of a power-up
sequencing implementation.
Although the PT5800 (5-V input) and PT5810 (3.3-V
input) series of regulators will sink current under steady-
state operating conditions, they will not do so during
startup 1 as long as certain conditions are maintained 2.
This feature allows these regulators to start up while an
external voltage is simultaneously applied to the output.
Figure 2-1 is an application schematic that demonstrates
this capability. The waveforms in Figure 2-2 show the
behavior of the circuit as input power is applied. Note
that the plot of the regulator output current (Io) is approxi-
mately zero up to the timestamp ‘A’, even though a voltage
is initially backfed to the output via the 3.3-V input supply
and diodes D1 & D2. The regulator sources current 3 when
it begins raising the output above the back-fed voltage to
its nominal regulation value.
Notes
1. Startup includes both the application of a valid input
source voltage, or the removal of a ground signal from
the Inhibit* control (pin 2) with a valid input source
applied. The output of the regulator is effectively off
(tri-state), during the period that the Inhibit* control is
held low.
2. To ensure that the regulator does not sink current, the
input voltage must always be greater or equal to the
output voltage throughout the power-up and power-down
sequence.
3. If an external source backfeeding the regulator’s output
is greater than the nominal regulation voltage, the output
will begin sinking current at the end of its soft-start
power-up sequence. If this current exceeds the rated
output, the module could be overstressed.
Figure 2-2; Power-up Waveforms with Back-Feeding Source
Vin (1V/Div)
Vo (1V/Div)
Io (5A/Div)
HORIZ SCALE 5ms/Div
A
Figure 2-1; Schematic Demonstrating Startup into Pre-Bias Capability
VIN
CIN
COM
(3.3VDC)
5–7 VIN
18
Sense(+)
PT5812 VOUT 14–17
GND Sense(–)
9–13 8
Cout
D1
D2
VO (2.5V)
Io
COM
For technical support and more information, see inside back cover or visit www.ti.com
5 Page 
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Post Office Box 655303
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Copyright 2003, Texas Instruments Incorporated
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet PT5806.PDF ] | |
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