TEXAS INSTRUMENTS SLTS174A Technical data
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PT5810 Series
20-A 3.3-V Input Adjustable
Integrated Switching Regulator
Features
• 3.3 V Input
• 20 A Output Current
• DSP Compatible
• Low-Profile (8 mm)
• >90 % Efficiency
• Output Margin Control (±5 %)
• Adjustable Output Voltage
• Pre-Bias Startup Capability
Description
The PT5810 Excalibur™ series of integrated
switching regulators (ISRs) combines outstanding 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
a full 20 A 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 solderability and a small footprint (0.736 in² for suffix ‘N’).
Both through-hole and surface mount pin configurations are available.
The PT5810 series operates from a 3.3-V input
bus to provide 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 1.0 VDC.
Other features include external output voltage
adjustment, a ±5 % margin control, on/off inhibit,
short circuit protection, thermal shutdown, and a
differential remote sense.
SLTS174A - JANUARY 2003 - REVISED APRIL 2003
• On/Off Inhibit Function
• Over-Current Protection
• Thermal Shutdown
• Small Footprint
• Surface Mount Compatible
• IPC Lead Free 2
Ordering Information
PT5812H = 2.5 Volts
PT5813H = 1.8 Volts
PT5814H = 1.5 Volts
PT5815H = 1.2 Volts
PT5816H = 1.0 Volts
PT Series Suffix
Case/Pin Order Package
Configuration Suffix Code
Vertical N (EPP)
Horizontal A (EPQ)
SMD C (EPS)
(Reference the applicable package code drawing for the dimensions and PC board layout)
(PT1234x)
(0.736 in², Suffix ‘N’)
Pin-Out Information
Pin Function
1Vo Adjust
2 Inhibit*
3 Margin Dn*
4 Margin Up*
5V
in
6V
in
7V
in
8 Sense(–)
9 GND
10 GND
11 GND
12 GND
13 GND
14 V
out
15 V
out
16 V
out
17 V
out
18 Sense(+)
* Denotes negative logic:
Open = Normal operation
Ground = Function active
Standard Application
Margin Dn
Margin Up
Vo Adjust
V
IN
C
IN
1,000 µF
(Required)
Inhibit
GND
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+
4118
PT5800
9–13
Sense(+)
3
V
OUT
+
GND
L
O
A
D
Cin= Required 1,000 µF
C
= Required 330 µF
out
82
14–175, 6, 7
C
OUT
330 µF
(Required)
Sense(–)
PT5810 Series
20-A 3.3-V Input Adjustable
Integrated Switching Regulator
Specifications (Unless otherwise stated, T
=25 °C, Vin =3.3 V, V
a
=1.8 V, Cin =1,000 µF, C
out
out
SLTS174A - JANUARY 2003 - REVISED APRIL 2003
=330 µF, and Io =Iomax)
PT5810 SERIES
Characteristics Symbols Conditions Min Typ Max Units
Output Current I
Input Voltage Range V
o
in
Over Io range 2.95
0—20A
(1)
— 3.65 V
Set-Point Voltage Tolerance Vo tol — — ±2 %V
Temperature Variation ∆Reg
Line Regulation ∆Reg
Load Regulation ∆Reg
Total Output Variation ∆Reg
temp
line
load
tot
Efficiency η I
Vo Ripple (pk-pk) V
r
–40°C <Ta < +85 °C — ±0.5 — %V
Over Vin range — ±4 — mV
Over Io range — ±2 — mV
Includes set-point, line, load,
–40°C ≤ Ta ≤ +85 °C
=12 A PT5812 (2.5 V) — 93 —
o
PT5813 (1.8 V) — 90 —
PT5814 (1.5 V) — 89 —
PT5815 (1.2 V) — 87 —
PT5816 (1.0 V) — 84 —
——±3%V
20 MHz bandwidth — 20 — mVpp
Transient Response 1 A/µs load step, 50 to 100 % Iomax,
t
tr
∆V
Over-Current Threshold I
Output Voltage Adjust V
Switching Frequency ƒ
Inhibit Control (pin 2) Referenced to GND (pins 9–13)
Input High Voltage V
Input Low Voltage
Input Low Current
tr
TRIP
adj With Vo Adjust — ±15
o
s
IH
V
IL
I
IL
Reset, followed by auto-recovery — 30 — A
With Margin Up/Dn — ±5 —
Over Vin and Io ranges 250 300 350 kHz
Pin 2 to GND — –0.2 — mA
Recovery Time — 50 — µSec
Vo over/undershoot — 120 — mV
(2)
—
Vin –0.5 — Open
–0.2 — 0.6
(3)
Standby Input Current Iin standby Pin 2 to GND — 5 — mA
External Input Capacitance C
External Output Capacitance C
Operating Temperature Range T
in
out
a
Over Vin range –40
1,000
330
(4)
——µF
(5)
— 5,000 µF
(5)
— +85
(6)
Over-Temperature Protection OTP Measured at center of case, auto-reset — 110 — °C
Solder Reflow Temperature T
Storage Temperature T
reflow
s
Reliability MTBF Per Bellcore TR-332
Mechanical Shock Mil-STD-883D, Method 2002.3
Mechanical Vibration Mil-STD-883D, Method 2007.2,
Surface temprature of module pins or case — — 215
— -40 — +125 °C
50% stress, Ta =40°C, ground benign
Half Sine, mounted to a fixture
20-2000 Hz, PCB mounted
5.8 — — 10
— 500 — G’s
— 20
(8)
(7)
—G’s
Weight — — — 20 — grams
Flammability — Materials meet UL 94V-0
Notes:
(1) The minimum input voltage is equal to 2.95 V or Vout + 0.75 V, whichever is greater.
(2) This is a typical value. For the adjustment limits of a specific model consult the related application note on output voltage adjustment.
(3) The Inhibit control (pin 2) has an internal pull-upto V
leakage (<100nA) MOSFET is recommended to control this input. See application notes for more information.
(4) A 1,000 µF electrolytic input capacitor is required for proper operation. This capacitor must be rated for a minimumm of 0.7 Arms of ripple current.
(5) For operation below 0 °C, C
(6) See SOA curves or consult factory for the appropriate derating.
(7) During solder reflow of SMD package version do not elevate the module case, pins, or internal component temperatures above a peak of 215 °C. For
further guidance refer to the application note, “Reflow Soldering Requirements for Plug-in Power Surface Mount Products,” (SLTA051)
(8) The case pins on the through-hole package types (suffixes N & A) must be soldered. For more information see the applicable package outline drawing.
must have stable characteristics. Use either low-ESR tantalum or Oscon® type capacitors.
OUT
, and if left open-circuit the module will operate when input power is applied. A small low-
in
o
o
o
%
%
V
°C
°C
6
Hrs
For technical support and more information, see inside back cover or visit www.ti.com
PT5810 Series
)
20-A 3.3-V Input Adjustable
Integrated Switching Regulator
Pin Descriptions
Vin: The positive supply voltage input for the module
with respect to the common ground (GND).
Vout: This is the regulated output voltage from the module with respect to the common ground (GND).
GND: The common node to which the input, output, and
external control signals are referenced.
Sense(–): Provides the regulator with the ability to sense
the set-point voltage directly across the load. For optimum
output voltage accuracy this pin should
nected to GND, even for applications that demand a
relatively light load.
Sense(+): When used with Sense(–), the regulation circuitry
will compensate for voltage drop between the converter
and the load. The pin may be left open circuit, but connecting it to V
will optimize load regulation.
out
always be con-
SLTS174A - JANUARY 2003 - REVISED APRIL 2003
Inhibit*: This is an open-collector (open-drain) negative
logic input that is referenced to GND. Pulling this pin to
GND disables the module’s output voltage. If Inhibit* is
left open-circuit, the output will be active whenever a
valid input source is applied.
V
Adjust: This pin is used to trim the output voltage to a
o
value within the range of ±10 % of nominal. The adjustment method uses an external resistor. The resistor is
connected from V
Adjust to either the (-)Sense or (+)Sense,
o
in order to adjust the output up or down, respectively.
Margin Dn*: When this open-collector (open-drain) input
is asserted to GND, the output voltage is automatically
decreased by 5 % from the nominal. This feature is used
in applications where the load circuit must be tested for
operation at the extreme values of its supply voltage
tolerance.
Margin Up*: This is an open-collector (open-drain) input.
When this is asserted to GND, the output voltage is
automatically increased by 5 % from the nominal.
Typical Characteristics
Performance Data; Vin =3.3 V (See Note A)
Efficiency vs Output Current
100
90
80
70
Efficiency - %
60
50
0 4 8 121620
Output Ripple vs Output Current
60
50
40
30
Ripple - mV
20
10
0
0 5 10 15 20
Iout - Amps
Iout - Amps
PT5812
PT5813
PT5814
PT5815
PT5816
PT5814
PT5812
PT5813
PT5816
PT5815
Power Dissipation vs Output Current
6
5
4
3
Pd - Watts
2
1
0
048121620
Iout - Amps
Safe Operating Curves; Vin =3.3 V (See Note B)
90
80
70
60
50
40
Ambient Temperature (°C)
30
20
0 4 8 12 16 20
Iout (A
Airflow
200LFM
120LFM
60LFM
Nat Conv
Note A: Characteristic data has been developed from actual products tested at 25 °C. This data is considered typical data for the ISR.
Note B: SOA curves represent operating conditions at which internal components are at or below manufacturer’s maximum rated operating temperatures.
For technical support and more information, see inside back cover or visit www.ti.com
Application Notes
PT5800 & PT5810 Series
Operating Features and System Considerations
for the PT5800 & PT5810 Regulator Series
The PT5800 (5-V input) and the PT5810 (3.3-V input)
series of integrated switching regulators (ISRs) provide
step-down voltage conversion for output loads of up to
20 A.
Power up & Soft-Start Timing
Following either the application of a valid input source
voltage, or the removal of a ground signal to the Inhihit*
control pin (with input power applied), the regulator will
initiate a soft-start power up. The soft start slows the
rate at which the output voltage rises, and also introduces a
short time delay, td (approx. 2 ms). Figure 1-1 shows the
power-up characteristic of a PT5801 (3.3 V) with a 10-A
load.
Figure 1-1
Vo (2V/Div)
Vin (2V/Div)
With the sense leads connected, the difference between
the voltage measured at V
and GND pins, and that
out
measured from Sense(+) to Sense(–), is the amount of IR
drop being compensated by the regulator. This should
be limited to 0.6 V. (0.3 V maximum between pins 17 &
18, and also between pins 8 & 9).
Note: The remote sense feature is not designed to compensate
for the forward drop of non-linear or frequency dependent
components that may be placed in series with the converter
output. Examples include OR-ing diodes, filter inductors,
ferrite beads, and fuses. When these components are enclosed
by the remote sense connections they are effectively placed
inside the regulation control loop, which can adversely affect
the stability of the regulator.
Over-Current Protection
To protect against load faults, the regulators incorporate
output over-current protection. Applying a load that
exceeds the regulator’s over-current threshold (see data
sheet specifications) will cause the regulated output to
shut down. Following shutdown the ISR will periodically
attempt to recover by initiating a soft-start power-up.
This is often described as a “hiccup” mode of operation,
whereby the module continues in the cycle of successive
shutdown and power up until the load fault is removed.
During this period, the average current flowing into the
fault is significantly reduced. Once the fault is removed,
the converter automatically recovers and returns to normal operation.
t
d
HORIZ SCALE: 5ms/Div
Differential Remote Sense
Connecting the Sense(+) and Sense(-) pins to the load
circuit allows the regulator to compensate for limited
amounts of ‘IR’ voltage drop. This voltage drop is caused
by current flowing through the connection resistance
between the regulator and the ‘point of regulation’ some
distance away. Leaving the sense pins disconnected will
not damage the regulator or load circuitry. An internal
15 Ω resistor, connected between each sense pin and its
corresponding output node, keeps the output voltage in
regulation. However, it is important to connect Sense(–)
to GND locally, as this provides a return path for the
regulator’s internal bias currents.
Over-Temperature Protection
An on-board temperature sensor protects the module’s
internal circuitry against excessively high temperatures.
A rise in the internal temperature may be the result of a
drop in airflow, or a high ambient temperature. If the
internal temperature exceeds the OTP threshold (see
data sheet specifications), the regulator’s Inhibit* control
is automatically pulled low. This disables the regulator,
allowing the output voltage to drop to zero as the external output capacitors are discharged by the load circuit.
The recovery is automatic, and begins with a soft-start
power up. It occurs when the the sensed temperature
decreases by about 10 °C below the trip point.
Note: The over-temperature protection is a last resort mechanism to prevent thermal stress to the regulator. Operation at
or close to the thermal shutdown temperature is not recommended and will reduce the long-term reliability of the module.
Always operate the regulator within the specified Safe Operating
Area (SOA) limits for the worst-case conditions of ambient
temperature and airflow.
For technical support and more information, see inside back cover or visit www.ti.com
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