PT5826N [TI]
16A SWITCHING REGULATOR, 400kHz SWITCHING FREQ-MAX, MSMA18;型号: | PT5826N |
厂家: | TEXAS INSTRUMENTS |
描述: | 16A SWITCHING REGULATOR, 400kHz SWITCHING FREQ-MAX, MSMA18 开关 |
文件: | 总11页 (文件大小:195K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
PT5820 Series
16-A 12-V Input Adjustable
Integrated Switching Regulator
SLTS172
(Released 8/23/2002)
Features
• 12V Input
• Thermal Shutdown
• DSP Compatible
• Low-Profile (8mm)
• Small Footprint
• High Efficiency (90+%)
• Output Margin Control ( 5%)
• Adjustable Output Voltage
• On/Off Enable Function
• Over-Current Protection
(0.736 in², Suffix ‘N’)
• Solderable Copper Case
• Surface Mount Compatible
Description
Pin-Out Information
Ordering Information
Pin Function
PT 5827r = 5.0 Volts
PT 5821r = 3.3 Volts
PT 5822r = 2.5 Volts
PT 5823r = 1.8 Volts
PT 5824r = 1.5 Volts
PT 5825r = 1.2 Volts
PT 5826r = 1.0 Volts
The PT5820 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
a full 16A of output current, yet are housed in a
low-profile, 18-pin, package. The integral copper
case construction requires no heatsink, and offers
the advantages of solderability and a small foot-
print (0.736 in² for suffix ‘N’). Both through-hole
and surface mount pin configurations are available.
The PT5820 series operates from a 12-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.
1
2
3
Vo Adjust
Inhibit *
Margin Down
Margin Up
Vin
4
5
6
Vin
7
Vin
8
Sense(–)
GND
GND
GND
GND
GND
Vout
PT Series Suffix
(PT1234x)
9
Case/Pin
Configuration
O rder
Suffix
Package
10
11
12
13
14
15
16
17
18
Code
Vertical
Horizontal
SMD
N
A
C
(EPP)
(EPQ)
(EPS)
(Reference the applicable package code draw-
ing for the dimensions and PC board layout)
Vout
Vout
Vout
Other features include external output voltage
adjustment, a 5% margin control, on/off enable,
short circuit protection, and thermal shutdown. A
560-µF input capacitor and 330µF output capacitor
are required for proper operation.
Sense(+)
* For Inhibit pin:
Open = output enabled
Ground = output disabled
Standard Application
Margin Down
Margin Up
Vo Adjust
Sense(+)
1
4
3
18
VOUT
5, 6, 7
14–17
VIN
PT5820
+
+
2
9–13
8
CIN
COUT
L
O
A
D
560µF
(Required)
330µF
(Required)
Sense(–)
Inhibit
GND
GND
Cin = Required 560µF
Cout = Required 330µF (Note 3)
For technical support and more information, see inside back cover or visit www.ti.com
PT5820 Series
16-A 12-V Input Adjustable
Integrated Switching Regulator
Performance Specifications (Unless otherwise stated, Ta =25°C, Vin =12V, Cin =560µF, Cout =330µF, and Io =Iomax)
PT5820 Series
Typ
Characteristics
Symbols
Conditions
Min
Max
Units
Output Current
Io
Vin
0
—
—
—
0.5
6
16
13.2
2
—
—
—
A
V
%Vo
%Vo
mV
mV
Input Voltage Range
Set-Point Voltage Tolerance
Temperature Variation
Line Regulation
Load Regulation
Total Output Variation
Over Io range
10.8
—
—
—
—
Vo tol
∆Regtemp
∆Regline
∆Regload
∆Regtot
–40°C <Ta < +85°C
Over Vin range
Over Io range
12
Includes set-point, line, load,
—
—
3
%Vo
–40°C ≤ Ta ≤ +85°C
Efficiency
η
PT5827 (5.0V)
PT5821 (3.3V)
PT5822 (2.5V)
PT5823 (1.8V)
PT5824 (1.5V)
PT5825 (1.2V)
PT5826 (1.0V)
—
—
—
—
—
—
—
93
90
88
84
82
80
77
—
—
—
—
—
—
—
%
Vo Ripple (pk-pk)
Vr
20MHz bandwidth
—
20
—
mVpp
Transient Response
1A/µs load step, 50% to 100% Iomax,
Recovery Time
Vo over/undershoot
ttr
—
—
50
70
—
—
µSec
mV
∆Vtr
Over-Current Threshold
Output Voltage Adjust
ITRIP
Vo adj
Reset, followed by auto-recovery
—
—
—
22
—
—
—
A
with Vo Adjust
10
%
with Margin Up/Down
5
Switching Frequency
ƒs
Over Vin and Io ranges
300
350
400
kHz
Inhibit Control (pin 2)
Input High Voltage
Input Low Voltage
Referenced to GND (pins 9–13)
(1)
VIH
VIL
IIL
Vin –0.5
–0.2
—
—
—
—
–0.5
2
—
—
—
TBD
TBD
Open
0.8
—
—
—
TBD
+85
—
—
V
Input Low Current
Pin 2 to GND
Pin 2 to GND
mA
mA
µF
µF
°C
Standby Input Current
Iin standby
Cin
Cout
(2)
External Input Capacitance
External Output Capacitance
Operating Temperature Range
Over-Temperature Shutdown
560
(3)
330
(4)
T
Over Vin range
Center of case, auto-reset
–40
—
—
a
OTP
Vo≥3.3V
Vo≤2.5V
°C
Storage Temperature
Reliability
T
MTBF
—
-40
—
+125
°C
s
Per Bellcore TR-332
6.3
—
—
106 Hrs
50% stress, Ta =40°C, ground benign
Mechanical Shock
Mil-STD-883D, Method 2002.3
Half Sine, mounted to a fixture
—
TBD
—
G’s
Mechanical Vibration
Mil-STD-883D, Method 2007.2,
20-2000 Hz, PCB mounted
—
Vertical
(5)
Horizontal
—
—
TBD
20
—
—
G’s
grams
Weight
Flammability
—
—
Materials meet UL 94V-0
Notes: (1) The Inhibit control (pin 2) has an internal pull-up to 12V (Vin), and if left open-circuit the module will operate when input power is applied. A small
low-leakage (<100nA) MOSFET is recommended to control this input. See application notes for more information.
(2) A 560µF electrolytic input capacitor is required for proper operation. The capacitor must be rated for a minimumm of 1.3Arms of ripple current. For
further information, consult the related application note on capacitor selection.
(3) An external 330µF output capacitor is required for proper operation. Distributed load capacitance can be included in this value.
(4) See SOA curves or consult factory for the appropriate derating.
(5) The case pins on the through-hole package types (suffixes N & A) must be soldered. For more information see the applicable package outline drawing.
For technical support and more information, see inside back cover or visit www.ti.com
PT5820 Series
16-A 12-V Input Adjustable
Integrated Switching Regulator
Pin Descriptions
+Vin: The positive supply voltage input for the module
Inhibit: This is an active low input, which is referenced
to GND. Driving 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.
with respect to the common GND.
+Vo: This is the regulated output voltage from the mod-
ule with respect to the common GND.
Vo Adjust: This pin is used to trim the output voltage to a
value within a range of up to 10% of the setpoint. The
adjustment requires an external resistor. The resistor is
connected from Vo Adjust, to either the Sense(–) or Sense(+),
in order to adjust the output voltage either up or down,
respectively.
GND: The common GND node to which the input, out-
put, and external control signals are referenced.
Sense(–): Provides the regulator with the ability to sense
the set-point voltage directly across the load. For opti-
mum output voltage accuracy this pin should always be
connected to GND, even for applications that demand a
relatively light load.
Margin Up: When this pin is connected to Sense(–), the
output voltage is increased by 5% of the nominal setpoint.
The Margin Up and Margin Down control inputs provide
a convenient method for testing the operation of the
load circuit over a 5% variation in the supply voltage.
Sense(+): When used with Sense(–), the regulation cir-
cuitry will compensate for voltage drop between the
converter and the load. The pin may be left open circuit,
but connecting it to +Vo will optimize load regulation..
Margin Down: When this pin is connected to Sense(–), the
output voltage is decreased by approximately 5% from
the nominal.
Typical Characteristics
Performance Data; Vin =12.0V (See Note A)
Efficiency vs Output Current
Power Dissipation vs Output Current
100
8
90
6
PT5827
PT5821
80
PT5827
PT5822
PT5821
4
PT5823
PT5824
PT5824
70
PT5826
PT5825
PT5826
2
60
50
0
0
4
8
12
16
0
4
8
12
16
Iout (A)
Iout (A)
Output Ripple vs Output Current
50
40
30
20
10
0
PT5827
PT5821
PT5822
PT5823
PT5824
PT5825
PT5826
0
4
8
12
16
Iout (A)
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
Typical Characteristics
PT5820 Series
16-A 12-V Input Adjustable
Integrated Switching Regulator
Safe Operating Curves, Vin =12V (See Note B)
PT5827, Vout =5V
90
80
Airflow
70
60
50
40
30
20
200LFM
120LFM
60LFM
Nat conv
0
4
8
12
16
16
16
Iout (A)
PT5821, Vout =3.3V
90
80
70
60
50
40
30
20
Airflow
200LFM
120LFM
60LFM
Nat conv
0
4
8
12
Iout (A)
PT5822 .. PT5826, Vout ≤2.5V
90
80
70
60
50
40
30
20
Airflow
200LFM
120LFM
60LFM
Nat conv
0
4
8
12
Iout (A)
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
PT5820 Series
Operating Features of the PT5820 Series of
Step-Down Integrated Switching Regulators
Over-Current Protection
Under-Voltage Lockout (UVLO)
To protect against load faults, the PT5820 series incor-
porates 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 periodi-
cally 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.
The PT5820 series of non-isolated step-down ISRs
incorporate an under-voltage lockout (UVLO) function.
The UVLO provides a clean transition during power-up
and power-down, allowing the regulator to tolerate a
slowly rising input voltage. The UVLO prevents opera-
tion of the regulator until the input voltage is at or above
above the UVLO threshold. The UVLO threshold is just
below the minimum input voltage. Until the input voltage
is above this threshold, the status of the Inhibit control
(pin 2) is overriden, and the module will not produce an
output. When the minimum input voltage of 10.8V is
applied, the output status is determined by the Inhibit
control. If the Inhibit pin is open-circuit (not grounded),
the module will automatically power up. (Note: Even
though the applied input voltage may be above the UVLO
threshold, operation to the published specifications requires
that the input voltage be at or above the minimum specified.
Operation of the module below the minimum input voltage is
not recommended).
Thermal Shutdown
The PT5820 series ISRs incorporate thermal shutdown,
which protects the module’s internal circuitry against
excessively high temperatures. A rise in the temperature
of the internal components may be the result of a drop
in airflow, or a high ambient temperature. If the module’s
internal temperature exceeds the shutdown threshold
(see data sheet specifications), the regulator output is
disabled and the output voltage is reduced to zero. 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.
Soft-Start Power Up
Following either the application of a valid input source
voltage, or the removal of a ground signal to the Inhibit
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. 10–15ms). Figure 1-1 shows
the power-up characteristic of a PT5821 (3.3V). The
delay time, td, is measured from the point at which the
input voltage rises above the UVLO threshold to when
the output voltage starts to rise. During this period the
output of the regulator will assert a low impedance to
ground. This has the effect of discharging any residual
voltage across the output capacitors, and will crowbar
any voltage supplied from external sources.
Note: The over-temperature protection is a last resort mecha-
nism to prevent thermal stress to the regulator. Operation at
or close to the thermal shutdown temperature is not recom-
mended 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.
Output Voltage Adjustment
The PT5820 series ISRs offer OEMs two alternative
methods of output voltage adjustment. The Margin Up
and Margin Down control inputs provide a convenient
method of adjusting the output voltage by a nominal
5% of the factory setpoint voltage. For a more perma-
nent and precise method of adjustment, the Vo Adjust
control allows the output to be adjusted in any incre-
ment by up to 10%. For more information on this
subject, consult the related application note on output
voltage adjustment.
Figure 1-1; Soft-Start Power Up
Vo (2V/Div)
Vin (5V/Div)
t
d
HORIZ SCALE: 5ms/Div
For technical support and more information, see inside back cover or visit www.ti.com
Application Notes
PT5820 Series
Using the Inhibit Control of the PT5820 Series
of Step-Down Regulators
For applications requiring output voltage On/Off control,
the PT5820 series of ISRs incorporate an inhibit function.
This function can be used wherever there is a requirement
for the output voltage from the ISR to be turned off. The
On/Off function is provided by the Inhibit control (pin 2).
Turn-On Time: In the circuit of Figure 2-1, turning Q1 on
applies a low-voltage to the Inhibit control (pin 2) and
disables the output of the regulator 2. If Q1 is then turned
off, the ISR executes a soft-start power up. Power up
consists of a short delay period, td (approx. 10-15msec) ,
followed by a period in which the output voltage rises
to its full regulation voltage. The module produces a
regulated output voltage within 20msec. Figure 2-2
shows the typical rise in both the output voltage and
input current for a PT5821 (3.3V), following the turn-
off of Q1. The turn off of Q1 corresponds to the rise in the
waveform, Q1 Vds. The waveforms were measured with a
12VDC input voltage, and 10-A load.
3
The ISR functions normally with pin 2 open-circuit,
providing a regulated output whenever a valid source
voltage is applied between Vin (pins 5–7) and GND (pins
11–13). When a low-level ground signal is applied to
pin 2, the regulator output is turned off.
Figure 2-1 shows the typical application of the Inhibit
function. Note the discrete transistor (Q1). The Inhibit
control has its own internal pull-up to +Vin potential. An
open-collector or open-drain device is required to control
1
this input . The voltage thresholds are given in Table 2-1.
Figure 2-2
Table 2-1; Inhibit Control Requirements
Parameter
Min
Typ
Max
Enable (V
)
V
– 0.5V
—
—
Open
+0.8V
—
IH
in
Vo (2V/Div)
Iin (2A/Div)
Disable (V
)
IL
–0.2V
—
I
–0.5 mA
IL
Figure 2-1
Q1 Vds (10V/Div)
t
Output Sense (+)
d
1
4
3
18
HORIZ SCALE: 5ms/Div
VIN
VOUT
5, 6, 7
14–17
PT5820
2
9–13
8
Notes:
+
+
1. Use an open-collector device with a breakdown voltage
of at least 15V (preferably a discrete transistor) for the
Inhibit input. A pull-up resistor is not necessary. To disable
the output voltage the control pin should be pulled low
to less than +0.8VDC.
CIN
560µF
COUT
330µF
Q1
BSS138
1 =Inhibit
GND
Output Sense (–)
GND
2. When a ground signal is applied to the Inhibit control
(pin 2) the module output is turned off. The output
voltage decays to zero as the load impedance discharges
the output capacitors.
3. During the period ‘td’ in Figure 2-2 the module will
assert a low impedance to ground. This will discharge any
residual voltage across the output capacitors, and will
crowbar any voltage supplied from external sources.
For technical support and more information, see inside back cover or visit www.ti.com
Application Notes
PT5820 Series
Adjusting the Output Voltage of the
PT5820 Series of Step-Down ISRs
Vo Adjust Resistor Calculations
Using Margin Up/ Margin Down
The values of R1 [adjust up] and (R2) [adjust down] can
also be calculated using the following formulas. Again, use
Figure 3-1for the placement of the required resistor;
either R1 or (R2) as appropriate.
The Margin Up (pin 4) and Margin Down (pin 3) control
inputs allow the output voltage to be easily adjusted by
approximately 5% of the the set-point voltage. These
control inputs provide a convenient method for applying
a momentary adjustment to test a load circuit’s supply
voltage margins. To activate, simply connect the appro-
priate control input to the Sense(–) (pin 8), or the local
starpoint ground. Either a logic level MOSFET or a
p-channel JFET is recommended for this application.
Vr · Ro
R1
=
=
– 24.9
– 24.9
kΩ
kΩ
Va – Vo
Ro (Va – Vr)
Vo – Va
(R2)
Using the ‘Vo Adjust’ Control
For a more permanent and precise adjustment, use the
Vo Adjust control (pin 1). The Vo Adjust control allows
adjustment in any increment by up to 10% of the set-
point. The adjustment method requires the addition of a
single external resistor. Table 3-1 gives the allowable
adjustment range for each model of the series as Va (min)
and Va (max). The value of the external resistor can either
be calculated using the formulas given below, or simply
selected from the range of values provided in Table 3-2.
Refer to Figure 3-1 for the placement of the required
resistor. Use the resistor R1 to adjust up, and the resistor
(R2) to down.
Where: Vo = Original output voltage
Va = Adjusted output voltage
Vr = The reference voltage in Table 3-1
Ro = The resistance constant in Table 3-1
Figure 3-1; Vo Adjust Resistor Placement
Sense (+) [Note 3]
(R2)
18
Sense(+)
Adj Down
Adjust Up: An increase in the output voltage is obtained
by adding a resistor R1, between Vo Adjust (pin 1) and
Sense(–) (pin 8). See Figure 3-1.
VOUT
14–17
VOUT
PT5820
GND
9–13
Sense(–) VO Adj
+
8
COUT
330µF
(Optional)
1
Adjust Down: Add a resistor (R2), between Vo Adjust (pin 1)
and Sense(+) (pin 18). See Figure 3-1.
Notes:
R1
1. Use a 1% (or better) tolerance resistor in either the R1 or
(R2) location. Place the resistor as close to the ISR as
possible.
Adjust Up
Sense (–)
GND
2. Never connect capacitors from Vo Adjust to either GND or
Vout. Any capacitance added to the Vo Adjust pin will affect
the stability of the ISR.
3. If the remote sense feature is not being used, the adjust
resistor (R2) can be connected to Vout, (pins 14-17) instead
of Sense (+).
Table 3-1
ISR OUTPUT VOLTAGE ADJUSTMENT RANGE AND FORMULA PARAMETERS
Series Pt. No.
PT5827
PT5821
PT5822
PT5823
PT5824
PT5825
PT5826
V
V
V
(nom)
(min)
(max)
5.0V
4.0V
5.5V
1.27V
10.0
3.3V
2.6V
3.63V
0.8V
10.2
2.5V
2.0V
2.8V
0.8V
10.7
1.8V
1.52V
2.1V
0.8V
10.2
1.5V
1.31V
1.82V
0.8V
9.76
1.2V
1.1V
1.52V
0.8V
1.0V
0.94V
1.32V
0.8V
o
a
a
V
r
R
(kΩ)
10.0
10.2
o
For technical support and more information, see inside back cover or visit www.ti.com
Application Notes continued
PT5820 Series
Table 3-2
ISR ADJUSTMENT RESISTOR VALUES
Series Pt. No.
Vo (nom)
PT5827
5.0V
PT5821
3.3V
PT5822
2.5V
PT5823
1.8V
PT5824
1.5V
PT5825
1.2V
PT5826
1.0V
Va (req.d)
Va (req.d)
5.50
5.40
5.30
5.20
5.10
5.00
4.90
4.80
4.70
4.60
4.50
4.40
4.30
4.20
4.10
4.00
•
0.5kΩ
6.9kΩ
2.800
2.750
2.700
2.650
2.600
2.550
2.500
2.450
2.400
2.350
2.300
2.250
2.200
2.150
2.100
2.050
2.000
1.950
1.900
1.850
1.800
1.750
1.700
1.650
1.600
1.550
1.500
1.475
1.450
1.425
1.400
1.375
1.350
1.325
1.300
1.275
1.250
1.225
1.200
1.175
1.150
1.125
1.100
1.075
1.050
1.025
1.000
0.975
0.950
3.6KΩ
9.3KΩ
17.4kΩ
38.6kΩ
102.0kΩ
17.9KΩ
32.2KΩ
60.7KΩ
146.0KΩ
(338.0)kΩ
(152.0)kΩ
(89.4)kΩ
(58.3)kΩ
(39.7)kΩ
(27.3)kΩ
(18.4)kΩ
(11.7)kΩ
(6.5)kΩ
(321.0)kΩ
(146.0)kΩ
(85.7)kΩ
(55.3)kΩ
(37.2)kΩ
(25.0)kΩ
(16.4)kΩ
(9.9)kΩ
2.3kΩ
7.7kΩ
(2.4)kΩ
(4.8)kΩ
(0.8)kΩ
15.9kΩ
29.5kΩ
56.7kΩ
138.0kΩ
3.60
3.55
3.50
3.45
3.40
3.35
3.30
3.25
3.20
3.15
3.10
3.05
3.00
2.95
2.90
2.85
2.80
2.75
2.70
2.65
2.60
2.3kΩ
7.7kΩ
15.9kΩ
29.5kΩ
56.7kΩ
138.0kΩ
1.1kΩ
6.3kΩ
(169.0)kΩ
(66.9)kΩ
(32.9)kΩ
(15.9)kΩ
(5.7)kΩ
14.1kΩ
27.2kΩ
53.2kΩ
131.0kΩ
(475.0)kΩ
(220.0)kΩ
(135.0)kΩ
(92.4)kΩ
(66.9)kΩ
(49.9)kΩ
(37.5)kΩ
(28.6)kΩ
(21.6)kΩ
(15.9)kΩ
(11.3)kΩ
(7.4)kΩ
1.8kΩ
4.2kΩ
(239.0)kΩ
(102.0)kΩ
(56.4)kΩ
(33.7)kΩ
(20.0)kΩ
(10.9)kΩ
(4.4)kΩ
7.1kΩ
10.7kΩ
15.1kΩ
20.8kΩ
28.4kΩ
39.1kΩ
55.1kΩ
81.8kΩ
135.0kΩ
295.0kΩ
2.3kΩ
4.8kΩ
(4.1)kΩ
7.7kΩ
(1.3)kΩ
11.4kΩ
15.9kΩ
21.7kΩ
29.5kΩ
40.4kΩ
56.7kΩ
83.9kΩ
138.0kΩ
302.0KΩ
(125.0)kΩ
(45.1)kΩ
(18.4)kΩ
(5.1)kΩ
(46.5)kΩ
(5.7)kΩ
R1 = Black R2 = (Blue)
For technical support and more information, see inside back cover or visit www.ti.com
Application Notes
PT5820 Series
Tantalum Capacitors
Capacitor Recommendations for the
PT5820 Regulator Series
Tantalum type capacitors can be used for the output but
only the AVX TPS, Sprague 593D/594/595 or Kemet
T495/T510 series. These capacitors are recommended
over many other tantalum types due to their higher rated
surge, power dissipation, and ripple current capability.
As a caution the TAJ series by AVX is not recommended.
This series has considerably higher ESR, reduced power
dissipation, and lower ripple current capability. The TAJ
series is less reliable than the AVX TPS series when deter-
mining power dissipation capability. Tantalum or Oscon®
types are recommended for applications where ambient
temperatures fall below 0°C.
Input Capacitor:
The recommended input capacitance is determined by
1.3 ampere minimum ripple current rating and 560µF
minimum capacitance.
Ripple current and <100mΩ equivalent series resistance
(ESR) values are the major considerations, along with
temperature, when designing with different types of
capacitors. Tantalum capacitors have a recommended
minimum voltage rating of twice the maximum DC
voltage + AC ripple. This is necessary to insure reli-
ability for input voltage bus applications.
Capacitor Table
Table 1 identifies the characteristics of capacitors from a
number of vendors with acceptable ESR and ripple cur-
rent (rms) ratings. The number of capacitors required at
both the input and output buses is identified for each
capacitor type.
Output Capacitors:
The maximum allowable ESR of the output capacitor is
150mΩ. Electrolytic capacitors have marginal ripple
performance at frequencies greater than 400kHz but
excellent low frequency transient response. Above the
ripple frequency, ceramic capacitors are necessary to
improve the transient response and reduce any high
frequency noise components apparent during higher
current excursions. Preferred low ESR type capacitor
part numbers are identified in Table 4-1.
This is not an extensive capacitor list. Capacitors from other
vendors are available with comparable specifications. Those listed
are for guidance. The RMS ripple current rating and ESR
(Equivalent Series Resistance at 100kHz) are critical parameters
necessary to insure both optimum regulator performance and
long capacitor life.
Table 4-1: Input/Output Capacitors
Capacitor Vendor/
Series
Capacitor Characteristics
Quantity
Working
Voltage
Value(µF)
(ESR) Equivalent
Series Resistance
105°C Maximum
Ripple
Physical
Size(mm)
Input
Bus
Output
Bus
Vendor Part Number
Current(Irms)
Panasonic
FC (Radial)
35V
25V
25V
680
330
1000
0.043Ω
0.090Ω
0.038Ω
1655mA
755mA
1690mA
12.5×20
10×12.5
16×15
1
N/R (1)
1
1
1
1
EEUFC1V681
EEUFC1E331
EEUFC1E102S
FC/FK (Surface Mtg)
50V
35V
50V
1000
680
1000
0073Ω
0.060Ω
0.073Ω
1610mA
1100mA
1610mA
16×16.5
12.5×13.5
16×16.5
1
1 (2)
1
1
1
1
EEVFK1H102M
EEVFK1V681Q (Vo<2.6V)
EEVFK1H102M
United Chemi-con
LXZ/LXV Series
MVY (Surface Mtg)
35V
35V
25V
680
680
330
0.037Ω
0.068Ω
0.15Ω
1660mA
1050mA
670mA
12.5×20
10×16
10×10.3
1
1
1
1
LXZ35VB681M12X20LL
LXV35VB102M16X20LL(Vo<2.6V)
MVY25VC331M10X10TP
1 (2)
N/R (1)
Nichicon
PL Series
35V
25V
680
1270
0.042Ω
0.055Ω
1540mA
1270mA
18×15
16×15
1
1 (2)
1
1
UPL1V681MHH6
UPL1E122MHH6 (Vo<2.6V)
PM Series
25V
820
0.049Ω
1340mA
16×15
1
1
UPM1E821MHH6
Os-con:
N/R (1)
2
1
1
10SS330M (Vo<5.1V)
16SVP330M
SS
10V
16V
330
330
0.025Ω
0.016Ω
3500mA
4700mA
10×10.5
11×12
SVP (surface Mount)
Old SV Series
AVX Tantalum
TPS (Surface Mtgt)
10V
10V
330
330
0.1Ω
0.06Ω
>2500mA
>3000mA
7.3L
×5.7W
×4.1H
N/R (1)
N/R (1)
1
1
TPSE337M010R0100 (Vo<5.1V)
TPSV337M010R0060 (Vo<5.1V)
Kemet Tantalum
T520/T495 Series
(Surface Mount)
10V
6.3V
330
220
0.040Ω
0.07Ω
1600mA
>2000mA
4.3W
×7.3L
×4.0H
N/R (1)
N/R (1)
1
1
520X337M010AS
T495X227M0100AS
Sprague Tantalum
594D Series
(Surface Mount)
10V
330
0.045Ω
2360mA
7.2L
×6W
×4.1H
N/R (1)
1
594D337X0010R2T
(1) N/R –Not recommended. The voltage rating does not meet the minimum operating limits.
(2) Recommended Input capacitor when Vo<2.6V; lower RMS mA required .
For technical support and more information, see inside back cover or visit www.ti.com
PACKAGE OPTION ADDENDUM
www.ti.com
10-Jan-2013
PACKAGING INFORMATION
Orderable Device
Status Package Type Package Pins Package Qty
Eco Plan Lead/Ball Finish
MSL Peak Temp
Samples
Drawing
(1)
(2)
(3)
(Requires Login)
PT5827C
LIFEBUY SIP MODULE
EPS
18
15
TBD
Call TI
Level-3-215C-168HRS
(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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In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
Addendum-Page 1
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