ETC PT7716

PT7716—3.3V
20-A Low-Voltage Programmable
Integrated Switching Regulator
SLTS162B
(Revised 6/27/2002)
Features
• +3.3V Input Voltage
• 20-A Output Current
• 5-bit Programmable:
1.075V to 1.85V (25mV Steps)
• VRM 9.0 Compatible
• High Efficiency (88%)
•
•
•
•
•
Description
Ordering Information
Pin-Out Information
The PT7716 Excalibur™ power module
is a 20-A integrated switching regulator
(ISR) housed a 27-pin space-saving copper
package. Operating from a 3.3V-input bus,
the PT7716 produces a tightly regulated
supply voltage that is programmable over
the range, 1.075V to 1.85V. The output
voltage is selected via a 5-bit code. The
code adjusts the output voltage in steps
of 25mV and is VRM 9.0 compatible.
This regulator is ideally suited for
applications that employ microprocessor
and DSP products that require core supply
voltages as low as 1.075V.
The PT7716 includes a Shutdown
control, Differential Remote Sense, and
Short-Circuit Protection.
PT7716o = 1.075 to 1.85Volts
PT7744o = 20-A Booster *
Pin Function
Pin Function
1
VID0
2
VID1
15
16
GND
GND
3
VID2
17
GND
4
5
VID3
STBY *
18
GND
6
VID4
19
20
GND
Vout
Package
Code †
7
21
22
Vout
Vout
(ENE)
(ENF)
(ENG)
Vin
Vin
Vin
10
23
24
Vout
Vout
25
Vout
Rem Sense Vout
Sync Out
* Consult the related application note for
information on current booster operation.
PT Series Suffix (PT1234 x )
Case/Pin
Order
Configuration Suffix
Vertical
Horizontal
SMD
N
A
C
Differential Remote Sense
Over-Current Protection
27-Pin Space-Saving Package
Solderable Copper Case
Compatible with PT7744
20A “Current Booster”
8
9
† Previously known as package styles
1420 & 1430
(Reference the applicable package code
drawing for the dimensions and PC
board layout)
11
Vin
Vin
12
13
Rem Sense Gnd
GND
14
GND
26
27
* For STBY pin: open =output enabled
ground =output disabled.
Standard Application
VID0
VID1
VID2
VID3
VID4
PROGRAMMING PINS
REMOTE SENSE(+)
6 4 3 2 1
26
L1
V IN
7-11
1µH
+
C IN
27
5
13-19
V OUT
20-25
PT7716
12
SYNC OUT
GND
GND
STBY*
L
O
A
D
+
C OUT
REMOTE SENSE(–)
Cin = Required 1500µF electrolytic
Cout = Required 330µF electrolytic
Lin = Optional 1µH input choke
For technical support and more information, see inside back cover or visit www.ti.com
PT7716—3.3V
20-A- Low-Voltage Programmable
Integrated Switching Regulator
Programming Information
VID3 VID2 VID1 VID0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
PT7710 Product Family Comparison
VID4=1
Vout
VID4=0
Vout
1.075V
1.100V
1.125V
1.150V
1.175V
1.200V
1.225V
1.250V
1.275V
1.300V
1.325V
1.350V
1.375V
1.400V
1.425V
1.450V
1.475V
1.500V
1.525V
1.550V
1.575V
1.600V
1.625V
1.650V
1.675V
1.700V
1.725V
1.750V
1.775V
1.800V
1.825V
1.850V
Product
Input
Voltage
Adjust
Method
Description
Output
Range
PT7711
5V
VID
5-Bit
1.3V– 3.5V
PT7712
3.3V
VID
4-Bit
1.3V– 2.05V
PT7713
3.3V
VID
4-Bit
1.8V– 2.55V
PT7714
3.3V
VID
5-Bit
0.8V–1.575V
PT7715
5V
VID
5-Bit
1.075V–1.85V
PT7716
3.3V
VID
5-Bit
1.075V–1.85V
PT7744
3.3V
Booster
—
—
PT7745
5V
Booster
—
—
Logic 0 = Pin 12 potential (Rem Sense Gnd)
Logic 1 = Open circuit (no pull-up resistors)
VID4 may not be changed while the unit is operating.
Specifications (Unless otherwise stated, Ta =25°C, Vin =3.3V, Cin =1,500µF, Cout =330µF, Vo =1.8V, and Io =Iomax)
PT7716
Characteristics
Symbols
Conditions
Min
Output Current
Io
T a = +25°C, Natural convection
T a = +60°C, 200 LFM, pkg N
0.1
0.1
Input Voltage Range
Vin
Over I o range
3.1
—
3.6
Set-Point Voltage Tolerance
Vo tol
—
±10
±25
Temperature Variation
∆Reg temp
–40°C ≤Ta ≤+85°C, I o =Iomin
—
±0.75
—
%Vo
Line Regulation
∆Reg line
Over V in range
—
±5
±10
mV
Load Regulation
∆Regload
Over I o range
—
±5
±10
mV
Total Output Voltage Variation
∆Vo tot
Includes set-point, line, load
–40°C ≤T a ≤+85°C
—
±1
±3
%Vo
Efficiency
η
I o =10A
Vo = 1.8V
Vo = 1.5V
Vo = 1.2V
—
—
—
88
85
83
—
—
—
%
I o =20A
Vo = 1.8V
Vo = 1.5V
Vo = 1.2V
—
—
—
84
81
77
—
—
—
%
mVpp
(1)
(1)
Typ
Max
Units
—
—
20
16
A
V
(2)
mV
Vo Ripple (pk-pk)
Vr
20MHz bandwidth
—
35
—
Transient Response
ttr
1A/µs load step, 50% to 100% I omax
—
50
—
µSec
Vos
V o over/undershoot
—
±100
—
mV
Short Circuit Threshold
Isc (pk)
Reset followed by auto-recovery
—
32
—
A
Switching Frequency
ƒo
Over V in range
300
350
400
kHz
STBY* Input Requirements
Input High Voltage
Input Low Voltage
Input Low Current
VIH
VIL
I IL
Referenced to GND
Pin 5 to GND
2.0
–0.2
—
—
—
0.3
Open (3)
0.8
—
Standby Input Current
Iin standby
Pin 5 to GND
—
30
—
—
15,000
µF
Over V in Range
–40
—
+85
°C
—
–40
—
+125
°C
External Capacitance
Cout
Operating Temperature Range
Ta
Storage Temperature
Ts
330
(4)
Mechanical Shock
Per Mil-STD-883D, Method 2002.3
1 msec, Half Sine, mounted to a fixture
—
500
Mechanical Vibration
Mil-STD-883D, 20-2000 Hz
Through-hole
SMT
—
—
20
15
—
36
Weight
—
Vertical/Horizontal
Flammability
—
Materials meet UL 94V-0
Notes: (1)
(2)
(3)
(4)
(5)
(6)
(6)
(6)
V
mA
mA
(5)
—
G’s
—
—
G’s
—
grams
ISR-will operate down to no load with reduced specifications.
If the remote sense ground is not used, pin 12 must be connected to pin 13 for optimum output voltage accuracy.
The STBY* control (pin 5) has an internal pull-up. If it is left open-circuit, the module will operate when input power is applied.
For operation below 0°C, Cin and Cout must have stable characteristics. Use either low ESR tantalum or Oscon® capacitors.
See safe Operating Area curves or consult factory for the appropriate derating.
The case pins on the through-hole package types (suffixes N & A) must be soldered. For more information see the applicable package outline drawing.
External Capacitors: The PT7716 require a minimum output capacitance of 330µF for proper operation. The PT7716 also requires an input capacitance of 1500µF,
which must be rated for a minimum of 1.4Arms of ripple current. For transient or dynamic load applications, additional capacitance may be required. For further
information refer to the application note regarding capacitor selection for this product.
Input Filter: An input filter inductor is optional for most applications. The inductor must be sized to handle 15ADC with a typical value of 1µH.
For technical support and more information, see inside back cover or visit www.ti.com
Typical Characteristics
PT7716—3.3V
20-A Low-Voltage Programmable
Integrated Switching Regulator
Perfrmance Characteristics, Vin =3.3V
Safe Operating Area Curves
(See Note A)
Efficiency vs Output Current
(See Note B)
PT7716; Vin =3.3V
90
90
Efficiency - %
VOUT
1.8V
1.5V
1.2V
70
60
Ambient Temperature (°C)
80
80
70
Airflow
200LFM
120LFM
60LFM
Nat conv
60
50
40
30
50
20
0
4
8
12
16
20
0
Iout (A)
4
8
12
16
20
Iout (A)
Ripple vs Output Current
50
40
Ripple - mV
VOUT
30
1.8V
1.5V
1.2V
20
10
0
0
4
8
12
16
20
Iout (A)
Power Dissipation vs Output Current
10
8
Pd - Watts
VOUT
6
1.2V
1.5V
1.8V
4
2
0
0
4
8
12
16
20
Iout (A)
Note A: All characteristic data in the above graphs has been developed from actual products tested at 25°C. This data is considered typical 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
PT7710 Family, PT7744/PT7745
Capacitor Recommendations for the PT7710
Series of Regulators and Current Boosters
Input Capacitors
The recommended input capacitance is determined by the
1.4 ampere minimum ripple current rating and 1500µF
minimum capacitance. Capacitors listed below must be
rated for a minimum of twice (2×) the input voltage with
+5V operation. Ripple current and ≤100mΩ Equivalent
Series Resistance (ESR) values are the major considerations along with temperature when selecting the proper
capacitor.
Output Capacitors
The minimum required output capacitance is 330µF with
a maximum ESR less than or equal to 100mΩ. Failure to
observe this requirement may lead to regulator instability or
oscillation. Electrolytic capacitors have poor ripple performance at frequencies greater than 400kHz, but excellent low
frequency transient response. Above the ripple frequency
ceramic decoupling capacitors are necessary to improve the
transient response and reduce any microprocessor high
frequency noise components apparent during higher current
excursions. Preferred low ESR type capacitor part numbers
are identified in the Table 1-1 below.
Tantalum Characteristics
Tantalum capacitors with a minimum 10-V rating are
recommended on the output bus, but only the AVX TPS
Series, Sprague 594/595 Series, or Kemet T495/T510
Series. These AVX, Sprague, and Kemet capacitors are
specified over other types due to their higher surge current, excellent power dissipation and ripple current ratings.
As a caution, the TAJ Series by AVX is not recommended.
This series exhibits considerably higher ESR, reduced power
dissipation and lower ripple current capability. The TAJ
series is also less reliable compared to the TPS series when
determining power dissipation capability.
Capacitor Table
Table 1-1 identifies the characteristics of capacitors from a
number of vendors with acceptable ESR and ripple current
(rms) ratings. The suggested minimum quantities per
regulator for both the input and output buses are identified.
This is not an extensive capacitor list. Capacitors from
other vendors are available with comparible specifications.
The RMS ripple current rating and ESR (Equivalent Series
Resistance at 100kHz) are the critical parameters necessary
to insure both optimum regulator performance and long
capacitor life.
Table 1-1 Capacitors Characteristic Data
Capacitor
Vendor/
Series
Capacitor Characteristics
Quantity
Working
Voltage
Value(µF)
(ESR) Equivalent
Series Resistance
105°C Maximum
Ripple
Current(Irms)
Physical
Size(mm)
Input
Bus
Output
Bus
Panasonic
FC (SMT)
16V
35V
2200
330
0.038Ω
0.065Ω
2000mA
1205mA
18x16.5
12.5x16.5
1
1
1
EEVFC1C222N
EEVFC1V331LQ
FC (Radial)
10V
16V
560
1800
0.090Ω
0.032Ω
755mA
2000mA
10x12.5
18x15
1
1
EEUFC1A561
EEUFC1C182S
United
Chemi -Con
LFZ Series
25V
16V
16V
330
1500
470
0.090Ω
0.038Ω
0.090Ω
760mA
1660mA
760mA
10x12.5
12.5x20
10x12.5
1
1
1
1
LXZ25VB331M10X12LL
LXZ16VB222M12X20LL
LXZ16VB471M10X12LL
Nichicon
PL Series
PM Series
10V
10V
25V
680
1800
330
0.090Ω
0.044Ω
0.095Ω
770mA
1420mA
750mA
10x15
16x15
10x15
1
1
1
1
UPL1A681MHH6
UPL1A182MHH6
UPL1E331MPH6
Oscon
SS (Radial)
SVP (SMT)
10V
10V
330
330
0.025Ω÷4 =0.006Ω
0.02Ω÷4 =0.005Ω
>9800mA
>9800mA
10x10.5
9x8.3
4
4
N/R
(Note)
AVX
Tanatalum
TPS- Series
10V
10V
330
330
0.1Ω÷5 =0.02Ω
0.06Ω
3500mA
1826mA
7.3Lx
4.3Wx
4.1H
5
5
1
1
TPSV337M010R0100
TPSV337M010R0060
Sprague
Tantalum
595D/594D
10V
10V
330
680
0.045Ω÷4 =0.011Ω
0.09Ω
>4500mA
>1660mA
7.3L x
5.7W x
4.0H
5
2
1
1
594D337X0010R2T
595D687X0010R2T
(Surface Mount)
Kemet
Tantalum
T510/T495
Series
10V
330
0.035Ω
2000mA
5
1
510X337M010AS
10V
220
0.07Ω÷2 =0.035Ω
4.3Wx7.3L
x4.0H
>2000mA
6
2
T495X227M010AS
(Surface Mount)
Sanyo Poscap
TPB
10V
220
0.04Ω
3000mA
6
2
10TPB220M
(Surface Mount)
7.2L x
4.3W x
3.1H
Note: (N/R) is not recommended for this application, due to extremely low Equivalent Series Resistance (ESR)
For technical support and more information, see inside back cover or visit www.ti.com
1
Vendor Number
10SS330M
10SVP330M
Application Notes
PT7710 Series, PT7744, PT7745
Increasing the Output of the PT7710 Family of
ISRs with a 20-A Compatible Current Booster
Notes:
1. Each booster requires the same amount of input and
output capacitance as recommended for a stand-alone
regulator. Consult the individual data sheet of the
applicable regulator, and the related application note
regarding capacitor selection for this product family.
The output of PT7710 family of regulators (PT7711–
PT7716) can produce an additional 20-A output using a
compatible current booster module. Two booster modules
are available. They are the PT7744 and PT7745, which
are compatible with regulators that operate off 3.3-V
or 5-V input buses respectively. Refer to Table 2-1 for
regulator/booster compatiblity.
2. The 1-µH filter choke located at the input of each
regulator and booster module (Lin) is optional for most
applications. If specified, each inductor must be sized
to handle 20ADC at full output load.
The booster modules are controlled directly by the regulator and effectively add a parallel output stage. They
operate sychronously, to provide a low-noise solution.
Up to two booster modules can be connected to a PT771x
regulator. Each booster added increases the regulator’s
output current by 20A, for up to 60A of output current.
3. The pin-out of the current booster modules include a
number pins identified, “No Connect” (see Table 2-2).
These pins are not connected internally to the module
but must be soldered to a pad to preserve the unit’s
mechanical integrity.
Current boosters are not stand-alone products, and can
only operate with a regulator. They are housed in the same
package as the regulator, and share the same mechanical
outline. Except for an increase in output current, the
overall performance of a regulator/booster combination
is identical to that of a stand-alone regulator. For more
details refer to the applicable regulator specifications.
4. A similar PCB footprint and trace layout between the
regulator and each booster will facilitate current sharing
between all modules.
Table 2-2; Booster Pin-Out Information
Pin Function
Table 2-1; Booster Compatibility
Regulator
P7744 Booster
(3.3V Input Bus)
PT7745 Booster
(5V Input Bus)
•
PT7711
PT7712
PT7713
PT7714
•
•
•
•
PT7715
PT7716
•
Pin Function
Pin Function
1
No Connect
10 Vin
19 GND
2
No Connect
11 Vin
20 Vout
3
No Connect
12 No Connect
21 Vout
4
5
No Connect
No Connect
13 GND
14 GND
22 Vout
23 Vout
6
No Connect
15 GND
24 Vout
7
Vin
16 GND
25 Vout
8
9
Vin
Vin
17 GND
18 GND
26 No Connect
27 Sync In
Figure 1-1; Current Booster Application Schematic
VID0
VID1
VID2
VID3
VID4
PROGRAMMING PINS
REMOTE SENSE (+)
6 4 3 2
VID4 - VID0
L IN
V IN
7-11
1µH
+
26
SNS(+)
PT771x
V IN
STBY
C IN
1
5
Synch
Out
27
GND
13-19
VO
VOUT
20-25
+
SNS(-)
12
C OUT
LOAD
GND
GND
STBY*
REMOTE SENSE (–)
27
Synch In
L IN
7-11
1µH
+
C IN
V IN
PT7744/45
Booster
GND
13-19
VO
20-25
+
C OUT
For technical support and more information, see inside back cover or visit www.ti.com
Application Notes
PT7710 Family
Using the Standby Function on the PT7710
Excalibur™ Series of 20-A ISRs
For applications requiring On/Off control of the output
voltage, the PT7710 family of Excalibur ISRs incorporate a standby function. This feature may be used for
power-up/shutdown sequencing, or to change the output
voltage while input power is applied. See related notes:
“Pin-Coded Output Voltage Adjustment of the PT7710
Excalibur™ Series of 20-A ISRs.”
The standby function is provided by the STBY* control,
pin 5. If pin 5 is left open-circuit the regulator operates
normally, providing a regulated output whenever a valid
supply voltage is applied to Vin (pins 7-11) with respect to
GND (pins 13-19). Connecting pin 5 to ground 1 will set
the regulator output to zero volts 2. This places the regulator in standby mode, and reduces the input current to
typcially 30mA (60mA max). If a ground signal is applied
to pin 5 prior to power-up, the regulator output will be
held at zero volts during the period that input power is
applied.
The standby input must be controlled with an opencollector (or open-drain) discrete transistor (See Figure 1).
Table 3-1 gives the input requirements.
Table 3-1 Standby Control Input Requirements (1, 2)
Parameter
Min
Typ
Max
Enable
Disable
Istby (low)
Vstby (o/c)
2V
–0.2V
Open Cct.
0.8V
0.5mA
1
Figure 3-1
6
4
3
2
1
26
Rem Sns (+)
VID4 - VID0
7-11
5V
20-25
PT7711
Vin
Synch
STBY
Out
5
GND
27
V o =3.3V
Vo
Rem Sns (–)
13-19
12
+
L
O
A
D
+
C in
C out
Q1
BSS138
Inhibit
COM
COM
Turn-On Time: Turning Q1 in Figure 3-1 off, removes the
low-voltage signal at pin 5 and enables the output. After
a delay of approximately 10ms, the output voltage of a
PT771x regulator rises to full regulation within 30ms 3.
Figure 3-2 shows the typical output voltage waveform of
a PT7711 following the turn-off of Q1 at time t =0 secs.
The output voltage in Figure 3-1 is set to 3.3V by connecting
VID0 (pin 1), VID2 (pin 3), and VID3 (pin 4) to the ‘Rem
Sense Gnd’ (pin 12)*. The waveform was measured with a
+5V input source voltage, and 10-A resistive load.
Vin
Notes:
1. The Standby input on the PT7710 regulator family must
be controlled using an open-collector (or open-drain)
discrete transistor. Do Not use a pull-up resistor. The
control input has an open-circuit voltage equal to Vin. To
set the regulator output to zero, the control pin must be
“pulled” to less than 0.8Vdc with a 0.5mA sink to ground.
Figure 3-2
Vo (2V / Div)
2. When placed in the standby mode, the regulator output
discharges the output capacitance with a low impedance to
ground.
3. The turn-off time of Q1, or rise time of the standby input
is not critical with the PT7710 family. Turning Q1 off
slowly, over periods up to 100ms, will not affect regulator
operation. However, a slow turn-off time will increase
both the initial delay and rise-time of the output voltage.
Iin 10A / Div)
0
5
10
15
20
t (milli - secs)
* Consult the data sheet for details on other VID codes.
For technical support and more information, see inside back cover or visit www.ti.com
25
30
Application Notes
PT7710 Family
Pin-Coded Output Voltage Adjustment of the
PT7710 Excalibur™ Series of 20-A ISRs
4. If active devices are used to ground the voltage control
pins, low-level open drain MOSFET devices should be
used over bipolar transistors. The inherent Vce(sat) in
bipolar devices introduces errors in the device’s internal
divider network. Discrete transistors such as the BSS138,
2N7002, or IRLML2402 are examples of appropriate
devices.
The PT7710 Excalibur™ family of converters incorporate
a pin-coded control to adjust the output voltage. This
feature uses the control pins VID0–VID4 (pins 1–6).
When the control pins are left open-circuit, the ISR
output regulates at its default output voltage. Each
control pin is internally connected to a precision resistor,
which when grounded applies a weighted change to the
output voltage. By selectively grounding VID0–VID4,
the output voltage of these ISRs can be programmed in
incremental steps over the specified output voltage range.
The program codes and output voltage range offered by
these ISRs are compatible with the Voltage ID specifications defined by Intel Corporation for VRMs (voltage
regulator modules). The codes are used by both the
Pentium® and Athlon® microprocessors. Refer to
Figure 4-1 for the connection schematic, and the respective
device Data Sheet for the programming code information.
Active Voltage Programming:
Special precautions should be taken when making changes
to the output voltage progam code while the unit is
powered. This activity can induce current transients
through the device as a result of the electrolytic output
capacitors being either charged or discharged to the new
output voltage set-point. The transient current can be
minimized by making only incremental changes to the
binary code, i.e. one LSB at a time. A minimum of 100µs
settling time between each program state is also recommended. Making non-incremental changes to VID3 or
VID4 is discouraged.
When active devices are used to program the output
voltage, their state should be asserted prior to the input
power being applied. An alternative is to pull pin 5 (STBY)
control to GND during the application of input voltage,
then assert the required program code and release pin 5.
The module will then intiate a soft-start power-up to the
desired program voltage. For more information on the
use of the Standby function, consult the related application note, “Using the Standby Function on the PT7710
Excalibur™ Series of 20-A ISRs.”
Notes:
1. The programming convention is as follows:Logic 0:
Logic 1:
Connect to pin 12 (Remote Sense Ground).
Open circuit/open drain (See notes 2, & 4)
2. Do not connect pull-up resistors to the voltage
programming pins.
3. Use pin 12 (Remote Sense Ground) as the logic “0”
reference. While the regular ground (pins 13-19) can also
be used for programming, doing so will degrade the load
reglation of the product. If the remote sense ground is
not used, pin 12 must be connected to pin 13 for
optimum output voltage accuracy.
Figure 4-1
6 4 3 2 1
26
VID4 - VID0
+5V
7-11
1µH
(Optional)
SNS(+)
PT7710
Vin
STBY
5
Synch
Out
27
GND
13-19
20-25
Vo
SNS(-)
12
+
Cin
+
Cout
L
O
A
D
STBY
COM
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