PT8123C [TI]
30-A 12-V Input Programmable Integrated Switching Regulator; 30 -A 12 - V输入可编程集成开关稳压器
| 型号： | PT8123C |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | 30-A 12-V Input Programmable Integrated Switching Regulator |
| 文件： | 总11页 (文件大小：202K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
PT8120 Series
30-A 12-V Input Programmable
Integrated Switching Regulator
SLTS158B
(Revised 6/6/2002)
Features
• Single Device: 30ADC
• +12V-Input
• High Efficiency: 92% @3.3V
• Programmable Output:
(VRM Compatible 5-bit Codes)
• Thermal Shutdown
• Standby On/Off Control
• Space-Saving Package
• Solderable Copper Case
• Multiphase Topology
• Output Remote Sense
• Over-Current Protection
Description
Ordering Information
The PT8120 Excalibur™ power
modules are a family of high-output,
high-efficiency, fully integrated
switching regulators (ISRs), housed
in a solderable 31-pin space-saving
copper package. These modules
operate from a nominal input voltage
of +12V to provide up to 30A of
output current at output voltages as
low as 0.8V. The output voltage is
programmable via a 5-bit input code.
The PT8120 family incorporates
a state-of-the-art, 2-phase, multiple
power path topology. This extends
the output current range while pro-
viding superior transient response
and input current ripple performance.
The PT8120 family is designed
to power high-end computing and
signal processing applications, all of
which demand high output currents
at low supply voltages.
The modules have a number of
features to facilitate system integra-
tion. These include over-current
protection, thermal shutdown, an
on/off standby control, and an output
remote sense to compensate for
voltage drop between the regulator
and the load. In addition, the volt-
age programming codes for the
PT8121, PT8122, & PT8124 are
compatible with Intel’s® VRM
specifications.
PT 8121r = 1.3V
to 3.5V
PT 8122r = 1.075V to 1.85V
PT 8123r = 0.8V
to 1.575V
PT 8124r = 1.05V to 1.825V
PT 8125r = 4.5V to 7.6V
PT Series Suffix
(PT1234x)
Case/Pin
Configuration
O rder
Suffix
Package
Code
Vertical
Horizontal
SMD
N
A
C
(EKH)
(EKF)
(EKG)
(Reference the applicable package code drawing for
the dimensions and PC board layout)
PT812x Standard Application (See page 4 for PT8124 application schematic)
PROGRAMMING PINS
VID0
VID1
VID2
VID3
VID4
REMOTE SENSE
VID
Common
11
5
4
3
2
1
31
Lin
VOUT
PT8120 Series
12–16
+
23–30
VIN
(Except PT8124)
1µH
L
+
O
A
D
6
17–22
CIN
COUT
GND
GND
STBY*
Cin = Required 1500µF electrolytic
Cout = Required 660µF low ESR OS-Con®, or
1,200µF aluminum electrolytic
Lin = Optional 1µH input choke
For technical support and more information, see inside back cover or visit www.ti.com
PT8120 Series
30-A 12-V Input Programmable
Integrated Switching Regulator
†
Pin-Out Information (Except PT8124
)
Pin Function
Pin Function
12 Vin
Pin Function
22 GND
23 Vout
1
2
3
4
5
6
7
8
9
VID 0
VID 1
13 Vin
VID 2
14 Vin
24 Vout
VID 3
15 Vin
25 Vout
VID 4
16 Vin
26 Vout
STBY *
17 GND
18 GND
19 GND
20 GND
21 GND
27 Vout
Do Not Connect
Do Not Connect
Do Not Connect
28 Vout
29 Vout
30 Vout
10 Do Not Connect
11 VID Common
31 Remote Sense
*For STBY pin:
† See page 4 for PT8124 pin-out
Open
=Output Enabled
Ground =Output Disabled
Output Voltage Programming Information (Except PT8124)
PT8122
(VRM 9.0)
PT8123
(Custom Code)
PT8125
(Custom Code)
PT8121
(VRM 8.3/8.4)
VID 4=1
Vout
VID 4=0
Vout
VID 4=1
Vout
VID 4=0
Vout
VID 4=1
Vout
VID 4=0
Vout
VID 4=1
Vout
VID 4=0
VID 3 VID 2 VID 1 VID 0
Vout
6.1V
6.2V
6.3V
6.4V
6.5V
6.6V
6.7V
6.8V
6.9V
7.0V
7.1V
7.2V
7.3V
7.4V
7.5V
7.6V
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
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
0.800V
0.825V
0.850V
0.875V
0.900V
0.925V
0.950V
0.975V
1.000V
1.025V
1.050V
1.075V
1.100V
1.125V
1.150V
1.175V
1.200V
4.5V
2.00V
2.10V
2.20V
2.30V
2.40V
2.50V
2.60V
2.70V
2.80V
2.90V
3.00V
3.10V
3.20V
3.30V
3.40V
3.50V
1.30V
1.35V
1.40V
1.45V
1.50V
1.55V
1.60V
1.65V
1.70V
1.75V
1.80V
1.85V
1.90V
1.95V
2.00V
2.05V
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
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
4.6V
4.7V
4.8V
4.9V
5.0V
5.1V
5.2V
5.3V
5.4V
5.5V
5.6V
5.7V
5.8V
5.9V
6.0V
Notes:
i) Logic 0 = Connect to VID Common
ii) Logic 1 = Open circuit (no pull-up resistors)
iii) VID3 and VID4 may not be changed while the unit is operating.
iv) See page 4 for PT8124 (VRM 8.5) programming information.
For technical support and more information, see inside back cover or visit www.ti.com
PT8120 Series
30-A 12-V Input Programmable
Integrated Switching Regulator
PT8121 /2 /3 /5 Specifications (Unless otherwise stated Ta =25°C, Cin =1,500µF, Cout =660µF, Vin =12V, & Io = Iomax )
PT8121 /2 /3 /5 Only
Characteristics
Symbols
Conditions
Min
Typ
Max
Units
(1)
(1)
Output Current
Io
Natural convection or
V
V
o ≤3.5V 0.1
o ≥4.5V 0.1
—
—
30
28
A
60°C with 200LFM airflow
Input Voltage Range
Set-Point Voltage Tolerance
Line Regulation
Vin
Over Io Range
Over Vo range
Over Vin range
Over Io range
10.8
—
—
1
13.2
2
V
Vo tol
%V
mV
mV
%Vo
∆Regline
∆Regload
∆Regtemp
∆Votot
—
10
10
0.5
—
—
—
Load Regulation
—
Temperature Variation
Total Output Voltage Variation
–40°C ≤Ta ≤85°C
—
Includes set-point, line load,
–40°C ≤Ta ≤ 85°C
—
—
3
%V
Efficiency
η
Io =15A
Vo =5.0V
Vo =3.3V
Vo =2.5V
Vo =1.8V
Vo =1.5V
Vo =1.2V
—
—
—
—
—
—
94
92
90
86
84
81
—
—
—
—
—
—
%
I
o =Iomax
Vo =5.0V
Vo =3.3V
Vo =2.5V
Vo =1.8V
Vo =1.5V
Vo =1.2V
—
—
—
—
—
—
93
91
88
84
82
78
—
—
—
—
—
—
%
Vo Ripple (pk-pk)
Vr
20MHz bandwidth
—
—
—
20
—
—
—
mV
µSec
mV
Transient Response
ttr
1A/µs load step, 50% to 100% Iomax
Vo over/undershoot
50
∆Vtr
ITRIP
100
Over-Current Threshold
Switching Frequency
Reset followed by auto-recovery
V
V
o ≥4.5V
o ≤3.5V
—
—
40
45
—
—
A
ƒs
Over load range
300
350
400
kHz
Standby Control (pin 6)
Input High Voltage
Input Low Voltage
Referenced to GND (pins 17–22)
(2)
—
-0.2
—
—
Open
0.8
VIH
VIL
V
Input Low Current
IIL
Pin 6 to GND
—
0.5
35
—
—
—
—
—
mA
mA
µF
Standby Input Current
External Output Capacitance
External Input Capacitance
Operating Temperature Range
Storage Temperature
Iin standby
Pin 6 to GND
—
—
(3)
(4)
Cout
Cin
Ta
See PT812x application schematic
See PT812x application schematic
Over Vin Range
660
1,500
–40
-40
30,000
—
µF
(5)
+85
°C
°C
Ts
—
+125
Mechanical Shock
Per Mil-STD-883D, Method 2002.3
1 msec, Half Sine, mounted to a fixture
—
500
—
G’s
Mechanical Vibration
Mil-STD-883D, Method 2007.2
20-2000 Hz, soldered in PCB
(6)
—
—
20
55
—
—
G’s
Weight
—
—
Vertical/Horizontal
grams
Flammability
Materials meet UL 94V-0
Notes: (1) ISR-will operate down to no load with reduced specifications.
(2) The Standby input (pin 6) has an internal pull-up. If it is left open-circuit the PT812x will operate when input power is applied. A low-leakage
MOSFET is recommended to control this input. The open-circuit voltage is nominally 5V. See application notes for interface considerations.
(3) The PT8120 regulators require a minimum of 660µF, low ESR ouput capacitance (1,200µF for standard aluminum electrolytic) for proper operation.
(4) For operation below 0°C, Cout must have stable characteristics. Use either low ESR tantalum or Oscon® capacitors.
(5) See safe Operating Area curves or consult factory for the appropriate derating.
(6) The case pins on the through-hole package types (suffixes N & A) must be soldered. For more information see the applicable package outline drawing.
Input Filter: An input filter inductor is optional for most applications. The inductor must be rated to handle the projected input current. A rating of 10ADC for
Vout ≤3.3V, and 15ADC for Vout ≥4.5V is recommended. The input capacitance must be rated for a minimum of 1.6Arms of ripple current. For transient or dynamic
load applications, additional capacitance may be required. For more information consult the application note on capacitor selection.
For technical support and more information, see inside back cover or visit www.ti.com
PT8120 Series
30-A 12-V Input Programmable
Integrated Switching Regulator
PT8124 Voltage Programming Information
PT8124 Pin-Out Information
(VRM 8.5)
Pin Function
Pin Function
VID 25mV=0
Vout
VID 25mV=1
1
2
3
4
5
6
7
8
9
VID 25mV
VID 0
17 GND
18 GND
19 GND
20 GND
21 GND
22 GND
23 Vout
VID 3 VID 2 VID 1 VID 0
Vout
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
1.300V
1.325V
1.375V
1.425V
1.475V
1.525V
1.575V
1.625V
1.675V
1.725V
1.775V
1.825V
1.075V
1.125V
1.175V
1.225V
1.275V
VID 1
1.350V
1.400V
1.450V
1.500V
1.550V
1.600V
1.650V
1.700V
1.750V
1.800V
1.050V
1.100V
1.150V
1.200V
1.250V
VID 2
VID 3
STBY
Do Not Connect
Do Not Connect
Do Not Connect
24 Vout
25 Vout
10 Do Not Connect
11 VID Common
12 Vin
26 Vout
27 Vout
28 Vout
13 Vin
29 Vout
14 Vin
30 Vout
15 Vin
31 Remote Sense
16 Vin
*For STBY pin:
Notes:
Open
=Output Enabled
i) Logic 0 = Connect to VID Common
ii) Logic 1 = Open circuit (no pull-up resistors)
Ground =Output Disabled
iii) VID2 and VID3 may not be changed while the unit is operating.
PT8124 Standard Application
PROGRAMMING PINS
VID 25mV
VID 0
VID 1
VID 2
VID 3
REMOTE SENSE
VID
Common
11
5
4
3
2
1
31
Lin
VOUT
PT8124
(Only)
12–16
23–30
VIN
1µH
L
O
A
D
+
+
6
17–22
CIN
COUT
GND
GND
STBY*
Cin = Required 1500µF electrolytic
Cout = Required 660µF low ESR OS-Con®, or
1,200µF aluminum electrolytic
Lin = Optional 1µH input choke
For technical support and more information, see inside back cover or visit www.ti.com
PT8120 Series
30-A 12-V Input Programmable
Integrated Switching Regulator
PT8124 Specifications (Unless otherwise stated Ta =25°C, Cin =1,500µF, Cout =660µF, Vin =12V, & Io = Iomax )
PT8124 Only
Characteristics
Symbols
Conditions
Min
Typ
Max
Units
Output Current
Io
Natural convection or
(1)
0.1
—
30
A
60°C with 200LFM airflow
Input Voltage Range
Vin
Over Io Range
10.8
—
—
1
13.2
2
V
Set-Point Voltage Tolerance
Line Regulation
Vo tol
Over Vo range, Io =0.5A
Over Vin range
%V
mV
∆Regline
∆Regload
∆Regtemp
∆Votot
—
10
2
—
—
—
Load Regulation (Droop)
Temperature Variation
Total Output Voltage Variation
Over Io range
—
mV/A
%Vo
–40°C ≤Ta ≤85°C, , Io =0.5A
—
0.5
Includes set-point, line, load
(2)
—
—
85
mV
–40°C ≤Ta ≤ 85°C
Efficiency
η
Io =15A
Vo =1.8V
Vo =1.5V
Vo =1.2V
—
—
—
86
84
81
—
—
—
%
I
o =Iomax
Vo =1.8V
Vo =1.5V
Vo =1.2V
—
—
—
84
82
78
—
—
—
%
Vo Ripple (pk-pk)
Vr
20MHz bandwidth
—
20
50
—
mV
µSec
mV
A
Transient Response
ttr
1A/µs load step, 50% to 100% Iomax
Vo over/undershoot
—
—
∆Vtr
ITRIP
ƒs
—
50
—
Over-Current Threshold
Switching Frequency
Reset followed by auto-recovery
Over load range
—
47
—
300
350
400
kHz
Standby Control (pin 6)
Input High Voltage
Input Low Voltage
Referenced to GND (pins 17–22)
(3)
—
-0.2
—
—
Open
0.8
—
VIH
VIL
IIL
V
—
Input Low Current
Pin 6 to GND
0.5
mA
mA
µF
Standby Input Current
External Output Capacitance
External Input Capacitance
Operating Temperature Range
Storage Temperature
Iin standby
Pin 6 to GND
—
35
—
—
—
—
—
(4)
(5)
Cout
Cin
Ta
See PT8124 application schematic
See PT8124 application schematic
Over Vin Range
660
1,500
–40
-40
30,000
—
µF
+85 (6)
+125
°C
°C
Ts
—
Mechanical Shock
Per Mil-STD-883D, Method 2002.3
1 msec, Half Sine, mounted to a fixture
—
500
—
G’s
Mechanical Vibration
Mil-STD-883D, Method 2007.2
20-2000 Hz, soldered in PCB
(7)
—
—
20
55
—
—
G’s
Weight
—
—
Vertical/Horizontal
grams
Flammability
Materials meet UL 94V-0
Notes: (1) ISR-will operate down to no load with reduced specifications.
(2) Total output voltage variation includes load regulation droop, which is required for compliance with specification VRM 8.5-4
(3) The Standby input (pin 6) has an internal pull-up. If it is left open-circuit the PT812x will operate when input power is applied. A low-leakage
MOSFET is recommended to control this input. The open-circuit voltage is nominally 5V. See application notes for interface considerations.
(4) The PT8120 regulators require a minimum of 660µF, low ESR ouput capacitance (1,200µF for standard aluminum electrolytic) for proper operation.
(5) For operation below 0°C, Cout must have stable characteristics. Use either low ESR tantalum or Oscon® capacitors.
(6) See safe Operating Area curves or consult factory for the appropriate derating.
(7) The case pins on the through-hole package types (suffixes N & A) must be soldered. For more information see the applicable package outline drawing.
Input Filter: An input filter inductor is optional for most applications. The inductor must be rated to handle the projected input current. A rating of 10ADC for
Vout ≤3.3V, and 15ADC for Vout ≥4.5V is recommended. The input capacitance must be rated for a minimum of 1.6Arms of ripple current. For transient or dynamic
load applications, additional capacitance may be required. For more information consult the application note on capacitor selection.
For technical support and more information, see inside back cover or visit www.ti.com
PT8120 Series
30-A 12-V Input Programmable
Integrated Switching Regulator
Characteristic Data; Vin =12V (See Note A)
Safe Operating Area; Vin =12V (See Note B)
Efficiency vs Output Current
PT8120 Series, Vout =5V
90
100
VOUT
80
70
60
50
40
30
20
Airflow
90
5V
3.3V
2.5V
400LFM
200LFM
120LFM
60LFM
1.8V
80
1.5V
1.2V
1.0V
Nat conv
0.8V
70
60
0
6
12
18
24
30
0
6
12
18
24
30
Iout (A)
Iout (A)
Output Ripple vs Output Current
PT8120 Series, Vout =3.3V
30
25
20
15
10
5
90
80
70
60
50
40
30
20
Airflow
VOUT
5V
Nat conv
60LFM
0.8V
120LFM
200LFM
400LFM
3.3V
1.5V
0
0
6
12
18
24
30
0
6
12
18
24
30
Iout (A)
Iout (A)
Power Dissipation vs Output Current
PT8120 Series, Vout =1.5V
15
12
9
90
80
70
60
50
40
30
20
Airflow
VOUT
400LFM
200LFM
120LFM
60LFM
5V
3.3V
1.5V
0.8V
6
Nat conv
3
0
0
6
12
18
24
30
0
6
12
18
24
30
Iout (A)
Iout (A)
Note A: Characteristic data has been developed from actual products tested at 25°C. This data is considered typical data for the Converter.
Note B: SOA curves represent the conditions at which internal components are at or below the manufacturer’s maximum operating temperatures
For technical support and more information, see inside back cover or visit www.ti.com
Application Notes
PT8120 Series & PT8139
Capacitor Recommendations for the
PT8120 Series of Programmable ISRs
Tantalum Characteristics
Tantalum capacitors are recommended on the output bus
but only AVX TPS Series, Sprague 593D/594/595 Series,
or Kemet T495/T510,520 Series. These capacitors are
recommended 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 rec-
ommended. This series exhibits considerably higher ESR,
reduced power dissipation and lower ripple current capa-
bility. The TAJ Series is also less reliable compared to the
TPS series when determining power dissipation capability.
Input Capacitors
The recommended input capacitor(s) is determined by
1.6 Arms minimum ripple current rating and 1,500µF
minimum capacitance. Ripple current and Equivalent
Series Resistance (ESR) values are the major considerations
along with temperature when selecting the proper capaci-
tor. The tantalum capacitors listed below cannot be used
on the input bus since they are not rated for 12V operation.
Capacitor Table
Output Capacitors
Table 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.
The minimum required output capacitance is 660µF
(organic/polymer), or 1,200 (aluminum electrolytic) with
a maximum ESR less than or equal to 50mΩ. Failure to
observe this requirement may lead to regulator instabil-
ity 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 nec-
essary 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 below.
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 the
critical parameters are necessary to insure both optimum
regulator performance and long capacitor life.
Table 1 Capacitors Characteristic Data
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
1500
1500
0.028Ω
0.029Ω
2490mA
2205mA
18× 20
16× 20
1
1
1
1
EEUFC1V152S
EEUFC1E152S
16V
25V
16V
4700
2200
2200
0.033Ω
0.028Ω
0.038Ω
2060mA
2490mA
2000mA
18×16.5
18×21.5
18×16.5
1
1
2
1
1
1
EEVFK1C472M
EEVFC1E222N
EEVFC1C222N
FC/FK (Surface Mount)
United Chemi-con
LXZ Series
35V
25V
16V
1800
1800
2700
0.028Ω
0.029Ω
0.029Ω
2490mA
2210mA
2210mA
18× 20
16×20
16× 20
1
1
1
1
1
1
LXZ35VB182M18X20LL
LXZ25VB182M16X20LL
LXZ16VB272M16X20LL
Nichicon
PW Series
25V
25V
1000
1800
0.038÷2Ω
0.029Ω
3200mA
2205mA
12.5x20
16x20
2
1
1
1
UPW1E102MHH
UPW1E182MHH6
PM Series
25V
1500
0.034Ω
1770mA
16×20
1
1
UPM1E152MHH6
Os-con:( Organic)
SS
SV (Surface Mount)
10V
10V
330
330
0.025Ω
0.020Ω
3500mA
3800mA
10×10.5
10.3×10.3
N/R(1)
N/R(1)
2
2
10SS330M (Vo<6V)
10SV330 (Vo<6V)
AVX Tantalum
TPS (Surface Mount)
10V
10V
330
330
0.1Ω÷2 =0.05Ω
0.06Ω÷2 =0.03Ω
>2500mA
>3000mA
7.3L
×5.7W
×4.1H
N/R(1)
N/R(1)
2
2
TPSE337M010R0100 (Vo<5V)
TPSV337M010R0060( Vo<5V)
Kemet
10V
10V
330
330
0.040÷2Ω
0.040÷2Ω
1800mA
>1800mA
4.3W
×7.3L
×4.0H
N/R(1)
N/R(1)
2
2
T520X337M010AS (Vo<6V)
T520D330M006AS (Vo<4V)
Polymer/Tantalum
T520Series
(Surface Mount)
Sprague Tantalum
594D Series
(Surface Mount)
10V
330
0.045÷2Ω
2360mA
7.2L
×6W
×4.1H
N/R(1)
2
594D337X0010R2T(Vo<5V)
Note: (N/R -Not recommended) The 10V-rated tantalum capacitors cannot be used on the input bus.
For technical support and more information, see inside back cover or visit www.ti.com
Application Notes
PT8120 Series & PT8139
Using the On/Off Standby Function of the
PT8120 Series of Programmable ISRs
The PT8120 series of programmable ISRs incorporates
an On/Off Standby function. This feature may be used
to turn the regulated output of the module off while input
voltage is applied. This places the module in “standby”
mode. The standby control may be used for power-up
sequencing, or wherever there is a requirement to control
the module’s output status from another circuit.
2. In the standby mode the output of the regulator is tri-
state, and the output voltage falls at the rate that the
load circuit discharges the output filter capacitors.
3. When the ground signal to the Standby pin is
removed, the regulator output initiates a soft-start
cycle by first asserting a low impedance to ground. If
an external voltage is applied to the output bus, it will
sink current and possibly over-stress the part.
The Standby function is provided by the STBY* control,
pin 6. If pin 6 is left open-circuit the regulator operates
normally, providing a regulated output when a valid sup-
ply voltage is applied to Vin (pins 10-16) with respect to
Turn-On Time
Turning Q1 in Figure 1 off, removes the low-voltage
signal at pin 6. After approximately 5-ms the regulator
output rises and reaches full regulation within 40ms.
Fig. 2 shows the typical waveforms of a PT8121 following
the prompt turn-off of Q1. The turn-off of Q1 corresponds
to the rise in Vstby. The output voltage was set to 3.3V,
and the waveforms were measured with a 12V input source,
and 18A resistive load.
1
GND (pins 17-22). Connecting pin 6 to ground places
2
the regulator in standby mode , and reduces the input
current to typically 35mA. Applying a ground signal to
pin 6 prior to power-up, will inhibit the output during
the period that input power is applied. When the ground
signal to pin 6 is removed, the regulator initiates a soft-
3
start to re-establish the set output voltage. To ensure
that the regulator output is properly enabled, the STBY*
control pin must be open circuit.
Table 1 Standby Control Requirements 2
Figure 2
Parameter
VIH
Min
—
Typ
Max
Open Cct.
0.8V
1
VIL
–0.2V
—
Vo (1V/Div)
ISTBY
–0.5mA
Notes:
1. The standby on a PT8120 series regulators must be
controlled with an open-collector (or open-drain)
transistor (See fig. 1). Do Not use a pull-up resistor.
Table 1 gives the STBY* pin parameters. The control
pin has an open-circuit voltage of 5Vdc. To shut the
regulator output off, the control pin must be “pulled” to
less than 0.8Vdc with a low-impedance sink to ground.
Iin (5A/Div)
Vstby (5V/Div)
HORIZ SCALE: 5ms/Div
Figure 1
VO SENSE
11
5
4
3
2
1
31
VID
Common
VID4 – VID0
Sense
Lin
VIN
VO =3.3V
12–16
23–30
VIN
VOUT
PT8121
1µH
STBY
6
GND
17–22
L
O
A
D
+
+
CIN
COUT
Q1
BSS138
1 =Off
GND
GND
For technical support and more information, see inside back cover or visit www.ti.com
Application Notes
PT8120 Series & PT8139
Pin-Coded Output Voltage Programming of the
30-A Rated PT8120 Series Regulators
4. If active devices are used to ground the voltage control
pins, low-level open drain MOSFETs should be used over
bipolar transistors. The inherent Vce(sat) in bipolar devices
introduces errors in the device’s internal voltage control
circuit. Discrete transistors such as the BSS138, 2N7002,
IRLML2402, are examples of appropriate devices.
The PT8120 series of Excalibur® ISRs incorporate a
pin-coded output voltage control. These regulators must
be programmed to a specific output voltage from a pre-
set range defined by the regulator model. Programming
is achieved by selectively connecting the control inputs,
1
“VID0–VID4” (pins 1–5), to the “VID Common” (pin 11).
The programming code and voltage range for each model
is defined in the data sheet. Refer to the PT8120 Series
data sheet for more information. The program codes for
the PT8121, PT8122, and PT8124 models are also com-
patible with some of the “Voltage ID” codes defined by
Intel’s® VRM specifications. Figure 1 shows the pin-strap
connections for selecting the desired output voltage from
the program code range.
Active Voltage Programming:
Special precautions should be taken when making changes
to the voltage control progam code while the output is
active. It is recommended that the ISR be powered down
or held placed in standby. Changes made to the program
code while Vout is active induces high current transients
through the device. This is the 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 recom-
mended. Making non-incremental changes to VID3 and
VID4 with the output enabled is discouraged. The tran-
sients induced may activate the module’s over-current
protection. If the program code cannot be asserted prior
to power-up, pull pin 6, STBY*, to GND during the
period that the input voltage is applied. The release of
pin 6 will then to allow the device to initiate a soft-start
power-up to the program voltage.
Notes:
1. The programming convention is as follows:-
Logic 0:
Logic 1:
Connect to pin 11 (VID Common).
Open circuit/open drain (See notes 2, & 4)
2. Do not connect pull-up resistors to the voltage
programming pins.
3. To minimize output voltage error, use pin 11 (VID
Common) as the logic “0” reference. If the regulator is
used to power a VRM compatible microprocessor this
may not be practical. In this case connect pin 11 to pins
17–22, or the ground plane close to the regulator.
Figure 1
VID0
VID1
VID2
VID3
VID4
VO SENSE
11
5
4
3
2
1
31
VID4 – VID0 Sense
VID
Common
Lin
VIN
VO =2.5V
12–16
23–30
VIN
VOUT
PT8121
1µH
STBY
6
GND
L
O
A
D
17–22
+
+
CIN
COUT
GND
GND
For technical support and more information, see inside back cover or visit www.ti.com
PACKAGE OPTION ADDENDUM
www.ti.com
1-Sep-2012
PACKAGING INFORMATION
Status (1)
Eco Plan (2)
MSL Peak Temp (3)
Samples
Orderable Device
Package Type Package
Drawing
Pins
Package Qty
Lead/
Ball Finish
(Requires Login)
PT8121A
PT8122A
PT8125C
OBSOLETE SIP MODULE
EKF
31
31
31
TBD
TBD
TBD
Call TI
Call TI
Call TI
Call TI
NRND
NRND
SIP MODULE
SIP MODULE
EKF
EKG
6
6
Level-1-215C-UNLIM
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.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information
provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and
continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.
TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
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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