PT7745N [TI]

20-A Programmable Integrated Switching Regulator; 20 -A可编程集成开关稳压器
PT7745N
型号: PT7745N
厂家: TEXAS INSTRUMENTS    TEXAS INSTRUMENTS
描述:

20-A Programmable Integrated Switching Regulator
20 -A可编程集成开关稳压器

稳压器 开关
文件: 总9页 (文件大小:183K)
中文:  中文翻译
下载:  下载PDF数据表文档文件
PT7711—5V  
20-A Programmable  
Integrated Switching Regulator  
SLTS087A  
(Revised 6/27/2002)  
Features  
5V Input Voltage  
27-Pin Space-Saving Package  
20-A Output Current  
5-bit Programmable Output:  
1.3V to 3.5V  
Solderable Copper Case  
Compatible with PT7745  
20A “Current Booster”  
High Efficiency (93%)  
Differential Remote Sense  
Over-Current Protection  
Ordering Information  
Description  
Pin-Out Information  
Pin Function  
PT 7711o = 1.3 to 3.5 Volts  
PT 7745o = 20-A Booster *  
Pin Function  
The PT7711 Excalibur™ power module  
is a 20-A integrated switching regula-  
tor (ISR) housed a 27-pin space-saving  
copper package. Operating from a +5V  
input bus, the PT7711 produces a tightly  
regulated output voltage that is program-  
mable over the range, 1.3V to 3.5V. The  
output voltage is selected via 5-bit input  
code, which is compatible with the VRM  
specifications defined by Intel®.  
This regulator is most suitable for  
microprocessor and DSP applications  
requiring core or I/O logic supply volt-  
ages as low as 1.3V.  
15 GND  
16 GND  
17 GND  
18 GND  
19 GND  
1
VID0  
VID1  
VID2  
VID3  
STBY *  
VID4  
2
* Consult the related application note for  
information on current booster operation.  
3
4
5
PT Series Suffix  
(PT1234x)  
20  
21  
22  
23  
24  
25  
V
out  
V
out  
V
out  
V
out  
V
out  
V
out  
6
Case/Pin  
O rder  
Package  
7
V
in  
V
in  
V
in  
V
in  
V
in  
Configuration Suffix  
Code  
8
9
Vertical  
Horizontal  
SMD  
N
A
C
(ENE)  
(ENF)  
(ENG)  
10  
11  
Previously known as package styles  
1420 & 1430  
26 Rem Sense Vout  
12 Rem Sense Gnd  
13 GND  
27 Sync Out  
(Reference the applicable package code  
drawing for the dimensions and PC  
board layout)  
The PT7711 regulator incorporates  
output short-circuit protection, and a  
differential remote sense to compensate  
for voltage drop between the regulator  
and load.  
14 GND  
For STBY* pin: open =output enabled  
ground =output disabled.  
Standard Application  
PROGRAMMING PINS  
VID0  
VID1  
VID2  
VID3  
REMOTE SENSE(+)  
VID4  
6
4
3
2
1
26  
12  
L1  
1µH  
VOUT  
7-11  
20-25  
VIN  
PT7711  
L
O
A
D
+
27  
5
13-19  
+
CIN  
COUT  
SYNC OUT  
GND  
GND  
REMOTE SENSE(–)  
STBY*  
Cin = Required 1500µF electrolytic  
Cout = Required 330µF electrolytic  
L1 = Optional 1µH input choke  
For technical support and more information, see inside back cover or visit www.ti.com  
PT77115V  
20-A Programmable  
Integrated Switching Regulator  
PT7710 Product Family Comparison  
Programming Information  
VID4=1  
Vout  
VID4=0  
Vout  
Input  
Adjust  
Description Method  
Output  
Range  
VID3 VID2 VID1 VID0  
Product  
Voltage  
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
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  
PT 7711  
5V  
3.3V  
3.3V  
3.3V  
5V  
VID  
VID  
5-Bit  
4-Bit  
4-Bit  
5-Bit  
5-Bit  
5-Bit  
1.3V– 3.5V  
1.3V– 2.05V  
1.8V– 2.55V  
0.8V–1.575V  
1.075V–1.85V  
1.075V–1.85V  
PT 7712  
PT 7713  
PT 7714  
PT 7715  
PT 7716  
PT 7744  
PT 7745  
VID  
VID  
VID  
3.3V  
3.3V  
5V  
VID  
Booster  
Booster  
Logic 0 = Pin 12 potential (Rem Sense Gnd)  
Logic 1 = Open circuit (no pull-up resistors)  
VID 3 & VID4 must not be changed while the unit is operating.  
Specifications (Unless otherwise stated, Ta =25°C, Vin =5V, Cin =1,500µF, Cout =330µF, Vo =3.3V, and Io =Iomax)  
PT7711  
Characteristics  
Symbols  
Conditions  
Min  
Typ  
Max  
Units  
(1)  
(1)  
Output Current  
Io  
Ta = +25°C, Natural convection  
Ta = +60°C, 200 LFM, pkg N  
0.1  
0.1  
20  
20  
A
Input Voltage Range  
Set-Point Voltage Tolerance  
Temperature Variation  
Line Regulation  
Vin  
Over Io range  
4.5  
10  
5.5  
V
(2)  
Vo tol  
Regtemp  
Regline  
Regload  
Vo tol  
All output voltages  
–40°C Ta +85°C, Io =Iomin  
Over Vin range  
25  
mV  
%Vo  
mV  
mV  
0.75  
5
5
Load Regulation  
Over Io range  
Total Output Voltage Variation  
Includes set-point, line, load,  
1
3
%Vo  
%
–40°C Ta +85°C  
Efficiency  
η
Io =10A  
Vo =3.3V  
Vo =2.5V  
Vo =1.8V  
93  
90  
87  
Io =20A  
Vo =3.3V  
Vo =2.5V  
Vo =1.8V  
90  
85  
80  
%
Vo Ripple (pk-pk)  
Vr  
20MHz bandwidth  
35  
50  
mVpp  
µSec  
mV  
A
Transient Response  
ttr  
1A/µs load step, 50% and 100% Iomax  
Vo over/undershoot  
Vos  
ITRIP  
ƒs  
100  
Over-Current Threshold  
Switching Frequency  
Reset followed by auto-recovery  
Over Vin range  
32  
300  
350  
400  
kHz  
STBY* Input Requirements  
Input High Voltage  
(3)  
Open  
0.8  
VIH  
VIL  
IIL  
Referenced to GND  
2.0  
V
Input Low Voltage  
-0.2  
Input Low Current  
Standby Input Current  
External Capacitance  
Operating Temperature Range  
Storage Temperature  
Mechanical Shock  
Pin 5 to GND  
Pin 5 to GND  
0.3  
30  
mA  
mA  
µF  
°C  
°C  
Iin standby  
(4)  
Cout  
Ta  
330  
–40  
-40  
15,000  
(5)  
Over Vin Range  
+85  
Ts  
+125  
Per Mil-STD-883D, Method 2002.3  
1 msec, Half Sine, mounted to a fixture  
500  
G’s  
(6)  
15 (6)  
Mechanical Vibration  
Mil-STD-883D, Method 2007.2 Suffixes A, N  
20  
G’s  
20-2000 Hz  
Suffix C  
Weight  
Vertical/Horizontal  
Materials meet UL 94V-0  
36  
grams  
Flammability  
Notes: (1) ISR-will operate down to no load with reduced specifications.  
(2) If the remote sense ground is not used, pin 12 must be connected to pin 13 for optimum output voltage accuracy.  
(3) 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. A low-leakage (<1µA)  
MOSFET must be used to control this pin. The open-circuit voltage may be as high as Vin.  
(4) For operation below 0°C, Cin and 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.  
External Capacitors: The regulator require a minimum output capacitance of 330µF for proper operation. An input capacitance of 1500µF is also required. This  
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 informa-  
tion 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 20ADC with a typical value of 1µH.  
For technical support and more information, see inside back cover or visit www.ti.com  
Typical Characteristics  
PT77115V  
20-A Programmable  
Integrated Switching Regulator  
Performance Characteristics, Vin =5V (See Note A)  
Safe Operating Area Curves (See Note B)  
PT7711, VIN =5VDC  
Efficiency vs Output Current  
90  
80  
70  
60  
50  
40  
30  
20  
100  
90  
80  
70  
60  
50  
Airflow  
VOUT  
3.3V  
200LFM  
120LFM  
60LFM  
2.5V  
1.8V  
Nat conv  
0
4
8
12  
16  
20  
0
4
8
12  
16  
20  
Iout (A)  
Iout (A)  
Ripple vs Output Current  
50  
40  
30  
20  
10  
0
VOUT  
3.3V  
2.5V  
1.8V  
0
4
8
12  
16  
20  
Iout (A)  
Power Dissipation vs Output Current  
10  
8
VOUT  
6
1.8V  
2.5V  
3.3V  
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  
Tantalum Characteristics  
Capacitor Recommendations for the PT7710  
Series of Regulators and Current Boosters  
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 cur-  
rent, 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.  
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 100mEquivalent  
Series Resistance (ESR) values are the major consider-  
ations along with temperature when selecting the proper  
capacitor.  
Output Capacitors  
Capacitor Table  
The minimum required output capacitance is 330µF with  
a maximum ESR less than or equal to 100m. Failure to  
observe this requirement may lead to regulator instability or  
oscillation. Electrolytic capacitors have poor ripple perfor-  
mance 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.  
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  
Physical  
Size(mm)  
Input  
Bus  
Output  
Bus  
Vendor Number  
Current(Irms)  
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  
1
1
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
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
UPL1A681MHH6  
UPL1A182MHH6  
UPL1E331MPH6  
1
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  
10SS330M  
(Note) 10SVP330M  
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  
10V  
10V  
330  
220  
0.035Ω  
2000mA  
4.3Wx7.3L  
x4.0H  
5
6
1
2
510X337M010AS  
Tantalum  
T510/T495  
Series  
0.07Ω÷2 =0.035Ω  
>2000mA  
T495X227M010AS  
(Surface Mount)  
Sanyo Poscap  
TPB  
10V  
220  
0.04Ω  
3000mA  
7.2L x  
4.3W x  
3.1H  
6
2
10TPB220M  
(Surface Mount)  
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  
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 regu-  
lator 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 regulators  
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 units  
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  
Pin Function  
10 Vin  
11 Vin  
12 No Connect  
13 GND  
14 GND  
15 GND  
16 GND  
17 GND  
18 GND  
Pin Function  
19 GND  
20 Vout  
Table 2-1; Booster Compatibility  
1
2
3
4
5
6
7
8
9
No Connect  
No Connect  
No Connect  
No Connect  
No Connect  
No Connect  
Vin  
P7744 Booster  
(3.3V Input Bus)  
PT7745 Booster  
(5V Input Bus)  
Regulator  
PT7711  
PT7712  
PT7713  
PT7714  
PT7715  
PT7716  
21 Vout  
22 Vout  
23 Vout  
24 Vout  
25 Vout  
Vin  
Vin  
26 No Connect  
27 Sync In  
Figure 1-1; Current Booster Application Schematic  
PROGRAMMING PINS  
VID0  
VID1  
VID2  
VID3  
VID4  
REMOTE SENSE (+)  
6
4
3
2
1
26  
VID4  
-
VID0  
SNS(+)  
LIN  
VO U T  
7-11  
20-25  
VIN  
VIN  
VO  
PT771x  
1µH  
Synch  
Out  
+
+
STBY  
GND  
13-19  
SNS(-)  
12  
C IN  
C O U T  
LOAD  
5
27  
G N D  
G N D  
STBY*  
REMOTE SENSE ()  
27  
Synch In  
LIN  
PT7744/45  
Booster  
7-11  
20-25  
VO  
VIN  
1µH  
+
+
GND  
C IN  
C O U T  
13-19  
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  
ExcaliburSeries of 20-A ISRs  
Figure 3-1  
For applications requiring On/Off control of the output  
voltage, the PT7710 family of Excalibur ISRs incorpo-  
rate 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.”  
6
4
3
2
1
26  
VID4  
-
VID0  
Rem Sns (+)  
20-25  
7-11  
Vin  
Vo  
5V  
V o =3.3V  
PT7711  
Synch  
Out  
STBY  
5
GND  
13-19  
Rem Sns ()  
27  
12  
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  
L
O
A
D
+
+
C in  
C out  
Q1  
BSS138  
Inhibit  
C O M  
1
GND (pins 13-19). Connecting pin 5 to ground will set  
2
the regulator output to zero volts . This places the regu-  
C O M  
lator 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.  
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  
The standby input must be controlled with an open-  
collector (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  
1
Enable  
Disable  
2V  
–0.2V  
Open Cct.  
0.8V  
*
Sense Gnd’ (pin 12) . The waveform was measured with a  
+5V input source voltage, and 10-A resistive load.  
Istby (low)  
Vstby (o/c)  
0.5mA  
Vin  
Notes:  
Figure 3-2  
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.  
Vo (2V / Div)  
2. When placed in the standby mode, the regulator output  
discharges the output capacitance with a low impedance to  
ground.  
Iin 10A / Div)  
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.  
0
5
10  
15  
20  
25  
30  
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  
Application Notes  
PT7710 Family  
Pin-Coded Output Voltage Adjustment of the  
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 devices internal  
divider network. Discrete transistors such as the BSS138,  
2N7002, or IRLML2402 are examples of appropriate  
devices.  
PT7710 ExcaliburSeries of 20-A ISRs  
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 specifica-  
tions 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 recom-  
mended. 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 applica-  
tion 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  
SNS(+)  
20-25  
7-11  
Vin  
Vo  
+5V  
PT7710  
1µH  
Synch  
Out  
(Optional)  
STBY  
5
GND  
13-19  
SNS(-)  
12  
27  
L
O
A
D
+
+
Cin  
Cout  
STBY  
COM  
For technical support and more information, see inside back cover or visit www.ti.com  
PACKAGE OPTION ADDENDUM  
www.ti.com  
13-May-2005  
PACKAGING INFORMATION  
Orderable Device  
PT7711A  
Status (1)  
NRND  
NRND  
NRND  
NRND  
NRND  
NRND  
Package Package  
Pins Package Eco Plan (2) Lead/Ball Finish MSL Peak Temp (3)  
Qty  
Type  
Drawing  
SIP MOD  
ULE  
ENF  
27  
27  
27  
27  
27  
27  
10  
10  
10  
TBD  
TBD  
TBD  
TBD  
TBD  
TBD  
Call TI  
Call TI  
Call TI  
Call TI  
Call TI  
Call TI  
Level-1-215C-UNLIM  
Level-3-215C-168HRS  
Level-1-215C-UNLIM  
Call TI  
PT7711C  
SIP MOD  
ULE  
ENG  
ENE  
ENF  
ENG  
ENE  
PT7711N  
SIP MOD  
ULE  
PT7745A  
SIP MOD  
ULE  
PT7745C  
SIP MOD  
ULE  
Call TI  
PT7745N  
SIP MOD  
ULE  
Call TI  
(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) 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.  
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  
IMPORTANT NOTICE  
Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications,  
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