PT6936N [TI]
Analog IC ; 模拟IC\n
| 型号： | PT6936N |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | Analog IC
|
| 文件： | 总12页 (文件大小：243K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
PT6935 Series
11-A5V/3.3V-InputDualOutput
Integrated Switching Regulator
SLTS091B
Revised (9/30/2001)
Features
• Dual Outputs
• Internal Sequencing
(See Ordering Information)
• Short Circuit Protection
• 23-pin Space-Saving Package
• Solderable Copper Case
• 5V/3.3V Input
• Outputs Adjustable
• Remote Sensing (Vo1 & Vo2)
• Standby Function
• Soft-Start
• Ideal Power Source for DSPs
Pin-Out Information
Ordering Information
Description
PT 6935o = +2.5/1.8 Volts
PT 6936o = +3.3/2.5 Volts
PT 6937o = +3.3/1.8 Volts
PT 6938o = +3.3/1.2 Volts
PT 6939o = +2.5/1.2 Volts
Pin Function
The PT6935 Excalibur™ series of
power modules are dual output integrated
switching regulators (ISRs) designed to
power the latest mixed signal ICs. The
dual output provides power for both the
digital I/O logic and a DSP core from a
single module. Both output voltages are
internally sequenced during power-up
and power-down to comply with the
requirements of the latest DSP chips. Each
output is independently adjustable or can be
set to at least one alternative bus voltage
with a simple pin-strap. The modules are
made available in a space-saving solder-
able case. Features include an output
current limit and short-circuit protec-
tion.
Pin Function
1
Vo1 Sense
Connect
13
14
15
16
17
18
19
2
Vo1
2No
3
Vo1
STBY
Vin
Vo1
4
Vo1 Adjust *
NoConnect
Vo2
5
Vin
6
Vin
7
GND
GND
GND
GND
GND
Vo2
PT Series Suffix
(PT1234x)
8
0
1
2Vo
Case/Pin
Configuration
Order
Suffix
Package
9
2
2Vo
Code
10
22
2
Vo 2 Sense
2VAodjust *
Vertical
Horizontal
SMD
N
A
C
(ELF)
(ELG)
(ELH)
11
3
12Vo
1
(Reference the applicable package code drawing
for the dimensions and PC layout)
*
Vo1 and Vo2 can be pin-strapped to another
voltage. See application note on output
voltage adjustment.
Standard Application
Vo 2 Sense
STBY
Vo 1 Sense
3
2 2
1
18-21
Vo 2
Vo 1
VIN
4,5,6
PT6935
12-15
+
7-11
1 6
2 3
C 3
+
C1
C 2
C
C
C
= Req’d 330µF * electrolytic
= Req’d 330µF * electrolytic
= Optional 100µF electrolytic
G N D
G N D
1
2
3
* 300µF for Oscon® or low
ESR tantalum -see notes
For technical support and more information, see inside back cover or visit www.ti.com
PT6935 Series
11-A 5V/3.3V-Input Dual Output
Integrated Switching Regulator
General Specifications (Unless otherwise stated, Ta =25°C, Vin =5V)
PT6935 Series
Typ
Characteristic
Symbol
Conditions
Min
Max
Units
Short Circuit Current
SwitchingFrequency
Isc
ƒo
Io1 + Io2 combined
OverVin range
—
300
17
350
—
400
A
kHz
Standby (Pin 3)
Referencedto GND(pin7)
(1)
(2)
Input High Voltage
Input Low Voltage
Input Low Current
VIH
VIL
IIL
Iin standby
C2
C3
—
—
Open
+0.4
–
V
–0.1
—
—
-0.5
7
—
—
—
mA
mA
StandbyInputCurrent
ExternalOutputCapacitance
pin 3 to GND
—
330
0
25
(2)
(3)
3,300
µF
°C
330
(4)
MaximumOperating
TemperatureRange
StorageTemperature
Mechanical Shock
T
a
OverVin Range
—
Per Mil-STD-883D, Method 2002.3
1msec, ½Sine, mounted
–40
+85
T
s
–40
—
+125
°C
—
—
500
15
—
—
G’s
G’s
(5)
Mechanical Vibration
Per Mil-STD-883D, Method 2007.2
20-2000 Hz, Soldered in a PC board
Weight
Flammability
—
—
Vertical/Horizontal
MeetsUL94V-O
—
26
—
grams
Notes: (1) The Standby (pin 3) has an internal pull-up, and if it is left open circuit the module will operate when input power is applied. The open-circuit voltage is less
than 15V. Refer to the application notes for interface considerations.
(2) A value of 300µF is sufficient if Oscon® or low ESR tantalum type capacitors are used. The total combined ESR of all output capacitance at 100kHz must
be (greater than) >12 mΩ, and (less or equal to) ≤150mΩ.
(3) For operating temperatures below 0°C, Cin and Cout must have stable characteristics. Use either tantalum or Oscon® capacitors.
(4) See Safe Operating Area curves for the specific output voltage combination, or contact the factory for the appropriate derating.
(5) Only the case pins on through-hole pin configurations (N & A) must be soldered. For more information see the applicable package outline drawing.
Input/O utput Capacitors: The PT6935 series requires a 330µF electrolytic capacitor at both the input and output for proper operation (300µF for Oscon® or low ESR
tantalum). In addition, the input capacitance must be rated for a minimum of 1.0Arms ripple current. For transient or dynamic load applications, additional capacitance
may be required. Refer to the application notes for more information.
Power-up Sequencing and Vo1/Vo2 Loading
Power-up Sequencing
Vo1/Vo2 Loading
The PT6935 series of regulators provide two output voltages,
Vo1 and Vo2. Each of the output voltage combinations
offered by the PT6935 series provides power for both a low-
voltage processor core, and the associated digital support
circuitry. In addition, each output is internally sequenced
during power-up and power-down to comply with the
requirements of most DSP and µP IC’s, and their accompa-
nying chipsets. Figure 1 shows the typical waveforms of the
output voltages, Vo1 and Vo2, from the instance that either
input power is applied or the module is enabled via the
Standby pin. Following a delay of about 10 to 15 milli-secs,
the voltages at Vo1 and Vo2 rise together until Vo2 reaches
its set-point. Then Vo1 continues to rise until both output
voltages have reached full voltage.
The output voltages from the PT6935 series regulators are
independently regulated. The voltage at Vo1 is produced
by a highly efficient switching regulator. The lower output
voltage, Vo2, is derived from Vo1. The regulation method
used for Vo2 also provides control of this output voltage
during power-down. Vo2 will sink current if the voltage at
Vo1 attempts to fall below it.
The load specifications for each model of the PT6935
series gives both a ‘Typical’ (Typ) and ‘Maximum’ (Max)
load current for each output. For operation within the
product’s rating, the load currents at Vo1 and Vo2 must
comply with the following limits:-
• Io2 must be less than Io2(max).
• The sum-total current from both outputs (Io1 + Io2)
must not exceed Io1(max).
Figure 1; PT6935 Series Power-up
In the case that either Vo1 or Vo2 are adjusted to some
other value than the default output voltage, the absolute
maximum load current for Io2 must be revised to comply
with the following equation.
V1 (1V/Div)
V2 (1V/Div)
2.5
Io2 (max)
=
Adc
Vo1 – Vo2
Consult the specification table for each model of the series
for the actual numeric values.
Vstby
(10V/Div)
HORIZ SCALE: 5ms/Div
For technical support and more information, see inside back cover or visit www.ti.com
PT6935
11 Amp 5V/3.3V-Input Dual Output
Integrated Switching Regulator
PT6935 Performance Specifications (Unless otherwise stated, Ta =25°C, Vin =5V, C1 =330µF, C2 =330µF, Io1 =Io1typ, and Io2 =Io2typ)
PT6935 (2.5V/1.8V)
Characteristic
Symbol
Conditions
Min
Typ
Max
Units
(i)
(i)
(ii)
(ii)
(iii)
(iii)
OutputCurrent
Io1
Io2
Io1
Io2
Ta =25°C, natural convection
Vo1 (2.5V)
Vo2(1.8V)
Vo1 (2.5V)
Vo2(1.8V)
0.1
0
0.1
0
7
9.5
3.5
10
3.5
A
2.5
(ii)
(ii)
(iii)
(iii)
Ta =60°C, 200LFM airflow
OverIoRange
7
2.5
—
A
Input Voltage Range
Vin
3.1
5.5
VDC
Set Point Voltage Tolerance
Vo tol
Vo1
Vo2
—
—
12 38
9
mV
7
2
Temperature Variation
Line Regulation
Regtemp
–40° >Ta > +85°C
Over Vin range
—
—
—
0.5
5
2
—
10
5
%V
o
mV
Reg
Vo1
Vo2
line
Load Regulation
Regload
Over Iorange
Vo1
Vo2
—
—
5
5
10
10
mV
Total Output Voltage Variation
∆Votot
Includes set-point, line, load,
–40° >Ta > +85°C
Vo1
Vo2
—
—
—
34
2
79
—
5
—
mV
%
—
Efficiency
η
Vo Ripple (pk-pk)
Vr
20MHz bandwidth
Vo1
Vo2
—
—
—
—
—
35
35
60
60
60
—
—
—
—
—
mVpp
µs
TransientResponse
ttr
1A/µsloadstep, 50%to100%Iotyp
Voover/undershoot
Vo1
Vo2
∆Vtr
mV
Notes: (i) Io1(min) current of 0.1A can be divided between both outputs, Vo1 or Vo2. The module will operate at no load with reduced specifications.
(ii) The typical current is that which can be drawn simultaneously from both outputs under the stated operating conditions.
(iii) The sum of Io1 and Io2 must be less than Io1max, and Io2 must be less than Io2max.
PT6935 Typical Characteristics
Efficiency vs Io1 (See Note A)
Power Dissipation vs Io1 (See Note A)
85
80
75
70
65
60
10
8
VIN
VIN
6
3.3V
5.0V
5.0V
3.3V
4
2
0
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
Io1 (A) [ Io2 fixed at Io2(typ) ]
Io1 (A) [ Io2 fixed at Io2(typ) ]
Vo1 Output Ripple vs Io1 (See Note A)
Safe Operating Area, Vin =5V (See Note B)
70
60
50
40
30
20
10
0
90
80
70
60
50
40
30
20
Airflow
VIN
200LFM
120LFM
60LFM
5.0V
3.3V
Nat conv
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
Io1 (A) [ Io2 fixed at Io2(typ) ]
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
PT6936
11 Amp 5V/3.3V-Input Dual Output
Integrated Switching Regulator
PT6936 Performance Specifications (Unless otherwise stated, Ta =25°C, Vin =5V, C1 =330µF, C2 =330µF, Io1 =Io1typ, and Io2 =Io2typ)
PT6936 (3.3V/2.5V)
Characteristic
Symbol
Conditions
Min
Typ
Max
Units
(i)
(i)
(ii)
(ii)
(iii)
(iii)
OutputCurrent
Io1
Io2
Io1
Io2
Vin
Vo tol
Ta =25°C, natural convection
Vo1 (3.3V)
Vo2 (2.5V)
Vo1 (3.3V)
Vo2 (2.5V)
0.1
0
0.1
0
4.5
—
—
—
—
—
—
—
8
3
8
3
—
16
11
3
11
3
5.5
50
A
(ii)
(ii)
(iii)
(iii)
Ta =60°C, 200LFM airflow
OverIoRange
A
Input Voltage Range
Set Point Voltage Tolerance
VDC
mV
Vo1
Vo2
12 38
0.5
Temperature Variation
Line Regulation
Regtemp
Reg
–40° >Ta > +85°C
Over Vin range
—
10
5
10
10
%V
o
Vo1
Vo2
Vo1
Vo2
5
2
5
5
line
mV
mV
Load Regulation
Regload
Over Iorange
Total Output Voltage Variation
∆Votot
Includes set-point, line, load,
–40° >Ta > +85°C
Vo1
Vo2
—
—
—
2
9
—
mV
%
34
—
Efficiency
η
81
—
Vo Ripple (pk-pk)
Vr
20MHz bandwidth
Vo1
Vo2
—
—
—
—
—
35
35
60
60
60
—
—
—
—
—
mVpp
µs
TransientResponse
ttr
1A/µsloadstep, 50%to100%Iotyp
Voover/undershoot
Vo1
Vo2
∆Vtr
mV
Notes: (i) Io1(min) current of 0.1A can be divided between both outputs, Vo1 or Vo2. The module will operate at no load with reduced specifications.
(ii) The typical current is that which can be drawn simultaneously from both outputs under the stated operating conditions.
(iii) The sum of Io1 and Io2 must be less than Io1max, and Io2 must be less than Io2max.
PT6936 Typical Characteristics
Efficiency vs Io1 (See Note A)
Power Dissipation vs Io1 (See Note A)
85
80
75
70
65
60
10
8
VIN
VIN
5.0V
6
5.0V
4
2
0
0
1
2
3
4
5
6
7
8
0
1
2
3
4
5
6
7
8
Io1 out (A) [ Io2 fixed at Io2(typ) ]
Io1 out (A) [ Io2 fixed at Io2(typ) ]
Vo1 Output Ripple vs Io1 (See Note A)
Safe Operating Area, Vin =5V (See Note B)
90
80
70
60
50
40
30
20
70
60
50
40
30
20
10
0
Airflow
VIN
200LFM
120LFM
60LFM
5.0V
Nat conv
0
1
2
3
4
5
6
7
8
0
1
2
3
4
5
6
7
8
Io1 (A) [ Io2 fixed at Io2(typ) ]
Io1 out (A) [ Io2 fixed at Io2(typ) ]
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
PT6937
11 Amp 5V/3.3V-Input Dual Output
Integrated Switching Regulator
PT6937 Performance Specifications (Unless otherwise stated, Ta =25°C, Vin =5V, C1 =330µF, C2 =330µF, Io1 =Io1typ, and Io2 =Io2typ)
PT6937 (3.3V/1.8V)
Characteristic
Symbol
Conditions
Min
Typ
Max
Units
(i)
(i)
(ii)
(ii)
(iii)
(iii)
OutputCurrent
Io1
Io2
Io1
Io2
Ta =25°C, natural convection
Vo1 (3.3V)
Vo2 (1.8V)
Vo1 (3.3V)
Vo2 (1.8V)
0.1
0
0.1
0
8
2
8
2
10
A
2.25
(ii)
(ii)
(iii)
(iii)
Ta =60°C, 200LFM airflow
OverIoRange
10
A
2.25
Input Voltage Range
Vin
4.5
—
5.5
VDC
Set Point Voltage Tolerance
Vo tol
Vo1
Vo2
—
—
16
9
50
2
mV
7
Temperature Variation
Line Regulation
Regtemp
–40° >Ta > +85°C
Over Vin range
—
—
—
0.5
5
2
—
10
5
%V
o
mV
Reg
Vo1
Vo2
line
Load Regulation
Regload
Over Iorange
Vo1
Vo2
—
—
5
5
10
10
mV
Total Output Voltage Variation
∆Votot
Includes set-point, line, load,
–40° >Ta > +85°C
Vo1
Vo2
—
—
—
2
2
81
9
5
—
—
—
mV
%
Efficiency
η
Vo Ripple (pk-pk)
Vr
20MHz bandwidth
Vo1
Vo2
—
—
—
—
—
35
35
60
60
60
—
—
—
—
—
mVpp
µs
TransientResponse
ttr
1A/µsloadstep, 50%to100%Iotyp
Voover/undershoot
Vo1
Vo2
∆Vtr
mV
Notes: (i) Io1(min) current of 0.1A can be divided between both outputs, Vo1 or Vo2. The module will operate at no load with reduced specifications.
(ii) The typical current is that which can be drawn simultaneously from both outputs under the stated operating conditions.
(iii) The sum of Io1 and Io2 must be less than Io1max, and Io2 must be less than Io2max.
PT6937 Typical Characteristics
Efficiency vs Io1 (See Note A)
Power Dissipation vs Io1 (See Note A)
85
80
75
70
65
60
55
50
10
8
VIN
5.0V
VIN
5.0V
6
4
2
0
0
1
2
3
4
5
6
7
8
0
1
2
3
4
5
6
7
8
Io1 (A) [ Io2 fixed at Io2(typ) ]
Io1 (A) [ Io2 fixed at Io2(typ) ]
Vo1 Output Ripple vs Io1 (See Note A)
Safe Operating Area, Vin =5V (See Note B)
70
60
50
40
30
20
10
0
90
80
70
60
50
40
30
20
Airflow
VIN
200LFM
120LFM
60LFM
5.0V
Nat conv
0
1
2
3
4
5
6
7
8
0
1
2
3
4
5
6
7
8
Io1 (A) [ Io2 fixed at Io2(typ) ]
Io1 (A) [ Io2 fixed at Io2(typ) ]
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
PT6938
11 Amp 5V/3.3V-Input Dual Output
Integrated Switching Regulator
PT6938 Performance Specifications (Unless otherwise stated, Ta =25°C, Vin =5V, C1 =330µF, C2 =330µF, Io1 =Io1typ, and Io2 =Io2typ)
PT6938 (3.3V/1.2V)
Characteristic
Symbol
Conditions
Min
Typ
Max
Units
(i)
(i)
(ii)
(ii)
(iii)
(iii)
OutputCurrent
Io1
Io2
Io1
Io2
Vin
Vo tol
Ta =25°C, natural convection
Vo1 (3.3V)
Vo2 (1.2V)
Vo1 (3.3V)
Vo2 (1.2V)
0.1
0
0.1
0
4.5
—
—
7
8.6
1.6
8.6
1.6
5.5
50
18
A
1.6
(ii)
(ii)
(iii)
(iii)
Ta =60°C, 200LFM airflow
OverIoRange
7
A
1.6
Input Voltage Range
Set Point Voltage Tolerance
—
16
6
VDC
mV
Vo1
Vo2
Temperature Variation
Line Regulation
Regtemp
–40° >Ta > +85°C
Over Vin range
—
—
—
0.5
5
2
—
10
5
%V
o
mV
Reg
Vo1
Vo2
line
Load Regulation
Regload
Over Iorange
Vo1
Vo2
—
—
5
5
10
10
mV
Total Output Voltage Variation
∆Votot
Includes set-point, line, load,
–40° >Ta > +85°C
Vo1
Vo2
—
—
—
2
9
—
mV
%
19
—
Efficiency
η
79
—
Vo Ripple (pk-pk)
Vr
20MHz bandwidth
Vo1
Vo2
—
—
—
—
—
35
35
60
60
60
—
—
—
—
—
mVpp
µs
TransientResponse
ttr
1A/µsloadstep, 50%to100%Iotyp
Voover/undershoot
Vo1
Vo2
∆Vtr
mV
Notes: (i) Io1(min) current of 0.1A can be divided between both outputs, Vo1 or Vo2. The module will operate at no load with reduced specifications.
(ii) The typical current is that which can be drawn simultaneously from both outputs under the stated operating conditions.
(iii) The sum of Io1 and Io2 must be less than Io1max, and Io2 must be less than Io2max.
PT6938 Typical Characteristics
Efficiency vs Io1 (See Note A)
Power Dissipation vs Io1 (See Note A)
10
8
85
80
75
70
65
60
VIN
6
5.0V
5.0V
4
2
0
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
Io1 (A) [ Io2 fixed at Io2(typ) ]
Io1 (A) [ Io2 fixed at Io2(typ) ]
Vo1 Output Ripple vs Io1 (See Note A)
Safe Operating Area, Vin =5V (See Note B)
70
60
50
40
30
20
10
0
90
80
70
60
50
40
30
20
Airflow
VIN
200LFM
120LFM
60LFM
5.0V
Nat conv
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
Io1 (A) [ Io2 fixed at Io2(typ) ]
Io1 (A) [ Io2 fixed at Io2(typ) ]
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
PT6939
11 Amp 5V/3.3V-Input Dual Output
Integrated Switching Regulator
PT6939 Performance Specifications (Unless otherwise stated, Ta =25°C, Vin =5V, C1 =330µF, C2 =330µF, Io1 =Io1typ, and Io2 =Io2typ)
PT6939 (2.5V/1.2V)
Characteristic
Symbol
Conditions
Min
Typ
Max
Units
(i)
(i)
(ii)
(ii)
(iii)
(iii)
OutputCurrent
Io1
Io2
Io1
Io2
Vin
Vo tol
Ta =25°C, natural convection
Vo1 (2.5V)
Vo2 (1.2V)
Vo1 (2.5V)
Vo2 (1.2V)
0.1
0
0.1
0
3.1
—
—
—
—
—
7
2
7
2
9
A
2.2
(ii)
(ii)
(iii)
(iii)
Ta =60°C, 200LFM airflow
OverIoRange
9
A
2.2
Input Voltage Range
Set Point Voltage Tolerance
—
5.5
VDC
mV
Vo1
Vo2
12 38
6
18
—
10
5
Temperature Variation
Line Regulation
Regtemp
Reg
–40° >Ta > +85°C
Over Vin range
0.5
%V
o
mV
Vo1
Vo2
5
2
line
Load Regulation
Regload
Over Iorange
Vo1
Vo2
—
—
5
5
10
10
mV
Total Output Voltage Variation
∆Votot
Includes set-point, line, load,
–40° >Ta > +85°C
Vo1
Vo2
—
—
—
34
19
75
—
—
—
mV
%
Efficiency
η
Vo Ripple (pk-pk)
Vr
20MHz bandwidth
Vo1
Vo2
—
—
—
—
—
35
35
60
60
60
—
—
—
—
—
mVpp
µs
TransientResponse
ttr
1A/µsloadstep, 50%to100%Iotyp
Voover/undershoot
Vo1
Vo2
∆Vtr
mV
Notes: (i) Io1(min) current of 0.1A can be divided between both outputs, Vo1 or Vo2. The module will operate at no load with reduced specifications.
(ii) The typical current is that which can be drawn simultaneously from both outputs under the stated operating conditions.
(iii) The sum of Io1 and Io2 must be less than Io1max, and Io2 must be less than Io2max.
PT6939 Typical Characteristics
Efficiency vs Io1 (See Note A)
Power Dissipation vs Io1 (See Note A)
85
80
75
70
65
60
10
8
VIN
VIN
6
3.3V
5V
5V
3.3V
4
2
0
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
Io1 (A) [ Io2 fixed at Io2(typ) ]
Io1 (A) [ Io2 fixed at Io2(typ) ]
Vo1 Output Ripple vs Io1 (See Note A)
Safe Operating Area, Vin =5V (See Note B)
70
60
50
40
30
20
10
0
90
80
70
60
50
40
30
20
Airflow
VIN
200LFM
120LFM
60LFM
5V
3.3V
Nat conv
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
Io1 (A) [ Io2 fixed at Io2(typ) ]
Io1 (A) [ Io2 fixed at Io2(typ) ]
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
PT6935 Series
Capacitor Recommendations for the
Dual-Output PT6935 Regulator Series
Tantalum Capacitors
Input Capacitors:
Tantalum type capacitors can be used for the output but only
the AVX TPS series, Sprague 593D/594/595 series 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 dissipa-
tion, and lower ripple current capability. The TAJ series is
less reliable than the AVX TPS series when determining
power dissipation capability. Tantalum or Oscon® types
are recommended for applications where ambient tem-
peratures fall below 0°C.
The recommended input capacitance is determined by 1.0
ampere minimum ripple current rating and 330µF minimum
capacitance (300µF for Oscon® or low ESR tantalum).
Ripple current and <100mΩ equivalent series resistance
(ESR) values are the major considerations, along with tem-
perature, when designing with different types of capacitors.
Tantalum capacitors have a recommended minimum voltage
rating of 2 × the maximum DC voltage + AC ripple. This is
necessary to insure reliability for input voltage bus applica-
tions
Output Capacitors: C2(Required), C3(Optional)
The ESR of the required capacitor (C2) must not be greater
than 150mΩ. Electrolytic capacitors have poor ripple per-
formance at frequencies greater than 400kHz but excellent
low frequency transient response. Above the ripple fre-
quency, 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 1. The optional 100µF capacitor (C3) for V2out can
have an ESR of up to 200mΩ for optimum performance
and ripple reduction. (Note: Vendor part numbers for the
optional capacitor, C3, are not identified in the table. Use the
same series selected for C2)
Capacitor Table
Table 1 identifies the characteristics of capacitors from a
number of vendors with acceptable ESR and ripple current
(rms) ratings. The number of capacitors required at both the
input and output buses is identified for each capacitor type.
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 1: Input/Output Capacitors
Capacitor
Vendor/
Capacitor Characteristics
Quantity
Component
Series
Working
Voltage
(ESR) Equivalent
Series Resistance
85°C Maximum Ripple
Current(Irms)
Physical
Size(mm)
Input
Bus
Output
Bus
Value(µF)
Vendor Number
Panasonic
FC
25V
35V
35V
560µF
390µF
330µF
0.0065Ω
0.065Ω
0.117Ω
1205mA
1205mA
555mA
12.5x15
12.5x15
8x11.5
1
2
N/R
1
1
1
EEUFC1E561S
EEUFC1V391S
EEUFC1C331
United
16V
35V
10V
20V
330µF
470µF
330µF
150µF
0.120Ω
0.052Ω
0.025Ω
555mA
1220mA
3500mA
3200mA
8x12
10x20
10x10.5
10x10.5
N/R
1
1
1
2
LXZ16VB331M8X12LL
LXZ35VB471M10X20LL
10FS330M
Chemi-Con
LXV/FS/
LXZ
1
1
2
0.030÷2 Ω
20FS150M
35V
35V
50V
560µF
330µF
470µF
0.048Ω
0.065÷2 Ω
0.046Ω
1360mA
1020mA
1470mA
16x15
12.5x15
18x15
1
1
1
1
1
1
UPL1V561MHH6
UPL1V331MHH6
UPM1H4711MHH6
Nichicon
PL/ PM
Panasonic
FC
(Surface Mtg)
10V
35V
16V
1000µF
330µF
330µF
0.043Ω
0.065Ω
0.150Ω
1205mA
1205mA
670mA
12x16.5
12.5x16
10x10.2
1
1
N/R
1
1
1
EEVFC1A102LQ
EEVFC1V331LQ
EEVFC1C331P
Oscon- SS
SV
10V
10V
20V
330µF
330µF
150µF
0.025Ω
0.025Ω
0.024÷2 Ω
>3500mA
>3800mA
3600mA
10.0x10.5
10.3x10.3
10.3x10.3
1
1
2
1
1
2
10SS330M
10SV300M
20SV150M
SV= Surface Mount
AVX
Tantalum
TPS
10V
10V
10V
330µF
330µF
220µF
0.100÷2 Ω
0.100÷2 Ω
0.095Ω
>2500mA
>3000mA
>2000mA
7.3Lx
4.3Wx
4.1H
2
2
2
1
1
2
TPSV337M010R0100
TPSV337M010R0060
TPSV227M0105R0100
Kemet
T510/
T495
10V
10V
330µF
220µF
0.033Ω
0.07Ω÷2 =0.035Ω
1400mA
>2000mA
7.3Lx5.7W
x 4.0H
2
2
1
2
T510X337M010AS
T495X227M010AS
7.3Lx
6.0Wx
4.1H
Sprague
594D
10V
10V
330µF
220µF
0.045Ω
0.065Ω
2350mA
>2000mA
2
2
1
2
4D337X0010R2T
594D227X0010D2T
N/R –Not recommended. The voltage rating does not meet the minimum operating limits.
For technical support and more information, see inside back cover or visit www.ti.com
Application Notes
PT6935 Series
Adjusting the Output Voltage of the PT6935
Dual Output Voltage ISRs
4. Adjusting the Vo1 output voltage of either the PT6935
(2.5V/1.8V model) or PT6939 (2.5V/1.2V) higher than
the factory pre-trimmed output voltage, may increase
the minimum input voltage specified for the part. These
models must comply with the following requirements.
Each output voltage from the PT6935 series of ISRs can be
independantly adjusted higher or lower than the factory
trimmed pre-set voltage. The voltages, Vo1 and Vo2 may
each be adjusted either up or down using a single external
PT6935/PT6939:
1
resistor . Table 1 gives the adjustment range for both Vo1
Vin(min) =(Va + 0.6)V or 3.1V,
and Vo2 for each model in the series as Va(min) and Va(max).
whichever is greater.
2
.
Note that Vo2 must always be lower than Vo1
5. Never connect capacitors to either the Vo1 Adjust or
Vo2 Adjust pins. Any capacitance added to these control
pins will affect the stability of the respective regulated
output.
Vo1 Adjust Up: To increase the output, add a resistor R4
between pin 16 (V1 Adjust) and pins 7-11 (GND) .
1
Vo1 Adjust Down: Add a resistor (R3), between pin 16
1
(Vo1 Adjust) and pin 1 (Vo1 Sense) .
6. Adjusting either voltage (Vo1 or Vo2) may increase the
power dissipation in the regulator, and change the
maximum current available at either output. Consult
the note on p.2 of the data sheet regarding Vo1/Vo2
loading.
Vo2 Adjust Up: Add a resistor R2 between pin 23
1
(Vo2 Adjust) and pins 7-11 (GND) .
Vo2 Adjust Down: Add a resistor (R1) between pin 23
1
(Vo2 Adjust) and pin 22 (Vo2 Sense) .
Refer to Figure 1 and Table 2 for both the placement and value of
the required resistor.
The adjust up and adjust down resistor values can also be
calculated using the following formulas. Be sure to select
the correct formula parameter from Table 1 for the output
and model being adjusted.
Notes:
1. Use only a single 1% resistor in either the (R3) or R4
location to adjust Vo1, and in the (R1) or R2 location to
adjust Vo2. Place the resistor as close to the ISR as
possible.
10 (Va – Vr )
(R1) or (R3)
=
– Rs
kΩ
Vo – Va
10 · Vr
Va – Vo
2 . Vomust always be at least 0.2V lower than Vo1.
(R2) or (R4)
=
– Rs
kΩ
2
3. Both the Vo1 and Vo2 may be adjusted down to an
alternative bus voltage by making, (R3) or (R1)
respectively, a zero ohm link. Refer to the Table 1
footnotes for guidance.
Where: Vo = Original output voltage, (Vo1 or Vo2)
Va = Adjusted output voltage
Vr = The reference voltage from Table 1
Rs = The series resistance from Table 1
Figure 1
22
1
Vo2(sns) Vo1(sns)
18
12
-
-
21
15
Vo2
Vo2
4,5,6
Vin
VIN
PT6935
Vo1
Vo1
GND
Vo2(adj) Vo1 (adj)
23 16
STBY
3
7 - 11
(R3)
(R1)
Adj Down
L
O
A
D
L
O
A
D
+
+
+
C1
C2
C3
R4
R2
Adjust Up
COM
COM
Adjust Vo 1
Adjust Vo 2
For technical support and more information, see inside back cover or visit www.ti.com
Application Notes
PT6935 Series
Table 1
ADJUSTMENT RANGE AND FORMULA PARAMETERS
Vo1 Bus
Vo2 Bus (2)
Series Pt #
Adj. Resistor
PT6935/39
(R3)/R4
PT6936/37/38
(R3)/R4
PT6938/39
(R1)/R2
PT6935/37
(R1)/R2
PT6936
(R1)/R2
Vo(nom)
Va(min)
Va(max)
Vr
2.5V
3.3V
1.2V
1.8V
2.5V
*
*
†
†
†
1.8V
2.5V
1.0V
1.5V
1.8V
(4)
#
3.6V
3.6V
1.27V
15.4
1.5V
2.4V
1.0V
16.9
3.0
1.0V
11.5
1.27V
7.5
0.6125V
20.0
Rs (kΩ)
Ref. Note 3:
* (R3) = Zero-ohm link
†(R1) = Zero-ohm link
(R2) = Zero-ohm link
#
Table 2
ADJUSTMENT RESISTOR VALUES
Vo1 Bus
Vo2 Bus
Series Pt #
Adj. Resistor
PT6935/39
(R3)/R4
PT6936/37/38
(R3)/R4
Series Pt #
Adj. Resistor
PT6938/39
(R1)/R2
PT6935/37
(R1)/R2
PT6936
(R1)/R2
Vo(nom)
2.5V
3.3V
Vo(nom)
1.2V
1.8V
2.5V
Va(req’d)
1.8
Va(req’d)
1.0
(0.0)
(0.0)kΩ
(9.2)kΩ
(28.8)kΩ
(87.5)kΩ
1.05
1.1
1.15
1.2
1.25
1.3
1.35
1.4
1.45
1.5
1.55
1.6
1.65
1.7
1.75
1.8
1.85
1.9
1.95
2.0
2.05
2.1
1.85
1.9
1.95
2.0
2.05
2.1
2.2
2.3
2.4
2.5
2.6
2.7
2.8
2.9
3.0
3.1
3.210.6k
3.3
3.4
3.5
(1.4)kΩ
(3.0)kΩ
(4.9)kΩ
(7.1)kΩ
(9.8)kΩ
(13.3)kΩ
(23.5)kΩ
(44.0)kΩ
(106.0)kΩ
101.5kΩ
41.2kΩ
20.8kΩ
10.6kΩ
4.5kΩ
(0.0)kΩ
(3.6)kΩ
(8.4)kΩ
(15.2)kΩ
(25.4)kΩ
(42.3)kΩ
(76.1)kΩ
(178.0)kΩ
0.0kΩ
(0.0)kΩ
(5.1)kΩ
(13.1)kΩ
(26.4)kΩ
(53.1)kΩ
(133.0)kΩ
120.0kΩ
56.0kΩ
34.8kΩ
24.3kΩ
17.9kΩ
13.7kΩ
Ω
(0.0)kΩ
(1.6)kΩ
(3.5)kΩ
(5.8)kΩ
(8.5)kΩ
(11.8)kΩ
(16.0)kΩ
(28.5)kΩ
(53.5)kΩ
(129.0)kΩ
183.0kΩ
83.1kΩ
49.8kΩ
33.1kΩ
23.1kΩ
16.4kΩ
8.1kΩ
8.4kΩ
6.6kΩ
5.2kΩ
4.1kΩ
112.0k
48.1k
26.9k
3.6
2.2
2.3
2.4
2.5
3.1kΩ
0.0kΩ
2.6
2.7
2.8
2.9
88.5kΩ
38.5kΩ
21.8kΩ
13.5kΩ
8.5kΩ
3.0
R1/R3 = (Blue), R2/R4 = Black
For technical support and more information, see inside back cover or visit www.ti.com
Application Notes
PT6935 Series
Figure 1
Using the Standby Function on the PT6935
Series of Dual-Output Voltage Regulators
22
1
Vo2(sns) Vo1(sns)
Both output voltages of the 23-pin PT6935 dual-output
converter may be disabled using the regulator’s ‘Standby’
function. This function may be used in applications that
require power-up/shutdown sequencing, or wherever there
is a requirement to control the output voltage On/Off status
with external circuitry.
18
12
-
-
21
15
Vo2
Vo 2
Vo 1
4, 5,
6
VI N
V in
PT6935
Vo1
GND
Vo2(adj) Vo1(adj)
23 16
STBY
3
7 - 11
+
C1
+
+
C2
C3
Q1
BSS138
The standby function is provided by the STBY* control
(pin 3). If pin 3 is left open-circuit the regulator operates
normally, and provides a regulated output at both Vo1 (pins
12–15) and Vo2 (pins 18–21) whenever a valid supply volt-
age is applied to Vin (pins 4, 5, & 6) with respect to GND
Inhibit
C O M
C O M
1
(pins 7-11). If a low voltage is then applied to pin-3 both
regulator outputs will be simultaneously disabled and the
input current drawn by the ISR will drop to a typical value
of 7mA. The standby control may also be used to hold-off
both regulator outputs during the period that input power is
applied.
Turn-On Time: Turning Q1 in Figure 1 off removes the low-
voltage signal at pin 3 and enables the PT6935 regulator.
Following a delay of about 15ms, Vo1 and Vo2 rise together
until the lower voltage, Vo2, reaches its set output. Vo1
continues to rise until both outputs reach full regulation
voltage. The total power-up time is less than 30ms, and is
relatively independent of load, temperature, and output
capacitance. Figure 2 shows waveforms of the output voltages,
Vo1 and Vo2, for a PT6937 (3.3V/1.8V). The turn-off of
Q1 corresponds to the rise in VSTBY. The waveforms were
measured with a 5V input voltage, and with resistive loads
of 4.5A and 1.9A at the Vo1 and Vo2 outputs respectively.
The standby pin is ideally controlled using an open-collector
(or open-drain) discrete transistor (See Figure 1). The
open-circuit voltage is typically 12.6V. Table 1 gives the
circuit parameters for this control input.
1, 2
Table 1 Standby Control Parameters
Parameter
Min
Max
Enable (VIH
Disable (VIL
)
)
—
–0.1V
Open circuit
0.4V
1
Figure 2
2
VSTBY (open circuit)
ISTBY (IIL
12.6V
—
15V
–0.5mA
)
Notes:
1. The standby control input is Not compatible with TTL or
other devices that incorporate a totem-pole output drive. Use
only a true open-collector device, preferably a discrete bipolar
transistor (or MOSFET). To ensure the regulator output is
disabled, the control pin must be pulled to less than 0.4Vdc
with a low-level 0.5mA sink to ground.
V1 (1V/Div)
V2 (1V/Div)
Vstby
(10V/Div)
2The standby control inrpequut ires no external pull-up resistor.
The open-circuit voltage of the STBY* pin is typically 12.6V.
3. When the regulator output is disabled the current drawn from
the input source is typically reduced to 7mA.
HORIZ SCALE: 5ms/Div
For technical support and more information, see inside back cover or visit www.ti.com
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