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Technical content

Features

  • Dual Outputs (See Ordering Information)
  • 5V/3.3V Input
  • Outputs Adjustable
  • Remote Sensing (Vo1 & Vo2)
  • Standby Function
  • Soft-Start

Description

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.

  • Internal Sequencing
  • Short Circuit Protection
  • 23-pin Space-Saving Package
  • Solderable Copper Case
  • Ideal Power Source for DSPs C1 = Req’d 330µF * electrolytic C2 = Req’d 330µF * electrolytic C3 = Optional 100µF electrolytic * 300µF for Oscon® or low ESR tantalum -see notes PT6935 C 2 GND V IN GND 4,5,6 7-11 12-15 18-21 C 1 C 3 Vo 2 Sense Vo 1 Sense STBY Vo 1 Vo 2 PT6935 Series 11-A 5V/3.3V-Input Dual Output Integrated Switching Regulator SLTS091B Revised (9/30/2001)

Ordering Information

PT6935/G6F = +2.5/1.8 Volts PT6936/G6F = +3.3/2.5 Volts PT6937/G6F = +3.3/1.8 Volts PT6938/G6F = +3.3/1.2 Volts PT6939/G6F = +2.5/1.2 Volts Pin Function 1V o 1 Sense 2No Connect

3 STBY

10 GND

11 GND

13 Vo 1

14 Vo 1

15 Vo 1

16 Vo 1 Adjust *

17 No Connect

18 Vo 2

19 Vo 2

22 Vo 2 Sense

23V o 2 Adjust * *V o 1 and V o2 can be pin-strapped to another voltage. See application note on output voltage adjustment. Pin-Out Information PT Series Suffix (PT1234x) Case/Pin Order Package Configuration Suffix Code Vertical N (ELF) Horizontal A (ELG) SMD C (ELH) (Reference the applicable package code drawing for the dimensions and PC layout) Not Recommended For New Designs

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 Power-up Sequencing and Vo1/Vo2 Loading Power-up Sequencing 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, Vo 1 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 Vo 1 and Vo2 rise together until Vo2 reaches its set-point. Then Vo1 continues to rise until both output voltages have reached full voltage. Vo1/Vo2 Loading The output voltages from the PT6935 series regulators are independently regulated. The voltage at Vo 1 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 Vo 1 and Vo2 must comply with the following limits:-

  • I o2 must be less than Io2(max).
  • The sum-total current from both outputs (Io 1 + Io2) must not exceed Io1(max). 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 Io 2 must be revised to comply with the following equation. Io2 (max) = 2.5 Adc Vo1 – Vo2 Consult the specification table for each model of the series for the actual numeric values. Figure 1; PT6935 Series Power-up V1 (1V/Div) V2 (1V/Div) Vstby (10V/Div) HORIZ SCALE: 5ms/Div General Specifications (Unless otherwise stated, Ta =25°C, Vin =5V) PT6935 Series Characteristic Symbol Conditions Min Typ Max Units Short Circuit Current Isc Io1 + Io2 combined — 17 — A Switching Frequency ƒo Over Vin range 300 350 400 kHz Standby (Pin 3) Referenced to GND (pin 7) Input High Voltage VIH — — Open (1) V Input Low Voltage V IL –0.1 — +0.4 Input Low Current IIL — -0.5 – mA Standby Input Current Iin standby pin 3 to GND — 7 25 mA External Output Capacitance C2 330 (2) — 3,300 (2) µFC3 0 — 330 Maximum Operating T a Over Vin Range –40 (3) — +85 (4) °C Temperature Range Storage Temperature Ts — –40 — +125 °C Mechanical Shock Per Mil-STD-883D, Method 2002.3 1 msec, ½ Sine, mounted — 500 — G’s Mechanical Vibration Per Mil-STD-883D, Method 2007.2 — 15 (5) —G ’ s 20-2000 Hz, Soldered in a PC board Weight — Vertical/Horizontal — 26 — grams Flammability — Meets UL 94V-O 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/Output 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. Not Recommended For New Designs

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 01234567 Iout (A ) Ambient Temperature (°C) 200LFM 120LFM 60LFM Nat conv Airflow PT6935 Typical Characteristics Efficiency vs Io1 (See Note A) Vo1 Output Ripple vs Io 1 (See Note A) Power Dissipation vs Io 1 (See Note A) Safe Operating Area, V in =5V (See Note B) 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 01234567 Io1 (A) [ Io2 fixed at Io2(typ) ] Efficiency - % 3.3V 5.0V VIN 01234567 Io1 (A) [ Io2 fixed at Io2(typ) ] Ripple - mV 5.0V 3.3V VIN 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 Input Voltage Range Vin Over Io Range 3.1 — 5.5 VDC Set Point Voltage Tolerance Vo tol Vo1 — ±12±38 mVVo2 —± 9± 27 Temperature Variation Regtemp –40° >Ta > +85°C — ±0.5 — %V o Line Regulation Regline Over Vin range Vo1 — ±5 ±10 mV Vo2 —± 2± 5 Load Regulation Reg load Over Io range Vo1 — ±5 ±10 mVVo2 — ±5 ±10 Total Output Voltage Variation ∆Votot Includes set-point, line, load, Vo1 — ±34 — mV–40° >Ta > +85°C Vo2 —± 25 — Efficiency η —7 9—% Vo Ripple (pk-pk) Vr 20MHz bandwidth Vo1 —3 5— mVppVo2 —3 5— Transient Response ttr 1A/µs load step, 50% to 100% Iotyp — 60 — µs ∆Vtr Vo over/undershoot Vo1 — ±60 — mVVo2 — ±60 — Notes: (i) Io 1(min) current of 0.1A can be divided between both outputs, V o1 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. 01234567 Io1 (A) [ Io2 fixed at Io2(typ) ] Pd - Watts 5.0V 3.3V VIN Not Recommended For New Designs

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 Typical Characteristics Efficiency vs Io1 (See Note A) Vo1 Output Ripple vs Io 1 (See Note A) Power Dissipation vs Io 1 (See Note A) Safe Operating Area, V in =5V (See Note B) 012345678 Io1 out (A) [ Io2 fixed at Io2(typ) ] Ripple - mV 5.0V VIN 012345678 Io1 (A) [ Io2 fixed at Io2(typ) ] Ambient Temperature (°C) 200LFM 120LFM 60LFM Nat conv Airflow 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 012345678 Io1 out (A) [ Io2 fixed at Io2(typ) ] Efficiency - % 5.0V VIN 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 Output Current Io1 Ta =25°C, natural convection Vo 1 (3.3V) 0.1 (i) 8 (ii) 11 (iii) AIo2 Vo2 (2.5V) 0 3 (ii) 3 (iii) Io1 Ta =60°C, 200LFM airflow Vo 1 (3.3V) 0.1 (i) 8 (ii) 11 (iii) AIo2 Vo2 (2.5V) 0 3 (ii) 3 (iii) Input Voltage Range Vin Over Io Range 4.5 — 5.5 VDC Set Point Voltage Tolerance Vo tol Vo1 — ±16 ±50 mVVo2 — ±12±38 Temperature Variation Regtemp –40° >Ta > +85°C — ±0.5 — %V o Line Regulation Regline Over Vin range Vo1 — ±5 ±10 mVVo2 —± 2± 5 Load Regulation Reg load Over Io range Vo1 — ±5 ±10 mVVo2 — ±5 ±10 Total Output Voltage Variation ∆Votot Includes set-point, line, load, Vo1 —± 29 — mV–40° >Ta > +85°C Vo2 — ±34 — Efficiency η —8 1—% Vo Ripple (pk-pk) Vr 20MHz bandwidth Vo1 —3 5— mVppVo2 —3 5— Transient Response ttr 1A/µs load step, 50% to 100% Iotyp — 60 — µs ∆Vtr Vo over/undershoot Vo1 — ±60 — mVVo2 — ±60 — Notes: (i) Io 1(min) current of 0.1A can be divided between both outputs, V o1 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. 012345678 Io1 out (A) [ Io2 fixed at Io2(typ) ] Pd - Watts 5.0V VIN Not Recommended For New Designs

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 Typical Characteristics Efficiency vs Io1 (See Note A) Vo1 Output Ripple vs Io 1 (See Note A) Power Dissipation vs Io 1 (See Note A) Safe Operating Area, V in =5V (See Note B) 012345678 Io1 (A) [ Io2 fixed at Io2(typ) ] Efficiency - % 5.0V VIN 012345678 Io1 (A) [ Io2 fixed at Io2(typ) ] Ripple - mV 5.0V VIN 012345678 Io1 (A ) [ Io2 fixed at Io2(typ) ] Ambient Temperature (°C) 200LFM 120LFM 60LFM Nat conv Airflow 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 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 Output Current Io1 Ta =25°C, natural convection Vo 1 (3.3V) 0.1 (i) 8 (ii) 10 (iii) AIo2 Vo2 (1.8V) 0 2 (ii) 2.25(iii) Io1 Ta =60°C, 200LFM airflow Vo 1 (3.3V) 0.1 (i) 8 (ii) 10 (iii) AIo2 Vo2 (1.8V) 0 2 (ii) 2.25(iii) Input Voltage Range Vin Over Io Range 4.5 — 5.5 VDC Set Point Voltage Tolerance Vo tol Vo1 — ±16 ±50 mVVo2 —± 9± 27 Temperature Variation Regtemp –40° >Ta > +85°C — ±0.5 — %V o Line Regulation Regline Over Vin range Vo1 — ±5 ±10 mV Vo2 —± 2± 5 Load Regulation Reg load Over Io range Vo1 — ±5 ±10 mVVo2 — ±5 ±10 Total Output Voltage Variation ∆Votot Includes set-point, line, load, Vo1 —± 29 — mV–40° >Ta > +85°C Vo2 —± 25 — Efficiency η —8 1—% Vo Ripple (pk-pk) Vr 20MHz bandwidth Vo1 —3 5— mVppVo2 —3 5— Transient Response ttr 1A/µs load step, 50% to 100% Iotyp — 60 — µs ∆Vtr Vo over/undershoot Vo1 — ±60 — mVVo2 — ±60 — Notes: (i) Io 1(min) current of 0.1A can be divided between both outputs, V o1 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. 012345678 Io1 (A) [ Io2 fixed at Io2(typ) ] Pd - Watts 5.0V VIN Not Recommended For New Designs

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 Typical Characteristics Efficiency vs Io1 (See Note A) Vo1 Output Ripple vs Io 1 (See Note A) Power Dissipation vs Io 1 (See Note A) Safe Operating Area, V in =5V (See Note B) 01234567 Io1 (A) [ Io2 fixed at Io2(typ) ] Ripple - mV 5.0V VIN 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 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 Input Voltage Range Vin Over Io Range 4.5 — 5.5 VDC Set Point Voltage Tolerance Vo tol Vo1 — ±16 ±50 mVVo2 — ±6 ±18 Temperature Variation Regtemp –40° >Ta > +85°C — ±0.5 — %V o Line Regulation Regline Over Vin range Vo1 — ±5 ±10 mV Vo2 —± 2± 5 Load Regulation Reg load Over Io range Vo1 — ±5 ±10 mVVo2 — ±5 ±10 Total Output Voltage Variation ∆Votot Includes set-point, line, load, Vo1 —± 29 — mV–40° >Ta > +85°C Vo2 — ±19 — Efficiency η —7 9—% Vo Ripple (pk-pk) Vr 20MHz bandwidth Vo1 —3 5— mVppVo2 —3 5— Transient Response ttr 1A/µs load step, 50% to 100% Iotyp — 60 — µs ∆Vtr Vo over/undershoot Vo1 — ±60 — mVVo2 — ±60 — Notes: (i) Io 1(min) current of 0.1A can be divided between both outputs, V o1 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. 01234567 Io1 (A) [ Io2 fixed at Io2(typ) ] Efficiency - % 5.0V VIN 01234567 Io1 (A) [ Io2 fixed at Io2(typ) ] Pd - Watts 5.0V 01234567 Io1 (A) [ Io2 fixed at Io2(typ) ] Ambient Temperature (°C) 200LFM 120LFM 60LFM Nat conv Airflow Not Recommended For New Designs

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 Typical Characteristics Efficiency vs Io1 (See Note A) Vo1 Output Ripple vs Io 1 (See Note A) Power Dissipation vs Io 1 (See Note A) Safe Operating Area, V in =5V (See Note B) 01234567 Io1 (A) [ Io2 fixed at Io2(typ) ] Ambient Temperature (°C) 200LFM 120LFM 60LFM Nat conv Airflow 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 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 Output Current Io1 Ta =25°C, natural convection Vo 1 (2.5V) 0.1 (i) 7 (ii) 9 (iii) AIo2 Vo2 (1.2V) 0 2 (ii) 2.2 (iii) Io1 Ta =60°C, 200LFM airflow Vo 1 (2.5V) 0.1 (i) 7 (ii) 9 (iii) AIo2 Vo2 (1.2V) 0 2 (ii) 2.2 (iii) Input Voltage Range Vin Over Io Range 3.1 — 5.5 VDC Set Point Voltage Tolerance Vo tol Vo1 — ±12±38 mVVo2 — ±6 ±18 Temperature Variation Regtemp –40° >Ta > +85°C — ±0.5 — %V o Line Regulation Regline Over Vin range Vo1 — ±5 ±10 mV Vo2 —± 2± 5 Load Regulation Reg load Over Io range Vo1 — ±5 ±10 mVVo2 — ±5 ±10 Total Output Voltage Variation ∆Votot Includes set-point, line, load, Vo1 — ±34 — mV–40° >Ta > +85°C Vo2 — ±19 — Efficiency η —7 5—% Vo Ripple (pk-pk) Vr 20MHz bandwidth Vo1 —3 5— mVppVo2 —3 5— Transient Response ttr 1A/µs load step, 50% to 100% Iotyp — 60 — µs ∆Vtr Vo over/undershoot Vo1 — ±60 — mVVo2 — ±60 — Notes: (i) Io 1(min) current of 0.1A can be divided between both outputs, V o1 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. 01234567 Io1 (A) [ Io2 fixed at Io2(typ) ] Efficiency - % 3.3V VIN 01234567 Io1 (A) [ Io2 fixed at Io2(typ) ] Ripple - mV 3.3V V IN 01234567 Io1 (A) [ Io2 fixed at Io2(typ) ] Pd - Watts 3.3V VIN Not Recommended For New Designs

For technical support and more information, see inside back cover or visit www.ti.com Table 1: Input/Output Capacitors N/R –Not recommended. The voltage rating does not meet the minimum operating limits. Capacitor Recommendations for the Dual-Output PT6935 Regulator Series Input Capacitors: 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: C 2(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 (C 3) 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) PT6935 Series Tantalum 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. 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. Application Notes r o t i c a p a C / r o d n e V t n e n o p m o C s e i r e S s c i t s i r e t c a r a h C r o t i c a p aCy t i t n a u Q g n i k r o W e g a t l oV) F µ ( e u l a V t n e l a v i u q E ) R S E ( e c n a t s i s e R s e i r e S e l p p i R m u m i x a M C ° 5 8 ) s m r I ( t n e r r u C l a c i s y h P ) m m ( e z i S t u p n I s u B t u p t u O s u B r e b m u N r o d n e V c i n o s a n a P C F V 5 2 V 5 3 V 5 3 F µ 0 6 5 F µ 0 9 3 F µ 0 3 3 5 6 0 0 . 0Ω 5 6 0 . 0Ω 7 1 1 . 0Ω A m 5 0 2 1 A m 5 0 2 1 A m 5 5 5 5 1 x 5 . 2 1 5 1 x 5 . 2 1 5 . 1 1 x 8 R / N S 1 6 5 E 1 C F U E E S 1 9 3 V 1 C F U E E 1 3 3 C 1 C F U E E d e t i n U n o C - i m e h C / S F / V X L Z X L V 6 1 V 5 3 V 0 1 V 0 2 F µ 0 3 3 F µ 0 7 4 F µ 0 3 3 F µ 0 5 1 0 2 1 . 0Ω 2 5 0 . 0Ω 5 2 0 . 0Ω 0 3 0 . 0÷2 Ω A m 5 5 5 A m 0 2 2 1 A m 0 0 5 3 A m 0 0 2 3 2 1 x 8 0 2 x 0 1 5 . 0 1 x 0 1 5 . 0 1 x 0 1 R / N L L 2 1 X 8 M 1 3 3 B V 6 1 Z X L L L 0 2 X 0 1 M 1 7 4 B V 5 3 Z X L M 0 3 3 S F 0 1 M 0 5 1 S F 0 2 n o c i h c i N M P / L P V 5 3 V 5 3 V 0 5 0 65F µ 0 33F µ 0 74F µ 8 4 0 . 0Ω 5 6 0 . 0÷2 Ω 6 4 0 . 0Ω A m 0 6 3 1 A m 0 2 0 1 A m 0 7 4 1 5 1 x 6 1 5 1 x 5 . 2 1 5 1 x 8 1

6 H H M 1 6 5 V 1 L P U

6 H H M 1 3 3 V 1 L P U

6 H H M 1 1 7 4 H 1 M P U

) g t M e c a f r u S ( V 0 1 V 5 3 V 6 1 0 0 01F µ 0 33F µ 0 33F µ 3 4 0 . 0Ω 5 6 0 . 0Ω 0 5 1 . 0Ω A m 5 0 2 1 A m 5 0 2 1 A m 0 7 6 5 . 6 1 x 2 1 6 1 x 5 . 2 1 2 . 0 1 x 0 1 R / N Q L 2 0 1 A 1 C F V E E Q L 1 3 3 V 1 C F V E E P 1 3 3 C 1 C F V E E S S - n o c s O V S V 0 1 V 0 1 V 0 2 0 33F µ F µ 0 3 3 0 51F µ 5 2 0 . 0Ω 5 2 0 . 0Ω 4 2 0 . 0÷2 Ω A m 0 0 5 3 > A m 0 0 8 3 > A m 0 0 6 3 5 . 0 1 x 0 . 0 1 3 . 0 1 x 3 . 0 1 3 . 0 1 x 3 . 0 1 M 0 3 3 S S 0 1 M 0 0 3 V S 0 1 M 0 5 1 V S 0 2 t n u o M e c a f r u S = V S X V A m u l a t n a T S P T V 0 1 V 0 1 V 0 1 F µ 0 3 3 F µ 0 3 3 F µ 0 2 2 0 0 1 . 0÷2 Ω 0 0 1 . 0÷2 Ω 5 9 0 . 0Ω A m 0 0 5 2 > A m 0 0 0 3 > A m 0 0 0 2 > x L 3 . 7 x W 3 . 4 H 1 . 4 0 0 1 0 R 0 1 0 M 7 3 3 V S P T 0 6 0 0 R 0 1 0 M 7 3 3 V S P T 0 0 1 0 R 5 0 1 0 M 7 2 2 V S P T t e m e K / 0 1 5 T 5 9 4 T V 0 1 V 0 1 F µ 0 3 3 F µ 0 2 2 3 3 0 . 0Ω 7 0 . 0÷ Ω 5 3 0 . 0 = 2Ω A m 0 0 4 1 A m 0 0 0 2 > W 7 . 5 x L 3 . 7 H 0 . 4 x S A 0 1 0 M 7 3 3 X 0 1 5 T S A 0 1 0 M 7 2 2 X 5 9 4 T e u g a r p S D 4 9 5 V 0 1 V 0 1 F µ 0 3 3 F µ 0 2 2 5 4 0 . 0Ω 5 6 0 . 0Ω A m 0 5 3 2 A m 0 0 0 2 > x L 3 . 7 x W 0 . 6 H 1 . 4 T 2 R 0 1 0 0 X 7 3 3 D 4 T 2 D 0 1 0 0 X 7 2 2 D 4 9 5 Not Recommended For New Designs

For technical support and more information, see inside back cover or visit www.ti.com Adjusting the Output Voltage of the PT6935 Dual Output Voltage ISRs 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, Vo 1 and Vo2 may each be adjusted either up or down using a single external resistor 1. Table 1 gives the adjustment range for both Vo1 and Vo2 for each model in the series as Va(min) and Va(max). Note that Vo2 must always be lower than Vo1 2. 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 (Vo1 Adjust) and pin 1 (Vo1 Sense) 1. Vo2 Adjust Up: Add a resistor R2 between pin 23 (Vo2 Adjust) and pins 7-11 (GND) 1. Vo2 Adjust Down:Add a resistor (R1) between pin 23 (Vo2 Adjust) and pin 22 (Vo2 Sense) 1. Refer to Figure 1 and Table 2 for both the placement and value of the required resistor. 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. 2.V o2 must always be at least 0.2V lower than Vo1. 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. Figure 1 C 1 C 2 C 3 (R3) (R1) L O A D L O A D Adj Down Adjust Up V IN COM COM Vo 2 Vo 1 PT6935 18 - 21 237 - 11 4,5,6 Vin Vo 2 GND Vo 2(adj) Vo 1(sns) Vo 1 (adj) 12 - 15Vo 1 Vo 2(sns) STBY Adjust Vo1 Adjust Vo2 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. PT6935/PT6939: V in(min) =(Va + 0.6)V or 3.1V, whichever is greater. 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. 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 Vo 1/Vo2 loading. 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. (R1) or (R3) = 10 (Va – Vr ) – Rs kΩ Vo – Va (R2) or (R4) = 10 · Vr – Rs kΩ Va – Vo 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 PT6935 Series Not Recommended For New Designs

For technical support and more information, see inside back cover or visit www.ti.com Application Notes 1.8 (0.0) 1.85 (1.4)kΩ 1.9 (3.0)kΩ 1.95 (4.9)kΩ 2.0 (7.1)kΩ 2.05 (9.8)kΩ 2.1 (13.3)kΩ 2.2 (23.5)kΩ 2.3 (44.0)kΩ 2.4 (106.0)kΩ 2.5 (0.0)kΩ 2.6 120.0k Ω (3.6)kΩ 2.8 34.8k Ω (15.2)kΩ 2.9 24.3k Ω (25.4)kΩ 3.0 17.9k Ω (42.3)kΩ 3.1 13.7k Ω (76.1)kΩ 3.210.6k Ω (178.0)kΩ 3.3 8.4k Ω 3.4 6.6k Ω 112.0k 3.5 5.2k Ω 48.1k 3.6 4.1k Ω 26.9k R1/R3 = (Blue), R2/R4 = Black Vo1 Bus Series Pt # PT6935/39 PT6936/37/38 Adj. Resistor (R3)/R4 (R3)/R4 Vo(nom) 2.5V 3.3V Va(req’d) Table 1 ADJUSTMENT RANGE AND FORMULA PARAMETERS Vo1 Bus Vo2 Bus (2) Series Pt # PT6935/39 PT6936/37/38 PT6938/39 PT6935/37 PT6936 Adj. Resistor (R3)/R4 (R3)/R4 (R1)/R2 (R1)/R2 (R1)/R2 Ref. Note 3: * (R3) = Zero-ohm link †(R1) = Zero-ohm link # (R2) = Zero-ohm link 1.0 (0.0)kΩ 1.05 (9.2)kΩ 1.1 (28.8)kΩ 1.15 (87.5)kΩ 1.2 1.25 101.5k Ω 1.3 41.2k Ω 1.35 2 0.8kΩ 1.4 10.6k Ω 1.45 4.5k Ω 1.5 0.0k Ω (0.0)kΩ 1.55 (5.1)kΩ 1.6 (13.1)kΩ 1.65 (26.4)kΩ 1.7 (53.1)kΩ 1.75 (133.0)kΩ 1.8 (0.0)kΩ 1.85 183.0kΩ (1.6)kΩ 1.9 83.1kΩ (3.5)kΩ 2.0 33.1kΩ (8.5)kΩ 2.05 23.1kΩ (11.8)kΩ 2.2 8.1kΩ (28.5)kΩ 2.3 3.1kΩ (53.5)kΩ 2.5 2.6 88.5kΩ 2.7 38.5kΩ 2.8 21.8kΩ 2.9 13.5kΩ 3.0 8.5kΩ Vo2 Bus Series Pt # PT6938/39 PT6935/37 PT6936 Adj. Resistor (R1)/R2 (R1)/R2 (R1)/R2 Vo(nom) 1.2V 1.8V 2.5V Va(req’d) Table 2 ADJUSTMENT RESISTOR VALUES PT6935 Series Not Recommended For New Designs

www.ti.com 11-Apr-2013 Addendum-Page 1 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Drawing Pins Package Qty Eco Plan (2) Lead/Ball Finish MSL Peak Temp (3) Op Temp (°C) Top-Side Markings (4) Samples PT6936A LIFEBUY SIP MODULE ELG 23 10 Pb-Free (RoHS) Call TI N / A for Pkg Type -40 to 85 PT6936C LIFEBUY SIP MODULE ELH 23 10 Pb-Free (RoHS) Call TI Level-3-215C-168HRS -40 to 85 PT6936N LIFEBUY SIP MODULE ELF 23 10 Pb-Free (RoHS) Call TI N / A for Pkg Type -40 to 85 PT6937A LIFEBUY SIP MODULE ELG 23 10 Pb-Free (RoHS) Call TI N / A for Pkg Type -40 to 85 PT6937C LIFEBUY SIP MODULE ELH 23 10 Pb-Free (RoHS) Call TI Level-3-215C-168HRS -40 to 85 PT6938C LIFEBUY SIP MODULE ELH 23 10 Pb-Free (RoHS) Call TI Level-3-215C-168HRS PT6938N LIFEBUY SIP MODULE ELF 23 10 Pb-Free (RoHS) Call TI N / A for Pkg Type PT6939A LIFEBUY SIP MODULE ELG 23 10 Pb-Free (RoHS) Call TI N / A for Pkg Type (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.

www.ti.com 11-Apr-2013 Addendum-Page 2 (4) Multiple Top-Side Markings will be inside parentheses. Only one Top-Side Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation of the previous line and the two combined represent the entire Top-Side Marking for that device. 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.

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