R1286K004A-TR

R1286K SERIES 2ch. PWM Step-up / Inverting DC/DC Converter with Synchronous Rectifier for AMOLED / LCD NO.EA-283-191114 OUTLINE The R1286K 2ch DC/DC converter is designed for AMOLED display power source. It contains a step up DC/DC converter and an inverting DC/DC converter. Step up DC/DC converter generates boosted output voltage to 4.6 V to 5.8 V (Selectable). Inverting DC/DC converter generates negative voltage down to -2.0 V to -6.0 V (Selectable) that is dynamically adjustable with single wire interface signal. R1286K consist of a voltage reference, error amplifiers, an oscillator, PWM control circuits, over current protection circuits, short protection circuits, an under voltage lockout circuit (UVLO), thermal shutdown circuit, a NMOS driver and a synchronous PMOS switch for boost converter, a PMOS driver and a synchronous NMOS switch for inverting converter, and so on. High efficiency boost and inverting DC/DC converters can be composed with two external inductors and three capacitors. FEATURES  Operating Voltage ········································ 2.3 V to 5.5 V [Step-up DC/DC Converter (CH1)]  Selectable Output Voltage (VOUTP) ···················· R1286KxxxX(1): 4.6 V to 5.8 V (0.1V Step)  Externally Adjustable Output Voltage ················ R1286K001B: 4.6 V to 5.8 V  Maximum Output Current ······························· R1286K0xxX(1) / R1286K001B: 250 mA R1286K1xxX (1): 300 mA  VOUTP Voltage Load Regulation ··························· Typ.± 5 mV  VOUTP Voltage Line Transient Response ·········· Typ. ± 10 mV [Inverting DC/DC Converter (CH2)]  Dynamically Adjustable Output Voltage (VOUTN) ··· -2.0 V to -6.0 V (Fixed Rate: 3.0 V, 0.1 V Step)  Selectable Single Wire (S-Wire) I/F ················· R1286KxxxX(1): Default value (0.1 V Step)  Externally Adjustable Output Voltage ················ R1286K001B: -2.0 V to -6.0 V  Maximum Output Current ······························· R1286K0xxX(1) / R1286K001B: 250 mA R1286K1xxX (1): 300 mA  VOUTN Voltage Load Regulation ·························· Typ.± 5 mV  VOUTN Voltage Line Transient Response ········· Typ. ± 10 mV [Controller]  Internal Start-up Sequence Control with Soft-start Operation  Auto Discharge Operation for Both Outputs  Short circuit protection  Internal timer-latch protection ............................... Typ. 16 ms or 40 ms  Maximum duty cycle ............................................. Typ. 85% (CH1) / Typ. 90% (CH2) (1) X : A to N (Provided except B and I) 1 R1286K NO.EA-283-191114      LX peak current limit ····································· R1286K0xxX(1)：Typ. 1.0 A (CH1), 1.5 A (CH2) R1286K1xxX(1)：Typ. 1.1 A (CH1)、1.8 A (CH2) UVLO(Under voltage lock out) protection ............. Typ. 2.05 V Thermal Shutdown ................................................ Typ. 150°C Operating Frequency ............................................ 1750kHz Package ................................................................ DFN(PLP)2730-12 APPLICATION   2 Fixed voltage power supply for portable equipment Fixed voltage power supply for AMOLED, LCD R1286K NO.EA-283-191114 SELECTION GUIDE The inverting output voltage (VOUTN), the positive output voltage (VOUTP) and the versions of the inverting output voltage are user-selectable options. Product Name Package Quantity per Reel Pb Free Halogen Free R1286K$xx∗-TR DFN(PLP)2730-12 5,000pcs Yes Yes $: Specify the delay time for timer latch (1). (0) Typ.16msec (1) Typ.40msec xx: Specify the set output voltages (VSET) for default value of VOUTx and VONDEF(2) ∗ : Specify setting methods for VOUTN and VOUTP. VONDEF：VOUTN default value(3) (Internal fixed value at shipping) VONMIN：VOUTN minimum value with S-Wire VONMAX：VOUTN maximum value with S-Wire tTRA：Variable time per 0.1V with S-Wire (4) ∗ A B C D E F G H J K L M N (1) (2) (3) (4) (5) Designation for Settings of VOUTx VOUTP / VOUTN Fixed Output Voltage type( 5) VOUTP / VOUTN Adjustable Output Voltage type VOUTP / VOUTN Fixed Output Voltage type VONDEF -5.4 V to -2.4 V -5.0 V to -2.4 V -5.2 V to -2.4 V -5.6 V to -2.6 V -5.8 V to -2.8 V -6.0 V to -3.0 V -5.0 V to -2.4 V -5.4 V to -2.4 V -5.6 V to -2.6 V -5.8 V to -2.8 V -6.0 V to -3.0 V -5.2 V to -2.4 V VONMIN -5.4 V -5.0 V -5.2 V -5.6 V -5.8 V -6.0 V -5.0 V -5.4 V -5.6 V -5.8 V -6.0 V -5.2 V VONMAX -2.4 V -2.0 V -2.2 V -2.6 V -2.8 V -3.0 V -2.0 V -2.4 V -2.6 V -2.8 V -3.0 V -2.2 V tTRA 10 ms 10 ms 10 ms 10 ms 10 ms 10 ms 360 µs 360 µs 360 µs 360 µs 360 µs 360 µs Fixed Output Voltage type only can select the delay time of 40 msec (Typ). Refer to Voltage Combination List for details. Selectable in 0.1V step Refer to the TIMING CHART of S-Wire for details. Dynamically adjustable output voltage with S-Wire 3 R1286K NO.EA-283-191114 Output voltage combination list VSET codes (xx) 4 VOUTP VONDEF 01 Setting by external resistor Setting by external resistor 02 4.6 V -4.9 V 03 5.8 V -6.0 V 04 4.8 V -4.9 V 05 5.4 V -5.4 V 06 5.0 V -5.0 V 07 5.0 V -3.5 V 08 5.6 V -5.6 V 09 5.8 V -5.8 V 10 5.5 V -5.5 V 11 4.6 V -4.4 V R1286K NO.EA-283-191114 BLOCK DIAGRAMS R1286KxxxX(1) (Fixed Output Voltage Type) PVCC Current Sense Current Sense Maxduty Limit Limit PGND PWM Control PWM Control Timer LXN LXP Short Protect Discharge Control VOUTN Q Q R S S R VOUTNS Discharge Control VOUTP VOUTPS Osc Slope ∑ CE ∑ Soft Start2 Current sense Vref2 Sequence Control S-Wire Control Current sense Soft Start1 Vref1 UVLO TST VCC GND R1286KxxxX Block Diagram (1) X : A to N (Provided, except “B” and “I”) 5 R1286K NO.EA-283-191114 R1286K001B (Adjustable Output Voltage Type) PVCC Current Sense Current Sense Maxduty Limit Limit PGND PWM Control PWM Control Timer LXN LXP Short Protect Discharge Control VOUTN Q Q R S S R VFBN Slope CE Soft Start2 Current sense Vref2 Sequence Control Enable Control ∑ Current sense Soft Start1 Vref1 UVLO VCC GND R1286K001B Block Diagram 6 VOUTP VFBP Osc ∑ VREF Discharge Control R1286K NO.EA-283-191114 PIN DESCRIPTION Top View 12 11 10 9 8 Bottom View 7 7 8 9 10 11 12 ∗ 1 2 3 4 5 6 6 5 4 3 2 1 R1286K (DFN(PLP)2730-12) Pin Configuration R1286K Pin Description Symbol Pin No. R1286KxxxX( 1) R1286K001B Description 1 VOUTNS VFBN Feed Back Pin for Inverting DC/DC 2 VOUTN VOUTN 3 LXN LXN 4 PVCC PVCC 5 VCC VCC Analog Power Input Pin 6 GND GND Analog GND Pin 7 PGND PGND Power GND Pin 8 LXP LXP 9 VOUTP VOUTP 10 VOUTPS VFBP 11 CE CE 12 TST VREF Outout Pin for Inverting DC/DC Switching Pin for Inverting DC/DC Power Input Pin Switching Pin for Step up DC/DC Output Pin for Step up DC/DC Feed Back Pin for Step up DC/DC Chip Enable and S-Wire Control Input Pin (R1286KxxxX) Chip Enable Pin (R1286KxxxB) TEST Pin (2) (R1286KxxxX) Reference Voltage Output Pin for Inverting DC/DC (R1286KxxxB) ∗ The tab on the bottom of the package is substrate level (GND). It is recommended that the tab be connected to the ground plane on the board. (1) X : A to N (Provided, except “B” and “I”) (2) TEST pin must be connected to the GND or leaving it open. 7 R1286K NO.EA-283-191114 ABSOLUTE MAXIMUM RATINGS Symbol Parameter (GND = PGND = 0 V) Rating Unit VCC VCC / PVCC Pin Voltage -0.3 to 6.0 V VCE CE Pin Voltage -0.3 to 6.0 V VLXP LXP Pin Voltage -0.3 to 6.5 V VOUTP Pin Voltage -0.3 to 6.5 V VCC - 14 to VCC + 0.3 V VCC - 14 to 0.3 V VOUTP(S) VLXN VOUTN(S) LXN Pin Voltage VOUTN Pin Voltage VTST TST Pin Voltage [R1286kxxxx(1)] -0.3 to 6.0 V VFBP VFBP Pin Voltage [R1286K001B] -0.3 to 6.0 V VFBN VFBN Pin Voltage [R1286K001B] -0.3 to VCC + 0.3 V VREF VREF Pin Voltage [R1286K001B] -0.3 to VCC + 0.3 V 3100 mW PD Power Dissipation (2) (DFN(PLP)2730-12, JEDEC STD. 51-7) Tj Junction Temperature Range −40 to 125 °C Tstg Storage Temperature Range -55 to 125 ºC ABSOLUTE MAXIMUM RATINGS Electronic and mechanical stress momentarily exceeded absolute maximum ratings may cause the permanent damages and may degrade the lifetime and safety for both device and system using the device in the field. The functional operation at or over these absolute maximum ratings is not assured. RECOMMENDED OPERATING CONDITIONS Symbol Parameter Rating Unit VCC Operating Input Voltage 2.3 to 5.5 V Ta Operating Temperature Range −40 to 85 °C RECOMMENDED OPERATING CONDITIONS All of electronic equipment should be designed that the mounted semiconductor devices operate within the recommended operating conditions. The semiconductor devices cannot operate normally over the recommended operating conditions, even if when they are used over such conditions by momentary electronic noise or surge. And the semiconductor devices may receive serious damage when they continue to operate over the recommended operating conditions. (1) (2) 8 X : A to N (Provided, except “B” and “I”) Refer to POWER DISSIPATION for detailed information. R1286K NO.EA-283-191114 ELECTRICAL CHARACTERISTICS The specifications surrounded by are guaranteed by Design Engineering at - 40ºC ≤ Ta ≤ 85ºC. R1286K Electrical Characteristics (Ta = 25ºC) Symbol Parameter Conditions Min. ICC VCC Consumption Current (at no switching) VCC=5.5V 1.2 ISTANDBY Standby Current VCC=VLXP=5.5V , VCE=VLXN=0V 0.1 5 µA VUVLO1 UVLO Detection Voltage Falling 2.05 2.15 V VUVLO2 UVLO Release Voltage Rising VUVLO1 +0.10 2.28 V fOSC Oscillator Frequency VCC=3.7V 1500 1750 2000 kHz VCEH CE Pin Input Voltage, high VCC=5.5V 1.2 VCEL CE Pin Input Voltage, low VCC=2.3V RCE CE Pin Pull-down Resistance VCC=3.7V 160 kΩ TTSD Thermal Shutdown Detection Temperature VIN=3.7V 150 °C TTSR Thermal Shutdown Release Temperature VIN=3.7V 125 °C 1.95 Typ. Max. Unit mA V 0.4 V [ R1286K0xxx] tDLY Delay Time for Protection VCC=3.7V 8 16 24 ms VCC=3.7V 32 40 48 ms [ R1286K1xxX( 1)] tDLY Delay Time for Protection ■ Set-up DC/DC Converter (CH1) Maxduty1 Maximum Duty Cycle 1 VCC=3.7V 85 % VOUTP Discharge Current VCC=3.7V, VOUTP=0.1V 1.1 mA tSSP CH1 Soft-start Time VCC=3.7V RLXP LXP Pin On-resistance VCC=3.7V 400 mΩ Synchronous SW Pch.Onresistance VCC=3.7V 700 mΩ VCC=3.7V 1.0 A VCC=3.7V 1.1 A IVOUTP RSYNCP 1.6 2.4 3.0 ms [ R1286K0xxx] ILIMLXP LXP Pin Limit Current [ R1286K1xxX] ILIMLXP LXP Pin Limit Current [ R1286KxxxX] VOUTP (1) VOUTP Voltage Tolerance VCC=3.7V ×0.991 VSET ×1.009 V X : A to N (Provided, except “B” and “I”) 9 R1286K NO.EA-283-191114 The specifications surrounded by are guaranteed by Design Engineering at - 40ºC ≤ Ta ≤ 85ºC. R1286K Electrical Characteristics (Continued) Symbol Parameter (Ta = 25ºC) Conditions Min. Typ. Max. Unit 0.985 1.000 1.015 V 0.1 µA [ R1286K001B] VFBP VFBP Voltage Tolerance VCC=3.7V IFBP VFBP Input Current VCC=5.5V, VFBP=0V or 5.5V -0.1 ■ Inverting DC/DC Converter (CH2) Maxduty2 Maximum Duty Cycle 2 VCC=3.7V 90 % IVOUTN VOUTN Discharge Current VCC=3.7V, VOUTN=-0.1 0.3 mA RLXN LXN Pin On-resistance VCC=3.7V 400 mΩ Synchronous SW Nch.Onresistance VCC=3.7V 600 mΩ VCC=3.7V 1.5 A VCC=3.7V 1.8 A RSYNCN [ R1286K0xxx] ILIMLXN LXN Pin Limit Current [ R1286K1xxX] ILIMLXN LXN Pin Limit Current [ R1286KxxxX] VONDEF VOUTN Default Voltage Tolerance VCC=3.7V, selectable between VONMIN and VONMAX at shipping VSET -70 VSET VSET +70 mV VONMIN VOUTN Minimum Voltage Tolerance VCC=3.7V, selectable between -2.0V and -3.0V at shipping VSET -70 VSET VSET +70 mV VONMAX VOUTN Maximum Voltage Tolerance VCC=3.7V VSET -70 VONMIN + 3.0V VSET +70 mV VOUTN VOUTN Voltage Tolerance (S-Wire) VCC=3.7V (Guaranteed by design engineering) VSET -80 VSET VSET +80 mV tSSN Soft-start Time for CH2 VCC=3.7V 1.6x VONDEF/ -4.9 2.3x VONDEF/ -4.9 3.0x VONDEF/ -4.9 ms [ R1286K001B] VFBN VFBN Voltage Tolerance VCC=3.7V -25 0 25 mV VREF VREF Voltage Tolerance VCC=3.7V 1.18 +VFBN 1.2 +VFBN 1.22 +VFBN V IFBN VFBN Input Current VCC=5.5V, VFBN = 0V or 5.5V -0.1 0.1 µA tSSN Soft-start Time for CH2 VCC=3.7V 1.6 3.6 ms 2.8 All test items listed under Electrical Characteristics are done under the pulse load condition (Tj≈Ta=25ºC). 10 R1286K NO.EA-283-191114 THEORY OF OPERATION Start-up Sequence When CE level turns from ‘L’ to ‘H’ level, the softstart of CH1 starts the operation. After detecting output voltage of CH1(VOUTP)as the nominal level, the soft start of CH2 starts the operation. CE CH1 (VOUTP) 0V Soft start CH1 Soft Start CH2 CH2 (VOUTN) Auto Discharge Function When CE level turns from ‘H’ to ‘L’ level, the R1286K goes into standby mode and switching of the outputs of LXP and LXN will stop. Then dischage switsh between VOUTN and GND and switch between VOUTP and GND turn on and discharge the negative output voltage and positive output voltage. The positive and negative output voltage is discharged to 0V in standby mode. If Vcc voltage became lower than UVLO detect voltage , discharge switches also turn on and discharge output voltage(VOUTN and VOUTP) . In case of timer latch protection,discharge switches will keep off . CE VOUTP 0V VOUTN Discharge Thermal Shutdown Protection If the over temparature is detected, internal Mosfet will turn-off soon. And when the temparature get lower than the release temparature, IC is reset and restart the operation. 11 R1286K NO.EA-283-191114 Overcurrent Protection and Short-circuit Protection Circuit Timer The over current protection circuit supervises the peak current of the inductor (The current passing through NMOS transistor of CH1 and PMOS transistor of CH2) with respect to each switching cycle. If the peak current exceeds the LX current limit (ILIMLXP or ILIMLXN), the over current protection circuit turns off the NMOS transistor of CH1 or PMOS transistor of CH2. If the over current continues more than the protection delay time (TDLY), the short current protection circuit latches the built-in driver at OFF state and stops the operation of DC/DC converter. ∗ LX limit current (ILIMLXP or ILIMLXN) and the protection delay time (TDLY) can be easily affected by self-heating and ambient environment. The drastic drop of output voltage or the unstable output voltage caused by the short-circuiting may affect the protection operation and the delay time. To release the latch over current protection, reset the IC by inputting “L” into CE pin or by making the input voltage lower than the UVLO detector threshold (VUVL01). During the softstart operation of CH1 and CH2, the timer operates until detecting output voltage of CH2 (VOUTN) as the nominal level. Therefore, even if the softstart cannot finish correctly because of the short circuit, the protection timer function will be able to work correctly. Sequence with S-Wire Control for VOUTN (R1286KxxxX(1)) Adjusted Value Adjusted Value Setting Command Setting Command S-Wire Input to CE pin VOUTP Output Voltage VOUTN tSS Shutdown tstop ttra Default Value tstop ttra Adjusted Value toff_dly Adjusted Value ■ Default Value Driving VOUTP rises up first and secondarily VOUTN goes down. In this time VOUTN is set VONDEF. Soft-start time (tSS) =2.4ms + 2.3 x VONDEF/ -4.9 (Typ.) (1) X : A to N (Provided, except “B” and “I”) 12 tvo_off Shutdown R1286K NO.EA-283-191114 ■ Adjusted Value Driving After receiving the adjusted value setting command, VOUTN is changed to the target voltage in multiple steps method. Adjusted value is also selectable with pulse count (Please refer to VOUTN VARIABLE TABLE). In the case of R1286KxxxA/C/D/E/F/G, VOUTN change 0.01V step in every 1ms and it takes 10ms per 0.1V that is minimum step for VOUTN setting value. In the case of R1286KxxxH/J/K/L/M/N, VOUTN change 0.01V step in every 36us and it takes 360us per 0.1V that is minimum step for VOUTN setting value. [Multiple steps method (In case of ΔVOUT = 0.1V)] Adjusted Value Setting Command S-Wire VOUTN 0.01V tSTOP 0.1V 1ms or 36µs ttra ・Multiple step rate : 0.01V / 1ms or 36µs ・Transient time (ttra) for minimum ΔVOUTN : 10 ms or 0.36 ms 13 R1286K NO.EA-283-191114 VOUTN Variable Table The adjusted value setting command are operated with S-Wire input (pulse count) as the following table. VOUTN Variable Table (31 steps) BIT R1286KxxxA R1286KxxxG 0 (Default) -2.4 to -5.4 -3.0 to -6.0 1 -5.4 -6.0 2 -5.3 -5.9 3 -5.2 -5.8 4 -5.1 -5.7 5 -5.0 -5.6 6 -4.9 -5.5 7 -4.8 -5.4 8 -4.7 -5.3 9 -4.6 -5.2 10 -4.5 -5.1 11 -4.4 -5.0 12 -4.3 -4.9 13 -4.2 -4.8 14 -4.1 -4.7 15 -4.0 -4.6 16 -3.9 -4.5 17 -3.8 -4.4 18 -3.7 -4.3 19 -3.6 -4.2 20 -3.5 -4.1 21 -3.4 -4.0 22 -3.3 -3.9 23 -3.2 -3.8 24 -3.1 -3.7 25 -3.0 -3.6 26 -2.9 -3.5 27 -2.8 -3.4 28 -2.7 -3.3 29 -2.6 -3.2 30 -2.5 -3.1 31 -2.4 -3.0 (Pulse Count) 14 R1286K NO.EA-283-191114 Timing Chart for Commands with S-Wire VIH VIL ton Timing specification Item Symbol toff tstop Min. Typ. 70 tssp + tssn 10 (R1286KxxxA/C/D/E/F/G) 0.36 (R1286KxxxH/J/K/L/M/N) 90 Soft-start time tss VOUTN Transient time (1 step) ttra Turn-off delay time toff_dly VOUT discharge time tvo_off CE pin input voltage, high VIH CE pin input voltage, low VIL S-Wire time, high ton 2 S-Wire time, low toff S-Wire command stop time tstop Max. Unit ms ms 110 2.0 1.2 µs ms V 0.4 V 10 20 µs 2 10 20 µs 70 90 110 µs 15 R1286K NO.EA-283-191114 Operation of Set-up DC/DC Converter (CH1) and Output Current IL2 Inductor VIN Pch Tr IOUT VOUT IL1 Nch Tr CL Basic Circuit ILxmax IL IL ILxmax ILxmin ILxmin Tf t ton toff T=1/fosc Discontinuous Inductor Current Mode t ton T=1/fosc toff Continuous Inductor Current Mode Inductor Current Waveforms (IL) through Indictor (L) The PWM control type of CH1 has two operation modes characterized by the continuity of inductor current: discontinuous inductor current mode and continuous inductor current mode. When a NMOS Tr. is in On-state, the voltage to be applied to the inductor (L) is described as VIN. An increase in the inductor current (IL1) can be written as follows: IL1 = VIN x ton / L ·········································································································· Equation 1 In the CH1 circuit, the energy accumulated during the On-state is transferred into the capacitor even in the Offstate. A decrease in the inductor current (IL2) can be written as follows: IL2 = (VOUT − VIN) x tf / L ································································································· Equation 2 16 R1286K NO.EA-283-191114 In the PWM control, IL1 and IL2 become continuous when tf = toff, which is called continuous inductor current mode. When the device is in continuous inductor current mode and operates in steady-state conditions, the variations of IL1 and IL2 are same: VIN x ton / L = (VOUT − VIN) x toff / L ··················································································· Equation 3 Therefore, the duty cycle in continuous inductor current mode is: Duty = ton / (ton + toff) = (VOUT − VIN) / VOUT ········································································ Equation 4 If the input voltage (VIN) is equal to VOUT, the output current (IOUT) is: IOUT = VIN2 x ton / (2 x L x VOUT) ························································································ Equation 5 If IOUT is larger than Equation 5, the device switches to continuous inductor current mode. The LX peak current flowing through L (ILxmax) is: ILxmax = IOUT x VOUT / VIN + VIN x ton / (2 x L) ······································································ Equation 6 ILxmax = IOUT x VOUT / VIN + VIN x T x (VOUT − VIN) / (2 x L x VOUT) ············································· Equation 7 The LX peak current limit circuit operates in both modes if the ILxmax becomes more than the LX peak current limit. When considering the input and output conditions or selecting the external components, please pay attention to ILxmax. Notes: The above calculations are based on the ideal operation of the device. They do not include the losses caused by the external components or LX switch. The actual maximum output current will be 70% to 90% of the above calculation results. Especially, if IL is large or VIN is low, it may cause the switching losses. 17 R1286K NO.EA-283-191114 Operation of Inverting DC/DC Converter (CH2) and Output Current Pch Tr Nch Tr IOUT VOUT VIN IL1 IL2 CL Inductor Basic Circuit Discontinuous Inductor Current Mode Continuous Inductor Current Mode ILxmax IL IL ILxmax ILxmin ILxmin tf t ton toff T=1/fosc t ton toff T=1/fosc Inductor Current Waveforms (IL) through Indictor (L) The PWM control type of CH2 has two operation modes characterized by the continuity of inductor current: discontinuous inductor current mode and continuous inductor current mode. When a PMOS Tr. is in ON-state, the voltage to be applied to the inductor (L) is described as V . An increase IN in the inductor current (IL1) can be written as follows: IL1 = VIN x ton / L ·········································································································· Equation 8 In the CH2 circuit, the energy accumulated during the On-state is transferred into the capacitor even in the Offstate. A decrease in the inductor current (IL2) can be written as follows: IL2 = |VOUT| x tf / L ········································································································· Equation 9 18 R1286K NO.EA-283-191114 In the PWM control type, when tf = toff, the inductor current will be continuous and the operation of CH2 will be continuous inductor current mode. When the device is in continuous inductor current mode and operates in steady-state conditions, the variation of IL1 and IL2 are same: VIN x ton / L = |VOUT| x toff / L ························································································· Equation 10 Therefore, the duty cycle in continuous inductor current mode is: Duty = ton / (ton + toff) = |VOUT| / (|VOUT| + VIN) ··································································· Equation 11 If the input voltage (VIN) equal to VOUT, the output current (IOUT) is: IOUT = VIN2 x ton / (2 x L x |VOUT|) ····················································································· Equation 12 If IOUT is larger than Equation 12, the device switches to continuous inductor current mode. The LX peak current flowing through L (ILxmax) is: ILxmax = IOUT x (|VOUT| + VIN) / VIN + VIN x ton / (2 x L) ························································· Equation 13 ILxmax = IOUT x (|VOUT| + VIN) / VIN + VIN x |VOUT| x T / { 2 x L x (|VOUT| + VIN) } ··························· Equation 14 The LX peak current limit circuit operates in both modes if the ILxmax becomes more than the LX peak current limit. When considering the input and output conditions or selecting the external components, please pay attention to ILxmax. Notes: The above calculations are based on the ideal operation of the device. They do not include the losses caused by the external components or LX switch. The actual maximum output current will be 70% to 90% of the above calculation results. Especially, if IL is large or VIN is low, it may cause the switching losses. 19 R1286K NO.EA-283-191114 APPLICATION INFORMATION Typical Application Circuits VOUTN VOUTNS C2 VOUTN TST EN Control S-Wire Control CE L2 LXN VOUTPS VOUTP PVCC VOUTP L1 C1 VCC LXP GND PGND C3 R1286KxxxX (Fixed Output Voltage Type) Typical Application Circuit C4 R4 VOUTN R5 VFB C2 L2 VOUTN LXN PVCC C1 EN Control VREF CE R1 VFBP VOUTP VCC LXP GND PGND C5 R3 R2 L1 VOUTP C3 R1286K001B (Adjustable Output Voltage Type) Typical application Circuit Recommended External Components Symbol Description L1 VLF302510M-4R7M (TDK)、VLF3010S-4R7M (TDK) L2 VLF4012S-4R7M (TDK)、NR4012T4R7M (TAIYOYUDEN) C1(CIN), C2(COUTN), C3(COUTP) 4.7µF、 2012size X5R T=0.85max C4 (CREF)(1) 0.1µF、 0603size (1) R1286K001B Only 20 R1286K NO.EA-283-191114 Precautions for Selecting External Components  Place a ceramic capacitor of 4.7µF or more (C1) between VCC pin/PVCC pin and GND pin/ PGND pin.  Place a ceramic capacitor of 4.7µF or more (C2, C3) between VOUTP pin / VOUTN pin and GND.  Place a ceramic capacitor of 0.1µF to 2.2µF (C4) between VREF pin and GND. [ R1286K001B ]  Step-up DC/DC Converter Output Voltage Setting [ R1286K001B ] The output voltage VOUTP of the step-up DC/DC converter is controlled with maintaining the VFBP as 1.0V. VOUTP can be set with adjusting the values of R1 and R2 as in the next formula. VOUTP = VFBP × (R1 + R2) / R1 VOUTP can be set from 4.6V to 5.8V. The appropriate value range of R1 is from 20kΩ to 60k Ω.  Inverting DC/DC Converter Output Voltage Setting [ R1286K001B ] The output voltage VOUTN of the inverting DC/DC converter is controlled with maintaining the VFBN as 0V. VOUTN can be set with adjusting the values of R1 and R2 as in the next formula. VOUTN = VFBN - (VREF - VFBN) × R5 / R4 VOUTN can be set from -2.0V to -6.0V. The appropriate value range of R4 is from 2.5kΩ to 60kΩ.  Phase Compensation of Step-up DC/DC Converter [ R1286K001B ] DC/DC converter’s phase may lose 180 degree by external components of L and C and load current. Because of this, the phase margin of the system will be less and the stability will be worse. Therefore, the phase must be gained. Zero will be formed with R1 and C5. C5 [pF] = 300 / R1 [kΩ] If the noise of the system is large, the output noise affects the feedback and the operation may be unstable. In that case, another resistor R3 will be set. The appropriate value range is from 10Ω to 1kΩ. 21 R1286K NO.EA-283-191114 TECHNICAL NOTES The performance of a power source circuit using this device is highly dependent on a peripheral circuit. A peripheral component or the device mounted on PCB should not exceed a rated voltage, a rated current or a rated power. When designing a peripheral circuit, please be fully aware of the following points.       Wire the bypass capacitor (C1) between the VCC pin, the GND pin, or the PVCC pin as short as possible. The GND pin should be connected to the GND plane of the PCB. Wire the GND of the output capacitors (C2, C3) to the GND pin of the device as short as possible. The wiring among each GND line of C1, C2, and C3 and the GND pin of the device must be short as possible via the device. The wiring between LXP pin, LXN pin and inductor each should be as short as possible and mount output capacitors (C2 and C3) as close as possible to the VOUTP, VOUTN each. Input impedance of VOUTPS pin, VOUTNS pin, VFBP pin, and VFBN pin is high, therefore, the external noise may affect the performance. The coupling capacitance between these nodes and switching lines must be as short as possible. As shown in the diagrams of the current paths of boost DC/DC converter and the current path of inverting DC/DC converter, the parasitic impedance, inductance, and the capacitance in the parts pointed with red arrows have an influence against the stability of the DC/DC converters and become a cause of the noise. Therefore, such parasitic elements must be made as small as possible. Wiring of the current paths must be short and thick. 【Set-up DCDC】 NMOSFET-ON PMOSFET-ON 【Inverting DCDC】 PMOSFET-ON 22 NMOSFET-ON R1286K NO.EA-283-191114 PCB Layout R1286K Board Layout [PKG: DNF (PLP) 2730-12] Top Layer Back Layer R1286KxxxX( 1)（Fixed Output Voltage Type）Board Layout Top Layer Back Layer R1286K001B (Adjustable Output Voltage Type) Board Layout (1) X : A to N (Provided, except “B” and “I”) 23 R1286K NO.EA-283-191114 TYPICAL CHARACTERISTICS Typical Characteristics are intended to be used as reference data, they are not guaranteed. 1) Output Voltage vs. Output Current R1286KxxxX(1) (VOUTP = 4.6 V) R1286KxxxX (VOUTP = 5.4 V) (Ta = 25°C) 4.7 5.5 4.68 5.48 4.66 5.46 4.64 5.44 4.62 5.42 VOUT P[V] VOUT P[V] (Ta = 25°C) 4.6 4.58 4.56 Vin= 4.8 V Vin= 3.7 V Vin= 2.9 V 4.54 4.52 5.4 5.38 5.36 Vin= 4.8 V Vin= 3.7 V Vin= 2.9 V 5.34 5.32 5.3 4.5 0 0 25 50 75 100 125 150 175 200 225 250 275 300 25 50 75 100 125 150 175 200 225 250 275 300 IOUT P [mA] IOUT P [mA] R1286KxxxX (VOUTP = 5.8 V) R1286KxxxX (VOUTN = -4.9 V) (Ta = 25°C) 5.9 -4.8 5.88 -4.82 5.86 -4.84 5.84 -4.86 5.82 -4.88 VOUT N[V] VOUT P[V] (Ta = 25°C) 5.8 5.78 -4.9 -4.92 5.76 Vin= 4.8 V Vin= 3.7 V Vin= 2.9 V 5.74 5.72 -4.94 -4.98 5.7 0 -5 25 50 75 100 125 150 175 200 225 250 275 300 0 IOUT P [mA] R1286KxxxX (VOUTN = -5.4 V) Vin= 4.8 V Vin= 3.7 V Vin= 2.9 V -4.96 25 50 75 100 125 150 175 200 225 250 275 300 IOUT N [mA] R1286KxxxX (VOUTN = -6.0 V) -5.32 -5.92 -5.34 -5.94 -5.36 -5.96 -5.38 -5.98 -5.4 -5.42 -5.44 Vin= 4.8 V Vin= 3.7 V Vin= 2.9 V -5.48 -5.5 0 25 50 75 100 125 150 175 200 225 250 275 300 IOUT N [mA] 24 -6 -6.02 -5.46 (1)X (Ta = 25°C) -5.9 VOUT N[V] VOUT N[V] (Ta = 25°C) -5.3 : A to N (Provided, except “B” and “I”) -6.04 Vin= 4.8 V Vin= 3.7 V Vin= 2.9 V -6.06 -6.08 -6.1 0 25 50 75 100 125 150 175 200 225 250 275 300 IOUT N [mA] R1286K NO.EA-283-191114 2) Efficiency vs. Output Current R1286KxxxX (VOUTP = 4.6 V, VOUTN = -4.9 V) R1286KxxxX (VOUTP = 5.4 V, VOUTN = -5.4 V) (Ta = 25°C) (Ta = 25°C) 100 90 90 80 80 70 Efficiency[%] Efficiency[%] 100 60 50 40 Vin= 4.2 V Vin= 3.7 V Vin= 2.9 V 30 20 0 25 50 75 100 125 150 175 200 225 250 275 300 IOUT = IOUTP = IOUT N[mA] 70 60 50 40 Vin= 4.2 V Vin= 3.7 V Vin= 2.9 V 30 20 0 25 50 75 100 125 150 175 200 225 250 275 300 IOUT = IOUTP = IOUT N[mA] R1286KxxxX (VOUTP = 5.8 V, VOUTN = -6.0 V) (Ta = 25°C) 100 90 Efficiency[%] 80 70 60 50 Vin= 4.2 V Vin= 3.7 V Vin= 2.9 V 40 30 20 0 25 50 75 100 125 150 175 200 225 250 275 300 IOUT = IOUTP = IOUT N[mA] 25 R1286K NO.EA-283-191114 3) Turn-on/Turn-off Waveform by CE R1286Kx02A (VIN=3.7 V, IOUTP = IOUTN = 0 mA ) (Ta = 25°C) CH1=CE CH2=VOUTP CH3=VOUTN CH4=IIN CH1=CE CH2=VOUTP CH3=VOUTN CH4=IIN R1286Kx05A (VIN=3.7 V, IOUTP = IOUTN = 0 mA, COUTP = COUTN = 4.7µF) (Ta = 25°C) CH1=CE CH1=CE CH2=VOUTN CH2=VOUTN CH3=VOUTP CH3=VOUTP CH4=IIN CH4=IIN R1286Kx05A (VIN=3.7 V, IOUTP = IOUTN = 0 mA, COUTP = 10 µF x 2, COUTN = 4.7µF) (Ta = 25°C) 26 CH1=CE CH1=CE CH2=VOUTN CH2=VOUTN CH3=VOUTP CH3=VOUTP CH4=IIN CH4=IIN R1286K NO.EA-283-191114 4) VOUTN Waveform with S-Wire Control R1286Kx02A (-4.9 V ≤ VOUTN ≤ -2.4 V, IOUTP = IOUTN = 0 mA ) R1286Kx02A (-2.4 V ≤ VOUTN ≤ -4.9 V, IOUTP = IOUTN = 0 mA ) (Ta = 25°C) (Ta = 25°C) puls pulse CH1=CE CH1=CE CH2=VOUTN CH2=VOUTN CH4=IIN CH4=IIN 5) Load Transient Response R1286KxxxX (VOUTP = 4.6 V) R1286KxxxX (VOUTN = -4.9 V) (Ta = 25°C) CH3=VOUTP CH4=IOUT 6) Line Transient Response R1286KxxxX (VOUTP = 4.6 V, IOUTP = 100 mA) (Ta = 25°C) (Ta = 25°C) CH3=VOUTN CH4=IOUT R1286KxxxX (VOUTN = -4.9 V, IOUTN = 100 mA) (Ta = 25°C) CH1=VIN CH1=VIN CH3=VOUTP CH3=VOUTN 27 R1286K NO.EA-283-191114 7) UVLO Voltage vs. Temperature R1286KxxxX 8) VOUTP Voltage vs. Temperature R1286Kx02X 4.65 2.25 2.2 UVLO Release VOUTP [V] A VUVLO [V] A 4.63 2.15 2.1 2.05 UVLO 2 4.61 4.59 4.57 1.95 1.9 4.55 -40 -20 0 20 40 60 80 -40 -20 0 Ta [°C] 9) VOUTN Voltage vs. Temperature R1286KxxxC -4.9 -1.97 -4.94 60 80 40 60 80 VOUTN [V] A VOUTN [V] A -1.95 -4.98 -2.01 -5.02 -2.03 -5.06 -2.05 -5.1 -40 -20 0 20 40 60 80 R1286KxxxG -5.85 -5.9 -5.95 -6 -6.05 -6.1 -6.15 -40 -20 0 20 Ta [°C] -40 -20 0 20 Ta [°C] Ta [°C] VOUTN [V] A 40 R1286KxxxX -1.99 28 20 Ta [°C] 40 60 80 R1286K NO.EA-283-191114 10) VFBN Voltage vs. Temperature R1286K001B 11) VREF Voltage vs. Temperature R1286K001B 0.02 1.21 0.01 1.2 VREF [V] A 1.22 VFBN [V] A 0.03 0 1.19 -0.01 1.18 -0.02 1.17 -0.03 1.16 -40 -20 0 20 40 60 80 -40 -20 0 Ta [°C] 20 40 60 80 Ta [°C] 12) LXP Current Limit vs. Temperature R1286KxxxX 13) LXN Limit Current vs. Temperature R1286KxxxX 2.1 1.4 2 1.3 1.9 1.2 R1286K1xxX LIMLXN [A] A LIMLXP [A] A R1286K1xxX 1.8 1.7 1.1 1.6 R1286K0xxX 1 R1286K0xxX 1.5 1.4 0.9 -40 -20 0 20 40 60 80 Ta [°C] -40 -20 0 20 40 60 80 Ta [°C] 14) Oscillator Frequency vs. Temperature R1286KxxxX FOSC1A [kHz] A 1850 1800 1750 1700 1650 -40 -20 0 20 40 60 80 Ta [°C] 29 R1286K NO.EA-283-191114 16) Maxduty2 vs. Temperature R1286KxxxX 87 94 86 93 Maxduty2 [%] A Maxduty1 [%] A 15) Maxduty1 vs. Temperature R1286KxxxX 85 84 83 92 91 90 89 82 88 81 -40 -20 0 20 40 60 -40 80 -20 0 Ta [°C] 17) CH1 Soft-start Time vs. Temperature R1286KxxxX 40 60 80 18) CH2 Soft-start Time vs. Temperature R1286KxxxG 2.9 3.4 2.7 3.2 TSS2 [ms] A TSS1 [ms] A 20 Ta [°C] 2.5 2.3 2.1 3 2.8 2.6 1.9 2.4 -40 -20 0 20 40 60 80 -40 -20 0 Ta [°C] 20 40 60 80 Ta [°C] 19) CH2 Soft-start Time vs. Temperature R1286K001B 20) Delay Time for Protection vs. Temperature R1286KxxxX 50 3.3 45 R1286K1xxX 40 TDLY[ms] A TSS2 [ms] A 3.1 35 2.9 30 2.7 25 R1286K0xxX 20 2.5 15 2.3 10 -40 -20 0 20 Ta [°C] 30 40 60 80 -40 -20 0 20 Ta [°C] 40 60 80 POWER DISSIPATION DFN(PLP)2730-12 Ver. A The power dissipation of the package is dependent on PCB material, layout, and environmental conditions. The following measurement conditions are based on JEDEC STD. 51-7. Measurement Conditions Item Measurement Conditions Environment Mounting on Board (Wind Velocity = 0 m/s) Board Material Glass Cloth Epoxy Plastic (Four-Layer Board) Board Dimensions 76.2 mm × 114.3 mm × 0.8 mm Copper Ratio Outer Layer (First Layer): Less than 95% of 50 mm Square Inner Layers (Second and Third Layers): Approx. 100% of 50 mm Square Outer Layer (Fourth Layer): Approx. 100% of 50 mm Square Through-holes  0.3 mm × 23 pcs Measurement Result Item (Ta = 25°C, Tjmax = 125°C) Measurement Result Power Dissipation 3100 mW Thermal Resistance (ja) ja = 32°C/W Thermal Characterization Parameter (ψjt) ψjt = 8°C/W ja: Junction-to-Ambient Thermal Resistance ψjt: Junction-to-Top Thermal Characterization Parameter Power Dissipation vs. Ambient Temperature Measurement Board Pattern i PACKAGE DIMENSIONS DFN(PLP)2730-12 DM-DFN(PNP)2730-12-JE-B DFN(PLP)2730-12 Package Dimensions (Unit: mm) i 1. 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