R1287 Series
PWM/VFM, Dual-channel Step-up/Inverting DC/DC Converter with Synchronous Rectifier for LCD
Description
The R1287 Series are CMOS-based PWM/VFM dual-channel step-up/inverting DC/DC converters with synchronous rectifier for LCD. The R1287 includes a soft-start circuit, an under-voltage lockout circuit (UVLO), a latch-type short circuit protection, and a thermal shutdown circuit. By simply using two inductors and three capacitors as external components, a high-efficiency step-up/inverting DC/DC converter can be easily configured. The R1287 provides two control types: the PWM control and the PWM/VFM auto switching control. Both CH1 and CH2 can independently control the ON/ OFF control and freely set the starting sequence and shutdown sequence. Both CH1 and CH2 own an auto-discharge function which actively discharges the output voltage to ground within a short time in shutdown mode. The R1287 is used for the application of the LCD.
Spec
| Standard | |
|---|---|
| Input Voltage Range | 2.5 V to 5.5 V (6.0 V) |
| Operating Temperature Range | -40°C to 85°C (125°C) |
| Supply Current | Typ. 470 µA |
| Standby Current | Typ. 0.1 µA |
| Output Voltage Range | Boost: 4.5 V to 5.8 V (Internally Fixed or Externally Configurable) Inverting: -4.5 V to -5.8 V (Internally Fixed) -4.5 V to -6.0 V (Externally Configurable) |
| Output Voltage Accuracy | Boost: ±0.9% / Inverting; ±1% |
| Feedback Voltage | Boost: 1.0 V / Inverting; 0 V |
| Feedback Voltage Accuracy | Boost: ±15 mV / Inverting: ±30 mV |
| Output Current | Boost , Inverting: 200 mA (B/D/F/H), 100 mA (C/G) |
| Oscillator Frequency | Boost: 900 kHz (B/F), 300 kHz (C/G), 1 MHz (D/H) Inverting: 1.1 MHz (B/F), 300 kHz (C/G), 1 MHz (D/H) |
| Maximum Duty Cycle | Boost , Inverting: Typ. 90% (B/D/F/H), Typ. 97% (C/G) |
| Package | WLCSP-12-P1, DFN3030-12 |
Protections / Functions
| TSD | ILX | OCP | OVP | UVLO | OVLO | Reverse | Shutdown | Soft Start | SSCG | PGOOD | Auto Discharge | Anti-ringing | Sequencing | Max Duty | Ext. Phase | LED Adjust |
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Functional Description
| TSD | Thermal Shutdown Function |
|---|---|
| ILX | LX Current Limit Function |
| OCP | Overcurrent Protection |
| OVP | Overvoltage Protection |
| UVLO | Undervoltage Lockout Protection |
| OVLO | Overvoltage Lockout Protection |
| Reverse | Reverse Current Protection Circuit |
| Shutdown | Shutdown Function |
| Soft Start | Soft Start Function |
| SSCG | Spread Spectrum Clock Generator Function |
| PGOOD | Power Good Output |
| Auto Discharge | Auto Discharge Function |
| Anti-ringing | Anti-ringing Switch Function |
| Sequencing | Start-up Sequencing Control |
| Max Duty | Maximum Duty Cycle |
| Ext. Phase | Externally Adjustable Phase Compensation |
| LED Adjust | LED High-speed Dimming Control |
Technical Documents
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R1287xxxxy Typical Application (Fixed Output Voltage Type)
C1(CIN),C2(COUTP),C3(COUTN): 10µF
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R1287x001B Efficiency vs. Output Current
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R1287x001C Efficiency vs. Output Current
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Related Links
Quality & Packages
| Product Name | Compatibility | Package | Marking | Reliability |
|---|---|---|---|---|
| R1287Zxxxx-E2-F |
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WLCSP-12-P1 | See datasheet | R1287Z-F |
| R1287Lxxxx-TR |
|
DFN3030-12 | See datasheet | R1287L |
- Refer to the datasheets for the details on the product.
- The package file or the datasheet includes package dimensions, taping specifications, taping reels dimensions, power dissipations, and recommended land pattern.
FAQ
Buy / Contact
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Purchase, Request for samples and documentsSales are made through distributors. Please contact your local distributors for any sales-related inquiry such as price.
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Available from 1 piece!Our electronic device products are available through our authorized online distributors.
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Technical Support