R1287 Series
PWM/VFM, Dual-channel Step-up/Inverting DC/DC Converter with Synchronous Rectifier for LCD
Download Datasheet
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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.
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Spec
Consumer 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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Technical
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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
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Quality &
PackagesProduct Name Compatibility Package Marking Reliability R1287Zxxxx-E2-F 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.
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Sample / Buy
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Buy Online
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Buy, Request for Samples, Request for Information Materials
Authorized Distributors
Please contact your local distributors for any sales-related inquiry such as price, stock, delivery, etc.
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Download Datasheet
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 |