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R1287 Series
PWM/VFM, Dual-channel Step-up/Inverting DC/DC Converter with Synchronous Rectifier for LCD
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.
Specs & Datasheets
| 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 Documents
R1287xxxxy Typical Application (Fixed Output Voltage Type)
C1(CIN),C2(COUTP),C3(COUTN): 10µF
R1287x001B Efficiency vs. Output Current
R1287x001C Efficiency vs. Output Current
Quality & Packages
| Product Name | Compatibility | Package | Marking | Reliability |
|---|---|---|---|---|
| R1287Zxxxx-E2-F |
|
WLCSP-12-P1 | R1287Z | R1287Z-F |
| R1287Lxxxx-TR |
|
DFN3030-12 | R1287L | R1287L |
C
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Refer to the datasheets for the details on the product.
The package file includes package dimensions, taping specifications, taping reels dimensions, power dissipations, and recommended land pattern.
Please contact us or our distributors for unpublished reliability information.
Sample / Buy
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Authorized Distributors
Please contact your local distributors for any sales-related inquiry such as price, stock, delivery, etc.
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 |