R1287 系列
PWM/VFM,双通道升压/反转DC/DC转换器，带同步整流器功能，用于LCD
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概述
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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规格
消费 输入电压范围 2.5 V to 5.5 V (6.0 V) 工作温度范围 -40°C to 85°C (125°C) 电源电流 Typ. 470 µA 待机电流 Typ. 0.1 µA 输出电压范围 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)输出电压精度 Boost: ±0.9% / Inverting; ±1% 反馈电压 Boost: 1.0 V / Inverting; 0 V 反馈电压精度 Boost: ±15 mV / Inverting: ±30 mV 输出电流 Boost , Inverting: 200 mA (B/D/F/H), 100 mA (C/G) 振荡器频率 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)最大占空比 Boost , Inverting: Typ. 90% (B/D/F/H), Typ. 97% (C/G) 封装 WLCSP-12-P1, DFN3030-12 保护回路/功能
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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技术资料
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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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品质&封装
产品名称 对应 封装 标注 信赖性 R1287Zxxxx-E2-F WLCSP-12-P1 R1287Z R1287Z-F R1287Lxxxx-TR DFN3030-12 R1287L R1287L - 有关产品的详细信息，请参见数据表。
- 封装文件包括封装尺寸，卷带规格，卷带盘尺寸，功耗和建议的焊盘图案。
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下载数据表
功能说明
| TSD | 热关断电路 |
|---|---|
| ILX | LX Current Limit Function |
| OCP | 过流保护 |
| OVP | 过压保护 |
| UVLO | 欠压锁定功能 |
| OVLO | Overvoltage Lockout Protection |
| Reverse | 反向电流保护电路 |
| Shutdown | 关机功能 |
| Soft Start | 软启动功能 |
| SSCG | Spread Spectrum Clock Generator Function |
| PGOOD | Power Good Output |
| Auto Discharge | 自动放电功能 |
| Anti-ringing | Anti-ringing Switch Function |
| Sequencing | Start-up Sequencing Control |
| Max Duty | 最大占空比 |
| Ext. Phase | 外部可调相位补偿 |
| LED Adjust | LED High-speed Dimming Control |