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MAX1681ESA+T

125mA charge-pump inverter, 2-5.5V, 125/500kHz, SOIC-8, no inductor

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制造商零件：

MAX1681ESA+T

包装：

SOIC-8 (4.9 x 3.9 x 1.5 mm)

品牌：
产品类别：
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说明

产品概览

The MAX1681ESA+T from Analog Devices (formerly Maxim) is a 125mA, charge-pump voltage inverter in an 8-pin SOIC package. Operating from 2.0V to 5.5V input, it generates a negative output voltage with only two external capacitors, requiring no inductors. Switching at 125kHz or 500kHz, it achieves up to 98% conversion efficiency.

主要规格

拓扑结构 Charge-Pump Voltage Inverter
输入电压 2.0V to 5.5V
输出电流 125 mA (max)
开关频率 125 kHz / 500 kHz (selectable)
Conversion Efficiency Up to 98%
Output Resistance 6 Ohm (typ @ 500kHz)
静态电流 500 uA (typ @ 500kHz)
关机电流 1 uA
工作温度 -40 to +85 C
包装 SOIC-8

特点

  • Inverts input voltage without inductors
  • Only 2 external capacitors required
  • 125mA output current capability
  • Pin-selectable 125kHz or 500kHz switching
  • Up to 98% conversion efficiency
  • 6 Ohm typical output resistance at 500kHz
  • Shutdown mode with 1uA current
  • +/-1% output voltage accuracy with low ESR caps
  • Drop-in replacement for ICL7660/S7660

应用

  • Negative supply generation for op-amps
  • LCD contrast control
  • RS-232 negative rail generation
  • Instrumentation dual-supply from single rail

The MAX1681ESA+T from Analog Devices is a 125mA charge-pump voltage inverter that converts a positive input voltage (2.0-5.5V) to a corresponding negative output using only two external capacitors. The ESA suffix denotes SOIC-8 package, +T indicates tape and reel. Pin-selectable switching frequency (125kHz or 500kHz) allows trade-off between output ripple and capacitor size. With 6 Ohm typical output resistance at 500kHz and up to 98% efficiency, it provides a compact inductor-free negative supply solution for op-amp biasing, LCD contrast control, and RS-232 negative rail generation.

The MAX1681 operates through three subsystems: (1) Charge-Pump Inverter: A switched-capacitor circuit uses two phases. During Phase 1, the flying capacitor (C1) charges from VIN through internal switches. During Phase 2, C1 is connected with its positive terminal to GND and negative terminal to the output, transferring charge to the output capacitor (C2) and producing -VIN at the output. (2) Frequency Selection: The FC pin selects between 125kHz (FC=GND) for lower switching noise and 500kHz (FC=VIN or floating) for smaller capacitors and lower output resistance. Higher frequency reduces the output impedance from 20 Ohm to 6 Ohm. (3) Shutdown: Driving SHDN low disables the oscillator and reduces supply current to 1uA.

针脚 名称 类型 说明
1 FC 输入 Frequency control (GND=125kHz, V+=500kHz)
2 C1+ 电源 Flying capacitor positive terminal
3 接地 电源 地面
4 C1- 电源 Flying capacitor negative terminal
5 出局 输出 Negative output voltage
6 LV 输入 Low-voltage mode (connect to OUT for Vin<3V)
7 SHDN 输入 Shutdown (active low)
8 V+ 电源 Positive supply input (2.0-5.5V)
  • Generating -5V from +5V for dual-supply op-amp circuits without inductors
  • LCD panel negative contrast voltage with 500kHz mode for compact capacitors
  • RS-232 negative rail from single +3.3V supply with 125mA drive
  • Portable instrument dual-rail supply using only 2 external capacitors
模型 制造商 Iout Frequency 说明
ICL7660SIBA 瑞萨 40mA 10kHz Lower current, lower cost
LM27762DSGR TI 250mA 2MHz Regulated LDO output
TPS60400DBVR TI 60mA 50kHz Smaller package
MAX828ESA+T ADI 50mA 12kHz SOT-23 package
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Contact Information

Email: info@materialparts.com

Tel / WhatsApp: +86 13760382860

服务与包装

Materialparts is a professional electronic component supplier based in Shenzhen, China, with over 20 years of global trading experience. We integrate component procurement, quality inspection, technical support, customized packaging, and global delivery services to provide one-stop supply chain solutions. Our business covers industrial control, automotive electronics, consumer electronics, medical devices and other industries. We always adhere to genuine sources, stable supply and considerate after-sales service.

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We specialize in a full range of passive and active electronic components, including SMD resistors, power resistors, connectors, aviation connectors, LED beads, flexible circuit boards, printed circuit boards, and integrated circuits. Our professional team provides BOM list consolidation, component matching, and alternative model recommendation services. We support sample orders, small-batch trial production, and mass production orders with flexible MOQs to meet diverse procurement needs.

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All products are sourced from official authorized channels and are 100% original genuine parts. Every batch of goods undergoes strict full-process quality inspection before delivery, with complete batch records and traceability documents provided. Our products comply with AEC-Q standards for automotive electronics and high-reliability specifications for medical devices. We eliminate counterfeits, refurbished parts and defective products from the source to secure your project production.

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Contact Information

For service consultation or packaging customization, please feel free to contact us:
Email: info@materialparts.com
Tel / WhatsApp: +86 13760382860
Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
 

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