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Analog Devices Inc./Maxim Integrated MAX870EUK-TG069
- Part No.:
- MAX870EUK-TG069
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Special Purpose Regulators
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX870EUK-TG069.pdf
- Description:
- SWITCHED CAP VOLTAGE INVERTER
- Quantity:
- Payment:
- Shipping:
Inventory:837
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Product details
Overview
The MAX870EUK-TG069 from Maxim Integrated is a monolithic CMOS switched-capacitor voltage inverter that accepts +1.4V to +5.5V input and generates a regulated negative output (e.g., -5V from +5V) with 90% efficiency, 0.7mA quiescent current, and 25mA output capability - ideal for analog supply generation in space-constrained battery-powered systems.
For engineers reviewing the MAX870EUK-TG069 datasheet, MAX870EUK-TG069 pinout, MAX870EUK-TG069 application, or MAX870EUK-TG069 equivalent, key selection criteria include input voltage range, output current vs. load droop, oscillator frequency (125kHz), SOT23-5 package constraints, and capacitor-dependent ripple/efficiency trade-offs.
Technical Context
The MAX870EUK-TG069 implements a two-phase charge-pump topology using four on-chip power MOSFET switches and an internal 125kHz oscillator. It operates without inductors, relying solely on two external flying and reservoir capacitors (C1, C2) to invert VIN to VOUT ≈ –VIN.
Its output voltage is unregulated and load-dependent: VOUT = –(VIN – IOUT × RS–), where RS– ≈ 20Ω at +25°C and VIN = +5V. Efficiency peaks at 99% under no-load and drops to ~90% at 25mA due to fixed quiescent current and switch resistance losses.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | +1.4V to +5.5V - supports single-cell Li-ion, NiMH, and standard logic rails without external regulation. |
| Oscillator Frequency | 125kHz - enables use of low-cost 1µF ceramic capacitors while limiting EMI and switching loss. |
| Output Current | 25mA at 500mV drop - delivers usable negative rail for op-amps, sensors, or LCD bias under typical loads. |
| Quiescent Current | 0.7mA - minimizes standby power draw in always-on portable instrumentation. |
| Voltage Conversion Efficiency | 90% at 25mA / 99% at no-load - high efficiency preserves battery life across dynamic load profiles. |
| Output Resistance | ≈20Ω at +25°C - defines load-induced droop: e.g., 10mA load causes ~200mV VOUT shift from ideal –VIN. |
| Operating Temperature | –40°C to +85°C - qualified for industrial and medical handheld environments. |
Pinout & Package
MAX870EUK-TG069 is housed in a 5-pin SOT23-5 package (JEDEC MO-178AA), with exposed pad not electrically connected. Pin 1 is OUT (inverting charge-pump output); Pin 2 is IN (positive supply input); Pin 3 is C1– (flying capacitor negative terminal); Pin 4 is GND; Pin 5 is C1+ (flying capacitor positive terminal).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT (Pin 1) | Inverting charge-pump output | Delivers negative voltage rail; output impedance dominates load regulation - requires local bypassing for noise-sensitive analog stages. |
| IN (Pin 2) | Positive power-supply input | Accepts 1.4V–5.5V; supplies both internal oscillator and switching circuitry - must be bypassed with ≥0.1µF ceramic if sourced from high-impedance rail. |
| C1– (Pin 3) | Flying capacitor negative terminal | Connects to negative side of flying capacitor (C1); forms half of charge-transfer path - trace length must be minimized to reduce parasitic inductance. |
| GND (Pin 4) | Ground reference | Common return for IN, OUT, and C1–; must connect to low-impedance ground plane to limit switching noise coupling into analog circuits. |
| C1+ (Pin 5) | Flying capacitor positive terminal | Connects to positive side of flying capacitor (C1); switches between VIN and VOUT potentials - critical node for EMI control and capacitor ESR selection. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small footprint | 5-pin SOT23-5 package (2.9mm × 1.6mm) enables integration into compact PDAs, medical sensors, and wearable devices. |
| Capacitor-only design | Requires only two external capacitors (C1, C2) - eliminates inductors and simplifies layout versus inductive DC-DC inverters. |
| High conversion efficiency | 99% no-load efficiency reduces thermal stress and extends battery runtime in low-duty-cycle applications. |
| Low quiescent current | 0.7mA supply current allows continuous operation from coin cells or energy-harvesting sources. |
| Wide input compatibility | 1.4V minimum start-up voltage supports single alkaline or NiMH cells without pre-regulation. |
Applications
| Local -5V Supply from 5V Logic Supply | Small LCD Panels |
|---|---|
|
Use Scenario: Generating –5V from a microcontroller's +5V I/O rail to power op-amps or ADC reference buffers. IC Role / Device Role / Timing Role: Voltage inverter providing isolated negative bias without magnetic components. Use Value: Eliminates need for bulky inductor-based converters; achieves <200mV droop at 10mA load with 1µF ceramic caps. |
Use Scenario: Biasing segment drivers in monochrome STN LCD modules requiring –3V to –5V gate drive. IC Role / Device Role / Timing Role: Charge-pump inverter supplying stable negative VEE for LCD contrast control. Use Value: Delivers 20mA at –4.0V with <50mVp-p ripple using 0.47µF X7R ceramics - meets display response time specs. |
| Cell Phones | Medical Instruments |
|
Use Scenario: Powering RF front-end ICs or audio codecs needing clean –2.5V supply in ultra-thin handset designs. IC Role / Device Role / Timing Role: Compact negative rail generator co-located with analog subsystems. Use Value: SOT23-5 footprint fits within tight board area budgets; 125kHz switching avoids GSM band interference. |
Use Scenario: Providing isolated –5V for precision sensor signal conditioning in portable ECG or glucose meters. IC Role / Device Role / Timing Role: Low-noise inverter supporting 16-bit ADC performance with minimal PSRR degradation. Use Value: 0.7mA IQ enables >100-hour battery life in intermittent-use diagnostics; output ripple <30mVp-p with proper layout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage inverter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX871EUK | 500kHz oscillator, optimized for 0.33µF capacitors; higher switching loss but lower output ripple at light loads. | Better suited for noise-sensitive audio paths where 500kHz harmonics fall outside audible band. | Select MAX871EUK when minimizing output ripple with smaller capacitors is prioritized over peak efficiency. |
| MAX860ESA+ | µMAX-8 package; delivers 50mA output with 600mV dropout; includes internal compensation for stability with larger capacitors. | Supports higher-current analog rails (e.g., CCD bias, multi-op-amp stages) where MAX870EUK-TG069's 25mA is insufficient. | Choose MAX860ESA+ when >30mA negative current is required and board space permits 3mm × 3mm µMAX footprint. |
Compared with MAX871EUK and MAX860ESA+, the MAX870EUK-TG069 offers optimal balance of size, efficiency, and simplicity for ≤25mA inverter needs - its 125kHz operation eases EMI filtering, while SOT23-5 placement flexibility supports dense mixed-signal layouts.
Availability
MAX870EUK-TG069 is available at Aetrix Electronics and suitable for battery-operated equipment, portable medical instruments, and small LCD panel designs requiring stable component supply and long-term production continuity.
Supply support for MAX870EUK-TG069 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Maxim Integrated (now part of Analog Devices) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, medical, and communications markets.
The MAX870/MAX871 family was designed specifically for compact, inductorless negative voltage generation in portable electronics - emphasizing ultra-low quiescent current, minimal external component count, and robust operation across wide input ranges.
FAQ
What is the maximum output current specification for MAX870EUK-TG069?
The MAX870EUK-TG069 delivers up to 25mA output current with a typical voltage drop of 500mV at full load. Absolute maximum rated output current is 50mA, but sustained operation above 25mA degrades regulation and efficiency significantly due to internal switch resistance and thermal limits in the SOT23-5 package.
Does MAX870EUK-TG069 include shutdown control?
No, the MAX870EUK-TG069 does not integrate logic-controlled shutdown. It operates continuously when powered. For shutdown functionality, Maxim recommends the pin-compatible MAX1720/MAX1721, or external control via the IN pin using a buffer circuit (as shown in Figure 8 of the MAX870/MAX871 datasheet).
What capacitor values are recommended for stable operation of MAX870EUK-TG069?
For stable operation, the MAX870EUK-TG069 requires a 1µF ceramic flying capacitor (C1) and a 1µF ceramic reservoir capacitor (C2), both with low ESR (<100mΩ). Table 2 in the datasheet confirms these values minimize output resistance (≈23Ω) and support 25mA output with acceptable ripple.
Can MAX870EUK-TG069 generate voltages other than –VIN?
No - the MAX870EUK-TG069 is a fixed-ratio inverter and cannot regulate or scale output beyond –VIN ± droop. Its output is inherently load-dependent: VOUT = –(VIN – IOUT × RS–). For adjustable or regulated negative outputs, consider the MAX864 or MAX865 charge-pump controllers.
Is MAX870EUK-TG069 RoHS compliant and lead-free?
Yes, the MAX870EUK-TG069 is RoHS-compliant and lead-free per Maxim Integrated's standard packaging specifications for SOT23-5 devices manufactured after 2006. The "TG069" suffix indicates tape-and-reel packaging with lead-free finish and JEDEC-standard moisture sensitivity level (MSL3).
MAX870EUK-TG069 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Bulk
- Product Status:
- Active
- Applications:
- Charge Pump, LCD
- Voltage - Input:
- 1.4V ~ 5.5V
- Number of Outputs:
- 1
- Voltage - Output:
- -1.4V ~ -5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX870EUK-TG069 FAQ
1.How can I place an order for MAX870EUK-TG069 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX870EUK-TG069 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MAX870EUK-TG069 reliable?
The price and inventory of MAX870EUK-TG069 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX870EUK-TG069 is usually 5 days.
3.What payment methods are accepted for MAX870EUK-TG069?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX870EUK-TG069 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX870EUK-TG069?
MAX870EUK-TG069 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX870EUK-TG069 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MAX870EUK-TG069?
For technical support, including MAX870EUK-TG069 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX870EUK-TG069 requirements.
6.How does Aetrix verify that MAX870EUK-TG069 is sourced from the original manufacturer or authorized distributors?
All MAX870EUK-TG069 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX870EUK-TG069 meets industry standards.
7.What is the process for return or replacement of MAX870EUK-TG069?
All MAX870EUK-TG069 units undergo pre-shipment inspection (PSI). If there is an issue with MAX870EUK-TG069, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MAX870EUK-TG069 part is unused and in its original packaging.
Return procedure for MAX870EUK-TG069:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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