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Analog Devices Inc./Maxim Integrated MAX860ISA-T
- Part No.:
- MAX860ISA-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX860ISA-T.pdf
- Description:
- IC REG CHARG PUMP INV 50MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,212
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Product details
Overview
MAX860ISA-T from Maxim Integrated is a frequency-selectable, 50mA switched-capacitor voltage converter that inverts +1.5V to +5.5V inputs or doubles +2.5V to +5.5V inputs. It operates at three selectable switching frequencies (6kHz/50kHz/130kHz), delivers 87% efficiency at 50mA load, and features 12Ω output resistance and 200µA quiescent current - ideal for low-noise, inductorless power conversion in portable medical instruments.
For engineers reviewing the MAX860ISA-T datasheet, MAX860ISA-T pinout, MAX860ISA-T application, or MAX860ISA-T equivalent, key selection considerations include its SO-8 package compatibility, active-low shutdown (<1µA), LV pin configuration for inverter/doubler mode, and trade-offs between capacitor size, ripple, and quiescent current across FC pin settings.
Technical Context
The MAX860ISA-T implements a BiCMOS charge-pump architecture with direct oscillator-to-switch coupling (no frequency division), enabling precise control of switching frequency via the FC pin. Its internal switch resistance (~8Ω) combines with external capacitor ESR to define total output resistance (ROUT = RO + 4×ESRC1 + ESRC2 + 1/(fS×C1)).
It supports two operating modes: inverter (LV = GND) delivering −VIN ± droop, and doubler (LV = OUT) delivering +2VIN ± droop. Shutdown is asserted by pulling SHDN low, reducing supply current to <1µA while preserving reverse-current path behavior dependent on mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 50mA maximum continuous - sufficient to replace inductive regulators in low-power analog rails. |
| Switching Frequencies | 6kHz / 50kHz / 130kHz - selected via FC pin to optimize capacitor size vs. EMI vs. quiescent current. |
| Efficiency | 87% at 50mA load - enables battery runtime extension in portable systems without inductors. |
| Quiescent Current | 200µA typical - minimizes standby drain in always-on sensor subsystems. |
| Output Resistance | 12Ω typical (with 10µF/0.2Ω ESR caps) - determines load regulation: ~0.6V drop at 50mA from nominal −VIN. |
| Shutdown Current | <1µA - ensures zero-load battery isolation in sleep-mode medical devices. |
| Input Voltage Range | +1.5V to +5.5V (inverter), +2.5V to +5.5V (doubler) - supports single-cell Li-ion down to 2.5V and dual-cell alkaline. |
Pinout & Package
MAX860ISA-T is housed in an 8-pin SO (Small Outline) package per outline 21-0041, RoHS-compliant, with 1.27mm pitch and standard JEDEC MS-012AC footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 8) | Positive input supply | Accepts +1.5V to +5.5V; powers internal oscillator and switches. |
| SHDN (Pin 7) | Active-low shutdown control | Pull low to disable charge pump; connect to VDD for permanent enable in inverter mode. |
| OUT (Pin 5) | Negative output (inverter) or doubled positive output (doubler) | Delivers −VIN or +2VIN depending on LV pin state; drives loads up to 50mA. |
| LV (Pin 6) | Mode select | Connect to GND for inverter; connect to OUT for doubler - defines topology and input range. |
| FC (Pin 1) | Frequency control | Selects 6kHz (open/VDD), 50kHz (GND), or 130kHz (OUT) - sets capacitor sizing and noise profile. |
| C1+ (Pin 2) & C1− (Pin 4) | Flying capacitor terminals | Interface with external C1 (e.g., 4.7–68µF); polarity matters only in doubler configuration. |
| GND (Pin 3) | Ground reference | Common return for VDD, C1−, and load; must be low-impedance for stable ripple performance. |
Key Features
| Feature | Design Value |
|---|---|
| Inverter/doubler topology selection | Single-pin LV configuration enables dual functionality without external logic or BOM change. |
| Three-frequency switching | FC pin offers discrete frequency options to balance capacitor cost (low fS → larger C1), EMI (high fS → above sensitive bands), and IQ (low fS → lower supply current). |
| Low-quiescent-current shutdown | <1µA shutdown current preserves battery life in intermittent-use handheld diagnostics equipment. |
| Inductorless design | Eliminates magnetic components, reducing PCB area, EMI, and cost versus buck/boost regulators. |
| SO-8 package compatibility | Pinout matches legacy ICL7660/MAX660 sockets with minimal wiring change (SHDN ↔ OSC jumper required). |
Applications
| Portable Medical Sensors | Handheld Test Equipment |
|---|---|
|
Use Scenario: Powering dual-rail op-amps in battery-operated ECG front-ends requiring ±5V from a single 3.7V Li-ion cell. IC Role / Device Role / Timing Role: Inverter generating clean −3.7V rail; FC set to 130kHz to minimize 10µF flying cap size and avoid audio-band noise. Use Value: Enables compact, silent analog signal conditioning without inductors or LDO post-regulation. |
Use Scenario: Supplying ±12V rails for precision ADC drivers in field-deployable multimeters powered by AA batteries. IC Role / Device Role / Timing Role: Cascaded MAX860ISA-T pair generating −7.4V (first stage) and −14.8V (second stage); LV = GND on both. Use Value: Doubles effective voltage gain per stage while maintaining <1µA shutdown leakage across all units. |
| Operational-Amplifier Power Supplies | Interface Power Supplies |
|
Use Scenario: Biasing rail-to-rail op-amps in low-power data acquisition modules where space prohibits inductors. IC Role / Device Role / Timing Role: Single MAX860ISA-T in doubler mode (LV = OUT) delivering +5V from 2.5V input for RS-485 transceiver bias. Use Value: Achieves regulated-like performance (12Ω ROUT) with no feedback loop or external compensation. |
Use Scenario: Generating negative bias for LCD contrast control or RF switch gate drive in compact IoT gateways. IC Role / Device Role / Timing Role: Inverter mode with FC = GND (50kHz) to reduce EMI near 2.4GHz Wi-Fi band while using 10µF ceramic caps. Use Value: Provides stable −3.3V at 20mA with <10mVpp ripple - sufficient for analog interface ICs without additional filtering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switched-capacitor voltage converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX861ISA-T | Higher switching frequencies (13/100/250kHz); identical pinout and package; same 50mA rating and 12Ω ROUT. | Better suited for high-frequency noise-sensitive designs (e.g., RF receivers) due to 250kHz max fS. | Select MAX861ISA-T when minimizing capacitor size or avoiding sub-100kHz EMI is critical; otherwise MAX860ISA-T offers lower IQ at low fS. |
| MAX660CPA+ | 100mA output; fixed 5kHz/40kHz frequencies; higher 6.5Ω ROUT; requires OSC pin tie-off instead of SHDN. | Supports heavier loads but lacks frequency selectability and ultra-low shutdown current. | Choose MAX660CPA+ only if >50mA output is mandatory and FC flexibility is unnecessary; MAX860ISA-T provides superior EMI control and battery efficiency. |
Compared with MAX861ISA-T, the MAX860ISA-T trades higher-frequency capability for lower quiescent current at base frequency (6kHz), while both share identical SO-8 packaging and functional pinout. Against MAX660CPA+, MAX860ISA-T delivers finer EMI tuning and 100× lower shutdown current but at half the output current capacity.
Availability
MAX860ISA-T is available at Aetrix Electronics and suitable for portable medical sensors, handheld test equipment, operational-amplifier power supplies, interface power supplies, and battery-powered instrumentation requiring stable component supply with long-term lifecycle support.
Supply support for MAX860ISA-T 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 applications.
The MAX860/MAX861 product line was designed specifically to replace inductor-based DC-DC converters and legacy charge pumps (e.g., ICL7660) in space-constrained, low-EMI, battery-critical systems - emphasizing frequency agility, ultra-low shutdown current, and dual-mode operation.
FAQ
What is the maximum continuous output current specification for MAX860ISA-T?
The MAX860ISA-T is rated for 50mA maximum continuous output current under specified thermal conditions. This value is validated across the full operating temperature range (−25°C to +85°C) and represents the highest sustained load before significant voltage droop or thermal derating occurs. The MAX860ISA-T achieves this without inductors, making it suitable for replacing bulkier switching regulators in low-power analog rails.
How does the FC pin affect capacitor selection in MAX860ISA-T designs?
The FC pin on the MAX860ISA-T selects one of three switching frequencies (6kHz, 50kHz, or 130kHz), directly impacting optimal flying capacitor (C1) size: lower frequencies require larger C1 (e.g., 68µF at 6kHz) to maintain output resistance, while higher frequencies allow smaller values (e.g., 4.7µF at 130kHz). The MAX860ISA-T datasheet Table 3 provides recommended C1/C2 values per FC setting to balance ripple, size, and efficiency.
Can MAX860ISA-T operate as both a voltage inverter and a voltage doubler?
Yes, the MAX860ISA-T supports both topologies via the LV pin: connect LV to GND for inverting operation (−VIN output), or connect LV to OUT for doubling (+2VIN output). Input voltage ranges differ - inverter accepts +1.5V to +5.5V, while doubler requires +2.5V to +5.5V. Both modes retain identical FC, SHDN, and output current capabilities, allowing flexible reuse of the same MAX860ISA-T footprint.
What is the shutdown current consumption of MAX860ISA-T, and how is it enabled?
The MAX860ISA-T draws less than 1µA in shutdown mode, achieved by pulling the SHDN pin low. In inverter configuration, SHDN should be tied to VDD when not used to ensure normal operation; in doubler mode, it connects to GND when unused. This ultra-low shutdown current makes the MAX860ISA-T ideal for battery-powered devices requiring extended sleep periods without measurable self-discharge.
Is MAX860ISA-T pin-compatible with the ICL7660 or MAX660?
The MAX860ISA-T shares the same 8-pin SO package and core pin functions with the ICL7660 and MAX660, but requires one wiring modification: the ICL7660's OSC pin maps to MAX860ISA-T's SHDN pin, so OSC must be jumpered to VDD to enable the MAX860ISA-T permanently. All other pins (VDD, GND, C1+, C1−, OUT, FC/LV) align functionally, enabling drop-in replacement in many legacy designs with minimal board rework.
MAX860ISA-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Ratiometric
- Output Configuration:
- Positive or Negative
- Topology:
- Charge Pump
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.5V, 2.5V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- -Vin, 2Vin
- Voltage - Output (Max):
- -
- Current - Output:
- 50mA
- Frequency - Switching:
- 6kHz, 50kHz, 130kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -25°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX860ISA-T FAQ
1.How can I place an order for MAX860ISA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX860ISA-T 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 MAX860ISA-T reliable?
The price and inventory of MAX860ISA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX860ISA-T is usually 5 days.
3.What payment methods are accepted for MAX860ISA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX860ISA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX860ISA-T?
MAX860ISA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX860ISA-T 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 MAX860ISA-T?
For technical support, including MAX860ISA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX860ISA-T requirements.
6.How does Aetrix verify that MAX860ISA-T is sourced from the original manufacturer or authorized distributors?
All MAX860ISA-T 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 MAX860ISA-T meets industry standards.
7.What is the process for return or replacement of MAX860ISA-T?
All MAX860ISA-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX860ISA-T, 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 MAX860ISA-T part is unused and in its original packaging.
Return procedure for MAX860ISA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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