My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX1680ESA+T
- Part No.:
- MAX1680ESA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX1680ESA+T.pdf
- Description:
- IC REG CHRG PUMP INV 125MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:6,323
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX1680ESA+T from Maxim Integrated is a frequency-selectable, inductorless switched-capacitor voltage inverter/doubler IC delivering up to 125mA output current with 3.5Ω typical output resistance. It operates from +2.0V to +5.5V input and supports dual switching frequencies (125kHz/250kHz) for capacitor size optimization. It is used in op-amp power supplies and local negative rail generation where board space and BOM cost are constrained.
For engineers reviewing the MAX1680ESA+T datasheet, MAX1680ESA+T pinout, MAX1680ESA+T application, or MAX1680ESA+T equivalent, key selection criteria include its 125mA load capability, selectable 125/250kHz operation, SO-8 package compatibility, and shutdown current <1µA - critical for low-power portable and interface power designs.
Technical Context
The MAX1680ESA+T implements a charge-pump topology with internal flying-capacitor switching controlled by an oscillator whose frequency is set via the FSEL pin (125kHz when high, 250kHz when low). It features no internal voltage divider or regulation loop - output voltage is unregulated but stabilized by low 3.5Ω effective output resistance.
Its circuit architecture supports two configurations: inverter (LV = GND, OUT = –VIN) and doubler (LV = OUT, OUT = +2VIN), with SHDN enabling CMOS-controlled shutdown that pulls OUT to GND in inverter mode. The device requires only three external capacitors (C1, C2, and input bypass) and exhibits 90% peak efficiency at 125mA under optimal conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 125mA max - enables replacement of inductor-based regulators in space-constrained applications |
| Switching Frequency | 125kHz (FSEL = IN) or 250kHz (FSEL = LV) - selects capacitor size: 4.7µF required at 125kHz |
| Input Voltage Range | +2.0V to +5.5V - supports single-cell Li-ion, 3.3V, and 5V logic rails without level shifting |
| Output Resistance | 3.5Ω typical - yields only 440mV drop at 125mA load, minimizing voltage sag |
| Shutdown Current | <1µA - essential for battery-powered systems requiring ultra-low quiescent power |
| Efficiency | 90% peak - achieved with low-ESR capacitors and optimized switching frequency selection |
| Operating Temp | –40°C to +85°C - qualified for industrial and automotive-adjacent environments |
Pinout & Package
MAX1680ESA+T is housed in an 8-pin SO (Small Outline) package with standard JEDEC MS-012AC footprint (5.0mm × 6.2mm, 1.27mm pitch). Pin 1 is marked with a beveled corner or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FSEL (Pin 1) | Frequency select input | CMOS-level control: high = 125kHz, low = 250kHz - sets trade-off between capacitor size and supply current |
| CAP+ (Pin 2) | Positive flying capacitor terminal | Connects to one side of external charge-pump capacitor C1 - carries bidirectional high-frequency AC current |
| GND (Pin 3) | Power ground reference | Primary return path for all internal switches and output current - must be low-impedance connection |
| CAP− (Pin 4) | Negative flying capacitor terminal | Connects to other side of C1 - forms charge-transfer path during switching phases |
| OUT (Pin 5) | Negative or doubled output | In inverter config: –VIN; in doubler config: +2VIN - sinks/source up to 125mA with 3.5Ω effective impedance |
| LV (Pin 6) | Logic voltage reference | Must be tied to GND for inverter mode or to OUT for doubler mode - defines output polarity configuration |
| SHDN (Pin 7) | Shutdown enable input | CMOS-compatible: high = shutdown (<1µA IQ, OUT pulled to GND); low = active - no shutdown in doubler mode |
| IN (Pin 8) | Positive input supply | Accepts +2.0V to +5.5V - powers internal oscillator and switches; bypass capacitor required at this pin |
Key Features
| Feature | Design Value |
|---|---|
| Configurable topology | Hardware-selectable inverter or doubler via LV pin connection - eliminates need for separate part numbers |
| Low-output-impedance design | 3.5Ω typical output resistance - maintains stable output under dynamic loads without feedback compensation |
| Capacitor-optimized frequency options | 125kHz/250kHz selection - allows use of smaller 4.7µF ceramic caps instead of larger electrolytics |
| Ultra-low shutdown current | <1µA - reduces standby power in always-on systems such as sensor nodes and interface peripherals |
| High-efficiency charge-pump core | 90% peak efficiency - minimizes thermal rise and extends battery life in portable instrumentation |
Applications
| Op-Amp Dual-Rail Power | RS-232 Interface Supply |
|---|---|
Use Scenario: Generating –5V rail for precision op-amps in single-supply data acquisition systems. IC Role / Device Role / Timing Role: Voltage inverter providing clean, low-noise negative supply referenced to system ground. Use Value: Eliminates need for bulky inductors and reduces PCB area by >40% versus inductive converters while maintaining 125mA capability. |
Use Scenario: Providing ±12V bias for RS-232 transceivers in embedded controllers with only a +5V rail available. IC Role / Device Role / Timing Role: Doubler + inverter cascade (or single-device combined config) generating both positive and negative interface voltages. Use Value: Enables full RS-232 compliance using only two external 4.7µF capacitors and no magnetics - ideal for compact IoT gateways. |
| MOSFET Gate Bias | Local Negative Supply for ADC Reference |
Use Scenario: Generating –10V gate drive for high-side N-channel MOSFETs in half-bridge motor drivers. IC Role / Device Role / Timing Role: Inverter configured to deliver regulated-negative bias independent of main DC bus fluctuations. Use Value: Delivers 125mA peak current with 440mV drop at full load - ensures robust turn-off margin even under transient load conditions. |
Use Scenario: Creating stable –2.5V reference supply for 16-bit SAR ADCs requiring low-noise, low-drift analog rails. IC Role / Device Role / Timing Role: Low-ripple inverter supplying dedicated analog ground-referenced negative rail. Use Value: 3.5Ω output resistance and 90% efficiency minimize thermal drift and supply-induced noise coupling into precision analog signal paths. |
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 |
|---|---|---|---|
| MAX1681ESA+ | Higher-frequency option: 500kHz/1MHz switching - supports 1µF capacitors vs. 4.7µF for MAX1680ESA+T | Better suited for ultra-compact layouts and higher-frequency noise-sensitive systems; lower EMI at same capacitance | Select MAX1681ESA+ when board space is critical and 1µF low-ESR ceramics are preferred over 4.7µF |
| MAX860ESA+ | 50mA output current, µMAX-8 package - lower current, smaller footprint, different pinout and shutdown polarity | Targeted at low-power sensors and wearables; not a direct replacement due to current and package mismatch | Choose MAX860ESA+ only for sub-50mA applications where µMAX size and cost outweigh need for 125mA capability |
Compared with MAX1681ESA+, MAX1680ESA+T trades higher capacitor size (4.7µF) for lower switching losses and reduced EMI sensitivity; compared with MAX860ESA+, it delivers 2.5× more output current in a larger SO-8 package - making it optimal for industrial interface and analog subsystems needing robust, capacitor-efficient inversion.
Availability
MAX1680ESA+T is available at Aetrix Electronics and suitable for op-amp dual-rail power, RS-232 interface supply, and MOSFET gate bias applications requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for MAX1680ESA+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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, communications, and computing markets.
The MAX1680/MAX1681 product line was designed to replace inductor-based DC-DC converters in space- and cost-constrained applications, offering high-current switched-capacitor voltage inversion and doubling with minimal external components.
FAQ
What is the maximum output current of the MAX1680ESA+T?
The MAX1680ESA+T delivers up to 125mA output current in both inverter and doubler configurations, verified under typical operating conditions (VIN = 5V, C1 = C2 = 4.7µF, TA = +25°C). This rating assumes proper thermal layout and low-ESR external capacitors - exceeding 125mA risks voltage droop beyond specification and potential thermal stress on the MAX1680ESA+T.
How does the FSEL pin affect MAX1680ESA+T operation?
The FSEL pin on the MAX1680ESA+T selects between two fixed switching frequencies: 125kHz (FSEL = high) and 250kHz (FSEL = low). This choice directly determines minimum external capacitor values - 4.7µF is required at 125kHz, while 250kHz allows slightly smaller caps. The MAX1680ESA+T datasheet confirms FSEL is a CMOS-compatible input with thresholds referenced to LV.
Can MAX1680ESA+T be used in voltage doubler mode?
Yes, the MAX1680ESA+T supports voltage doubling by connecting the LV pin to the OUT pin, as documented in the Typical Operating Circuits section. In this configuration, it generates +2VIN from a +2.0V to +5.5V input, delivering up to 125mA with comparable output resistance and efficiency to inverter mode - confirmed by electrical characteristics tables for both configurations.
What is the shutdown behavior of MAX1680ESA+T?
When SHDN is driven high, the MAX1680ESA+T enters shutdown mode with supply current dropping below 1µA. In inverter configuration (LV = GND), OUT is actively pulled to GND. In doubler mode (LV = OUT), shutdown is not functional - the MAX1680ESA+T datasheet explicitly states SHDN must be tied to OUT in that case to avoid undefined operation.
Is MAX1680ESA+T pin-compatible with MAX860ESA+?
No, MAX1680ESA+T is not pin-compatible with MAX860ESA+. They differ in package (SO-8 vs. µMAX-8), pin functions (e.g., SHDN polarity and FSEL implementation), and output current capability (125mA vs. 50mA). The MAX1680ESA+T datasheet notes compatibility is limited to functional substitution with wiring changes - not drop-in replacement.
MAX1680ESA+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:
- Active
- Function:
- Ratiometric
- Output Configuration:
- Positive or Negative
- Topology:
- Charge Pump
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- -Vin, 2Vin
- Voltage - Output (Max):
- -
- Current - Output:
- 125mA
- Frequency - Switching:
- 125kHz, 250kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX1680ESA+T FAQ
1.How can I place an order for MAX1680ESA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1680ESA+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 MAX1680ESA+T reliable?
The price and inventory of MAX1680ESA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1680ESA+T is usually 5 days.
3.What payment methods are accepted for MAX1680ESA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1680ESA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1680ESA+T?
MAX1680ESA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1680ESA+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 MAX1680ESA+T?
For technical support, including MAX1680ESA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1680ESA+T requirements.
6.How does Aetrix verify that MAX1680ESA+T is sourced from the original manufacturer or authorized distributors?
All MAX1680ESA+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 MAX1680ESA+T meets industry standards.
7.What is the process for return or replacement of MAX1680ESA+T?
All MAX1680ESA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1680ESA+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 MAX1680ESA+T part is unused and in its original packaging.
Return procedure for MAX1680ESA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX1680ESA+T Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
