My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX766CSA+T
- Part No.:
- MAX766CSA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX766CSA+T.pdf
- Description:
- IC REG BUCK BOOST ADJ/-1V 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,215
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX766CSA+T from Maxim Integrated is a high-efficiency, current-limited PFM inverting DC-DC converter with internal P-channel power MOSFET, delivering up to 250mA at -15V output, 120µA max supply current, and 300kHz switching frequency. It operates from 3V to 16V input and supports fixed -15V or adjustable -1V to -16V output via external resistors - ideal for LCD bias generation in portable instrumentation.
For engineers reviewing the MAX766CSA+T datasheet, MAX766CSA+T pinout, MAX766CSA+T application, or MAX766CSA+T equivalent, key selection considerations include its ultra-low quiescent current, integrated switch architecture, negative output capability without external inverter stages, and compatibility with miniature 47µH surface-mount inductors.
Technical Context
The MAX766CSA+T employs a proprietary current-limited pulse-frequency modulation (PFM) control scheme that enforces a 16µs maximum on-time and 2.3µs minimum off-time, enabling high efficiency across light-to-heavy loads. Its BiCMOS process integrates a 0.75A peak-current-rated P-channel MOSFET on die, eliminating external switch requirements.
Operation relies on differential voltage between V+ and OUT (max 21V), with feedback referenced to a stable 1.5V internal reference. The device enters shutdown with <5µA supply current when SHDN is high, and supports dual-mode operation: fixed -15V output (via internal resistor divider) or adjustable output using external R1/R2.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed -15V ±4% (or adjustable -1V to -16V using external resistors) |
| Max Output Current | 250mA at -15V (limited by 0.75A peak LX current and thermal constraints) |
| Input Voltage Range | 3V to 16V - enables direct use with single Li-ion, multi-cell alkaline, or regulated 5V/12V rails |
| Supply Current (No Load) | ≤120µA - enables >1-year battery life in low-duty-cycle portable systems |
| Shutdown Current | ≤5µA - ensures minimal drain during system sleep modes |
| Switching Frequency | Up to 300kHz - allows use of compact <5mm-diameter SMT inductors (e.g., 47µH) |
| Reference Voltage | 1.500V ±30mV - provides precision feedback for stable output regulation |
Pinout & Package
MAX766CSA+T is housed in an 8-pin SO (Small Outline) package with exposed pad not present; pin 1 is OUT, pin 2 is FB, pin 3 is SHDN, pin 4 is REF, pin 5 is GND, pin 6 and 7 are V+, pin 8 is LX. All pins are surface-mount compatible with JEDEC MS-012AC footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT (Pin 1) | Inverting output node | Connects directly to negative output rail; senses output voltage via internal divider for fixed mode |
| FB (Pin 2) | Feedback input | Connected to REF for fixed -15V operation; tied to external resistor divider for adjustable output |
| SHDN (Pin 3) | Active-high shutdown control | TTL/CMOS-compatible input; pulls supply current to <5µA when high |
| REF (Pin 4) | 1.5V precision reference output | Sources up to 100µA; requires 0.1µF bypass capacitor to GND for stability |
| GND (Pin 5) | Analog/digital ground reference | Star-ground connection point for input/output capacitors and feedback network |
| V+ (Pins 6, 7) | Positive input supply | Must be shorted externally; accepts 3V–16V; requires local 0.1µF bypass capacitor |
| LX (Pin 8) | Drain of internal P-channel MOSFET | Switches between V+ and ~|VOUT|+0.4V; drives external inductor and catch diode |
Key Features
| Feature | Design Value |
|---|---|
| Current-limited PFM control | Enables >80% efficiency from 1mA to 250mA load while maintaining <120µA no-load IQ |
| Integrated P-channel MOSFET | Eliminates external switch, reduces BOM count, and simplifies layout for space-constrained designs |
| Dual-mode output configuration | Supports factory-preset -15V or user-adjustable -1V to -16V via two external resistors (R1 = 150kΩ) |
| Miniature magnetics support | 300kHz operation allows standard 47µH SMT inductors - no custom magnetics design required |
| Low-noise shutdown | Discharges OUT to GND and disables reference during shutdown, preventing floating outputs |
Applications
| LCD Bias Generation | Portable Instrumentation |
|---|---|
Use Scenario: Generating stable negative bias voltage for LCD segment drivers in handheld multimeters and oscilloscopes. IC Role / Device Role / Timing Role: Inverting DC-DC converter providing isolated -15V rail from single 9V alkaline or 3.7V Li-ion source. Use Value: Enables high-contrast display operation without external charge pumps or transformer-based inverters - reducing board area by >40%. |
Use Scenario: Powering analog front-end circuitry (op-amps, ADC references) requiring clean negative supply in battery-powered data loggers. IC Role / Device Role / Timing Role: Low-quiescent-current inverter supplying regulated -15V to precision signal conditioning stages. Use Value: Maintains 82% efficiency at 10mA load, extending battery life beyond 18 months in periodic-sampling applications. |
| LAN Adapter Power | Remote Data Acquisition |
Use Scenario: Providing isolated -12V to -15V for RS-485 transceiver bias in industrial Ethernet adapters. IC Role / Device Role / Timing Role: Compact inverter generating negative rail from 3.3V or 5V system bus, supporting hot-swap compliance. Use Value: Delivers 200mA at -15V with <50mV ripple (68µF OS-CON output cap), meeting EMI limits for Class B equipment. |
Use Scenario: Supplying negative voltage to sensor interface ICs (e.g., strain gauge bridges, thermocouple amps) in solar-powered remote telemetry nodes. IC Role / Device Role / Timing Role: Efficient inverter operating from wide-input 3V–16V range, compatible with MPPT charger outputs. Use Value: Supports full 250mA output at -15V with VIN ≥ 8V, enabling simultaneous operation of multiple analog sensors under low-light conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar inverting DC-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX776ESA+ | Higher output drive (5W), requires external P-channel MOSFET; wider VIN range (2.5V–16.5V); no internal switch | Better suited for >250mA loads or higher negative voltages (e.g., -24V); needs additional FET and gate driver layout | Select MAX776ESA+ only when MAX766CSA+T's 250mA limit is exceeded or when adjustable -24V output is required. |
| LM2662MM/NOPB | Charge-pump inverter (no inductor); fixed -5V output; 100mA max; 120µA IQ; 1MHz switching | Lower noise, smaller footprint, but limited to ≤-5V and <100mA; unsuitable for -15V or high-current LCD bias | Choose LM2662MM/NOPB for ultra-low-noise, low-current -5V generation where inductor-free design is mandatory. |
Compared with MAX776ESA+ and LM2662MM/NOPB, the MAX766CSA+T uniquely balances integrated switch simplicity, -15V capability, and 250mA output - making it optimal for cost-sensitive, medium-power inverting applications where inductor-based efficiency outweighs charge-pump convenience.
Availability
MAX766CSA+T is available at Aetrix Electronics and suitable for LCD bias generation, portable instrumentation, LAN adapter power, and remote data acquisition requiring stable component supply with guaranteed long-term sourcing.
Supply support for MAX766CSA+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, communications, and consumer applications.
The MAX764/MAX765/MAX766 family was designed specifically for compact, high-efficiency negative voltage generation in battery-powered and space-constrained systems - emphasizing ultra-low IQ, integrated power switches, and simplified magnetics.
FAQ
What output voltage does the MAX766CSA+T deliver by default?
The MAX766CSA+T delivers a factory-preset -15V output with ±4% tolerance when FB is connected to REF. This fixed output is achieved using an internal resistor divider referenced to the 1.5V internal reference. For adjustable operation from -1V to -16V, external resistors R1 (150kΩ) and R2 must be used per the formula R2 = R1 × |VOUT| / 1.5V. The MAX766CSA+T does not support positive output configurations.
Can the MAX766CSA+T operate from a 3.3V input supply?
Yes, the MAX766CSA+T supports input voltages from 3V to 16V, so 3.3V is within specification. However, delivering -15V output requires sufficient headroom: the absolute maximum V+–VOUT differential is 21V, and practical operation at 3.3V input is limited to outputs no more negative than approximately -12V due to efficiency and startup constraints. For reliable -15V output, a minimum 5V input is recommended. The MAX766CSA+T startup supply voltage vs. output current curve confirms stable operation above 4.2V at full 250mA load.
What is the maximum achievable output current from the MAX766CSA+T?
The MAX766CSA+T delivers up to 250mA continuous output current at -15V under typical conditions (TA = +25°C, 5V input). This limit arises from the 0.75A peak LX current rating, thermal dissipation in the SO package (471mW max at +70°C), and efficiency roll-off at higher loads. The "Maximum Output Current vs. Supply Voltage" graph shows 250mA is attainable at VIN ≥ 8V; at VIN = 5V, maximum output drops to ~200mA. Exceeding these values risks thermal shutdown or regulation loss.
How does the MAX766CSA+T achieve high efficiency at light loads?
The MAX766CSA+T uses a current-limited PFM scheme that dynamically adjusts peak inductor current: it starts with half the full-scale limit (0.375A) for the first two pulses to minimize energy waste during light-load regulation. If output remains out of regulation, it escalates to the full 0.75A peak. Combined with <120µA no-load supply current and 2.3µs minimum off-time control, this enables >80% efficiency even at 1mA load - significantly outperforming PWM converters that draw 2mA–10mA quiescent current.
What external components are mandatory for basic MAX766CSA+T operation?
Four external components are mandatory: a 47µH inductor (L1) between LX and VOUT, a Schottky catch diode (e.g., 1N5817) from LX to VOUT, a 120µF/20V input capacitor (C1) from V+ to GND, and a 0.1µF ceramic bypass capacitor (C2) placed directly between V+ and GND. For fixed -15V output, FB must be shorted to REF; for adjustable output, R1 (150kΩ) and R2 are required. A 0.1µF capacitor (C3) on REF is also strongly recommended.
MAX766CSA+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:
- Step-Up/Step-Down
- Output Configuration:
- Negative
- Topology:
- Buck-Boost
- Output Type:
- Adjustable (Fixed)
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 16V
- Voltage - Output (Min/Fixed):
- -1V (-15V)
- Voltage - Output (Max):
- -16V
- Current - Output:
- 105mA
- Frequency - Switching:
- 300kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX766CSA+T FAQ
1.How can I place an order for MAX766CSA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX766CSA+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 MAX766CSA+T reliable?
The price and inventory of MAX766CSA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX766CSA+T is usually 5 days.
3.What payment methods are accepted for MAX766CSA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX766CSA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX766CSA+T?
MAX766CSA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX766CSA+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 MAX766CSA+T?
For technical support, including MAX766CSA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX766CSA+T requirements.
6.How does Aetrix verify that MAX766CSA+T is sourced from the original manufacturer or authorized distributors?
All MAX766CSA+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 MAX766CSA+T meets industry standards.
7.What is the process for return or replacement of MAX766CSA+T?
All MAX766CSA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX766CSA+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 MAX766CSA+T part is unused and in its original packaging.
Return procedure for MAX766CSA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX766CSA+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…
