My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX765CPA+
- Part No.:
- MAX765CPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX765CPA+.pdf
- Description:
- IC REG BUCK BOOST ADJ/-1V 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,001
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX765CPA+ from Maxim Integrated is a high-efficiency, current-limited PFM inverting DC-DC converter delivering -12V output at up to 250mA, with 120µA max supply current, 3V–16V input range, and internal P-channel MOSFET. It targets battery-powered portable instruments and remote data-acquisition systems requiring compact, low-quiescent-power negative voltage generation.
For engineers reviewing the MAX765CPA+ datasheet, MAX765CPA+ pinout, MAX765CPA+ application, or MAX765CPA+ equivalent, key selection considerations include its fixed -12V output, 300kHz switching frequency enabling <5mm SMT magnetics, shutdown current <5µA, peak LX current limit of 0.75A, and compatibility with standard 47µH inductors and Schottky diodes like 1N5817.
Technical Context
The MAX765CPA+ employs a proprietary current-limited pulse-frequency modulation (PFM) control scheme that enforces a 16µs maximum on-time and 2.3µs minimum off-time, while dynamically adjusting peak current between 0.375A (light load) and 0.75A (heavy load) to sustain >80% efficiency across 0.1–250mA loads. Its BiCMOS architecture integrates a P-channel power MOSFET with 1.4Ω typical on-resistance.
Operation relies on differential supply between V+ and OUT pins, limiting VIN–VOUT differential to 21V absolute maximum. The 1.5V internal reference (REF) feeds the FB comparator, and regulation is achieved by sensing voltage at OUT relative to GND via the FB pin-either directly (fixed mode) or through an external resistor divider (adjustable mode).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed -12V (±4%), enabling direct LCD bias or op-amp dual-rail supply without external feedback resistors. |
| Max Output Current | 250mA at V+ = 5V; derates to ~150mA at V+ = 3V per max-output-current vs. supply-voltage curve. |
| Supply Current (No Load) | 120µA max (typ. 90µA), minimizing battery drain in always-on portable instrumentation. |
| Shutdown Current | 5µA max (typ. 2µA), allowing deep-sleep modes in remote sensor nodes. |
| Switching Frequency | Up to 300kHz, permitting use of miniature surface-mount inductors ≤5mm diameter (e.g., 47µH). |
| Input Voltage Range | 3V to 16V, supporting single-cell Li-ion (4.2V), dual-cell alkaline (3V), or industrial 12V rails. |
| Peak LX Current Limit | 0.75A, defining maximum inductor energy storage and enabling continuous conduction mode above ~100mA. |
Pinout & Package
MAX765CPA+ uses an 8-pin plastic DIP package (0.300" wide), with GND, V+, LX, REF, SHDN, FB, and OUT pins arranged as shown in the top-view diagram. Thermal performance supports 727mW dissipation at +70°C ambient before derating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 5) | Ground reference | Common return for all internal circuits and external bypass capacitors; must connect to star ground point. |
| V+ (Pins 6,7) | Positive input supply | Dual-pin connection for low-impedance path; requires 0.1µF ceramic capacitor placed adjacent to pins. |
| LX (Pin 8) | Drain of internal P-MOSFET | Switching node driving inductor; swings from V+ (ON) to |VOUT|+diode-drop (OFF); peak current limited to 0.75A. |
| REF (Pin 4) | 1.5V precision reference output | Sources up to 100µA; bypassed with 0.1µF capacitor to stabilize feedback loop and reduce noise coupling. |
| SHDN (Pin 3) | Active-high shutdown control | TTL/CMOS-compatible; pulls supply current to <5µA when high; tie to GND for normal operation. |
| FB (Pin 2) | Feedback input | Compares divided output voltage against REF; shorted to REF for fixed -12V mode; connects to R1/R2 divider for adjustable outputs. |
| OUT (Pin 1) | Output sense node | Connects directly to negative output rail; provides voltage feedback path for regulation in fixed-output configuration. |
Key Features
| Feature | Design Value |
|---|---|
| Current-limited PFM control | Enables >80% efficiency from 0.1mA to 250mA by dynamically scaling peak switch current and enforcing min/max timing constraints. |
| Integrated P-channel MOSFET | Eliminates external high-side switch; 1.4Ω typical on-resistance reduces component count and PCB area in space-constrained designs. |
| Ultra-low quiescent current | 120µA max supply current allows multi-year battery life in low-duty-cycle remote sensors and handheld meters. |
| Wide input voltage range | 3V–16V operation supports diverse sources-from single Li-ion cells to 12V industrial buses-without external regulators. |
| Fixed -12V output option | Removes need for external feedback network, simplifying BOM and layout for applications requiring standardized negative bias rails. |
Applications
| Portable Instruments | LCD-Bias Generators |
|---|---|
Use Scenario: Handheld multimeters and portable oscilloscopes requiring stable -12V rail for analog front-end op-amps and ADC references. IC Role / Device Role / Timing Role: Inverting DC-DC converter generating regulated negative supply from single positive battery source. Use Value: Enables true bipolar signal conditioning with minimal external components and <120µA idle draw, extending battery runtime. |
Use Scenario: Monochrome or segment-based LCD displays in medical devices and industrial HMIs needing -12V VEE bias. IC Role / Device Role / Timing Role: Fixed-output negative voltage generator powering LCD common electrode and contrast control circuitry. Use Value: Delivers precise -12V ±4% without trimming, supporting consistent display contrast across temperature and battery discharge. |
| Remote Data-Acquisition Systems | Battery-Powered Applications |
Use Scenario: Wireless sensor nodes deployed in inaccessible locations, powered by AA/AAA batteries for multi-year operation. IC Role / Device Role / Timing Role: Low-IQ inverter supplying -12V to precision instrumentation amplifiers and isolated RS-485 transceivers. Use Value: Achieves >80% efficiency down to 100µA load, minimizing wasted energy during long sleep intervals between measurements. |
Use Scenario: Portable gas detectors and handheld analyzers operating from two alkaline cells (3V nominal). IC Role / Device Role / Timing Role: Input-voltage-flexible inverter sustaining -12V output even as battery decays from 3.2V to 2.4V under load. Use Value: Maintains regulation across full battery discharge curve, avoiding system reset or sensor drift due to rail collapse. |
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 |
|---|---|---|---|
| MAX775CPA+ | Same pinout, -12V fixed output, but uses external P-channel MOSFET; supports up to 5W output power and higher current. | Required for loads >250mA or where thermal management favors external FET placement. | Select MAX775CPA+ only when output current exceeds 250mA or board layout requires separation of power switch and controller. |
| LM2662MX/NOPB | Charge-pump inverter (no inductor); delivers only -5.5V at 100mA; no PFM control; 170µA quiescent current. | Suitable for ultra-low-noise, low-current applications where EMI from inductive switching must be avoided. | Choose LM2662MX/NOPB for sub-100mA, low-EMI, inductor-free designs-never as direct replacement for MAX765CPA+'s 250mA capability. |
Compared with MAX765CPA+, MAX775CPA+ offers higher power delivery using an external switch but increases component count and layout complexity, while LM2662MX/NOPB trades output current and voltage flexibility for charge-pump simplicity and zero inductor requirements.
Availability
MAX765CPA+ is available at Aetrix Electronics and suitable for portable instruments, LCD-bias generators, remote data-acquisition systems, and battery-powered applications requiring stable component supply with guaranteed long-term sourcing.
Supply support for MAX765CPA+ 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 markets.
The MAX764/MAX765/MAX766 family was designed specifically for low-power, inverting DC-DC conversion in battery-operated equipment-emphasizing ultra-low IQ, integrated power switches, and compatibility with miniature magnetics.
FAQ
What is the output voltage of the MAX765CPA+?
The MAX765CPA+ provides a fixed -12V output with ±4% tolerance over temperature and load. This is factory-preset and does not require external feedback resistors-unlike the adjustable MAX765 variants. The MAX765CPA+ achieves this using an internal resistor divider tied to the 1.5V reference, making it ideal for applications needing a stable negative rail without design overhead.
Can the MAX765CPA+ operate from a 3V input?
Yes, the MAX765CPA+ supports a 3V to 16V input range. At 3V input, it maintains regulation down to ~150mA output current per the "Maximum Output Current vs. Supply Voltage" graph. However, startup requires V+ ≥ 3.0V, and efficiency drops below 70% at light loads-so it remains viable for low-power 3V battery systems, especially when paired with a 47µH inductor and 1N5817 diode.
What is the shutdown current specification for MAX765CPA+?
The MAX765CPA+ draws ≤5µA (typ. 2µA) in shutdown mode when SHDN is pulled high. This ultra-low leakage enables multi-year battery life in intermittently active devices such as remote sensors. During shutdown, the internal reference and bias circuitry are disabled, and the OUT pin discharges to GND-ensuring no residual voltage interferes with downstream circuitry.
Does MAX765CPA+ require an external MOSFET?
No, the MAX765CPA+ integrates a P-channel power MOSFET with 1.4Ω typical on-resistance, eliminating the need for external switching elements. This integration reduces bill-of-materials cost and PCB footprint-critical for compact portable designs. For higher power (>5W) or thermal isolation needs, Maxim recommends the pin-compatible MAX775CPA+, which drives an external P-FET.
What inductor value is recommended for MAX765CPA+?
A 47µH inductor is explicitly recommended for the MAX765CPA+ across most applications. It balances size, saturation margin (≥0.75A peak), and DC resistance (<100mΩ preferred). Surface-mount types like Matsuo 267 series or Sumida RCH895 series meet these specs and enable layouts under 5mm in diameter-leveraging the device's 300kHz switching frequency for miniaturization.
MAX765CPA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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 (-12V)
- Voltage - Output (Max):
- -16V
- Current - Output:
- 120mA
- Frequency - Switching:
- 300kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX765CPA+ FAQ
1.How can I place an order for MAX765CPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX765CPA+ 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 MAX765CPA+ reliable?
The price and inventory of MAX765CPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX765CPA+ is usually 5 days.
3.What payment methods are accepted for MAX765CPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX765CPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX765CPA+?
MAX765CPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX765CPA+ 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 MAX765CPA+?
For technical support, including MAX765CPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX765CPA+ requirements.
6.How does Aetrix verify that MAX765CPA+ is sourced from the original manufacturer or authorized distributors?
All MAX765CPA+ 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 MAX765CPA+ meets industry standards.
7.What is the process for return or replacement of MAX765CPA+?
All MAX765CPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX765CPA+, 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 MAX765CPA+ part is unused and in its original packaging.
Return procedure for MAX765CPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX765CPA+ 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…
