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Analog Devices Inc./Maxim Integrated MAX764CPA+
- Part No.:
- MAX764CPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX764CPA+.pdf
- Description:
- IC REG BUCK BOOST ADJ/-1V 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,085
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Product details
Overview
MAX764CPA+ from Maxim Integrated is a high-efficiency, current-limited PFM inverting DC-DC converter with internal P-channel MOSFET, delivering up to 250mA at -5V output, operating from 3V to 16V input, and consuming only 120µA quiescent supply current. It targets low-power portable systems requiring compact, low-noise negative voltage generation.
For engineers reviewing the MAX764CPA+ datasheet, MAX764CPA+ pinout, MAX764CPA+ application, or MAX764CPA+ equivalent, key selection criteria include its fixed -5V output, 300kHz switching frequency, shutdown current <5µA, internal power switch, and compatibility with miniature 47µH surface-mount inductors.
Technical Context
The MAX764CPA+ uses a proprietary current-limited pulse-frequency modulation (PFM) control scheme that enforces a 16µs maximum on-time and 2.3µs minimum off-time while limiting peak LX current to 0.75A. This enables high efficiency (>80%) across light to heavy loads without external compensation.
It operates as an inverting regulator powered by the differential between V+ and VOUT, applying full gate drive to its internal P-channel MOSFET to minimize on-resistance. The 1.5V reference (REF) supports both fixed-output (FB tied to REF) and adjustable-output (external resistor divider) configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed -5V ±4% (no external resistors required); adjustable from -1V to -16V via FB/REF divider |
| Input Voltage Range | 3V to 16V - supports single-cell Li-ion, multi-cell alkaline, and industrial 5V/12V rails |
| Max Output Current | 250mA at V+ = 15V; derates to ~150mA at V+ = 5V per max output current vs. VIN curve |
| Supply Current (No Load) | 120µA typical - enables >1-year battery life in always-on sensor nodes |
| Shutdown Current | ≤5µA - ensures negligible drain during system sleep modes |
| Switching Frequency | Up to 300kHz - allows use of <5mm-diameter SMT inductors (e.g., 47µH) without custom magnetics |
| Peak Switch Current | 0.75A - sets inductor saturation and diode RMS current requirements |
Pinout & Package
MAX764CPA+ is housed in an 8-pin plastic DIP package (0.300" wide), RoHS-compliant and rated for 0°C to +70°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: OUT | Sense input for fixed-output mode | Must connect to VOUT node; enables internal feedback when FB tied to REF |
| 2: FB | Feedback input | Tie to REF for -5V fixed output; connect external R1/R2 divider for adjustable output |
| 3: SHDN | Active-high shutdown control | Drive ≥1.6V to enter shutdown (<5µA IQ); tie to GND for normal operation |
| 4: REF | 1.5V precision reference output | Source up to 100µA; bypass with 0.1µF capacitor close to pin |
| 5: GND | Power and signal ground | Star-ground connection point for C1, C4, and LX return path |
| 6,7: V+ | Positive supply input (dual pins) | Must be tied together; place 0.1µF bypass capacitor as close as possible |
| 8: LX | Drain of internal P-channel MOSFET | Swings from V+ (ON) to |VOUT| + diode drop (OFF); peak current limited to 0.75A |
Key Features
| Feature | Design Value |
|---|---|
| Current-limited PFM control | Combines 120µA light-load IQ of PFM with >80% heavy-load efficiency of PWM via programmable on/off timing and peak-current limiting |
| Integrated P-channel MOSFET | Eliminates external switch; reduces BOM count and layout complexity for ≤250mA inverting supplies |
| Dual-mode output configuration | Supports drop-in -5V operation (FB→REF) or precision-adjustable output (-1V to -16V) using standard 1% resistors |
| 300kHz switching frequency | Enables use of off-the-shelf 47µH SMT inductors (e.g., Coilcraft DO3316P) without custom design or EMI filtering overhead |
| Low-noise startup and transient response | Stable regulation within 2ms of enable; load-step recovery <5ms (100mA step) with minimal overshoot per typical waveforms |
Applications
| LCD Bias Generation | Portable Instrument Power |
|---|---|
Use Scenario: Generating stable -5V bias for STN/TN LCD panels in handheld meters and medical monitors. IC Role / Device Role / Timing Role: Inverting DC-DC converter providing regulated negative rail directly from main battery supply. Use Value: Enables compact, low-EMI display power with no external MOSFET or compensation network required. |
Use Scenario: Supplying isolated -5V for op-amp rails and ADC reference in battery-powered data loggers. IC Role / Device Role / Timing Role: Low-quiescent-current inverter supporting long-duration unattended operation. Use Value: Achieves >1-year runtime on two AA cells due to 120µA no-load IQ and efficient PFM operation at µA–mA loads. |
| LAN Adapter Interface | Battery-Powered Remote Sensor Node |
Use Scenario: Providing -5V for RS-232 transceivers or Ethernet PHY bias in compact LAN adapters. IC Role / Device Role / Timing Role: Compact inverting regulator meeting tight board space constraints and EMI limits. Use Value: 300kHz operation allows use of tiny 47µH SMT inductors, reducing footprint by >40% vs. 50kHz alternatives. |
Use Scenario: Powering analog front-end and RF transceiver in LoRaWAN or NB-IoT edge sensors. IC Role / Device Role / Timing Role: Shutdown-capable inverter enabling ultra-low-power sleep cycles. Use Value: <5µA shutdown current prevents battery drain during 99%+ duty-cycle sleep periods. |
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 |
|---|---|---|---|
| MAX774CPA+ | Drives external P-channel MOSFET; supports up to 5W output; requires external FET, gate driver, and compensation | Suitable for higher-current (-5V @ 500mA+) or higher-voltage (-24V) inverting supplies where MAX764CPA+ is insufficient | Select MAX774CPA+ only when output power exceeds 1.5W or when adjustable current limiting is required |
| TPS60403DBVR | Fixed -5V output; 600kHz switching; 60mA max output; 25µA IQ; no shutdown pin; SOT-23-5 package | Targeted at ultra-low-power, space-constrained applications where 60mA is sufficient and shutdown control is not needed | Choose TPS60403DBVR for sub-60mA loads where PCB area is critical and shutdown functionality is optional |
Compared with MAX774CPA+, the MAX764CPA+ offers lower component count and simpler layout for ≤250mA designs; compared with TPS60403DBVR, it delivers 4× more output current and includes active shutdown control - making it optimal for mid-power portable instrumentation.
Availability
MAX764CPA+ is available at Aetrix Electronics and suitable for LCD bias generation, portable instrumentation, and battery-powered remote sensing applications requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for MAX764CPA+ 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 MAX764CPA+ belongs to Maxim's legacy high-efficiency inverting DC-DC converter family, designed specifically for compact, low-IQ negative voltage generation in portable and battery-critical systems.
FAQ
What output voltage does the MAX764CPA+ provide?
The MAX764CPA+ provides a fixed -5V output with ±4% tolerance when configured in standard mode (FB tied to REF). It also supports adjustable output from -1V to -16V using two external resistors per the R1/R2 divider equation in the datasheet. The MAX764CPA+ does not support positive output voltages or non-inverting topologies.
Can the MAX764CPA+ operate from a 3.3V input?
Yes, the MAX764CPA+ supports input voltages from 3V to 16V, so 3.3V is within specification. However, at 3.3V input, maximum output current is reduced due to the 20V VIN–VOUT differential limit and internal switch characteristics - consult the "Maximum Output Current vs. Supply Voltage" graph to confirm usable load at -5V output.
Does the MAX764CPA+ require an external MOSFET?
No, the MAX764CPA+ integrates a P-channel power MOSFET on-die, eliminating the need for any external switching transistor. This distinguishes it from higher-power alternatives like the MAX774CPA+, which drives an external FET. The internal switch supports up to 0.75A peak current and is optimized for ≤250mA continuous output.
How does shutdown work on the MAX764CPA+?
The MAX764CPA+ features an active-high SHDN pin (Pin 3): driving it ≥1.6V places the device in shutdown mode, reducing supply current to ≤5µA and discharging the OUT node to ground. For normal operation, SHDN must be tied to GND. The pin accepts TTL/CMOS logic levels and has ±1µA leakage current.
What inductor value is recommended for the MAX764CPA+?
A 47µH surface-mount inductor is recommended for most MAX764CPA+ applications, as validated in Maxim's typical operating circuits. Inductors should have ≤100mΩ DC resistance, ferrite core construction, and ≥0.75A saturation current rating. Common compatible parts include Coilcraft DO3316P-473 and Sumida CD75-470.
MAX764CPA+ 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 (-5V)
- Voltage - Output (Max):
- -16V
- Current - Output:
- 260mA
- Frequency - Switching:
- 300kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX764CPA+ FAQ
1.How can I place an order for MAX764CPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX764CPA+ 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 MAX764CPA+ reliable?
The price and inventory of MAX764CPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX764CPA+ is usually 5 days.
3.What payment methods are accepted for MAX764CPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX764CPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX764CPA+?
MAX764CPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX764CPA+ 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 MAX764CPA+?
For technical support, including MAX764CPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX764CPA+ requirements.
6.How does Aetrix verify that MAX764CPA+ is sourced from the original manufacturer or authorized distributors?
All MAX764CPA+ 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 MAX764CPA+ meets industry standards.
7.What is the process for return or replacement of MAX764CPA+?
All MAX764CPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX764CPA+, 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 MAX764CPA+ part is unused and in its original packaging.
Return procedure for MAX764CPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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