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Analog Devices Inc./Maxim Integrated MAX768EEE-TG074
- Part No.:
- MAX768EEE-TG074
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX768EEE-TG074.pdf
- Description:
- IC REG CHG PUMP ADJ/5V DL 16QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:15,167
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Product details
Overview
The MAX768EEE-TG074 from Maxim Integrated is a low-noise, dual-output regulated charge pump IC designed to generate ±5V outputs from a 2.5V–5.5V input for GaAsFET biasing and VCO powering in wireless handsets. It integrates a voltage-doubler followed by an inverting charge pump and two CMOS LDO regulators, delivering ≥5mA per output with <2mVp-p ripple and independent shutdown controls.
For engineers reviewing the MAX768EEE-TG074 datasheet, MAX768EEE-TG074 pinout, MAX768EEE-TG074 application, or MAX768EEE-TG074 equivalent, key selection criteria include its dual-mode ±5V fixed/adjustable regulation, 25kHz/100kHz internal switching frequencies (or external sync up to 240kHz), RDY output-ready indicator for GaAsFET protection, and 16-pin QSOP package compatibility with space-constrained RF front-end designs.
Technical Context
The MAX768EEE-TG074 implements a two-stage switched-capacitor architecture: first a voltage doubler (C1± → V+) generating ~2×VIN, then an inverter stage (C2± → V−) producing ~−2×VIN, both feeding independent CMOS-based LDO regulators. Its Dual Mode™ operation supports factory-set ±5V outputs or resistor-divider-adjustable voltages using internal ±1.25V references.
It features two active-low TTL-compatible shutdown inputs (PSHDN/NSHDN) enabling independent control of positive/negative regulator sections, plus an open-drain RDY signal that asserts when NOUT reaches within 10% of its regulation setpoint - critical for sequencing GaAsFET power amplifier enablement.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 5.5V - supports direct operation from single Li+ or 3-cell NiMH/NiCd batteries. |
| Output Voltage (Fixed Mode) | ±5V - preset via SETP/SETN tied to GND; enables immediate use without external resistors. |
| Output Current (Each Rail) | ≥5mA - guaranteed minimum load capability per regulated output under full temperature range. |
| Output Ripple | <2mVp-p - achieved via LDO post-regulation of charge-pump outputs, essential for low-noise VCO/LCD biasing. |
| Switching Frequency Options | 25kHz (SYNC = GND), 100kHz (SYNC = IN), or 20–240kHz external sync - allows noise/capacitor-size/quiescent-current trade-offs. |
| Shutdown Supply Current | ≤10µA - achieved when both PSHDN and NSHDN are low, enabling ultra-low-power system sleep modes. |
| Operating Temperature Range | −40°C to +85°C - qualified for industrial and wireless handset environmental conditions. |
Pinout & Package
The MAX768EEE-TG074 is housed in a 16-pin QSOP package (5.84mm × 3.81mm × 1.40mm body height), pin-compatible with standard 8-pin SO footprints despite doubled pin count - enabling high-density RF board layouts without increasing PCB area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 C1− | Negative terminal of doubler charge-pump capacitor | Connects to C1− capacitor; forms first stage (2×VIN) reservoir node with C1+ and V+. |
| 2 GND | Ground reference | Primary return path for all regulators, charge pumps, and logic; requires solid ground plane for low-noise operation. |
| 3 C2− | Negative terminal of inverter charge-pump capacitor | Connects to C2− capacitor; completes second stage (−2×VIN) generation with C2+ and V−. |
| 4 V− | Inverter charge-pump output | Intermediate −2×VIN rail feeding negative LDO; must be decoupled with C4/C6 for stability. |
| 5 NOUT | Negative regulated output | Final −5V (or adjustable) output; supplies GaAsFET gate bias or tuner diode; monitored by RDY. |
| 6 SETN | Negative output voltage setting input | Tied to GND for −5V; connected to resistor divider (NOUT–SETN–GND) for custom negative voltage. |
| 7 NSHDN | Negative supply shutdown input | Active-low control disabling inverter pump, negative LDO, and RDY signal - enables partial power-down. |
| 8 PSHDN | Positive supply shutdown input | Active-low control disabling positive LDO only; doubler pump remains active for faster wake-up. |
| 9 SYNC | External clock synchronizing input | Accepts 20–240kHz square wave (40–60% duty cycle); overrides internal oscillator for EMI management. |
| 10 RDY | Output-ready indicator | Open-drain signal pulled low when |VNOUT| ≥90% of regulation target - used to safely enable GaAsFET PA. |
| 11 SETP | Positive output voltage setting input | Tied to GND for +5V; connected to resistor divider (POUT–SETP–GND) for custom positive voltage. |
| 12 POUT | Positive regulated output | Final +5V (or adjustable) output; powers VCOs, LCD segments, or other analog circuitry requiring clean bias. |
| 13 V+ | Doubler charge-pump output | Intermediate +2×VIN rail feeding positive LDO; must be decoupled with C3/C5 for stability. |
| 14 C1+ | Positive terminal of doubler charge-pump capacitor | Connects to C1+ capacitor; forms first stage (2×VIN) reservoir node with C1− and V+. |
| 15 IN | Main supply input | 2.5V–5.5V input; requires 4.7µF bypass capacitor to GND close to pin for transient response. |
| 16 C2+ | Positive terminal of inverter charge-pump capacitor | Connects to C2+ capacitor; completes second stage (−2×VIN) generation with C2− and V−. |
Key Features
| Feature | Design Value |
|---|---|
| Dual regulated ±5V outputs | Simultaneous low-noise positive and negative rails from single input - eliminates need for separate inverters or transformers in RF front-ends. |
| Output-ready (RDY) indicator | Open-drain logic signal confirms NOUT has stabilized within 10% of target - prevents premature GaAsFET turn-on and device damage. |
| Independent shutdown controls | PSHDN and NSHDN allow selective disable of positive/negative sections - reduces quiescent current to ≤0.1µA per section during idle states. |
| Dual Mode™ voltage setting | Factory preset ±5V (SETP/SETN = GND) or resistor-divider-adjustable outputs using ±1.25V internal references - simplifies design flexibility without external DACs. |
| Synchronizable switching frequency | 20–240kHz external clock input enables EMI spread-spectrum alignment and avoids sensitive IF bands in wireless receivers. |
| CMOS LDO architecture | Zero-load dropout voltage and load-independent quiescent current - maintains efficiency and regulation across full 0–5mA output range. |
Applications
| GaAsFET Power Amplifier Bias | Voltage-Controlled Oscillator (VCO) Supply |
|---|---|
|
Use Scenario: Providing stable negative gate bias to GaAsFET power amplifiers in cellular/PCS handset RF power stages. IC Role / Device Role / Timing Role: Generates precisely regulated −5V rail with RDY confirmation before PA enablement. Use Value: Prevents catastrophic GaAsFET failure during power-up by ensuring NOUT reaches regulation before gate drive activation. |
Use Scenario: Supplying low-noise +5V to VCOs in wireless transceivers where phase noise directly impacts receiver sensitivity. IC Role / Device Role / Timing Role: Delivers ultra-low-ripple positive output (<2mVp-p) to minimize VCO phase jitter. Use Value: Improves signal-to-noise ratio by reducing supply-induced VCO frequency modulation, enhancing adjacent-channel rejection. |
| Tuner Diode Power Supply | Positive and Negative LCD Supply |
|
Use Scenario: Generating variable tuning voltage for varactor diodes in RF front-end tuners across multiple frequency bands. IC Role / Device Role / Timing Role: Provides adjustable negative output via SETN resistor divider for precise diode reverse-bias control. Use Value: Enables wide-range capacitance tuning (e.g., 2–30pF) with stable DC bias, supporting multi-band antenna matching. |
Use Scenario: Powering segment drivers and contrast control in monochrome or color STN/TN LCD modules in handheld devices. IC Role / Device Role / Timing Role: Supplies matched ±5V rails to LCD controller ICs requiring symmetrical bias for optimal contrast and viewing angle. Use Value: Eliminates need for discrete charge pumps or transformer-based supplies, reducing BOM cost and board area by >40%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output regulated charge pump applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX680ESA+ | Single-output ±5V inverter; no independent shutdown, no RDY output, no adjustable mode; 12-pin SO package. | Lacks GaAsFET sequencing support and partial shutdown - suitable only for basic dual-rail needs without safety-critical timing. | Select when cost and simplicity outweigh sequenced enablement and rail independence requirements. |
| LT3467EDD | Dual-output DC/DC converter (not charge pump); higher efficiency at >10mA; requires inductors; 10-pin DFN package. | Better suited for higher-current loads (>10mA) but adds magnetic components and EMI filtering complexity. | Select when output current exceeds 5mA or when inductor-based solutions are acceptable for improved thermal performance. |
Compared with MAX680ESA+ and LT3467EDD, the MAX768EEE-TG074 uniquely combines GaAsFET-safe RDY signaling, independent rail shutdown, and capacitor-only implementation - making it the only choice for compact, low-noise, sequenced dual-rail biasing in battery-powered RF handsets.
Availability
The MAX768EEE-TG074 is available at Aetrix Electronics and suitable for wireless handset RF front-ends, portable LCD displays, and VCO-tuned receiver modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX768EEE-TG074 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 MAX768EEE-TG074 belongs to Maxim's regulated charge pump product line, engineered specifically for low-noise, dual-polarity bias generation in RF power amplifier and frequency synthesis subsystems of portable wireless devices.
FAQ
What is the operating temperature range specified for the MAX768EEE-TG074?
The MAX768EEE-TG074 is rated for operation from −40°C to +85°C, as confirmed in the Ordering Information table and Absolute Maximum Ratings section. This industrial-grade temperature range ensures reliable performance in wireless handsets and portable RF equipment exposed to ambient thermal variations. All electrical characteristics - including output voltage accuracy, load regulation, and RDY threshold - are guaranteed across this full range.
How does the RDY output function in the MAX768EEE-TG074, and what is its design purpose?
The RDY output in the MAX768EEE-TG074 is an open-drain signal that pulls low when the negative output voltage (NOUT) rises to within 10% of its regulation setpoint - for example, when VNOUT reaches −4.5V on a −5V rail. Its primary design purpose is to protect GaAsFET power amplifiers by preventing gate drive activation until stable negative bias is established. This sequencing safeguard is explicitly documented in the General Description and Pin Description sections.
Can the MAX768EEE-TG074 generate output voltages other than ±5V, and if so, how is adjustment implemented?
Yes, the MAX768EEE-TG074 supports adjustable outputs via its Dual Mode™ architecture. Connecting SETP or SETN to GND yields fixed +5V or −5V. To adjust, connect SETP between POUT and GND via a resistor divider (R1/R2), or SETN between NOUT and GND (R3/R4). The internal ±1.25V references enable calculation of VPOUT = 1.25(1 + R2/R1) and VNOUT = −1.25(1 + R4/R3), as shown in Figure 3 and Applications Information.
What external components are required for basic operation of the MAX768EEE-TG074?
The MAX768EEE-TG074 requires seven external capacitors: two for the doubler stage (C1±), two for the inverter stage (C2±), and three for output filtering (C3, C4, C5/C6). Typical values are 10µF ceramic for C1/C2 and 4.7µF–10µF for outputs, as specified in Table 2 and Figure 2. A 4.7µF input bypass capacitor on IN is also mandatory. No inductors or diodes are needed - confirming its capacitor-only charge-pump topology.
Does the MAX768EEE-TG074 support synchronization to an external clock, and what are the valid frequency and duty-cycle constraints?
Yes, the MAX768EEE-TG074 supports external clock synchronization via the SYNC pin. Valid input frequencies span 20kHz to 240kHz, and the clock must maintain a 40% to 60% duty cycle, as stated in the Electrical Characteristics table and Detailed Description. When SYNC is tied to GND, the internal oscillator runs at 25kHz; when tied to IN, it operates at 100kHz - providing three distinct frequency options for EMI optimization.
MAX768EEE-TG074 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive and Negative (Dual Rail)
- Topology:
- Charge Pump
- Output Type:
- Adjustable (Fixed)
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 2.5V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- ±1.25V (±5V)
- Voltage - Output (Max):
- ±11V
- Current - Output:
- 5mA
- Frequency - Switching:
- 25kHz, 100kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QSOP
MAX768EEE-TG074 FAQ
1.How can I place an order for MAX768EEE-TG074 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX768EEE-TG074 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 MAX768EEE-TG074 reliable?
The price and inventory of MAX768EEE-TG074 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX768EEE-TG074 is usually 5 days.
3.What payment methods are accepted for MAX768EEE-TG074?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX768EEE-TG074 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX768EEE-TG074?
MAX768EEE-TG074 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX768EEE-TG074 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 MAX768EEE-TG074?
For technical support, including MAX768EEE-TG074 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX768EEE-TG074 requirements.
6.How does Aetrix verify that MAX768EEE-TG074 is sourced from the original manufacturer or authorized distributors?
All MAX768EEE-TG074 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 MAX768EEE-TG074 meets industry standards.
7.What is the process for return or replacement of MAX768EEE-TG074?
All MAX768EEE-TG074 units undergo pre-shipment inspection (PSI). If there is an issue with MAX768EEE-TG074, 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 MAX768EEE-TG074 part is unused and in its original packaging.
Return procedure for MAX768EEE-TG074:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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