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Analog Devices Inc./Maxim Integrated MAX1705EEE+T
- Part No.:
- MAX1705EEE+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1705EEE+T.pdf
- Description:
- IC REG BOOST ADJ 1A 16QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,933
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Product details
Overview
MAX1705EEE+T from Maxim Integrated is a high-efficiency, low-noise, synchronous step-up DC-DC converter with integrated 200mA LDO linear regulator and 1A n-channel MOSFET switch. It generates adjustable 2.5V–5.5V boost output from 1–3 NiCd/NiMH or 1 Li-Ion cell (0.7V–3.6V input), supports PWM/PFM mode selection via CLK/SEL, and delivers up to 850mA at 3.3V in PWM mode for RF power amplifiers and analog signal chains in portable wireless devices.
For engineers reviewing the MAX1705EEE+T datasheet, MAX1705EEE+T pinout, MAX1705EEE+T application, or MAX1705EEE+T equivalent, key selection criteria include guaranteed 1.1V startup, track-mode efficiency optimization (VPOUT = VLDO + 300mV), 1µA shutdown current, and dual pushbutton/microprocessor ON/OFF control via ONA/ONB pins.
Technical Context
The MAX1705EEE+T integrates a synchronous rectified PWM/PFM boost controller with an internal 1A n-channel switch and 270mΩ p-channel synchronous rectifier, enabling up to 96% efficiency and 5% gain over nonsynchronous topologies. Its dual-mode operation-300kHz fixed-frequency PWM for low-noise full-power delivery and variable-frequency PFM for ultra-low-quiescent standby-supports dynamic load adaptation in battery-constrained systems.
It features a dedicated track-mode control (TRACK pin) that dynamically sets the boost output 300mV above the LDO output voltage, minimizing dropout loss across the linear regulator. The built-in uncommitted low-battery comparator (LBP/LBN/LBO) and dual ON/OFF inputs (ONA/ONB) provide system-level power sequencing and battery monitoring without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Boost Output Range | 2.5V to 5.5V adjustable via FB resistor divider; regulates to 1.233V reference for precise setpoint control. |
| LDO Output Range | 1.25V to 5.0V adjustable via FBLDO divider; regulates to 1.250V reference with ±1.25% line/load regulation. |
| Max Boost Output Current | 850mA at 3.3V (PWM mode, VIN ≥ 2.4V); limited by 1.28A n-MOSFET current limit and thermal design. |
| Startup Input Voltage | Guaranteed 1.1V at +25°C; operates down to 0.7V once regulated-enables deep-discharge battery utilization. |
| Shutdown Quiescent Current | 1µA max; reduces system standby power to sub-microwatt level for extended battery life. |
| Switching Frequency | 300kHz PWM mode (±40kHz tolerance); synchronizable to 200–400kHz external clock to avoid RF interference bands. |
| LDO Dropout Resistance | 0.5Ω typical (p-channel MOSFET pass device); enables <100mV dropout at 200mA, improving efficiency vs. bipolar LDOs. |
Pinout & Package
MAX1705EEE+T is housed in a 16-pin QSOP package (5.3mm × 10.2mm), pin-compatible with industry-standard 16-pin SOIC footprints but with reduced height for space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LBP (Pin 1) | Low-battery comparator noninverting input | Accepts battery voltage reference (0.5V–1.5V common-mode range); triggers LBO when VLBP < VLBN. |
| LBN (Pin 2) | Low-battery comparator inverting input | Sets threshold for low-battery detection; 16mV hysteresis prevents chatter during voltage sag. |
| REF (Pin 3) | 1.250V precision reference output | Stable 1.250V ±1.25% source for external circuitry; capable of sourcing up to 50µA. |
| TRACK (Pin 4) | Track-mode control input | When tied to OUT, forces VPOUT = VLDO + 300mV-reducing LDO dropout loss and improving overall efficiency. |
| GND (Pin 5) | Analog and digital ground reference | Common return for feedback, control, and LDO circuits; must be connected to low-impedance PCB ground plane. |
| OUT (Pin 6) | IC power supply and LDO input | Supplies internal circuitry and feeds LDO input; bypass with 0.1µF ceramic capacitor placed adjacent to IC. |
| FB (Pin 7) | Boost converter feedback input | Regulates POUT to 1.233V; connects to resistor divider between POUT and GND for output voltage programming. |
| FBLDO (Pin 8) | LDO feedback input | Regulates LDO to 1.250V; connects to resistor divider between LDO and GND for LDO output programming. |
| LDO (Pin 9) | LDO linear regulator output | Delivers up to 200mA with <100mV dropout at full load; requires 22µF/≤1Ω ESR output capacitor for stability. |
| LBO (Pin 10) | Low-battery open-drain output | N-channel open-drain flag; pulls low when battery voltage falls below LBN threshold-connects to µC interrupt or LED. |
| CLK/SEL (Pin 11) | Mode selection and sync input | Logic-high = PWM (300kHz); logic-low = PFM (variable frequency); driven externally = synchronized PWM (200–400kHz). |
| PGND (Pin 12) | Power ground for n-MOSFET source | Separate ground return for high-current switching path; must be routed with low-inductance copper to minimize noise. |
| LX (Pin 13) | Inductor switch node | Connects to inductor and Schottky diode anode; drives internal n-MOSFET and p-synchronous rectifier. |
| ONB (Pin 14) | Off-control input | Active-high shutdown control; when ONB = high AND ONA = low, device enters 1µA shutdown state. |
| ONA (Pin 15) | On-control input | Active-high enable; when ONA = high OR ONB = low, device powers up-supports push-on/push-off button interface. |
| POUT (Pin 16) | Boost converter power output | Main switched output (2.5V–5.5V); supplies LDO input and external loads; current shared with LDO draw. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Integrated 270mΩ p-channel rectifier improves efficiency by 5% vs. diode-based boost converters-extending battery runtime. |
| Track-mode voltage coordination | VPOUT automatically tracks VLDO + 300mV, minimizing LDO dropout loss and reducing total system power dissipation. |
| Dual ON/OFF control logic | Independent ONA (active-high) and ONB (active-high) inputs enable flexible power sequencing-e.g., momentary button + microcontroller control. |
| Low-voltage startup oscillator | Guaranteed 1.1V startup at +25°C enables operation from deeply discharged batteries before main regulator engages. |
| Uncommitted low-battery comparator | Configurable LBP/LBN inputs with 16mV hysteresis allow custom battery threshold setting without external comparators or resistors. |
| 1µA shutdown current | Ultra-low quiescent state preserves battery capacity during long idle periods-critical for always-on portable instrumentation. |
Applications
| Cellular Handset Power Management | Wireless Data Terminal Supply |
|---|---|
|
Use Scenario: Dual-rail power for GSM/PCS handset: 3.3V for baseband processor and 2.8V for RF PA, with tight noise requirements on analog sections. IC Role / Device Role / Timing Role: MAX1705EEE+T provides synchronized 3.3V boost output (PWM mode) and clean 2.8V LDO output (track mode), decoupling noisy switching from sensitive RF/analog blocks. Use Value: 96% peak efficiency and <50µVRMS LDO output noise ensure RF signal integrity and extend talk time per charge cycle. |
Use Scenario: Portable barcode scanner with LCD backlight, CMOS imager, and Bluetooth radio-all powered from single Li-Ion cell. IC Role / Device Role / Timing Role: MAX1705EEE+T delivers 5.0V for backlight (boost), 3.3V for MCU/radio (LDO), and monitors battery health via LBO flag during active scanning. Use Value: 1.1V startup allows full functionality until battery reaches 2.8V, while 1µA shutdown extends shelf life beyond 12 months. |
| Palmtop Computer Core Logic | Handheld Test Instrument |
|
Use Scenario: Low-power PDA requiring 3.3V core voltage and 2.5V I/O rail from 2-cell NiMH pack with aggressive battery-life targets. IC Role / Device Role / Timing Role: MAX1705EEE+T operates in PFM mode during idle (140µA quiescent), switches to PWM only during CPU bursts-dynamically matching load demand. Use Value: Discontinuous inductor current in PFM mode reduces light-load losses, achieving >85% efficiency at 1mA load-doubling standby duration. |
Use Scenario: Battery-powered oscilloscope front-end needing ultra-low-noise 2.5V analog supply and stable 5.0V digital rail. IC Role / Device Role / Timing Role: MAX1705EEE+T uses track mode to set VPOUT = 2.8V, feeding a low-noise LDO that powers ADC reference and op-amp stages. Use Value: Linear-regulator PSRR >60dB @ 100kHz and <10µVRMS output noise preserve measurement accuracy and dynamic range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up DC-DC converter with integrated LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1706EEE+T | 0.5A n-MOSFET switch (vs. 1A), lower max output current (435mA at 3.3V), same pinout and feature set. | Targeted at lower-power handhelds where 850mA peak is unnecessary-reduces cost and thermal load. | Select MAX1706EEE+T when system peak load ≤400mA and board layout must remain identical. |
| TPS61088RHLR | Higher 5.5A switch, 2.7V–12V input, no integrated LDO-requires external LDO for noise-sensitive rails. | Used in higher-input-voltage applications (e.g., 2S Li-ion packs) where integrated LDO is not required or handled separately. | Choose TPS61088RHLR for >3.6V input or when discrete LDO selection is preferred for performance tuning. |
Compared with MAX1706EEE+T, the MAX1705EEE+T provides 2× higher boost current capability and identical track-mode efficiency optimization; compared with TPS61088RHLR, it offers integrated LDO and guaranteed 1.1V startup-making it optimal for single-cell, noise-critical, ultra-low-voltage portable systems.
Availability
MAX1705EEE+T is available at Aetrix Electronics and suitable for cellular handsets, wireless data terminals, palmtop computers, and handheld test instruments requiring stable component supply across extended production lifecycles.
Supply support for MAX1705EEE+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 portable, industrial, and communications applications.
The MAX1705/MAX1706 product line was designed specifically for battery-powered wireless instruments requiring simultaneous high-efficiency power conversion and ultra-low-noise analog supply-targeting cellular phones, PCS handsets, and handheld data acquisition systems.
FAQ
What is the minimum input voltage required to start up the MAX1705EEE+T?
The MAX1705EEE+T guarantees startup at 1.1V input voltage at +25°C using its dedicated low-voltage oscillator. Once regulation is achieved, it continues operating down to 0.7V input-enabling full functionality from deeply discharged single-cell Li-Ion or multi-cell NiMH batteries. This behavior is confirmed in the Electrical Characteristics table and Typical Operating Characteristics (TOC07).
How does the TRACK pin improve system efficiency in the MAX1705EEE+T?
When the TRACK pin is connected to the OUT pin, the MAX1705EEE+T configures the boost converter to regulate its output (POUT) precisely 300mV above the LDO output voltage (VLDO). This minimizes the voltage drop across the LDO's p-channel pass transistor, reducing conduction loss and heat generation-especially critical under high LDO load currents.
Can the MAX1705EEE+T operate without an external Schottky diode?
No-the MAX1705EEE+T requires an external Schottky diode connected from LX to POUT. Although it includes an internal p-channel synchronous rectifier, this device only replaces the freewheeling diode during the off-phase of the switching cycle; the external diode remains necessary for proper current path control and reliability under all operating conditions per the Typical Operating Circuit (Figure 2).
What is the maximum continuous output current the LDO section of the MAX1705EEE+T can deliver?
The LDO section of the MAX1705EEE+T is rated for up to 200mA continuous output current. However, actual deliverable current depends on the voltage differential between POUT and LDO, thermal limits, and the boost converter's ability to supply both LDO input and external POUT loads simultaneously-verified in the "Maximum Output Current vs. Input Voltage" graphs (TOC03/TOC06).
How does the MAX1705EEE+T handle power sequencing between the boost converter and LDO outputs?
At initial power-up, the MAX1705EEE+T enables the LDO only after the boost converter (POUT) reaches regulation-preventing premature LDO activation. However, if input voltage is applied while the device is held in shutdown, the LDO may briefly turn on before POUT stabilizes; to prevent this, hold ONA/ONB inactive until POUT is ready, as specified in the Detailed Description section.
MAX1705EEE+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 0.9V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 1A (Switch)
- Frequency - Switching:
- 260kHz ~ 340kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QSOP
MAX1705EEE+T FAQ
1.How can I place an order for MAX1705EEE+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1705EEE+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 MAX1705EEE+T reliable?
The price and inventory of MAX1705EEE+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1705EEE+T is usually 5 days.
3.What payment methods are accepted for MAX1705EEE+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1705EEE+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1705EEE+T?
MAX1705EEE+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1705EEE+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 MAX1705EEE+T?
For technical support, including MAX1705EEE+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1705EEE+T requirements.
6.How does Aetrix verify that MAX1705EEE+T is sourced from the original manufacturer or authorized distributors?
All MAX1705EEE+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 MAX1705EEE+T meets industry standards.
7.What is the process for return or replacement of MAX1705EEE+T?
All MAX1705EEE+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1705EEE+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 MAX1705EEE+T part is unused and in its original packaging.
Return procedure for MAX1705EEE+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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