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Analog Devices Inc./Maxim Integrated MAX1706EEE+
- Part No.:
- MAX1706EEE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1706EEE+.pdf
- Description:
- IC REG BOOST ADJ 550MA 16QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:105
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Product details
Overview
MAX1706EEE+ from Maxim Integrated is a high-efficiency, low-noise, synchronous step-up DC-DC converter with integrated 200mA LDO linear regulator, designed for single-cell Li-Ion or 1–3-cell NiCd/NiMH battery-powered wireless devices. It delivers up to 5.5V adjustable boost output (2.5V–5.5V) and 1.25V–5.0V LDO output, features 300kHz PWM/external-sync mode, 1µA shutdown current, and operates down to 0.7V input voltage - enabling extended runtime in digital cordless phones and handheld instruments.
For engineers reviewing the MAX1706EEE+ datasheet, MAX1706EEE+ pinout, MAX1706EEE+ application, or MAX1706EEE+ equivalent, key selection criteria include its dual-output architecture (boost + LDO), track-mode efficiency optimization (POUT = VLDO + 300mV), PFM/PWM mode switching via CLK/SEL, and QSOP-16 package compatibility with space-constrained portable RF designs.
Technical Context
The MAX1706EEE+ integrates a synchronous rectified boost converter (n-channel MOSFET switch + p-channel synchronous rectifier) and an independent low-dropout linear regulator with p-channel pass transistor. Its control architecture supports three operating modes: low-noise 300kHz PWM (CLK/SEL = high), low-quiescent-current PFM standby (CLK/SEL = low), and externally synchronized PWM (CLK/SEL driven 200–400kHz).
It implements track mode by sensing the LDO output at the TRACK pin and regulating the boost output 300mV above VLDO, reducing power loss across the LDO. The device includes dual pushbutton on/off controls (ONA/ONB), a dedicated low-battery comparator (LBP/LBN → LBO), and a 1.250V precision reference (REF) with ≤50µA sourcing capability.
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 at FB pin. |
| LDO Output Range | 1.25V to 5.0V adjustable via FBLDO divider; regulates to 1.250V at FBLDO pin. |
| Max Boost Output Current | Up to 435mA typical (PFM mode) or 550mA max (PWM mode) at VOUT = 3.3V, VIN = 2.4V. |
| LDO Output Current | Up to 200mA with dropout resistance ≤1.2Ω; stable with 22µF/≤1Ω ESR output capacitor. |
| Startup Input Voltage | Guaranteed 1.1V at +25°C; operational down to 0.7V once regulated (bootstrapped from OUT). |
| Quiescent Current | 190µA in low-power PFM mode; 1µA in shutdown mode; no external bias required. |
| Switching Frequency | 300kHz fixed PWM (CLK/SEL = high); synchronizable 200–400kHz; PFM frequency varies with load. |
Pinout & Package
MAX1706EEE+ is housed in a 16-pin QSOP package (5.3mm × 10.2mm), pin-compatible with industry-standard QSOP footprints and occupying the same PCB area as an 8-pin SOIC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LBP (Pin 1) | Low-battery comparator noninverting input | Monitors battery voltage against LBN; common-mode range 0.5V–1.5V; enables programmable low-V detection. |
| LBN (Pin 2) | Low-battery comparator inverting input | Sets threshold; 16mV hysteresis ensures clean LBO transitions during battery sag. |
| REF (Pin 3) | Precision 1.250V reference output | Bypassed with 0.33µF capacitor; sources ≤50µA; used for FB/FBLDO feedback scaling. |
| TRACK (Pin 4) | Track-mode control input | When tied to OUT, forces POUT = VLDO + 300mV - minimizing LDO power dissipation and improving system efficiency. |
| GND (Pin 5) | Analog/digital ground reference | Common return for internal circuitry; separate from PGND to reduce noise coupling into sensitive analog blocks. |
| OUT (Pin 6) | Step-up converter output / IC power rail | Supplies internal circuitry; bootstraps operation down to 0.7V input; connects to FB for regulation. |
| FB (Pin 7) | Boost output voltage feedback | Regulates to 1.233V; sets POUT via resistor divider between POUT and GND. |
| FBLDO (Pin 8) | LDO output voltage feedback | Regulates to 1.250V; sets LDO voltage via divider between LDO and GND; supports tracking. |
| LDO (Pin 9) | Linear regulator output | Delivers up to 200mA; requires 22µF/≤1Ω ESR capacitor for stability; powers noise-sensitive analog stages. |
| LBO (Pin 10) | Open-drain low-battery indicator | Active-low output; sinks current when LBP < LBN; compatible with microcontroller interrupt inputs. |
| CLK/SEL (Pin 11) | Mode selection & sync input | Selects PFM (low), PWM (high), or external clock sync (200–400kHz); also enables soft-start when pulled low at power-on. |
| PGND (Pin 12) | Power ground for n-channel switch | Separate ground path for high-current switching node (LX); minimizes noise injection into analog ground. |
| LX (Pin 13) | Switching node (inductor connection) | Connects to inductor and Schottky diode cathode; drives internal n-MOSFET and p-MOSFET synchronous rectifier. |
| ONB (Pin 14) | Off-control input | Active-high; disables device when ONB = high AND ONA = low; supports momentary pushbutton off functionality. |
| ONA (Pin 15) | On-control input | Active-high; enables device when ONA = high OR ONB = low; allows pushbutton on or processor-controlled startup. |
| POUT (Pin 16) | Boost converter power output | Main switched output; supplies LDO input and external loads; current limited to 550mA (PWM) or 435mA (PFM). |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Integrated p-channel MOSFET (270mΩ) replaces external diode, delivering ~5% higher efficiency vs. nonsynchronous designs. |
| Track mode | Automatically sets POUT = VLDO + 300mV, minimizing LDO dropout loss and extending battery life in dual-rail systems. |
| Dual shutdown control | Independent ONA (push-on) and ONB (push-off) inputs enable mechanical button interface without MCU involvement. |
| Low-noise LDO | p-Channel pass transistor eliminates base-drive current; achieves <50µV RMS output noise (10Hz–100kHz) for RF/analog circuits. |
| Ultra-low shutdown current | 1µA shutdown quiescent current preserves battery charge during long idle periods in portable instrumentation. |
Applications
| Digital Cordless Phones | Wireless Handsets |
|---|---|
Use Scenario: Powering RF power amplifier and baseband processor from single Li-Ion cell with tight ripple and noise constraints. IC Role / Device Role / Timing Role: Dual-output PMIC providing clean 3.3V LDO for analog front-end and 5.0V boost for PA bias, with track mode optimizing efficiency. Use Value: Enables >96% peak efficiency while maintaining <50µV LDO output noise - critical for meeting ACPR and adjacent-channel rejection specs. |
Use Scenario: Supplying display backlight driver and Bluetooth SoC in compact handheld form factor with minimal PCB area. IC Role / Device Role / Timing Role: High-density power solution integrating boost, LDO, low-battery monitor, and pushbutton control in one QSOP-16 package. Use Value: Reduces BOM count by eliminating discrete LDO, comparator, and enable logic; saves >25mm² board space vs. discrete implementation. |
| Palmtop Computers | Handheld Instruments |
Use Scenario: Delivering stable 3.3V and 5.0V rails to mixed-signal ADC/DAC and microcontroller under variable battery discharge profile. IC Role / Device Role / Timing Role: Adaptive power manager using PFM mode at light loads and PWM at full load to maximize runtime across usage states. Use Value: Achieves 140µA quiescent current in PFM mode and 1µA in shutdown - extending battery life beyond 100 hours in sleep state. |
Use Scenario: Powering precision op-amps and reference buffers in battery-operated multimeters and data loggers. IC Role / Device Role / Timing Role: Low-noise LDO (1.25V–5.0V adjustable) supplies analog signal chain; boost stage powers digital core and display. Use Value: PSRR >38dB up to 100kHz and <1.2mV dropout at 200mA ensure measurement accuracy unaffected by switching noise. |
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 |
|---|---|---|---|
| MAX1705EEE+ | Higher boost current limit (1000mA vs. 550mA), 1A n-channel switch, identical pinout and feature set. | Preferred where >400mA boost load is required (e.g., multi-band RF transceivers). | Select MAX1705EEE+ only if full 850mA boost capability is needed; otherwise MAX1706EEE+ offers better thermal performance at lower cost. |
| TPS61088RHLR | Single-output boost-only (no integrated LDO), 5.5V/6A capability, 2.7V–5.5V input, no track mode or dual ON control. | Requires external LDO for noise-sensitive rails; suitable for high-current digital loads but not RF/analog co-location. | Choose TPS61088RHLR only when LDO is implemented separately and >1A boost current is mandatory; lacks MAX1706EEE+'s integrated analog power management. |
Compared with MAX1705EEE+, the MAX1706EEE+ trades peak boost current for lower thermal stress and tighter PFM regulation, while the TPS61088RHLR provides higher power density but requires additional components to replicate the dual-rail, low-noise functionality of the MAX1706EEE+.
Availability
MAX1706EEE+ is available at Aetrix Electronics and suitable for digital cordless phones, wireless handsets, and handheld instruments requiring stable component supply across industrial temperature ranges (-40°C to +85°C) and long-term production continuity.
Supply support for MAX1706EEE+ 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 engineered specifically for battery-powered wireless devices needing ultra-low-noise analog power and adaptive efficiency - targeting cellular handsets, PCS phones, and portable test equipment.
FAQ
What is the guaranteed minimum input voltage for MAX1706EEE+ startup?
The MAX1706EEE+ guarantees startup from 1.1V at +25°C using its internal low-voltage oscillator. Once regulation is achieved, it continues operating down to 0.7V input due to bootstrapping from the OUT pin. This enables reliable power-up from deeply discharged NiMH or aging Li-Ion cells, making the MAX1706EEE+ well-suited for long-life portable instrumentation where battery voltage sag is common.
How does the track mode function in MAX1706EEE+ and what design benefit does it provide?
In track mode (TRACK pin tied to OUT), the MAX1706EEE+ regulates its boost output (POUT) to be exactly 300mV above the LDO output voltage (VLDO). This minimizes the voltage drop across the LDO pass transistor, reducing power dissipation and improving overall system efficiency - especially valuable in dual-rail applications like RF front-ends where both clean LDO and higher-voltage boost rails are required simultaneously.
Can MAX1706EEE+ operate with an external clock, and what is the supported synchronization range?
Yes, the MAX1706EEE+ supports external clock synchronization via the CLK/SEL pin. When driven with an external signal, it locks to frequencies between 200kHz and 400kHz. This capability allows designers to avoid interference with sensitive IF bands in wireless receivers and coordinate switching noise with other system clocks - a key advantage over fixed-frequency-only boost converters in densely packed RF modules.
What is the maximum continuous output current capability of the LDO in MAX1706EEE+?
The MAX1706EEE+ LDO delivers up to 200mA continuously, with a dropout resistance of ≤1.2Ω (at ILDO = 200mA). Stability requires a 22µF output capacitor with ≤1Ω ESR. The actual deliverable LDO current is constrained by both the boost converter's available output and the voltage differential between POUT and VLDO - for example, at VLDO = 3.3V and POUT = 3.6V, maximum LDO current is limited by (3.6V − 3.3V)/1.2Ω ≈ 250mA, but practical limits remain at 200mA per specification.
How does the dual ON/OFF control (ONA and ONB) work in MAX1706EEE+?
The MAX1706EEE+ uses ONA (pin 15) as active-high enable and ONB (pin 14) as active-high disable. The device turns on when ONA = high OR ONB = low; it turns off only when ONA = low AND ONB = high. This logic enables true pushbutton on/off functionality: a momentary switch between ONA and GND provides "push-on", while another between ONB and VCC provides "push-off" - eliminating need for microcontroller GPIO toggling or debounce firmware.
MAX1706EEE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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:
- 550mA (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
MAX1706EEE+ FAQ
1.How can I place an order for MAX1706EEE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1706EEE+ 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 MAX1706EEE+ reliable?
The price and inventory of MAX1706EEE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1706EEE+ is usually 5 days.
3.What payment methods are accepted for MAX1706EEE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1706EEE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1706EEE+?
MAX1706EEE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1706EEE+ 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 MAX1706EEE+?
For technical support, including MAX1706EEE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1706EEE+ requirements.
6.How does Aetrix verify that MAX1706EEE+ is sourced from the original manufacturer or authorized distributors?
All MAX1706EEE+ 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 MAX1706EEE+ meets industry standards.
7.What is the process for return or replacement of MAX1706EEE+?
All MAX1706EEE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1706EEE+, 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 MAX1706EEE+ part is unused and in its original packaging.
Return procedure for MAX1706EEE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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