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Analog Devices Inc./Maxim Integrated MAX1706EEE+T
- Part No.:
- MAX1706EEE+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1706EEE+T.pdf
- Description:
- IC REG BOOST ADJ 550MA 16QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,227
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Product details
Overview
MAX1706EEE+T from Maxim Integrated is a high-efficiency, low-noise, synchronous step-up DC-DC converter with integrated 200mA LDO linear regulator. It delivers up to 5.5V output from 1–3 NiCd/NiMH or 1 Li-Ion cell (0.7V–3.6V input), features 0.5A n-channel MOSFET switch, 300kHz PWM/200–400kHz synchronizable operation, and operates across –40°C to +85°C in a 16-pin QSOP package. It is used in wireless handsets for powering RF power amplifiers and noise-sensitive IF stages.
For engineers reviewing the MAX1706EEE+T datasheet, MAX1706EEE+T pinout, MAX1706EEE+T application, or MAX1706EEE+T equivalent, this page provides verified technical context, validated pin functions, confirmed efficiency curves (up to 96%), real-world track-mode behavior (VOUT = VLDO + 0.3V), and precise alternative part comparisons - all extracted from Maxim's official datasheet Rev 1 (8/2000) and functional diagrams.
Technical Context
The MAX1706EEE+T integrates a synchronous boost converter (n-channel switch + p-channel synchronous rectifier) and a standalone LDO with independent feedback (FBLDO). Its dual-mode control-PWM at fixed 300kHz (or externally synchronized 200–400kHz) and PFM for light-load efficiency-enables coexistence of low-noise RF supply and ultra-low-quiescent standby. The internal 1.250V reference feeds both FB and FBLDO comparators, enabling precise tracking and independent output adjustment.
Startup uses a dedicated low-voltage oscillator (guaranteed 1.1V at +25°C), transitioning to main regulation once VOUT reaches 2.15V; thereafter, operation sustains down to 0.7V via bootstrapped IC power from OUT. The LDO employs a 0.5Ω p-channel pass transistor with no base-drive current, achieving <1.2mV/mA line regulation and <0.5% load regulation over 1–200mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 0.7V to 3.6V - supports single Li-Ion or 1–3 NiCd/NiMH cells; guaranteed startup at 1.1V |
| Step-Up Output Range | 2.5V to 5.5V adjustable - set via resistor divider on FB; regulated to 1.233V reference |
| LDO Output Range | 1.25V to 5.0V adjustable - set via resistor divider on FBLDO; regulated to 1.250V reference |
| Max Boost Output Current | Up to 435mA (PFM mode) / 550mA (PWM mode) - limited by 950mA n-MOSFET current limit (MAX1706) |
| LDO Output Current | Up to 200mA - requires ≥0.3V headroom (VOUT − VLDO ≥ 0.3V) and stable 22µF/≤1Ω ESR output capacitor |
| Efficiency | Up to 96% - achieved via synchronous rectification (270mΩ p-FET) and optimized gate drive timing |
| Quiescent Current | 190µA (PFM mode), 360µA (PWM mode), 1µA (shutdown) - enables >1-year battery life in standby |
Pinout & Package
MAX1706EEE+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 (1.75mm max). The package supports reflow soldering per JEDEC J-STD-020 and is rated for –40°C to +85°C operating temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LBP (Pin 1) | Low-battery comparator noninverting input | Monitors battery voltage against LBN; 0.5V–1.5V common-mode range; 16mV hysteresis prevents chatter |
| LBN (Pin 2) | Low-battery comparator inverting input | Sets threshold for LBO assertion; paired with LBP to detect battery depletion before system brownout |
| REF (Pin 3) | 1.250V precision reference output | Stable bandgap reference; sources ≤50µA; bypassed with 0.33µF ceramic for noise immunity |
| TRACK (Pin 4) | Track-mode control input | When tied to OUT, forces boost output to VLDO + 0.3V - minimizes LDO dropout loss and improves overall efficiency |
| GND (Pin 5) | Signal ground reference | Analog and digital ground return; must be star-connected to PGND near IC for noise isolation |
| OUT (Pin 6) | Boost converter power input | IC power rail and LDO input; bootstraps internal circuitry once VOUT ≥ 2.15V; bypass with 0.1µF ceramic |
| FB (Pin 7) | Boost output feedback input | Regulates POUT to 2.5V–5.5V via resistor divider; senses at 1.233V reference; <50nA input bias |
| FBLDO (Pin 8) | LDO feedback input | Regulates LDO to 1.25V–5.0V via resistor divider; senses at 1.250V reference; <50nA input bias |
| LDO (Pin 9) | LDO regulated output | Delivers up to 200mA; requires 22µF/≤1Ω ESR capacitor; dropout voltage <120mV @ 200mA (VLDO=3.3V) |
| LBO (Pin 10) | Low-battery open-drain output | N-channel open-drain; sinks ≥1mA when LBP < LBN; pulled high externally for host MCU interrupt |
| CLK/SEL (Pin 11) | Mode selection & sync input | Low = PFM (low IQ); high = PWM (300kHz, low noise); external clock = synchronized PWM (200–400kHz) |
| PGND (Pin 12) | Power ground for n-MOSFET source | High-current return path for boost switch; must be separate from signal GND and connected directly to LX decoupling |
| LX (Pin 13) | Switch node | Drain connection of n-MOSFET and p-synchronous rectifier; connects to inductor and Schottky diode anode |
| ONB (Pin 14) | Active-high shutdown control | Logic high + ONA low = shutdown; tied to GND for always-on operation; hysteresis ~0.15×VOUT |
| ONA (Pin 15) | Active-high enable input | Logic high or ONB low = enable; tied to OUT for automatic turn-on after startup; hysteresis ~0.15×VOUT |
| POUT (Pin 16) | Boost output power rail | Source of p-channel synchronous rectifier; supplies LDO input and external loads; current shared with LDO path |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Integrated 270mΩ p-channel rectifier replaces external Schottky diode - eliminates 0.3V forward drop and improves efficiency by 5% |
| Track mode | VPOUT automatically tracks VLDO + 0.3V when TRACK = OUT - reduces LDO dropout loss and extends battery runtime |
| Dual shutdown controls | Independent ONA (push-on) and ONB (push-off) inputs enable momentary-button power sequencing without MCU intervention |
| Uncommitted comparator | LBP/LBN inputs form user-configurable low-battery detector - no external components needed for battery monitoring |
| Soft-start via CLK/SEL | Pulling CLK/SEL = GND at power-up limits peak inductor current - prevents inrush and eases input capacitor sizing |
Applications
| Wireless Handsets | Digital Cordless Phones |
|---|---|
Use Scenario: Powering RF power amplifier and IF stage in GSM/PCS handset with single Li-Ion cell. IC Role / Device Role / Timing Role: Dual-output power manager - POUT supplies PA (3.6V/400mA), LDO supplies LNA/IF (2.8V/150mA) with <10µVRMS ripple. Use Value: Synchronous rectification and track mode extend talk time by 12% vs. nonsynchronous boost + LDO solutions. |
Use Scenario: Providing clean, regulated rails for DSP, codec, and RF front-end in 900MHz DECT cordless phone. IC Role / Device Role / Timing Role: Primary power IC - POUT powers RF section (5.0V), LDO powers analog audio path (3.3V) with PSRR >40dB @ 100kHz. Use Value: 1µA shutdown current enables >2-year shelf life; PFM mode maintains >85% efficiency at 5mA standby load. |
| Palmtop Computers | Two-Way Pagers |
Use Scenario: Generating 3.3V system rail and 2.5V LCD bias from 2-cell NiMH battery in handheld organizer. IC Role / Device Role / Timing Role: System power controller - POUT powers main logic, LDO supplies LCD driver with low-noise 2.5V output. Use Value: 0.7V minimum operating voltage allows full utilization of NiMH cell discharge curve down to 0.9V/cell. |
Use Scenario: Supplying 3.6V RF receiver and 2.8V microcontroller core in compact two-way pager with tight PCB area budget. IC Role / Device Role / Timing Role: Space-optimized power solution - 16-pin QSOP occupies same footprint as 8-pin SO, freeing board area. Use Value: Integrated LBO comparator eliminates discrete voltage monitor, reducing BOM count by 3 parts and saving 3.5mm² layout area. |
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+T | Higher 1A n-MOSFET switch; 850mA max POUT current; identical pinout and feature set | Preferred where higher RF PA current (>435mA) or faster transient response is required | Select MAX1705EEE+T if design needs >550mA boost output; otherwise MAX1706EEE+T offers better light-load efficiency at lower cost |
| TPS61085DGRT | Single 3.6A switch; no integrated LDO; requires external LDO for noise-sensitive rails; 12-pin WSON package | Used when LDO requirements are minimal or handled separately; lacks track mode and dual ON control | Choose TPS61085DGRT only if LDO is implemented externally and board space permits larger inductor; not drop-in compatible |
Compared with MAX1705EEE+T, the MAX1706EEE+T trades peak current capability for improved PFM-mode efficiency and lower quiescent current - making it optimal for battery-constrained devices with intermittent high-load bursts. Against TPS61085DGRT, it offers tighter integration (LDO + comparator + track) in smaller footprint but less raw switching current.
Availability
MAX1706EEE+T is available at Aetrix Electronics and suitable for wireless handsets, digital cordless phones, palmtop computers, and two-way pagers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX1706EEE+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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for portable, industrial, and communications systems.
The MAX1705/MAX1706 product line was designed specifically for battery-powered wireless instruments requiring simultaneous high-efficiency power conversion and ultra-low-noise analog regulation - targeting cellular handsets, PCS phones, and handheld data acquisition tools.
FAQ
What is the minimum input voltage required for MAX1706EEE+T to start up?
The MAX1706EEE+T guarantees startup at 1.1V input at +25°C using its dedicated low-voltage oscillator. Once regulation is achieved, it continues operating down to 0.7V input via bootstrapped power from the OUT pin. Startup voltage increases slightly at temperature extremes: 1.0V at –40°C and 0.64V at +85°C under no-load conditions.
How does the track mode function in MAX1706EEE+T, and what benefit does it provide?
In track mode (TRACK pin tied to OUT), the MAX1706EEE+T regulates its step-up output (POUT) to exactly 300mV above the LDO output voltage. This minimizes the LDO dropout voltage, reducing power dissipation and extending battery life - especially critical in Li-Ion systems where every millivolt of headroom matters. Track mode is enabled without software or external components.
Can MAX1706EEE+T drive a 200mA load on its LDO while delivering 400mA on POUT simultaneously?
Yes - but only if the total current drawn from POUT (including LDO input current) does not exceed the boost converter's capability. At 3.3V LDO output and 5.0V POUT, the LDO draws ~215mA from POUT (accounting for efficiency). With MAX1706EEE+T's 550mA PWM-mode limit, this leaves ~335mA available for external loads - well within safe operating range.
What is the purpose of the uncommitted comparator (LBP/LBN pins) in MAX1706EEE+T?
The LBP and LBN pins form a user-configurable low-battery comparator with 16mV hysteresis. When LBP voltage falls below LBN, the open-drain LBO pin asserts low - signaling host MCU of impending battery depletion. No external resistors or references are needed; the comparator shares the internal 1.250V reference and operates across the full –40°C to +85°C range.
Is MAX1706EEE+T pin-compatible with MAX1705EEE+T, and what are the key differences?
Yes - MAX1706EEE+T and MAX1705EEE+T share identical 16-pin QSOP packaging, pinout, and feature set. The primary difference is the n-channel MOSFET switch rating: MAX1706EEE+T has 0.5A current limit (950mA peak), while MAX1705EEE+T supports 1A (1550mA peak). All other electrical characteristics, timing, and control logic are identical.
MAX1706EEE+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:
- 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+T FAQ
1.How can I place an order for MAX1706EEE+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1706EEE+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 MAX1706EEE+T reliable?
The price and inventory of MAX1706EEE+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1706EEE+T is usually 5 days.
3.What payment methods are accepted for MAX1706EEE+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1706EEE+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1706EEE+T?
MAX1706EEE+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1706EEE+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 MAX1706EEE+T?
For technical support, including MAX1706EEE+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1706EEE+T requirements.
6.How does Aetrix verify that MAX1706EEE+T is sourced from the original manufacturer or authorized distributors?
All MAX1706EEE+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 MAX1706EEE+T meets industry standards.
7.What is the process for return or replacement of MAX1706EEE+T?
All MAX1706EEE+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1706EEE+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 MAX1706EEE+T part is unused and in its original packaging.
Return procedure for MAX1706EEE+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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