My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX1705EEE+
- Part No.:
- MAX1705EEE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1705EEE+.pdf
- Description:
- IC REG BOOST ADJ 1A 16QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:492
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX1705EEE+ 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 operates from 0.7V to 3.6V input (1–3 NiCd/NiMH or 1 Li-Ion cell), delivers adjustable 2.5V–5.5V boost output and 1.25V–5.0V LDO output, and supports PWM/PFM mode selection via CLK/SEL pin for RF-sensitive portable instruments.
For engineers reviewing the MAX1705EEE+ datasheet, MAX1705EEE+ pinout, MAX1705EEE+ application, or MAX1705EEE+ equivalent, this device is selected for battery-powered wireless systems requiring simultaneous clean analog power (LDO) and high-current digital/RF rail (boost), with guaranteed 1.1V startup, 96% peak efficiency, and track-mode efficiency optimization.
Technical Context
The MAX1705EEE+ integrates two independent regulation paths: a current-mode PWM/PFM synchronous boost controller (300kHz nominal, synchronizable 200–400kHz) with internal 1A n-channel switch and 270mΩ p-channel synchronous rectifier, and a separate p-channel LDO with 0.5Ω dropout resistance, 1.25V reference, and FBLDO feedback. Both regulators share the same OUT pin as power input and reference point.
Its dual shutdown control (ONA/ONB) enables pushbutton-on/pushbutton-off sequencing, while TRACK pin enables dynamic alignment of boost output to LDO +300mV-reducing switching losses without compromising LDO headroom. The uncommitted low-battery comparator (LBP/LBN/LBO) provides hysteresis-controlled voltage monitoring independent of regulation loops.
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 850mA (PWM mode, VIN ≥ 2.4V → VOUT = 3.3V); limited by internal 1.28A n-MOSFET current limit. |
| Max LDO Output Current | 200mA continuous; requires ≥300mV headroom (VOUT – VLDO ≥ 0.3V) and stable 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 PFM low-power mode; 1µA in shutdown; no external bias required for REF or internal reference. |
| Switching Frequency | 300kHz fixed (CLK/SEL = high); synchronizable 200–400kHz; PFM mode varies frequency dynamically under light load. |
Pinout & Package
MAX1705EEE+ is housed in a 16-pin QSOP package (5.3mm × 10.2mm), pin-compatible with industry-standard 16-pin SOIC footprints but with 0.65mm lead pitch. Thermal pad is not present; power dissipation derated at 8.70mW/°C above +70°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LBP (Pin 1) | Low-battery comparator noninverting input | Accepts 0.5V–1.5V reference voltage; triggers LBO low when battery voltage falls below LBN threshold with 16mV hysteresis. |
| LBN (Pin 2) | Low-battery comparator inverting input | Sets trip point for battery undervoltage detection; common-mode range matches LBP for accurate differential sensing. |
| REF (Pin 3) | 1.250V precision reference output | Stable 1.250V ±12mV source; bypassed with 0.33µF capacitor; supplies bias for FB and FBLDO dividers. |
| TRACK (Pin 4) | Boost output tracking control | When tied to OUT, forces POUT = VLDO + 0.3V-reducing switching loss while preserving LDO regulation margin. |
| GND (Pin 5) | Analog and digital ground reference | Common return for REF, FB, FBLDO, CLK/SEL, ONA, ONB; must be low-impedance connection to PGND plane. |
| OUT (Pin 6) | IC power input and track reference | Supplies internal circuitry; bootstrapped from POUT; used as reference for TRACK mode and LDO input. |
| FB (Pin 7) | Boost output feedback input | Regulates POUT to 1.233V; connects to resistor divider between POUT and GND for output voltage programming. |
| FBLDO (Pin 8) | LDO output feedback input | Regulates LDO to 1.250V; connects to resistor divider between LDO and GND for LDO voltage programming. |
| LDO (Pin 9) | LDO linear regulator output | Delivers up to 200mA; requires 22µF/≤1Ω ESR ceramic capacitor to GND for stability across load range. |
| LBO (Pin 10) | Open-drain low-battery output | N-channel open-drain; sinks current when LBP < LBN; pulled up externally to enable microcontroller wake-up or LED alert. |
| CLK/SEL (Pin 11) | Mode selection and sync clock input | Logic high = PWM (300kHz); logic low = PFM; driven externally = synchronized PWM (200–400kHz). |
| PGND (Pin 12) | Power ground for n-MOSFET source | Separate ground return for high-current boost path; must be connected directly to input capacitor negative terminal. |
| LX (Pin 13) | Switch node (inductor connection) | Connects to inductor and Schottky diode anode; drives internal n-MOSFET drain and p-MOSFET source. |
| ONB (Pin 14) | Active-high shutdown control | Drives high to disable IC when ONA is low; tied to GND for standard operation; enables pushbutton-off functionality. |
| ONA (Pin 15) | Active-high enable control | Drives high to enable IC; tied to OUT for automatic turn-on at power-up; enables pushbutton-on functionality. |
| POUT (Pin 16) | Boost output (p-MOSFET source) | Main power output; feeds LDO input and system loads; current shared with LDO draw; requires 220µF output capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Integrated 270mΩ p-channel rectifier improves efficiency by 5% vs. diode-based boost converters; active in both PWM and PFM modes. |
| Track-mode efficiency optimization | Reduces POUT to VLDO + 300mV automatically-minimizing switching loss while maintaining sufficient LDO headroom for full 200mA delivery. |
| Dual shutdown control (ONA/ONB) | Enables momentary pushbutton on/off sequencing without external logic; ONA tied to OUT provides auto-start, ONB tied to GND enables hard shutdown. |
| Guaranteed 1.1V startup | CMOS low-voltage oscillator ensures reliable start from single-cell alkaline or depleted NiMH; sustains operation down to 0.7V after regulation is achieved. |
| Uncommitted low-battery comparator | Independent LBP/LBN inputs with 16mV hysteresis allow flexible battery monitoring thresholds; LBO open-drain output interfaces directly with µC interrupt pins. |
| External clock synchronization | CLK/SEL accepts 200–400kHz external clock to align switching harmonics away from sensitive IF bands in PCS/cordless phone applications. |
Applications
| Digital Cordless Phones | PCS Handsets |
|---|---|
|
Use Scenario: Powering RF power amplifier and baseband processor from single Li-Ion cell with tight noise and efficiency constraints. IC Role / Device Role / Timing Role: Dual-rail power source: POUT supplies PA (3.6V @ 500mA), LDO supplies analog front-end (3.3V @ 150mA) with ultra-low ripple. Use Value: Synchronous rectification and track mode deliver >92% efficiency at 3.6V/500mA; LDO PSRR >40dB at 100kHz suppresses switching noise from reaching sensitive RF stages. |
Use Scenario: Supporting dual-voltage subsystems (core logic at 2.8V, display driver at 5.0V) in compact PCS handset form factor. IC Role / Device Role / Timing Role: Primary PMIC: POUT set to 5.0V for display backlight, LDO set to 2.8V for ASIC core; ONA/ONB enable keypad-initiated power sequencing. Use Value: 1.1V startup allows operation until battery reaches 0.9V; PFM mode draws only 190µA at standby-extending talk time by 18% over nonsynchronous alternatives. |
| Palmtop Computers | Handheld Instruments |
|
Use Scenario: Providing clean 3.3V for microcontroller and 5.0V for USB transceiver from 2-cell NiMH pack in space-constrained palmtop design. IC Role / Device Role / Timing Role: Central DC-DC + LDO solution: POUT = 5.0V (USB), LDO = 3.3V (MCU); TRACK enabled to reduce heat generation during extended use. Use Value: 96% peak efficiency at 5.0V/200mA reduces thermal load in sealed enclosure; QSOP package fits 8-pin SO footprint-preserving legacy PCB layout. |
Use Scenario: Powering precision ADC, op-amps, and LCD controller from 1.5V alkaline cell in portable multimeter or data logger. IC Role / Device Role / Timing Role: Low-noise analog power manager: LDO supplies ADC reference (3.0V @ 50mA), POUT powers LCD backlight (5.0V @ 100mA); LBO alerts MCU on battery depletion. Use Value: LDO output noise <50µVRMS (DC–500kHz) ensures <16-bit ADC accuracy; 0.7V dropout capability extends usable battery life by 22% versus standard LDOs. |
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+ | 0.5A n-MOSFET switch (vs. 1A), lower max POUT current (435mA vs. 850mA), identical pinout and feature set. | Better suited for lower-power applications (e.g., pagers, simple sensors) where 200mA LDO + 400mA boost suffices. | Select MAX1706EEE+ when system peak load <450mA and board space or cost optimization is prioritized over headroom. |
| TPS61088RHLR | Single-inductor dual-output (buck-boost + LDO), 5.5A switch, no TRACK mode, no integrated low-battery comparator. | Requires external comparator for battery monitoring; lacks ONA/ONB pushbutton controls; higher quiescent current (300µA vs. 190µA in PFM). | Choose TPS61088RHLR only if dual-output flexibility and higher current capability outweigh loss of integrated battery monitor and ultra-low PFM IQ. |
Compared with MAX1706EEE+, the MAX1705EEE+ delivers double the boost current and maintains identical footprint and control logic; versus TPS61088RHLR, it offers lower PFM IQ, integrated battery monitoring, and track-mode efficiency tuning-but lacks buck-boost topology flexibility.
Availability
MAX1705EEE+ is available at Aetrix Electronics and suitable for digital cordless phones, PCS handsets, palmtop computers, and handheld instruments requiring stable component supply, guaranteed -40°C to +85°C operation, and long-term industrial availability.
Supply support for MAX1705EEE+ 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) designs high-performance analog and mixed-signal ICs for power management, interface, sensing, and RF applications in portable, industrial, and automotive systems.
The MAX1705EEE+ belongs to Maxim's portable power management product line, engineered specifically for battery-powered wireless devices needing simultaneous high-efficiency boost conversion and ultra-low-noise linear regulation in minimal board area.
FAQ
What is the minimum input voltage required to start up the MAX1705EEE+?
The MAX1705EEE+ guarantees startup from 1.1V at +25°C using its dedicated 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 operation from nearly depleted single-cell batteries in digital cordless phones and handheld instruments.
How does the TRACK pin improve efficiency in the MAX1705EEE+?
When the TRACK pin is connected to the OUT pin, the MAX1705EEE+ configures its boost converter to regulate POUT precisely 300mV above the LDO output voltage. This minimizes the voltage drop across the LDO pass transistor-reducing power dissipation and improving overall system efficiency-while preserving sufficient headroom for full 200mA LDO delivery under all load conditions.
Can the MAX1705EEE+ drive a 200mA load on both POUT and LDO simultaneously?
No-the MAX1705EEE+ shares current capacity between POUT and LDO. Its 1A n-MOSFET limits total available current: if LDO draws 200mA, the remaining POUT current is reduced by that amount (plus LDO dropout losses). For example, with VLDO = 3.3V and VOUT = 3.6V, POUT must supply both LDO bias and system load-so maximum combined output is constrained by thermal and current-limit margins.
What is the purpose of the dual ONA and ONB pins on the MAX1705EEE+?
ONA and ONB provide independent, hysteresis-equipped enable/disable controls: ONA is active-high (tie to OUT for auto-start), ONB is active-high shutdown (tie to GND for default operation). Together they enable true pushbutton-on/pushbutton-off functionality-allowing mechanical switches to sequence power without external logic or firmware intervention in portable devices like PCS handsets.
Does the MAX1705EEE+ require external compensation components for stability?
Yes-the MAX1705EEE+ requires specific external components per function: a 22µF/≤1Ω ESR capacitor at LDO, a 220µF output capacitor at POUT, a 0.1µF ceramic at OUT, and a 10µH inductor (or 22µH for MAX1706). The LDO loop also requires careful attention to C6 ESR-stability is guaranteed only within the region shown in Figure TC11 of the datasheet.
MAX1705EEE+ 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:
- 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+ FAQ
1.How can I place an order for MAX1705EEE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1705EEE+ 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+ reliable?
The price and inventory of MAX1705EEE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1705EEE+ is usually 5 days.
3.What payment methods are accepted for MAX1705EEE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1705EEE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1705EEE+?
MAX1705EEE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1705EEE+ 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+?
For technical support, including MAX1705EEE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1705EEE+ requirements.
6.How does Aetrix verify that MAX1705EEE+ is sourced from the original manufacturer or authorized distributors?
All MAX1705EEE+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX1705EEE+?
All MAX1705EEE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1705EEE+, 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+ part is unused and in its original packaging.
Return procedure for MAX1705EEE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX1705EEE+ Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
