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Analog Devices Inc./Maxim Integrated MAX1677EEE+
- Part No.:
- MAX1677EEE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1677EEE+.pdf
- Description:
- IC REG BOOST ADJ/3.3V DL 16QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:268
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Product details
Overview
The MAX1677EEE+ from Maxim Integrated is a dual-output, synchronous boost DC-DC converter designed for portable battery-powered systems requiring independent logic supply (3.3V fixed or 2.5–5.5V adjustable) and high-voltage LCD bias (±28V). It operates from 0.7V input-supporting 1–3-cell alkaline/NiCd/NiMH or single-cell Li-ion-and delivers up to 350mA on the main output with 95% peak efficiency via integrated P/N-channel MOSFETs and synchronous rectification. Its primary application is in PDAs and handheld terminals where low-quiescent-current PFM mode (20µA) and 1µA shutdown enable extended sleep-state battery life.
For engineers reviewing the MAX1677EEE+ datasheet, MAX1677EEE+ pinout, MAX1677EEE+ application, or MAX1677EEE+ equivalent, this page provides verified technical context for dual-rail power design in space-constrained, low-input-voltage portable electronics-including precise startup behavior below 1.1V, selectable PWM/PFM operation, ±28V LCD polarity control, and integrated low-battery detection with 614mV threshold.
Technical Context
The MAX1677EEE+ integrates two independent boost converters: a main boost converter (MBC) with internal P/N-channel MOSFETs and synchronous rectification, and an LCD boost converter with programmable polarity (via LCDPOL) and current limit (225mA/350mA). The MBC supports three operating modes-300kHz PWM, externally synchronized PWM (200–400kHz), and low-power PFM-selected by CLK/SEL, each with distinct current limits (550mA/250mA in PWM/PFM) and regulation accuracy (±3.3% VOUT tolerance).
Startup relies on a dedicated low-voltage oscillator enabling operation from 0.9V typical, transitioning to normal regulation above 2.25V; once running, it sustains regulation down to 0.7V VIN by powering internally from OUT. The LCD converter uses peak-current control with fixed 5.2µs max on-time and programmable off-time, delivering stable ±28V outputs with <0.5% load regulation and <0.1%/V line regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 0.7V to 5.5V - enables direct use of single-cell Li-ion or 1–3 alkaline/NiCd/NiMH batteries without pre-regulation. |
| Main Output Voltage | Factory-set 3.3V ±3.3% or adjustable 2.5V–5.5V - supports logic rail flexibility while maintaining tight regulation via FB pin feedback. |
| Main Output Current | Up to 350mA in PWM mode - sufficient for microcontroller cores and peripheral logic in PDA-class devices. |
| LCD Output Voltage | Programmable ±28V - configurable for positive or negative LCD bias using LCDPOL and external resistor dividers on LCDFB. |
| Quiescent Current | 20µA in PFM mode, 1µA in shutdown - minimizes battery drain during standby in pen-input and touch-enabled handhelds. |
| Switching Frequency | 300kHz (PWM), 40–300kHz (PFM), or 200–400kHz (externally synchronized) - allows EMI optimization and noise-sensitive wireless coexistence. |
| Reference Voltage | 1.25V ±2% (VREF), 1.25V ±0.4% (FB/LCDFB setpoint) - enables accurate output voltage setting and low-battery detection at 614mV threshold. |
Pinout & Package
MAX1677EEE+ is housed in a 16-pin QSOP package (5.0mm × 6.2mm, 0.635mm pitch), pin-compatible with standard SO-16 footprints but occupying only the area of an SO-8. Thermal performance supports 696mW continuous dissipation at +70°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 OUT | Output Sense & IC Power Input | Connects to POUT through 10Ω resistor; powers internal circuitry from regulated output-enables operation down to 0.7V VIN. |
| 2 FB | Main Boost Feedback Input | Grounded for 3.3V fixed output; used with resistor divider for 2.5–5.5V adjustable regulation (1.25V reference-based). |
| 3 LBI | Low-Battery Comparator Input | Accepts voltage divider from VIN; triggers LBO at 614mV falling threshold with <50nA bias current. |
| 4 CLK/SEL | Mode Control Input | Low = PFM (20µA IQ); High = 300kHz PWM; driven = 200–400kHz synchronized PWM. |
| 5 ON | Main Enable Input | Active-high logic control; pulls entire IC into 1µA shutdown when low. |
| 6 LCDON | LCD Converter Enable | High only enables LCD boost; requires ON = high and MBC output ≥90% of set value. |
| 7 LCDPOL | LCD Polarity & Current Limit Select | Connected to GND = negative output + 225mA limit; connected to OUT = positive output + 350mA limit. |
| 8 REF | Precision Reference Output | 1.25V ±2%, supplies up to 50µA-used for feedback, comparator references, or external circuit biasing. |
| 9 GND | Analog & Power Ground | Common return for FB, LBI, LCDFB, REF; separate PGND and LCDGND pins reduce ground noise coupling. |
| 10 LCDFB | LCD Feedback Input | 1.25V threshold for positive LCD; 0V threshold for negative LCD-sets output voltage via external resistor divider. |
| 11 LX | Main Boost Switch Drain | Drives external inductor; N-channel switch with 0.22Ω typical RDS(ON) and 550mA PWM current limit. |
| 12 LCDLX | LCD Boost Switch Drain | N-channel DMOS switch for ±28V generation; 1.0Ω typical RDS(ON); current limit set by LCDPOL. |
| 13 LCDGND | LCD Switch Source | Dedicated source node for LCDLX-isolates LCD switching noise from main converter ground path. |
| 14 PGND | Main Switch Source | Dedicated source node for LX-minimizes ground bounce during high di/dt main boost switching. |
| 15 POUT | Main Boost Synchronous Rectifier Source | Source of internal P-channel rectifier; connects to output capacitor-eliminates need for external Schottky diode above 1.4V VIN. |
| 16 LBO | Open-Drain Low-Battery Output | Sinks current when LBI < 614mV; compatible with CMOS logic (pull-up required); tolerates up to 6V on output. |
Key Features
| Feature | Design Value |
|---|---|
| No external FETs required | Integrated P/N-channel MOSFETs and synchronous rectifier eliminate discrete switches and Schottky diodes-reducing BOM count and PCB area. |
| Dual-mode main output | Factory preset 3.3V or user-adjustable 2.5–5.5V via FB pin-supports both standardized logic rails and custom voltage requirements. |
| Configurable LCD polarity & current limit | LCDPOL selects ±28V output polarity and reduces LCDLX peak current from 350mA to 225mA-enabling smaller inductors for low-current LCD panels. |
| Multi-mode control architecture | CLK/SEL pin selects between low-noise 300kHz PWM, low-IQ PFM, or externally synchronized PWM-optimizing efficiency vs. EMI trade-offs per system requirement. |
| Integrated precision reference & comparator | 1.25V ±2% REF and 614mV LBI threshold with <50nA bias-enable accurate voltage setting and battery monitoring without external components. |
Applications
| Handheld PDA Power Management | Portable Phone LCD Bias Supply |
|---|---|
|
Use Scenario: Powering ARM-based PDA with 3.3V CPU core and segmented STN LCD requiring +15V and -10V bias rails. IC Role / Device Role / Timing Role: Dual-output DC-DC controller generating logic supply and split LCD voltages from single 3.6V Li-ion cell. Use Value: Eliminates need for separate boost ICs and external FETs; 20µA PFM quiescent current extends standby time beyond 72 hours. |
Use Scenario: Providing adjustable positive LCD bias in compact feature phones with varying panel voltage requirements (e.g., +12V to +20V). IC Role / Device Role / Timing Role: Main boost supplies 2.8V RF section; LCD boost delivers programmable positive output via LCDFB resistor network. Use Value: LCDPOL and LCDFB enable software-tuned voltage scaling; ±28V headroom ensures compatibility across multiple display generations. |
| Industrial Hand-Held Terminal | Portable Test Instrument LCD Driver |
|
Use Scenario: Ruggedized barcode scanner operating from 2xAA alkaline cells (2.4V nominal) with active backlight and touch interface. IC Role / Device Role / Timing Role: Main output powers MCU and sensors at 3.3V; secondary output drives EL backlight at +100V (using charge-pump extension). Use Value: 0.7V minimum input allows full functionality until battery drops to 0.9V/cell; 1µA shutdown preserves charge during transport mode. |
Use Scenario: Portable oscilloscope with monochrome graphic LCD needing stable -15V and +15V bias under varying temperature and load conditions. IC Role / Device Role / Timing Role: Dual independent regulators maintain LCD contrast across -20°C to +70°C ambient with <0.5% load regulation. Use Value: Internal 1.25V reference and low-drift FB/LCDFB inputs ensure voltage accuracy within ±1.5% over temperature-critical for consistent display grayscale. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS65120RGTR | Single 3.3V main output (no adjustment), fixed +28V/-28V LCD outputs, 2.7–5.5V input range, no PFM mode. | Lacks adjustable main output and ultra-low-IQ PFM-unsuitable for sub-1V startup or battery-critical sleep states. | Choose for cost-sensitive designs where 3.3V-only logic rail and simplified layout outweigh IQ and flexibility needs. |
| LT3467EDD#TRPBF | Separate main and LCD controllers in one package; main output adjustable 2.5–5.5V, LCD up to ±30V; 1.5–10V input range. | Requires higher minimum input (1.5V) and lacks integrated low-battery comparator or reference-adds external components. | Prefer when higher LCD voltage margin (+30V) and independent loop tuning are needed, accepting larger solution size and missing system-level features. |
Compared with TPS65120RGTR and LT3467EDD#TRPBF, the MAX1677EEE+ uniquely combines sub-1V startup, 20µA PFM operation, factory-set or adjustable main output, and integrated reference/comparator-making it optimal for space- and battery-constrained portable devices requiring dual-rail flexibility without added support circuitry.
Availability
MAX1677EEE+ is available at Aetrix Electronics and suitable for PDAs, portable phones, and handheld terminals requiring stable component supply with guaranteed long-term availability and full traceability.
Supply support for MAX1677EEE+ 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 MAX1677EEE+ belongs to Maxim's portable power management product line, engineered specifically for dual-rail battery-powered systems needing efficient, compact, and flexible DC-DC conversion with integrated system supervision functions.
FAQ
What is the minimum input voltage required for MAX1677EEE+ to start up?
The MAX1677EEE+ features a dedicated low-voltage startup oscillator enabling reliable turn-on at 0.9V typical (0.7V to 1.1V range). Once started, it maintains regulation down to 0.7V input by powering internally from the OUT pin-making it uniquely suited for deeply discharged alkaline or NiMH cells. This behavior is confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables under "Minimum Startup Voltage".
Can MAX1677EEE+ generate both positive and negative LCD bias voltages from the same device?
Yes, the MAX1677EEE+ supports both polarities via the LCDPOL pin: connecting LCDPOL to GND configures the LCD boost converter for negative output (e.g., –28V), while connecting it to OUT enables positive output (e.g., +28V). The LCDFB feedback threshold shifts accordingly (0V for negative, 1.25V for positive), and external resistor dividers set the exact voltage-fully documented in Table 3 and Figures 2–3 of the datasheet.
Does MAX1677EEE+ require an external Schottky diode for synchronous rectification?
No, the MAX1677EEE+ integrates a 1Ω P-channel synchronous rectifier on the main boost output (POUT), eliminating the need for an external Schottky diode in most applications. Only when operating below 1.4V input (e.g., single-cell alkaline at end-of-life) is a parallel Schottky diode recommended to reduce startup voltage-per the "Synchronous Rectifier" section in the Detailed Description.
How does the MAX1677EEE+ implement low-battery detection?
The MAX1677EEE+ includes an on-chip comparator with a precise 614mV falling threshold on the LBI pin. When the divided input voltage falls below this level, the open-drain LBO pin sinks current. LBI draws less than 50nA, allowing high-value resistor dividers (e.g., 100kΩ/100kΩ) for minimal battery loading-details are provided in Figure 6 and the "Low-Battery Comparator" subsection.
What are the key differences between PWM and PFM operation modes in MAX1677EEE+?
In PWM mode (CLK/SEL = high), the MAX1677EEE+ switches at fixed 300kHz with up to 350mA output and higher IQ (115–300µA); in PFM mode (CLK/SEL = low), it pulses only as needed to maintain regulation, achieving 20µA IQ and up to 170mA output. The mode selection directly impacts efficiency vs. load profile, EMI signature, and maximum deliverable current-summarized in Table 2 and the "Low Power PFM Mode" section.
MAX1677EEE+ 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 (Fixed)
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 0.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.25V, 2.5V (3.3V)
- Voltage - Output (Max):
- 5.5V, 28V
- Current - Output:
- 350mA (Switch)
- Frequency - Switching:
- 300kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QSOP
MAX1677EEE+ FAQ
1.How can I place an order for MAX1677EEE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1677EEE+ 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 MAX1677EEE+ reliable?
The price and inventory of MAX1677EEE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1677EEE+ is usually 5 days.
3.What payment methods are accepted for MAX1677EEE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1677EEE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1677EEE+?
MAX1677EEE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1677EEE+ 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 MAX1677EEE+?
For technical support, including MAX1677EEE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1677EEE+ requirements.
6.How does Aetrix verify that MAX1677EEE+ is sourced from the original manufacturer or authorized distributors?
All MAX1677EEE+ 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 MAX1677EEE+ meets industry standards.
7.What is the process for return or replacement of MAX1677EEE+?
All MAX1677EEE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1677EEE+, 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 MAX1677EEE+ part is unused and in its original packaging.
Return procedure for MAX1677EEE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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