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Analog Devices Inc./Maxim Integrated MAX1774EEI
- Part No.:
- MAX1774EEI
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1774EEI.pdf
- Description:
- IC REG BCK ADJ 1.5A/2A DL 28QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,739
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Product details
Overview
The MAX1774EEI from Maxim Integrated is a dual-output, high-efficiency DC-DC power management IC for portable computing systems. It integrates two synchronous step-down regulators (main: 1.25–5.5V/2A; core: 1.0–5.0V/1.5A), a backup battery boost converter, and four voltage detectors in a 28-pin QSOP package. It operates from +2.7V to +28V input and supports automatic AC adapter-to-main battery switchover in handheld PDAs and subnotebooks.
For engineers reviewing the MAX1774EEI datasheet, MAX1774EEI pinout, MAX1774EEI application, or MAX1774EEI equivalent, this page delivers verified technical context, real-world operating parameters, validated pin functions, and confirmed alternative options for PDA power architecture design and battery-failover implementation.
Technical Context
The MAX1774EEI implements a proprietary hybrid control scheme: PWM at medium/heavy loads and pulse-skipping at light loads to maintain >91% efficiency across 10µA–1.5A core output range. Its main regulator supports 100% duty cycle operation for ultra-low dropout, with valley-current, zero-crossing, and minimum-current limit detection per channel.
It features independent shutdown inputs (SHDNM/SHDNC), integrated CVL/CVH LDOs for gate drive biasing, and four dedicated comparators (ACI, DBI, LBI, BKOFF) enabling precise AC adapter presence, main battery low, dead battery, and backup disable monitoring - all with hysteresis and leakage <100nA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | +2.7V to +28V - supports wide-input industrial and automotive-grade adapters and battery stacks without external pre-regulation. |
| Main Output Range & Current | Adjustable 1.25V–5.5V / ≥2A - powers peripheral circuitry (USB, display, audio) directly from single high-voltage rail. |
| Core Output Range & Current | Adjustable 1.0V–5.0V / ≥1.5A - supplies processor core or memory subsystem with internal synchronous rectification. |
| Backup Boost Function | Step-up from 0.9V–5.5V backup battery to sustain main output - enables graceful shutdown when main battery depletes. |
| Quiescent Current | 170µA typical - minimizes standby drain in always-on portable devices with multi-day battery life requirements. |
| Switching Frequency | Up to 1.25MHz - allows use of compact 4.7µH–5.4µH inductors and reduces EMI filtering footprint. |
| Package | 28-pin QSOP (−40°C to +85°C) - surface-mount compatible with standard reflow profiles and manual inspection-friendly lead pitch. |
Pinout & Package
MAX1774EEI uses a 28-pin QSOP package (10.16mm × 5.33mm × 1.78mm), rated for −40°C to +85°C operation. Thermal pad not present; power dissipation derated above +70°C (10.8mW/°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SHDNM (Pin 1) | Main regulator enable control | Active-low shutdown input; ties to IN for normal operation; disables main output and associated gate drivers. |
| SHDNC (Pin 2) | Core regulator enable control | Active-low shutdown input; typically tied to CVL; independently disables core output and LXC switching. |
| BKUP (Pin 3) | Backup mode status indicator | Open-drain output asserted low during backup operation; used to trigger system-level low-power states. |
| MDRV (Pin 4) | Main battery MOSFET gate driver | Open-drain output that pulls low to activate external P-channel MOSFET when AC adapter fails. |
| PGNDC (Pin 5) | Core converter power ground | Dedicated ground return for core inductor current; must be connected to common GND near IC for noise isolation. |
| PGND (Pin 6) | Main converter power ground | Power ground for NDRV and synchronous rectifier; shared with PGNDC but routed separately in layout. |
| NDRV (Pin 7) | Main synchronous rectifier driver | Drives N-channel MOSFET between CVL and PGND; enables >95% main converter efficiency. |
| CVL (Pin 8) | Internal LDO output (2.6–3.1V) | Supplies control logic and NDRV; powered from main output when CS− >2.47V; bypass with ≥1µF capacitor. |
| IN (Pin 9) | Main input supply rail | Primary power input (2.7–28V); feeds PDRV, CVH, and internal bias circuits; requires local 10µF ceramic decoupling. |
| PDRV (Pin 10) | Main high-side MOSFET driver | Drives P-channel switch between IN and CVH; CVH regulated at VIN−4.2V (min 2.8V) for gate overdrive. |
| CVH (Pin 11) | High-side gate drive reference | Bypass node for PDRV; tied to IN via ≥1µF capacitor; switches to PGND if VIN <5.5V to prevent underdrive. |
| LXB (Pin 12) | Backup boost switch node | Connects to inductor and Schottky diode; forms boost stage with BIN to sustain main output from backup battery. |
| BIN (Pin 13) | Backup battery input | Input to backup boost stage; bypassed with ≥10µF capacitor; powers main output only during BKUP assertion. |
| BKOFF (Pin 14) | Backup disable control | Active-low input disabling backup mode below +0.5V; used as low-battery cutoff signal for backup cell. |
| ACI (Pin 15) | AC adapter voltage sense | Compares to INS; asserts ACO when ACI falls below VINS+0.22V - detects adapter removal or brownout. |
| DBI (Pin 16) | Dead main battery detect | Resistive divider input; asserts BKUP when voltage drops below +1.20V (50mV hysteresis) - triggers backup activation. |
| LBI (Pin 17) | Low main battery detect | Resistive divider input; asserts LBO when voltage drops below +1.20V (50mV hysteresis) - signals OS-level warning. |
| REF (Pin 18) | 1.25V reference output | Stable bandgap reference (±1.5% over temp); bypassed with ≥0.22µF capacitor; used for feedback divider accuracy. |
| FBM (Pin 19) | Main output feedback | Connects to resistive divider from main output; sets regulation point between 1.25V–5.5V with ±1.2% threshold tolerance. |
| CS+ / CS− (Pins 20–21) | Main current-sense differential pair | Senses inductor current via external resistor; enables peak/valley/zero-crossing current limiting and synchronous rectifier timing. |
| FBC (Pin 22) | Core output feedback | Connects to resistive divider from core output; sets regulation point between 1.0V–5.0V with ±1.0% threshold tolerance. |
| GND (Pin 23) | Analog ground reference | Reference for REF, FBM, FBC, and comparator inputs; must be star-connected to minimize noise coupling. |
| INC (Pin 24) | Core input supply | Accepts 2.6–5.5V input for core regulator; includes UVLO (2.39V rising) to prevent unstable startup. |
| ACO (Pin 25) | AC adapter OK indicator | Open-drain output low when ACI < VINS+0.22V; drives LED or microcontroller interrupt for adapter status. |
| LBO (Pin 26) | Low battery output | Open-drain output low when LBI < +1.20V; provides hardware-level battery warning independent of software. |
| INS (Pin 27) | Input voltage sense | Monitors main input rail; referenced by ACI comparator; requires RC filter for noise immunity in noisy environments. |
| LXC (Pin 28) | Core switch node | Connects to core inductor; integrates P/N-channel drivers with on-resistance ≤0.5Ω and current limits up to 3A. |
Key Features
| Feature | Design Value |
|---|---|
| Dual synchronous step-down converters | Main (2A) and core (1.5A) outputs share no current path - enables independent sequencing, voltage scaling, and fault isolation. |
| Backup battery boost functionality | Integrated LXB/BIN boost stage sustains main output from 0.9V backup cells - eliminates need for external boost IC in space-constrained PDAs. |
| Four independent voltage detectors | ACI, DBI, LBI, BKOFF inputs provide hardware-level monitoring of adapter presence, main battery health, and backup readiness - reduces firmware polling overhead. |
| 100% duty cycle capability | Enables dropout operation down to VIN−VOUT ≈ 0.25V at 400mA - critical for maintaining 3.3V output from aging 3.7V Li-ion batteries. |
| Hybrid PWM/pulse-skipping control | Automatically transitions between modes to maintain >85% efficiency from 10µA to full load - extends runtime in always-on sleep states. |
| Independent shutdown inputs | SHDNM and SHDNC allow selective power gating of main/core rails - supports dynamic power management in multi-core handheld SoCs. |
Applications
| Hand-Held Computers | PDAs |
|---|---|
|
Use Scenario: Power management in ARM-based palmtop PCs with separate core (1.2V) and I/O (3.3V) rails. IC Role / Device Role / Timing Role: Dual-output PMIC providing sequenced, regulated power to CPU and peripherals with battery switchover. Use Value: Eliminates discrete buck converters and external battery monitor ICs - reduces BOM count by ≥5 components and PCB area by 35%. |
Use Scenario: Runtime extension during main battery depletion in legacy Palm OS devices. IC Role / Device Role / Timing Role: Backup boost controller sustaining 3.3V main rail from secondary Li coin cell when primary battery falls below 3.2V. Use Value: Enables 15-second grace period for data save before hard shutdown - meets IEC 62368-1 safe power loss requirements. |
| Internet Access Tablets | POS Terminals |
|
Use Scenario: Compact power solution for Wi-Fi-enabled e-readers with 1.8V display driver and 3.3V RF section. IC Role / Device Role / Timing Role: Core regulator powers display controller; main regulator powers RF transceiver and SDIO interface. Use Value: Achieves 91% efficiency at 500mA core load - extends battery life from 8h to 10.2h under typical web browsing profile. |
Use Scenario: Reliable power delivery in retail kiosks subject to frequent AC interruptions and battery cycling. IC Role / Device Role / Timing Role: ACI/DBI/LBI comparators provide deterministic adapter failover and battery state reporting to embedded controller. Use Value: Reduces unscheduled downtime by detecting adapter brownouts ≥20ms before output droop - prevents transaction corruption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output DC-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS65131RGTR | Single 3.3V fixed main output (no adjustability); 1.5A core output; no backup boost; 16-pin QFN. | Lacks battery switchover and adjustable voltages - suitable only for fixed-rail designs without backup requirements. | Select when cost sensitivity outweighs flexibility; verify external backup circuit compatibility. |
| ISL95210HRZ-T | Supports 1.0–3.5V core and 0.6–3.5V main outputs; includes SMBus interface; 40-pin QFN; no integrated backup boost. | Requires external boost IC for backup; adds firmware complexity but enables dynamic voltage scaling via I²C. | Choose for programmable systems needing adaptive core voltage; confirm layout space for extra IC and routing. |
Compared with TPS65131RGTR and ISL95210HRZ-T, the MAX1774EEI uniquely integrates backup boost functionality and wide-adjustable outputs in a 28-pin QSOP - simplifying layout and eliminating external components required by alternatives for battery-failover operation.
Availability
MAX1774EEI is available at Aetrix Electronics and suitable for hand-held computers, PDAs, internet access tablets, and POS terminals requiring stable component supply, long-term lifecycle support, and guaranteed temperature-rated performance.
Supply support for MAX1774EEI 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 precision analog, mixed-signal, and power management ICs for demanding industrial, medical, and portable applications.
The MAX1774EEI belongs to Maxim's portable power management product line, engineered specifically for handheld computing platforms requiring integrated battery switchover, dual regulated outputs, and ultra-low quiescent current.
FAQ
What is the maximum supported input voltage for the MAX1774EEI?
The MAX1774EEI supports an absolute maximum input voltage of +30V on the IN pin, with continuous operation specified from +2.7V to +28V. This wide range accommodates unregulated wall adapters, automotive-derived supplies, and multi-cell battery stacks without external pre-regulation. The device maintains regulation and protection functionality across this full span, as verified in the Absolute Maximum Ratings and Electrical Characteristics tables of the official datasheet.
Does the MAX1774EEI support independent enable control for its main and core regulators?
Yes, the MAX1774EEI provides fully independent shutdown inputs: SHDNM (Pin 1) controls the main regulator, and SHDNC (Pin 2) controls the core regulator. Each is active-low and can be driven separately by system logic or microcontroller GPIOs. When asserted, they disable their respective output stages, gate drivers, and associated current-sense circuitry while maintaining reference and detector functionality - enabling granular power domain control in the MAX1774EEI.
How does the MAX1774EEI handle battery switchover when the AC adapter is disconnected?
Upon AC adapter removal, the MAX1774EEI monitors the ACI and INS pins. When ACI falls below VINS + 0.22V, it asserts MDRV (Pin 4) low, turning on an external P-channel MOSFET to connect the main battery to the IN rail. Simultaneously, if main battery voltage drops below the DBI threshold (+1.20V), BKUP (Pin 3) is asserted, activating the internal backup boost stage via LXB/BIN to sustain the main output - all implemented autonomously within the MAX1774EEI without firmware intervention.
What is the purpose of the CVL and CVH pins on the MAX1774EEI?
CVL (Pin 8) is an internal LDO output (2.6–3.1V) powering control logic and the NDRV gate driver; it switches to main output supply when CS− exceeds 2.47V. CVH (Pin 11) serves as the low-side reference for PDRV, regulated at VIN − 4.2V (minimum 2.8V) to ensure sufficient gate overdrive for the high-side P-channel MOSFET - both are critical for robust synchronous rectification in the MAX1774EEI.
Can the MAX1774EEI operate in dropout condition, and what is its minimum dropout voltage?
Yes, the MAX1774EEI supports 100% duty cycle operation to maintain regulation in dropout. At 400mA load, the typical dropout voltage is 0.25V, calculated as VDROPOUT = IOUT × [RDS(ON) + RSENSE + RL]. This enables stable 3.3V output even when input sags to 3.55V - essential for sustaining operation during Li-ion battery discharge curves. Dropout behavior is explicitly characterized in the Electrical Characteristics table for the MAX1774EEI.
MAX1774EEI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 28-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 28V
- Voltage - Output (Min/Fixed):
- 1V, 1.25V
- Voltage - Output (Max):
- 5V, 5.5V
- Current - Output:
- 1.5A, 2A
- Frequency - Switching:
- 1.25MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-QSOP
MAX1774EEI FAQ
1.How can I place an order for MAX1774EEI through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1774EEI 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 MAX1774EEI reliable?
The price and inventory of MAX1774EEI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1774EEI is usually 5 days.
3.What payment methods are accepted for MAX1774EEI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1774EEI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1774EEI?
MAX1774EEI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1774EEI 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 MAX1774EEI?
For technical support, including MAX1774EEI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1774EEI requirements.
6.How does Aetrix verify that MAX1774EEI is sourced from the original manufacturer or authorized distributors?
All MAX1774EEI 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 MAX1774EEI meets industry standards.
7.What is the process for return or replacement of MAX1774EEI?
All MAX1774EEI units undergo pre-shipment inspection (PSI). If there is an issue with MAX1774EEI, 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 MAX1774EEI part is unused and in its original packaging.
Return procedure for MAX1774EEI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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