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Analog Devices Inc./Maxim Integrated MAX1798EUP+
- Part No.:
- MAX1798EUP+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Power Management - Specialized
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
MAX1798EUP+.pdf
- Description:
- IC PWR SUPPLY CDMA CELL/PCS TSSO
- Quantity:
- Payment:
- Shipping:
Inventory:1,125
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Product details
Overview
MAX1798EUP+ from Maxim Integrated is a highly integrated CDMA/PCS handset power management IC containing five low-noise LDO regulators (one 300mA, four 150mA), SPI-compatible serial interface, 140ms reset timer, push-on/push-off control logic, and two 150mA open-drain drivers - all in a 20-pin TSSOP-EP package rated for -40°C to +85°C operation.
For engineers reviewing the MAX1798EUP+ datasheet, MAX1798EUP+ pinout, MAX1798EUP+ application, or MAX1798EUP+ equivalent, this device supports precise multi-rail voltage sequencing, low-noise RF/audio supply isolation, and battery-efficient shutdown control in single-cell Li+ portable systems.
Technical Context
The MAX1798EUP+ implements five independent LDOs with programmable output voltages (1.8V–3.3V in 32 steps), each featuring overcurrent and thermal protection. LDO1 uses a dedicated 2.5V–5.5V input (IN1) and delivers up to 300mA with ≤125mV dropout at 200mA; LDO2–LDO5 share dual-input rails (IN2/3 and IN4/5) and deliver 150mA each with ≤100mV dropout at 100mA.
Its SPI interface (CS/SDI/SCLK) enables full register control of enable states, output voltages, and driver outputs. The RSO open-drain reset output asserts low for ≥140ms at startup and during OUT1 undervoltage (−7.5% threshold), while DR1/DR2 provide 2Ω on-resistance for LED backlight or vibrator motor drive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 5.5V across three independent input rails (IN1, IN2/3, IN4/5) - compatible with single Li+ or multi-cell alkaline/NiMH sources. |
| LDO1 Output Current | 300mA max with ≤125mV dropout at 200mA - sufficient for baseband processor core supply under transient load. |
| LDO2–LDO5 Output Current | 150mA each with ≤100mV dropout at 100mA - optimized for low-noise RF, audio, PLL/VCO, and BBA supplies. |
| Output Voltage Programmability | 1.8V to 3.3V in 32 discrete steps via SPI - enables precise matching to ASIC/FPGA I/O or RF IC requirements. |
| Output Noise | 45µVRMS (10Hz–100kHz) - meets stringent noise requirements for sensitive RF receivers and PLLs. |
| Reset Timer | 140ms minimum assertion time on RSO - ensures reliable microcontroller initialization before release. |
| Shutdown Current | 1µA typical - preserves battery life during deep sleep modes in handheld devices. |
Pinout & Package
MAX1798EUP+ is housed in a thermally enhanced 20-pin TSSOP with exposed pad (EP), requiring solder connection of EP to PCB ground plane for optimal thermal performance and EMI suppression.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS (AS) | SPI Chip Select / I²C Address Select | Active-low enable for serial interface; determines device address in I²C mode. |
| SCLK (SCK) | SPI Clock Input | Rising-edge sampled clock; supports up to 2MHz operation for fast register updates. |
| DIN (SDA) | SPI Data Input / I²C Data Line | Serial command/data entry point; bidirectional in I²C mode with internal pull-up. |
| ONO | ON Status Output | Level-shifted replica of ON pin referenced to OUT1 voltage - used for system-level shutdown coordination. |
| RSO | Reset Output | Open-drain active-low reset signal with 14kΩ internal pullup to OUT1; asserts ≥140ms at startup or OUT1 undervoltage. |
| DR1 / DR2 | Open-Drain Driver Outputs | 2Ω on-resistance, 150mA sink capability - directly drives LED strings or vibrator motors without external FETs. |
| OUT1–OUT5 | LDO Regulated Outputs | Individually enabled/disabled and voltage-programmed via SPI; OUT1 powers critical baseband logic, others serve RF/audio subsystems. |
| IN1 / IN2/3 / IN4/5 | Independent Input Rails | Three isolated input domains allow separate battery or DC-DC source connections per LDO group - critical for noise isolation. |
Key Features
| Feature | Design Value |
|---|---|
| Five independently controllable LDOs | Enables selective power gating of subsystems (e.g., disable RF LDOs during standby) to reduce quiescent current. |
| 45µVRMS output noise (10Hz–100kHz) | Meets GSM/CDMA spectral mask requirements for RF supply rails without additional filtering. |
| >60dB crosstalk isolation below 10kHz | Prevents coupling between digital baseband and analog RF sections - eliminates need for physical board separation. |
| Programmable 1.8V–3.3V outputs in 32 steps | Supports voltage scaling across multiple ASIC generations or firmware-configurable I/O standards. |
| Push-on/push-off control with watchdog timer | Eliminates need for external power controller IC - simplifies mechanical button interface and reduces BOM count. |
| Thermally enhanced TSSOP-EP package | Exposes die pad to PCB ground plane, lowering junction-to-board thermal resistance by ~30% vs. standard TSSOP. |
Applications
| CDMA/PCS Handsets | PDA & Palmtop Systems |
|---|---|
Use Scenario: Powering baseband processor, RF transceiver, audio codec, and display backlight in compact cellular handsets. IC Role / Device Role / Timing Role: Central system power manager coordinating LDO sequencing, reset timing, and peripheral driver control. Use Value: Single-chip solution replaces 5 discrete LDOs + reset IC + driver FETs - reduces PCB area by >40% and component count by 8+ parts. |
Use Scenario: Supplying multiple voltage domains (core, I/O, memory, backlight) in battery-powered handheld computing devices. IC Role / Device Role / Timing Role: Multi-rail voltage supervisor with programmable startup order and fault response. Use Value: Enables dynamic voltage scaling and subsystem power-down via SPI commands - extends runtime by up to 22% in mixed-use workloads. |
| Single-Cell Li+ Portable Devices | 2-/3-Cell NiMH/Alkaline Systems |
Use Scenario: Providing regulated 1.8V, 2.5V, 2.8V, and 3.3V rails from a 2.7V–4.2V Li+ battery with minimal dropout loss. IC Role / Device Role / Timing Role: High-efficiency linear regulator array maintaining stable output despite battery voltage sag under load. Use Value: Delivers 300mA at <125mV dropout on main rail - sustains full performance down to 2.82V battery voltage (vs. 3.0V for typical alternatives). |
Use Scenario: Powering legacy portable electronics using alkaline or NiMH batteries with wide voltage range (1.2V–4.5V per cell). IC Role / Device Role / Timing Role: Wide-input LDO controller supporting brown-out detection and graceful shutdown across varying battery chemistries. Use Value: Undervoltage lockout thresholds (2.10V–2.45V per rail) prevent erratic behavior during battery depletion - improves user experience and data integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-LDO power management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1799EUP+ | I²C-compatible interface instead of SPI; identical LDO specs, pinout, and package - requires firmware change for bus protocol. | Preferred where system already uses I²C for other peripherals; eliminates need for SPI bus resource allocation. | Select MAX1799EUP+ only if I²C infrastructure exists and SPI routing is constrained. |
| TPS65120RGTR | Three LDOs (not five); no open-drain drivers; different pinout and register map; supports 1.2V–3.6V outputs in 100mV steps. | Targeted at simpler portable systems with fewer voltage domains; lacks integrated backlight/vibrator drive capability. | Choose TPS65120RGTR when design requires lower channel count and TI ecosystem compatibility, but accept added external driver components. |
Compared with MAX1799EUP+, the MAX1798EUP+ offers SPI-native control ideal for Maxim-based reference designs, while TPS65120RGTR trades integration for TI-specific toolchain support and reduced feature set - neither provides identical 5-LDO + dual-driver functionality in the same footprint.
Availability
MAX1798EUP+ is available at Aetrix Electronics and suitable for CDMA handset design, PDA power architecture, and single-cell Li+ portable electronics requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for MAX1798EUP+ 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 solutions for communications, computing, and consumer markets.
The MAX1798EUP+ belongs to Maxim's CDMA/PCS system power supply product line, engineered specifically to consolidate voltage regulation, reset generation, and peripheral drive functions into one IC for space-constrained mobile handsets.
FAQ
What is the maximum output current supported by the MAX1798EUP+ LDO1 regulator?
The MAX1798EUP+ LDO1 regulator supports a maximum continuous output current of 300mA. This rating is specified with ≤125mV dropout voltage at 200mA load and 2.5V–5.5V input range. Thermal derating applies above +70°C ambient, with 37.7mW/°C reduction in the 20-pin TSSOP-EP package.
Does the MAX1798EUP+ support I²C communication?
No, the MAX1798EUP+ features an SPI-compatible serial interface (CS/DIN/SCLK), not I²C. For I²C support, use the pin-compatible MAX1799EUP+ variant. Both share identical LDO specifications, pinout, and package, but require different firmware drivers due to protocol differences.
What is the purpose of the RSO pin on the MAX1798EUP+?
The RSO pin on the MAX1798EUP+ is an open-drain reset output that holds low for ≥140ms at power-up and during OUT1 undervoltage events (−7.5% threshold). It connects internally to OUT1 via a 14kΩ pullup resistor and signals the host microcontroller to delay initialization until stable power is confirmed.
Can the MAX1798EUP+ be used with a 2-cell NiMH battery?
Yes, the MAX1798EUP+ supports input voltages from 2.5V to 5.5V across its three input rails (IN1, IN2/3, IN4/5), making it compatible with 2-cell NiMH (2.4V–3.0V) and 3-cell alkaline (3.6V–4.5V) configurations. Its undervoltage lockout thresholds (2.10V–2.45V) prevent operation below safe battery levels.
How does the push-on/push-off functionality work on the MAX1798EUP+?
The MAX1798EUP+ implements push-on/push-off control via the ON and OFF pins: pressing ON momentarily powers up the IC and enables OUT1; within 35ms, OFF must be driven high to sustain operation, otherwise the watchdog timer triggers shutdown. This eliminates need for external power sequencers in handheld designs.
MAX1798EUP+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Applications:
- Cellular, CDMA Handset
- Current - Supply:
- 367µA
- Voltage - Supply:
- 2.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
MAX1798EUP+ FAQ
1.How can I place an order for MAX1798EUP+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1798EUP+ 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 MAX1798EUP+ reliable?
The price and inventory of MAX1798EUP+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1798EUP+ is usually 5 days.
3.What payment methods are accepted for MAX1798EUP+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1798EUP+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1798EUP+?
MAX1798EUP+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1798EUP+ 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 MAX1798EUP+?
For technical support, including MAX1798EUP+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1798EUP+ requirements.
6.How does Aetrix verify that MAX1798EUP+ is sourced from the original manufacturer or authorized distributors?
All MAX1798EUP+ 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 MAX1798EUP+ meets industry standards.
7.What is the process for return or replacement of MAX1798EUP+?
All MAX1798EUP+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1798EUP+, 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 MAX1798EUP+ part is unused and in its original packaging.
Return procedure for MAX1798EUP+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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