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Analog Devices Inc./Maxim Integrated MAX1536ETI+
- Part No.:
- MAX1536ETI+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
MAX1536ETI+.pdf
- Description:
- IC REG BUCK ADJ 3.6A 28TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:180
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Product details
Overview
MAX1536ETI+ from Maxim Integrated is a 3.6A, 1.4MHz synchronous step-down DC-DC regulator with internal PMOS/NMOS switches (54mΩ/47mΩ at +4.5V), dynamic output voltage control (0.7V to VIN), and selectable Idle Mode/PWM operation - designed for chipset and GPU core power in notebook/sub-notebook computers.
For engineers reviewing the MAX1536ETI+ datasheet, MAX1536ETI+ pinout, MAX1536ETI+ application, or MAX1536ETI+ equivalent, this page delivers verified technical context, real-world operating parameters, package-specific layout guidance, and validated alternative options for low-voltage, high-efficiency point-of-load regulation.
Technical Context
The MAX1536ETI+ implements a current-mode, constant-off-time PWM architecture with programmable tOFF (via external RTOFF) enabling switching frequencies up to 1.4MHz. It supports two distinct light-load strategies: forced-PWM mode (SKIP = VCC) for low-noise EMI control, and pulse-skipping Idle Mode (SKIP = AGND) for >90% efficiency at sub-500mA loads.
Its dynamic output voltage control uses REFIN (0.7V–2.0V) to set VFB, enabling dual-voltage transitions (e.g., 1.5V ↔ 1.8V) via logic-level GATE control. The integrated 2.0V ±0.75% reference, power-good window comparator (±10%), and digital soft-start (256-cycle ramp) ensure robust startup and system coordination.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3.6A RMS continuous - supports GPU core and chipset loads without external MOSFETs or Schottky diodes. |
| Input Voltage Range | +3.0V to +5.5V - compatible with standard 3.3V/5V system rails and battery-backed supplies. |
| Output Voltage Range | +0.7V to VIN - enables direct low-voltage core regulation (e.g., 0.7V for advanced CPUs) with external REFIN. |
| Switching Frequency | Up to 1.4MHz - allows compact 1.0–1.5µH inductors and reduces EMI filtering burden. |
| Efficiency | Up to 96% at full load - achieved via synchronous rectification and low RDS(on) (54mΩ PMOS / 47mΩ NMOS). |
| Feedback Accuracy | ±4mV over line/load/temp - ensures ±1% VOUT accuracy critical for sensitive processor cores. |
| Shutdown Current | <1µA typical - enables ultra-low-power system suspend states without leakage concerns. |
Pinout & Package
The MAX1536ETI+ is housed in a 28-pin thin QFN (5mm × 5mm) with exposed thermal pad, optimized for high-current thermal dissipation and PCB area efficiency in space-constrained notebooks.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LX (Pins 1,21,24,26) | Power switch node | Drain connection for internal PMOS/NMOS; must be shorted together and routed with low-inductance copper for 3.6A peak currents. |
| IN (Pins 2,3,19,20) | Main power input | Supplies internal PMOS switch; requires local 2×10µF X5R ceramic bypassing close to pins. |
| PGND (Pins 22,23,27,28) | Power ground return | Source of internal NMOS sync rectifier; must connect directly to exposed paddle and low-impedance ground plane. |
| REFIN (Pin 13) | Dynamic reference input | Sets regulated VOUT = VREFIN × (1 + RA/RB); enables real-time voltage scaling for GPU cores. |
| GATE (Pin 10) | Logic-controlled output selector | Drives OD/OD outputs to toggle between two REFIN-set voltages (e.g., 1.5V/1.8V) without external logic. |
| FBLANK (Pin 17) | Fault blanking timer select | Four-level input (AGND/REF/open/VCC) configures PGOOD blanking time (100–150µs) during voltage transitions. |
Key Features
| Feature | Design Value |
|---|---|
| Dynamically adjustable output | VOUT set by external 0.7–2.0V REFIN voltage, enabling dual-core voltage modes without firmware changes. |
| Internal synchronous switches | 54mΩ PMOS + 47mΩ NMOS at +4.5V eliminates Schottky diode, reducing BOM count and thermal loss. |
| Selectably optimized light-load behavior | SKIP pin selects fixed-frequency PWM (low ripple) or pulse-skipping Idle Mode (high efficiency below 600mA). |
| Digital soft-start | Current-limit ramps from 1.2A to 4.8A over 768 LX cycles, limiting inrush into large output capacitors. |
| 100% duty-cycle dropout | Enables LDO-like operation near VIN = VOUT; dropout = ILOAD × RDS(on) + inductor DCR. |
Applications
| Chipset Power Delivery | GPU Core Regulation |
|---|---|
|
Use Scenario: Providing tightly regulated, dynamically scaled voltage to Intel/AMD chipset I/O and memory controllers in ultraportable notebooks. IC Role / Device Role / Timing Role: Primary buck converter delivering 1.05V–1.8V at up to 3.6A with fast transient response to bursty memory traffic. Use Value: Eliminates external MOSFETs and diodes while maintaining ±1% output accuracy across temperature and load. |
Use Scenario: Supplying dual-voltage modes (e.g., 1.5V idle / 1.8V boost) to discrete or integrated graphics processing units during workload transitions. IC Role / Device Role / Timing Role: Synchronous step-down regulator with REFIN/GATE-controlled voltage switching and PGOOD sequencing. Use Value: Achieves <100µs voltage transition time and maintains >92% efficiency at 200mA load in Idle Mode. |
| DDR Memory Termination | Active Termination Bus |
|
Use Scenario: Generating precise 0.75V–1.25V termination voltage for DDR2/DDR3 memory buses in mobile platforms. IC Role / Device Role / Timing Role: Low-noise, high-accuracy buck regulator with ±4mV feedback tolerance and low output ripple in PWM mode. Use Value: Meets JEDEC VTT tolerance specs while supporting dynamic VTT scaling during memory self-refresh. |
Use Scenario: Powering active termination networks on high-speed parallel buses (e.g., PCI-X, legacy SCSI) requiring stable, low-impedance bias. IC Role / Device Role / Timing Role: Fast-transient buck regulator with 100% duty-cycle capability and thermal shutdown protection. Use Value: Delivers 1.5A continuous current with <330mV dropout at 3A, ensuring clean termination under bus contention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54332DR | 3.5A, 1MHz max fSW, external MOSFETs required; no integrated NMOS sync rectifier. | Lacks dynamic REFIN-based voltage scaling and Idle Mode; suited for fixed-output industrial rails. | Choose when board space allows discrete FETs and fixed 1.2V/1.8V outputs suffice. |
| RT8205AZSP | 3A, 1.5MHz, integrated FETs, but only 0.8–5.5V VOUT range; no REFIN pin or GATE-controlled dual-voltage mode. | No dynamic voltage control; limited to single-output configurations with resistor-divider feedback. | Prefer for cost-sensitive designs where GPU/chipset voltage scaling is not required. |
Compared with TPS54332DR and RT8205AZSP, the MAX1536ETI+ uniquely combines integrated synchronous switches, REFIN-based dynamic voltage control, and selectable light-load modes - making it the only option among the three qualified for GPU core power with real-time voltage scaling in notebook platforms.
Availability
MAX1536ETI+ is available at Aetrix Electronics and suitable for notebook computer power delivery, GPU core regulation, and DDR memory termination requiring stable component supply, lead-free compliance, and long-term lifecycle support.
Supply support for MAX1536ETI+ 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 computing, communications, and industrial systems.
The MAX1536ETI+ belongs to Maxim's low-voltage, high-current DC-DC regulator product line, engineered specifically for dynamic, multi-rail power delivery in space- and efficiency-constrained portable computing platforms.
FAQ
What is the maximum continuous output current of the MAX1536ETI+?
The MAX1536ETI+ delivers up to 3.6A RMS continuous output current under thermal limits, verified across the full -40°C to +85°C operating range with proper PCB layout and thermal pad soldering. This rating assumes use of recommended 1.0–1.5µH inductors and adequate copper area for the exposed paddle. Peak currents up to ±5.7A are supported for short durations per absolute maximum ratings.
How does the MAX1536ETI+ achieve dynamic output voltage control?
The MAX1536ETI+ achieves dynamic output voltage control through its REFIN pin: the regulated output voltage equals VREFIN × (1 + RA/RB). By driving REFIN with an external DAC or logic-selectable resistor network - and using the GATE pin to toggle between two REFIN levels - the MAX1536ETI+ switches VOUT (e.g., 1.5V ↔ 1.8V) in under 100µs without firmware intervention.
What are the key differences between Idle Mode and PWM Mode on the MAX1536ETI+?
Idle Mode (SKIP = AGND) reduces switching frequency under light loads (<600mA typ) to maximize efficiency (>90% at 100mA), with discontinuous inductor current. PWM Mode (SKIP = VCC) maintains constant ~1.4MHz operation for low output ripple and predictable EMI, with continuous conduction. Both modes share identical regulation accuracy and transient response.
Does the MAX1536ETI+ require an external Schottky diode?
No, the MAX1536ETI+ does not require an external Schottky diode. Its integrated 47mΩ NMOS synchronous rectifier replaces the diode entirely, improving efficiency by eliminating forward voltage drop and enabling bidirectional current handling during light-load discontinuous operation.
What thermal management considerations apply to the MAX1536ETI+ package?
The MAX1536ETI+ uses a 28-pin thin QFN with exposed thermal pad that must be soldered to a minimum 1in² copper area on the PCB for rated 3.6A operation. Thermal resistance θJA is 20.8mW/°C above +70°C; junction temperature must stay below +150°C. Layout requires short, wide traces for IN, LX, and PGND, and direct thermal vias under the paddle connected to inner ground planes.
MAX1536ETI+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 28-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.7V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 3.6A
- Frequency - Switching:
- Up to 1.4MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TQFN (5x5)
MAX1536ETI+ FAQ
1.How can I place an order for MAX1536ETI+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1536ETI+ 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 MAX1536ETI+ reliable?
The price and inventory of MAX1536ETI+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1536ETI+ is usually 5 days.
3.What payment methods are accepted for MAX1536ETI+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1536ETI+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1536ETI+?
MAX1536ETI+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1536ETI+ 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 MAX1536ETI+?
For technical support, including MAX1536ETI+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1536ETI+ requirements.
6.How does Aetrix verify that MAX1536ETI+ is sourced from the original manufacturer or authorized distributors?
All MAX1536ETI+ 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 MAX1536ETI+ meets industry standards.
7.What is the process for return or replacement of MAX1536ETI+?
All MAX1536ETI+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1536ETI+, 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 MAX1536ETI+ part is unused and in its original packaging.
Return procedure for MAX1536ETI+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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