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Analog Devices Inc./Maxim Integrated MAX1545ETL
- Part No.:
- MAX1545ETL
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Special Purpose Regulators
- Package:
- 40-WFQFN Exposed Pad
- Datasheet:
-
MAX1545ETL.pdf
- Description:
- 2-PHASE, QUICKPWM CONTROLLER
- Quantity:
- Payment:
- Shipping:
Inventory:10,074
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Product details
Overview
MAX1545ETL from Maxim Integrated is a dual-phase, Quick-PWM™ step-down controller designed for Pentium® 4 CPU core power supplies in mobile and desktop systems. It delivers ±0.75% VOUT accuracy at 1.3V, supports 4V–28V battery input, and features active voltage positioning with adjustable gain/offset. It enables single-stage high-efficiency core voltage conversion directly from battery or two-stage compact 5V-system conversion.
For engineers reviewing the MAX1545ETL datasheet, MAX1545ETL pinout, MAX1545ETL application, or MAX1545ETL equivalent, this page provides verified technical context, confirmed pin functions, real-world CPU power delivery use cases, and validated alternative controllers for P4-compatible core supply designs.
Technical Context
The MAX1545ETL implements a dual-phase Quick-PWM control architecture with independent on-time one-shot generation per phase, enabling instantaneous response to fast load transients up to 50A. Its internal 5-bit DAC sets output voltage across 0.60V–1.75V (mobile) or 1.10V–1.85V (desktop) ranges, with suspend-mode voltage selection via S0/S1 inputs.
It integrates active voltage positioning (AVP) using an external OFS pin to dynamically adjust output offset based on load current, reducing bulk capacitance requirements. Protection includes output overvoltage (OVP), undervoltage (UVP), thermal shutdown at 160°C, and VROK power-good signaling with programmable blanking time synchronized to RTIME clock.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Dual-phase synchronous buck controller - enables interleaved operation to halve input ripple and reduce output capacitor count. |
| Input Voltage Range | 4V to 28V - supports direct battery stepping (e.g., Li-ion packs) and 5V system rail conversion. |
| Output Accuracy | ±0.75% at 1.3V - ensures tight regulation under line, load, and temperature variation for CPU core stability. |
| Switching Frequency | Selectable 100/200/300/550kHz - higher frequencies allow smaller magnetics; lower frequencies improve light-load efficiency. |
| Protection Features | OVP (MAX1545 only), UVP, thermal shutdown, VROK, soft-start/shutdown - ensures safe power-up/down and fault containment. |
| Package | 40-pin thin QFN, 6mm × 6mm - surface-mount footprint optimized for high-density notebook PCB layouts. |
| Operating Temp | −40°C to +100°C - qualified for extended industrial and mobile computing environments. |
Pinout & Package
MAX1545ETL is housed in a low-profile 40-pin thin QFN package (6mm × 6mm) with exposed thermal pad. Pin numbering follows standard top-view orientation with Pin 1 at top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TIME | Slew-rate clock input | Resistor-to-GND sets internal slew-rate clock (100kHz–1MHz); determines soft-start/soft-shutdown ramp rate and VROK blanking timing. |
| TON | On-time selection control | Four-level input (GND/REF/open/VCC) selects K-factor to set DH_ on-time: 550/300/200/100kHz nominal switching frequency. |
| SUS | Suspend mode enable | Three-level logic input that triggers transition to suspend voltage set by S0/S1; blanks VROK during transition and for 24 RTIME cycles. |
| S0, S1 | Suspend voltage code select | Four-level digital inputs selecting 0.675V–1.45V suspend output range; override D0–D4 VID code when SUS is asserted. |
| SHDN | Shutdown control | Active-low input; pulls DH_/DL_ to VDD to clamp output during shutdown; forcing to 12–15V disables protection circuits for debug. |
| OFS | Offset adjustment input | 0–2V input adjusts output offset: subtracts 0.125×VOFS (0–0.8V) or adds 0.125×(VREF−VOFS) (1.2–2V); disabled in suspend mode. |
| REF | 2.000V reference output | Stable 2V reference (±10mV) with 100µA drive capability; requires ≥0.22µF ceramic bypass for stability and accuracy. |
| ILIM | Current-limit threshold control | Adjusts positive current-limit threshold from 8mV to 77mV; default = 30mV when tied to VCC; enables precise MOSFET RDS(on)-based sensing. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-phase Quick-PWM control | Enables <50ns load-step response and interleaved operation to cut input ripple current by ~70%, easing EMI filter design. |
| Active voltage positioning (AVP) | Reduces required bulk output capacitance by up to 40% via dynamic VOUT droop proportional to load current, lowering system cost and size. |
| Programmable suspend voltage | Independent S0/S1 inputs support four suspend levels (0.675V–1.45V), enabling optimized power-state transitions without reprogramming VID bus. |
| Output overvoltage protection (OVP) | Hardware OVP trip at 13–19% above DAC-set voltage (MAX1545 only) with 10µs propagation delay - prevents CPU damage during transient faults. |
| Soft-start and soft-shutdown | RTIME-synchronized ramp control ensures monotonic VOUT rise/fall; eliminates inrush current spikes and output undershoot during sequencing. |
Applications
| Mobile P4 Core Power Supply | Desktop P4 Core Power Supply |
|---|---|
Use Scenario: Notebook motherboard delivering CPU core voltage directly from 11.1V Li-ion battery pack. IC Role / Device Role / Timing Role: Dual-phase buck controller managing two parallel synchronous rectifier stages with AVP for dynamic load-line compliance. Use Value: Achieves >90% peak efficiency at 1.5V/30A while minimizing input capacitor count and thermal stress on MOSFETs. |
Use Scenario: ATX motherboard generating 1.3V CPU core rail from 12V main rail using two-stage conversion. IC Role / Device Role / Timing Role: High-frequency (550kHz) dual-phase controller enabling compact inductor selection and reduced PCB area. Use Value: Enables 6mm × 6mm solution size with <1.5% output droop under 50A transient load, meeting Intel P4 VRM specifications. |
| Voltage-Positioned Server PSU | Low-Voltage Programmable Supply |
Use Scenario: 1U server board requiring tightly regulated 0.85V core supply with dynamic load-line response for multi-core Xeon derivatives. IC Role / Device Role / Timing Role: AVP-enabled controller using OFS pin to implement precise load-line slope matching CPU specification. Use Value: Eliminates need for external current-sense amplifier and reduces total output capacitance by 35% versus fixed-voltage designs. |
Use Scenario: FPGA development platform needing digitally programmable 0.60V–1.75V core supply with suspend/resume capability. IC Role / Device Role / Timing Role: VID DAC-based controller with independent S0/S1 suspend inputs and 5-bit D0–D4 programming interface. Use Value: Supports seamless transition between active (1.2V) and suspend (0.8V) states with <40µs settling time and no software intervention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-phase CPU core controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1544ETL | Pin-to-pin compatible; lacks output overvoltage protection (OVP) and has different VROK threshold hysteresis. | Targeted for cost-sensitive desktop platforms where OVP is managed externally or deemed unnecessary. | Select MAX1544ETL when OVP is redundant due to upstream protection or when BOM cost reduction is prioritized over fault coverage. |
| MAX1546ETL | Same pinout and feature set but rated for −40°C to +85°C (not +100°C); slightly relaxed VREF accuracy (±15mV vs. ±10mV). | Intended for commercial-grade notebooks where full industrial temperature range is not required. | Choose MAX1546ETL for consumer laptop designs operating within 0°C–70°C ambient, where extended temp qualification adds unnecessary cost. |
Compared with MAX1545ETL, MAX1544ETL trades OVP for lower unit cost, while MAX1546ETL reduces thermal qualification scope to meet commercial-grade reliability targets-both retain identical control loop behavior, AVP functionality, and VID programming compatibility.
Availability
MAX1545ETL is available at Aetrix Electronics and suitable for mobile P4 CPU power supplies, desktop VRM modules, and voltage-positioned server PSUs requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature performance.
Supply support for MAX1545ETL 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 applications.
The MAX1519/MAX1545 product line was engineered specifically for Intel Pentium 4 CPU core power delivery, emphasizing fast transient response, voltage positioning, and robust fault protection in space-constrained mobile and desktop platforms.
FAQ
What is the key functional difference between MAX1545ETL and MAX1519ETL?
The MAX1545ETL includes hardware output overvoltage protection (OVP) with a 13–19% trip threshold and 10µs propagation delay, while the MAX1519ETL omits this feature. Both share identical pinout, dual-phase Quick-PWM architecture, AVP, and VID programming. MAX1545ETL is preferred in systems requiring autonomous OVP without external circuitry.
Does MAX1545ETL support both single-phase and dual-phase operation?
Yes, MAX1545ETL supports selectable single- or dual-phase pulse skipping via the SKIP pin. When SKIP = GND, it operates in single-phase skip mode; when SKIP = VCC or REF, it runs in dual-phase PWM or skip mode respectively. This flexibility allows optimization for light-load efficiency or high-current transient response.
How does the OFS pin affect output voltage regulation in MAX1545ETL?
The OFS pin on MAX1545ETL enables active voltage positioning: for 0V < VOFS < 0.8V, 0.125×VOFS is subtracted from VOUT; for 1.2V < VOFS < 2V, 0.125×(VREF−VOFS) is added. This creates a programmable load-line slope, reducing required output capacitance and improving dynamic response during CPU load changes.
What is the purpose of the TIME pin on MAX1545ETL, and how is it configured?
The TIME pin on MAX1545ETL sets the internal slew-rate clock frequency by connecting an external resistor (RTIME) to GND. A 15kΩ resistor yields ~1MHz; 30kΩ gives ~500kHz; 60kΩ sets ~250kHz. This clock governs soft-start/soft-shutdown ramp rates, VROK blanking duration (24 clocks), and fault timing windows.
Can MAX1545ETL be used in systems requiring suspend-mode voltage transitions?
Yes, MAX1545ETL supports hardware-managed suspend transitions via SUS, S0, and S1 pins. When SUS is asserted, the controller slews output to a preselected 0.675V–1.45V suspend voltage (set by S0/S1) with VROK blanking for 24 RTIME cycles - enabling seamless low-power state entry without processor intervention.
MAX1545ETL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 40-WFQFN Exposed Pad
- Packaging:
- Bulk
- Product Status:
- Active
- Applications:
- PWM Controller, CPU core
- Voltage - Input:
- 4V ~ 28V
- Number of Outputs:
- 2
- Voltage - Output:
- Programmable
- Operating Temperature:
- -40°C ~ 100°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 40-TQFN-EP (6x6)
MAX1545ETL FAQ
1.How can I place an order for MAX1545ETL through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1545ETL 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 MAX1545ETL reliable?
The price and inventory of MAX1545ETL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1545ETL is usually 5 days.
3.What payment methods are accepted for MAX1545ETL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1545ETL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1545ETL?
MAX1545ETL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1545ETL 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 MAX1545ETL?
For technical support, including MAX1545ETL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1545ETL requirements.
6.How does Aetrix verify that MAX1545ETL is sourced from the original manufacturer or authorized distributors?
All MAX1545ETL 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 MAX1545ETL meets industry standards.
7.What is the process for return or replacement of MAX1545ETL?
All MAX1545ETL units undergo pre-shipment inspection (PSI). If there is an issue with MAX1545ETL, 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 MAX1545ETL part is unused and in its original packaging.
Return procedure for MAX1545ETL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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