MAX1536

PRODUCTION

3.6A, 1.4MHz, Low-Voltage, Internal-Switch Step-Down Regulator with Dynamic Output Voltage Control

3.6A, 1.4MHz, Low-Voltage, Internal Switch Step-Down Regulator with Dynamic Output-Voltage Control

Data Sheet (Rev. 1) Product Selection Table

Part Models: 2
1ku List Price: Starting From $7.94

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Overview

Dynamically Selectable Output Voltage from +0.7V to V_IN
Internal PMOS/NMOS Switches
- 54mΩ/47mΩ On-Resistance at V_IN = +4.5V
- 63mΩ/53mΩ On-Resistance at V_IN = +3.0V
+3.0V to +5.5V Input Voltage Range
1.4MHz Maximum Switching Frequency
2V ±0.75% Reference Output
Constant-Off-Time PWM Operation
Selectable Idle Mode/PWM Operation at Light Loads
100% Duty Factor in Dropout
Digital Soft-Start Inrush Current Limiting
<1µA Typical Shutdown Supply Current
<750µA Quiescent Supply Current
Thermal Shutdown
1% V_OUT Accuracy Over Line and Load
External Reference Input
Power-Good Window Comparator
Selectable Power-Good Blanking Time During Output-Voltage Transition

The MAX1536 constant-off-time, pulse-width-modulated (PWM) step-down DC-to-DC converter is ideal for use in +5.0V and +3.3V to low voltages for notebook and subnotebook computers. The MAX1536 features an internal PMOS power switch and internal synchronous rectification for high efficiency and reduced component count. No external Schottky diode is required across the internal synchronous rectifier switch. The internal 54mΩ PMOS power switch and 47mΩ NMOS synchronous-rectifier switch easily deliver continuous load currents up to 3.6A. The MAX1536 produces dynamically adjustable output voltages for chipsets and graphics processor cores using a logic-level control signal. The MAX1536 achieves efficiencies as high as 96%.

The MAX1536 uses a unique current-mode, constant-off-time, PWM control scheme. It has selectable Idle Mode™ to maintain high efficiency during light-load operation, or fixed-PWM mode for low output ripple. The programmable constant-off-time architecture allows a wide range of switching frequencies up to 1.4MHz, optimizing performance trade-offs between efficiency, output switching noise, component size, and cost. The MAX1536 features a digital soft-start to limit surge currents during startup, a 100% duty-cycle mode for low-dropout operation, and a low-power shutdown mode that disconnects the input from the output and reduces supply current below 1µA. The MAX1536 is available in a 28-pin thin QFN package with an exposed backside pad.

Applications

Active Termination Buses
Chipset/Graphics Cores with Dual-Supply Voltages
DDR Memory Termination
Notebook Computers

Part Models: 2
1ku List Price: Starting From $7.94

Documentation

Data Sheet 1

MAX1536: 3.6A, 1.4MHz, Low-Voltage, Internal-Switch Step-Down Regulator with Dynamic Output Voltage Control Data Sheet (Rev.1) 09/26/2005

Reliability Data 1

MAX1536 Reliability Data 01/12/2023

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
MAX1536ETI+	28-LFCSP-5X5X0.75	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX1536ETI+T	28-LFCSP-5X5X0.75	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Jun 20, 2016 - 1612 ASSEMBLY
		pcn_1612
MAX1536ETI+	PRODUCTION
MAX1536ETI+T	PRODUCTION

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Hardware Ecosystem

Parts	Product Life Cycle	Description
Switching Regulators & Controllers 6
MAX1830	PRODUCTION	3A, 1MHz, Low-Voltage, Step-Down Regulators with Synchronous Rectification and Internal Switches
MAX1843	PRODUCTION	2.7A, 1MHz, Low-Voltage, Step-Down Regulator with Internal Synchronous Rectification in TQFN Package
MAX1842	PRODUCTION	1A/2.7A, 1MHz, Step-Down Regulators with Synchronous Rectification and Internal Switches
MAX1809	PRODUCTION	3A, 1MHz, DDR Memory Termination Supply

MAX1714	PRODUCTION	High-Speed Step-Down Controller for Notebook Computers
MAX1644	PRODUCTION	2A, Low-Voltage, Step-Down Regulator with Synchronous Rectification and Internal Switches

Evaluation Kits

Evaluation Kit for the MAX1536

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Features and Benefits

3.0V to 5.5V Input Voltage Range
Dynamically Selectable 1.5V/1.8V Output Voltage
Adjustable Output Voltage from 0.7V to VIN
Up to 3.6A Output Current
Up to 1.4MHz Switching Frequency
<0.2µA (typ) IC Shutdown Supply Current
No External Schottky Diode Required
Power-Good Output
Surface-Mount Construction
Fully Assembled and Tested

Product Details

The MAX1536 evaluation kit (EV kit) provides dynamically adjustable 1.5V/1.8V output voltages from a 3.0V to 5.5V input voltage source. It delivers up to 3.6A output current with up to 93% efficiency.

The MAX1536 EV kit includes the MAX1536 step-down switching regulator with an internal synchronous rectifier to increase efficiency and reduce the number of external components. The resistor-programmable fixedoff- time, current-mode architecture allows an optimum response to load-and-line transients. This EV kit, as configured, operates at approximately 570kHz and is optimized for 3.3V input and 1.8V output.

The EV kit is a fully assembled and tested circuit board. It also allows the evaluation of other output voltages in the 0.7V to VIN range.