MAX1519, MAX1545 Dual-Phase, Quick-PWM Controllers for Programmable CPU Core Power Supplies

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The MAX1519/MAX1545 are dual-phase, Quick-PWM™, step-down controllers for desktop and mobile Pentium® 4 (P4) CPU core supplies. Dual-phase operation reduces input ripple current requirements and output voltage ripple while easing component selection and layout difficulties. The Quick-PWM control scheme provides instantaneous response to fast load-current steps. The MAX1519/MAX1545 include active voltage positioning with adjustable gain and offset, reducing power dissipation and bulk output capacitance requirements.

The MAX1519/MAX1545 are intended for two different notebook CPU core applications: stepping down the battery directly or stepping down the 5V system supply to create the core voltage. The single-stage conversion method allows these devices to directly step down high-voltage batteries for the highest possible efficiency. Alternatively, two-stage conversion (stepping down the 5V system supply instead of the battery) at a higher switching frequency provides the minimum possible physical size.

The MAX1519/MAX1545 comply with Intel's P4 specifications. The switching regulator features soft-start, power-up sequencing, and soft-shutdown. The MAX1519/MAX1545 also feature independent four-level logic inputs for setting the suspend voltage (S0-S1).

The MAX1519/MAX1545 include output undervoltage protection (UVP), thermal protection, and voltage regulator power-OK (VROK) output. When any of these protection features detect a fault, the controller shuts down. Additionally, the MAX1519/MAX1545 include overvoltage protection.

The MAX1519/MAX1545 are available in low-profile, 40-pin, 6mm x 6mm thin QFN packages. For other CPU platforms, refer to the pin-to-pin compatible MAX1544 and MAX1532/MAX1546/MAX1547 data sheets.

Key Features

Applications/Uses

Dual-Phase, Quick-PWM Controllers
±0.75% V_OUT Accuracy Over Line, Load, and Temperature (1.3V)
Active Voltage Positioning with Adjustable Gain and Offset
5-Bit On-Board DAC
- Mobile: 0.60V to 1.75V Output Range
- Desktop: 1.10V to 1.85V Output Range
Selectable 100kHz/200kHz/300kHz/550kHz Switching Frequency
4V to 28V Battery Input Voltage Range
Adjustable Slew-Rate Control
Drive Large Synchronous Rectifier MOSFETs
Output Overvoltage Protection (MAX1545 Only)
Undervoltage and Thermal-Fault Protection
Power Sequencing and Timing
Selectable Suspend Voltage (0.675V to 1.45V)
Soft-Shutdown
Selectable Single- or Dual-Phase Pulse Skipping

	Desktop and Mobile P4 Computers
	Low-Voltage, Digitally Programmable Power Supplies
	Multiphase CPU Core Supplies
	Servers/Desktop Computers
	Voltage-Positioned Step-Down Converters

Key Specifications: Step-Down Switching Regulators

Part Number

V_IN (min) (V)

V_IN (max) (V)

Min. V_OUT (V)

Max. V_OUT (V)

Output Adj. Method

Operating Current, I_CC (max) (mA)

Number of DC-DC Outputs

Operating Freq. (kHz)

Features

EV-Kit

Package

RoHS Available

Operating Temp. Range (°C)

Price^**

MAX1519

0.6

1.85

Digital/VID

3.8

100
200
300
550

•	Adjustable Frequency

•	Current Limit

•	Dual/Multi-Phase Controller

•	Fixed Frequency/ PWM Operation

•	Low Battery/ Power OK Output

•	Output Undervoltage Protection

•	Reset Output

•

Shutdown

•	Soft Start

•	Synchronous Rectifier

Yes

THIN QFN/40

Yes

-40 to +85

MAX1545

•	Adjustable Frequency

•	Current Limit

•	Dual/Multi-Phase Controller

•	Fixed Frequency/ PWM Operation

•	Reset Output

•

Shutdown

•	Soft Start

•	Synchronous Rectifier

$6.63 @ 1k

See All Step-Down Switching Regulators (223)

Notes:
^**This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.