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MAX1515

Low-Voltage, Internal Switch, Step-Down/DDR Regulator

Low-Voltage, Internal-Switch, Step-Down/DDR Regulator Optimized for Use in Low-Voltage Active-Termination Power Rails or Chipset Power Supplies in Notebook and Subnotebook Computers

Data Sheet

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Overview

Description

The MAX1515 constant-off-time, pulse-width-modulated (PWM) source/sink step-down DC-DC converter is optimized for use in low-voltage active-termination power rails or chipset power supplies in notebook and sub-notebook computers. This device features dual internal n-channel MOSFET power switches for high efficiency and reduced component count. External Schottky diodes are not required. An integrated boost switch eliminates the need for an external boost diode. The internal 40mΩ NMOS power switches easily source and sink continuous load currents up to 3A. The MAX1515 produces an adjustable output from +0.5V to +2.7V and achieves efficiencies as high as 95%.

The MAX1515 can be configured as a DDR regulator, producing an output that is exactly half the memory supply rail. The input of the power stage can be taken from the memory supply rail itself, resulting in an efficient power supply that returns the energy to the rail from which it was sourced. The MAX1515 includes a reference buffer that provides ±5mA of drive current.

The MAX1515 uses a unique current-mode, constant-off-time, PWM control scheme. A selectable pulse-skipping mode maintains high efficiency during light-load operation, yet still sources and sinks current on demand. The MAX1515 can also be operated in fixed-PWM mode for low output ripple. The programmable constant-off-time architecture sets switching frequencies up to 1MHz, which allows the user to optimize performance trade-offs between efficiency, output switching noise, component size, and cost. The MAX1515 features an adjustable soft-start to limit surge currents during startup and a low-power shutdown mode to disconnect the input from the output and reduce supply current below 1µA. The MAX1515 is available in a 24-pin thin QFN package with an exposed backside pad.

MAX1515: Typical Operating Circuit

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Key Features

Dual 40mΩ Internal n-Channel MOSFETs
Integrated Boost Switch
+1.3V to +3.6V Input Voltage Range
1% V_OUT Accuracy Over Line and Load
1MHz Maximum Switching Frequency
DDR Termination Regulator (DDR Mode)

Tracking Output Voltage
Source/Sink Pulse Skipping
±5mA Reference Buffer

Output Voltage (Non-DDR Mode)

+2.5V, +1.8V, or +1.5V Pin Selectable
+0.5V to +2.7V Adjustable

1.1V ±0.75% Reference Output
Adjustable Soft-Start Inrush Current Limiting
< 1µA (typ) Shutdown Supply Current
< 800µA (max) Operating Supply Current
Selectable Pulse-Skipping Operation at Light Loads
Positive and Negative Current Limit
Power-Good Window Comparator
Output Short-Circuit Protection

Applications/Uses

Active Termination Buses
Chipset/Graphics Processor Supplies
Notebook DDR Memory Termination

Parametric Specs

Part Number

V_IN
(V)

V_OUT1
(V)

Preset V_OUT
(V)

Output Adjust. Method

I_OUT1
(A)

Switch Type

Synchronous Switching

DC-DC Outputs

Oper. Freq.
(kHz)

Package/Pins

Budgetary
Price

min

max

min

max

See Notes

MAX1515

1.3

3.6

0.5

2.7

1.5

1.8

2.5

Preset

Resistor

Internal

Yes

1000

TQFN/24

$4.21 @1k

See All Step-Down Switching Regulators (380)

Pricing 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 and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Design Resources

Quality and Environmental Data

Request Reliability Report for: MAX1515
Lead-Free Package Tin (Sn) Whisker Reports

CAD Symbols and Footprints

MAX1515ETG+

MAX1515ETG+T

Quality And Environmental

Device	Fab Process	Technology	Sample size	Rejects	FIT at 25°C	FIT at 55°C

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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