MAXM17225 datasheet(9/14 Pages) MAXIM

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Tiny, 0.4V to 5.5V Input, 300nA IQ, nanoPower

Boost Module with True Shutdown

MAXM17225

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Detailed Description

The MAXM17225 is a nanoPower, ultra-low-IQ (300nA) boost module offered in a tiny eMGA package. The IC is

guaranteed to startup with voltages as low as 0.88V and post startup, the input voltage VIN can go down to 0.4V making

it ideal for battery-operated devices that undergo voltage discharge over time. Its ultra-low quiescent current of 300nA

prolongs battery life and extends product lifetime as well. The IC accepts input voltage from 0.4V to 5.5V and boosts it up

to programmable output voltages from 1.8V to 5V. The output voltage is set using a single external resistor (RSEL). The

product has a maximum efficiency of 95%. The module is well suited for a host of applications like battery-operated

devices, portable electronics where step-up conversion is needed in space constrained enclosures while demanding high

efficiency. A true shutdown disconnects the input from the output, conserving battery life. The IC has an integrated 1µH

inductor chosen for optimized operation, stability, and efficiency. Guaranteed Boost VOUT regulation for 250mV separation

between input and output voltages while driving heavy loads. A single external selectable resistor (RSEL) for VOUT setting

reduces quiescent current consumption in comparison with a conventional resistor feedback divider string. The

MAXM17225 has a fixed maximum 300ns switch turn-on time and peak inductor current limit of 1A. The IC auto-transitions

between the ULPM, LPM, and HP operating modes based on load current, enabling better system transient response

and efficiency. All these powerful features are packed in a tiny 10-lead eMGA package offering the end designer an

efficient tool to design products.

Integrated Inductor

A 1μH integrated inductor is used in MAXM17225 boost module. The chosen inductor (Murata part# DFE201610E-1R0M

= P2), offers optimized stability across the product operation range.

True Shutdown

The MAXM17225’s true shutdown feature has the following advantages:

• Eliminates the body diode conduction of high-side P-channel MOSFET synchronous rectifier.

• Draws zero current in forward/reverse direction from IN/OUT.

• VOUT can be pulled high without bootstrapping into VIN source.

Output Voltage Selection

The MAXM17225 has a unique single-resistor output selection method known as RSEL. At startup, the MAXM17225 uses

up to 200μA only during the select resistor detection time, typically for 600μs, to read the RSEL value. RSEL has many

benefits, which include lower cost and smaller size, and only one resistor is needed versus the two-resistor string in

conventional resistor divider feedback connections. Another benefit is RSEL allows customers to stock just one part in

their inventory system and use it in multiple projects with different output voltages just by changing a single standard 1%

resistor. Lastly, RSEL eliminates wasting current continuously through feedback resistors for ultralow-power battery-

operated products. Select the RSEL resistor value for the desired output voltage as shown in the RSEL Selection Table.

RSEL Selection Table

The MAXM17225 includes an RSEL pin to configure the output voltage. Resistors with a tolerance of 1% (or better) should

be chosen. See Output Voltage vs. corresponding RSEL resistor table below.

VOUT (V)

NOMINAL RESISTANCE RSEL (kΩ) - 1%

1.8

OPEN

1.9

909

2.0

768

2.1

634

2.2

536

2.3

453

2.4

383

2.5

324

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