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MAX38888

2.5V–5.0V, 0.5A/2.5A Reversible Buck/Boost Regulator for Backup Power Applications

Continua^™ Family of Backup Power Regulators Using Super Capacitor or Capacitor Bank

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Overview

Description

The MAX38888 is a storage capacitor or capacitor bank backup regulator designed to efficiently transfer power between a storage element and a system supply rail in reversible buck and boost operations using the same inductor.

When the main supply is present and above the minimum system supply voltage, the regulator operates in buck mode and charges the storage element at up to 500mA peak inductor current. Once the storage element is charged, the circuit draws only 2.5μA of current while it maintains the super capacitor or other storage element in its ready state. When the main supply is removed, the regulator operates in boost mode and prevents the system from dropping below the minimum operating voltage, discharging the storage element at up to 2.5A peak inductor current.

The MAX38888 is externally programmable for minimum and maximum voltage of the storage element, such as super capacitor, minimum system voltage, and maximum charge and discharge currents. The internal DC/DC converter requires only a 1μH inductor.

MAX38888: Typical Operating Circuit

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Key Features

2.5V to 5V System Output Voltage
0.8V to 4.5V Cap Voltage Range
Up to 2.5A Peak Inductor Discharge Current
Programmable Voltage and Current Thresholds
±2% Threshold Accuracy
Up to 95% Efficiency, Charge or Discharge
2.5μA Ready Quiescent Current
Small Solution Size
3mm x 3mm x 0.75mm TDFN Package

Applications/Uses

Handheld Industrial Equipment
Portable Computers
Portable Devices with a Removable Battery

Parametric Specs

See parametric specs for Battery Chargers (73)

Part Number

Lithium Ion Cells

Charging V_IN
(V)

Charge Rate Set by

Max. I_CHG
(A)

Charge Termination

Charge Regulation

Design Tools

Oper. Temp.
(°C)

Package/Pins

Budgetary
Price

max

See Notes

MAX38888

5.5

Preset

0.28

Max. Voltage

Switchmode

EE-Sim

-40 to +125

TDFN-CU/14

$3.13 @1k

See parametric specs for Step-Up Switching Regulators (101)

Part Number

V_IN
(V)

V_OUT1
(V)

I_OUT1
(A)

Output Adjust. Method

Switch Type

I_CC
(mA)

DC-DC Outputs

Oper. Freq.
(kHz)

Package/Pins

min

max

min

max

typ

MAX38888

0.8

4.5

2.5

Resistor

Internal

0.035

2000

See Data Sheet

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

MAX38888EVKIT: Evaluation Kit for the MAX38888

Additional Resources

Super Capacitor Calculator (XLSM)

Tools & Models

EE-Sim: Design & Simulate MAX38888

Quality And Environmental

Request Reliability Report for: MAX38888

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

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.

Quality Management System >
Environmental Management System >

Order

Status:

Package:

Temperature:

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