MAX16033, MAX16034, MAX16035, MAX16036, MAX16037, MAX16038, MAX16039, MAX16040 Low-Power Battery Backup Circuits in Small µDFN Packages

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The MAX16033–MAX16040 supervisory circuits reduce the complexity and number of components required for power-supply monitoring and battery control functions in microprocessor (µP) systems. The devices significantly improve system reliability and accuracy compared to other ICs or discrete components. The MAX16033–MAX16040 provide µP reset, backup-battery switchover, power-fail warning, watchdog, and chip-enable gating features.

The MAX16033–MAX16040 operate from supply voltages up to 5.5V. The factory-set reset threshold voltage ranges from 2.32V to 4.63V. The devices feature a manual-reset input (MAX16033/MAX16037), a watchdog timer input (MAX16034/MAX16038), a battery-on output (MAX16035/MAX16039), an auxiliary adjustable reset input (MAX16036/MAX16040), and chip-enable gating (MAX16033–MAX16036). Each device includes a power-fail comparator and offers an active-low push-pull reset or an active-low open-drain reset.

The MAX16033–MAX16040 are available in 2mm x 2mm, 8-pin or 10-pin µDFN packages and are fully specified from -40°C to +85°C.

Key Features

Applications/Uses

Low 1.2V Operating Supply Voltage
Precision Monitoring of 5.0V, 3.3V, 3.0V, and 2.5V Power-Supply Voltages
Independent Power-Fail Comparator
Debounced Manual-Reset Input
Watchdog Timer, 1.6s Timeout
Battery-On Output Indicator
Auxiliary User-Adjustable RESETIN
Low 13µA Quiescent Supply Current
Two Available Output Structures:
- Active-Low Push-Pull Reset
- Active-Low Open-Drain Reset
Active-Low Reset Valid Down to 1.2V
Power-Supply Transient Immunity
140ms (min) Reset Timeout Period
Small 2mm x 2mm, 8-Pin and 10-Pin µDFN Packages

	Portable/Battery-Powered Equipment
	POS Equipment
	Critical µP/µC Power Monitoring
	Set-Top Boxes
	Controllers
	Computers
	Fax Machines
	Industrial Control
	Real-Time Clocks
	Intelligent Instruments

Key Specifications: Battery Backup Circuits

Part Number

Reset Threshold Range (V)

Active-Low Reset Output

Max. I_CC (µA)

Features

RoHS Available

Package

Operating Temp. Range (°C)

Price^**

MAX16033

1.8 to 2.5
2.5 to 3.3
3.3 to 5.5

Open Drain
Push-Pull

•	Chip Enable Gate

•	Manual Reset

•	Power Fail Comparator

Yes

MicroDFN/10

-40 to +85

$1.98 @ 1k

MAX16034

•	Chip Enable Gate

•	Power Fail Comparator

•

Watchdog

MicroDFN/10

$1.98 @ 1k

MAX16035

•	Battery On

•	Chip Enable Gate

•	Power Fail Comparator

MicroDFN/10

$1.98 @ 1k

MAX16036

•	Adjustable Reset Input

•	Chip Enable Gate

•	Power Fail Comparator

MicroDFN/10

$1.98 @ 1k

MAX16037

•	Manual Reset

•	Power Fail Comparator

MicroDFN/8

$1.59 @ 1k

MAX16038

•	Power Fail Comparator

•

Watchdog

MicroDFN/8

$1.59 @ 1k

MAX16039

•	Battery On

•	Power Fail Comparator

MicroDFN/8

$1.59 @ 1k

MAX16040

•	Adjustable Reset Input

•	Power Fail Comparator

MicroDFN/8

$1.59 @ 1k

See All Battery Backup Circuits (89)

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.