MIC2785

Dual Supply Voltage Monitor

with Manual Reset

General Description

The MIC2785 is a micropower voltage monitor that

provides

undervoltage

monitoring

and

manual

reset

capability in a tiny 1.2mm × 1.2mm QFN package. The

(/RST) output maintains a valid output state when the

voltage being monitored ramps up or down. The device

also includes a manual reset input (/MR). The /RST output

is an active low push-pull output.

The undervoltage detector compares the VIN pin voltage

against the factory-programmed threshold of 1.62V. The

reset output is asserted any time the input voltage drops

below the programmed threshold voltage. A reset can be

generated at any time by asserting the manual reset input,

/MR. This reset output will remain active until the release

of /MR. The /MR input can also be used to daisy-chain the

MIC2785 onto existing power monitoring circuitry or other

supervisors. Hysteresis is included to prevent chattering

due to noise.

The MIC2785 consumes a minimum of quiescent current,

only 5µA, 1.5µA from the main supply pin and 3.5µA from

the input pin. Offered in a tiny space saving 6-pin QFN

1.2mm × 1.2mm package.

Datasheets and support documentation are available on

Micrel’s web site at: www.micrel.com.

Features

• No external components

• Monitors input voltage for under-voltage condition

• Separate inputs for supply (VDD) and monitor (VIN)

• +1.5% VIN threshold voltage accuracy

• Valid /RST state with VIN down to 0.0V

• Valid /RST state with VDD down to 1.20V

• Factory-programmed 1.62V reference

• Manual reset input (/MR)

• Active low RESET (/RST) output

• Ultra-low input current – 5µA total (VIN and VDD)

• Rejects brief input transients

• –40°C to 85°C operating temperature range

• RoHS lead-free compliant

• Available in 6-pin 1.2mm × 1.2mm Thin QFN package

Applications

• Mobile phones

• PDAs

• GPS Receivers

Typical Application

Memory or Microprocessor Voltage Monitor

Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

May 15, 2015

Revision 2.0