Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsLinear ICsLinear IC - Comparator + voltage ref circuit Open drain, Rail-to-rail UCSP 6 (1x1.52)

General Description

The MAX9025/MAX9028 nanopower comparators in

space-saving chip-scale (UCSP™) packages feature

Beyond-the-Rails™ inputs and are guaranteed to oper-

ate down to +1.8V. The MAX9025/MAX9026 feature

an on-board 1.236V ±1% reference and draw an ultra-

low supply current of only 1µA, while the MAX9027−

MAX9028 (without reference) require just 0.6µA of

supply current. These features make the MAX9025−

MAX9028 family of comparators ideal for all 2-cell battery-

monitoring/management applications.

The unique design of the output stage limits supply-

current surges while switching, virtually eliminating the

supply glitches typical of many other comparators. This

design also minimizes overall power consumption under

dynamic conditions. The MAX9025/MAX9027 have a

push-pull output stage that sinks and sources current.

Large internal-output drivers allow rail-to-rail output swing

with loads up to 5mA. The MAX9026/MAX9028 have an

open-drain output stage that makes them suitable for

mixed-voltage system design. All devices are available in

the miniature 6-bump UCSP packages.

Refer to the MAX9117 data sheet for similar comparators

in 5-pin SC70 packages and the MAX9017 data sheet for

similar dual comparators in 8-pin SOT23 packages.

Applications

● 2-Cell Battery Monitoring/Management

● Ultra-Low-Power Systems

● Mobile Communications

● Notebooks and PDAs

● Sensing at Ground or Supply Line

● Telemetry and Remote Systems

● Medical Instruments

Features

● Space-Saving UCSP Package (1mm x 1.52mm)

● Ultra-Low Supply Current

• 0.6µA (MAX9027/MAX9028)

• 1µA with Reference (MAX9025/MAX9026)

● Guaranteed to Operate Down to +1.8V

● Internal 1.236V ±1% Reference (MAX9025/

MAX9026)

● Input Voltage Range Extends 200mV

Beyond-the-Rails

● CMOS Push-Pull Output with ±5mA Drive Capability

(MAX9025/MAX9027)

● Open-Drain Output Versions Available (MAX9026/

MAX9028)

● Crowbar-Current-Free Switching

● Internal Hysteresis for Clean Switching

● No Phase Reversal for Overdriven Inputs

19-3241; Rev 1; 6/11

Typical Application Circuit appears at end of data sheet.

+Denotes lead(Pb)-free/RoHS-compliant package.

T = Tape and reel.

Beyond-the-Rails and UCSP are trademarks of Maxim

Integrated Products, Inc.

PART

INTERNAL

REFERENCE

OUTPUT

TYPE

SUPPLY

CURRENT (µA)

MAX9025 Yes Push-Pull 1.0

MAX9026 Yes Open-Drain 1.0

MAX9027 No Push-Pull 0.6

MAX9028 No Open-Drain 0.6

PART

TEMP

RANGE

BUMP-

PACKAGE

TOP

MARK

MAX9025EBT+T -40°C to +85°C 6 UCSP ADB

MAX9026EBT+T -40°C to +85°C 6 UCSP ADC

MAX9027EBT+T -40°C to +85°C 6 UCSP ADD

MAX9028EBT+T -40°C to +85°C 6 UCSP ADE

TOP VIEW

(BUMPS ON BOTTOM)

UCSP

MAX9025–

MAX9028

OUT

IN+

REF

)

IN-

( ) MAX9027/MAX9028 PINS

Selector Guide

Ordering Information

Pin Congurations

MAX9025–MAX9028 UCSP, 1.8V, Nanopower, Beyond-the-Rails

Comparators With/Without Reference

EVALUATION KIT AVAILABLE

Summary of content (13 pages)

PAGE 1
EVALUATION KIT AVAILABLE MAX9025–MAX9028 UCSP, 1.8V, Nanopower, Beyond-the-Rails Comparators With/Without Reference General Description The MAX9025/MAX9028 nanopower comparators in space-saving chip-scale (UCSP™) packages feature Beyond-the-Rails™ inputs and are guaranteed to operate down to +1.8V. The MAX9025/MAX9026 feature an on-board 1.236V ±1% reference and draw an ultralow supply current of only 1µA, while the MAX9027− MAX9028 (without reference) require just 0.6µA of supply current.
PAGE 2
MAX9025–MAX9028 UCSP, 1.8V, Nanopower, Beyond-the-Rails Comparators With/Without Reference Absolute Maximum Ratings Supply Voltage (VCC to VEE).................................................+6V Voltage Inputs (IN+, IN-, REF)....... (VEE - 0.3V) to (VCC + 0.3V) Output Voltage MAX9025/MAX9027................. (VEE - 0.3V) to (VCC + 0.3V) MAX9026/MAX9028................................(VEE - 0.3V) to +6V Current into Input Pins........................................................20mA Output Current....
PAGE 3
MAX9025–MAX9028 UCSP, 1.8V, Nanopower, Beyond-the-Rails Comparators With/Without Reference Electrical Characteristics-MAX9025/MAX9026 (with REF) (continued) (VCC = +5V, VEE = 0V, VIN+ = VREF, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER High-to-Low Propagation Delay (Note 4) SYMBOL tPD- CONDITIONS MIN TYP VCC = 1.8V 7 VCC = 5V 6 MAX9025 only MAX UNITS µs VCC = 1.8V 11 VCC = 5V 28 VCC = 1.
PAGE 4
MAX9025–MAX9028 UCSP, 1.8V, Nanopower, Beyond-the-Rails Comparators With/Without Reference Electrical Characteristics-MAX9027/MAX9028 (without REF) (continued) (VCC = +5V, VEE = 0V, VCM = 0V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER Output Voltage Swing High Output Voltage Swing Low Output Leakage Current SYMBOL CONDITIONS MAX9027 only, VCC = TA = +25°C 5V, ISOURCE = 5mA TA = TMIN to TMAX VCC - VOH MAX9028 only, VCC = TA = +25°C 1.
PAGE 5
MAX9025–MAX9028 UCSP, 1.8V, Nanopower, Beyond-the-Rails Comparators With/Without Reference Typical Operating Characteristics (VCC = +5V, VEE = 0V, CL = 15pF, VOVERDRIVE = 100mV, TA = +25°C, unless otherwise noted.) TA = +25°C TA = -40°C 400 600 1.5 2.5 3.5 300 5.5 4.5 1.5 2.5 VCC = 5V VCC = 3V 500 400 300 -15 10 60 85 OUTPUT VOLTAGE LOW vs. SINK CURRENT 600 VCC = 3V VCC = 1.8V 400 200 0 VCC = 5V 0 2 4 VCC = 3V 20 15 VCC = 5V 10 6 SINK CURRENT (mA) www.maximintegrated.
PAGE 6
MAX9025–MAX9028 UCSP, 1.8V, Nanopower, Beyond-the-Rails Comparators With/Without Reference Typical Operating Characteristics (continued) (VCC = +5V, VEE = 0V, CL = 15pF, VOVERDRIVE = 100mV, TA = +25°C, unless otherwise noted.) 400 TA = +85°C 200 4 6 8 VCC = 5V 20 VCC = 3V 10 VCC = 1.8V -40 -15 10 35 60 20 VCC = 3V 10 VCC = 1.8V -15 -40 10 35 60 OFFSET VOLTAGE vs. TEMPERATURE HYSTERESIS VOLTAGE vs. TEMPERATURE INPUT BIAS CURRENT vs. INPUT BIAS VOLTAGE VCC = 3V 0.
PAGE 7
MAX9025–MAX9028 UCSP, 1.8V, Nanopower, Beyond-the-Rails Comparators With/Without Reference Typical Operating Characteristics (continued) (VCC = +5V, VEE = 0V, CL = 15pF, VOVERDRIVE = 100mV, TA = +25°C, unless otherwise noted.) VCC = 1.8V 15 tPD- (µs) VCC = 1.8V 1.236 VCC = 5V 50 40 tPD+ (µs) VCC = 3V 10 VCC = 5V 1.234 MAX9025/MAX9027 PROPAGATION DELAY (tPD+) vs. TEMPERATURE 5 MAX9025-28 toc21 VCC = 3V 1.238 20 MAX9025-28 toc19 REFERENCE VOLTAGE (V) 1.240 PROPAGATION DELAY (tPD-) vs.
PAGE 8
MAX9025–MAX9028 UCSP, 1.8V, Nanopower, Beyond-the-Rails Comparators With/Without Reference Typical Operating Characteristics (continued) (VCC = +5V, VEE = 0V, CL = 15pF, VOVERDRIVE = 100mV, TA = +25°C, unless otherwise noted.) PROPAGATION DELAY (VCC = 1.
PAGE 9
MAX9025–MAX9028 UCSP, 1.8V, Nanopower, Beyond-the-Rails Comparators With/Without Reference Functional Diagrams VCC VCC IN+ IN+ OUT IN- OUT IN- MAX9027 MAX9028 MAX9025 MAX9026 REF REF 1.236V VEE VEE Pin Description PIN MAX9025/ MAX9026 MAX9027/ MAX9028 NAME FUNCTION A2 A2 OUT Comparator Output A3 A3, B2 VEE Negative Supply Voltage B1 B1 IN+ Comparator Noninverting Input B2 — REF 1.
PAGE 10
MAX9025–MAX9028 UCSP, 1.8V, Nanopower, Beyond-the-Rails Comparators With/Without Reference Reference (MAX9025/MAX9026) The MAX9025−MAX9028s’ internal +1.236V reference has a typical temperature coefficient of 40ppm/ºC over the full -40ºC to +85ºC temperature range. The reference is a very-low-power bandgap cell, with a typical 35kΩ output impedance. REF can source and sink up to 100nA to external circuitry.
PAGE 11
MAX9025–MAX9028 UCSP, 1.8V, Nanopower, Beyond-the-Rails Comparators With/Without Reference THRESHOLDS IN+ VTHR HYSTERESIS IN- VHB VIN RFB RS VCC BAND VTHF MAX9027 OUT VCC/2 OUT Figure 2. Threshold Hysteresis Band Figure 3. MAX9025/MAX9027 External Hysteresis Simplest Circuit Asymmetrical Hysteresis The simplest circuit for adding external hysteresis is shown in Figure 3.
PAGE 12
MAX9025–MAX9028 UCSP, 1.8V, Nanopower, Beyond-the-Rails Comparators With/Without Reference Typical Application Circuit VCC VCC 100mVP-P +5V (+3V) IN+ +3V (+5V) OUT IN- 2MΩ MAX9027 VEE VCC RPULLUP IN- 3V (5V) LOGIC OUT OUT 2MΩ IN+ MAX9028 Figure 4.
PAGE 13
MAX9025–MAX9028 UCSP, 1.8V, Nanopower, Beyond-the-Rails Comparators With/Without Reference Revision History REVISION NUMBER REVISION DATE 0 5/04 Initial release — 1 6/11 Added information for lead-free versions 1 DESCRIPTION PAGES CHANGED For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.