Datasheet

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General Description

The MAX16025–MAX16030 are dual-/triple-/quad-volt-

age monitors and sequencers that are offered in a

small TQFN package. These devices offer enormous

design flexibility as they allow fixed and adjustable

thresholds to be selected through logic inputs and pro-

vide sequence timing through small external capaci-

tors. These versatile devices are ideal for use in a wide

variety of multivoltage applications.

As the voltage at each monitored input exceeds its

respective threshold, its corresponding output goes

high after a propagation delay or a capacitor-set time

delay. When a voltage falls below its threshold, its

respective output goes low after a propagation delay.

Each detector circuit also includes its own enable input,

allowing the power-good outputs to be shut off inde-

pendently. The independent output for each detector is

available with push-pull or open-drain configuration

with the open-drain version capable of supporting volt-

ages up to 28V, thereby allowing them to interface to

shutdown and enable inputs of various DC-DC regula-

tors. Each detector can operate independently as four

separate supervisory circuits or can be daisy-chained

to provide controlled power-supply sequencing.

The MAX16025–MAX16030 also include a reset func-

tion that deasserts only after all of the independently

monitored voltages exceed their threshold. The reset

timeout is internally fixed or can be adjusted externally.

These devices are offered in a 4mm x 4mm TQFN

package and are fully specified from -40°C to +125°C.

Applications

Multivoltage Systems

DC-DC Supplies

Servers/Workstations

Storage Systems

Networking/Telecommunication Equipment

Features

o 2.2V to 28V Operating Voltage Range

o Fixed Thresholds for 3.3V, 2.5V, 1.8V, 1.5V, and

1.2V Systems

o 1.5% Accurate Adjustable Threshold Monitors

Voltages Down to 0.5V

o 2.7% Accurate Fixed Thresholds Over

Temperature

o Fixed (140ms min)/Capacitor-Adjustable Delay

Timing

o Independent Open-Drain/Push-Pull Outputs

o Enable Inputs for Each Monitored Voltage

o 9 Logic-Selectable Threshold Options

o Manual Reset and Tolerance Select (5%/10%) Inputs

o Small, 4mm x 4mm TQFN Package

o Fully Specified from -40°C to +125°C

MAX16025–MAX16030

Dual-/Triple-/Quad-Voltage, Capacitor-

Adjustable, Sequencing/Supervisory Circuits

________________________________________________________________

Maxim Integrated Products

TOP VIEW

IN1

IN3

IN4

TOL

OUT1

OUT3

OUT4

RESET

TH0

CDLY3

456

1718 16 14 13

CDLY2

CDLY1

EN3

EN2

EN1

GND

MAX16029

MAX16030

IN2

OUT2

CDLY4

EN4

CRESET

TH1

THIN QFN

(4mm x 4mm)

Pin Configurations

Ordering Information

19-0525; Rev 3; 1/07

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

Denotes lead-free package.

For tape and reel, add a “T” after the “+.” All tape and reel

orders are available in 2.5k increments.

EVALUATION KIT

AVAILABLE

PART* TEMP RANGE

PIN-

PACKAGE

PKG

CODE

MAX16025TE+ -40°C to +125°C 16 TQFN T1644-4

MAX16026TE+ -40°C to +125°C 16 TQFN T1644-4

MAX16027TP+ -40°C to +125°C 20 TQFN T2044-3

MAX16028TP+ -40°C to +125°C 20 TQFN T2044-3

MAX16029TG+ -40°C to +125°C 24 TQFN T2444-4

MAX16030TG+ -40°C to +125°C 24 TQFN T2444-4

Selector Guide

PART

MONITORED

VOLTAGES

INDEPENDENT

OUTPUTS

RESET

OUTPUT

MAX16025 2 2 (Open-drain) Open-drain

MAX16026 2 2 (Push-pull) Push-pull

MAX16027 3 3 (Open-drain) Open-drain

MAX16028 3 3 (Push-pull) Push-pull

MAX16029 4 4 (Open-drain) Open-drain

MAX16030 4 4 (Push-pull) Push-pull

Pin Configurations continued at end of data sheet.

Summary of content (15 pages)

PAGE 1
9-0525; Rev 3; 1/07 KIT ATION EVALU E L B AVAILA Dual-/Triple-/Quad-Voltage, CapacitorAdjustable, Sequencing/Supervisory Circuits The MAX16025–MAX16030 are dual-/triple-/quad-voltage monitors and sequencers that are offered in a small TQFN package. These devices offer enormous design flexibility as they allow fixed and adjustable thresholds to be selected through logic inputs and provide sequence timing through small external capacitors.
PAGE 2
MAX16025–MAX16030 Dual-/Triple-/Quad-Voltage, CapacitorAdjustable, Sequencing/Supervisory Circuits ABSOLUTE MAXIMUM RATINGS (All voltages referenced to GND.) VCC .........................................................................-0.3V to +30V EN1–EN4 ....................................................-0.3V to (VCC + 0.3V) OUT1–OUT4 (push-pull).............................-0.3V to (VCC + 0.3V) OUT1–OUT4 (open-drain) ......................................-0.3V to +30V RESET (push-pull) ...............
PAGE 3
Dual-/Triple-/Quad-Voltage, CapacitorAdjustable, Sequencing/Supervisory Circuits (VCC = 2.2V to 28V, TA = -40°C to +125°C, unless otherwise specified. Typical values are at VCC = 3.3V and TA = +25°C.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS 0.465 0.5 0.535 V nA CRESET AND CDLY_ CRESET Threshold VTH-RESET CRESET rising, VCC = 3.3V CRESET Charge Current ICH-RESET VCC = 3.3V 380 500 620 CDLY_ Threshold VTH-CDLY CDLY_ rising, VCC = 3.3V 0.95 1 1.
PAGE 4
Typical Operating Characteristics (VCC = 3.3V, TA = +25°C, unless otherwise noted.) SUPPLY CURRENT vs. TEMPERATURE 45 40 50 45 VCC = 12V 40 35 35 30 30 2 10 14 18 22 26 30 TOL = GND ADJUSTABLE THRESHOLD -40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (°C) TEMPERATURE (°C) NORMALIZED ADJUSTABLE THRESHOLD vs. TEMPERATURE OUT_ DELAY vs. CCDLY_ 4500 4000 3500 3000 2500 2000 1500 1000 500 3.
PAGE 5
Dual-/Triple-/Quad-Voltage, CapacitorAdjustable, Sequencing/Supervisory Circuits RESET OUTPUT LOW VOLTAGE vs. SINK CURRENT RESET OUTPUT HIGH VOLTAGE vs. SOURCE CURRENT MAX16025 toc12 0.7 0.6 0.5 0.4 0.3 0.2 0.1 MAX16025 toc11 0.8 RESET OUTPUT HIGH VOLTAGE (V) 3.0 CRESET = VCC CDLY_ = OPEN EN_ 2.5 2.0 OUT_ 1.5 1.0 RESET 0.5 PUSH-PULL VERSIONS 0 0 1 2 3 4 5 7 6 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.
PAGE 6
MAX16025–MAX16030 Dual-/Triple-/Quad-Voltage, CapacitorAdjustable, Sequencing/Supervisory Circuits Pin Description PIN MAX16025/ MAX16026 6 MAX16027/ MAX16029/ MAX16028 MAX16030 NAME FUNCTION 1 1 1 VCC Supply Voltage Input. Connect a 2.2V to 28V supply voltage to power the device. All outputs are low when VCC is below the UVLO. For noisy systems, bypass VCC to GND with a 0.1µF capacitor. 2 2 2 IN1 Monitored Input 1.
PAGE 7
Dual-/Triple-/Quad-Voltage, CapacitorAdjustable, Sequencing/Supervisory Circuits PIN MAX16025/ MAX16026 11 MAX16027/ MAX16029/ MAX16028 MAX16030 14 17 NAME FUNCTION OUT1 Output 1. When the voltage at IN1 is below its threshold or EN1 goes low, OUT1 goes low. RESET Active-Low Reset Output. RESET asserts low when any of the monitored voltages (IN_) falls below its respective threshold, any EN_ goes low, or MR is asserted.
PAGE 8
MAX16025–MAX16030 Dual-/Triple-/Quad-Voltage, CapacitorAdjustable, Sequencing/Supervisory Circuits TH0 IN1 TH1 EN4 EN3 EN2 EN1 DELAY THRESHOLD SELECT LOGIC 250nA LOGIC DRIVER OUT1 DRIVER OUT2 DRIVER OUT3 DRIVER OUT4 DRIVER RESET 1V IN2 MAX16029 MAX16030 DELAY IN3 DELAY IN4 DELAY GND RESET DELAY LOGIC TOL REFERENCE VCC CDLY1 CDLY2 CDLY3 CDLY4 CRESET MR Figure 1.
PAGE 9
Dual-/Triple-/Quad-Voltage, CapacitorAdjustable, Sequencing/Supervisory Circuits MAX16025–MAX16030 VCC VUVLO IN_ VTH VTH t < tON EN_ OUT_ tDELAY- tON tON tDELAY+ tOFF tRST_DELAY tRP tRP tRP RESET Figure 2. Timing Diagram (CDLY_ Open) Detailed Description The MAX16025–MAX16030 are low-voltage, accurate, dual-/triple-/quad-voltage microprocessor (µP) supervisors in a small TQFN package. These devices provide supervisory and sequencing functions for complex multivoltage systems.
PAGE 10
MAX16025–MAX16030 Dual-/Triple-/Quad-Voltage, CapacitorAdjustable, Sequencing/Supervisory Circuits Applications Information Tolerance The MAX16025–MAX16030 feature a pin-selectable threshold tolerance. Connect TOL to GND to select the thresholds 5% below the nominal value. Connect TOL to VCC to select the threshold tolerance 10% below the nominal voltage. Do not leave TOL unconnected.
PAGE 11
Dual-/Triple-/Quad-Voltage, CapacitorAdjustable, Sequencing/Supervisory Circuits V t RP = TH−RESET × CCRESET + 35 × 10 −6 ICH−RESET where VTH-RESET is 0.5V, ICH-RESET is 0.5µA, tRP is in seconds, and CCRESET is in Farads. To ensure timing accuracy and proper operation, minimize leakage at CCRESET. Adjustable Delay (CDLY_) When VIN rises above VTH with EN_ high, the internal 250nA current source begins charging an external capacitor connected from CDLY_ to GND.
PAGE 12
MAX16025–MAX16030 Dual-/Triple-/Quad-Voltage, CapacitorAdjustable, Sequencing/Supervisory Circuits +12V BUS +2.5V +3.3V IN DC-DC IN OUT DC-DC +1.8V OUT IN DC-DC EN EN IN1 EN1 OUT EN OUT1 IN2 EN2 OUT2 EN3 IN3 VCC OUT3 +3.3V MAX16027 MR SYSTEM RESET RESET CDLY1 CDLY3 CDLY2 GND CRESET TOL TH0 TH1 Figure 4. Sequencing Multiple-Voltage System 12V BUS 1.5V 1.8V TO LOADS 2.5V 3.3V VCC IN1 OUT1 IN2 OUT2 IN3 +3.
PAGE 13
Dual-/Triple-/Quad-Voltage, CapacitorAdjustable, Sequencing/Supervisory Circuits RESET OUT1 OUT2 TH0 RESET OUT1 OUT2 OUT3 TH0 TOP VIEW 12 11 10 9 15 14 13 12 11 7 EN2 6 EN1 5 GND 3 4 IN2 TOL THIN QFN (4mm x 4mm) 9 EN3 8 EN2 7 EN1 6 GND MAX16027 MAX16028 CDLY1 20 + 1 VCC 2 IN1 VCC 1 CRESET 17 CDLY2 19 CDLY1 16 + TH1 CDLY3 18 MAX16025 MAX16026 CDLY2 15 10 2 3 4 5 TOL CRESET 14 MR 16 IN3 TH1 IN2 8 IN1 MR 13 THIN QFN (4mm x 4mm) Chip Informatio
PAGE 14
Package Information (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.) 24L QFN THIN.EPS MAX16025–MAX16030 Dual-/Triple-/Quad-Voltage, CapacitorAdjustable, Sequencing/Supervisory Circuits PACKAGE OUTLINE, 12, 16, 20, 24, 28L THIN QFN, 4x4x0.
PAGE 15
Dual-/Triple-/Quad-Voltage, CapacitorAdjustable, Sequencing/Supervisory Circuits PACKAGE OUTLINE, 12, 16, 20, 24, 28L THIN QFN, 4x4x0.8mm 21-0139 E 2 2 Revision History Pages changed at Rev 1: 1, 3, 15 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.