MAX6877ETG+ Maxim Integrated Products, MAX6877ETG+ Datasheet

IC SEQUENCE/SUPERVISOR 24TQFN

MAX6877ETG+

Manufacturer Part Number
MAX6877ETG+
Description
IC SEQUENCE/SUPERVISOR 24TQFN
Manufacturer
Maxim Integrated Products
Type
Sequencerr
Datasheet
1.MAX6878ETG.pdf (24 pages)

Specifications of MAX6877ETG+

Number Of Voltages Monitored
3
Output
Open Drain or Open Collector
Reset
Active Low
Reset Timeout
Adjustable/Selectable
Voltage - Threshold
Adjustable/Selectable
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
24-TQFN Exposed Pad
Monitored Voltage
- 0.3 V to + 6 V
Manual Reset
Not Resettable
Watchdog
No Watchdog
Supply Voltage (max)
5.5 V
Supply Voltage (min)
2.7 V
Supply Current (typ)
1100 uA
Maximum Power Dissipation
1667 mW
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Minimum Operating Temperature
- 40 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The MAX6877/MAX6878/MAX6879 multivoltage power
trackers/sequencers/supervisors monitor up to three
system voltages and provide proper power-up and
power-down control for systems requiring voltage track-
ing or sequencing. These devices ensure controlled
voltage tracking within a specified range or sequencing
in the proper order as system power supplies are
enabled. The MAX6877/MAX6878/MAX6879 generate
all required voltages and timing to control up to three
external n-channel pass FETs for the OUT1/OUT2/
OUT3 supply voltages (see the Selector Guide for dif-
ferent features of each device).
The MAX6877/MAX6878/MAX6879 feature adjustable
undervoltage thresholds for each input supply. When all
the voltages are above these adjustable thresholds, the
devices turn on the external n-channel MOSFETs to
either sequence or track the voltages to the system.
During voltage-tracking mode, the voltage at the GATE
of each MOSFET is increased to slowly bring up all
supplies at a controlled slew rate. The MAX6877/
MAX6878/MAX6879 feature an autoretry or latch-off
mode with capacitor-adjusted timing.
These devices also provide a controlled power-down
(tracking mode) when the system shuts off in an orderly
manner. When an unexpected fault occurs, the outputs
are all pulled down simultaneously with an internal
100Ω pulldown to help discharge capactive loads at
the MOSFET’s source. The MAX6877/MAX6878/
MAX6879 feature independent internal charge pumps
to fully enhance the external FETs for low-voltage drop
at highpass current. The MAX6877 and MAX6878 also
feature a power-good output with a selectable timeout
period that can be used for system reset.
The MAX6877/MAX6878/MAX6879 are available in
small 4mm x 4mm 24-pin and 16-pin thin QFN pack-
ages and are fully specified over the -40°C to +85°C
extended operating temperature range.
19-3771; Rev 1; 10/05
Selector Guide appears at end of data sheet.
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.
Multivoltage Systems
Networking Systems
Telecom
Storage Equipment
Servers/Workstations
________________________________________________________________ Maxim Integrated Products
General Description
Dual-/Triple-Voltage, Power-Supply
Trackers/Sequencers/Supervisors
Applications
♦ Pin-Selectable Tracking or Sequencing Control
♦ Capacitor-Adjustable Power-Up/Down Tracking
♦ Capacitor-Adjustable Power-Up Sequencing Delay
♦ Internal Charge Pumps to Enhance External
♦ Capacitor-Adjustable Timeout Period Power-Good
♦ Adjustable Undervoltage Lockout or
♦ Internal 100Ω Pulldown for Each Output to
♦ 0.5V to 5.5V Nominal IN_/OUT_ Range
♦ 2.7V to 5.5V Operating Voltage Range
♦ Immune to Short Voltage Transients
♦ Small 4mm x 4mm 24-Pin or 16-Pin Thin QFN
Ordering Information continued at end of data sheet.
+Denotes lead-free package.
MAX6877ETG+
Pin Configurations continued at end of data sheet.
for Up to Three Supply Voltages
Slew Rate
n-Channel FETs
Output (MAX6877/MAX6878)
Logic-Enable Input
Discharge Capacitive Load Quickly
Packages
TOP VIEW
*EXPOSED PADDLE CONNECTED TO GND.
PART
GATE2
GATE1
OUT1
IN3
IN2
IN1
19
20
21
22
23
24
18
1
4mm x 4mm THIN QFN
-40°C to +85°C
TEMP RANGE
+
17
2
Ordering Information
MAX6877
16
3
Pin Configurations
EP*
15
4
14
5
24 Thin QFN
PIN-
PACKAGE
13
6
12
11
10
9
8
7
Features
TRK/SEQ
LTCH/RTR
TIMEOUT
SLEW
DELAY
GND
T2444-4
CODE
PKG
1

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MAX6877ETG+ Summary of contents

Page 1

... Nominal IN_/OUT_ Range ♦ 2.7V to 5.5V Operating Voltage Range ♦ Immune to Short Voltage Transients ♦ Small 4mm x 4mm 24-Pin or 16-Pin Thin QFN Packages PART MAX6877ETG+ Ordering Information continued at end of data sheet. +Denotes lead-free package. TOP VIEW GATE2 Applications GATE1 *EXPOSED PADDLE CONNECTED TO GND ...

Page 2

Dual-/Triple-Voltage, Power-Supply Trackers/Sequencers/Supervisors ABSOLUTE MAXIMUM RATINGS (All voltages referenced to GND, unless otherwise noted.) IN1, IN2, IN3, V ....................................................-0.3V to +6V CC ABP .....................................-0.3V to the highest of V SET1, SET2, SET3 ....................................................-0.3V to +6V GATE1, GATE2, GATE3 .........................................-0.3V to ...

Page 3

Dual-/Triple-Voltage, Power-Supply ELECTRICAL CHARACTERISTICS (continued) , IN1, IN2, or IN3 = +2.7V to +5.5V, EN/UV = MARGIN = ABP are +25°C, unless otherwise noted.) (Note 1) A PARAMETER Power-Good Threshold Hysteresis GATE_ Output High ...

Page 4

Dual-/Triple-Voltage, Power-Supply Trackers/Sequencers/Supervisors EN/UV V EN_R EN/UV IN1 = 2.5V IN2 = 1.8V IN_ IN3 = 0.7V CAPACITOR- ADJUSTED SLEW RATE OUT_ t DELAY PG/RST t TIMEOUT Figure 1. Tracking Timing Diagram in Normal Mode 4 _______________________________________________________________________________________ BUS VOLTAGE MONITORED ...

Page 5

Dual-/Triple-Voltage, Power-Supply EN/UV V EN_R IN_ CAPACITOR- ADJUSTED SLEW RATE OUT_ t DELAY t PG/RST FAULT = HIGH FORCED INTO QUICK SHUTDOWN AFTER NORMAL SHUTDOWN WHEN IN1 GOES BELOW ITS SET VOLTAGE Figure 2. Tracking in Fast Shutdown Mode _______________________________________________________________________________________ ...

Page 6

Dual-/Triple-Voltage, Power-Supply Trackers/Sequencers/Supervisors EN/UV V EN_R IN1 = 2.5V IN2 = 1.8V IN3 = 0.7V IN_ CAPACITOR- ADJUSTED SLEW RATE OUT_ t DELAY PG/RST Figure 3. Sequencing in Normal Mode 6 _______________________________________________________________________________________ BUS VOLTAGE MONITORED THROUGH EN/UV INPUT MONITORED THROUGH ...

Page 7

Dual-/Triple-Voltage, Power-Supply EN/UV V EN_R IN1 = 2.5V IN2 = 1.8V IN3 = 0.7V IN_ CAPACITOR- ADJUSTED SLEW RATE OUT_ t DELAY PG/RST FAULT Figure 4. Sequencing in Fast Shutdown Mode _______________________________________________________________________________________ Trackers/Sequencers/Supervisors BUS VOLTAGE MONITORED THROUGH EN/UV INPUT MONITORED ...

Page 8

Dual-/Triple-Voltage, Power-Supply Trackers/Sequencers/Supervisors EN/UV V EN_R IN1 = 2.5V IN2 = 1.8V IN3 = 0.7V IN_ CAPACITOR- ADJUSTED SLEW RATE OUT_ t DELAY PG/RST = LOW *ANY POWER-DOWN CONDITION BEFORE t Figure 5. Timing Diagram (Aborted Tracking) 8 _______________________________________________________________________________________ EN/UV ...

Page 9

Dual-/Triple-Voltage, Power-Supply EN/UV BUS VOLTAGE MONITORED THROUGH EN/UV INPUT V EN_R IN1 = 2.5V IN2 = 1.8V IN3 = 0.7V IN_ CAPACITOR- ADJUSTED SLEW RATE OUT_ t DELAY PG/RST = LOW *ANY POWER-DOWN CONDITION BEFORE t Figure 6. Timing Diagram ...

Page 10

Dual-/Triple-Voltage, Power-Supply Trackers/Sequencers/Supervisors EN/UV V EN_R OUT2 AND OUT3 ARE WAITING OUT1 IS SLOW OUT_ t DELAY t FAULT FAULT t AND t NOT TO SCALE FAULT RETRY OR IN_ ≥ 2.7V ALL SET_ > 0.5V AND V CC Figure ...

Page 11

Dual-/Triple-Voltage, Power-Supply = 200pF MARGIN = ABP 2.7V to 5.5V, C CC_ SLEW V SUPPLY CURRENT CC vs. INPUT VOLTAGE 1.4 1 +85°C A 1.2 1 +25° ...

Page 12

Dual-/Triple-Voltage, Power-Supply Trackers/Sequencers/Supervisors = 200pF MARGIN = ABP 2.7V to 5.5V, C CC_ SLEW GATE_ VOLTAGE LOW vs. GATE SINK CURRENT 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0 ...

Page 13

Dual-/Triple-Voltage, Power-Supply Trackers/Sequencers/Supervisors PIN MAX6877 MAX6878 MAX6879 1 1 — — — 16, 17, — — ...

Page 14

Dual-/Triple-Voltage, Power-Supply Trackers/Sequencers/Supervisors PIN MAX6877 MAX6878 MAX6879 14 14 — — — 17 — — — — ...

Page 15

Dual-/Triple-Voltage, Power-Supply Trackers/Sequencers/Supervisors IN1 MAX6877 SET1 IN2 COMP SET2 IN3 COMP SET3 V BUS COMP EN/UVLO COMP V REF MARGIN GND ______________________________________________________________________________________ V IN2 IN3 CC IN1 ABP INTERNAL V /UVLO CC RAMP GENERATOR CONTROL LOGIC TRACKING MONITORS DELAY SLEW ...

Page 16

Dual-/Triple-Voltage, Power-Supply Trackers/Sequencers/Supervisors Detailed Description The MAX6877/MAX6878/MAX6879 multivoltage power trackers/sequencers/supervisors monitor up to three system voltages and provide proper power-up and power-down control for systems requiring voltage tracking or sequencing. These devices ensure con- trolled voltage tracking with a specified ...

Page 17

Dual-/Triple-Voltage, Power-Supply During ramp up OUT_ voltage is less than the ref- erence ramp voltage by more than 125mV, the control loop dynamically stops the control ramp voltage from rising until the slow OUT_ voltage catches up. If ...

Page 18

Dual-/Triple-Voltage, Power-Supply Trackers/Sequencers/Supervisors V IN_ IN_ MAX6877 R1 MAX6878 MAX6879 SET_ R2 Figure 9. Setting the Undervoltage (UVLO) Thresholds voltages below the adjusted thresholds to avoid signal- ing an error. The state of PG/RST and FAULT outputs does not change ...

Page 19

Dual-/Triple-Voltage, Power-Supply During fault conditions, an internal pulldown resistor (100Ω) on OUT_ is enabled to help discharge load capacitance (100Ω is connected for fast power-down control). The MAX6877/MAX6878/MAX6879 feature up to three GATE_ outputs to drive up to three external ...

Page 20

Dual-/Triple-Voltage, Power-Supply Trackers/Sequencers/Supervisors When a fault is detected, for a period of t remains off and the 100Ω pulldowns are turned on. After the t period, the device waits t RETRY retries power-up if all power-up conditions are met (see ...

Page 21

Dual-/Triple-Voltage, Power-Supply Trackers/Sequencers/Supervisors IN1 IN2 IN3 V BUS ______________________________________________________________________________________ Typical Application Circuit 0.1µF 0.1µF 0.1µF IN1 IN2 IN3 GATE1 GATE2 SET1 SET2 MAX6877 SET3 EN/ LTCH/RTR ABP SLEW GND TRK/SEQ DELAY TIMEOUT 1µF OUT1 OUT2 OUT3 GATE3 OUT1 ...

Page 22

Dual-/Triple-Voltage, Power-Supply Trackers/Sequencers/Supervisors Ordering Information (continued) PIN- PART TEMP RANGE PACKAGE MAX6878ETG+ -40°C to +85°C 24 Thin QFN MAX6879ETE+ -40°C to +85°C 16 Thin QFN +Denotes lead-free package. TOP VIEW GATE2 19 OUT1 20 GATE1 21 ...

Page 23

Dual-/Triple-Voltage, Power-Supply (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information www.maxim-ic.com/packages.) ______________________________________________________________________________________ Trackers/Sequencers/Supervisors Package Information PACKAGE OUTLINE, 12, 16, 20, 24, 28L THIN QFN, 4x4x0.8mm 1 ...

Page 24

... 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. 24 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2005 Maxim Integrated Products Heaney ...

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