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參數資料
| 型號： | MAX6878ETG+T |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | Dual-/Triple-Voltage, Power-Supply Trackers/Sequencers/Supervisors |
| 中文描述： | 2-CHANNEL POWER SUPPLY SUPPORT CKT, QCC24 |
| 封裝： | 4 X 4 MM, 0.80 MM HEIGHT, LEAD FREE, MO220WGGD-2, TQFN-24 |
| 文件頁數： | 1/24頁 |
| 文件大小： | 470K |
| 代理商： | MAX6878ETG+T |
General 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 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
100
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.
Applications
Multivoltage Systems
Networking Systems
Telecom
Storage Equipment
Servers/Workstations
Features
Pin-Selectable Tracking or Sequencing Control
for Up to Three Supply Voltages
Capacitor-Adjustable Power-Up/Down Tracking
Slew Rate
Capacitor-Adjustable Power-Up Sequencing Delay
Internal Charge Pumps to Enhance External
n-Channel FETs
Capacitor-Adjustable Timeout Period Power-Good
Output (MAX6877/MAX6878)
Adjustable Undervoltage Lockout or
Logic-Enable Input
Internal 100 Pulldown for Each Output to
Discharge Capacitive Load Quickly
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
Packages
MAX6877/MAX6878/MAX6879
Dual-/Triple-Voltage, Power-Supply
Trackers/Sequencers/Supervisors
________________________________________________________________ Maxim Integrated Products
1
23
24
22
21
8
7
9
ABP
SET2
SET1
EN/UV
10
V
CC
GATE3
FAULT
PG/RST
OUT2
MARGIN
12
IN3
45
6
17
18
16
14
13
IN2
IN1
TIMEOUT
*EXPOSED PADDLE CONNECTED TO GND.
SLEW
DELAY
GND
EP*
+
MAX6877
SET3
OUT3
3
15
GATE1
20
11
LTCH/RTR
OUT1
19
12
TRK/SEQ
GATE2
4mm x 4mm THIN QFN
TOP VIEW
Pin Configurations
Ordering Information
19-3771; Rev 1; 10/05
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.
Ordering Information continued at end of data sheet.
+Denotes lead-free package.
EVALUATION
KIT
AVAILABLE
Selector Guide appears at end of data sheet.
PART
TEMP RANGE
PIN-
PACKAGE
PKG
CODE
MAX6877ETG+
-40°C to +85°C
24 Thin QFN
T2444-4
Pin Configurations continued at end of data sheet.
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相關代理商/技術參數 |
參數描述 |
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| MAX6879ETE | 功能描述:監控電路 RoHS:否 制造商:STMicroelectronics 監測電壓數: 監測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復位:Resettable 監視器:No Watchdog 電池備用開關:No Backup 上電復位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| MAX6879ETE+ | 功能描述:監控電路 Dual Power-Sup Sequencer RoHS:否 制造商:STMicroelectronics 監測電壓數: 監測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復位:Resettable 監視器:No Watchdog 電池備用開關:No Backup 上電復位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| MAX6879ETE+T | 功能描述:監控電路 Dual Power-Sup Sequencer RoHS:否 制造商:STMicroelectronics 監測電壓數: 監測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復位:Resettable 監視器:No Watchdog 電池備用開關:No Backup 上電復位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| MAX6879ETE-T | 功能描述:監控電路 RoHS:否 制造商:STMicroelectronics 監測電壓數: 監測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復位:Resettable 監視器:No Watchdog 電池備用開關:No Backup 上電復位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| MAX687CPA | 功能描述:低壓差穩壓器 - LDO High-Accuracy LDO RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調節:0.3 % 輸出端數量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
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