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PDF MAX16050 Data sheet ( Hoja de datos )
| Número de pieza | MAX16050 | |
| Descripción | Voltage Monitors/Sequencer Circuits | |
| Fabricantes | Maxim Integrated Products | |
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19-1013; Rev 0; 11/07
www.DataSheet4U.com
Voltage Monitors/Sequencer Circuits with
Reverse-Sequencing Capability
General Description
The MAX16050 monitors up to 5 voltages and
sequences up to 4 voltages, while the MAX16051 moni-
tors up to 6 voltages and sequences up to 5 voltages.
These devices provide an adjustable delay as each sup-
ply is turned on and they monitor each power-supply
voltage. When all of the voltages reach their final values
and the reset delay timer expires, a power-on-reset
(POR) output deasserts allowing the microcontroller (µC)
to operate. If any voltage falls below its threshold, the
reset output asserts and all voltage supplies are turned
off. The MAX16050/MAX16051 can be daisy-chained to
control a higher number of voltages in a system.
During a power-down event, the MAX16050/MAX16051
can reverse sequence the outputs. In this situation, each
voltage is turned off sequentially until it reaches a 250mV
level, at which point, the next supply is turned off. The
MAX16050/MAX16051 also provide internal pulldown cir-
cuitry that turns on during power-down, to help dis-
charge large output capacitors.
The MAX16050/MAX16051 feature a charge-pump sup-
ply output that can be used as a pullup voltage for dri-
ving external n-channel MOSFETs and an overvoltage
output that indicates when any of the monitored voltages
exceeds its overvoltage threshold. The MAX16050 also
provides three sequence control inputs for changing the
sequence order, while the MAX16051 has a fixed
sequence order.
The MAX16050/MAX16051 are available in a 28-pin
(4mm x 4mm) thin QFN package and are fully specified
over the -40°C to +85°C extended operating tempera-
ture range.
Applications
Servers
Workstations
Networking Systems
Telecom Equipment
Storage Systems
Typical Operating Circuit appears at end of data sheet.
Features
♦ Monitor Up to 6 Voltages/Sequence Up to 5
Voltages
♦ Pin-Selectable Sequencing Order (MAX16050 Only)
♦ Reverse-Sequencing Capability on Shutdown
♦ Overvoltage Monitoring with Independent Output
♦ ±1.5% Threshold Accuracy
♦ 2.7V to 13.2V Operating Voltage Range
♦ Charge Pump to Fully Enhance External
n-Channel FETs
♦ Capacitor-Adjustable Sequencing Delay
♦ Fixed or Capacitor-Adjustable Reset Timeout
♦ Internal 85mA Pulldowns for Discharging
Capacitive Loads Quickly
♦ Daisy-Chaining Capability to Communicate
Across Multiple Devices
♦ Small 4mm x 4mm, 28-Pin TQFN Package
Pin Configurations
TOP VIEW
21 20 19 18 17 16 15
SHDN 22
DELAY 23
TIMEOUT 24
SEQ1 25
SEQ2 26
SEQ3 27
CP_OUT 28
MAX16050
+ *EP
14 EN_HOLD
13 DISC2
12 OUT2
11 SET2
10 DISC3
9 OUT3
8 SET3
1 234567
*EP = EXPOSED PAD
THIN QFN
(4mm x 4mm)
Pin Configurations continued at end of data sheet.
Ordering Information
PART
MONITORED
VOLTAGES
VOLTAGES
SEQUENCED
PIN-PACKAGE
MAX16050ETI+
MAX16051ETI+
5
6
4 28 TQFN-EP*
5 28 TQFN-EP*
Note: All devices are specified over the -40°C to +85°C operating temperature range.
+Denotes lead-free package.
*EP = Exposed pad.
PACKAGE CODE
T2844-1
T2844-1
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
1 page  
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Voltage Monitors/Sequencer Circuits with
Reverse-Sequencing Capability
Typical Operating Characteristics (continued)
(VCC = 5V; VEN = VABP, TA = +25°C, unless otherwise noted.)
OV_OUT LOW VOLTAGE
vs. SINK CURRENT
0.8
0.8
0.7 0.7
0.6 0.6
0.5 0.5
0.4 0.4
0.3 0.3
0.2 0.2
0.1 0.1
0
0 4 8 12 16 20
SINK CURRENT (mA)
0
0
REVERSE SEQUENCE POWER-DOWN USING SHDN
(CDELAY = CTIMEOUT = OPEN)
MAX1650/51 toc12
SHDN
5V/div
V1
5V/div
OUT_ LOW VOLTAGE
vs. SINK CURRENT
4 8 12 16
SINK CURRENT (mA)
RESET LOW VOLTAGE
vs. SINK CURRENT
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
20 0 4 8 12 16
SINK CURRENT (mA)
SIMULTANEOUS POWER-DOWN USING EN
(CDELAY = CTIMEOUT = OPEN)
MAX1650/51 toc13
EN
5V/div
V1
5V/div
20
V2
5V/div
V2
5V/div
V3
5V/div
V3
5V/div
V4
5V/div
40μs/div
DAISY-CHAINING TWO DEVICES
WITH SHDN RISING (FIGURE 7)
MAX1650/51 toc14a
SHDN
V1
V2
V3
V4
V5
V6
V7
100μs/div
CDELAY (U1) = CDELAY (U2) = 100pF
SHDN = 5V/div
V1–V7 = 5V/div
40μs/div
V4
5V/div
DAISY-CHAINING TWO DEVICES
WITH SHDN FALLING (FIGURE 7)
MAX1650/51 toc14b
SHDN
V1
V2
V3
V4
V5
V6
V7
10μs/div
CDELAY (U1) = CDELAY (U2) = 100pF
SHDN = 5V/div
V1–V7 = 5V/div
_______________________________________________________________________________________ 5
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Voltage Monitors/Sequencer Circuits with
Reverse-Sequencing Capability
FAULT
V1
V2
V3
V4
tFAULT-PW
tDELAY
VTH_PL
VTH_PL
RESET
REM
Figure 3. Sequencing Timing Diagram During a System Fault
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet MAX16050.PDF ] | |
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