MAX8535EUA+ Maxim Integrated Products, MAX8535EUA+ Datasheet

IC CNTRLR ORING MOSFET 8-MSOP

MAX8535EUA+

Manufacturer Part Number
MAX8535EUA+
Description
IC CNTRLR ORING MOSFET 8-MSOP
Manufacturer
Maxim Integrated Products
Datasheet

Specifications of MAX8535EUA+

Applications
Network/Telecom Power Supplies, Rectifiers
Fet Type
N-Channel
Number Of Outputs
1
Internal Switch(s)
No
Delay Time - Off
200ns
Voltage - Supply
8 V ~ 14 V
Current - Supply
2mA
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Delay Time - On
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Critical loads often employ parallel-connected power
supplies with redundancy in order to enhance system
reliability. The MAX8535/MAX8536/MAX8585 are highly
integrated but inexpensive MOSFET controllers that pro-
vide isolation and redundant power capability in high-reli-
ability systems. The MAX8535/MAX8585 are used in 12V
systems, and have an internal charge pump to drive the
gates of the n-channel pass elements to V
MAX8536 is used in 3.3V and 5V systems, with a charge-
pump output of V
During startup, the MAX8535/MAX8536/MAX8585 moni-
tor the voltage drop across external MOSFETs. Once
V
MOSFETs are turned on. The MAX8535/MAX8536/
MAX8585 feature a dual-purpose TIMER input. A single
external resistor from TIMER to ground sets the turn-on
speed of the external MOSFETs. Optionally, the TIMER
input can be used as a logic-enable pin. Once the
device is turned on, the MAX8535/MAX8536/MAX8585
monitor the load, protecting against overvoltage, under-
voltage, and reverse-current conditions.
Overvoltage and undervoltage fault thresholds are
adjustable and can be disabled. The current-limit trip
points are set by the external MOSFETs’ R
reducing component count. An open-drain logic-low
fault output indicates if an overvoltage, undervoltage, or
reverse-current fault occurs.
All devices come in a space-saving 8-pin µMAX
package and are specified over the extended -40°C to
+85°C temperature range.
µMAX is a registered trademark of Maxim Integrated Products, Inc.
19-2735; Rev 1; 3/04
Pin Configuration, Functional Diagrams, and Typical
Application Circuits appear 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.
CC
approaches or exceeds the bus voltage, the
Silver Box Supplies for Servers
On-Board Redundant Power Supplies in Blade
Servers
Network/Telecom Power Supplies
Rectifiers
Redundant Power Supplies in High-Availability
Systems
Fault Isolation for Redundant Power Supplies
CC
________________________________________________________________ Maxim Integrated Products
+ 5V.
ORing MOSFET Controllers with Fastest
General Description
Applications
CC
+ 10V. The
DS(ON)
®
,
♦ Simple, Integrated, and Inexpensive ORing
♦ ORing MOSFET Drive for 12V
♦ Eliminates ORing Diode Power Dissipation and
♦ Provides N + 1 Redundant Supply Capability for
♦ Isolates Failed Supply from Output Bus in <1µs
♦ Reverse-Current Flow Detection
♦ Programmable Soft-Start
♦ Logic-Enable Input
♦ Adjustable Overvoltage and Undervoltage Trip
♦ Fault-Indicator Output
♦ Space-Saving 8-Pin µMAX Package
MAX8535EUA
MAX8535AEUA
MAX8536EUA
MAX8585EUA
MOSFET Controller
(MAX8535/MAX8585) and 3.3V or 5V
(MAX8536) Bus
Reverse Leakage Current
Highly Reliable Systems
Points
SILVER BOX
RECTIFIERS
PART
OR
OUT+
OUT-
Typical Operating Circuit
Ordering Information
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
TEMP RANGE
V
TIMER
CC
MAX8535
MAX8536
MAX8585
GATE
GND
CS
FAULT
UVP
OVP
(MAX8536),
(MAX8535)
OUTPUT:
PIN-PACKAGE
8 µMAX
8 µMAX
8 µMAX
8 µMAX
3.3V/5V
12V
Features
N.C.
+V
O
-V
O
1

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MAX8535EUA+ Summary of contents

Page 1

... All devices come in a space-saving 8-pin µMAX package and are specified over the extended -40°C to +85°C temperature range. µMAX is a registered trademark of Maxim Integrated Products, Inc. Silver Box Supplies for Servers On-Board Redundant Power Supplies in Blade Servers ...

Page 2

ORing MOSFET Controllers with Fastest Fault Isolation for Redundant Power Supplies ABSOLUTE MAXIMUM RATINGS GATE to GND (MAX8535/MAX8535A/MAX8585)...-0.3V to +28V V to GND (MAX8535/MAX8535A/MAX8585) .....-0.3V to +18V CC FAULT to GND CS, (MAX8535/MAX8535A/MAX8585) ......................-0.3V to +15V GATE to GND (MAX8536) ...

Page 3

ORing MOSFET Controllers with Fastest Fault Isolation for Redundant Power Supplies ELECTRICAL CHARACTERISTICS (continued 12V (MAX8535/MAX8535A/MAX8585 0.01µ 0°C to +85°C, unless otherwise noted.) A PARAMETER SYMBOL Charge-Pump Switching Frequency TIMER TIMER Voltage TIMER ...

Page 4

ORing MOSFET Controllers with Fastest Fault Isolation for Redundant Power Supplies ELECTRICAL CHARACTERISTICS (continued 12V (MAX8535/MAX8535A/MAX8585 0.01µ 0°C to +85°C, unless otherwise noted.) A PARAMETER SYMBOL Startup Reverse-Current Blank Time Forward-Current Threshold OVERVOLTAGE ...

Page 5

ORing MOSFET Controllers with Fastest Fault Isolation for Redundant Power Supplies ELECTRICAL CHARACTERISTICS (continued 12V (MAX8535/MAX8535A/MAX8585 0.01µ -40°C to +85°C, unless otherwise noted.) (Note 1) A PARAMETER SYMBOL CHARGE-PUMP VOLTAGE Gate Voltage TIMER ...

Page 6

ORing MOSFET Controllers with Fastest Fault Isolation for Redundant Power Supplies ELECTRICAL CHARACTERISTICS (continued 12V (MAX8535/MAX8535A/MAX8585 0.01µ -40°C to +85°C, unless otherwise noted.) (Note 1) A PARAMETER SYMBOL OVERVOLTAGE PROTECTION OVP Fault Threshold ...

Page 7

ORing MOSFET Controllers with Fastest Fault Isolation for Redundant Power Supplies CS + 0.01V 0.03V LATCH SHARE 500ms I BLANKING REVERSE I FORWARD I REVERSE ...

Page 8

ORing MOSFET Controllers with Fastest Fault Isolation for Redundant Power Supplies (V = 12V 25k , UVP = 2V, OVP = 1V TIMER GATE-CHARGE CURRENT vs. TIMER RESISTANCE ( + ...

Page 9

ORing MOSFET Controllers with Fastest Fault Isolation for Redundant Power Supplies MAX8535 Typical Operating Characteristics (continued 12V 25k , UVP = 2V, OVP = 1V TIMER TIMER-ENABLED STARTUP AND SHUTDOWN WAVEFORMS (V = 12V, ...

Page 10

ORing MOSFET Controllers with Fastest Fault Isolation for Redundant Power Supplies (V = 12V 25k , UVP = 2V, OVP = 1V TIMER GATE-CHARGE CURRENT vs. TIMER RESISTANCE ( + ...

Page 11

ORing MOSFET Controllers with Fastest Fault Isolation for Redundant Power Supplies MAX8536 Typical Operating Characteristics (continued 12V 25k , UVP = 2V, OVP = 1V TIMER TIMER-ENABLED STARTUP AND SHUTDOWN WAVEFORMS (V = 5V, ...

Page 12

ORing MOSFET Controllers with Fastest Fault Isolation for Redundant Power Supplies PIN NAME 1 GATE Gate Drive Output. Bypass GATE with a 0.01µF capacitor to ground. 2 GND Ground 3 V Power-Supply Input. Bypass V CC Undervoltage Input. Connect a ...

Page 13

ORing MOSFET Controllers with Fastest Fault Isolation for Redundant Power Supplies for the MAX8536 is 12µA. Increasing the charge-pump frequency increases the GATE drive current. Adding a resistor from GATE to the gate of the external MOSFETs further increases turn-on ...

Page 14

ORing MOSFET Controllers with Fastest Fault Isolation for Redundant Power Supplies Normally, the external MOSFET’s gate capacitance is sufficient to serve as a reservoir capacitor. If the MOSFETs are located at a significant distance from the MAX8535/MAX8536/MAX8585, place a local ...

Page 15

ORing MOSFET Controllers with Fastest Fault Isolation for Redundant Power Supplies V V FAULT TIMER Figure 1. MAX8535/MAX8585 Functional Diagram V V FAULT TIMER Figure 2. MAX8536 Functional Diagram ______________________________________________________________________________________ GATE V CHARGE CC PUMP 400mV 30mV* CLK SHUTDOWN VOLTAGE ...

Page 16

ORing MOSFET Controllers with Fastest Fault Isolation for Redundant Power Supplies OUT+ 53.6k SILVER BOX OR RECTIFIERS 10k OUT- Figure 3. Typical Application Circuit for 12V/20A Output with OVP and UVP OUT+ 13.3k SILVER BOX OR RECTIFIERS 10k OUT- Figure ...

Page 17

ORing MOSFET Controllers with Fastest Fault Isolation for Redundant Power Supplies OUT+ SILVER BOX C1 OR 0.01 F, RECTIFIERS 50V C2 0.1 F, 16V OUT- Figure 5. Typical Application Circuit for 12V/20A Output without OVP and UVP ______________________________________________________________________________________ Q1 SUB75N03-04 ...

Page 18

ORing MOSFET Controllers with Fastest Fault Isolation for Redundant Power Supplies V+ V CCA OUT+ R3A 53.6k SILVER BOX A R4A 10k OUT- V CCB OUT+ R3B 53.6k SILVER BOX B R4B 10k OUT- Figure Redundant ...

Page 19

ORing MOSFET Controllers with Fastest Fault Isolation for Redundant Power Supplies Pin Configuration TOP VIEW GATE 1 8 GND 2 7 MAX8535 MAX8536 UVP 4 MAX8585 5 MAX ______________________________________________________________________________________ TRANSISTOR COUNT: 3011 PROCESS: BiCMOS CS FAULT ...

Page 20

... 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. 20 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2004 Maxim Integrated Products 4X S ...

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