MAX5927, MAX5929 Low-Voltage, Quad, Hot-Swap Controllers/Power Sequencers

Description

The MAX5927/MAX5929 +1V to +13.2V quad hot-swap controllers provide complete protection for multisupply systems. They allow the safe insertion and removal of circuit cards into live backplanes. These devices hot swap multiple supplies ranging from +1V to +13.2V, provided one supply is at or above +2.7V and only one supply is above +11.0V. The input voltage rails (channels) can be configured to sequentially turn-on/off, track each other, or have completely independent operation.

The discharged filter capacitors of the circuit card provide low impedance to the live backplane. High inrush currents from the backplane to the circuit card can burn up connectors and components, or momentarily collapse the backplane power supply leading to a system reset. The MAX5927/MAX5929 hot-swap controllers prevent such problems by gradually ramping up the output voltage and regulating the current to a preset limit when the board is plugged in, allowing the system to stabilize safely. After the startup cycle is complete, on-chip comparators provide VariableSpeed/BiLevel™ protection against short-circuit and overcurrent faults, and provide immunity against system noise and load transients. The load is disconnected in the event of a fault condition. The MAX5929A automatically restarts after a fault condition, while the MAX5929L must be unlatched. The MAX5927 fault management mode is selectable.

The MAX5927/MAX5929 offer a variety of options to reduce external component count and design time. All devices integrate an on-board charge pump to drive the gates of low-cost external N-channel MOSFETs, an adjustable startup timer, and an adjustable current limit. The devices offer integrated features like startup current regulation and current glitch protection to eliminate external timing resistors and capacitors. The MAX5929_L provides an open-drain active-low status output for each channel, the MAX5929_H provides an open-drain active-high status output for each channel, and the MAX5927 status output polarity is selectable.

The MAX5927 is available in a 32-pin thin QFN package and the MAX5929 is available in a 24-pin QSOP package. All devices are specified over the extended temperature range, -40°C to +85°C.

Key Features

Applications/Uses

Safe Hot Swap for +1V to +13.2V Power Supplies with Any Input Voltage (V_{IN_} > 2.7V and Only One V_{IN_} > 11.0V)
Adjustable Circuit Breaker/Current-Limit Threshold from 25mV to 100mV
Configurable Tracking, Sequencing, or Independent Operation Modes
VariableSpeed/BiLevel Circuit-Breaker Response
Internal Charge Pumps Generate N-Channel MOSFET Gate Drives
Inrush Current Regulated at Startup
Autoretry or Latched Fault Management
Programmable Undervoltage Lockout
Status Outputs Indicate Fault/Safe Condition

	Base-Station Line Cards
	Bays (Docking Stations)
	Hot Plug-In Daughter Cards
	Hubs
	Network Routers and Switches
	PCI Express® Hot Plug
	Portable Computer Device
	Power-Supply
	RAID
	Sequencing/Tracking

Key Specifications: Hot Swap Controllers

Part Number

Min. V_IN (V)

Max. V_IN (V)

Low Voltage

High Voltage

Voltage Polarity

Type

Fault Condition Control

Number of Channels

Features

Package

MAX5927

13.2

Yes

Positive

Positive, Low-Voltage

Programmable Latched Off or Periodic Retry

•	25mV Circuit Breaker Threshold

•	50mA Gate Pull Down Current During Short Circuit Protection

•	Adjustable Auto-Retry Duty Cycle and Over-Current Timeout

•	Configurable Tracking, Sequencing, or Independent Operation Modes

•	Independent ON/OFF Control for Each Channel

TQFN/32

MAX5929

Latched Off
Periodic Retry

•	25mV Circuit Breaker Threshold

•	50mA Gate Pull Down Current During Short Circuit Protection

•	Auto-Retry Fault Management

•	Configurable Tracking, Sequencing, or Independent Operation Modes

•	Fault Status Output

•	In-Rush Current and Short Circuit Protection

•	Independent ON/OFF Control for Each Channel

•	Latch or Auto-Restart Fault Management

•	Power-Good Output (Active-High)

•	Power-Good Output (Active-Low)

QSOP/24

See All Hot Swap Controllers (46)

Ordering Information

Notes:

Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions.
* Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.

Devices: 1-10 of 10

MAX5927

Free
Sample

Buy

Package:	TYPE PINS FOOTPRINT
	DRAWING CODE/VAR *

Temp

RoHS/Lead-Free?
Materials Analysis

MAX5927ETJ

TQFN;32 pin;26 mm²
Outline Drawing: 21-0140 (PDF)
Land Pattern: 90-0012 (PDF)
Use pkgcode/variation: T3255-4*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX5927ETJ-T

Land Pattern: Not Available

-40°C to +85°C

See data sheet

MAX5927ETJ+T

TQFN;32 pin;26 mm²
Outline Drawing: 21-0140 (PDF)
Land Pattern: 90-0012 (PDF)
Use pkgcode/variation: T3255+4*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX5927ETJ+

TQFN;32 pin;26 mm²
Outline Drawing: 21-0140 (PDF)
Land Pattern: 90-0012 (PDF)
Use pkgcode/variation: T3255+4*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX5929

Free
Sample

Buy

Package:	TYPE PINS FOOTPRINT
	DRAWING CODE/VAR *

Temp

RoHS/Lead-Free?
Materials Analysis

MAX5929LHEEG+

QSOP;24 pin;54 mm²
Outline Drawing: 21-0055 (PDF)
Land Pattern: 90-0172 (PDF)
Use pkgcode/variation: E24+1*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX5929LHEEG+T

QSOP;24 pin;54 mm²
Outline Drawing: 21-0055 (PDF)
Land Pattern: 90-0172 (PDF)
Use pkgcode/variation: E24+1*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX5929LLEEG

QSOP;24 pin;54 mm²
Outline Drawing: 21-0055 (PDF)
Land Pattern: 90-0172 (PDF)
Use pkgcode/variation: E24-1*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX5929LHEEG-T

Land Pattern: Not Available

-40°C to +85°C

See data sheet

MAX5929LHEEG

QSOP;24 pin;54 mm²
Outline Drawing: 21-0055 (PDF)
Land Pattern: 90-0172 (PDF)
Use pkgcode/variation: E24-1*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX5929LLEEG-T

Land Pattern: Not Available

-40°C to +85°C

See data sheet