|
|
PDF MAX6399 Data sheet ( Hoja de datos )
| Número de pieza | MAX6399 | |
| Descripción | Protection Switch Controller | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de MAX6399 (archivo pdf) en la parte inferior de esta página. Total 10 Páginas | ||
|
No Preview Available !
19-3655; Rev 1; 3/06
High-Voltage, Overvoltage/Undervoltage,
Protection Switch Controller
General Description
The MAX6399 is a small overvoltage and undervoltage
protection circuit. The device can monitor a DC-DC out-
put voltage and quickly disconnect the power source
from the DC-DC input load when an overvoltage condi-
tion occurs. A power-OK output signals when the
DC-DC input voltage falls below an adjustable thresh-
old. This controller architecture provides the ability to
size the external n-channel MOSFET to meet specific
load current requirements.
When the DC-DC monitored output voltage is below the
user-adjustable overvoltage threshold, the GATE output
of the MAX6399 goes high to enhance the n-channel
MOSFET. The MAX6399 offers internal charge-pump
circuitry that allows the GATE voltage to be 10V above
the input voltage (VGS = 10V) to fully enhance the
external n-channel MOSFET, thus minimizing the drain-
to-source resistance.
When the monitored output voltage rises above the
user-adjusted overvoltage threshold, the GATE output
rapidly pulls low to shut off the MOSFET. The MOSFET
remains latched off until either the MAX6399 input
power or SHDN input is cycled. The MAX6399 includes
a logic-low shutdown input that disables the GATE. An
internal overtemperature detector also disables the
gate when the MAX6399 temperature reaches the ther-
mal-shutdown threshold.
The device operates over a wide supply voltage range
(5.75V to 72V) and is offered in a small TDFN package,
fully specified from -40°C to +125°C.
Applications
Networking
Server
Telecom
RAID
Pin Configuration
TOP VIEW
8765
MAX6399
*EP
12 34
Features
♦ Wide Supply Voltage Range (5.75V to 72V)
♦ Internal Charge Pump Ensures n-Channel
MOSFET is Fully Enhanced During Normal
Operation (VGS = 10V)
♦ Fast GATE Shutoff During Overvoltage with 20mA
Sink Capability
♦ Latches Off External n-Channel MOSFET During
High-Voltage Transients
♦ Adjustable DC-DC Input Undervoltage Threshold
Power-OK Output
♦ Adjustable DC-DC Output Overvoltage
Thresholds
♦ Overtemperature Shutdown Protection
♦ Fully Specified from -40°C to +125°C
Ordering Information
PART
PIN-PACKAGE
MAX6399ATA-T 8 TDFN-8
TOP
MARK
ANE
PKG
CODE
T833-2
Typical Operating Circuit
12V IN GATE
OUT
MAX6399
SHDN
OUT_SET
SET
POK GND
DC-DC
CONVERTER
IN OUT
EN GND
LOAD
3.3V
TDFN
*EXPOSED PAD. CONNECT TO GND.
________________________________________________________________ Maxim Integrated Products 1
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.
Free Datasheet http://www.datasheet4u.com/
1 page  
High-Voltage, Overvoltage/Undervoltage,
Protection Switch Controller
Pin Description
PIN NAME
FUNCTION
1 IN Supply Voltage Input. Bypass with a 10µF capacitor (minimum).
Shutdown Input. Drive SHDN low to force GATE low, turning off the external n-channel MOSFET. SHDN is
2 SHDN internally pulled down to GND with a 1µA current source. Toggle SHDN to unlatch GATE after an
overvoltage condition. Connect to IN for normal operation.
Overvoltage Threshold Adjustment Input. Use SET to monitor a system output voltage. Connect SET to an
3 SET external resistor voltage-divider network to adjust the desired overvoltage limit threshold. GATE is quickly
turned off when SET rises above its 0.5V (typ) threshold.
4 POK Power-OK Open-Drain Output. POK asserts low when OUT_SET falls below its 1.23V (typ) threshold.
5 GND Ground
Gate-Drive Output. Connect GATE to the gate of an external n-channel FET. GATE is a charge pump with a
6
GATE
100µA pullup current to IN + 10V (typ) during normal operation. GATE is quickly turned off during an
overvoltage condition. GATE remains latched off until the power is recycled or SHDN is toggled. GATE pulls
low when SHDN is low.
7 OUT Output Voltage-Sense Input. Connect to the source of the external n-channel MOSFET.
Undervoltage Detector Input. Use OUT_SET to monitor the source of the MOSFET. Connect a
8 OUT_SET resistor-divider from OUT to OUT_SET to adjust the desired undervoltage threshold. POK asserts low
when OUT_SET falls below its 1.23V threshold.
— EP Exposed Pad. Connect to ground plane.
IN
UVLO
5V
SET
0.5V
MAX6399
1.23V
OUT_SET
Figure 1. Functional Diagram
THERMAL
PROTECTION
CHARGE
PUMP
GATE
OUT
SHDN
POK
GND
Detailed Description
The MAX6399 is an ultra-small, low-current protection
circuit utilized in DC-DC converter applications. The
MAX6399 monitors the input and output voltages of a
DC-DC converter for undervoltage and overvoltage
conditions. The MAX6399 controls an external n-chan-
nel MOSFET to isolate the load during an overvoltage
condition. The device allows system designers to size
the external n-channel MOSFET to their load current
and board size.
The MAX6399 drives the MOSFET’s gate high when the
monitored DC-DC output voltage is below the program-
mable overvoltage threshold, programmed through
SET. An internal charge-pump circuit provides a guar-
anteed 10V gate-to-source drive to ensure low input-to-
load voltage drops in normal operating modes. When
the monitored DC-DC output voltage rises above the
user-adjusted overvoltage threshold, GATE latches low,
turning off the MOSFET. The MOSFET remains off until
the power is recycled or by toggling SHDN.
The MAX6399 also monitors for an undervoltage condi-
tion at the input of the DC-DC converter through
OUT_SET. An active-high, open-drain, power-good out-
put can be used to drive the EN input, notifying the sys-
tem when the monitored voltage is below the adjusted
undervoltage voltage threshold.
_______________________________________________________________________________________ 5
Free Datasheet http://www.datasheet4u.com/
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet MAX6399.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| MAX639 | 5V/3.3V/3V/Adjustable / High-Efficiency / Low IQ / Step-Down DC-DC Converters | Maxim Integrated |
| MAX6390 | (MAX6381 - MAX6390) Low-Power uP Reset Circuits |  Maxim Integrated Products |
| MAX6391 | (MAX6391 / MAX6392) Dual Voltage uP Supervisory Circuits | Maxim Integrated Products |
| MAX6392 | (MAX6391 / MAX6392) Dual Voltage uP Supervisory Circuits | Maxim Integrated Products |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |