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PDF MAX14528 Data sheet ( Hoja de datos )
| Número de pieza | MAX14528 | |
| Descripción | (MAX14527 / MAX14528) Adjustable Overvoltage Protector | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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19-4357; Rev 0; 10/08
www.DataSheet4U.com
Adjustable Overvoltage Protector
with High Accuracy
General Description
The MAX14527/MAX14528 overvoltage protection
devices feature a low 100mΩ (typ) RON internal FET
and protect low-voltage systems against voltage faults
up to +28V. When the input voltage exceeds the over-
voltage threshold, the internal FET is turned off to pre-
vent damage to the protected components.
The overvoltage protection threshold can be adjusted
with optional external resistors to any voltage between
4V and 8V. With the OVLO input set below the external
OVLO select voltage, the MAX14527/MAX14528 auto-
matically choose the internal ±2.5% accurate trip
thresholds. The internal overvoltage thresholds (OVLO)
are preset to 5.75V typical (MAX14527) or 6.76V typical
(MAX14528). The MAX14527/MAX14528 are also
protected against overcurrent events with an internal
thermal shutdown.
The MAX14527/MAX14528 are offered in a small, 8-pin
TDFN-EP package and operate over the -40°C to
+85°C extended temperature range.
Features
♦ Input Voltage Protection Up to +28V
♦ Preset Internal ±2.5% Accurate OVLO Thresholds
5.75V (MAX14527)
6.76V (MAX14528)
♦ Adjustable Overvoltage Protection Trip Level
♦ Integrated 100mΩ (typ) n-Channel MOSFET
Switch
♦ Soft-Start to Minimize In-Rush Current
♦ Automatic Overvoltage Protection Trip-Level
Selection
♦ Internal 15ms Startup Delay
♦ Thermal Shutdown Protection
♦ 8-Pin TDFN (2mm x 2mm) Package
♦ -40°C to +85°C Operating Temperature Range
Applications
Cell Phones
Media Players
PDAs and Palmtop Devices
Pin Configuration appears at end of data sheet.
Ordering Information
PART
PIN-PACKAGE
TOP
MARK
OVLO
(V)
MAX14527ETA+T 8 TDFN-EP*
MAX14528ETA+T 8 TDFN-EP*
ACR
ACS
5.75
6.76
Note: Devices are specified over the -40°C to +85°C tempera-
ture range.
+Denotes a lead-free/RoHS-compliant package.
T = Tape and reel.
*EP = Exposed pad.
Typical Application Circuit
VBUS
USB
CONNECTOR
1µF
R1
* R2
IN OUT
IN OUT
MAX14527
MAX14528
OVLO
GND
CHARGER
INPUT
PMIC
*R1 AND R2 ARE REQUIRED ONLY FOR ADJUSTABLE OVLO; OTHERWISE, CONNECT OVLO TO GND.
________________________________________________________________ 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  
www.DataSheet4U.com
Adjustable Overvoltage Protector
with High Accuracy
Pin Description
PIN NAME
FUNCTION
Voltage Input. Bypass IN with a 1µF ceramic capacitor as close as possible to the device to obtain ±15kV
1, 2 IN Human Body Model (HBM) ESD protection. Connect all the IN pins together for proper operation. IN is
protected to ±2kV HBM when IN is not bypassed with a capacitor to GND.
External OVLO Adjustment. Connect OVLO to GND when using the internal threshold. Connect a resistor-
3 OVLO divider to OVLO to set a different OVLO threshold; this external resistor-divider is completely independent
from the internal threshold.
4, 5 I.C. Internally Connected. Do not connect. Leave I.C. unconnected.
6 GND Ground
7, 8 OUT Output Voltage. Output of internal switch. Connect all the OUT outputs together for proper operation.
—
EP
Exposed Pad. Connect exposed pad to ground. For enhanced thermal dissipation, connect EP to a copper
area as large as possible. Do not use EP as a sole ground connection.
Functional Diagram
IN
IN
OVLO
VBG
REFERENCE
TEMPERATURE
FAULTS
+
-
SEL
GND
MAX14527
MAX14528
CHARGE
PUMP
LOGIC
CONTROL
OUT
OUT
Detailed Description
The MAX14527/MAX14528 overvoltage protection
devices feature a low RON internal FET and protect low-
voltage systems against voltage faults up to +28V. If
the input voltage exceeds the overvoltage threshold,
the internal FET is turned off to prevent damage to the
protected components. The 15ms debounce time pre-
vents false turn-on of the internal FET during startup.
Device Operation
The MAX14527/MAX14528 have timing logic that
controls the turn-on of the internal FET. If VIN <
VOVLO_THRESH, the internal charge pump is enabled.
The charge-pump startup, after a 15ms debounce
delay, turns on the internal FET (see the Functional
Diagram). At any time, if VIN rises above VOVLO_
THRESH, OUT is disconnected from IN.
_______________________________________________________________________________________ 5
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet MAX14528.PDF ] | |
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