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PDF BL8598 Data sheet ( Hoja de datos )
| Número de pieza | BL8598 | |
| Descripción | Adjustable Overvoltage Protector | |
| Fabricantes | BELLING | |
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BL8598
Adjustable Overvoltage Protector with High Accuracy
DESCRIPTION
The BL8598 overvoltage protection devices
feature a low 180 (typ) RON internal FET and
safeguards 2.2V to 28V systems from power
supply overvoltage. If the input voltage exceeds
the overvoltage threshold, the internal FET is
turned off to prevent the output load circuits
from damage.
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
BL8598 automatically choose the internal ±2.5%
accurate trip thresholds. The internal overvoltage
thresholds (OVLO) are preset to 6.75V typical.
The BL8598 includes an internal thermal
shutdown circuit which can protect against
overcurrent events.
FEATURES
Overvoltage Protection up to 28V
±2.5% Accurate 6.75V OVLO Threshold
Adjustable Overvoltage Protection Trip Level
Integrated 180 n-Channel MOSFET Switch
Automatic Overvoltage Protection Trip-Level
Selection
Internal 15ms Startup Delay
Thermal Shutdown Protection
Available in DFN2x2-8L Package
Temperature Range: -40C~85C
APPLICATIONS
Cell Phones
MP3 and MP4 players
PDAs and Palmtop Devices
BL8598 is available in DFN2x2-8L package.
TYPICAL APPLICATION
PIN OUT
BL8598
R1 and R2 are required only for adjustable OVLO;
otherwise, connect OVLO to GND.
DFN2x2-8L
*Connect exposed PAD to GND.
www.belling.com.cn
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BL8598
DETAILED DESCRIPTION
BL8598 overvoltage protection devices feature a
low 180
(typ) RON internal FET and
safeguards 2.2V to 28V systems from power
supply overvoltage. If the input voltage exceeds
the overvoltage threshold, the internal FET is
turned off to prevent the output load circuits
from damage. The 15ms debounce time
guarantees proper turn on of the internal FET
during startup.
Device Operation
On initial power up, if VIN > VOVLO_THRESH, VOUT is
disconnected from VIN. If VIN < VOVLO_THRESH, the
internal charge pump is enabled, the device enters
startup after a 15ms debounce delay.
Internal Switch
BL8598 incorporate an internal FET with a 180
RON. The FET is internally driven by a charge pump
that generates a necessary gate voltage above VIN.
The internal FET is capable of passing more than 5A
inrush current.
Overvoltage Lockout(OVLO)
BL8598 has a 6.75V OVLO threshold.
Thermal Shutdown Protection
BL8598 has a thermal shutdown circuitry to turn off
the internal FET when the junction temperature
exceeds
. The FET will recover automatically
when the junction temperature falls by .
APPLICATION INFORMATION
VIN Bypass Capacitor
A 10uF ceramic capacitor is typically recommended
for CIN. CIN should be located as close to the device
VIN pin as practically possible. If the power source
has significant inductance due to long lead length,
take care to prevent overshoots due to the LC tank
circuit and provide protection if necessary to
prevent exceed- ing the +30V absolute maximum
rating on VIN.
Output Capacitor
A 10uF output capacitor is required at the output.
External OVLO Adjustment Functionality
If OVLO is connected to ground, the internal OVLO
comparator uses the internally set OVLO value.
If OVLO is connected to the external resistor divider,
and VOVLO exceeds the OVLO select voltage,
VOVLO_SELECT, the internal OVLO comparator is
programmed with two resistors, R1 and R2. A
suggested value for R1 is
for minimum
current consumption. In the case of
and since VIN_OVLO, VOVLO_THRESH, R2 can be
approximated by the following formula:
This external resistor divider is completely
independent from the internal resistor divider.
www.belling.com.cn
5
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet BL8598.PDF ] | |
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