BL8091
18V (30V spike) 2A Synchronous PFM/PWM Buck Converter
DESCRIPTION
The BL8091 is a high efficiency current-mode
synchronous, 18V/2A buck converter. Its input
voltage ranges from 4.5V to 18V and it provides
an adjustable regulated output voltage from
0.923V to 15V while delivering up to 2A of output
current.
The internal synchronous switches increase
efficiency and eliminate the need for an external
Schottky diode. The switching frequency is set to
340KHz. And the BL8091 will automatically switch
between PFM and PWM mode based on the load
current, thus to enhance the converter efficiency
at light load.
BL8091 consists of many protection block such as
UVLO, input voltage over voltage protection to
stand much higher input voltage spike, thermal
protection and output short circuit protection.
The BL8091 is available in the SOP8 and ESOP8
(with exposed pad for heat dissipation) package
FEATURES
Adjustable Output Voltage, Vfb=0.923V
Maximum output current is 2A
Range of operation input voltage: Max 18V
Withstand input voltage spike >30V
Standby current: 1mA (typ.)
Operating current at zero load: 1.2mA (typ.)
Line regulation: 0.1%/V (typ.)
Load regulation: 10mV (typ.)
High efficiency, up to 95%
Environment Temperature: -20C~85C
APPLICATIONS
Set-top-box
Consumer Electronic Device for automobile
LCD Monitor and LCD TV
Portable DVD
ADSL Modem, WLAN router
Other 12V or double cell Li-ion battery
powered device
TYPICAL APPLICATION
10uH
PIN OUT
BST
SS
VIN
LC2321
BL8091
EN
0.1uF
BST
10nF
VIN
VIN
EN
100K
SS
VOUT
3.3V/2A
SW
COMP
GND
FB
LC2321
BL8091
10uF
SW
COMP
SOP8 and ESOP8
5.6K
22uF
x2
3.3nF
*Cc optional
GND
FB
10K
26.1K
PFM at Light Load
* When Vin is as low as 5V, Cc is recommended to
be 100pf, but not needed when Vin larger than 5V.
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BELLING [ SHANGHAI BELLING CO., LTD. ]
