BL8526
2A 1.4M 5.5V Synchronous Buck Converter
DESCRIPTION
The BL8526 is a high efficiency
synchronous buck regulator. The device
operates from an input voltage range of
3.6V to 5.5V and provides an output
voltage from 0.8 to 5V 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 by an external
resistor or can be synchronized to an
external clock. While switching frequency
is set to 1.4MHz, BL8526 can allow the
use of small external components, such
as ceramic input and output caps, as well
as small inductors, while still providing
low output ripples.
100% duty cycle provides low dropout
operation extending battery life in
portable systems.
FEATURES
Range of Input Voltage: 3.6V~5.5V
1μA Shutdown Current
100% Duty Cycle
High Efficiency: 92%
No Schottky Diode Required.
3.5A Current Limit
0.8V Reference for Low Output
Voltage
Operating Temp. Range: -20°
C~85°
C
Demo Board Available
APPLICATIONS
Cellular phones
Digital Cameras
MP3 and MP4 players
Set top boxes
Wireless and DSL Modems
USB supplied Devices in Notebooks
Portable Devices
TYPICAL APPLICATION
2.2uH
Vout / 3.3V
Vin
NC
PVDD
10uF
LX
GND
LC2123
BL8526
RT
VDD
COMP
FB
10K
5.6K
180K
3.3nF
31K
10uF
www.belling.com.cn
1
BL8526
PACKAGE/ORDER INFORMATION
8
7
6
5
ORDER PART NUMBER
SOP8
GE|
LLSYW
1
2
3
4
BL8526CD8TR
PIN DESCRIPTION
Pin No.
1
2
3
4
5
6
7
8
Symbol
N.C
PVDD
LX
GND
FB
COMP
VDD
RT
Description
Not Connected
Power Supply for internal power switch
Switching Node: PWM output connection to inductor.
Ground Pin
Pin for Feedback Voltage
Compensation Pin
Power Supply for internal control circuit
Oscillator Resistor Input Pin
ABSOLUTE MAXIMUM RATING
Parameter
Max Input Voltage
CE Pin Voltage
FB Pin Voltage
Max Operating Junction Temperature(Tj)
Ambient Temperature(Ta)
Storage Temperature(Ts)
Lead Temperature & Time
ESD (HBM)
Thermal resistance: Θ
JA
Value
5.5V
–0.3V to Vin+0.3V
–0.3V to Vin+0.3V
125C
-40C – 85C
-40C - 150C
260C, 10S
>2000V
150°
C/W
www.belling.com.cn
2
BL8526
ELECTRICAL CHARACTERISTICS
(Test condition is in 25º VIN=5V)
C,
Symbol
VDD
Vref
Ifb
Iq
LnReg
LdReg
Fsoc
RdsonP
RdsonN
Ilimit
Iswlk
Ienlk
Vh_en
Vl_en
Parameter
Input Voltage Range
Feedback Voltage
Feedback Leakage
current
Quiescent Current
Active, Vfb=0.65,
No Switching
Shutdown
Vin=4V to 5.5V
Iout=0.1to 2A
Conditions
Min
3.6
0.784
Typ
0.8
0.1
450
1
0.1
0.02
1.4
150
130
3.8
10
1
VIN-
0.6
VIN-
0.8
Max
5.5
0.816
0.4
Unit
V
V
uA
uA
uA
%/V
%/A
MHz
mohm
mohm
A
uA
uA
V
V
Line Regulation
Load Regulation
Switching
R3=180K
Frequency
PMOS Rdson
NMOS Rdson
Peak Current Limit
SW Leakage
Vout=5.5V, VSW=0
Current
or 5.5V, EN=0V
EN Leakage Current
EN Input High
Voltage
EN Input Low
Voltage
DEMO BOARD BOM
No.
1
2
3
4
5
6
7
8
9
Reference
C1
C2
C3
L1
U1
R1
R2
R3
R4
Type
Capacitor
Capacitor
Capacitor
Inductor
IC
Resistor
Resistor
Resistor
Resistor
Specification
MLCC 10uF; SMD 0805
MLCC 10uF; SMD 0805
MLCC 3.3nF; SMD 0805
2.2uH; 3A; SMD, Shielding
BL8526; SMD SO-8
10K;SMD 0805; 1%
31K;SMD 0805; 1%
180K;SMD 0805; 1%
5.6K;SMD 0805; 5%
Note
If VOUT is 1.0V,
R2 is 2.5K
www.belling.com.cn
3
BL8526
APPLICATION INFORMATION
Layout is critical to achieve clean and stable operation. The switching power stage
requires particular attention. Follow these guidelines for good PC board layout:
1) Place decoupling capacitors as close to the IC as possible
2) Connect input and output capacitors to the same power ground node with a star ground
configuration then to IC ground.
3) Keep the high-current paths as short and wide as possible.
4) If possible, connect VDD,LX, and GND separately to a large copper area to help cool the
IC to further improve efficiency and long-term reliability.
5) Ensure all feedback connections are short and direct. Place the feedback resistors as
close to the IC as possible.
6) Route high-speed switching nodes away from sensitive analog areas
VIN
R3
1
2
C1
3
4
8
7
6
5
R1
L1
C2
R2
To VIN
R4
C3
www.belling.com.cn
5
Microchip MCU
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
