BELLING BL8529 3a 1.5mhz 5.5v synchronous buck converter Datasheet

BL8529
3A 1.5MHz 5.5V Synchronous Buck Converter
FEATURES
DESCRIPTION
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The BL8529 is a high efficiency synchronous, buck
DC/DC converter. Its input voltage range is from
2.6V to 6V and provides an adjustable regulated
output voltage from 0.8V to 5.5V while delivering
up to 3A 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. The 100% duty cycle provides low
dropout operation extending battery life in
portable systems.
Adjustable Output Voltage, Vfb=0.8V
Maximum output current is 3A
Range of operation input voltage: Max 6V
Standby current: 0.5mA (typ.)
Line regulation: 0.1%/V (typ.)
Load regulation: 10mV (typ.)
High efficiency, up to 96%
Environment Temperature: -20°C~85°C
APPLICATIONS
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The BL8529 is operated in PFM/PWM auto-switch
mode which enhance the efficiency at light-load.
The BL8529 is available in the DFN2x2-8L and
DFN3x3-10L package
TYPICAL APPLICATION
Power Management for 3G modem
3W LED driver from Li-ion battery
LCD Monitor and LCD TV
DVD Decode Board
ADSL Modem
Post Regulators for Switching Supplies
PIN OUT & MARKING
BL852
BL8529
1.EN_
8. COMP
2. GND
7. FB
3. LX
6. VDD
4. PGND
5. PVDD
DFN2x2-8L
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BL8529
ORDERING INFORMATION
Part No.
BL8529CKBTR
BL8529CKATR
Package
Tape&Reel
DFN2x2-8L
DFN3x3-10L
3000/Reel
3000/Reel
ABSOLUTE MAXIMUM RATING
Parameter
Value
Max Input Voltage
Max Operating Junction Temperature(Tj)
Ambient Temperature(Ta)
Package Thermal Resistance
DFN2x2-8L
Storage Temperature(Ts)
Lead Temperature & Time
ESD (HBM)
6V
125°C
-20°C – 85°C
25°C / W
-40°C - 150°C
260°C, 10S
>2000V
Note: Exceed these limits to damage to the device. Exposure to absolute maximum rating conditions may affect
device reliability.
RECOMMENDED WORK CONDITIONS
Parameter
Value
Input Voltage Range
Operating Junction Temperature(Tj)
Max. 6V
-20°C –125°C
ELECTRICAL CHARACTERISTICS
(VDD=5V, TA=25°C)
Symbol
Parameter
VDD
Input Voltage Range
Vref
Feedback Voltage
Ifb
Feedback Leakage current
Iq
Quiescent Current
Conditions
Min
Typ
2.6
0.784
0.8
0.1
Active, Vfb=0.78, No Switching
Shutdown
Max
Unit
5.5
V
0.816
V
0.4
uA
450
uA
1
uA
LnReg
Line Regulation
Vin=4V to 5.5V
0.1
%/V
LdReg
Load Regulation
Iout=1 to 3A
0.02
%/A
600
us
Gm
Fsoc
EA Transconductance
1.35
MHz
RdsonP
PMOS Rdson
Switching Frequency
150
mohm
RdsonN
NMOS Rdson
130
mohm
Ilimit
Peak Current Limit
Ven_
EN_ Shutdown Voltage
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Ren_=180K
3.8
Vin-0.7V
2
A
Vin
BL8529
TYPICAL PERFORMANCE CHARACTERISTICS
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BL8529
TYPICAL PERFORMANCE CHARACTERISTICS cont’
Power On & Soft Start
Load Transient Response
CH2: Output Ripple
CH1: Load Current
CH1: Input Voltage
CH2: Output Voltage
CH3: Switching Wave
CH4: Inductor Current
DETAILED DESCRIPTION
BL8529 is a 3A synchronous buck, with frequency adjusted by Ren_. It can achieve conversion efficiency up to 95%. It
also support 100% duty cycle which will maximize the battery usage. Only a inductor and a few R & C need for peripheral.
The PCB size can be very small
Please note that EN_ pin has to be pull high if one wants to shutdown the chip. And
nd release it (with a Ren_ connected to
GND) to have it work. One can also switch off BL8529 by connect enable signal with at least 1mA driving capability to
VDD pin (pin 6 of DFN2x2 and pin 8 of DFN3x3 package).
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BL8529
PACKAGE OUTLINE
Package
DFN2x2-8L
Package specification:
Devices per reel
3000
Unit
mm
Package
DFN3x3-10L
Package specification:
Devices per reel
3000
Unit
mm
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