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PDF BL9328 Data sheet ( Hoja de datos )
| Número de pieza | BL9328 | |
| Descripción | Dual 800mA Synchronous Buck Converter | |
| Fabricantes | Belling | |
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BL9328
1.5 MHz, Dual 800mA Synchronous Buck Converter
FEATURES
High Efficiency: Up to 96%
1.5MHz Constant Switching Frequency
Current Mode Operation for Excellent
Line and Load Transient Response
No Schottky Diode Required
2.5V to 5.5V Input Voltage Range
Adjustable Output Voltage
100% Duty Cycle in Dropout Mode
Output Current:Up to 800mA per Channel
Low Quiescent Current: 180μA each
Over temperature Protection
Short Circuit Protection
Shutdown Quiescent Current < 1μA
Compact and thermally enhanced
Package:ESOP-8
APPLICATIONS
Cellular and Smart Phones
Wireless Handsets and DSL Modems
Microprocessors and DSP Core Supplies
PDAs
Digital Still and Video Cameras
MP3/MP4/MP5 Players
Portable Instruments
GPS Receivers
DESCRIPTION
The BL9328 is a dual constant frequency,
1.5MHz, slope compensated current mode
PWM step-down converter working under an
input voltage range of 2.5V to 5.5V. This
feature makes the BL9328 suitable for single
cell Li-ion battery-powered applications. The
internal synchronous rectifier is desired to
increase efficiency without an external
Schottky diode. 100% duty cycle capability
extends battery life in portable devices, while
the quiescent current is 180μA at no load,
and drops to < 1μA in shutdown. Pulse
Skipping Mode operation increases efficiency
at light loads, further extending battery life.
Low output voltage ripple and small external
inductor and capacitor sizes are achieved
with 1.5MHz switching frequency. The
BL9328 is offered in a compact and thermally
enhanced ESOP-8 package, and is available
in an adjustable version.
ORDERING INFORMATION
BL9328 – X XXXX
Package：
ESPA: ESOP-8-A
ESPB: ESOP-8-B
Features:
P: Standard (default,
lead free)
C: Customized
TYPICAL APPLICATION
VOUT1
COUT1
10uF
RFB1
RFB2
VIN (2.5-5.5V)
CIN
4.7 uF
L1
2.2uH
CFB1
22pF
IN1 IN2
SW1
SW2
BL9328
FB1 FB2
EN
Control
EN1
EN2
GND
L2
2.2uH
CFB2
22pF
VOUT2
RFB3 COUT2
10uF
RFB4
Figure 1. BL9328-ADJ Typical Application Circuit
PPMIC BU
BL9328 Rev 0.4
11/2012
www.belling.com.cn
Belling Proprietary Information. Unauthorized Photocopy and Duplication Prohibited
© 2010 Belling All Rights Reserved
1
1 page  
BL9328
1.5 MHz, Dual 800mA Synchronous Buck Converter
Typical Performance Characteristics
(Test Figure 1 above unless otherwise specified)
Efficiency vs. Output Current
90 VOUT=1.8V
L=2.2uH
80
70
60
50
40
Vin=2.7V
30 Vin=3.6V
Vin=4.2V
20
0.1 1 10 100 1000
Output Current(mA)
Output Voltage vs. Load Current
2.2
VIN=3.6V
2.1 TA=25C
2.0
1.9
1.8
1.7
1.6
1.5
1.4
1.3
0
200 400 600 800 1000
Load Current(mA)
1200
Reference Voltage vs. Temperature
0.606
VIN=3.6V
0.605
0.604
0.603
0.602
-50
-25
0 25 50 75
TemperatureC
100 125
Supply Current vs. Supply Voltage
245
VOUT=1.8V
240
ILOAD=0A
235 TA=25C
230
225
220
215
210
205
200
195
2
3
4
Supply Voltage(V)
5
6
Output Voltage vs. Input Voltage
1.820
ILOAD=10mA
1.815
ILOAD=100mA
1.810
ILOAD=600mA
1.805
1.800
1.795
1.790
1.785
1.780
2.7 3.0 3.3 3.6 3.9 4.2 4.5 4.8 5.1 5.4 5.7
VIN(V)
Start_up from Shutdown
PPMIC BU
BL9328 Rev 0.4
11/2012
www.belling.com.cn
Belling Proprietary Information. Unauthorized Photocopy and Duplication Prohibited
© 2010 Belling All Rights Reserved
5
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet BL9328.PDF ] | |
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