BL9328
1.5 MHz, Dual 800mA Synchronous Buck Converter
FEATURES
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•
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•
•
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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
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.
APPLICATIONS
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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
ORDERING INFORMATION
BL9328 – X XXXX
Package：
ESPA: ESOP-8-A
ESPB: ESOP-8-B
Features:
P: Standard (default,
lead free)
C: Customized
TYPICAL APPLICATION
Figure 1. BL9328-ADJ Typical Application Circuit
PPMIC BU
BL9328 Rev 0.3
6/2010
www.belling.com.cn
Belling Proprietary Information. Unauthorized Photocopy and Duplication Prohibited
©2010 Belling All Rights Reserved
1
BL9328
1.5 MHz, Dual 800mA Synchronous Buck Converter
Absolute Maximum Rating
(Note1)
Input Supply Voltage(IN1,IN2)………-0.3V to +6V
EN1,EN2,V
FB1
,V
FB2
Voltages………-0.3V to +V
IN
SW1,SW2 Voltages……………-0.3V to (V
IN
+0.3V)
P-Channel Switch Source Current (DC) ………1A
N-Channel Switch Sink Current (DC) …………1A
Peak SW Sink and Source Current……………1.4A
Operating Temperature Range……-40°C to +85°C
Junction Temperature
(Note2)
………………+125°C
Storage Temperature Range………-65°C to +150°C
Lead Temperature (Soldering, 10s) ………+300°C
Package Information
ESOP-8-A
IN1
1
9
GND
8
7
6
5
FB1
EN1
FB2
EN2
IN1
1
9
GND
ESOP-8-B
8
7
6
5
EN1
FB1
EN2
FB2
SW1 2
IN2
SW2
3
4
SW1 2
IN2
SW2
3
4
Part Number
BL9328
Top Mark
BL9328
A Y W W
(Note3)
Temp Range
-40°C to +85°C
Part Number
BL9328
Top Mark
BL9328
B Y W W
(Note3)
Temp Range
-40°C to +85°C
Y
Year
WW
Week
9
2009
01
1
A
2010
…
…
B
2011
09
9
C
2012
10
10
D
2013
11
11
…
…
51
51
52
52
Thermal Resistance
(Note 4)
Package
ESOP-8
Ө
JA
50°C/W
Ө
JC
10°C/W
Note 1:
Absolute Maximum Ratings are those values beyond which the life of a device may be impaired.
Note 2:
T
J
is calculated from the ambient temperature T
A
and power dissipation P
D
according to the following formula:
T
J
= T
A
+ (P
D
) x (50°C/W).
Note 3:
A B: Package Type (A: ESOP-8-A, B: ESOP-8-B) Y: Year of wafer manufacturing W W: Week of wafer
manufacturing
Note 4:
Thermal Resistance is specified with approximately 1 square of 1 oz copper.
PPMIC BU
BL9328 Rev 0.3
6/2010
www.belling.com.cn
Belling Proprietary Information. Unauthorized Photocopy and Duplication Prohibited
©2010 Belling All Rights Reserved
2
BL9328
1.5 MHz, Dual 800mA Synchronous Buck Converter
Pin Description
NAME
IN1,IN2
SW1,SW2
EN1,EN2
FB1,FB2
GND
FUNCTION
Supply Input Pin. Must be closely decoupled to GND with a 2.2µF or greater
ceramic capacitor.
Power Switch Output. It is the switch node connection to external inductor. This
pin connects to the drains of the internal P-Channel and N-Channel MOSFET
switches.
Regulator Enable Control Input. Drive EN above 1.5V to turn on the part. Drive
EN below 0.3V to turn it off. In shutdown, all functions are disabled drawing
<1µA supply current. Do not leave EN floating.
Feedback Input Pin. Connect FB to the center point of the external resistor
divider. The regulated voltage on this pin is 0.6V.
Power Ground Pin.
Block Diagram
ESOP-8-A
ESOP-8-B
PPMIC BU
BL9328 Rev 0.3
6/2010
www.belling.com.cn
Belling Proprietary Information. Unauthorized Photocopy and Duplication Prohibited
©2010 Belling All Rights Reserved
3
BL9328
1.5 MHz, Dual 800mA Synchronous Buck Converter
Electrical Characteristics
Parameter
(Note5)
(V
IN1
= V
IN2
=V
EN1
= V
EN2
= 3.6V, T
A
= 25°C, unless otherwise noted.)
Conditions
MIN
2.5
180
0.1
0.6000
0.6000
0.6000
TYP
MAX
5.5
300
1.0
0.6120
0.6135
0.6150
±30
0.04
20
50
0.04
0.5
V
IN
=3V, V
FB
=0.5V or V
OUT
=90%
Duty Cycle <35%
V
FB
=0.6V or V
OUT
=100%
I
SW
= 300mA
I
SW
= -300mA
V
RUN
= 0V, V
SW
= 0V or 5V, V
IN
= 5V
-40°C
≤
T
A
≤
85°C
0.3
1.2
1.2
1.5
0.40
0.35
±0.01
1.1
±0.01
1.8
0.50
0.45
±1
1.30
±1
0.4
80
0.40
Unit
V
µA
Input Voltage Range
Input DC Supply Current
Active Mode
V
FB
=0.5V or V
OUT
=90%
Shutdown Mode
V
FB
=0V, V
IN
=4.2V
T
A
= +25°C
Regulated Feedback
T
A
= 0°C
≤
T
A
≤
85°C
Voltage
T
A
= -40°C
≤
T
A
≤
85°C
V
FB
Input Bias Current
Reference Voltage Line
Regulation
Output Overvoltage
Lockout
Output Voltage Line
Regulation
Output Voltage Load
Regulation
Peak Inductor Current
Oscillator Frequency
R
DS(ON)
of P-CH MOSFET
R
DS(ON)
of N-CH MOSFET
SW Leakage Current
EN Threshold
EN Leakage Current
V
FB
= 0.65V
V
IN
= 2.5V to 5.5V
∆V
OVL
= V
OVL
– V
FB
, Adjustable Version
V
IN
= 2.5V to 5.5V
0.5880
0.5865
0.5850
V
nA
%/V
mV
%
%
A
MHz
Ω
Ω
µA
V
µA
Note 5:
100% production test at +25°C. Specifications over the temperature range are guaranteed by design and
characterization.
PPMIC BU
BL9328 Rev 0.3
6/2010
www.belling.com.cn
Belling Proprietary Information. Unauthorized Photocopy and Duplication Prohibited
©2010 Belling All Rights Reserved
4
BL9328
1.5 MHz, Dual 800mA Synchronous Buck Converter
Typical Performance Characteristics
(Test Figure 1 above unless otherwise specified)
Efficiency vs. Output Current
2.2
Output Voltage vs. Load Current
2.1
2.0
90
80
70
60
50
40
30
20
0.1
V
OUT
=1.8V
L=2.2uH
V
IN
=3.6V
T
A
=25
°
C
Output Voltage(V)
Vin=2.7V
Vin=3.6V
Vin=4.2V
1
10
100
1000
Efficiency(%)
1.9
1.8
1.7
1.6
1.5
1.4
1.3
0
200
400
600
800
1000
1200
Output Current(mA)
Load Current(mA)
Reference Voltage vs. Temperature
0.606
1.820
Output Voltage vs. Input Voltage
I
LOAD
=10mA
I
LOAD
=100mA
I
LOAD
=600mA
V
IN
=3.6V
1.815
Reference Voltage(V)
0.605
1.810
1.805
1.800
1.795
0.604
0.603
V
OUT
(V)
-25
0
25
50
75
100
125
1.790
1.785
0.602
-50
1.780
2.7
3.0
3.3
3.6
3.9
4.2
4.5
4.8
5.1
5.4
5.7
Temperature
(°
C
)
V
IN
(V)
Supply Current vs. Supply Voltage
245
240
Start_up from Shutdown
Dynamic Supply Current(uA)
235
230
225
220
215
210
205
200
195
V
OUT
=1.8V
I
LOAD
=0A
T
A
=25
°
C
2
3
4
5
6
Supply Voltage(V)
PPMIC BU
BL9328 Rev 0.3
6/2010
www.belling.com.cn
Belling Proprietary Information. Unauthorized Photocopy and Duplication Prohibited
©2010 Belling All Rights Reserved
5
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