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 Respon • 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 Handts 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 increa 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. Pul Skipping Mode operation increas efficiency at light loads, further extending battery life. Low output voltage ripple and small external inductor and capacitor sizes are a
chieved 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 TYPICAL APPLICATION
BL9328 – X XXXX
Figure 1. BL9328-ADJ Typical Application Circuit
PPMIC BU
2
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 Temperatur
e (Soldering, 10s) ………+300°C
Package Information
Y 9 A B C D Year 2009 2010 2011 2012 2013
W W 01 … 09 10 11 … 51 52 Week 1 … 9 10 11 … 51 52
Thermal Resistance (Note 4)
Package ӨJA ӨJC ESOP-8
天堂瀑布50°C/W
10°C/W
Note 1: Absolute Maximum Ratings are tho 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
杭州宋城
BL9328 Rev 0.3 Belling Proprietary Information. Unauthorized Photocopy and Duplication
Prohibited 3
BL9328
1.5 MHz, Dual 800mA Synchronous Buck Converter
课桌英语Pin Description
NAME FUNCTION
IN1,IN2
Supply Input Pin. Must be cloly decoupled to GND with a 2.2µF or greater
ceramic capacitor.
SW1,SW2 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飘动的反义词
switches.
EN1,EN2 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.
FB1,FB2
Feedback Input Pin. Connect FB to the center point of the external resistor
divider. The regulated voltage on this pin is 0.6V.
GND Power Ground Pin.
Block Diagram
ESOP-8-A
ESOP-8-B
1.5 MHz, Dual 800mA Synchronous Buck Converter
Electrical Characteristics (Note5)
(V IN1 = V IN2=V EN1= V EN2= 3.6V, T A = 25°C, unless otherwi noted.)
韩山师范
Parameter Conditions MIN TYP MAX Unit Input Voltage Range 2.5 5.5 V Input DC Supply Current
Active Mode Shutdown Mode
V FB =0.5V or V OUT =90% V FB =0V, V IN =4.2V
180 0.1 300 1.0 µA T A = +25°C
0.58800.6000 0.6120 T A = 0°C ≤ T A ≤ 85°C 0.58650.6000 0.6135 Regulated Feedback
Voltage T A = -40°C ≤ T A ≤ 85°C
0.5850
0.6000 0.6150
V V FB Input Bias Current V FB = 0.65V ±30 nA Reference Voltage Line
Regulation V IN = 2.5V to 5.5V
0.04
0.4
%/V
Output Overvoltage
Lockout
∆V OVL = V OVL – V FB , Adjustable Version
20 50 80 mV Output Voltage Line
Regulation
V IN = 2.5V to 5.5V
0.04
0.40
%
Output Voltage Load
Regulation 0.5 %
出水才见两腿泥Peak Inductor Current V IN =3V, V FB =0.5V or V OUT =90%
Duty Cycle <35%
1.2 A
Oscillator Frequency V FB =0.6V or V OUT =100% 1.2 1.5 1.8 MHz
R DS(ON) of P-CH MOSFET I SW = 300mA 0.40 0.50 Ω
R DS(ON) of N-CH MOSFET I SW = -300mA
0.35 0.45 Ω SW Leakage Current V RUN = 0V, V SW = 0V or 5V, V IN = 5V
±0.01 ±1 µA EN Threshold -40°C ≤ T A ≤ 85°C
0.3 1.1 1.30 V EN Leakage Current
±0.01
±1
µA
Note 5: 100% production test at +25°C. Specifications over the temperature range are guaranteed by design and characterization.
1.5 MHz, Dual 800mA Synchronous Buck Converter
Typical Performance Characteristics
(Test Figure 1 above unless otherwi specified)
0.1
1
10
100
1000
E f f i c i e n c y (%)
Output Current(mA)Efficiency vs. Output Current
O u t p u t V o l t a g e (V )
Load Current(mA)
Output Voltage vs. Load Current
宪法伴我们成长0.602
0.603
0.604
0.605
0.606
R e f e r e n c e V o l t a g e (V )
Temperature (°C )Reference Voltage vs. Temperature
1.780里番肉番
1.785
1.7901.795
1.8001.8051.8101.815
1.820
V O U T (V )
V IN (V)
Output Voltage vs. Input Voltage
Supply Current vs. Supply Voltage Start_up from Shutdown
D y n a m i c S u p p l y C u r r e n t (u A )
Supply Voltage(V)
