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BL9310
1.5 MHz, 1A 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 • 1.0V,1.2V,1.5V,1.8V,2.5V and 3.3V
Fixed/Adjustable Output Voltage • 100% Duty Cycle in Dropout Mode • Low Quiescent Current: 200µA • Over temperature Protection • Short Circuit Protection • Shutdown Quiescent Current < 1µA • Space Saving 5-Pin Thin SOT23 Package
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
ORDERING INFORMATION
BL9310 –XX X XXX
:Package
TRN: TSOT23-5 RN: SOT23-5
Features: P: Standard (default,
lead free) C: Customized
:Output Voltage
10: 1.0V 12: 1.2V 15: 1.5V 18: 1.8V 25: 2.5V 33: 3.3V AD: Adjustable
• Portable Instruments • GPS Receivers
DESCRIPTION
The BL9310 is a constant frequency, 1.5MHz, slope compensated current mode PWM stepdown converter working under an input voltage range of 2.5V to 5.5V. This feature makes the BL9310 suitable for single cell Liion 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 200µA at no load, and drops to < 1µA in shutdown. Pulse Skipping Mode operation increases efficiency at light loads, further extending battery life. The BL9310 is offered in a low profile (1mm) 5-pin, thin SOT23 package, and is available in an adjustable version and fixed output versions of 1.0V, 1.2V, 1.5V , 1.8V, 2.5V and 3.3V.
TYPICAL APPLICATION
Figure 1. BL9310-ADJ Typical Application Circuit
PPMIC BU BL9310 Rev 1.1 1/2011
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BL9310
1.5 MHz, 1A Synchronous Buck Converter
Absolute Maximum Rating (Note 1)
Input Supply Voltage…………………-0.3V to +6V RUN, VFB Voltages……………………-0.3V to +VIN SW Voltages……………………-0.3V to (VIN+0.3V) P-Channel Switch Source Current (DC) ……1.1A N-Channel Switch Sink Current (DC) ……1.1A
Package Information
Adjustable Output Version
Peak SW Sink and Source Current……………1.5A 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
Fixed Output Versions
SOT23-5
TOP VIEW
RUN 1
5 VFB
GND 2
SOT23-5
TOP VIEW
RUN 1
5 VOUT
GND 2
MARKING MARKING
SW 3
4 VIN
SW 3
4 VIN
Part Number BL9310-Adj
Top Mark I J Y W(Note3)
Temp Range -40°C to +85°C
Thermal Resistance (Note 4)
Package TSOT23-5
ӨJA 220°C/W
ӨJC 110°C/W
SOT23-5
250°C/W
130°C/W
Part Number BL9310-1.0 BL9310-1.2 BL9310-1.5 BL9310-1.8 BL9310-2.5 BL9310-3.3
Top Mark IAYW IBYW ICYW IDYW IEYW IFYW
Temp Range -40°C to +85°C
Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired.
Note 2: TJ is calculated from the ambient temperature TA and power dissipation PD according to the following formula: TJ = TA + (PD) x (220°C/W).
Note 3: I: Product Code Y: Year of Manufacturing W: Week of Manufacturing Note 4: Thermal Resistance is specified with approximately 1 square of 1 oz copper.
PPMIC BU BL9310 Rev 1.1 1/2011
www.belling.com.cn Belling Proprietary Information. Unauthorized Photocopy and Duplication Prohibited
©2011 Belling All Rights Reserved
2
BL9310
1.5 MHz, 1A Synchronous Buck Converter
Pin Description
PIN NAME
FUNCTION
Regulator Enable Control Input. Drive RUN above 1.5V to turn on the part.
1 RUN Drive RUN below 0.3V to turn it off. In shutdown, all functions are disabled
drawing <1µA supply current. Do not leave RUN floating.
2 GND Ground
Power Switch Output. It is the switch node connection to external inductor. This
3 SW pin connects to the drains of the internal P-Channel and N-Channel MOSFET
switches.
4
VIN
Supply Input Pin. Must be closely decoupled to GND, Pin 2, with a 2.2µF or greater ceramic capacitor.
VFB (BL9310-Adj): Feedback Input Pin. Connect FB to the center point of the external resistor divider. The regulated voltage on this pin is 0.6V.
5 VFB/VOUT VOUT (BL9310-1.2/BL9310-1.5/BL9310-1.8): Output Voltage Feedback Pin. An internal resistive divider divides the output voltage down for comparison to the
internal reference voltage.
Block Diagram
PPMIC BU BL9310 Rev 1.1 1/2011
www.belling.com.cn Belling Proprietary Information. Unauthorized Photocopy and Duplication Prohibited
©2011 Belling All Rights Reserved
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BL9310
1.5 MHz, 1A Synchronous Buck Converter
Electrical Characteristics (Note 5)
(VIN =VRUN= 3.6V, TA = 25°C, unless otherwise noted.)
Parameter
Conditions
MIN TYP MAX Unit
Input Voltage Range
Input DC Supply Current
Active Mode Shutdown Mode
Regulated Feedback Voltage
VFB=0.5V or.