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BL9310 데이터시트 PDF




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부품번호 BL9310 기능
기능 1A Synchronous Buck Converter
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BL9310 데이터시트, 핀배열, 회로
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 step-
down converter working under an input
voltage range of 2.5V to 5.5V. This feature
makes the BL9310 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 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
www.belling.com.cn
Belling Proprietary Information. Unauthorized Photocopy and Duplication Prohibited
©2011 Belling All Rights Reserved
1




BL9310 pdf, 반도체, 판매, 대치품
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 VOUT=90%
VFB=0V, VIN=4.2V
TA = +25°C
TA= 0°C ≤ TA ≤ 85°C
TA= -40°C ≤ TA ≤ 85°C
VFB Input Bias Current
VFB = 0.65V
Reference Voltage Line
Regulation
Regulated Output Voltage
Output Overvoltage
Lockout
Output Voltage Line
Regulation
Output Voltage Load
Regulation
Peak Inductor Current
Oscillator Frequency
RDS(ON) of P-CH MOSFET
VIN = 2.5V to 5.5V
BL9310-1.2, -40°C ≤ TA ≤ 85°C
BL9310-1.8, -40°C ≤ TA ≤ 85°C
∆VOVL = VOVL – VFB, Adjustable Version
∆VOVL = VOVL – VOUT, Fixed Version
VIN = 2.5V to 5.5V
VIN=3V, VFB=0.5V or VOUT=90%
Duty Cycle <35%
VFB=0.6V or VOUT=100%
ISW = 300mA
RDS(ON) of N-CH MOSFET
ISW = -300mA
2.5
0.5880
0.5865
0.5850
1.164
1.746
20
2.5
1.2
200
0.1
0.6000
0.6000
0.6000
0.04
1.200
1.800
50
7.8
0.04
0.5
1.3
1.5
0.40
0.35
5.5
300
1.0
0.6120
0.6135
0.6150
±30
0.4
1.236
1.854
80
13
0.40
1.8
0.50
0.45
V
µA
µA
V
V
V
nA
%/V
V
V
mV
%
%
%
A
MHz
SW Leakage Current
VRUN = 0V, VSW= 0V or 5V, VIN = 5V
±0.01 ±1
µA
RUN Threshold
-40°C ≤ TA ≤ 85°C
0.3 1.1 1.30 V
RUN 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.
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
4

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BL9310 전자부품, 판매, 대치품
BL9310
1.5 MHz, 1A Synchronous Buck Converter
Operation
The BL9310 uses a constant frequency,
current mode step-down architecture. Both
the main switch (P-channel MOSFET) and
the synchronous rectifier (N-channel
MOSFET) are integrated internally. This
Step-Down DC-DC Converter can supply
600mA output current over a wide input
voltage range from 2.5V to 5.5V. The over
voltage comparator OVDET guards against
transient overshoots >7.8% by turning the
main switch off and keeping it off until the
fault is removed.
Current Mode PWM Control
Slope compensated current mode PWM
control provides stable switching and cycle-
by-cycle current limit for excellent load and
line responses. During normal operation, the
internal main switch is turned on for a certain
time to ramp the inductor current at each
rising edge of the internal oscillator, and
turned off when the peak inductor current
reaches the controlled value. When the main
switch is off, the synchronous rectifier will be
turned on immediately and stay on until either
the inductor current starts to reverse, as
indicated by the current reversal comparator,
IRCMP, or the beginning of the next clock cycle.
Pulse Skipping Mode Operation
At very light loads, the BL9310 will
automatically enter Pulse Skipping Mode to
increase efficiency, further extending battery
life. In this mode, the control loop skips PWM
pulses while maintaining output in regulation,
and the switching frequency depends on the
load condition. This is a kind of PFM mode
operation.
Dropout Operation
When the input voltage decreases toward the
value of the output voltage, the BL9310 will
keep the main switch on for more than one
switching cycle and increases the duty cycle
(Note 5) until it reaches 100%. The output
voltage then is the input voltage minus the
voltage drop across the main switch and the
inductor. At low input supply voltage, the
RDS(ON) of the P-Channel MOSFET increases,
and the efficiency of the converter decreases.
Caution must be exercised to ensure the heat
dissipated not to exceed the maximum
junction temperature of the IC.
Note 6: The duty cycle D of a step-down converter is
defined as:
D
= TON
×
f OSC
×100%
VOUT
VIN
×100%
where TON is the main switch on time, and fOSC
is the oscillator frequency (1.5MHz).
Short Circuit Protection
The BL9310 has short circuit protection.
When output is shorted to ground, the
oscillator frequency is reduced to prevent the
inductor current from increasing beyond the
PFET current limit. The PFET current limit is
also reduced to lower the short circuit current.
The frequency and current limit will return to
the normal values once the short circuit
condition is removed and the feedback
voltage reaches 0.6V.
Maximum Load Current
The BL9310 will operate with input supply
voltage as low as 2.5V, however the
maximum load current decreases at lower
input voltage due to large IR drop on the
main switch and synchronous rectifier.
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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부품번호상세설명 및 기능제조사
BL9310

1A Synchronous Buck Converter

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