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MIC23099 の電気的特性と機能

MIC23099のメーカーはMicrel Semiconductorです、この部品の機能は「Single AA/AAA Cell Step-Up/Step-Down Regulators」です。


製品の詳細 ( Datasheet PDF )

部品番号 MIC23099
部品説明 Single AA/AAA Cell Step-Up/Step-Down Regulators
メーカ Micrel Semiconductor
ロゴ Micrel Semiconductor ロゴ 




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MIC23099 Datasheet, MIC23099 PDF,ピン配置, 機能
MIC23099
Single AA/AAA Cell Step-Up/Step-Down
Regulators with Battery Monitoring
General Description
The MIC23099 is a high-efficiency, low-noise, dual-output,
integrated power-management solution for single-cell
alkaline or NiMH battery applications. The synchronous
boost output voltage (VOUT1) is enabled first and is
powered from the battery. Next the synchronous buck
output (VOUT2), which is powered from the boost output
voltage, is enabled. This configuration allows VOUT2 to be
independent of battery voltage, thereby allowing the buck
output voltage to be higher or lower than the battery
voltage.
To minimize switching artifacts in the audio band, both the
converters are design to operate with a minimum switching
frequency of 80kHz for the buck and 100kHz for the boost.
The high current boost has a maximum switching
frequency of 1MHz, minimizing the solution footprint.
The MIC23099 incorporates both battery-management
functions and fault protection. The low-battery level is
indicated by an external LED connected to the LED pin. In
addition, a supervisory circuit monitors each output and
asserts a power-good (PG) signal when the sequencing is
done or de-asserted when a fault condition occurs.
Datasheets and support documentation are available on
Micrel’s web site at: www.micrel.com.
Features
VIN range from 0.85V to 1.6V
VOUT1 (step-up) adjustable from 1.8V to 3.3V
VOUT2 (step-down) adjustable from 1.0V to VOUT2
VOUT1/400mW and VOUT2/30mA from a single cell
Minimizes switching noise in the audio band
Step-up regulator with output disconnect in shutdown
VOUT1, above 90% efficiency for 5mA to 200mA
Anti-ringing control circuit to minimize EMI
Turn-on inrush current limiting and soft-start
Automatic output discharge
Low-battery indicator
Power Good (PG) output
Low output ripple < 10mV
Short-circuit and thermal protection
14-pin 2.5mm × 2.5mm × 0.55mm thin QFN (TQFN)
package
• −40°C to +125°C junction temperature range
Applications
Audio headsets
Portable applications
Typical Application
Efficiency (VIN = 1.2V)
vs. Output Current
100
BOOST
VOUT1 = 1.8V
90
BUCK
80 VOUT2 = 1.0V
70
60
50
40
0.001
LED Pin = OPEN
L1 = IFSC1515AHER6R8M01M
L2 = SPM4012T-4R7M
0.01 0.1 0.2
OUTPUT CURRENT (A)
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
May 27, 2014
Revision 1.2

1 Page





MIC23099 pdf, ピン配列
Micrel, Inc.
MIC23099
Pin Description (Continued)
Pin
Number
7
8
9
10
11
12
13
14
EP
Pin Name Pin Function
LED
AGND
FB2
OUT2
PGND2
SW2
OUT1
SW1
GND
LED (Output): This is an open drain output that is used for a low battery indicator. Under normal
conditions, the LED is always ON. If the battery voltage is between 1.2V to 0.85V, the external LED will
blink with a duty cycle of 25% at 0.25Hz. The LED will be OFF if the battery voltage falls below 0.85V for
more than 15 cool-off cycles or the EN pin is low.
Analog Ground: The analog ground for both regulator control loops.
Feedback 2 (Input): Connect a resistor divider network to this pin to set the output voltage for the
synchronous buck regulator. Resistors should be selected based on a nominal VFB2 = 0.6V.
Output Voltage 2 (Input): If the EN is low or the power good output is pulled low, an internal resistor
discharges VOUT2 output capacitance to 0V. Also, if the inductor current falls to zero an internal anti-
ringing switch is connected between the SW2 and OUT2 pins to minimize the switch node ringing.
Power Ground 2: The power ground for the synchronous buck DC/DC converter power stage.
Switch Pin 2 (Input): Inductor connection for the synchronous step-down regulator. Connect the inductor
between VOUT2 and the SW2 pin. Due to the high-speed switching on this pin, the SW2 pin should be
routed away from sensitive nodes and trace length should be kept as short and wide as possible to
reduce EMI. If the inductor current falls to zero or EN is low, then an internal anti-ringing switch is
connected between the SW2 and VOUT2 pins to minimize the switch node ringing.
Output 1 (Output): Output of the synchronous boost regulator and is the bias supply once VOUT1 is
greater than VIN. The boost output also serves as the supply input for the buck converter (VOUT2). If the
EN is low or the power good output is pulled low, an internal resistor discharges VOUT1 output
capacitance to 0V.
Switch Pin 1 (Input): Inductor connection for the synchronous boost regulator. Connect the inductor
between VIN and SW1. Due to the high-speed switching on this pin, the SW1 pin should be routed away
from sensitive nodes and trace length should be kept as short and wide as possible to reduce EMI. If the
inductor current falls to zero, an internal anti-ringing switch is connected between the SW1 and VIN pins
to minimize the switch node ringing.
Exposed Pad (Power): Must make a full connection to a GND plane.
May 27, 2014 3 Revision 1.2


3Pages


MIC23099 電子部品, 半導体
Micrel, Inc.
MIC23099
Electrical Characteristics(7) (Continued)
VIN = VEN = +1.25V; VOUT1 = +1.8V; VOUT2 = 1.0V; LOUT1 = 6.8µH; LOUT2 = 4.7µH; COUT1 = 47µF; COUT2 = 10µF; TA = 25°C, unless
otherwise noted. Bold values indicate –40°C TJ +125°C.
Parameter
Test Conditions
Min. Typ. Max.
Units
Boost
Boost Reference (FB1)
Feedback Regulation Voltage
VIN = 0.9V to 1.5V
PWM Mode
0.579 0.6 0.621
V
FB Bias Current
Soft-Start Time
Boost Internal MOSFETs
VFB1 = 0.6V
VOUT1: 10% to 90% of target value
RLOAD = 500Ω; COUT1 = 47µF
1 500
5
nA
ms
High-Side On-Resistance
Low-Side On-Resistance
Leakage Current into SW1
Anti-Ringing Resistance
ISW1 = 100mA; VIN = 1.25V
ISW1 = -100mA; VIN = 1.25V
VSW = 4.0V, VOUT1 = 0V, VEN = 0V, VIN = 4.0V
200
140
0.01 2
80 140
mΩ
mΩ
µA
Ω
Boost Switching Frequency
Switching Frequency
Minimum Switching Frequency(8)
Minimum Duty Cycle
Maximum Duty Cycle
Boost Current Limit
PWM Mode
POUT1 = 20mW (PFM Mode)
VFB1 = 0.7V
VFB1 = 0.5V
0.9 1.0
100
15
85
1.1
MHz
kHz
%
%
Maximum Output Power
Current-Limit Threshold (NMOS)
Current-Limit Threshold (PMOS)
Linear Mode Current Limit (PMOS)
Boost Power Supply Rejection
VOUT1>1.8V; IOUT2 = 0mA
VFB1 = 0.5V
VFB1 = 0.5V
VIN=1.25V, VOUT1 = 0V
450
1.0 1.5 2.0
1.5 2.5 3.0
56 80 180
mW
A
A
mA
PSRR (ΔVINVOUT1)
PSRR (ΔVINVOUT1)
PSRR (ΔVINVOUT1)
ΔVIN = 200mVp-p, f = 217Hz, IOUT1 = PFM
50 dB
ΔVIN = 200mVp-p, f = 1.0kHz, IOUT1 = PFM 50 dB
ΔVIN = 200mVp-p, f = 20kHz, IOUT1 = PFM
42 dB
May 27, 2014 6 Revision 1.2

6 Page



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部品番号部品説明メーカ
MIC23099

Single AA/AAA Cell Step-Up/Step-Down Regulators

Micrel Semiconductor
Micrel Semiconductor


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