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PDF MIC23099 Data sheet ( Hoja de datos )
| Número de pieza | MIC23099 | |
| Descripción | Single AA/AAA Cell Step-Up/Step-Down Regulators | |
| Fabricantes | Micrel Semiconductor | |
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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  
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.
Fault Conditions
VIN and VOUT1, 2 Fault Conditions
VIN Turn Off Threshold Voltage
PG Deglitch Delay, VIN Fault
PG Deglitch Delay, VOUT1, 2 Fault
Cool OFF Delay Time
Hiccup Cycles before Latch OFF
VIN Falling; after Start Up
VIN Falling below 0.85V to VPG = LOW
VOUT1 or VOUT2 falling below 90% of target
value to VPG = LOW
VPG = Low to VOUT1 Enabled
COUT1 = 47µF; COUT2 = 10µF
Counts Cool OFF cycles
0.825
120
60
0.85
750 1300
15
OUT1 Active Discharge Resistance
OUT2 Active Discharge Resistance
Power Good Output (PG)
VEN = 0V
VEN = 0V
500
500
PG Threshold Voltage
PG Threshold Voltage
PG Output Low Voltage
PG Leakage Current
PG Turn-On Delay
VREF1 Rising or Falling
VREF2 Rising or Falling
IPG = 1mA (sinking), VEN = 0V
VPG = 1.8V; VEN = 1.8V
90 92.5
90 92.5
0.1
−1 0.01
10
LED Low-Battery Indicator Output (LED)
Low-Battery Threshold
Low-Battery Hysteresis
LED Flash Frequency
LED Flash Duty Cycle
LED Output Leakage Current
LED Switch On-Resistance
Thermal Protection
VIN Falling
VIN Rising
VIN = 1.15V; VEN = 1.15V
VIN = 1.15V; VEN = 1.15V
VLED = 4.0V; VEN = 0V
VIN = VEN = 1.25V; ILED = 1.0mA
1.15 1.2
0.125
22.5
0.25
25
0.01
Thermal Shutdown
Thermal Hysteresis
TJ Rising
Temperature Decreasing
150
20
Max.
0.875
180
120
2250
700
700
95
95
0.5
1
50
1.25
31
0.5
27.5
1
25
Units
V
ms
ms
ms
Cycles
Ω
Ω
%VREF1
%VREF2
V
μA
ms
V
mV
Hz
%
μA
Ω
°C
°C
May 27, 2014 5 Revision 1.2
5 Page 
Micrel, Inc.
Typical Characteristics (Continued)
LED Flash Duty-Cycle
vs. Input Voltage
0.5
0.4
0.3
FLASHING
0.2
VOUT1 = 1.8V
IOUT1 = 0A
TA = 25°C
50%
40%
30%
20%
LED Flash Duty-Cycle
vs. Temperature
0.1
0
0.8
CONSTANT ON
1.0 1.2 1.4 1.6
INPUT VOLTAGE (V)
10%
VIN = 1.1V
0%
-50 -25
0 25 50 75 100 125
TEMPERATURE (°C)
LED Flash Frequency
vs. Input Voltage
0.5
VOUT1 = 1.8V
0.4
IOUT1
TA =
= 0.A
25⁰C
0.3
FLASHING
0.2
0.1
0.0
0.8
CONSTANT ON
1.0 1.2 1.4 1.6
INPUT VOLTAGE (V)
LED Flash Frequency
vs. Temperature
0.5
0.4
0.3
0.2
0.1 VIN = 1.1V
0.0
-50 -25
0
25 50 75 100 125
TEMPERATURE (°C)
VOUT1 Fault Delay
vs. Temperature
200
150
100
50
VIN = 1.2V
0
-50
-25 0
25 50 75
TEMPERATURE (°C)
100 125
VOUT2 Fault Delay
vs. Temperature
200
150
100
50
VIN = 1.2V
0
-50
-25
0 25 50 75 100 125
TEMPERATURE (°C)
MIC23099
1.25
1.24
1.23
1.22
1.21
1.20
1.19
1.18
1.17
1.16
1.15
-50
Low-BatteryThreshold
vs. Temperature
RISING
FALLING
IOUT = 0A
-25 0 25 50 75
TEMPERATURE (°C)
100 125
VIN Fault Delay
vs. Temperature
250
200
150
100
VOUT1 = 1.8V
IOUT1 = 0A
50
0
-50 -25
0 25 50 75 100 125
TEMPERATURE (°C)
Cool OFF Delay
vs. Temperature
2,000
1,500
1,000
500
VIN = 1.2V
0
-50 -25
0 25 50 75 100 125
TEMPERATURE (°C)
May 27, 2014 11 Revision 1.2
11 Page | ||
| Páginas | Total 26 Páginas | |
| PDF Descargar | [ Datasheet MIC23099.PDF ] | |
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