FAN4855MU [FAIRCHILD]
500mA High Efficiency Boost Regulator with Adjustable Output, Shutdown and Low Battery Detect; 500毫安高效率升压型稳压器可调节输出，关机和低电池电压检测
| 型号： | FAN4855MU |
| 厂家： | 
FAIRCHILD SEMICONDUCTOR |
| 描述： | 500mA High Efficiency Boost Regulator with Adjustable Output, Shutdown and Low Battery Detect |
| 文件： | 总13页 (文件大小：149K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
www.fairchildsemi.com
FAN4855
500mA High Efficiency Boost Regulator with
Adjustable Output, Shutdown and Low Battery Detect
Features
General Description
• Low power PFM boost regulator
The FAN4855 is a low power boost regulator designed for
low voltage DC to DC conversion in 2-cell battery powered
systems such as digital cameras, cell phones and PDAs.
The converter starts-up at 1.3V and operates after the start at
an input voltage as low as 1V. Output voltage can be adjusted
by external resistors from 3.3V to 5V with a maximum load
current of 0.5A. Quiescent current in shut-down mode is
less than 10µA, which maximizes the battery live time. The
ON time changes with the input voltage to maintain the
ripple current constant and to provide the highest efficiency
over a wide load range—while maintaining low peak
currents in the boost inductor. The combination of built-in
power transistors, synchronous rectification and low supply
current, make the FAN4855 ideal for portable applications.
The FAN4855 is available in 8-lead MSOP and TSSOP
packages.
• Input voltage range is from 1.6V to 4.5V
• Output voltage range is from 3V to 5V
• 500mA maximum load current capability
• 95% efficient power conversion
• 2-3 cell and single cell Li-Ion systems
• Variable on-time Pulse Frequency Modulation (PFM)
• Internal synchronous rectifier (no need for external diode)
• Low-battery detection
• Logic controlled shutdown with true-load disconnect
• Low (80µA) quiescent current
• MSOP-8 and TSSOP-8 Packages
Applications
• DSCs
• PDAs
• Cell phones, smart phones
• Portable instrumentations
• 2-3 AA / AAA cells operated devices
• Single cell Li-Ion operated devices
Typical Application
Input 1.6V
to 4.5V
FAN4855
VIN
GND
VL
1
2
3
4
8
On
7
6
5
Off
SHDN
LBI
Output 3.3V to 5V
up to 0.5A
Low Battery
Detect In
Low Battery
Detect Out
VOUT
FB
LB0
REV. 1.0.0 3/17/04
PRODUCT SPECIFICATION
FAN4855
Pin Configuration
8-Pin TSSOP and MSOP
VIN
1
2
3
4
8
7
6
5
GND
VL
SHDN
LBI
VOUT
FB
LB0
TOP VIEW
Pin Description
PIN NAME
FUNCTION
Battery Input Voltage. Supplies the IC during start-up. After the output is running, the IC draws
power from VOUT
SHDN Shut Down. Pulling this pin low shuts down the regulator, isolating the load from the input.
1
VIN
.
2
3
4
LBI
Low-Battery Input. Pulling this pin below 0.39V causes the LBO pin to go low.
LBO
Low-Battery Output. This pin provides an active low signal to alert the user when the LBI
voltage falls below its targeted value. The open-drain output can be used to reset a
microcontroller.
5
6
FB
Feedback Input. For setting the output voltage. Connect this pin to the resistor divider.
VOUT Boost regulator output. Output voltage can be set to be in the 3 to 5V range. Startup at
moderate load is achievable at input voltages around 1.35V.
7
8
VL
Boost inductor connection. Connect an inductor between this pin and VIN. When servicing the
output supply, this pin pulls low, charging the inductor, then shuts off dumping the energy through
the synchronous rectifier to the output.
GND
Ground of the IC.
Absolute Maximum Ratings
Absolute Maximum Ratings are those values, beyond which the device could be permanently damaged. Absolute maximum
ratings are stress ratings only and functional device operation is not implied.
Parameter
Min.
-0.3
-0.3
-0.3
Max.
Units
VIN, VOUT Voltages (Relative to GND)
Switch Voltage (VL to GND)
Voltage on any other Pin
Peak Switch Current (Ipeak)
6.5
V
V
V
VOUT + 0.3
VOUT + 0.3
— Internally Limited —
Output Current (IOUT
)
500
525
315
124
206
150
150
300
mA
Continuous Power Dissipation
TSSOP Package
MSOP Package
TSSOP Package
MSOP Package
mW
Thermal Resistance (θJA
)
°C/W
Junction Temperature
°C
°C
°C
Storage Temperature Range
-65
Lead Temperature (soldering, 10s)
2
REV. 1.0.0 3/17/04
FAN4855
PRODUCT SPECIFICATION
Recommended Operating Conditions
Parameter
Min.
-40
1.6
Max.
Units
°C
Temperature Range
VIN Operating Range
VOUT Operating Range
+85
0.9 VOUT
5.0
V
3.0
V
Electrical Characteristics
Unless otherwise specified, VIN = 1.6V to 3V, ILOAD = 1mA, TA = -40°C to +85°C. Test Circuit Fig.1. Typical values
are at TA = +25°C
Parameter
Conditions
Min.
Typ.
1.35
1.0
Max. Units
Start Up Voltage
Operating Voltage
ILOAD < 1mA
1.6
V
V
After start ILOAD =10mA, VOUT = 3.3V or
5V
Output Voltage
V
OUT(nom.) = 3.3V (Note 1)
3.15
4.775
3.3
5
3.45
5.225
V
V
VOUT(nom.) = 5V
Output Voltage Adjust Range
Steady State Output Current
3
5
V
mA
mA
µs
µs
µs
µs
µs
%
VOUT = 3.3V, VIN = 2.5V
VOUT = 5V, VIN = 2.5V
VIN = 3V
300
200
0.8
1.2
1.6
1.7
500
330
1.4
1.7
2.2
2.5
1
Pulse Width
2
VIN = 2.4V
2.5
3.3
4.0
VIN = 1.8V
VIN = 1.6V
Minimum Off-Time
Line Regulation
IOUT = 2mA, VOUT = 3.3V
VOUT = 5V
0.5
0.5
0.5
1
2
2
%
Load Regulation
0 to 250mA, VIN = 2.4V, VOUT = 3.3V
0 to 150mA, VIN = 2.4V, VOUT = 5V
%
%
Feedback Voltage (VFB)
LBI Threshold Voltage
LBI Hysteresys
1.243
0.390
25
V
V
mV
Ω
Internal NFET, PFET ON Resist. ILOAD = 100mA
0.35
95
Power Efficiency
ILOAD = 200mA, VIN = 3V, VOUT = 3.3V
%
Input Current in Shut Down
Mode
SHDN = 0V, VIN = 3V (Note 2)
8
50
µA
Quiescent Current
SHDN = 3V, VIN = 3V, VOUT = 3.3V
(Note 2)
80
160
µA
LBO Output Voltage Low
V
LBI = 0, ISINK = 1mA
0.2
1.5
0.8
V
V
V
SHDN Input Threshold Voltage
SHDN Input Threshold Voltage
VIN = 3V, VOUT = 3.3V/5V
VIN = 1.6V, VOUT = 3.3V/5V
Notes:
1. R4, R5, R6 tolerance ≤ 0.1%.
2. Current through R1, R2 is not taken into account.
REV. 1.0.0 3/17/04
3
PRODUCT SPECIFICATION
FAN4855
VIN
2
1
10uH
1.6V to 3.0V
R1
750K
FAN4855
U1
JP2
JP3
1
2
3
4
8
7
6
5
Vin
Gnd
SHDN
J1
2
1
SHDN
LBI
VL
SCOPE JACK
Vout
Reset
2
1
LBO
FB
C3
18pF
R4
402K
+
C1
47µF
VOUT
R2
240K
R3
100K
1
2
JP1
3.3V or 5V
Ext
Pull Up
+
2
1
C2
47µF
C5
0.1µF
R6
287K
R5
240K
GND1
GND
2
1
1
2
Figure 1. Test Circuit
4
REV. 1.0.0 3/17/04
FAN4855
PRODUCT SPECIFICATION
Typical Operating Characteristics (L = 10µH, CIN = 47µF, COUT = 47µF/1.0µF, T = 25°C)
Load Current vs. Start-Up Voltage
(Resistive Load)
Efficiency vs. Load Current
Vout = 3.3V
100.0
90.0
80.0
70.0
60.0
50.0
40.0
30.0
20.0
10.0
0.0
600
500
400
300
200
100
0
Vin=3V
Vin=2.0V
V
= 3.3V
OUT
Vin=1.5V
V
OUT
= 5V
0.1
1
10
Output Current, mA
100
1000
1.5
2
2.5
3
3.5
4
Input Voltage, V
Efficiency vs. Load Current
Vout = 5V
SHDN Threshold Voltage
100.0
90.0
80.0
70.0
60.0
50.0
40.0
30.0
20.0
10.0
0.0
2.3
2.1
1.9
1.7
1.5
1.3
1.1
0.9
0.7
0.5
Vin=3V
Vin=1.5V
Vin=2.0V
0.1
1
10
Output Current, mA
100
1000
1.5
2
2.5
3
3.5
4
4.5
Input Voltage, V
Starting Up and Turning Off
= 3.3V, Iloads = 10mA to 50mA
Starting Up and Turning Off
V
V
= 5V, Iloads = 10mA to 50mA
OUT
OUT
4
3.5
3
5
4
3
2
1
0
START UP
TURN OFF:
Iload=50mA
START UP
Iload=10mA to 50mA
Iload=50mA
Iload=10mA
2.5
2
Iload=10mA
1.5
1
TURN OFF:
0.5
0
0.6
0.8
1.0
1.2
1.4
1.6
1.8
0.6
0.8
1.0
1.2
1.4
1.6
1.8
Input Voltage, V
Input Voltage, V
REV. 1.0.0 3/17/04
5
PRODUCT SPECIFICATION
FAN4855
Typical Operating Characteristics (L = 10µH, CIN = 47µF, COUT = 47µF/1.0µF, T = 25°C)
No Load Supply Current vs. Input Voltage
Output Voltage vs. Temperature
1000
100
10
0.2
0
V
= 5V
OUT
“ON”
V
= 3.3V
OUT
-0.2
-0.4
-0.6
“OFF”
1
0.1
0
1
2
3
4
5
-50
-25
0
25
50
75
100
Input Voltage (V)
Temperature (°C)
6
REV. 1.0.0 3/17/04
PRODUCT SPECIFICATION
FAN4855
Typical Operating Characteristics (Continued)
Exiting Shutdown
Line Transient Response @100mA Load
VOUT
VSHDN
Load Transient Response
Load Transient Response
Inductor Current and Switching Node Voltage
Heavy-Load Switching Waveforms
VL
Inductor
Current
IL
VL
VOUT
7
REV. 1.0.0 3/17/04
PRODUCT SPECIFICATION
FAN4855
Block Diagram
LBO
4
VL
7
SHDN
2
Control
Logic
LBI
3
1
–
+
A3
0.39V
SHDN
ILIMIT
Q
2
VOUT
VIN
Synchronous
Rectifier
Control
Start-Up
VOUT
+
–
6
A2
Minimum
Off-Time
Logic
Current
Limit
Control
ILIMIT
V
FB
5
Variable
On-Time
One Shot
N
1
Q
1
–
ILIMIT
SHDN
A1
+
VREF
8
GND
When the one–shot times out, the Q1 transistor releases the
VL pin, allowing the inductor to fly-back and momentarly
charge the output through the body diode of the transistor
Q2. But, as the voltage across the Q2 changes polarity, its
gate will be driven low by the Synchronous Rectifier Control
Circuit (SRC), causing Q2 to short out its body diode. The
inductor then delivers the charge to the load by discharging
into it through Q2.
Functional Description
Boost Regulator
FAN4855 is an adjustable boost regulator that combines
variable ON and minimum OFF architecture with synchro-
nous rectification. Unique control circuitry provides high-
efficiency power conversion for both light and heavy loads
by transitioning between discontinuous and continuous
conduction mode based on load conditions. There is no
oscillator; a constant-peak-current limit of 0.8A in the
inductor allows the inductor current to vary between this
peak limit and some lesser value. The switching frequency
depends upon the load, the input and output voltage ranging
up to 430kHz.
Under light load conditions, the amount of energy delivered
in this single pulse satisfies the voltage-control loop, and the
converter does not command any more energy pulses until
the output drops again below the lower-voltage threshold.
Under medium and heavy loads, a single energy pulse is not
sufficient to force the output voltage above its upper thresh-
old before the minimum off time has expired and a second
charge cycle is commanded. Since the inductor current has
not reached zero in this case, the peak current is greater than
the previous value at the end of the second cycle. The result
is a ratcheting of inductor current until either the output volt-
age is satisfied, or the converter reaches its set current limit.
The input voltage VIN comes to VIN pin and through the
external inductor to the VL pin of the device. The loop from
VOUT closes through the external resistive voltage divider to
the feedback pin VFB. The transfer ratio of this divider deter-
mines the output voltage. When VFB voltage drops below the
VREF = 1.24V the error amplifier A1 signals to regulator to
deliver charge to the output by triggering the Variable On-
Time One Shot. One Shot generates a pulse at the gate of the
Power NMOS transistor Q1. This transistor will charge the
Inductor L1 for the time interval TON resulting in a peak
current given by:
After a period of time TOFF > 1µS, determined by Minimum
Off–Time Logic and if VOUT is low (VFB < VREF), the
Variable On-Time One Shot will be turned ON again and
the process repeats.
The output capacitor of the converter filters the variable
component, limiting the output voltage ripple to a value
determined by its capacitance and its ESR.
TON × VIN
IL(PEAK) = --------------------------
L1
8
REV. 1.0.0 3/17/04
FAN4855
PRODUCT SPECIFICATION
The synchronous rectifier significantly improves efficiency
without the addition of an external component, so that
conversion efficiency can be as high as 94% over a large load
range, as shown in the Typical Operating Characteristics.
Even at light loads, the efficiency stays high because the
switching losses of the converter are minimized by reducing
the switching frequency.
The battery voltage, at which the detection circuit switches,
can be programmed with a resistive divider connected to
the LBI-pin. The resistive divider scales down the battery
voltage to a voltage level of tenths of volt, which is then
compared to the LBI threshold voltage. The LBI-pin has a
built-in hysteresis of 25 mV. The resistor values R1 and R2
can be calculated using the following equation:
VIN_MIN = 0.39 x (R1+R2)/R2
Error Detection Comparator (LBI – LBO)
An additional comparator A3 is provided to detect low VIN
or any other error conditions that is important to the user.
The non-inverting input of the comparator is internally
connected to a reference threshold voltage Vth while the
inverting input is connected to the LBI pin. The output of the
low battery comparator is a simple open-drain output
that goes active low if the battery voltage drops below the
programmed threshold voltage on LBI. The output requires a
pull-up resistor having a recommended value of 100 kΩ,
The value of R2 should be 270k or less to minimize bias
current errors. R1 is then found by rearranging the equation:
R1 = R2 x (VIN_MIN/0.39 – 1)
If the low-battery detection circuit is not used, the LBI-pin
should be connected to GND (or to VIN) and the LBO-pin
can be left unconnected or tied to GND. Do not let the
LBI-pin float.
should be connected only to VOUT
.
Component Selection
The low-battery detector circuit is typically used to supervise
the battery voltage and to generate an error flag or a RESET
command when the battery voltage drops below a user-set
threshold voltage. The function is active only when the
device is enabled. When the device is disabled, the LBO-pin
is high impedance.
Input and Output Capacitors Selection
For common general purpose applications, 47µF tantalum
capacitors are recommended. Ceramic capacitors are recom-
mended at input only; if connected at the output they cannot
improve significantly the voltage ripple. More effective in
reducing the output ripple at light load is to connect a small
capacitor of 18 to 100pF between VOUT and FB pin.
Shutdown
The device enters shutdown when VSHDN is approximately
less than 0.5VIN. During shutdown the regulator stops
switching, all internal control circuitry including the low-
battery comparator is switched off and the load is
disconnected from the input. The output voltage may drop
below the input voltage during shutdown. The typical depen-
dence shutdown voltage versus input voltage and the timing
process of the exiting shutdown are shown on the Diagrams.
For normal operation VSHDN should be driven up 0.8VIN or
Table 1. Recommended capacitors
Vendor
MuRata
AVX
Description
X5R Ceramic
TAJ,TPS series tantalum
595D series tantalum
T494 series tantalum
Sprague
Kemet
connected to the VIN
.
Inductor Selection
The inductor parameters directly influencing the device per-
formance are the saturation current and the DC resistance.
The FAN4855 operates with a typical inductance of 10µH.
The lower the resistance, the higher the efficiency. The satu-
ration current should be rated higher than 0.8A, which is the
typical threshold to switch off the N-channel power FET.
Application Information
Selecting the Output Voltage
The output voltage VOUT can be adjusted from 3V to 5V,
choosing resistors R4 and R5 of the divider in the feedback
circuit (see Test Circuit). The value of the R5 is recom-
mended to be less than 270k. R4 can be calculated using
the following equation:
Table 2. Recommended Inductors
Supplier
MuRata
Coilcraft
Coiltronics
Sumida
Manufacturer Part Number
LQ66C100M4
R4 = R5[(VOUT/VREF) – 1]
where VREF = 1.24V
DT1608C-103
UP1B100
CDR63B-100
Setting the LBI Threshold of Low-Battery
Detector Circuit
The LBO-pin goes active low when the voltage on the
LBI-pin decreases below the set threshold typical voltage of
390 mV, which is set by to the internal reference voltage.
REV. 1.0.0 3/17/04
9
PRODUCT SPECIFICATION
FAN4855
Layout and Grounding
Considerations
Application Example
The FAN4855 can be used as a constant current source to
drive white LEDs like QTLP670C-IW. As shown in the
diagram below, the current is maintained constant over a
wide range of input voltages.
Careful design of printed circuit board is recommended since
high frequency switching and high peak currents are present
in DC/DC converters applications. A general rule is to place
the converter circuitry well away from any sensitive analog
components. The printed circuit board layout should be
based on some simple rules to minimize EMI and to ensure
good regulation performances:
L = 10µH
FAN4855
D1
D2
D3
62Ω
62Ω
62Ω
1
8
2
3
4
7
6
5
1. Place the IC, inductor, input and output capacitor as
close together as possible.
+
+
+
Cout
10µF
Cin
10µF
2. Keep the output capacitor as close to the FAN4855 as
possible with very short traces to VOUT and GND pins.
Typically it should be within 0.25 inches or 6 mm.
D4
62Ω
3. Keep the traces for the power components wide,
typically > 50 mils or 1.25 mm.
20
19.8
19.6
19.4
19.2
19
18.8
18.6
18.4
18.2
18
4. Place the external networks for LBI and FB close to
FAN4855, but away from the power components as far
as possible to prevent voltage transient from coupling
into sensitive nodes.
5. On multilayer boards use component side copper for
grounding around the IC and connect back to a quiet
ground plane using vias. The ground planes act as
electromagnetic shields for some of the RF energy
radiated.
0
1
2
3
4
5
Input Voltage (V)
6. The connection of the GND pin of the IC (pin 8) to the
overall grounding system should be directly to the
bottom of the output filter capacitor. A star grounding
system radiating from where the power enters the PCB,
is a recommended practice.
10
REV. 1.0.0 3/17/04
PRODUCT SPECIFICATION
FAN4855
Mechanical Dimensions
Package:T08, 8-Pin TSSOP
0.113 - 0.123
(2.87 - 3.12)
8
0.169 - 0.177 0.246 - 0.258
(4.29 - 4.50) (6.25 - 6.55)
PIN 1 ID
1
0.026 BSC
(0.65 BSC)
0.043 MAX
(1.10 MAX)
0°-8°
0.008 - 0.012
(0.20 - 0.30)
0.020 - 0.028
(0.51 - 0.71)
0.033 - 0.037
(0.84 - 0.94)
0.004 - 0.008
(0.10 - 0.20)
0.002 - 0.006
(0.05 - 0.71)
SEATING PLANE
11
REV. 1.0.0 3/17/04
FAN4855
PRODUCT SPECIFICATION
Mechanical Dimensions
Package: 8-Pin MSOP
0.118 0.004
[3 0.1]
-A-
SYMM
L
8
5
C
0.189
[4.8]
0.118 0.004
[3 0.1]
0.193 0.004
[4.9 0.1]
-B-
0.040
[1.02]
TYP
PIN 1
IDENT
0.016
[0.41]
TYP
0.0256
TYP
[0.65]
LAND PATTERN RECOMMENDATION
1
4
TYP
(0.0256)
[0.65]
0.005
[0.13]
R
TYP
GAGE PLANE
0.030 - 0.037
[0.76 - 0.94]
0.005
[0.13]
R
TYP
(0.010)
[0.25]
_
_
C
0.002[0.05] C
0.034
[0.84]
0.021 0.005
[0.53 0.12]
0.012+0.002
[0.3 0.05]
TYP
0°-6° TYP
0.002 - 0.006
TYP
0.375
[0.953]
[0.06 - 0.15]
SEATING PLANE
0.002[0.05] M
S
E S
0.007 0.002
[0.18 0.05]
TYP
REV. 1.0.0 3/17/04
12
PRODUCT SPECIFICATION
FAN4855
Ordering Information (TA = -40°C to +85°C)
Part Number
FAN4855MTC
FAN4855MTCX
FAN4855MU
Package
Packing
Rails
8 Pin TSSOP
8 Pin TSSOP
8 Pin MSOP
8 Pin MSOP
Tape and Reel
Rails
FAN4855MUX
Tape and Reel
DISCLAIMER
FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO
ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME
ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN;
NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS.
LIFE SUPPORT POLICY
FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES
OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR
CORPORATION. As used herein:
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the body, or
(b) support or sustain life, and (c) whose failure to perform
when properly used in accordance with instructions for use
provided in the labeling, can be reasonably expected to
result in a significant injury of the user.
2. A critical component in any component of a life support
device or system whose failure to perform can be
reasonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
www.fairchildsemi.com
3/17/04 0.0m 005
Stock#DS30004855
2004 Fairchild Semiconductor Corporation
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SMBus Multi-Output Power-Supply ControllerWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
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SI9136_11
Multi-Output Power-Supply ControllerWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
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VISHAY
SI9130CG-T1-E3
Pin-Programmable Dual Controller - Portable PCsWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
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SI9130LG-T1-E3
Pin-Programmable Dual Controller - Portable PCsWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
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VISHAY
SI9130_11
Pin-Programmable Dual Controller - Portable PCsWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
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SI9137
Multi-Output, Sequence Selectable Power-Supply Controller for Mobile ApplicationsWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
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VISHAY
SI9137DB
Multi-Output, Sequence Selectable Power-Supply Controller for Mobile ApplicationsWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
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VISHAY
SI9137LG
Multi-Output, Sequence Selectable Power-Supply Controller for Mobile ApplicationsWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
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VISHAY
SI9122E
500-kHz Half-Bridge DC/DC Controller with Integrated Secondary Synchronous Rectification DriversWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
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VISHAY
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