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UTC UT2306/UT2306-3.3V/UT2306-5.0V LINEAR INTEGRATED CIRCUIT
MICROPOWER DC/DC CONVERTERS WITH LOW-BATTERY DETECTOR ACTIVE IN SHUTDOWN
DESCRIPTION
The UTC UT2306 is a micropower step-up DC/DC converter ideal for use in small, low voltage, battery-operated systems. The devices operate from a wide input supply range of 1.5V to 8V. The UTC UT2306-3.3 and UT2306-5.0 generate regulated outputs of 3.3V and 5V and the adjustable UT2306 can deliver output voltages up to 25V.Quiescent current,120 A in active mode, decreases to just 10 A in shutdown with the low-battery detector still active. Peak switch current, internally set at 1A,can be reduced by adding a single resistor from the ILIM pin to ground. The high speed operation of the UTC UT2306 allows the use of small, surface-mountable inductors and capacitors.
SOP-8
DIP-8
FEATURES
*5V at 200mA from two cells. *10 A quiescent current in shutdown. *Operates with VIN as low as1.5V *Low battery detector active in shutdown *Low switch VCESAT:370mV at 1A typical. *120 A quiescent current in active mode. *Switching frequency up to 300kHz *Programmable peak current with one resistor. .
*Pb-free plating product number: UT2306L/UT2306L-3.3V/UT2306L-5.0V
APPLICATIONS
*2-,3-,or 4-cell to 5V or 3.3V step-up *Portable instruments *Bar code scanners *Palmtop computers *Diagnostic medical instrumentation. *Personal data communicators/computers.
PIN CONFIGURATION
LBI LBO VIN SW
1 2 3 4
8 7 6 5
FB(SENSE)* SHDN ILI M GND
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UTC UT2306/UT2306-3.3V/UT2306-5.0V LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATINGS
PARAMETER
Input Voltage SW Voltage FB Voltage(UT2306) ILIM Voltage(UT2306-3.3/UT2306-5.0) SHDN Voltage LBI Voltage LBO Voltage Maximum Power Dissipation Junction Temperature Operating Temperature Range Storage Temperature Range Lead Temperature (soldering,10sec)
SYMBOL
VIN
RATING
8 -0.4 ~ +25 VIN+0.3 5 6 VIN 8 500 125 0 ~ 70 -65 ~ +150 300
UNIT
V V V V V V V mW
PD Tj Topr Tstg
C C C C
ELECTRICAL CHARACTERISTICS (VIN=2V,VSHDN=2V Unless otherwise noted.)
PARAMETER
Minimum Operating Voltage Operating Voltage Range Quiescent Current Quiescent Current In Shutdown Comparator Trip Point FB Pin Bias Current Sense Pin Leakage in Shutdown Line Regulation LBI Input Threshold LBI Bias Current LBI Input Hysteresis LBO Output Voltage Low LBO Output Leakage Current SHDN Input Voltage High SHDN Input Voltage Low SHDN Pin Bias Current Switching Off Time Switch On Time Maximum Duty Cycle Peak Switch Current Switch Saturation Voltage Switch Leakage * * * * * VSHDN=2V,Not switching VSHDN=0V,VIN=2V VSHDN=0V,VIN=5V 1.22 VSHDN=0V,Fixed Output Versions 1.8VVIN8V Falling Edge 1.10 120 7 27 1.24 10 0.002 0.04 1.17 6 35 ISINK=500A LBI=1.5V,LBO=5V 1.4 0.4 V SHDN=5V V SHDN=0V Current Limit Not Asserted Current Limit Not Asserted ILIM Pin Open,VIN=5V 20K from ILIM to GND Isw=1A * Isw=700mA Switch off, Vsw=5V -5 1 4 76 0.8 5 -2 1.5 6 80 1 500 0.37 0.26 0.01 0.35 7 2 8 88 1.2 8 0.2 0.01
TEST CONDITIONS
MIN
TYP
1.5
MAX
1.65 8 200 15 50 1.26 25 1 0.15 1.25 20 65 0.4 0.1
UNIT
V V A A A V nA A %/V V nA mV V A V V A A s s % A mA V V A
* *
* * * * * * * * * * * * * *
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UTC UT2306/UT2306-3.3V/UT2306-5.0V LINEAR INTEGRATED CIRCUIT
The * denotes specifications which apply over the 0C to 70C operating temperature range.
PIN FUNCTIONS
PIN No. 1 2 3 4 5 6 7 SYMBOL
LBI LBO VIN SW GND ILIM
DESCRIPTION
Low Battery Detector Input. When voltage on this pin is less than 1.17V,detector output is low Low Battery Detector Output. Open collector can sink up to 500A.Low battery detector remains active when device is shut down. Input Supply. Must be bypassed close (<0.2") to the pin. See required layout in the Typical Applications Collector of Power NPN. Keep copper traces on this pin short and direct to minimize RFI Device Ground. Must be low impedance; solder directly to ground plane Current Limit Set Pin. Float for 1A peak switch current; a resistor to ground will lower peak current
SHDN
Shutdown Input. When low, switching regulator is turned off. The low-battery detector remains active. The SHDN input should not be left floating. If SHDN is not used, tie the pin to VIN
On the UT2306 (adjustable) this pin goes to the comparator input. On the fixed-output versions, the pin connects to the resistor divider which sets output voltage. The divider is disconnected from the pin during shutdown.
8
FB/SENSE
TYPICAL APPLICATION
2-Cell to 5V Step-Up Converter with Low-Battery Detect
22 H D1 1N5817
90 80
EFFICIENCY (%)
Efficiency
499K 1 + 2 CELLS 100 F
3 VIN LBI
4 SW 8 SENSE 100K +
5V 200mA 100 F LBO LOW WHEN VBAT 2.2V
70
604K UT2306-5.0 6 NC I LIM IBO 2 SHDN 7 SHUTDOWN GND 5
60 50 40 0.01
V IN =3.3V V IN =2.5V V IN =1.8V
1 10 100 500 LOAD CURRENT(mA)
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UTC UT2306/UT2306-3.3V/UT2306-5.0V LINEAR INTEGRATED CIRCUIT
TYPICAL PERFORMANCE CHARACTERISTICS
Switch Saturation Voltage 500 Ta =25 Saturation Voltage (mV) 1.2 400 1.1 300 Peak Current (A) 1.0 0.9 0.8 0.7 0.6 -50 1.3 Peak Switch Current Limit
200
100 0 0 0.2 0.4 0.6 0.8 1.0 1.2 Switch Current (A) O n-and O ff-times 8 7 6 5 4 3 2 1 0 -50 -25 0 25 50 ) 75 100 O ff-T ime Feedback Voltage (V) Maximum O n-Time
-25
0
25
50 )
75
100
Temperature(
Feedback Voltage 1.250 1.245 1.240 1.235 1.230 1.225 1.220 1.215 1.210 1.205 1.200 -50 -25 0 25 50 ) 75 100
T ime (
s)
Temperature(
Temperature(
Feedback Pin Bias Current 20 18 16 14 Bias Current (nA) Supply Current s) 12 10 8 6 4 2 0 -50 -25 0 25 50 ) 75 100 200 150 250 300 Ta =25
Supply Current
VSHDN=VN NOT SW ITCHING
100
VSHDN= 0 V
50 0
0
1
2
3
4
5
6
7
8
Temperature(
Input Voltage (V)
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UTC UT2306/UT2306-3.3V/UT2306-5.0V LINEAR INTEGRATED CIRCUIT
Load Transient Response
OUT V 100mV / DIV AC COUPLED O UT V 100mV/DIV AC COUPLED
Burst Mode Operation
Vs w 5V/DIV IL 500mA/DIV 100 s / DIV 20 VIN=2.5V VOUT=5V ILOAD=185mA L=22 H s/DIV
ILOAD 200mA 0
BLOCK DIAGRAMS
VIN
+
C1
L1 D1
+
VOUT C2
2
LBO 1.5V UNDERVOLTA GELOCKOUT
3
VIN
4
SW
1
LBI
+ 1.17V A2 A3 BIAS -1V
36mV + R2 1K OFF Q3 1K R1 7.2
R3 8 R4 FB A1 + 1.24V VREF ENABLE
TIMERS 6 s ON 1.5 s OFF DRIVER
Q2 1
Q1 200
SHUTDOWN 7 SHDN 6 ILIM 5 GND
Figure 1. UT2306 Block Diagram. Independent Low-Battery Detector A3 Remains Alive When Device Is in Shutdown
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UTC UT2306/UT2306-3.3V/UT2306-5.0V LINEAR INTEGRATED CIRCUIT
1 2 LBO 1.5V UNDERVOLTA GELOCKOUT 8 LBI 36mV + 1.17V R3
590K
3
VIN
4
SW
+ A2 A3 BIAS -1V R2 1K OFF Q3 1K ENABLE A1 TIMERS 6 s ON 1.5 s OFF DRIVER
R1 7.2
R4 + 1.24V VREF
Q2 1
Q1 200
SHUTDOWN 7
R4=355K (UT2306-3.3V) R4=195K (UT2306-5.0V)
SHDN
6
ILIM
5
GND
Figure 2. UT2306-3.3/UT2306-5.0 Block Diagram
OPERATION
The UT2306 operation can best be understood by examining the block diagram in Figure 1.Comparator A1monitors the output voltage via resistor divider string R3/R4 at the FB pin. When VFB is higher than the 1.24V reference,A2 and the timers are turned off. Only the reference, A1 and A3 consume current, typically 120A.As VFB drops below 1.24V plus A1's hysteresis (about 6mV),A1 enables the rest of the circuit. Power switch Q1 is then cycled on for 6s, or until current comparator A2 turns off the ON timer, Whichever comes first. Off-time is fixed at approximately 1.5s. Q1's switching cause current to alternately build up in inductor L1 and discharge into output capacitor C2 via D1, increasing the output voltage .As VFB increases enough to overcome C1's hysteresis, switching action ceases. C2 is left to supply current to the load until VOUT decreases enough to force A1's output high, and the entire cycle repeats. If switch current reaches 1A,causing A2 to trip, switch ON time is reduced. This allows continuous mode operation during bursts.A2 monitors the voltage across 7.2 resistor R1,which is directly related to the switch current.Q2's collector current is set by the emitter-area ratio to 0.5% of Q1's collector current. R1's voltage drop exceeds 36mV,corresponding to 1A switch current,A2's output goes high ,truncating the ON time part of the switch cycle. The 1A peak current can be reduced by tying a resistor between the ILIM pin and ground, causing a voltage drop to appear across R2.The drop offsets some of the 36mV reference voltage, lowering peak current. A 22K resistor limits current to approximately 550mA.A capacitor connected between ILIM and ground provides soft start. Shutdown is accomplished by grounding the SHDN pin. The low-battery detector A3 has its own 1.17V reference and is always on. The open collector output device can sink up to 500A.Approximately 35mV of hysteresis is built into A3 to reduce "buzzing" as the battery voltage reaches the trip level.
INDUCTOR SELECTION
Inductors used with the UT2306 must be capable of handling the worst-case peak switch current of 1.2A without saturating. Open flux rod or drum core units may be biased into saturation by 20% with only a small reduction in efficiency. For the majority of 2-cell or 3-cell input UT2306 applications, a 22H or 20H inductor such as the Sumida CD54-220 (drum) or Coiltronics CTX20-1 (toroid) will suffice. If switch current is reduced using the ILIM pin, smaller inductors such as the Sumida CD43 series or Coilcraft DO1608 series can be used. Minimizing
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UTC UT2306/UT2306-3.3V/UT2306-5.0V LINEAR INTEGRATED CIRCUIT
DCR is important for best efficiency. Ideally, the inductor DCR should be less than 0.05W, although the physical size of such an inductor makes its use prohibitive in many space conscious applications. If EMI is a concern, such as when sensitive analog circuitry is present, a toroidal inductor such as the Coiltronics CTX20-1 is suggested. A special case exists where the VOUT/VIN differential is high, such as a 2V to 12V boost converter. If the required duty cycle for continuous mode operation is higher than the UT2306 can provide, the converter must be designed for discontinuous operation. This means that the inductor current decreases to zero during the switch OFF time. For a simple step-up (boost) converter, duty cycle can be calculated by the following formula: DC = 1 - [(VIN - VSAT)/(VOUT + VD)] where, VIN = Minimum input voltage VSAT = Switch saturation voltage (0.3V) VOUT = Output voltage VD = Diode forward voltage (0.4V) If the calculated duty cycle exceeds the minimum UT2306 duty cycle of 76%, the converter should be designed for discontinuous mode operation. The inductance must be low enough so that current in the inductor reaches the peak current in a single cycle. Inductor value can be calculated by: L = (VIN - VSAT)(tON/1A) where, tON = Minimum on-time of UT2306 (4s) One advantage of discontinuous mode operation is that inductor values are usually quite low so very small units can be used. Ripple current is higher than with continuous mode designs and efficiency will be somewhat less.
Capacitor Selection
Low ESR (Equivalent Series Resistance) capacitors should be used at the output of the UT2306 to minimize output ripple voltage. High quality input bypassing is also required. For surface mount applications AVX TPS series tantalum capacitors are recommended. These have been specifically designed for switch mode power supplies and have low ESR along with high surge current ratings. A 100F, 10V AVX TPS surface mount capacitor typically limits output ripple voltage to 70mV when stepping up from 2V to 5V at a 200mA load. For through hole applications Sanyo OS-CON capacitors offer extremely low ESR in a small package size. Again, if peak switch current is reduced using the ILIM pin, capacitor requirements can be eased and smaller, higher ESR units can be used.
Diode Selection
Best performance is obtained with a Schottky rectifier such as the 1N5818. Motorola makes the MBRS130L Schottky which is slightly better than the 1N5818 and comes in a surface mount package. For lower switch currents, the MBR0530 is recommended. It comes in a very small SOD-123 package. Multiple 1N4148s in parallel can be used in a pinch, although efficiency will suffer. ILIM Function The UT2306's current limit (ILIM) pin can be used for soft start. Upon start-up, the UT2306 will draw maximum current (about 1A) from the supply to charge the output capacitor. Figure 3 shows VOUT and VIN waveforms as the device is turned on. The high current flow can create IR drops along supply and ground lines or cause the input supply to drop out momentarily. By adding R1 and C1 as shown in Figure 4, the switch current is initially limited to well under 1A as detailed in Figure 5. Current flowing into C1 from R1 and the ILIM pin will eventually charge C1 and R1 effectively takes C1 out of the circuit. R1 also provides a discharge path for C1 when SHUTDOWN is brought low for turn-off.
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UTC UT2306/UT2306-3.3V/UT2306-5.0V LINEAR INTEGRATED CIRCUIT
VOUT 2V/DIV I IN 500mA/DIV V SHDN 10V/DIV 1ms/DIV Figure 3. Start-Up Response.Input Current Rises Quickly to 1A. VOUT Reaches 5V in Approximately 1ms.Output Drives 20mA Load
MBRS130L
22
H*
+ 2 CELLS
100
F
V IN LBI
SW SENSE
5V 200mA
UT2306-5.0 IBO GND SHDN I LIM + R1 1M C1 1 F SHUTDOWN +
100
F
*SUMIDA CD54-220 Figure4.2-Cell to 5V/200mA Boost Converter Takes Four External Parts.Components with Dashed Lines Are for Soft Start(Optional)
If the full power capability of the UT2306 is not required,peak switch current can be limited by connecting a resistor RLIM from the ILIM pin to ground. With RLIM = 22k, peak switch current is reduced to approximately 500mA. Smaller power components can then be used. The graph in Figure 6 shows switch current vs RLIM resistor value.
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UTC UT2306/UT2306-3.3V/UT2306-5.0V LINEAR INTEGRATED CIRCUIT
VOUT 2V/DIV IIN 500mA/DIV VSHDN 10V/DIV 1ms/DIV
1304 F05
Figure 5. Start-Up Response with 1 F/1M Components in Figure 2 Added. Input Current Is More Controlled. VOUT Reaches 5V in6ms.Output Drives 20mA Load.
1000 PEAK CURRENT(mA)(%) 900 800 700 600 500 400 10
100 RLIM(k
1000
Figure 6.Peak Switch Current vs RLIM Value
LAYOUT/INPUT BYPASSING The UT2306 high speed switching mandates careful attention to PC board layout. Suggested component place-ment is shown in Figure 7.The input supply must have low impedance at AC and the input capacitor should be placed as indicated in the figure. The value of this capacitor depends on how close the input supply is to the IC. In situations where the input supply is more than a few inches away from the IC, a 47F to 100F solid tantalum bypass capacitor is required. If the input supply is close to the IC, a 1F ceramic capacitor can be used instead. The UT2306 switches current in 1A pulses, so a low impedance supply must be available. If the power source (for example, a 2AA cell battery) is within 1 or 2 inches of the IC, the battery itself provides bulk capacitance and the 1F ceramic capacitor acts to smooth voltage spikes at switch turn-on and turn -off. If the power source is far away from the IC, inductance in the power source leads results in high impedance at high frequency. A local high capacitance bypass is then required to restore low impedance at the IC.
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SHUTDOWN
1 2 VIN 3 4 VOUT + + COUT UT2306
8 7 6 5 CIN
GND (BATTERY AND LOAD RETURN) Figure 7. Suggested Layout for Best Performance.Input Capacitor Placement as Shown Is Highly Recommended.Switch Trace (pin 4) Copper Area Is Minimized
Low-Battery Detector
The UT2306 contains an independent low-battery detector that remains active when the device is shut down. This detector, actually a hysteretic comparator, has an open collector output that can sink up to 500A.The comparator also operates below the switcher's undervoltage lockout threshold, operating until VIN reaches approximately 1.4V.Figure 8 illustrates the input /output characteristic of the detector. Hysteresis is clearly evident in the figure.
VLBO 2V/DIV
VLBI 200mV/DIV Figure 8. Low-Battery Detector Transfer Function. Pull-Up R=22K,VIN=2V,Sweep Frequency=10Hz
Battery Life How may hours does it work? This is the bottom line question that must be asked of any efficiency study. AA alkaline cells are not perfect power sources. For efficient power transfer, energy must be taken from AA cells at a rate that does not induce excessive loss. AA cells internal impedance, about 0.2 fresh and 0.5 end-of-life, results in significant efficiency loss at high discharge rates. Figure 10 illustrates battery life vs load current of Figure 9's UT2306, 2-cell to 5V DC/DC converter. Note the accelerated decrease in hours at higher power levels. Figure 11 plots total watt hours vs load current. Watt hours are determined by the following formula: WH = ILOAD(5V)(H)
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UTC UT2306/UT2306-3.3V/UT2306-5.0V LINEAR INTEGRATED CIRCUIT
L1 22 H D1
VIN B1 2 CELLS SHDN
SW SENSE
UT2306-5.0 LBI + C1 100 ILIM F IBO GND +
VOUT 5V 200mA
C2 100
F
Figure9.2-cell to 5V Converter Used in Battery Life Study
1000
100
HOURS(H)
10
10 100 200 LOAD CURRENT(mA) Figure 10. Battery Life vs Current.Dots Specify Actual Measurements
1 1
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UTC UT2306/UT2306-3.3V/UT2306-5.0V LINEAR INTEGRATED CIRCUIT
6 5
WATT HOURS(WH)
4 3 2 1 0 1 10 100 LOAD CURRENT(mA) 200
Figure 11. Output Wall Hours vs Load Current. Note Rapid Fall-Off at Higher Discharge Rates
Figure 11's graph varies significantly from electrical efficiency plot pictured on the first page of this data sheet. Why? As more current is drawn from the battery, voltage drop across the cells' internal impedance increases. This causes internal power loss (heating), reducing cell terminal voltage. Since the regulator input acts as a negative resistance, more current is drawn from the battery as the terminal voltage decreases. This positive feedback action compounds the problem. Figure 12 shows overall energy conversion efficiency, assuming availability of 6.5WH of battery energy. This efficiency approximates the electrical efficiency at load current levels from 1mA to 10mA, but drops severely at load currents above 10mA (load power above 50mW). The moral of the story is this: if your system needs 5V at more than 40mA to 50mA, consider using a NiCd battery (1/10 the internal impedance) instead of a AA cell alkaline battery.
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UTC UT2306/UT2306-3.3V/UT2306-5.0V LINEAR INTEGRATED CIRCUIT
ELECTROCHEMICAL EFFICIENCY(%)
100 90 80 70 60 50 40 30 20 10 0 1 10 LOAD CURRENT(mA) 100 200
Figure 12. Overall System Efficiency Including Battery Efficiency vs Load Current.Internal lmpedance of Alkaline AA Cells Accounts for Rapid Drop in Efficiency at Higher Load Current
TYPICAL CHARACTERISTICS
Super Burst Efficiency
Super Burst Low
IQ10 A 200K 47K 2 CELLS + 100 F
IQ
DC/DC Converter
MBR0530
90 80
Efficiency (%)
33 H 0.0 F 1 SW LBI LIM I GND 22K 5V 100mA +
VIN=3V
2N3906
70
V IN LBO FB SHDN 47K
VIN=2V
UT2306
3.83M 1% 1.21M
60 50 40 0.01
220 F
0.1
1.0
10
100
Load Current (m)
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UTC UT2306/UT2306-3.3V/UT2306-5.0V LINEAR INTEGRATED CIRCUIT
2-Cell to 3.3V Boost Converter
L1 22 H MBRS130L
90 80
Efficiency (%)
2-Cell to 3.3V ConverterEfficiency
+ C1 10 2 CELLS
70 60 50 40 30 0.1 1 VIN=3.3V VIN=2.5V VIN=1.8V 10 100 Load Current (mA) 1000
F
V IN
SW SENSE UT2306-3.3 GND +
3.3V 300mA C2 100 F 10V
SHDN ILIM SHUTDOWN NC
3.3V SEPIC Efficiency(Step-Up/Step-Down Converter)
L1A VIN 4 VIN SW 3 2 + C2 47 F 16V 1 L1B * MBRS130L C1 1F
3.3V SEPIC Efficiency 80 75
Efficiency (%)
2.5V TO 8V
70 65 60 55 50 1 VIN=4.5V VIN=3.5V VIN=2.5V 10 100 Load Current (mA) 500
UT2306-3.3 SHUTDOWN SHDN SENSE I LIM N C GND
3.3V 300mA + C3 100 F 10V
5V SPEC (Step-Up/Step-Down Converter)
L1A VIN 3V TO 8V + 2 1 4 47 F 16V 3 5V 200mA + 100 F 10V L1B MBRS130L
C1
1
F
80 75
Efficiency (%)
5V SEPIC Efficiency
V IN
SW
70 65 VIN=6V 60 55 50 1 VIN=5V VIN=4V VIN=3V
UT2306-5.0 SHUTDOWN SHDN I LIM NC SENSE GND
10 100 Load Current (mA)
500
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UTC UT2306/UT2306-3.3V/UT2306-5.0V LINEAR INTEGRATED CIRCUIT
5V to 12V DC/DC Converter
L1 22 5V D1 MBRS130L
5V to 12V Converter Efficiency 90
85
VIN 47 F SW UT2306 SHDN FB GND 1.07M 1% +
SHUTDONW
12V 200mA 47 F 16V
Efficiency (%)
+
80 75
124K 1%
70 65 1
10 100 Load Current(mA)
300
Single Li-lon Cell to 5V Converter with Load Disconnect at Vin 2.7V
22 562k 1% H
MBRS130L
5V +
+ 100
F
220k VIN ILIM SW SENSE Vout VIN1 VINS SHDN GND IBO EN Vout VIN2 VIN3 GND NC NC
1
F
SINGLE LI-ION CELL 432k 1%
NC
LBI UT2306-5.0
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UTC UT2306/UT2306-3.3V/UT2306-5.0V LINEAR INTEGRATED CIRCUIT
Negative LCD Bias Generator
L1* 10 MBR0530 1.69M 1% 1M 1% 110K 1% MBR0530 1000 pF MBR0530 +
1F CERAMIC -VOUT -14V TO -22V 1mA TO 10mA
VIN + 2 CELLS 47 F ILIM 22K UT2306
SW FB 90.9K 1% + 3.3 F
GND
10 F 35V EFFICIENCY =70% TO 75% AT ILOAD 2mA
VOLTAGE ADJUST 1kHz PWM INPUT 0V TO 5V
Electroluminescent Panel Driver with 200Hz Oscillator
VIN 2V TO 7V 47 + F 3 1 1:12 4 MUR160 600V 1F 200V
6 MBR0530 SW FB 51K
H HIG ERI ANG TAGE D VOL
10M (3.3M*3) FMMT458 22K 22K 22K 50K INTENSITY ADJUST 1/2 BAW56
EL PANEL CPANEL 20nF
5V=OPERATE 0V=SHUTDOWN 22K 2N3906 75K 3.3K +
VIN 22K 1nF LBI ILIM 0.01 200Hz F NC SHDN
LBO UT2306
GND
1/2 BAW56
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UTC UT2306/UT2306-3.3V/UT2306-5.0V LINEAR INTEGRATED CIRCUIT
2-to 4-Cell to 1kV Step-Up Converter
0.01 F T1 + 47 F 3 1 VIN 4 6
MBR0530
0.01 F
0.01 F
0.01 F
0.01 F
VIN 2V TO 6V
0.01 F
0.01 F
0.01 F
0.01 F
LTAGE IGH VO GERI H DAN
0.1 F
SW FB
UT2306 SHUTDOWN SHDN ILIM GND NC
R2 620K
R1 500M
VOUT 1kV 250 A R1 ) R2
VOUT =1.24V(1+
2- TO 4- Cell to 5V Converter with Output Disconnect
2K
L1 22 H MBRS130L
VIN
2V TO 6V
ZTX788B
VIN
+ 47 F
SW SENSE
UT2306-5.0 SHDN ILIM GND + 22 F +
5V 100mA
220
F
SHUTDOWN
NC
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UTC UT2306/UT2306-3.3V/UT2306-5.0V LINEAR INTEGRATED CIRCUIT
2- Cell to 5V Converter with Auxiliary 10V Output
MBR0530 10V 1F CERAMIC + 10 F 20mA
L1 22 H
MBR0530
MBRS130L
2CELLS
+
100 F
V IN
SW SENSE
5V 150mA
UT2306-5.0 SHDN ILIM SHUTDOWN NC GND +
10
F
2- Cell to 5V Converter with Auxiliary -5V Output
L1 22 H MBRS130L
2 CELLS
+
VIN 100 F SHDN ILIM SHUTDOWN NC
SW SENSE
5V 1F CERAMIC MBR0530 150mA -5V 20mA + MBR0530 10 F
UC2603-5.0
GND
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QW-R103-029,A
UTC UT2306/UT2306-3.3V/UT2306-5.0V LINEAR INTEGRATED CIRCUIT
UTC assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all UTC products described or contained herein. UTC products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice.
UTC
UNISONIC TECHNOLOGIES CO., LTD.
19
QW-R103-029,A

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Price & Availability of UT2306-50V

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