LTM®8023 complete DC/DC step-down power supply. Included package switc

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LTM®8023 complete DC/DC step-down power supply. Included package switc

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LTM8023 DC/DC µModule FEATURES
LTM®8023 complete DC/DC step-down power supply. Included package switching controller, power switches, inductor, support components. Operating over input voltage range 3.6V 36V, LTM8023 supports output voltage range 0.8V 10V, switching frequency range 200kHz 2.4MHz, each single resistor. Only bulk input output filter capacitors needed finish design. profile package (2.82mm) enables utilization unused space bottom boards high density point load regulation. LTM8023 packaged thermally enhanced, compact (11.25mm 9mm) profile (2.82mm) over-molded Land Grid Array (LGA) package suitable automated assembly standard surface mount equipment. LTM8023 Pb-free RoHS compliant.
Lare registered trademarks Linear Technology Corporation. other trademarks property their respective owners.
Complete Step-Down Switch Mode Power Supply Wide Input Voltage Range: 3.6V Output Current 0.8V Output Voltage Selectable Switching Frequency: 200kHz 2.4MHz Current Mode Control Pb-Free (e4) RoHS Compliant Package with Gold Finish Programmable Soft-Start Tiny, Profile (11.25mm 2.82mm) Surface Mount Package
APPLICATIONS
Automotive Battery Regulation Power Portable Products Distributed Supply Regulation Industrial Supplies Wall Transformer Regulation
TYPICAL APPLICATION
5.5VIN 36VIN, 3.3V/2A DC/DC Module Converter
5.5V 2.2F RUN/SS VOUT BIAS EFFICIENCY LTM8023 PGOOD SELECTABLE OPERATING FREQUENCY 49.9k SYNC
8023 TA01
Efficiency Power Loss
VOUT 3.3V VOUT 3.3V LOAD CURRENT
8023 TA01b
POWER LOSS (mW)
154k
0.01
8023f
LTM8023 ABSOLUTE MAXIMUM RATINGS
(Note
CONFIGURATION
VIEW BANK BANK BANK
VIN, RUN/SS Voltage .40V ADJ, SHARE Voltage VOUT, .10V PGOOD, SYNC .30V BIAS .16V BIAS .56V Maximum Junction Temperature (Note 125°C Solder Temperature. 240°C
Package 50-Lead (11.25mm 2.82mm) TJMAX 125°C, 24°C/W DERIVED FROM 6.6cm WITH LAYERS WEIGHT 0.93g (SEE TABLE ASSIGNMENT)
ORDER INFORMATION
LEAD FREE FINISH LTM8023EV#PBF PART MARKING LTM8023V PACKAGE DESCRIPTION 50-Lead (11.25mm 2.82mm) JUNCTION TEMPERATURE RANGE -40°C 125°C Consult Marketing parts specified with wider operating temperature ranges. more information lead free part marking, http://www.linear.com/leadfree/ This product only offered trays. more information
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LTM8023 ELECTRICAL CHARACTERISTICS
SYMBOL VOUT RADJ(MIN) IOUT IQVIN PARAMETER Input Voltage Output Voltage Minimum Allowable RADJ Continuous Output Current Quiescent Current COUT VRUN/SS 0.2V, 174k VBIAS Switching, 174k VBIAS Switching, 174k VRUN/SS 0.2V, 174k VBIAS Switching, 174k VBIAS Switching, 174k IOUT VOUT =3.3V, COUT 24V, IOUT VOUT 3.3V, COUT 24V, IOUT VOUT 3.3V, COUT 113k, COUT 36V, VOUT COUT
denotes specifications which apply over full operating temperature range, otherwise specifications 25°C. 10V, VRUN/SS 10V, VBIAS 60.4k, COUT 4.7F unless otherwise specified.
CONDITIONS
42.2
UNITS
IOUT 43.2k RADJ COUT (Note
0.03
IQBIAS
BIAS Quiescent Current
VOUT/VOUT VOUT/VOUT ISC(OUT) VADJ VBIAS(MIN) IADJ IRUN/SS VIH(RUN/SS) VIL(RUN/SS) VPG(TH) IPGO IPGSINK VSYNCIL VSYNCIH ISYNCBIAS
Line Regulation Load Regulation Switching Frequency Output Short Circuit Current Voltage Minimum BIAS Voltage Proper Operation Current RUN/SS Current RUN/SS Input High Voltage RUN/SS Input Voltage Threshold Leakage Sink Current SYNC Input Threshold SYNC Input High Threshold SYNC Bias Current
VOUT(AC_RMS) Output Ripple (RMS)
COUT VRUN/SS 2.5V COUT COUT VOUT Rising 0.4V fSYNC 550kHz, COUT fSYNC 550kHz, COUT VSYNC
Note Stresses beyond those listed under Absolute Maximum Ratings cause permanent damage device. Exposure Absolute Maximum Rating condition extended periods affect device reliability lifetime.
Note LTM8023E guaranteed meet performance specifications from 85°C. Specifications over -40°C 85°C operating temperature range assured design, characterization correlation with statistical process controls. Note COUT composed 4.7F ceramic capacitor parallel with electrolytic.
8023f
LTM8023 TYPICAL PERFORMANCE CHARACTERISTICS
Efficiency (8VOUT)
VOUT EFFICIENCY EFFICIENCY 0.01 12VIN 24VIN 36VIN OUTPUT CURRENT
8023
25°C unless otherwise noted
Efficiency (5VOUT)
VOUT 0.01 12VIN 24VIN 36VIN OUTPUT CURRENT
8023
Efficiency (3.3VOUT)
VOUT 3.3V EFFICIENCY 0.01 5VIN 12VIN 24VIN 36VIN OUTPUT CURRENT
8023
Minimum Required Input Voltage Output Voltage
INPUT VOLTAGE OUTPUT VOLTAGE
8023
36VIN Start-Up Waveforms (5VOUT)
36VIN Start-Up Waveforms (3.3VOUT)
IOUT VOUT 2V/DIV 0.2A/DIV OPERATING FREQUENCY RECOMMENDED TABLE RUN/SS 5V/DIV 50s/DIV IOUT VBIAS
8023
VOUT 2V/DIV 0.2A/DIV RUN/SS 5V/DIV 50s/DIV IOUT VBIAS
8023
Input Current Output Current
1600 VOUT 1400 INPUT CURRENT (mA) INPUT CURRENT (mA) 1200 1000 1000 1500 OUTPUT CURRENT (mA) 12VIN 24VIN 36VIN 2000
8023
Input Current Output Current
1200 VOUT 1000 INPUT CURRENT (mA) 1000 1500 OUTPUT CURRENT (mA) 2000
8023
Input Current Output Current
2000 1800 1600 1400 1200 1000 1000 1500 OUTPUT CURRENT (mA) 2000
8023
VOUT 3.3V
12VIN 24VIN 36VIN
5VIN 12VIN 24VIN 36VIN
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LTM8023 TYPICAL PERFORMANCE CHARACTERISTICS
Output Short-Circuit Current Input Voltage
3200 3000 OUTPUT CURRENT (mA) 2800 BIAS CURRENT (mA) 2600 2400 2200 2000 1800 1600 INPUT VOLTAGE
8023
25°C unless otherwise noted Maximum Load Current Input Voltage (8VOUT)
2500
BIAS Current Load Current
1000 1500 LOAD CURRENT (mA) 2000
8023
2000 LOAD CURRENT (mA)
3.3VOUT 5VOUT 8VOUT
1500
1000
INPUT VOLTAGE
25°C 40°C 85°C
8023
Load Current Input Voltage (5VOUT)
2500 2500
Load Current Input Voltage (3.3VOUT)
2000 LOAD CURRENT (mA) LOAD CURRENT (mA) 25°C 40°C 85°C INPUT VOLTAGE
8023
2000
1500
1500
1000
1000
INPUT VOLTAGE
25°C 40°C 85°C
8023
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LTM8023 FUNCTIONS
(Bank supplies current LTM8023's internal regulator internal power switch. This must locally bypassed with external, capacitor least 2.2F. VOUT (Bank Power Output Pins. Apply output filter capacitor output load between these pins pins. (Pin F5): current voltage source BIAS. many designs, BIAS simply connected VOUT. VAUX internally connected VOUT placed adjacent BIAS ease printed circuit board routing. Although this internally connected VOUT, connect this load. this tied BIAS, leave floating. BIAS (Pin G5): BIAS connects internal power bus. Connect power source greater than 2.8V. output greater than 2.8V, connect this there. output voltage less, connect this voltage source between 2.8V 16V. Also, make sure that BIAS less than 56V. RUN/SS (Pin H5): RUN/SS ground shut down LTM8023. 2.5V more normal operation. shutdown feature used, this pin. RUN/SS also provides soft-start function; Applications Information section. (Bank these pins local ground plane below LTM8023 circuit components. Return feedback divider (RADJ) this net. (Pin G7): used program switching frequency LTM8023 connecting resistor from this ground. Applications Information section data sheet includes table determine resistance value based desired switching frequency. Minimize capacitance this pin. SHARE (Pin F7): this SHARE another LTM8023 when paralleling outputs. Otherwise, connect. SYNC (Pin G6): This external clock synchronization input. Ground this ripple Burst Mode operation output loads. stable voltage source greater than 0.7V disable Burst Mode operation. leave this floating. clock source synchronization. Clock edges should have rise fall times faster than synchronizing section Applications Information. PGOOD (Pin H6): PGOOD open collector output internal comparator. remains until within final regulation voltage. output valid when above 3.6V RUN/SS high. this function used, leave this floating. (Pin H7): LTM8023 regulates 0.79V. Connect adjust resistor from this ground. value RADJ given equation RADJ 394.21/(VOUT 0.79), where RADJ
8023f
LTM8023 BLOCK DIAGRAM
0.1F 4.7H 4.7pF VOUT
499k
BIAS
SHARE CURRENT MODE CONTROLLER PGOOD
RUN/SS
SYNC
8023
8023f
LTM8023 OPERATION
LTM8023 stand-alone non-isolated step down switching DC/DC power supply. deliver output current with only bulk external input output capacitors. This module provides precisely regulated output voltage programmable external resistor from 0.8VDC 10VDC. input voltage range 3.6V 36V. Given that LTM8023 step down converter, make sure that input voltage high enough support desired output voltage load current. simplified block diagram given above. LTM8023 contains current mode controller, power switching element, power inductor, power Schottky diode modest amount input output capacitance. LTM8023 fixed frequency regulator. switching frequency simply connecting appropriate resistor value from GND. internal regulator provides power control circuitry. bias regulator normally draws power from pin, BIAS connected external voltage higher than 2.8V, bias power will drawn from external source (typically regulated output voltage). This improves efficiency. RUN/SS used place LTM8023 shutdown, disconnecting output reducing input current less than further optimize efficiency, LTM8023 automatically switches Burst Mode operation light load situations. Between bursts, circuitry associated with controlling output switch shut down reducing input supply current typical application. oscillator reduces LTM8023's operating frequency when voltage low. This frequency foldback helps control output current during startup overload. LTM8023 contains power good comparator which trips when regulated value. output open-collector transistor that when output regulation, allowing external resistor pull high. Power good valid when LTM8023 enabled above 3.6V.
APPLICATIONS INFORMATION
most applications, design process straight forward, summarized follows: Look Table find that desired input range output voltage. Apply recommended CIN, COUT, RADJ values. Connect BIAS indicated. While these component combinations have been tested proper operation, incumbent upon user verify proper operation over intended system's line, load environmental conditions. Capacitor Selection Considerations COUT capacitor values Table minimum recommended values associated operating conditions. Applying capacitor values below those indicated Table recommended, result undesirable operation. Using larger values generally acceptable, yield improved dynamic response, necessary. Again, incumbent upon user verify proper operation over intended system's line, load environmental conditions. Ceramic capacitors small, robust have very ESR. However, ceramic capacitors suitable. types stable over temperature applied voltage give dependable service. Other types, including have very large temperature voltage coefficients capacitance. application circuit they have only small fraction their nominal capacitance resulting much higher output voltage ripple than expected. Ceramic capacitors also piezoelectric. Burst Mode operation, LTM8023's switching frequency depends load current, excite ceramic capacitor
8023f
LTM8023 APPLICATIONS INFORMATION
Table Recommended Compoment Values Configuration 25°C, IOUT
3.6V 3.6V 3.6V 3.6V 3.6V 3.6V 3.6V 4.1V 5.5V 7.5V 3.6V 3.6V 3.6V 3.6V 3.6V 3.6V 3.6V 3.6V 5.5V 7.5V 14.5V 4.75V VOUT 0.82V 1.00V 1.20V 1.50V 1.80V 2.00V 2.20V 2.50V 3.30V 5.00V 0.82V 1.00V 1.20V 1.50V 1.80V 2.00V 2.20V 2.50V 3.30V 5.00V 0.82V 1.00V 1.20V 1.50V 1.80V 2.00V 2.20V 2.50V 3.30V 5.00V 8.00V 0.82V 1.00V 1.20V 1.50V 1.80V 2.00V 2.20V 2.50V 3.30V 5.00V 8.00V 10.00V -3.30V -5.00V -8.00V 4.7F 2.2F 2.2F 2.2F 2.2F 2.2F 4.7F 2.2F 2.2F 2.2F 2.2F 2.2F 2.2F 2.2F 2.2F 2.2F 2.2F 2.2F 2.2F 2.2F 2.2F 2.2F 2.2F 2.2F 2.2F 2.2F 2.2F 2.2F 2.2F 2.2F 2.2F 2.2F 2.2F 2.2F COUT 200F 1206 147F 1206 100F 1206 100F 1206 100F 1206 1206 1206 1206 1206 4.7F 0805 200F 1206 147F 1206 100F 1206 100F 1206 100F 1206 1206 1206 1206 1206 4.7F 0805 200F 1206 147F 1206 100F 1206 100F 1206 100F 1206 1206 1206 1206 1206 4.7F 0805 0805 200F 1206 147F 1206 100F 1206 100F 1206 100F 1206 1206 1206 1206 1206 4.7F 0805 0805 0805 1206 0805 0805 RADJ 1.87M 953k 549k 383k 324k 274k 226k 154k 93.1k 1.87M 953k 549k 383k 324k 274k 226k 154k 93.1k 1.87M 953k 549k 383k 324k 274k 226k 154k 93.1k 53.6k 1.87M 953k 549k 383k 324k 274k 226k 154k 93.1k 53.6k 42.2k 154k 93.1k 53.6k BIAS 2.8V, <16V 2.8V, <16V 2.8V, <16V 2.8V, <16V 2.8V, <16V 2.8V, <16V 2.8V, <16V 2.8V, <16V 2.8V, <16V 2.8V, <16V 2.8V, <16V 2.8V, <16V 2.8V, <16V 2.8V, <16V 2.8V, <16V 2.8V, <16V 2.8V, <16V 2.8V, <16V 2.8V, <16V 2.8V, <16V 2.8V, <16V 2.8V, <16V 2.8V, <16V 2.8V, <16V fOPTIMAL (kHz) RT(OPTIMAL) 150k 124k 105k 88.7k 69.8k 61.9k 49.9k 49.9k 105k 88.7k 69.8k 61.9k 49.9k 49.9k 150k 124k 69.8k 61.9k 49.9k 49.9k 49.9k 150k 124k 105k 88.7k 69.8k 49.9k 39.2k 49.9k 54.9k 61.9k 39.2k 39.2k fMAX (kHz) 1000 1100 1200 1300 1450 1400 1200 1150 1000 1100 1600 RT(MIN) 150k 124k 105k 88.7k 69.8k 61.9k 54.9k 42.2k 34.8k 49.9k 43.2k 39.2k 29.4k 26.7k 23.7k 21.0k 18.2k 19.6k 23.7k 150k 69.8k 54.9k 44.2k 42.2k 39.2k 34.8k 25.5k 29.4k 39.2k 150k 124k 105k 88.7k 69.8k 61.9k 54.9k 42.2k 34.8k 39.2k 42.2k 39.2k 26.7k 15.8k
8023f
LTM8023 APPLICATIONS INFORMATION
audio frequencies, generating audible noise. Since LTM8023 operates lower current limit during Burst Mode operation, noise typically very quiet casual ear. this audible noise unacceptable, high performance electrolytic capacitor output. input capacitor parallel combination 2.2F ceramic capacitor cost electrolytic capacitor. final precaution regarding ceramic capacitors concerns maximum input voltage rating LTM8023. ceramic input capacitor combined with trace cable inductance forms high (under damped) tank circuit. LTM8023 circuit plugged into live supply, input voltage ring twice nominal value, possibly exceeding device's rating. This situation easily avoided; Hot-Plugging Safely section. Frequency Selection LTM8023 uses constant frequency architecture that programmed switch from 200kHz 2.4MHz using resistor tied from ground. Table provides list resistor values their resultant frequencies.
Table Switching Frequency Value
SWITCHING FREQUENCY (MHz) VALUE 88.7 68.1 56.2 46.4 40.2 29.4 23.7 19.1 16.2 13.3 11.5 9.76 8.66
Operating Frequency Tradeoffs recommended that user apply optimal value given Table input output operating condition. System level other considerations, however, necessitate another operating frequency. While LTM8023 flexible enough accommodate wide range operating frequencies, haphazardly chosen result undesirable operation under certain operating fault conditions. frequency that high reduce efficiency, generate excessive heat even damage LTM8023 output overloaded short circuited. frequency that result final design that much output ripple large output cap. maximum frequency (and attendant value) which LTM8023 should allowed switch given Table f(MAX) column, while recommended frequency (and value) optimal efficiency over given input condition given fOPTIMAL column. There additional conditions that must satisfied synchronization function used. Please refer Synchronization section details. BIAS Considerations BIAS used provide drive power internal power switching stage operate internal circuitry. proper operation, must powered least 2.8V. output voltage programmed 2.8V higher, simply BIAS VOUT. VOUT less than 2.8V, BIAS tied some other voltage source. cases, ensure that maximum voltage BIAS both less than BIAS less than 56V. BIAS power applied from remote noisy voltage source, necessary apply decoupling capacitor locally LTM8023. Load Sharing more LTM8023's paralleled produce higher currents. this, VIN, ADJ, VOUT SHARE pins paralleled LTM8023's together. ensure
8023f
LTM8023 APPLICATIONS INFORMATION
that paralleled modules start together, RUN/SS pins tied together, well. RUN/SS pins tied together, make sure that same valued soft-start capacitors used each module. example LTM8023 modules configured load sharing given Typical Applications section. Burst Mode Operation enhance efficiency light loads, LTM8023 automatically switches Burst Mode operation which keeps output capacitor charged proper voltage while minimizing input quiescent current. During Burst Mode operation, LTM8023 delivers single cycle bursts current output capacitor followed sleep periods where output power delivered load output capacitor. addition, BIAS quiescent currents reduced typically respectively during sleep time. load current decreases towards load condition, percentage time that LTM8023 operates sleep mode increases average input current greatly reduced, resulting higher efficiency. Burst Mode operation enabled tying SYNC GND. disable Burst Mode operation, SYNC stable voltage above 0.7V. leave SYNC floating. Minimum Input Voltage LTM8023 step down converter, minimum amount headroom required keep output regulation. addition, input voltage required turn higher than that required run, depends upon whether RUN/SS used. shown Figure takes only about 3.5VIN LTM8023 3.3V output light load. RUN/SS pulled VIN, takes 5.5VIN start. LTM8023 enabled RUN/SS pin, minimum voltage start light loads lower, about 4.5V. similar curve 5VOUT operation also provided Figure Soft-Start RUN/SS used soft-start LTM8023, reducing maximum input current during startup.
2ms/DIV
8023
INPUT VOLTAGE RUN/SS ENABLED VOUT 3.3V 25°C 650kHz 1000 1500 LOAD CURRENT (mA) 2000 START
INPUT VOLTAGE
START
RUN/SS ENABLED
1000 LOAD CURRENT (mA)
VOUT 25°C 650kHz 1500 2000
8023
Figure LTM8023 Needs More Voltage Start Than
RUN/SS driven through external filter create voltage ramp this pin. Figure shows startup shutdown waveforms with soft-start circuit. choosing appropriate time constant, peak startup
RUN/SS 0.22F
1A/DIV
VRUN/SS 2V/DIV
VOUT 2V/DIV
Figure Soft-Start LTM8023, Resistor Capacitor RUN/SS
8023f
LTM8023 APPLICATIONS INFORMATION
current reduced current that required regulate output, with overshoot. Choose value resistor that supply least when RUN/SS reaches 2.5V. Synchronization internal oscillator LTM8023 synchronized applying external 250kHz 2MHz clock SYNC pin. leave this floating. resistor tied from ground should chosen such that LTM8023 oscillates lower than intended synchronization frequency (see Frequency Selection section). LTM8023 will enter Burst Mode operation while synchronized external clock, will instead skip pulses maintain regulation. Shorted Input Protection Care needs taken systems where output will held high when input LTM8023 absent. This occur battery charging applications battery backup systems where battery some other supply diode OR-ed with LTM8023's output. allowed float SHDN held high (either logic signal because tied VIN), then LTM8023's internal circuitry will pull quiescent current through internal power switch. This fine your system tolerate milliamps this state. ground SHDN pin, current will drop essentially zero. However, grounded while output held high, then parasitic diodes inside LTM8023 pull large currents from output through pin. Figure shows circuit that will only when input voltage present that protects against shorted reversed input. Layout Most headaches associated with layout have been alleviated even eliminated high level integration LTM8023. LTM8023 nevertheless switching power supply, care must taken minimize ensure proper operation. Even with
COUT VOUT
8023
RUN/SS LTM8023
VOUT BIAS
VOUT
SYNC
8023
Figure Input Diode Prevents Shorted Input from Discharging Backup Battery Tied Output. Also Protects Circuit from Reversed Input. LTM8023 Runs Only When Input Present.
high level integration, fail achieve specified operation with haphazard poor layout. Figure suggested layout. Ensure that grounding heatsinking acceptable. rules keep mind are: Place RADJ resistors close possible their respective pins. Place capacitor close possible connection LTM8023. Place COUT capacitor close possible VOUT connection LTM8023.
SHARE SYNC PGOOD RUN/SS BIAS RADJ
Figure Layout Showing Suggested External Components, Plane Thermal Vias
8023f
LTM8023 APPLICATIONS INFORMATION
Place COUT capacitors such that their ground current flow directly adjacent underneath LTM8023. Connect connections large copper pour plane area possible layer. Avoid breaking ground connection between external components LTM8023. vias connect copper area boards internal ground plane. Liberally distribute these vias provide both good ground connection thermal path internal planes printed circuit board. Hot-Plugging Safely small size, robustness impedance ceramic capacitors make them attractive option input bypass capacitor LTM8023. However, these capacitors cause problems LTM8023 plugged into live supply (see Linear Technology Application Note complete discussion). loss ceramic capacitor combined with stray inductance series with power source forms under-damped tank circuit, voltage LTM8023 ring twice nominal input voltage, possibly exceeding LTM8023's rating damaging part. input supply poorly controlled user will plugging LTM8023 into energized supply, input network should designed prevent this overshoot. Figure shows waveforms that result when LTM8023 circuit connected supply through feet 24-gauge twisted pair. first plot response with 2.2F ceramic capacitor input. input voltage rings high input current peaks 20A. method damping tank circuit another capacitor with series resistor circuit. Figure aluminum electrolytic capacitor been added. This capacitor's high equivalent series resistance damps circuit eliminates voltage overshoot. extra capacitor improves frequency ripple filtering slightly improve efficiency circuit, though likely largest component circuit. alternative solution shown Figure resistor added series with input eliminate voltage overshoot also reduces peak input current). 0.1F capacitor improves high frequency filtering. This solution smaller less expensive than electrolytic capacitor. high input voltages impact efficiency minor, reducing efficiency less than half percent output full load operating from 24V. Thermal Considerations LTM8023 output current need derated required operate high ambient temperature deliver large amount continuous power. amount current derating dependent upon input voltage, output power ambient temperature. derating curves given Typical Performance Characteristics section used guide. These curves were generated LTM8023 mounted 33cm2 4-layer printed circuit board. Boards other sizes layer count exhibit different thermal behavior, incumbent upon user verify proper operation over intended system's line, load environmental operating conditions. temperature LTM8023 must lower than maximum rating 125°C, care should taken layout circuit ensure good heat sinking LTM8023. estimate junction temperature, approximate power dissipation within LTM8023 applying typical efficiency stated this datasheet desired output power, have actual module, taking power measurement. Then calculate temperature rise LTM8023 junction above surface printed circuit board multiplying module's power dissipation thermal resistance. actual thermal resistance LTM8023 printed circuit board depends upon layout circuit board, thermal resistance given page which based upon 33cm2 4-layer board, used guide. Finally, aware that high ambient temperatures internal Schottky diode will have significant leakage current (see Typical Performance Characteristics) increasing quiescent current LTM8023.
8023f
LTM8023 APPLICATIONS INFORMATION
CLOSING SWITCH SIMULATES PLUG LTM8023 DANGER 20V/DIV RINGING EXCEED ABSOLUTE MAXIMUM RATING
4.7F
IMPEDANCE ENERGIZED SUPPLY
STRAY INDUCTANCE FEET METERS) TWISTED PAIR
10A/DIV 20s/DIV
(6a)
LTM8023 20V/DIV
0.1F 4.7F 10A/DIV
(6b)
20s/DIV
LTM8023
20V/DIV
AI.EI.
4.7F 10A/DIV
(6c)
20s/DIV
8023
Figure Well Chosen Input Network Prevents Input Voltage Overshoot Ensures Reliable Operation When LTM8023 Connected Live Supply
8023f
LTM8023 TYPICAL APPLICATIONS
0.82V Step-Down Converter
3.6V BIAS RUN/SS LTM8023 SHARE PGOOD SYNC
8023 TA02
VOUT 200F
VOUT 0.82V
105k
1.8V Step-Down Converter
3.6V 4.7F BIAS RUN/SS LTM8023 SHARE PGOOD SYNC
8023 TA03
VOUT 100F
VOUT 1.8V
383k
8023f
LTM8023 TYPICAL APPLICATIONS
2.5V Step-Down Converter
4.5V 36VDC 2.2F RUN/SS SHARE LTM8023 3.3V BIAS PGOOD SYNC
8023 TA04
VOUT
VOUT 2.5V
61.9k
226k
Step-Down Converter
7.5V 36VDC 2.2F RUN/SS VOUT BIAS 4.7F LTM8023 SHARE PGOOD SYNC
8023 TA05
VOUT
49.9k
93.1k
8023f
LTM8023 TYPICAL APPLICATIONS
Positive Negative Converter
RUN/SS VOUT BIAS LOAD CURRENT (mA) 2000 2500
Positive Negative Converter Load Current Input Voltage
LTM8023 2.2F SHARE PGOOD 39.2k SYNC
8023 TA06
1500
1000
93.1k INPUT VOLTAGE
8023 TA06b
LTM8023's Parallel, 3.3V
6.5V VOUT RUN/SS LTM8023 SHARE 2.2F SYNC 49.9k 76.8k PGOOD BIAS VOUT 3.3V
2.2k RUN/SS LTM8023 SHARE 2.2F 0.22F
VOUT BIAS
PGOOD
SYNC
8023 TA08
49.9k
8023f
Package 50-Lead (11.25mm 9.00mm 2.82mm)
(Reference 05-08-1804
LTM8023
PACKAGE
CORNER
4.445
3.175
1.905
0.635
0.000
0.635
1.905
3.175
4.445
0.9525
SUGGESTED LAYOUT VIEW
0.635
0.3175
11.25 2.72 2.92 0.605 0.665 9.00 0.27 0.37 2.45 2.55 MOLD SUBSTRATE 7.62 1.27 PADS NOTES DETAIL PACKAGE SIDE VIEW
8.89 0.605 0.665
DETAIL
PACKAGE VIEW
PACKAGE BOTTOM VIEW
C(0.30)
NOTES: DIMENSIONING TOLERANCING ASME Y14.5M-1994 DIMENSIONS MILLIMETERS LAND DESIGNATION JESD MO-222, SPP-010 SPP-020 DETAILS IDENTIFIER OPTIONAL, MUST LOCATED WITHIN ZONE INDICATED. IDENTIFIER EITHER MOLD MARKED FEATURE
3.810
2.540
1.270
PRIMARY DATUM SEATING PLANE TOTAL NUMBER PADS:
LTMXXXXXX Module
0.000
0.3175
0.3175
1.270
SYMBOL TOLERANCE 0.15 0.10
TRAY BEVEL PACKAGE TRAY LOADING ORIENTATION
0507
2.540
3.810
8023f
LTM8023 PACKAGE Table Assignment (Sorted Number)
SIGNAL DESCRIPTION VOUT VOUT VOUT VOUT VOUT VOUT VOUT VOUT VOUT VOUT VOUT VOUT SIGNAL DESCRIPTION SHARE BIAS SYNC RUN/SS PGOOD
8023f
Information furnished Linear Technology Corporation believed accurate reliable. However, responsibility assumed use. Linear Technology Corporation makes representation that interconnection circuits described herein will infringe existing patent rights.
LTM8023 TYPICAL APPLICATION
5.5V RUN/SS VOUT BIAS VOUT 3.3V
LTM8023 2.2F SHARE 49.9k SYNC
8023 TA07
154k
RELATED PARTS
PART NUMBER LTM4600/LTM4602 LTM4601/LTM4603 LTM4604 LTM8020 LTM8022 DESCRIPTION DC/DC Module DC/DC Module DC/DC Module 200mA, DC/DC Module DC/DC Module COMMENTS Compatible, 4.5V 28V, 15mm 15mm 2.8mm Package Compatible; Remote Sensing; PLL, Tracking Margining, 4.5V 2.375V 5.5V, 0.8V VOUT 15mm 2.3mm Package 36V, 1.25V VOUT 6.25mm 6.25mm 2.32mm Package 3.6V 36V, 0.8V VOUT 10V, 11.25mm 2.82mm Package
8023f
Linear Technology Corporation
(408) 432-1900
1207 PRINTED
1630 McCarthy Blvd., Milpitas, 95035-7417
FAX: (408) 434-0507 www.linear.com
LINEAR TECHNOLOGY CORPORATION 2007

LTM®8023 complete DC/DC step-down power supply. Included package switc

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