Texas Instruments LM2734 Manual Download

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LM2734

VIN

BOOST

GND

R 2

OUT

12V

3.3V

OFF

LM2734

www.ti.com

SNVS288I – SEPTEMBER 2004 – REVISED APRIIL 2013

Figure 33. LM2734Y (550kHz)

BOOST

Derived from V

OUT

12V to 3.3V/1A

Table 7. Bill of Materials for

Figure 33

Part ID

Part Value

Part Number

Manufacturer

1A Buck Regulator

LM2734Y

Texas Instruments

C1, Input Cap

10µF, 25V, X7R

C3225X7R1E106M

TDK

C2, Output Cap

22µF, 6.3V, X5R

C3216X5ROJ226M

TDK

C3, Boost Cap

0.01µF, 16V, X7R

C1005X7R1C103K

TDK

D1, Catch Diode

0.34V

Schottky 1A, 30VR

SS1P3L

Vishay

D2, Boost Diode

0.6V

@ 30mA Diode

BAT17

Vishay

10µH, 1.6A,

SLF7032T-100M1R4

TDK

31.6k

Ω

, 1%

CRCW06033162F

Vishay

10.0 k

Ω

, 1%

CRCW06031002F

Vishay

100k

Ω

, 1%

CRCW06031003F

Vishay

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LM2734

Summary of Contents for LM2734

Page 1: ...M2734YQ are AEC Q100 Grade 1 LM2734X allowing the use of extremely small Qualified and are Manufactured on an surface mount inductors and chip capacitors Even Automotive Grade Flow though the operating frequencies are very high efficiencies up to 90 are easy to achieve External APPLICATIONS shutdown is included featuring an ultra low stand by current of 30nA The LM2734 utilizes current mode Local ...

Page 2: ... pin Place the bottom resistor of the feedback network as close as possible to this pin for accurate regulation 3 FB Feedback pin Connect FB to the external resistor divider to set output voltage 4 EN Enable control input Logic high enables operation Do not allow this pin to float or be greater than VIN 0 3V 5 VIN Input supply voltage Connect a bypass capacitor to this pin 6 SW Output switch Conne...

Page 3: ...man body model 1 5kΩ in series with 100pF Operating Ratings 1 VIN 3V to 20V SW Voltage 0 5V to 20V Boost Voltage 0 5V to 25V Boost to SW Voltage 1 6V to 5 5V Junction Temperature Range 40 C to 125 C Thermal Resistance θJA 2 118 C W 1 Absolute Maximum Ratings indicate limits beyond which damage to the device may occur Operating Ratings indicate conditions for which the device is intended to be func...

Page 4: ...ling 2 0 2 3 V UVLO Hysteresis 0 30 0 44 0 62 LM2734X 1 2 1 6 1 9 FSW Switching Frequency MHz LM2734Y 0 40 0 55 0 66 LM2734X 85 92 DMAX Maximum Duty Cycle LM2734Y 90 96 LM2734X 2 DMIN Minimum Duty Cycle LM2734Y 1 RDS ON Switch ON Resistance VBOOST VSW 3V 300 600 mΩ ICL Switch Current Limit VBOOST VSW 3V 1 2 1 7 2 5 A IQ Quiescent Current Switching 1 5 2 5 mA Quiescent Current shutdown VEN 0V 30 nA...

Page 5: ...ise Efficiency vs Load Current X VOUT 5V Efficiency vs Load Current Y VOUT 5V Figure 5 Figure 6 Efficiency vs Load Current X VOUT 3 3V Efficiency vs Load Current Y VOUT 3 3V Figure 7 Figure 8 Efficiency vs Load Current X VOUT 1 5V Efficiency vs Load Current Y VOUT 1 5V Figure 9 Figure 10 Copyright 2004 2013 Texas Instruments Incorporated Submit Documentation Feedback 5 Product Folder Links LM2734 ...

Page 6: ...unless specified otherwise Oscillator Frequency vs Temperature X Oscillator Frequency vs Temperature Y Figure 11 Figure 12 Current Limit vs Temperature Current Limit vs Temperature VIN 5V VIN 20V Figure 13 Figure 14 VFB vs Temperature RDSON vs Temperature Figure 15 Figure 16 6 Submit Documentation Feedback Copyright 2004 2013 Texas Instruments Incorporated Product Folder Links LM2734 ...

Page 7: ...A 25 C unless specified otherwise Line Regulation X IQ Switching vs Temperature VOUT 1 5V IOUT 500mA Figure 17 Figure 18 Line Regulation Y Line Regulation X VOUT 1 5V IOUT 500mA VOUT 3 3V IOUT 500mA Figure 19 Figure 20 Line Regulation Y VOUT 3 3V IOUT 500mA Figure 21 Copyright 2004 2013 Texas Instruments Incorporated Submit Documentation Feedback 7 Product Folder Links LM2734 ...

Page 8: ...d Enable Circuit Oscillator Driver 0 3 Switch Internal Compensation SW EN FB GND Error Amplifier VREF 0 8V COUT ON OFF VBOOST IL VSW CBOOST VOUT CIN VIN VIN ISENSE 0 88V OVP Comparator Error Signal LM2734 SNVS288I SEPTEMBER 2004 REVISED APRIIL 2013 www ti com Block Diagram Figure 22 8 Submit Documentation Feedback Copyright 2004 2013 Texas Instruments Incorporated Product Folder Links LM2734 ...

Page 9: ...ncreases with a linear slope IL is measured by the current sense amplifier which generates an output proportional to the switch current The sense signal is summed with the regulator s corrective ramp and compared to the error amplifier s output which is proportional to the difference between the feedback voltage and VREF When the PWM comparator output goes high the output switch turns off until th...

Page 10: ...ed across CBOOST is VBOOST VSW VIN VFD2 VFD1 1 When the NMOS switch turns on TON the switch pin rises to VSW VIN RDSON x IL 2 forcing VBOOST to rise thus reverse biasing D2 The voltage at VBOOST is then VBOOST 2VIN RDSON x IL VFD2 VFD1 3 which is approximately 2VIN 0 4V 4 for many applications Thus the gate drive voltage of the NMOS switch is approximately VIN 0 2V 5 An alternate method for chargi...

Page 11: ...NER is 1 mA The current IBOOST into the BOOST pin supplies the gate current of the NMOS control switch and varies typically according to the following formula for the X version IBOOST 0 56 x D 0 54 x VZENER VD2 mA 6 IBOOST can be calculated for the Y version using the following IBOOST 0 22 x D 0 54 x VZENER VD2 µA 7 where D is the duty cycle VZENER and VD2 are in volts and IBOOST is in milliamps V...

Page 12: ...itch is turned off which allows the output voltage to decrease toward regulation UNDERVOLTAGE LOCKOUT Undervoltage lockout UVLO prevents the LM2734 from operating until the input voltage exceeds 2 74V typ The UVLO threshold has approximately 440mV of hysteresis so the part will operate until VIN drops below 2 3V typ Hysteresis prevents the part from turning off during power up if VIN is non monoto...

Page 13: ...ration will result in a sudden reduction in inductance and prevent the regulator from operating correctly Because of the speed of the internal current limit the peak current of the inductor need only be specified for the required maximum output current For example if the designed maximum output current is 0 5A and the peak current is 0 7A then the inductor should be specified with a saturation cur...

Page 14: ...the two external components that control the stability of the regulator control loop most applications will require a minimum at 10 µF of output capacitance Capacitance can be increased significantly with little detriment to the regulator stability Like the input capacitor recommended multilayer ceramic capacitors are X7R or X5R Again verify actual capacitance at the desired operating voltage and ...

Page 15: ...GND of the IC The VOUT trace to R1 should be routed away from the inductor and any other traces that are switching High AC currents flow through the VIN SW and VOUT traces so they should be as short and wide as possible However making the traces wide increases radiated noise so the designer must make this trade off Radiated noise can be decreased by choosing a shielded inductor The remaining compo...

Page 16: ...M2734X C1 Input Cap 10µF 25V X7R C3225X7R1E106M TDK C2 Output Cap 22µF 6 3V X5R C3216X5ROJ226M TDK C3 Boost Cap 0 01µF 16V X7R C1005X7R1C103K TDK CFF 1000pF 25V C0603X5R1E102K TDK D1 Catch Diode 0 34VF Schottky 1A 30VR SS1P3L Vishay D2 Boost Diode 1VF 50mA Diode 1N4148W Diodes Inc L1 4 7µH 1 7A VLCF4020T 4R7N1R2 TDK R1 31 6kΩ 1 CRCW06033162F Vishay R2 10kΩ 1 CRCW06031002F Vishay R3 100kΩ 1 CRCW060...

Page 17: ...1E106M TDK C2 Output Cap 22µF 6 3V X5R C3216X5ROJ226M TDK C3 Boost Cap 0 01µF 16V X7R C1005X7R1C103K TDK C4 Shunt Cap 0 1µF 6 3V X5R C1005X5R0J104K TDK D1 Catch Diode 0 4VF Schottky 1A 30VR SS1P3L Vishay D2 Boost Diode 1VF 50mA Diode 1N4148W Diodes Inc D3 Zener Diode 5 1V 250Mw SOT BZX84C5V1 Vishay L1 6 8µH 1 6A SLF7032T 6R8M1R6 TDK R1 8 87kΩ 1 CRCW06038871F Vishay R2 10 2kΩ 1 CRCW06031022F Vishay...

Page 18: ...struments C1 Input Cap 10µF 25V X7R C3225X7R1E106M TDK C2 Output Cap 22µF 6 3V X5R C3216X5ROJ226M TDK C3 Boost Cap 0 01µF 16V X7R C1005X7R1C103K TDK D1 Catch Diode 0 4VF Schottky 1A 30VR SS1P3L Vishay D2 Boost Diode 1VF 50mA Diode 1N4148W Diodes Inc D3 Zener Diode 11V 350Mw SOT BZX84C11T Diodes Inc L1 6 8µH 1 6A SLF7032T 6R8M1R6 TDK R1 8 87kΩ 1 CRCW06038871F Vishay R2 10 2kΩ 1 CRCW06031022F Vishay...

Page 19: ...struments C1 Input Cap 10µF 25V X7R C3225X7R1E106M TDK C2 Output Cap 22µF 16V X5R C3216X5R1C226M TDK C3 Boost Cap 0 01µF 16V X7R C1005X7R1C103K TDK D1 Catch Diode 0 4VF Schottky 1A 30VR SS1P3L Vishay D2 Boost Diode 1VF 50mA Diode 1N4148W Diodes Inc D3 Zener Diode 4 3V 350mw SOT BZX84C4V3 Diodes Inc L1 6 8µH 1 6A SLF7032T 6R8M1R6 TDK R1 102kΩ 1 CRCW06031023F Vishay R2 10 2kΩ 1 CRCW06031022F Vishay ...

Page 20: ...gulator LM2734Y Texas Instruments C1 Input Cap 10µF 6 3V X5R C3216X5ROJ106M TDK C2 Output Cap 22µF 6 3V X5R C3216X5ROJ226M TDK C3 Boost Cap 0 01µF 16V X7R C1005X7R1C103K TDK D1 Catch Diode 0 3VF Schottky 1A 10VR MBRM110L ON Semi D2 Boost Diode 1VF 50mA Diode 1N4148W Diodes Inc L1 10µH 1 6A SLF7032T 100M1R4 TDK R1 8 87kΩ 1 CRCW06038871F Vishay R2 10 2kΩ 1 CRCW06031022F Vishay R3 100kΩ 1 CRCW0603100...

Page 21: ...lator LM2734Y Texas Instruments C1 Input Cap 10µF 25V X7R C3225X7R1E106M TDK C2 Output Cap 22µF 6 3V X5R C3216X5ROJ226M TDK C3 Boost Cap 0 01µF 16V X7R C1005X7R1C103K TDK D1 Catch Diode 0 34VF Schottky 1A 30VR SS1P3L Vishay D2 Boost Diode 0 6VF 30mA Diode BAT17 Vishay L1 10µH 1 6A SLF7032T 100M1R4 TDK R1 31 6kΩ 1 CRCW06033162F Vishay R2 10 0 kΩ 1 CRCW06031002F Vishay R3 100kΩ 1 CRCW06031003F Visha...

Page 22: ...R1E106M TDK C2 Output Cap 22µF 6 3V X5R C3216X5ROJ226M TDK C3 Boost Cap 0 01µF 16V X7R C1005X7R1C103K TDK C4 Shunt Cap 0 1µF 6 3V X5R C1005X5R0J104K TDK D1 Catch Diode 0 4VF Schottky 1A 30VR SS1P3L Vishay D2 Boost Diode 1VF 50mA Diode 1N4148W Diodes Inc D3 Zener Diode 5 1V 250Mw SOT BZX84C5V1 Vishay L1 15µH 1 5A SLF7045T 150M1R5 TDK R1 8 87kΩ 1 CRCW06038871F Vishay R2 10 2kΩ 1 CRCW06031022F Vishay...

Page 23: ...struments C1 Input Cap 10µF 25V X7R C3225X7R1E106M TDK C2 Output Cap 22µF 6 3V X5R C3216X5ROJ226M TDK C3 Boost Cap 0 01µF 16V X7R C1005X7R1C103K TDK D1 Catch Diode 0 4VF Schottky 1A 30VR SS1P3L Vishay D2 Boost Diode 1VF 50mA Diode 1N4148W Diodes Inc D3 Zener Diode 11V 350Mw SOT BZX84C11T Diodes Inc L1 15µH 1 5A SLF7045T 150M1R5 TDK R1 8 87kΩ 1 CRCW06038871F Vishay R2 10 2kΩ 1 CRCW06031022F Vishay ...

Page 24: ...truments C1 Input Cap 10µF 25V X7R C3225X7R1E106M TDK C2 Output Cap 22µF 16V X5R C3216X5R1C226M TDK C3 Boost Cap 0 01µF 16V X7R C1005X7R1C103K TDK D1 Catch Diode 0 4VF Schottky 1A 30VR SS1P3L Vishay D2 Boost Diode 1VF 50mA Diode 1N4148W Diodes Inc D3 Zener Diode 4 3V 350mw SOT BZX84C4V3 Diodes Inc L1 22µH 1 4A SLF7045T 220M1R3 1PF TDK R1 102kΩ 1 CRCW06031023F Vishay R2 10 2kΩ 1 CRCW06031022F Visha...

Page 25: ...D APRIIL 2013 REVISION HISTORY Changes from Revision H April 2013 to Revision I Page Changed layout of National Data Sheet to TI format 24 Copyright 2004 2013 Texas Instruments Incorporated Submit Documentation Feedback 25 Product Folder Links LM2734 ...

Page 26: ...B LM2734YQMKE NOPB ACTIVE SOT DDC 6 250 Green RoHS no Sb Br CU SN Level 1 260C UNLIM 40 to 125 SVCB LM2734YQMKX NOPB ACTIVE SOT DDC 6 3000 Green RoHS no Sb Br CU SN Level 1 260C UNLIM 40 to 125 SVCB 1 The marketing status values are defined as follows ACTIVE Product device recommended for new designs LIFEBUY TI has announced that the device will be discontinued and a lifetime buy period is in effe...

Page 27: ...le material finish options Finish options are separated by a vertical ruled line Lead Ball Finish values may wrap to two lines if the finish value exceeds the maximum column width Important Information and Disclaimer The information provided on this page represents TI s knowledge and belief as of the date that it is provided TI bases its knowledge and belief on information provided by third partie...

Page 28: ... 8 4 3 2 3 2 1 4 4 0 8 0 Q3 LM2734XQMKX NOPB SOT DDC 6 3000 178 0 8 4 3 2 3 2 1 4 4 0 8 0 Q3 LM2734YMK SOT DDC 6 1000 178 0 8 4 3 2 3 2 1 4 4 0 8 0 Q3 LM2734YMK NOPB SOT DDC 6 1000 178 0 8 4 3 2 3 2 1 4 4 0 8 0 Q3 LM2734YMKX SOT DDC 6 3000 178 0 8 4 3 2 3 2 1 4 4 0 8 0 Q3 LM2734YMKX NOPB SOT DDC 6 3000 178 0 8 4 3 2 3 2 1 4 4 0 8 0 Q3 LM2734YQMK NOPB SOT DDC 6 1000 178 0 8 4 3 2 3 2 1 4 4 0 8 0 Q3...

Page 29: ... 6 250 210 0 185 0 35 0 LM2734XQMKX NOPB SOT DDC 6 3000 210 0 185 0 35 0 LM2734YMK SOT DDC 6 1000 210 0 185 0 35 0 LM2734YMK NOPB SOT DDC 6 1000 210 0 185 0 35 0 LM2734YMKX SOT DDC 6 3000 210 0 185 0 35 0 LM2734YMKX NOPB SOT DDC 6 3000 210 0 185 0 35 0 LM2734YQMK NOPB SOT DDC 6 1000 210 0 185 0 35 0 LM2734YQMKE NOPB SOT DDC 6 250 210 0 185 0 35 0 LM2734YQMKX NOPB SOT DDC 6 3000 210 0 185 0 35 0 PA...

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Page 32: ...esponsible for compliance with all legal regulatory and safety related requirements concerning its products and any use of TI components in its applications notwithstanding any applications related information or support that may be provided by TI Buyer represents and agrees that it has all the necessary expertise to create and implement safeguards which anticipate dangerous consequences of failur...

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