Linear Technology Analog Devices LT8607 Скачать руководство пользователя страница 17

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LT8607/LT8607B

Rev. C

For more information

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TYPICAL APPLICATIONS

5V, 2MHz Step-Down

3.3V, 2MHz Step-Down

12V, 1MHz Step-Down

0.1µF

4.7µF

X7R

1206

1µF

22µF

X7R

1206

8607 TA02

10pF

4.7µH

18.2k

187k

L1: XFL4020-472ME

100k

10nF

EN/UV
SYNC

LT8607

INTV

TR/SS

GND

BST

5.6V to 42V

OUT

750mA

POWER

GOOD

= 2MHz

0.1µF

4.7µF

X7R

1206

1µF

22µF

X7R

1206

8607 TA03

10pF

2.2µH

18.2k

309k

L1: XFL3012-222ME

100k

10nF

EN/UV
SYNC

LT8607

INTV

TR/SS

GND

BST

3.9V to 42V

OUT

3.3V

750mA

POWER

GOOD

= 2MHz

0.1µF

4.7µF

X7R

1206

1µF

22µF

X7R

1206

8607 TA04

10pF

22µH

40.2k

69.8k

L1: MSS6132-223ML

100k

10nF

EN/UV
SYNC

LT8607

INTV

TR/SS

GND

BST

12.7V to 42V

OUT

12V

750mA

POWER

GOOD

= 1MHz

Содержание Analog Devices LT8607

Страница 1: ...rt or tracking The DFN pack age omits these pins and can be purchased in pulse skip ping or Burst Mode operation APPLICATIONS Wide Input Voltage Range 3 0V to 42V Ultralow Quiescent Current Burst Mode...

Страница 2: ...erature ranges The temperature grade is identified by a label on the shipping container Tape and reel specifications Some packages are available in 500 unit reels through designated sales channels wit...

Страница 3: ...time PARAMETER CONDITIONS MIN TYP MAX UNITS Feedback Reference Voltage MSOP Package VIN 6V ILOAD 100mA VIN 6V ILOAD 100mA l 0 774 0 762 0 778 0 778 0 782 0 798 V V DFN Package VIN 6V ILOAD 100mA VIN 6...

Страница 4: ...0 25 CHANGE IN V OUT 8607 G06 TA 25 C unless otherwise noted fSW 2MHz VIN 12V VIN 24V L 4 7 H SYNC 0V OR LT8607 DFN IOUT mA 0 125 250 375 500 625 750 50 55 60 65 70 75 80 85 90 95 100 EFFICIENCY 8607...

Страница 5: ...30 50 70 90 110 130 150 80 85 90 95 100 105 110 MINIMUM OFF TIME ns 8607 G15 TYPICAL PERFORMANCE CHARACTERISTICS Top FET Current Limit vs Duty Cycle Top FET Current Limit vs Temperature Switch Drop vs...

Страница 6: ...1 0 2 0 3 0 4 0 5 0 6 0 7 0 8 0 9 1 0 FB VOLTAGE V 8607 G21 TEMPERATURE C 50 30 10 10 30 50 70 90 110 130 150 1 5 1 6 1 7 1 8 1 9 2 0 2 1 2 2 2 3 2 4 2 5 SOFT START CURRENT A 8607 G22 VIN VOUT RLOAD...

Страница 7: ...VIN 12V VOUT 5V 250mA TO 750mA COUT 22 F fSW 2MHz 200ns DIV ILOAD 200mA DIV VSW 10V DIV 8607 G27 36VIN TO 5VOUT AT 500mA 2MHz 2 s DIV VOUT 20mV DIV ILOAD 200mA DIV VSW 10V DIV 8607 G28 12VIN TO 5VOUT...

Страница 8: ...ack resistor divider tap to this pin TR SS MSOP Only Output Tracking and Soft Start Pin This pin allows user control of output voltage ramp rate during start up A TR SS voltage below 0 778V forces the...

Страница 9: ...n reducing the input supply current to 1 7 A In a typical application 3 0 A will be consumed from the input supply when regulating with no load The SYNC pin is tied low to use Burst Mode operation and...

Страница 10: ...ase but only up to the switching frequency programmed by the resistor at the RT pin as shown in Table 1 The output load at which the LT8607 reaches the programmed frequency varies based on input volta...

Страница 11: ...ller inductor and capacitor values may be used The disadvan tages are lower efficiency and a smaller input voltage range The highest switching frequency fSW MAX for a given application can be calculat...

Страница 12: ...um output current IOUT MAX which is a function of the switch current limit ILIM and the ripple current IOUT MAX ILIM IL 2 The peak to peak ripple current in the inductor can be calculated as follows I...

Страница 13: ...en VOUT and FB Increasing the output capacitance will also decrease the output voltage ripple A lower value of output capacitor can be used to save space and cost but transient performance will suffer...

Страница 14: ...SS pin voltage For output tracking applications TR SS APPLICATIONS INFORMATION can be externally driven by another voltage source From 0V to 0 778V the TR SS voltage will override the internal 0 778V...

Страница 15: ...Input Protection The LT8607 will tolerate a shorted output Several features are used for protection during output short circuit and brownout conditions The first is the switching frequency will be fo...

Страница 16: ...on if safe junction temperature is exceeded PCB Layout For proper operation and minimum EMI care must be taken during printed circuit board layout Note that large switched currents flow in the LT8607...

Страница 17: ...N 5 6V to 42V VOUT 5V 750mA POWER GOOD fSW 2MHz C1 0 1 F C2 4 7 F X7R 1206 C3 1 F C4 22 F X7R 1206 8607 TA03 C5 10pF L1 2 2 H R1 18 2k R2 1M R3 309k L1 XFL3012 222ME R4 100k C6 10nF VIN EN UV SYNC LT8...

Страница 18: ...10nF VIN EN UV SYNC LT8607 INTVCC TR SS RT GND FB PG SW BST VIN 3 2V to 20V 42V TRANSIENT VOUT 1 8V 750mA POWER GOOD fSW 2MHz C1 0 1 F C2 4 7 F C9 33 F C7 4 7 F C8 4 7 F C3 1 F C4 22 F X7R 1206 8607...

Страница 19: ...EAD FLASH OR PROTRUSIONS INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0 152mm 006 PER SIDE 5 LEAD COPLANARITY BOTTOM OF LEADS AFTER FORMING SHALL BE 0 102mm 004 MAX 6 EXPOSED PAD DIMENSION DOES INC...

Страница 20: ...BE SOLDER PLATED 6 SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE TOP AND BOTTOM OF PACKAGE 0 55 0 05 BOTTOM VIEW EXPOSED PAD 0 23 REF 0 335 REF 0 335 REF 0 75 0 05 1 4 8 5 PIN 1 BAR TOP MA...

Страница 21: ...st paragraph and Figure 2 to include DFN option Clarified Applications section to include DFN operation Added DFN Package Description 1 2 2 3 6 8 9 10 14 15 20 B 11 17 Added H grade option Clarified O...

Страница 22: ...s LT8614 42V 4A 96 Efficiency 2 2MHz Synchronous MicroPower Step Down DC DC Converter with IQ 2 5 A VIN 3 4V to 42V VOUT 0 97V IQ 2 5 A ISD 1 A 3mm 4mm QFN 18 Package LT8612 42V 6A 96 Efficiency 2 2MH...

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