TPS56121DQPR datasheet(3/22 Pages) TI1

부품명	TPS56121DQPR

상세설명	4.5-V to 14-V Input High-Current Synchronous Buck Converter

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제조업체	TI1 [Texas Instruments]

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TPS56121

www.ti.com

SLUSAH4

– MARCH 2011

ELECTRICAL CHARACTERISTICS

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNITS

VOLTAGE REFERENCE

TJ = 25°C, 4.5 V ≤ VVDD ≤ 14 V

597

600

603

VFB

FB input voltage

mV

–40°C ≤ TJ ≤ 125°C,

594

600

606

4.5 V

≤ VVDD ≤ 14 V

INPUT SUPPLY

VVDD

Input supply voltage range

4.5

14

V

IVDDSD

Shutdown supply current

VEN/SS = 0.2 V

80

120

µA

IVDDQ

Quiescent, non-switching

Let EN/SS float, VFB = 1 V

2.5

5.0

mA

VUVLO

UVLO ON Voltage

4.0

4.3

V

VUVLO(HYS)

UVLO hysteresis

500

700

mV

ENABLE/SOFT-START

VIH

High-level input voltage, EN/SS

0.55

0.70

1.00

V

VIL

Low-level input voltage, EN/SS

0.27

0.30

0.33

V

ISS

Soft-start source current

8

10

12

µA

Soft-start voltage level

– Start of

VSS

0.4

0.8

1.3

V

ramp

BP REGULATOR

VBP

Output voltage

IBP = 10 mA

6.2

6.5

6.8

V

Regulator dropout voltage, VVDD –

VDO

IBP = 25 mA, VVDD = 4.5 V

70

125

mV

VBP

OSCILLATOR

RCOMP = 40.2 kΩ, 4.5 V ≤ VVDD ≤ 14 V

270

300

330

kHz

fSW

Switching Frequency

RCOMP = open, 4.5 V ≤ VVDD ≤ 14 V

450

500

550

kHz

RCOMP = 13.3 kΩ, 4.5 V ≤ VVDD ≤ 14 V

0.8

0.95

1.1

MHz

VRAMP

(1)

Ramp amplitude

VVDD/6.6

VVDD/6 VVDD/5.4

V

PWM

fsw = 300 kHz, VFB = 0 V,

93%

4.5 V

≤ VVDD ≤ 14 V

fsw = 500 kHz, VFB = 0 V,

DMAX

(1)

Maximum duty cycle

90%

4.5 V

≤ VVDD ≤ 14 V

fsw = 1 MHz, VFB = 0 V,

85%

4.5 V

≤ VVDD ≤ 14 V

tON(min)

(1)

Minimum controllable pulse width

100

ns

ERROR AMPLIFIER

GBWP (1)

Gain bandwidth product

10

24

MHz

AOL

(1)

Open loop gain

60

dB

Input bias current (current out of FB

IIB

VFB = 0.6 V

75

nA

pin)

IEAOP

Output source current

VFB = 0 V

1.5

mA

IEAOM

Output sink current

VFB = 1 V

1.5

mA

POWER GOOD

Feedback upper voltage limit for

VOV

655

675

700

mV

PGOOD

Feedback lower voltage limit for

VUV

500

525

550

PGOOD

VPGD-HYST

PGOOD hysteresis voltage at FB

30

45

RPGD

PGOOD pull down resistance

VFB = 0 V, IFB = 5 mA

30

70

Ω

550 mV

< VFB < 655 mV,

IPGDLK

PGOOD leakage current

10

20

µA

VPGOOD = 5 V

(1)

Ensured by design. Not production tested

Copyright

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