LM21212MHX-1 datasheet(4/33 Pages) TI1

部品番号	LM21212MHX-1

部品情報	12A High Efficiency Synchronous Point of Load Buck Regulator

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LM21212-1

SNVS671E – FEBRUARY 2011 – REVISED MARCH 2013

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ELECTRICAL CHARACTERISTICS (continued)

Unless otherwise stated, the following conditions apply: VPVIN, AVIN = 5V. Limits in standard type are for TJ = 25°C only, limits

in bold face type apply over the junction temperature (TJ) range of −40°C to +125°C. Minimum and maximum limits are

specified through test, design, or statistical correlation. Typical values represent the most likely parametric norm at TJ = 25°C,

and are provided for reference purposes only.

Symbol

Parameter

Conditions

Min

Typ

Max

Units

SYSTEM

tRESETSS

DeviceReset to Soft-Start Ramp

50

110

200

µs

OSCILLATOR

fSYNCR

SYNC Frequency Range

300

1500

kHz

fDEFAULT

Default (no SYNC signal) Frequency

950

1000

1050

kHz

tSY_SW

Time from SYNC falling to VSW Rising

200

ns

tSY_MIN

Minimum SYNC pin pulse width, high or low

100

ns

tHSBLANK

HS OCP Blanking Time

Rising edge of SW to ICLR comparison

55

ns

tLSBLANK

LS OCP Blanking Time

Falling edge of SW to ICLF comparison

400

ns

tZXBLANK

Zero Cross Blanking Time

Falling edge of SW to VZX comparison

120

ns

tMINON

Minimum HS on-time

140

ns

ΔVramp

PWM Ramp p-p Voltage

0.8

V

ERROR AMPLIFIER

VOL

Error Amplifier Open Loop Voltage Gain

ICOMP = -65µA to 1mA

95

dBV/V

GBW

Error Amplifier Gain-Bandwidth Product

11

MHz

IFB

Feedback Pin Bias Current

VFB = 0.6V

1

nA

ICOMPSRC

COMP Output Source Current

1

mA

ICOMPSINK

COMP Output Sink Current

65

µA

POWERGOOD

VOVP

Over Voltage Protection Rising Threshold

VFB Rising

105

112.5

120

%VFB

VOVPHYS

Over Voltage Protection Hysteresis

VFB Falling

2

%VFB

VUVP

Under Voltage Protection Rising Threshold

VFB Rising

82

90

97

%VFB

VUVPHYS

Under Voltage Protection Hysteresis

VFB Falling

2.5

%VFB

tPGDGL

PGOOD Deglitch Low (OVP/UVP Condition

15

µs

Duration to PGOOD Falling)

tPGDGH

PGOOD Deglitch High (minimum low pulse)

12

µs

RPGOOD

PGOOD Pull-down Resistance

10

20

40

Ω

IPGOODLEAK

PGOOD Leakage Current

VPGOOD = 5V

1

nA

LOGIC

VIHSYNC

SYNC Pin Logic High

2.0

V

VILSYNC

SYNC Pin Logic Low

0.8

V

VIHENR

EN Pin Rising Threshold

VEN Rising

1.20

1.35

1.45

V

VENHYS

EN Pin Hysteresis

50

110

180

mV

IEN

EN Pin Pullup Current

VEN = 0V

2

µA

THERMAL SHUTDOWN

TTHERMSD

Thermal Shutdown

165

°C

TTHERMSDHYS Thermal Shutdown Hysteresis

10

°C

4

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