LM3421 datasheet(5/65 Pages) TI1

5 / 65 page

LM3421, LM3421-Q1

LM3423, LM3423-Q1

www.ti.com

SNVS574D – JULY 2008 – REVISED SEPTEMBER 2011

Electrical Characteristics

(1)

Specifications in standard type face are for TJ = 25°C and those with boldface type apply over the full Operating

Temperature Range ( TJ = −40°C to +150°C for LM3421Q0/LM3423Q0, TJ = −40°C to +125°C for all others). Specifications

that differ between the two operating ranges will be identified in the Temp Range column as Q0 for TJ = −40°C to +150°C

and as Q1 for TJ = −40°C to +125°C. If no temperature range is indicated then the specification holds for both Q1 and Q0.

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. Unless otherwise stated the following

condition applies: VIN = +14V.

Temp

Symbol

Parameter

Conditions

Min(2)

Typ(3)

Max(2)

Units

Range

STARTUP REGULATOR

VCCREG

VCC Regulation

ICC = 0 mA

6.30

6.90

7.35

ICCLIM

VCC Current Limit

VCC = 0V

Quiescent Current

EN = 3.0V, Static

3.5

ISD

Shutdown Current

EN = 0V

0.1

1.0

µA

VCC SUPPLY

VCCUV

VCC UVLO Threshold

VCC Increasing

4.17

4.50

VCC Decreasing

3.70

4.08

VCCHYS

VCC UVLO Hysteresis

0.1

EN THRESHOLDS

ENST

EN Startup Threshold

EN Increasing

2.40

1.75

2.75

EN Decreasing

0.80

1.63

ENSTHYS

EN Startup Hysteresis

0.1

REN

EN Pulldown Resistance

EN = 1V

1.30

0.45

0.82

Ω

1.80

CSH THRESHOLDS

CSH High Fault

CSH Increasing

1.6

CSH Low Condition on LRDY

CSH increasing

1.0

Pin (LM3423)

OV THRESHOLDS

OVPCB

OVP OVLO Threshold

OVP Increasing

1.185

1.240

1.285

OVPHYS

OVP Hysteresis Source

OVP Active (high)

µA

Current

DPOL THRESHOLDS

DPOLTHRES

DPOL Logic Threshold

DPOL Increasing

2.0

2.3

2.6

RDPOL

DPOL Pullup Resistance

500

1200

Ω

FAULT TIMER

VFLTTH

Fault Threshold

1.285

1.185

1.240

1.290

IFLT

Fault Pin Source Current

13.0

10.0

11.5

µA

13.5

(1)

Absolute Maximum Ratings indicate limits beyond which damage to the device may occur, including inoperability and degradation of

device reliability and/or performance. Functional operation of the device and/or non-degradation at the Absolute Maximum Ratings or

other conditions beyond those indicated in the Operating Ratings is not implied. The recommended Operating Ratings indicate

conditions at which the device is functional and the device should not be operated beyond such conditions. All voltages are with respect

to the potential at the AGND pin, unless otherwise specified.

(2)

All limits specified at room temperature (standard typeface) and at temperature extremes (bold typeface). All room temperature limits are

100% production tested. All limits at temperature extremes are specified via correlation using standard Statistical Quality Control (SQC)

methods. All limits are used to calculate Average Outgoing Quality Level (AOQL).

(3)

Typical numbers are at 25°C and represent the most likely norm.

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