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LMS3655

SNAS744A – JULY 2017 – REVISED OCTOBER 2017

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(1)

For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application

report.

7.4 Thermal Information

LMS3655

UNIT

RNL (VQFN)

22 PINS

Junction-to-ambient thermal resistance

38.5

°C/W

Junction-to-case (top) thermal resistance

16.3

°C/W

Junction-to-board thermal resistance

16.4

°C/W

Junction-to-top characterization parameter

2.0

°C/W

Junction-to-board characterization parameter

16.4

°C/W

Junction-to-case (bottom) thermal resistance

4.6

°C/W

(1)

Mounted on a thermally optimized FR4 four layer EVM with a size of 4000 mill × 3000 mill.

7.5 Thermal Information (for Device Mounted on PCB)

LMS3655

UNIT

RNL (VQFN)

22 PINS

Junction-to-ambient thermal resistance

29.4

°C/W

Junction-to-case (top) thermal resistance

14.2

°C/W

Junction-to-board thermal resistance

5.4

°C/W

Junction-to-top characterization parameter

1.2

°C/W

Junction-to-board characterization parameter

5.4

°C/W

Junction-to-case (bottom) thermal resistance

2.4

°C/W

(1)

This is the current used by the device while not switching, open loop on the ATE. It does not represent the total input current from the

regulator system.

7.6 Electrical Characteristics

Limits apply over the recommended operating junction temperature range of –40°C to +150°C, unless otherwise noted.

Minimum and maximum limits are specified through test, design, or statistical correlation. Typical values represent the most

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Initial reference voltage for 5-V

and 3.3-V options

–1%

1%

–1.5%

1.5%

Operating quiescent current;

measured at VIN pin when

7.5

16

µA

Bias current into BIAS pin,

enabled, not switching

0 V

53

62

µA

= 0 V

53

62

Shutdown quiescent current;

measured at VIN pin

EN

≤ 0.4 V

2

3

µA

Minimum input voltage to operate

Rising

3.2

3.55

3.90

V

Falling

2.95

3.25

3.55

Hysteresis

0.28

0.3

0.4

RESET upper threshold voltage

105%

107%

110%

RESET lower threshold voltage

92%

94%

96.5%

Magnitude of RESET lower

threshold from steady state

output voltage

Steady-state output voltage and

RESET falling threshold read at the

96%