Datasheet > LMR38020_V01

LMR38020_V01

更新时间： 2022-10-12 16:27:39

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德州仪器 - TI		/
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描述
LMR38020 SIMPLE SWITCHERÂ® 4.2-V to 80-V, 2-A Synchronous Buck Converter with 40-Î¼A IQ

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LMR38020_V01 数据手册

LMR38020

www.ti.com

SNVSC40B – AUGUST 2021 – REVISED NOVEMBER 2021

7.5 System Characteristics

The following specifications apply to a typical application circuit with nominal component values. Specifications in the typical

(TYP) column apply to T_J= 25℃ only. Specifications in the minimum (MIN) and maximum (MAX) columns apply to the

case of typical components over the temperature range of T_J= –40℃ to 150℃. These specifications are not ensured by

production testing.

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

V_IN

Operating input voltage range

Adjustable output voltage regulation⁽¹⁾

4.2

V_OUT

PFM operation

–1.5%

2.5%

1.5%

FPWM operation

V_IN= 24 V, V_OUT= 3.3 V, I_OUT= 0 A,

R_FBT= 1 MΩ, PFM variant

I_SUPPLY

D_MAX

V_HC

Input supply current when in regulation

Maximum switch duty cycle⁽²⁾

97%

0.4

µA

FB pin voltage required to trip short-circuit

hiccup mode

t_D

Switch voltage dead time

163

150

°C

T_SD

Thermal shutdown temperature

Shutdown temperature

Recovery temperature

(1) Deviation in V_OUTfrom nominal output voltage value at V_IN= 24 V, I_OUT= 0 A to full load

(2) In dropout the switching frequency drops to increase the effective duty cycle. The lowest frequency is clamped at approximately: F_MIN

= 1 / (t_ON-MAX+ t_OFF-MIN). D_MAX= t_ON-MAX/(t_ON-MAX+ t_OFF-MIN).

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