he series ua

VIN VOUT

GND10uF

CIN

10uF

COUT

Features

Application

Description

The HE2240 ultra-low quiescent current regulator features low dropout voltage and low current in the standby mode. With less than 1.4μA quiescent current at no load, the HE2240 is deally suited for standby micro-control-unit systems, especially for always-on applications like E-meters, fire alarms, smoke detectors and other battery operated systems. The HE2240 retains all of the features that are common to low dropout regulators including a low dropout PMOS pass device, short circuit protection, and thermal shutdown. The HE2240 2 has a 40-V maximum operating voltage limit, a -40°C to 125°C operating temperature range, and ±2% output voltage tolerance over the entire output current, input voltage, and temperature range. The HE2240 is available in a SOT-23 -5L, SOT-23-3, surface mount pa ckages.

Application Circuits

VIN VOUT

HE2240 series 40V,IQ 1.4uA 250mA Low Power LDO

Ver1.5 1 Nov. 12,2020

VIN Range up to 40V Output Voltage Tolerances of ±2% Over the

Temperature Range Output Current of 250 mA Ultra Low Quiescent Current (IQ = 1.4 μA) Dropout Voltage Typically 1200 mV at IOUT =

250 mA

Internal Thermal Overload Protection

Internal Short-Circuit Current Limit Ceramic Capacitor Stable

E-meters, Water Meters and Gas Meters Fire Alarm, Smoke Detector Appliances and White Goods

HE2240

Product Selections

Type Output Voltage（note 1*）

Current Limit Accuracy

Package （note 2*）

MARKING (note 3*）

HE2240A25HMR 2.5V 250mA ±2% SOT23-33.3V 250mA ±2% SOT23-3 5.0V 250mA ±2% SOT23-32.5V 250mA ±2% SOT23-53.3V 250mA ±2% SOT23-5

250mA ±2% SOT23-5

AE=3CAE=2C

5.0V

AE=5CAF=2CAF=3CAF=5C

Pin Assignment

Table1: HE2240AXXHMR series (SOT23-3 PKG) PIN NO. PIN NAME FUNCTION

1 GND GND pin

2 VIN Input voltage pin

3 VOUT Output voltage pin

SOT23-3 (Top View)

Mark

1 3

2

Ver1.5 2 Nov. 12,2020

HE2240A33HMR

HE2240A50HMR

HE2240A25HM5RHE2240A33HM5R

HE2240A50HM5R


Mark

1 3

5

2

4 Table2: HE2240AXXHM5Rseries (SOT23-5 PKG) PIN NO. PIN NAME FUNCTION

1

GND GND pin 2

VIN Input voltage pin

3 EN EN

4 NC NC5 VOUT Output voltage pin

Absolute Maximum RatingsParameter Symbol Maximum Rating Unit

Input VoltageVIN VSS -0.3~VSS+40.0 V

VOUT VSS -0.3~VSS+5.0 VOutput Current IOUT 250 mA

Power DissipationSOT23-3

Pd400

mWSOT23-5 400

Thermal ResistanceSOT23-3 (3)

RθJA250 /W

SOT23-5 250 /WOperating Temperature Topr -40~85

Storage Temperature Tstg -40~125

Soldering Temperature & Time Tsolder 260, 10sNote (1): Exceeding these ratings may damage the device.

Note (2): The device is not guaranteed to function outside of its operating conditions

Note (3): The package thermal impedance is calculated in accordance to JESD

51-7.ESD Ratings

Item Description Value Unit

V(ESD-HBM)

Human Body Model (HBM) ANSI/ESDA/JEDEC JS-001-2014 Classification, Class: 2

±4000 V

V(ESD-CDM)

Charged Device Mode (CDM) ANSI/ESDA/JEDEC JS-002-2014 Classification, Class: C0b

±100 V

ILATCH-UPJEDEC STANDARD NO.78E APRIL 2016 Temperature Classification, Class: I ±250 mA

ESD testing is performed according to the respective JESD22 JEDEC standard.The human body model is a 100 pF capacitor

discharged through a 1.5kΩ resistor into each pin. The machine model is a 200pF capacitor discharged directly into each pin.

Recommended Operating ConditionsParameter MIN. MAX. Units

Supply voltage at VIN 40 VOperating junction temperature range, Tj -40 125 °C

Operating free air temperature range, TA -40 85 °CNote : All limits specified at room temperature (TA = 25°C) unless otherwise specified. All room temperature limits are 100% production

tested. All limits at temperature extremes are ensured through correlation using standard Statistical Quality Control (SQC) methods. All

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

(1) (2)

Ver1.5 3 Nov. 12,2020


Electrical Characteristics(Test Conditions:VIN= Vset+1V, VOUT=Vset,CIN=10uF, COUT=10uF,TA=25, unless otherwise specified.)

Parameter Symbol Conditions Min Typ Max UnitsInput Voltage VIN 45 V

Supply Current IQVIN=12V

ILOAD=0mA— 1.4 2.0 uA

Output Voltage HE2240 VOUT1

VIN=12VIOUT=10mA

Vset*0.98 Vset Vset*1.02 V

Maximum OutputCurrent IOUT(Max) — — 250 — mA

Dropout VoltageVDROP (1)

VOUT=3.3V

VIN= Vset-0.1VIOUT=10Ma

— 70 —mV

VIN= Vset-0.1VIOUT=100mA

— 700 —

Line RegulationΔVOUT/

ΔVIN•VOUT

IOUT=1mA(Vset+0.5v)≦VIN≦45V

— 0.01 — %/V

Load Regulation ΔVOUTVIN=12V

1mA≦IOUT≦100mA— 0.02 — %/ mA

Short Current ISHORT RL=1Ω — 100 — mAPower SupplyRejection Rate

PSRRVIN=12V VOUT=3.3Vf=1KHz,IOUT= 10mA

— 70 — dB

Output NoiseVoltage eNO

COUT=1uFBW = 300Hz~50kHz

— 50 — uVRMS

Output VoltageTemperatureCoefficient

ΔVOUT/ΔT•VOUT

IOUT=10mA — 100 — ppm/

Note：（1）Dropout Voltage is the voltage difference between the input and the output at which the outputvoltage drops 2% below its nominal value.

Ver1.5 4 Nov. 12,2020


Ver1.5 5 Nov. 12,2020

Typical Characteristics VIN=VOUT + 1V, IOUT=1mA, VOUT=3.3V, CIN=COUT=1uF, TJ=25, unless otherwise specified

Fig 1 Vout vs Vin Fig 2 Iq vs Vin

Fig 3 Vout vs Load Fig 4 Dropout vs Load

Fig 5 Vout Load Transient (0 to 50mA) Fig 6 Vout Load Transient (1 to 250mA)


Ver1.5 6 Nov. 12,2020

Fig 7 Vout Load Transient (50 to 250mA) Fig 8 Vout Short to GND

Fig 9 Vin Start up


Function Block Diagram

Application Guideline

Input Capacitor

A 10μF ceramic capacitor is recommended to connect between VDD and GND pins to decouple input

power supply glitch and noise. The amount of the capacitance may be increased without limit. This

input capacitor must be located as close as possible to the device to assure input stability and less

noise. For PCB layout, a wide copper trace is required for both VIN and GND.

Output Capacitor

An output capacitor is required for the stability of the LDO. The recommended output capacitance is

10μF, ceramic capacitor is recommended, and temperature characteristics are X7R or X5R. Higher

capacitance values help to improve load/line transient response. The output capacitance may be

increased to keep low undershoot/overshoot. Place output capacitor as close as possible to VOUT

and GND pins.

Dropout Voltage

The dropout voltage refers to the voltage difference between the VIN and VOUT pins while operating

at specific output current. The dropout voltage VDROP also can be expressed as the voltage drop on

the pass-FET at specific output current (IRATED) while the pass-FET is fully operating at ohmic

region and the pass-FET can be characterized asan resistance RDS(ON). Thus the dropout voltage

can bedefined as (VDROP = VIN − VOUT = RDS(ON) x IRATED). Fornormal operation, the

Ver1.5 7 Nov. 12,2020

Function Block Diagram


suggested LDO operating range is (VIN > VOUT + VDROP) for good transient response and PSRR

ability. Vice versa, while operating at the ohmic region will degrade the performance severely.

Thermal Application

For continuous operation, do not exceed the absolute maximum junction temperature. The maximum

power dissipation depends on the thermal resistance of the IC package, PCB layout, rate of

surrounding airflow, and difference between junction and ambient temperature. The maximum power

dissipation can be calculated as below: TA=25°C, PCB,

The max PD= (125°C − 25°C) / (Thermal Resistance °C/W)

Power dissipation (PD) is equal to the product of the output current and the voltage drop across the

output pass element, as shown in the equation below:

PD = (VIN – VOUT) × IOUT

Layout Consideration

By placing input and output capacitors on the same side of the PCB as the LDO, and placing them as

close as is practical to the package can achieve the best performance. The ground connections for

input and output capacitors must be back to the HE2240 ground pin using as wide and as short of a

copper trace as is practical.Connections using long trace lengths, narrow trace widths, and/or

connections through via must be avoided. These add parasitic inductances and resistance that

results in worse performance especially during transient conditions.

Ver1.5 8 Nov. 12,2020


Packaging InformationSOT23-3L

Ver1.5 9 Nov. 12,2020


Ver1.5 10 Nov. 12,2020

SOT23-5 Outline Dimensions


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