he series ua
TRANSCRIPT
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
HE2240 series 40V,IQ 1.4uA 250mA Low Power LDO
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
HE2240 series 40V,IQ 1.4uA 250mA Low Power LDO
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
HE2240 series 40V,IQ 1.4uA 250mA Low Power LDO
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)
HE2240 series 40V,IQ 1.4uA 250mA Low Power LDO
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
HE2240 series 40V,IQ 1.4uA 250mA Low Power LDO
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
HE2240 series 40V,IQ 1.4uA 250mA Low Power LDO
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
HE2240 series 40V,IQ 1.4uA 250mA Low Power LDO