ELM6M003SA 5V input 1.5A synchronous step-down DC/DC converter module
http://www.elm-tech.com■General description

ELM6M003SA is a complete 1.5A, synchronous step-down DC/DC convertor module with built-in switchingregulator, output capacitor and Inductor for small dimension application. ELM6M003SA uses constant-on-time(COT) control architecture which simplifies loop compensation and offers excellent load transient response.
ELM6M003SA consumes extremely low 15µA quiescent current hence achieves superior light load efficiency.
The high gain error amplifier in the control loop provides excellent load and line regulation. Proprietary adaptive
on-time helps ELM6M003SA to achieve nearly constant switching frequency across load range. ELM6M003SA
can operate with input voltage from 2.5V to 6V and provide output range from 0.6V to input level, thanks to100% duty cycle operation. ELM6M003SA has cycle-by-cycle current limit and hiccup mode to protect overload or short circuit fault conditions.
ELM6M003SA is available in compact and low profile 7 leads LGA 3mm × 3mm packages.

■Features• Cycle-by-cycle current limit protection• Over-load and short circuit hiccup mode
• Open drain power good indication• Output discharging function• Thermal shutdown protection• Built-in inductor and output capacitors• 1.5A continuous, 2A peak
: Typ.0.95ms• Internal soft-start: 2.5V to 6.0V
• Input range: 0.6V±2%• Minimum output voltage• Built-in power switches: Typ.100mΩ/80mΩ: Typ.2.5MHz• Switching Frequency• Low quiescent current: Typ.15μA: Typ.1.21V• Accurate enable threshold• Efficiency: More than 90%: 100%• Maximum duty cycle• Package: LGA7-3×3■Application• Solid-state and hard disk drives• USB-TypeC earphone• Smartphone and tablets• WiFi RF modules• DC/DC micro modules■Typical applications
Efficiency-Iout

100%
95%

Cin
C10μF
IN
10uF

EN

VIN

EN

DC/DC IC

VIN

PG
SW

PG

PGOOD

R1
VOUT
200k

R1200KENFBGNDFB R2100k
R2100K

Cff
47pF
CFF
47pF

VOUT
Cout
1.8V
10μF
COUT
10uF

90%

Efficiency(%)

VIN
2.5V~5.5V

85%80%
75%

5Vin3.3Vo
5Vin2.2Vo70%

5Vin1.8Vo
65%
0.001

0.01

0.1

Iout(A)
Io(A)110

Rev.1.0
1 / 11

ELM6M003SA 5V input 1.5A synchronous step-down DC/DC converter module
http://www.elm-tech.com■Recommended operating conditions
Parameter
Input voltage
Output voltage
Operating temperature range

SymbolVinVout
Top

Limit
+2.5 to +6.0
+0.6 to Vin-40 to +85* Note: The device is not guaranteed to function outside of the recommended operating conditions.

UnitVV°C■Maximum absolute ratings (*1)
Parameter

Input voltage
The other pins
Power dissipation at Ta=+25°C (* 2, 3)
Storage temperature range
Junction temperature range
Thermal resistance (* 2, 3)
Thermal resistance (* 2, 3)

SymbolVin
VotherPdTstg
Tjθjaθjc

Limit-0.3 to +6.5
-0.3 to +6.5
1.0-65 to +150
-40 to +150
12565

Unit
VVW°C°C°C/W°C/W* : 1. Stress exceeding those listed "Maximum absolute ratings" may damage the device.
2. Measured on JESD51-7, 4-Layer PCB.
3. The maximum allowable power dissipation is a function of the maximum junction temperature TJ_MAX, the junction toambient thermal resistance θja, and the ambient temperature Ta. The maximum allowable continuous power dissipation at any
ambient temperature is calculated by Pd_max= (Tj_max-Ta)/θja. Exceeding the maximum allowable power dissipation will cause
excessive die temperature, and the regulator will go into thermal shutdown. Internal thermal shutdown circuitry protects the device
from permanent damage.

■Selection Guide
ELM6M003SA-N
SymbolabcdPart No.
Package
Product version
Taping direction* Taping direction is one way.

ELM6M003
S: LGA7-3×3A
N: Please refer to page 11

ELM6M003 S A - N↑↑↑ ↑ab c dRev.1.02 / 11

ELM6M003SA 5V input 1.5A synchronous step-down DC/DC converter module
http://www.elm-tech.com■Pin configuration
Top view

Pin No.

Pin name1EN23, 4VIN
GND

5FB

6VOUT

7PG

Description
Regulator enable control input with accurate 1.21V enable
threshold which can be used to build precision R-C turn-on
delay and input under-voltage lockout. This pin has a typical
1MegΩ pull-down resistor to GND.
• Drive EN above 1.21V to turn on the converter• Drive EN below 1.11V to turn off the converter anddischarge output
Input supply voltage
GroundVoltage feedback input. Connect FB pin to the middle pointof a resistor divider between output and GND to program theoutput voltage.
Output pin that supplies current to the load.
Power good open-drain output. Connect a 100kΩ pull-up
resistor to Vin or Vout.

■Block diagram
Bandgap

FB++

0.6V
REFSS

VIN

Softstart

EA
REFSS++EN

PWM

Constant
On-time
VINModulationRamp

HSONONSW

VIN

SW

OVLD

M1
LControlLogic

OUT
C

LSONILIMT

M2

GND
PG+-+-Current
Limit&Over-loadDetection-Comp+0.54V

Rev.1.03 / 11

ELM6M003SA 5V input 1.5A synchronous step-down DC/DC converter module
http://www.elm-tech.com■Electrical characteristics

Top=+25°C, Vin=5V, Unless otherwise noted. Typical values are at Vin=Ven=5V and Vout=1.8V.
Parameter
SymbolTest conditions
Min. Typ. Max. Unit
Input voltage range
Vin
2.5
6.0V
Shutdown current
Is
Ven=0V, Vin=5.5V0.1
1.0μA
Input under voltage lockout threshold Vuvlo Vin Increasing
2.3
2.4
2.5
VInput under voltage lockout hysteresis Vhysu
280mV
Quiescent current
IqVfb or Vout above regulation
1520μA
Feedback regulation voltage
Vfbref Iout=1A
588
600612 mV
High side switch peak current limit
Ilim
2.6
3.3
5.0
A
PWM switching frequency
Fsw Vin=5V, Vout=3.3V, Iout=1A
2.27 2.50 3.14 MHz
PGOOD output low voltage
Vopg Vfb=0.5V, sink 1mA
0.20.3
VVfb or Vout above regulation
0.01 0.20 μA
PGOOD output leakage current
Ileak_pg
Vpgood=5.5V
Vfb ramp up from undervoltage,
PGOOD under voltage rise threshold
Vpg-13-10-7%% with respect to Vfbref
PGOOD hysteresis

Vpghys % with respect to Vfbref

5%

PGOOD delay
On-time for HS switch
EN Pin on threshold
EN Pin off threshold
EN internal pull down resistor
Output discharge resistanceSoft start time
Thermal shutdown
Thermal shutdown hysteresis

tdpg PGOOD low to high transitiont_sw Vin=5V, Vout=3.3V210Ven_on Ven ramp up
1.18
Ven_off Ven ramp down
1.05
Ren
RdscTss
From CE=L→H to 90% of Vout
TsdTsdhys

30μsnsVVkΩkΩ
ms°C°C

1.21
1.11
1000
1.4
0.95
160
30

290
1.24
1.17

■MarkingMarkContentM003
a to eProduct code
Lot No.

Rev.1.04 / 11

ELM6M003SA 5V input 1.5A synchronous step-down DC/DC converter module
http://www.elm-tech.com■Theory of operation

ELM6M003SA is a complete 1.5A, synchronous step-down DC/DC convertor module with built-in switchingregulator, output capacitor and Inductor for small dimension application. ELM6M003SA uses constant on-time(COT) control scheme which offers excellent transient response over a wide range of input voltage and achieves
superior light-load efficiency with extremely low quiescent current.
Constant On-time control
Constant on-time control step-down DC/DC converters turn on HS immediately when FB droops below reference. The HS is turned on for a pre-determined period (on-time) of time to ramp up the inductor current, andthen the LS will be turned on to ramp down the inductor current. The cycle repeats itself if FB droops below reference again. ELM6M003SA uses proprietary adaptive on-time control technique to take into account the load
current impact and adjusts the on-time accordingly to achieve a constant switching frequency over entire load
current range.
For ELM6M003SA, the on-time is approximately:
VoutTon =• 0.4μsVin
Due to its immediate response on FB voltage droop and simplified loop compensation, constant on-time offers asuperior transient response compare to traditional fixed frequency PWM control step-down converters.
Light load operation
In light load condition where the converter operates in discontinuous mode, ELM6M003SA cuts down its quiescent current to as low as 15uA and achieves excellent light load efficiency.
EnableWhen input voltage is above the under voltage lock-out threshold, ELM6M003SA can be enabled by pulling
the EN pin to above 1.21V. ELM6M003SA is disabled if the EN pin is pulled below 1.11V. The enable/disable
threshold for EN pin is accurately designed to be 1.21V and 1.11V respectively, so one can also use external resistor divider to program the desired input under-voltage lockout level.
Soft start
ELM6M003SA has built-in 0.95msec soft start to limit input inrush current. During the soft start period, output
voltage is ramped up linearly to the regulation voltage, independent of the load current level and output capacitor value.
Current limit and hiccup mode
ELM6M003SA has cycle-by-cycle HS current limit protection to prevent inductor current from running away.
Once HS current limit is triggered, ELM6M003SA will turn on LS and wait for the inductor to drop down to apre-determined level before the HS can be turned on again. If this current limit condition is repeated for a sustained long period of time, ELM6M003SA will consider it over-load or short circuit. Either way, ELM6M003SA
will enter hiccup mode, where it stop switching for a pre-determined period of time before automatically re-try
to start up again. It always starts up with soft-start to limit inrush current and avoid output overshoot.
Power good indication
ELM6M003SA has open drain Power Good indicator PG pin. When PG is connected with an external pull upresistor, it is pulled up if output voltage is higher than 90% of regulation, otherwise PG is pulled down by theinternal open drain NMOS.
Rev.1.0
5 / 11

ELM6M003SA 5V input 1.5A synchronous step-down DC/DC converter module
http://www.elm-tech.com■Application information
Setting the output voltage

External feedback resistors are used to set the output voltage. Refer to typical application circuit on page1.
Choose the top feedback resistor R1 in the range between 100kΩ~200kΩ to achieve high efficiency at light load
while providing acceptable noise sensitivity. For any chosen R1, the bottom feedback resistor R2 can be calculated as:
R1
R2 =Vout-1
0.6
PCB Layout recommendation
The physical design of the PCB is the final stage in the design of power converter. If designed improperly, thePCB could radiate excessive EMI and contribute instability to the power converter. Therefore, following thePCB layout guidelines below can ensure better performance of ELM6M003SA.
(1). The loop (Vin-Vout-Cout-GND) indicates a high current path. The traces within the loop should be kept as
wide and short as possible to reduce parasitic inductance and high-frequency loop area. It is also good forefficiency improvement.
(2). Input capacitor shall be placed as close as possible to the IC Pins (Vin and GND) and the input loop area
should be as small as possible to reduce parasitic inductance, input voltage spike and noise emission.
(3). Feedback components (R1, R2 and Cff) should be routed as short as possible to minimize noise issue.

■Application schematicENRen100k

Vin
2.5V to 6.0V

PGOOD
PG 71 ENCen

VOUT 60.1μF

2 VIN
Cin
10μF

3DC/DC ICRpg

R1200kFB 5GND

Vout
1.8V

100k

Cff
47pF

Cout
10μF

R2100kGND
4Rev.1.0
6 / 11

ELM6M003SA 5V input 1.5A synchronous step-down DC/DC converter module
http://www.elm-tech.com

EVB BOM List
Qty
1Ref
Cin

Value
10µF

Description
Ceramic capacitor, 10V, X5R

Package0805

12Cout
Cen

10µF
0.1µF

Ceramic capacitor, 10V, X5R
Ceramic capacitor, 10V, X5R

0805
06031Cff

47pF

Ceramic capacitor, 10V, X5R

0603

Resistor, ±1%0603

Resistor, ±1%0603

1121R1R2Rpg, Ren
Power IC

Vout=3.3V

200KΩ

Vout=2.5V
Vout=1.8V

240KΩ
200KΩ

Vout=1.2V
Vout=1.0V
Vout=3.3V

200KΩ
100KΩ
43KΩ

Vout=2.5V
Vout=1.8V

75KΩ
100KΩ

Vout=1.2V
200KΩ
Vout=1.0V
150KΩ
100KΩ
ELM6M003SA

Resistor, ±1%
Step-down DC/DC converter module

0603
LGA7-3x3

0.900

2.000

1.800

0.800

0.400

0.550

1.000

0.400

■Reference land pattern

3.600

Rev.1.0
7 / 11ELM6M003SA 5V input 1.5A synchronous step-down DC/DC converter module
http://www.elm-tech.com■Typical characteristic curves• Unless otherwise noted, Cin=10μF, Cout=10μF(External), Top=25°C

0Thermal derating curve95%

LGA7-3x3

25

50

75

100

125

150

75%

5Vin3.3Vo
5Vin2.2Vo

Vout-Iout

5.0
Oscillation frequency (MHz)

2.5
2.0

1.5
1.0
0.5
0.5

1.0

1.5

0.01

0.1

110Iout (A)3.0
Vout (V)

80%

65%
0.001

3.5

2.0

Oscillation frequency-Iout

4.0

3.0

2.0
1.0

0

0.5

1.01.52.0Iout (A)Iout (A)Load transient response

Load transient response

Vin=5.0V, Vout=3.3V, Iout=0.1A → 0.5A

Vin=5.0V, Vout=3.3V, Iout=0.5A → 1.0A

�∆

Vout (AC)50mV/Div

∆

�

Iout
0.5A/Div

∆

∆

Iout
0.5A/Div85%

5Vin1.8Vo

4.0Vout (AC)50mV/Div

90%

70%

Ambient temperature Top(°C)

0Efficiency-Iout

100%

Efficiency (%)

Power dissipation Pd(mW)

1100
1000
900
800
700
600
500
400
300
200100��Time (400us/Div)Time (400us/Div)

Rev.1.08 / 11

ELM6M003SA 5V input 1.5A synchronous step-down DC/DC converter module
http://www.elm-tech.com• Unless otherwise noted, Cin=10μF, Cout=10μF(External), Top=25°C
Load transient response

Soft start response

Vin=5.0V, Vout=3.3V, Iout=0.5A → 1.5A

Vout
1.0V/Div∆

Vout (AC)50mV/Div��

Ven
1.0V/Div�∆Iout
0.5A/Div�Time (400us/Div)Time (500us/Div)

Output discharge response

Vout
1.0V/Div�Ven�
1.0V/DivTime (500us/Div)

Rev.1.0
9 / 11

ELM6M003SA 5V input 1.5A synchronous step-down DC/DC converter module
http://www.elm-tech.com■LGA7-3×3 Outline dimensions• Unit: inches/mm

1Symbols
Atbb1cDEfL
L1Millimeters
Min.
Max.
1.35
1.45
0.30 TYP
0.25
0.35
0.40
0.50
1.50 BSC
2.90
3.10
2.90
3.10
0.80 BSC
0.45
0.55
0.55
0.65

Inches
Min.
Max.
0.053
0.057
0.012 TYP
0.010
0.014
0.016
0.02
0.059 BSC
0.114
0.122
0.114
0.122
0.031 BSC
0.018
0.022
0.022
0.026

Rev.1.010 / 11

ELM6M003SA 5V input 1.5A synchronous step-down DC/DC converter module

Tape & Reel Carrier Dimensions
Tape & Reel Carrier Dimensions& Reel tapeCarrier
Dimensions■ReelTapecarrier
dimension
1.&Orientation/ Carrier
Tape Information:

http://www.elm-tech.com

1. Orientation / Carrier Tape Information:
1. Orientation / Carrier Tape Information:• Orientation / Carrier tape information

B

A

B
B

A
A

Pin 1
Pin 1
Pin 1CCC

D
D
D
Feeding direction
Feeding direction
Feeding direction

2.

Reel Information:

2.

Reel Information:

Reel Information:• Reel2.information• Dimension
details Details:
3. Dimension
3. Dimension Details:
3. Dimension Details:
PKG TypeABCDEF

Q'ty/Reel

PKG Type
LGA3x3_7L
PKG Type

A
4.0AmmB
1.5Bmm

C12.0C mm

D8.0DmmE
13 inchesEF
13.0F mmQ'ty/Reel
3,000
Q'ty/Reel

LGA3x3_7L
LGA3x3_7L

4.0 mm
4.0 mm

1.5 mm
1.5 mm

12.0 mm12.0 mm

8.0 mm
8.0 mm13 inches
13 inches

13.0 mm13.0 mm

3,000
3,000

Rev.1.0
11 / 11