TI1 LMR62014 Simple switcherâ® 42vin, 0.6a step-down voltage regulator in sot-23 Datasheet

LMR62014,LMR64010
Application Note 2183 LMR62014/LMR64010 Demo Board
Literature Number: SNVA500
National Semiconductor
Application Note 2183
Marc Davis-Marsh
September 22, 2011
Introduction
Shutdown Operation
The LMR62014 and LMR64010 are high frequency switching
boost regulators which offer small size and high power conversion efficiency. The parts operate at a 1.6MHz switching
frequency. The primary difference between the LMR62014
and LMR64010 is that the LMR62014 has a higher current
internal switch FET (with lower breakdown voltage), while the
LMR64010 has a higher voltage FET which handles less current. The LMR64010 targets applications with higher output
voltages, while the LMR62014 is intended for applications requiring higher load currents at lower output voltages. This
application note describes the demo board supplied to
demonstrate the operation of these parts and give information
on its usage.
The demo board includes a pull-up resistor R3 to enable the
device once VIN has exceeded 1.5V. Use the EN post to disable the device by pulling this node to GND. A logic signal
may be applied to the post to test startup and shutdown of the
device.
Features
Feedforward Compensation
•
•
The feedforward capacitor CF should be selected to set the
compensation zero at approximately 8 kHz. The value of CF
is calculated using:
•
•
•
•
2.7V to 12V Input Voltage Range
12V Output Voltage, and 450mA Output Current from 5V
input supply (LMR62014)
24V Output Voltage, and 125mA Output Current from 5V
input supply (LMR64010)
Switching Frequency of 1.6 MHz
Minimal Component Count
Small Solution Size (12mm x 17mm)
Adjusting the Output Voltage
The output voltage can be changed from 12V/24V to another
voltage by adjusting the feedback resistors using the following
equation:
VOUT = VFB(1+(R1/R2))
Where VFB is 1.23V.
LMR62014/LMR64010 Demo Board
LMR62014/LMR64010 Demo
Board
CF = 1 / (2 x π x 8k x R1)
The value of CF is calculated after R1 is selected for the output voltage needed for the specific application.
For more information on component selection and features
see the LMR62014/LMR64010 datasheet.
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Bottom View
Top View
FIGURE 1. LMR62014/LMR64010 Demo Board
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FIGURE 2. LMR62014 Demo Board Schematic
Bill of Materials (BOM) LMR62014
ID
Part Number
Type
Size
U1
LMR62014XMF-ADJ
Boost Regulator
SOT-23
L1
NR6045T100M
Inductor
SMD
D1
CRS08
Diode
C1
GRM21BR71C225KA12L
C2
Parameters
Qty
Vendor
1
NSC
10uH, 2.5A, 0.061
ohm,
1
Sumida
S-Flat
Schottky, 30V,
1.5A
1
Toshiba
Capacitor
0805
Ceramic, 2.2uF,
16V, X7R
1
Murata
GRM32ER71H475KA88L
Capacitor
1210
Ceramic, 4.7uF,
50V, X7R
1
Murata
CF
C0603C221J5GACTU
Capacitor
0603
Ceramic, 220pF,
50V, C0G/NP0
1
Kemet
CHF
GRM188R71H223KA01D
Capacitor
0603
Ceramic,
0.022uF, 50V,
X7R
1
Murata
R1
CRCW0603115KFKEA
Resistor
0603
115 kΩ
1
Vishay
R2
CRCW060313K3FKEA
Resistor
0603
13.3 kΩ
1
Vishay
0603
R3
CRCW06031M00JNEA
Resistor
1.0 MegΩ
1
Vishay
EN
5014
Test Point Loop
Yellow
1
Keystone
VIN
5010
Test Point Loop
Red
1
Keystone
VOUT
5013
Test Point Loop
Orange
1
Keystone
GND
5011
Test Point Loop
Black
2
Keystone
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FIGURE 3. LMR64010 Demo Board Schematic
Bill of Materials (BOM) LMR64010
ID
Part Number
Type
Size
U1
LMR64010XMF-ADJ
Boost Regulator
SOT-23
L1
NR6045T100M
Inductor
SMD
D1
CRS04
Diode
C1
GRM21BR71C225KA12L
C2
Parameters
Qty
Vendor
1
NSC
10uH, 2.5A, 0.061
ohm,
1
Sumida
S-Flat
Schottky, 40V,
1.0A
1
Toshiba
Capacitor
0805
Ceramic, 2.2uF,
16V, X7R
1
Murata
GRM32ER71H475KA88L
Capacitor
1210
Ceramic, 4.7uF,
50V, X7R
1
Murata
CF
C0603C121J5GACTU
Capacitor
0603
Ceramic, 120pF,
50V, C0G/NP0
1
Kemet
CHF
GRM188R71H223KA01D
Capacitor
0603
Ceramic,
0.022uF, 50V,
X7R
1
Murata
R1
CRCW0603243KFKEA
Resistor
0603
243 kΩ
1
Vishay
R2
CRCW060313K3FKEA
Resistor
0603
13.3 kΩ
1
Vishay
0603
R3
CRCW06031M00JNEA
Resistor
1.0 MegΩ
1
Vishay
EN
5014
Test Point Loop
Yellow
1
Keystone
VIN
5010
Test Point Loop
Red
1
Keystone
VOUT
5013
Test Point Loop
Orange
1
Keystone
GND
5011
Test Point Loop
Black
2
Keystone
3
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Test Setup
Step
Demonstration Board Quick Setup Procedures LMR62014
1
Connect a power supply to VIN terminals
Notes
2
Connect a load to VOUT terminals
3
EN terminal should be left floating for normal operation. Short this to ground
to shutdown the part
4
Set VIN = 5V, with 0A load applied, check VOUT with a voltmeter
Nominal 11.9V
5
Apply a 450mA load and check VOUT
Nominal 11.9V
Step
Demonstration Board Quick Setup Procedures LMR64010
Notes
1
Connect a power supply to VIN terminals
2
Connect a load to VOUT terminals
3
EN terminal should be left floating for normal operation. Short this to ground
to shutdown the part
4
Set VIN = 5V, with 0A load applied, check VOUT with a voltmeter
Nominal 23.7V
5
Apply a 125mA load and check VOUT
Nominal 23.5V
Efficiency Measurements
Edge Connector Schematic
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Voltage Ripple Measurements
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Typical Performance Characteristics
Efficiency vs. Load Current LMR62014, VOUT = 12V
Efficiency vs. Load Current LMR62014, VOUT = 12V
85
95
80
75
85
EFFICIENCY (%)
EFFICIENCY (%)
90
80
75
70
0.0
65
60
55
50
65
60
70
45
VIN =5.0V
40
0.1
0.2
0.3
0.4
LOAD CURRENT (A)
0.5
0.00
VIN =3.3V
0.05
0.10
LOAD CURRENT (A)
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Efficiency vs. Load Current LMR64010, VOUT = 24V
95
95
90
90
85
85
EFFICIENCY (%)
EFFICIENCY (%)
Efficiency vs. Load Current LMR64010, VOUT = 24V
80
75
70
65
60
80
75
70
65
VIN =12.0V
60
0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35
LOAD CURRENT (A)
0.000
VIN = 5.0V
0.025 0.050 0.075 0.100
LOAD CURRENT (A)
0.125
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Load Transient Waveforms LMR62014
IOUT = 33 to 330mA
Load Transient Waveforms LMR64010
IOUT = 13 to 125mA
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Switching Node and Output Voltage Waveforms
LMR62014
Switching Node and Output Voltage Waveforms
LMR64010
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Startup Waveform
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Layout
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Top Layer
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Top Overlay
7
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Bottom Layer
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Bottom Overlay
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LMR62014/LMR64010 Demo Board
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