TI1 LM2840XQMKX 100/300/600 ma 42v input step-down dc/dc regulator in thin sot-23 Datasheet

100/300/600 mA 42V Input Step-Down DC/DC Regulator in
Thin SOT-23
General Description
Features
The LM2840, LM2841 and LM2842 are PWM DC/DC buck
(step-down) regulators. With a wide input range from
4.5V-42V, they are suitable for a wide range of applications
such as power conditioning from unregulated sources. They
feature a low RDSON (0.9Ω typical) internal switch for maximum efficiency (85% typical). Operating frequency is fixed at
550 kHz (X version) and 1.25 MHz (Y version) allowing the
use of small external components while still being able to have
low output voltage ripple. Soft-start can be implemented using
the shutdown pin with an external RC circuit allowing the user
to tailor the soft-start time to a specific application.
The LM2840 is optimized for up to 100 mA, the LM2841 for
300 mA and the LM2842 is optimized for up to 600 mA load
currents. They all have a 0.765V nominal feedback voltage.
Additional features include: thermal shutdown, VIN under-voltage lockout, and gate drive under-voltage lockout. The
LM2840, LM2841 and LM2842 are available in a low profile
TSOT-6L package.
■ LM2840Q, LM2841Q and LM2842Q are Automotive
■
■
■
■
■
■
■
■
■
Grade products that are AEC-Q100 grade 1 qualified (-40°
C to +125°C operating junction temperature)
Input voltage range of 4.5V to 42V
Output current options of 100 mA, 300 mA and 600 mA
Feedback pin voltage of 0.765V
550 kHz (X) or 1.25 MHz (Y) switching frequency
Low shutdown IQ, 16 µA typical
Short circuit protected
Internally compensated
Soft-start circuitry
Small overall solution size (TSOT-6L package)
Applications
■
■
■
■
Battery powered equipment
Industrial distributed power applications
Portable media players
Portable hand held instruments
Typical Application Circuit
30036702
© 2012 Texas Instruments Incorporated
300367 SNVS540G
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LM2840/LM2841/LM2842/LM2840Q/LM2841Q/LM2842Q 100/300/600 mA 42V Input Step-Down
DC/DC Regulator in Thin SOT-23
March 26, 2012
LM2840/LM2841/LM2842/
LM2840Q/LM2841Q/
LM2842Q
LM2840/LM2841/LM2842/LM2840Q/LM2841Q/LM2842Q
Connection Diagram
Top View
30036704
TSOT 6 Lead
NS Package Number MK06A
Ordering Information
Order Number
Spec.
Package
Type
NSC
Package
Drawing
LM2840XMK-ADJL
SE8B
LM2840XMKX-ADJL
LM2840YMK-ADJL
SF1B
LM2840YMKX-ADJL
LM2841XMK-ADJL
STFB
LM2841XMKX-ADJL
LM2841YMK-ADJL
STTB
LM2841YMKX-ADJL
LM2842XMK-ADJL
STVB
LM2842XMKX-ADJL
LM2842YMK-ADJL
LM2842YMKX-ADJL
LM2840XQMK
LM2840XQMKX
LM2840YQMK
LM2840YQMKX
LM2841XQMK
LM2841XQMKX
LM2841YQMK
LM2841YQMKX
LM2842XQMK
LM2842XQMKX
LM2842YQMK
LM2842YQMKX
Top Mark
STXB
NOPB
TSOT-6
MK06A
SE9B
SF2B
SB1B
SB2B
SB3B
SB4B
Supplied As
Feature
1000 Units, Tape and Reel
3000 Units, Tape and Reel
1000 Units, Tape and Reel
3000 Units, Tape and Reel
1000 Units, Tape and Reel
3000 Units, Tape and Reel
1000 Units, Tape and Reel
3000 Units, Tape and Reel
1000 Units, Tape and Reel
3000 Units, Tape and Reel
1000 Units, Tape and Reel
3000 Units, Tape and Reel
1000 Units, Tape and Reel
3000 Units, Tape and Reel
1000 Units, Tape and Reel
3000 Units, Tape and Reel
1000 Units, Tape and Reel
3000 Units, Tape and Reel
1000 Units, Tape and Reel
3000 Units, Tape and Reel
AEC-Q100 Grade 1
qualified. Automotive
Grade Production
Flow*
1000 Units, Tape and Reel
3000 Units, Tape and Reel
1000 Units, Tape and Reel
3000 Units, Tape and Reel
*Automotive Grade (Q) product incorporates enhanced manufacturing and support processes for the automotive market, including defect detection methodologies.
Reliability qualification is compliant with the requirements and temperature grades defined in the AEC-Q100 standard. Automotive grade products are identified
with the letter Q. For more information go to http://www.national.com/automotive.
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2
Pin
Name
1
CB
2
GND
3
FB
4
SHDN
Function
SW FET gate bias voltage. Connect CBOOT cap between CB and SW.
Ground connection.
Feedback pin: Set feedback voltage divider ratio with VOUT = VFB (1+(R1/R2)). Resistors should
be in the 100-10K range to avoid input bias errors.
Logic level shutdown input. Pull to GND to disable the device and pull high to enable the device.
If this function is not used tie to VIN or leave open.
5
VIN
Power input voltage pin: 4.5V to 42V normal operating range.
6
SW
Power FET output: Connect to inductor, diode, and CBOOT cap.
3
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LM2840/LM2841/LM2842/LM2840Q/LM2841Q/LM2842Q
Pin Descriptions
LM2840/LM2841/LM2842/LM2840Q/LM2841Q/LM2842Q
Vapor Phase (60 sec.)
Infrared (15 sec.)
ESD Susceptibility
(Note 3)
Human Body Model
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the Texas Instruments Sales Office/
Distributors for availability and specifications.
VIN
SHDN
SW Voltage
CB Voltage above SW Voltage
FB Voltage
Maximum Junction
Temperature
Power Dissipation(Note 2)
Lead Temperature
-0.3V to +45V
-0.3V to (VIN+0.3V) <45V
-0.3V to +45V
7V
-0.3V to +5V
150°C
215°C
220°C
2 kV
Operating Conditions
Operating Junction
Temperature Range (Note 4)
Storage Temperature
Input Voltage VIN
SW Voltage
Internally Limited
300°C
−40°C to +125°C
−65°C to +150°C
4.5V to 42V
Up to 42V
Electrical Characteristics
Specifications in standard type face are for TJ = 25°C and those with boldface type apply over the full Operating Temperature
Range ( TJ = −40°C to +125°C). Minimum and Maximum limits are guaranteed through test, design, or statistical correlation. Typical
values represent the most likely parametric norm at TJ = +25°C, and are provided for reference purposes only. Unless otherwise
stated the following conditions apply: VIN = 12V.
Symbol
IQ
Min (Note 4) Typ (Note 5) Max (Note 4)
Units
16
40
µA
Device On, Not Switching
1.30
1.75
Device On, No Load
1.35
1.85
Parameter
Quiescent current
Conditions
SHDN = 0V
mA
RDSON
Switch ON resistance
(Note 6)
0.9
1.6
Ω
ILSW
Switch leakage current
VIN = 42V
0.0
0.5
µA
ICL
Switch current limit
LM2840 (Note 7)
525
900
mA
LM2841 (Note 7)
525
900
mA
LM2842 (Note 7)
1.15
1.7
A
IFB
Feedback pin bias current
VFB
FB Pin reference voltage
tON(min)
Minimum ON time
tOFF(min)
Minimum OFF time
fSW
LM2840/41/42 (Note 8)
0.1
1.0
µA
0.765
0.782
V
(Note 10)
100
150
ns
X option
110
370
ns
Y option
104
200
ns
550
750
0.747
LM2840/41/42X, VFB = 0.5V
Switching frequency
325
LM2840/41/42X, VFB = 0V
LM2840/41/42Y, VFB = 0.5V
140
0.95
LM2840/41/42Y, VFB = 0V
DMAX
VUVP
VSHDN
Maximum duty cycle
88
94
LM2840/41/42Y
81
87
Undervoltage lockout
thresholds
On threshold
4.4
3.7
Shutdown threshold
Device on
Off threshold
3.5
2.3
Shutdown pin input bias current VSHDN = 2.3V (Note 8)
VSHDN = 0V
1.50
0.35
LM2840/41/42X
Device off
ISHDN
1.25
kHz
MHz
%
3.25
1.0
0.9
0.3
0.05
1.5
0.02
1.5
V
V
µA
THERMAL SPECIFICATIONS
RθJA
Junction-to-Ambient Thermal (Note 9)
Resistance, TSOT-6L Package
121
°C/W
RθJC
Junction-to-Case Thermal
Resistance, TSOT-6L Package
94
°C/W
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4
Note 2: The maximum allowable power dissipation is a function of the maximum junction temperature, TJ(MAX), the junction-to-ambient thermal resistance,
θJA, and the ambient temperature, TA. The maximum allowable power dissipation at any ambient temperature is calculated using: 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. Thermal shutdown engages at TJ=175°C (typ.) and disengages at TJ= 155°C (typ).
Note 3: Human Body Model, applicable std. JESD22-A114-C.
Note 4: All limits guaranteed at room temperature (standard typeface) and at temperature extremes (bold typeface). All room temperature limits are 100%
production tested. All limits at temperature extremes are guaranteed via correlation using standard Statistical Quality Control (SQC) methods. All limits are used
to calculate Average Outgoing Quality Level (AOQL).
Note 5: Typical numbers are at 25°C and represent the most likely norm.
Note 6: Includes the bond wires, RDSON from VIN pin to SW pin.
Note 7: Current limit at 0% duty cycle. May be lower at higher duty cycle or input voltages below 6V.
Note 8: Bias currents flow into pin.
Note 9: All numbers apply for packages soldered directly onto a 3" x 3" PC board with 2 oz. copper on 4 layers in still air in accordance to JEDEC standards.
Thermal resistance varies greatly with layout, copper thickness, number of layers in PCB, power distribution, number of thermal vias, board size, ambient
temperature, and air flow.
Note 10: Minimum On Time guaranteed by design and simulation.
5
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LM2840/LM2841/LM2842/LM2840Q/LM2841Q/LM2842Q
Note 1: Absolute maximum ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions for which the device is intended
to be functional, but device parameter specifications may not be guaranteed. For guaranteed specifications and test conditions, see the Electrical Characteristics.
LM2840/LM2841/LM2842/LM2840Q/LM2841Q/LM2842Q
Typical Performance Characteristics
Efficiency vs. Load Current
(LM2842X, VOUT = 3.3V)
Efficiency vs. Load Current
(LM2841X, VOUT = 3.3V)
30036719
30036718
Efficiency vs. Load Current
(LM2840X, VOUT = 8V)
Switching Frequency vs. Temperature
(X version)
30036720
30036766
Input UVLO Voltage vs. Temperature
Switch Current Limit vs. SHDN Pin Voltage
(Soft-start Implementation, LM2840/41)
30036767
30036768
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6
LM2840/LM2841/LM2842/LM2840Q/LM2841Q/LM2842Q
Switch Current Limit vs. SHDN Pin Voltage
(Soft-start Implementation, LM2842)
SHDN Pin Current vs. SHDN Pin Voltage
30036769
30036721
Switching Node and Output Voltage Waveforms
Load Transient Waveforms
30036770
VIN = 12V, VOUT = 3.3V, IOUT = 200 mA
Top trace: VOUT, 10 mV/div, AC Coupled
Bottom trace: SW, 5V/div, DC Coupled
T = 1 µs/div
30036771
VIN = 12V, VOUT = 3.3V, IOUT = 300 mA to 200 mA to 300 mA
Top trace: VOUT, 20 mV/div, AC Coupled
Bottom trace: IOUT, 100 mA/div, DC Coupled
T = 200 µs/div
Start-up Waveform
30036772
VIN = 12V, VOUT = 3.3V, IOUT = 50 mA
Top trace: VOUT, 1V/div, DC Coupled
Bottom trace: SHDN, 2V/div, DC Coupled
T = 40 µs/div
7
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LM2840/LM2841/LM2842/LM2840Q/LM2841Q/LM2842Q
Block Diagram
30036703
is transferred to the load and output capacitor. The ratio of
these two cycles determines the output voltage. The output
voltage is defined approximately as: D=VOUT/VIN and D’ = (1D) where D is the duty cycle of the switch. D and D' will be
required for design calculations.
Operation
PROTECTION
The LM2840/1/2 has dedicated protection circuitry running
during normal operation to protect the IC. The thermal shutdown circuitry turns off the power device when the die temperature reaches excessive levels. The UVLO comparator
protects the power device during supply power startup and
shutdown to prevent operation at voltages less than the minimum input voltage. A gate drive (CB) under-voltage lockout
is included to guarantee that there is enough gate drive voltage to drive the MOSFET before the device tries to start
switching. The LM2840/1/2 also features a shutdown mode
decreasing the supply current to approximately 16 µA.
DESIGN PROCEDURE
This section presents guidelines for selecting external components.
SETTING THE OUTPUT VOLTAGE
The output voltage is set using the feedback pin and a resistor
divider connected to the output as shown on the front page
schematic. The feedback pin voltage 0.765V, so the ratio of
the feedback resistors sets the output voltage according to
the following equation: VOUT=0.765V(1+(R1/R2)) Typically
R2 will be given as 100Ω-10 kΩ for a starting value. To solve
for R1 given R2 and VOUT use R1=R2((VOUT/0.765V)-1).
CONTINUOUS CONDUCTION MODE
The LM2840/1/2 contains a current-mode, PWM buck regulator. A buck regulator steps the input voltage down to a lower
output voltage. In continuous conduction mode (when the inductor current never reaches zero at steady state), the buck
regulator operates in two cycles. The power switch is connected between VIN and SW. In the first cycle of operation the
transistor is closed and the diode is reverse biased. Energy
is collected in the inductor and the load current is supplied by
COUT and the rising current through the inductor. During the
second cycle the transistor is open and the diode is forward
biased due to the fact that the inductor current cannot instantaneously change direction. The energy stored in the inductor
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INPUT CAPACITOR
A low ESR ceramic capacitor (CIN) is needed between the
VIN pin and GND pin. This capacitor prevents large voltage
transients from appearing at the input. Use a 2.2 µF-10 µF
value with X5R or X7R dielectric. Depending on construction,
a ceramic capacitor’s value can decrease up to 50% of its
nominal value when rated voltage is applied. Consult with the
capacitor manufacturer's data sheet for information on capacitor derating over voltage and temperature.
8
DC switching regulator. The SHDN pin in conjunction with a
RC filter is used to tailor the soft-start for a specific application.
When a voltage applied to the SHDN pin is between 0V and
up to 2.3V it will cause the cycle by cycle current limit in the
power stage to be modulated for minimum current limit at 0V
up to the rated current limit at 2.3V. Thus controlling the output
rise time and inrush current at startup. The resistor value
should be selected so the current sourced into the SHDN pin
will be greater then the leakage current of the SHDN pin (1.5
µA ) when the voltage at SHDN is equal or greater then 2.3V.
A higher value of ripple current reduces inductance, but increases the conductance loss, core loss, and current stress
for the inductor and switch devices. It also requires a bigger
output capacitor for the same output voltage ripple requirement. A reasonable value is setting the ripple current to be
30% of the DC output current. Since the ripple current increases with the input voltage, the maximum input voltage is
always used to determine the inductance. The DC resistance
of the inductor is a key parameter for the efficiency. Lower DC
resistance is available with a bigger winding area. A good
tradeoff between the efficiency and the core size is letting the
inductor copper loss equal 2% of the output power. See
AN-1197 for more information on selecting inductors. A good
starting point for most applications is a 10 µH to 22 µH with
1.1A or greater current rating for the LM2842 or a 0.7A or
greater current rating for the LM2840/41. Using such a rating
will enable the LM2840/1/2 to current limit without saturating
the inductor. This is preferable to the LM2840/1/2 going into
thermal shutdown mode and the possibility of damaging the
inductor if the output is shorted to ground or other longterm
overload.
SHUTDOWN OPERATION
The SHDN pin of the LM2840/1/2 is designed so that it may
be controlled using 2.3V or higher logic signals. If the shutdown function is not to be used the SHDN pin may be tied to
VIN. The maximum voltage to the SHDN pin should not exceed 42V. If the use of a higher voltage is desired due to
system or other constraints it may be used, however a 100
kΩ or larger resistor is recommended between the applied
voltage and the SHDN pin to protect the device.
OUTPUT CAPACITOR
The selection of COUT is driven by the maximum allowable
output voltage ripple. The output ripple in the constant frequency, PWM mode is approximated by: VRIPPLE = IRIPPLE
(ESR+(1/(8fSWCOUT))) The ESR term usually plays the dominant role in determining the voltage ripple. Low ESR ceramic
capacitors are recommended. Capacitors in the range of 22
µF-100 µF are a good starting point with an ESR of 0.1Ω or
less.
LAYOUT CONSIDERATIONS
To reduce problems with conducted noise pick up, the ground
side of the feedback network should be connected directly to
the GND pin with its own connection. The feedback network,
resistors R1 and R2, should be kept close to the FB pin, and
away from the inductor to minimize coupling noise into the
feedback pin. The input bypass capacitor CIN must be placed
close to the VIN pin. This will reduce copper trace resistance
which effects input voltage ripple of the IC. The inductor L1
should be placed close to the SW pin to reduce EMI and capacitive coupling. The output capacitor, COUT should be
placed close to the junction of L1 and the diode D1. The L1,
D1, and COUT trace should be as short as possible to reduce
conducted and radiated noise and increase overall efficiency.
The ground connection for the diode, CIN, and COUT should
be as small as possible and tied to the system ground plane
in only one spot (preferably at the COUT ground point) to minimize conducted noise in the system ground plane. For more
detail on switching power supply layout considerations see
Application Note AN-1149: Layout Guidelines for Switching
Power Supplies.
SCHOTTKY DIODE
The breakdown voltage rating of the diode (D1) is preferred
to be 25% higher than the maximum input voltage. The current rating for the diode should be equal to the maximum
output current for best reliability in most applications. In cases
where the duty cycle is greater than 50%, the average diode
current is lower. In this case it is possible to use a diode with
a lower average current rating, approximately (1-D)IOUT, however the peak current rating should be higher than the maximum load current. A 0.5A to 1A rated diode is a good starting
point.
BOOTSTRAP CAPACITOR
A 0.15 µF ceramic capacitor or larger is recommended for the
bootstrap capacitor (CBOOT). For applications where the input
voltage is less than twice the output voltage a larger capacitor
is recommended, generally 0.15 µF to 1 µF to ensure plenty
of gate drive for the internal switches and a consistently low
RDSON.
SOFT-START COMPONENTS
The LM2840/1/2 has circuitry that is used in conjunction with
the SHDN pin to limit the inrush current on start-up of the DC/
9
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LM2840/LM2841/LM2842/LM2840Q/LM2841Q/LM2842Q
INDUCTOR SELECTION
The most critical parameters for the inductor are the inductance, peak current, and the DC resistance. The inductance
is related to the peak-to-peak inductor ripple current, the input
and the output voltages.
LM2840/LM2841/LM2842/LM2840Q/LM2841Q/LM2842Q
Application Information
30036705
FIGURE 1. Application Circuit, 3.3V Output @ 100 mA
Some Recommended Inductors (Others May Be Used)
Manufacturer
Inductor
Contact Information
Coilcraft
LPS4018, DO1608C, DO3308, and LPO2506 series
www.coilcraft.com
800-3222645
MuRata
LQH55D and LQH66S series
www.murata.com
Coiltronics
MP2 and MP2A series
www.cooperbussman.com
Some Recommended Input And Output Capacitors (Others May Be Used)
Manufacturer
Capacitor
Contact Information
Vishay Sprague
293D, 592D, and 595D series tantalum
www.vishay.com
407-324-4140
Taiyo Yuden
High capacitance MLCC ceramic
www.t-yuden.com
408-573-4150
Cornell Dubilier
ESRD seriec Polymer Aluminum Electrolytic
SPV and AFK series V-chip series
www.cde.com
MuRata
High capacitance MLCC ceramic
www.murata.com
30036708
FIGURE 2. Application Circuit, 5V Output
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LM2840/LM2841/LM2842/LM2840Q/LM2841Q/LM2842Q
30036709
FIGURE 3. Application Circuit, 12V Output
30036716
FIGURE 4. Application Circuit, 15V Output
30036717
FIGURE 5. Application Circuit, 0.8V Output
11
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LM2840/LM2841/LM2842/LM2840Q/LM2841Q/LM2842Q
Physical Dimensions inches (millimeters) unless otherwise noted
TSOT 6 Pin Package (MK)
For Ordering, Refer to Ordering Information Table
NS Package Number MK06A
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12
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13
LM2840/LM2841/LM2842/LM2840Q/LM2841Q/LM2842Q
Notes
LM2840/LM2841/LM2842/LM2840Q/LM2841Q/LM2842Q 100/300/600 mA 42V Input Step-Down
DC/DC Regulator in Thin SOT-23
Notes
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