LM2841YMK-ADJEV/NOPB National Semiconductor, LM2841YMK-ADJEV/NOPB Datasheet

EVAL BOARD FOR LM2841YMK-ADJ

LM2841YMK-ADJEV/NOPB

Manufacturer Part Number
LM2841YMK-ADJEV/NOPB
Description
EVAL BOARD FOR LM2841YMK-ADJ
Manufacturer
National Semiconductor

Specifications of LM2841YMK-ADJEV/NOPB

Silicon Manufacturer
National
Silicon Core Number
LM2841
Kit Application Type
Power Management - Voltage Regulator
Application Sub Type
Buck Regulator
Kit Contents
Board, Doc
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
© 2010 National Semiconductor Corporation
300 mA up to 42V Input Step-Down DC/DC Regulator in
Thin SOT-23
General Description
The 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 con-
ditioning from unregulated sources. They feature a low
R
(85% typical). Operating frequency is fixed at 550 kHz (X ver-
sion) 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 shut-
down pin with an external RC circuit allowing the user to tailor
the soft-start time to a specific application.
The LM2842 is optimized for up to 600 mA load currents while
the LM2841 is optimized for up to 300 mA load current. Both
have a 0.765V nominal feedback voltage.
Additional features include: thermal shutdown, V
age lockout, and gate drive under-voltage lockout. The
LM2841 and LM2842 are available in a low profile TSOT-6L
package.
Typical Application Circuit
DSON
(0.9Ω typical) internal switch for maximum efficiency
300367
IN
under-volt-
LM2841
LM2842
Features
Applications
Input voltage range of 4.5V to 42V
Output current options of 300 mA and 600 mA
Feedback pin voltage of 0.765V
550 kHz (X) or 1.25 Mhz (Y) switching frequency
Low shutdown I
Short circuit protected
Internally compensated
Soft-start circuitry
Small overall solution size (TSOT-6L package)
Battery powered equipment
Industrial distributed power applications
Portable media players
Portable hand held instruments
Q
, 16 µA typical
30036702
March 24, 2010
www.national.com

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LM2841YMK-ADJEV/NOPB Summary of contents

Page 1

... Additional features include: thermal shutdown, V age lockout, and gate drive under-voltage lockout. The LM2841 and LM2842 are available in a low profile TSOT-6L package. Typical Application Circuit © 2010 National Semiconductor Corporation LM2841 LM2842 Features ■ Input voltage range of 4.5V to 42V ■ ...

Page 2

... Connection Diagram Ordering Information Order Number Spec. LM2841XMK-ADJL LM2841XMKX-ADJL LM2841YMK-ADJL LM2841YMKX-ADJL NOPB LM2842XMK-ADJL LM2842XMKX-ADJL LM2842YMK-ADJL LM2842YMKX-ADJL Pin Descriptions Pin Name GND SHDN www.national.com Top View 30036704 TSOT 6 Lead NS Package Number MK06A NSC Package Package Top Mark Type Drawing STFB STTB TSOT-6 ...

Page 3

Block Diagram 3 30036703 www.national.com ...

Page 4

... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications SHDN SW Voltage CB Voltage above SW Voltage FB Voltage Maximum Junction Temperature Power Dissipation(Note 2) Electrical Characteristics Specifications in standard type face are for T Range ( T = −40°C to +125°C). Minimum and Maximum limits are guaranteed through test, design, or statistical correlation. Typical ...

Page 5

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 ...

Page 6

Typical Performance Characteristics Efficiency vs. Load Current (LM2842X, V OUT Efficiency vs. Load Current (LM2841X, V OUT Input UVLO Voltage vs. Temperature www.national.com = 3.3V) 30036718 Switching Frequency vs. Temperature = 8V) 30036720 Switch Current Limit vs. SHDN Pin Voltage ...

Page 7

Switch Current Limit vs. SHDN Pin Voltage (Soft-start Implementation, LM2842) Switching Node and Output Voltage Waveforms V = 12V 3.3V 200 mA IN OUT OUT Top trace mV/div, AC Coupled OUT Bottom trace: ...

Page 8

Operation PROTECTION The LM2841/42 has dedicated protection circuitry running during normal operation to protect the IC. The thermal shut- down circuitry turns off the power device when the die tem- perature reaches excessive levels. The UVLO comparator protects the power ...

Page 9

In cases where the input voltage is much greater than the output volt- age the average diode current is lower. In ...

Page 10

Application Information Some Recommended Inductors (Others May Be Used) Manufacturer Coilcraft MuRata Coiltronics Some Recommended Input And Output Capacitors (Others May Be Used) Manufacturer Vishay Sprague Taiyo Yuden Cornell Dubilier MuRata www.national.com FIGURE 1. Application Circuit, 3.3V Output Inductor LPS4018, ...

Page 11

FIGURE 3. Application Circuit, 12V Output FIGURE 4. Application Circuit, 15V Output FIGURE 5. Application Circuit, 0.8V Output 11 30036709 30036716 30036717 www.national.com ...

Page 12

Physical Dimensions www.national.com inches (millimeters) unless otherwise noted TSOT 6 Pin Package (MK) For Ordering, Refer to Ordering Information Table NS Package Number MK06A 12 ...

Page 13

Notes 13 www.national.com ...

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... For more National Semiconductor product information and proven design tools, visit the following Web sites at: www.national.com Products Amplifiers www.national.com/amplifiers Audio www.national.com/audio Clock and Timing www.national.com/timing Data Converters www.national.com/adc Interface www.national.com/interface LVDS www.national.com/lvds Power Management www.national.com/power Switching Regulators www.national.com/switchers LDOs www.national.com/ldo LED Lighting www ...

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