LM2736X EVAL National Semiconductor, LM2736X EVAL Datasheet

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LM2736X EVAL

Manufacturer Part Number
LM2736X EVAL
Description
BOARD EVALUATION LM2736X
Manufacturer
National Semiconductor
Datasheets
1.LM2736YMKNOPB.pdf (22 pages)
2.LM2736X_EVAL.pdf (9 pages)

Specifications of LM2736X EVAL

Main Purpose
DC/DC, Step Down
Outputs And Type
1, Non-Isolated
Voltage - Output
1.5V
Current - Output
750mA
Voltage - Input
3 ~ 18V
Regulator Topology
Buck
Frequency - Switching
1.6MHz
Board Type
Fully Populated
Utilized Ic / Part
LM2736
Lead Free Status / RoHS Status
Not applicable / Not applicable
Power - Output
-
© 2005 National Semiconductor Corporation
LM2736
Thin SOT23 750mA Load Step-Down DC-DC Regulator
General Description
The LM2736 regulator is a monolithic, high frequency, PWM
step-down DC/DC converter in a 6-pin Thin SOT23 package.
It provides all the active functions to provide local DC/DC
conversion with fast transient response and accurate regu-
lation in the smallest possible PCB area.
With a minimum of external components and online design
support through WEBENCH
The ability to drive 750mA loads with an internal 350mΩ
NMOS switch using state-of-the-art 0.5µm BiCMOS technol-
ogy results in the best power density available. The world
class control circuitry allows for on-times as low as 13ns,
thus supporting exceptionally high frequency conversion
over the entire 3V to 18V input operating range down to the
minimum output voltage of 1.25V. Switching frequency is
internally set to 550kHz (LM2736Y) or 1.6MHz (LM2736X),
allowing the use of extremely small surface mount inductors
and chip capacitors. Even though the operating frequencies
are very high, efficiencies up to 90% are easy to achieve.
External shutdown is included, featuring an ultra-low
stand-by current of 30nA. The LM2736 utilizes current-mode
control and internal compensation to provide high-
performance regulation over a wide range of operating con-
ditions. Additional features include internal soft-start circuitry
to reduce inrush current, pulse-by-pulse current limit, ther-
mal shutdown, and output over-voltage protection.
Typical Application Circuit
WEBENCH
™
is a trademark of Transim.
®
™
, the LM2736 is easy to use.
DS201242
20124201
Features
n Thin SOT23-6 package
n 3.0V to 18V input voltage range
n 1.25V to 16V output voltage range
n 750mA output current
n 550kHz (LM2736Y) and 1.6MHz (LM2736X)
n 350mΩ NMOS switch
n 30nA shutdown current
n 1.25V, 2% internal voltage reference
n Internal soft-start
n Current-Mode, PWM operation
n WEBENCH
n Thermal shutdown
Applications
n Local Point of Load Regulation
n Core Power in HDDs
n Set-Top Boxes
n Battery Powered Devices
n USB Powered Devices
n DSL Modems
n Notebook Computers
switching frequencies
Efficiency vs Load Current "X"
®
online design tool
V
IN
= 5V, V
OUT
= 3.3V
20124251
January 2005
www.national.com

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LM2736X EVAL Summary of contents

Page 1

... Typical Application Circuit WEBENCH ™ trademark of Transim. © 2005 National Semiconductor Corporation Features n Thin SOT23-6 package n 3.0V to 18V input voltage range n 1.25V to 16V output voltage range n 750mA output current n 550kHz (LM2736Y) and 1 ...

Page 2

Connection Diagrams 6-Lead TSOT NS Package Number MK06A Ordering Information Order Number Package Type LM2736XMK LM2736YMK TSOT-6 LM2736XMKX LM2736YMKX * Contact the local sales office for the lead-free package. Pin Description Pin 1 BOOST www.national.com ...

Page 3

... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications Voltage Boost Voltage Boost to SW Voltage FB Voltage EN Voltage Junction Temperature ESD Susceptibility (Note 2) Storage Temp. Range Electrical Characteristics Specifications with standard typeface are for T ture Range (T = -40˚ ...

Page 4

Typical Performance Characteristics ("X"), µH ("Y"), and T = 25˚C, unless specified otherwise. A Efficiency vs Load Current - "X" V Efficiency vs Load Current - "X" V Efficiency vs Load Current - "X" V www.national.com All ...

Page 5

Typical Performance Characteristics ("X"), µH ("Y"), and T = 25˚C, unless specified otherwise. (Continued) A Oscillator Frequency vs Temperature - "X" Current Limit vs Temperature V = 18V Temperature DSON ...

Page 6

Typical Performance Characteristics ("X"), µH ("Y"), and T = 25˚C, unless specified otherwise. (Continued) A Line Regulation - "X" 1.5V 500mA OUT OUT Line Regulation - "X" 3.3V 500mA ...

Page 7

Block Diagram Application Information THEORY OF OPERATION The LM2736 is a constant frequency PWM buck regulator IC that delivers a 750mA load current. The regulator has a preset switching frequency of either 550kHz (LM2736Y) or 1.6MHz (LM2736X). These high frequencies ...

Page 8

Application Information current. Therefore recommended that V greater than 2.5V above V for best efficiency should not exceed the maximum operating limit of 5.5V. SW > > 5.5V V – V 2.5V for best performance. ...

Page 9

Application Information FIGURE 5. Boost Voltage Supplied from the Shunt Zener ENABLE PIN / SHUTDOWN MODE The LM2736 has a shutdown mode that is controlled by the enable pin (EN). When a logic low voltage is applied ...

Page 10

Design Guide (Continued) The LM2736 operates at frequencies allowing the use of ceramic output capacitors without compromising transient response. Ceramic capacitors allow higher inductor ripple without significantly increasing output ripple. See the output capacitor section for more details on calculating ...

Page 11

Design Guide (Continued) OUTPUT VOLTAGE The output voltage is set using the following equation where R2 is connected between the FB pin and GND, and R1 is connected between V and the FB pin. A good value for R2 O ...

Page 12

... FIGURE 6. LM2736X (1.6MHz) V Derived from V BOOST 1.5V/750mA Bill of Materials for Figure 6 Part Number LM2736X C3216X5ROJ106M C3216X5ROJ106M C1005X7R1C103K Schottky 1A, 10VR MBRM110L 50mA Diode 1N4148W VLCF4020T- 4R7N1R2 CRCW06032001F CRCW06031002F CRCW06031003F 12 20124242 Manufacturer National Semiconductor TDK TDK TDK ON Semi Diodes, Inc. TDK Vishay Vishay Vishay ...

Page 13

... FIGURE 7. LM2736X (1.6MHz) V Derived from V BOOST OUT 12V to 3.3V/750mA Bill of Materials for Figure 7 Part Number LM2736X C3225X7R1E106M C3216X5ROJ226M C1005X7R1C103K SS1P3L 30mA Diode BAT17 VLCF4020T- 4R7N1R2 CRCW06031652F CRCW06031002F CRCW06031003F 13 20124243 Manufacturer National Semiconductor TDK TDK TDK Vishay Vishay TDK Vishay Vishay Vishay www.national.com ...

Page 14

... Bill of Materials for Figure 8 Part Number LM2736X C3225X7R1E106M C3216X5ROJ226M C1005X7R1C103K C1005X5R0J104K Schottky 1A, 30VR SS1P3L F @ 50mA Diode 1N4148W BZX84C5V1 SLF7032T-6R8M1R6 CRCW06032001F CRCW06031002F CRCW06031003F CRCW06034121F 14 20124244 Manufacturer National Semiconductor TDK TDK TDK TDK Vishay Diodes, Inc. Vishay TDK Vishay Vishay Vishay Vishay ...

Page 15

... Derived from Series Zener Diode (V BOOST 15V to 1.5V/750mA Bill of Materials for Figure 9 Part Number LM2736X C3225X7R1E106M C3216X5ROJ226M C1005X7R1C103K SS1P3L 1N4148W BZX84C11T SLF7032T-6R8M1R6 CRCW06032001F CRCW06031002F CRCW06031003F 15 20124249 ) IN Manufacturer National Semiconductor TDK TDK TDK Vishay Diodes, Inc. Diodes, Inc. TDK Vishay Vishay Vishay www.national.com ...

Page 16

... BOOST 15V to 9V/750mA Bill of Materials for Figure 10 Part Number LM2736X C3225X7R1E106M C3216X5R1C226M C1005X7R1C103K Schottky 1A, 30VR SS1P3L F @ 50mA Diode 1N4148W BZX84C4V3 SLF7032T-6R8M1R6 CRCW06036192F CRCW06031002F CRCW06031003F 16 20124250 ) OUT Manufacturer National Semiconductor TDK TDK TDK Vishay Diodes, Inc. Diodes, Inc. TDK Vishay Vishay Vishay ...

Page 17

... FIGURE 11. LM2736Y (550kHz) V Derived from V BOOST 1.5V/750mA Bill of Materials for Figure 11 Part Number LM2736Y C3216X5ROJ106M C3216X5ROJ226M C1005X7R1C103K MBRM110L 50mA Diode 1N4148W SLF7032T-100M1R4 CRCW06032001F CRCW06031002F CRCW06031003F 17 20124242 Manufacturer National Semiconductor TDK TDK TDK ON Semi Diodes, Inc. TDK Vishay Vishay Vishay www.national.com ...

Page 18

... FIGURE 12. LM2736Y (550kHz) V Derived from V BOOST OUT 12V to 3.3V/750mA Bill of Materials for Figure 12 Part Number LM2736Y C3225X7R1E106M C3216X5ROJ226M C1005X7R1C103K Schottky 1A, 30VR SS1P3L F @ 30mA Diode BAT17 F SLF7032T-100M1R4 CRCW06031652F CRCW06031002F CRCW06031003F 18 20124243 Manufacturer National Semiconductor TDK TDK TDK Vishay Vishay TDK Vishay Vishay Vishay ...

Page 19

... Bill of Materials for Figure 13 Part Number LM2736Y C3225X7R1E106M C3216X5ROJ226M C1005X7R1C103K C1005X5R0J104K SS1P3L 50mA Diode 1N4148W BZX84C5V1 SLF7045T-150M1R5 CRCW06032001F CRCW06031002F CRCW06031003F CRCW06034121F 19 20124244 Manufacturer National Semiconductor TDK TDK TDK TDK Vishay Diodes, Inc. Vishay TDK Vishay Vishay Vishay Vishay www.national.com ...

Page 20

... Derived from Series Zener Diode (V BOOST 15V to 1.5V/750mA Bill of Materials for Figure 14 Part Number LM2736Y C3225X7R1E106M C3216X5ROJ226M C1005X7R1C103K Schottky 1A, 30VR SS1P3L F @ 50mA Diode 1N4148W BZX84C11T SLF7045T-150M1R5 CRCW06032001F CRCW06031002F CRCW06031003F 20 20124249 ) IN Manufacturer National Semiconductor TDK TDK TDK Vishay Diodes, Inc. Diodes, Inc. TDK Vishay Vishay Vishay ...

Page 21

... Derived from Series Zener Diode (V BOOST 15V to 9V/750mA Bill of Materials for Figure 15 Part Number LM2736Y C3225X7R1E106M C3216X5R1C226M C1005X7R1C103K SS1P3L 1N4148W BZX84C4V3 SLF7045T-220M1R3-1PF CRCW06036192F CRCW06031002F CRCW06031003F 21 20124250 ) OUT Manufacturer National Semiconductor TDK TDK TDK Vishay Diodes, Inc. Diodes, Inc. TDK Vishay Vishay Vishay www.national.com ...

Page 22

... BANNED SUBSTANCE COMPLIANCE National Semiconductor certifies that the products and packing materials meet the provisions of the Customer Products Stewardship Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-111S2) and contain no ‘‘Banned Substances’’ as defined in CSP-9-111S2. ...

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