LM2653MTCX-ADJ National Semiconductor, LM2653MTCX-ADJ Datasheet

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LM2653MTCX-ADJ

Manufacturer Part Number
LM2653MTCX-ADJ
Description
Conv DC-DC Single Step Down 4V to 14V 16-Pin TSSOP T/R
Manufacturer
National Semiconductor
Type
Step Downr
Datasheet

Specifications of LM2653MTCX-ADJ

Package
16TSSOP
Number Of Outputs
1
Minimum Input Voltage
4 V
Maximum Input Voltage
14 V
Switching Frequency
330 KHz
Operating Supply Voltage
4 to 14 V
Maximum Output Current
1.5 A
Output Type
Adjustable
Output Voltage
1.5 to 5 V
Switching Regulator
Yes
Efficiency
97 %
Operating Temperature
-40 to 125 °C

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© 2005 National Semiconductor Corporation
LM2653
1.5A High Efficiency Synchronous Switching Regulator
General Description
The LM2653 switching regulator provides high efficient
power conversion over a 100:1 load range (1.5A to 15 mA).
This feature makes the LM2653 an ideal fit in battery-
powered applications.
Synchronous rectification is used to achieve up to 97%
efficiency. At light loads, the LM2653 enters a low power
hysteretic or “sleep” mode to keep the efficiency high. In
many applications, the efficiency still exceeds 80% at 15 mA
load. A shutdown pin is available to disable the LM2653 and
reduce the supply current to 7µA.
All the power, control, and drive functions are integrated
within the ICs. The ICs contain patented current sensing
circuity for current mode control. This feature eliminates the
external current sensing resistor required by other current-
mode DC-DC converters.
The ICs have a 300 kHz fixed frequency internal oscillator.
The high oscillator frequency allows the use of extremely
small, low profile components.
Protection features include thermal shutdown, input under-
voltage lockout, adjustable soft-start, cycle by cycle current
limit, output overvoltage and undervoltage protections.
Typical Application
Efficiency vs Load Current
(V
IN
= 5V, V
OUT
= 3.3V)
10104902
DS101049
Features
n Efficiency up to 97%
n 4V to 14V input voltage range
n 1.5V to 5.0V adjustable output voltage
n 0.1Ω Switch On Resistance
n 300 kHz fixed frequency internal oscillator
n 7 µA shutdown current
n Patented current sensing for current mode control
n Input undervoltage lockout
n Output overvoltage shutdown protection
n Output undervoltage shutdown protection
n Adjustable soft-start
n Adjustable PGOOD delay
n Current limit and thermal shutdown
Applications
n Webpad
n Personal digital assistants (PDAs)
n Computer peripherals
n Battery-powered devices
n Notebook computer video supply
n Handheld scanners
n GXM I/O and core voltage
n High efficiency 5V conversion
www.national.com
April 2005
10104930

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LM2653MTCX-ADJ Summary of contents

Page 1

... Typical Application Efficiency vs Load Current ( 3.3V) IN OUT 10104902 © 2005 National Semiconductor Corporation Features n Efficiency 14V input voltage range n 1.5V to 5.0V adjustable output voltage n 0.1Ω Switch On Resistance n 300 kHz fixed frequency internal oscillator n 7 µA shutdown current n Patented current sensing for current mode control ...

Page 2

... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Input Voltage PGOOD Pin Voltage Feedback Pin Voltage Power Dissipation (T =25˚C), A (Note 2) Junction Temperature Range Storage Temperature Range Electrical Characteristics Specifications with standard typeface are for T Range ...

Page 3

Electrical Characteristics Specifications with standard typeface are for T Range 10V unless otherwise specified. IN Symbol Parameter V Bootstrap Regulator Voltage I BOOT G Error Amplifier M Transconductance A Error Amplifier Voltage Gain V I Error Amplifier Source ...

Page 4

Electrical Characteristics Note 2: The maximum allowable power dissipation is calculated by using P ambient temperature, and θ is the junction-to-ambient thermal resistance of the specified package. The 893 mW rating results from using 150˚C, 25˚C, and JA , and ...

Page 5

Typical Performance Characteristics R vs Junction Temperature SW(ON) Current Limit vs Junction Temperature (V Sleep Mode Threshold vs Output Voltage (V (Continued) Current Limit vs Input Voltage (V 10104924 = 2.5V) Reference Voltage vs Junction Temperature OUT 10104928 = 5V) ...

Page 6

Connection Diagram Pin Description Pin Name 1 SD(SS COMP 11 PGOOD 12 LDELAY 13 AGND 14-16 PGND www.national.com 16-Lead TSSOP (MTC) 10104914 Top View Order Number ...

Page 7

... The output voltage starts to drop until it hits the low threshold of the hysteretic comparator, and the part immediately goes back to the PWM operation. The output ...

Page 8

Operation (Continued) CAPACITOR section for more information.) Toggling the in- put supply voltage or the shutdown pin can reset the device from the latched protection mode. Design Procedure This section presents guidelines for selecting external com- ponents. INPUT CAPACITOR A ...

Page 9

Design Procedure (Continued) R and R (PROGRAMMING OUTPUT VOLTAGE Use the following formula to select the appropriate resistor values OUT REF 1 where V = 1.238V REF Select resistors between 10kΩ ...

Page 10

Typical PC Board Layout: (2X Size) www.national.com Component Placement Guide Component Side PC Board Layout 10 10104919 10104920 ...

Page 11

Typical PC Board Layout: (2X Size) (Continued) Solder Side PC Board Layout 11 10104921 www.national.com ...

Page 12

... BANNED SUBSTANCE COMPLIANCE National Semiconductor manufactures products and uses packing materials that 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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