cs51412g ON Semiconductor, cs51412g Datasheet

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cs51412g

Manufacturer Part Number
cs51412g
Description
1.5a, 260 Khz And 520 Khz, Low Voltage Buck Regulators With External Bias Or Synchronization Capability
Manufacturer
ON Semiconductor
Datasheet

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CS51411, CS51412,
CS51413, CS51414
1.5 A, 260 kHz and 520 kHz,
Low Voltage Buck
Regulators with External
Bias or Synchronization
Capability
are fixed-frequency operating at 260 kHz and 520 kHz. The regulators
use the V
response, the best overall regulation and the simplest loop
compensation for today's high-speed logic. These products
accommodate input voltages from 4.5 V to 40 V.
CS51412 and CS51414 have the option of powering the controller
from an external 3.3 V to 6.0 V supply in order to improve efficiency,
especially in high input voltage, light load conditions.
1.5 A of output current, and is biased by an external “boost” capacitor
to ensure saturation, thus minimizing on-chip power dissipation.
Protection circuitry includes thermal shutdown, cycle-by-cycle
current limiting and frequency foldback. The CS51411 and CS51413
are functionally pin-compatible with the LT1375. The CS51412 and
CS51414 are functionally pin-compatible with the LT1376.
Features
© Semiconductor Components Industries, LLC, 2007
September, 2007 - Rev. 18
The CS5141X products are 1.5 A buck regulator ICs. These devices
The CS51411 and CS51413 contain synchronization circuitry. The
The on-chip NPN transistor is capable of providing a minimum of
Regulation and Simplified Design
Reduces Short Circuit Power Dissipation
Efficiency
V
2.0% Error Amp Reference Voltage Tolerance
Switch Frequency Decrease of 4:1 in Short Circuit Conditions
BOOST Lead Allows “Bootstrapped” Operation to Maximize
Sync Function for Parallel Supply Operation or Noise Minimization
Shutdown Lead Provides Power-Down Option
85 mA Quiescent Current During Power-Down
Thermal Shutdown
Soft-Start
Pin-Compatible with LT1375 and LT1376
Pb-Free Packages are Available
2
Architecture Provides Ultrafast Transient Response, Improved
2
™ control architecture to provide unmatched transient
1
See detailed ordering and shipping information in the package
dimensions section on page 18 of this data sheet.
18-LEAD DFN
MN SUFFIX
CASE 751
CASE 505
8
D SUFFIX
SOIC-8
ORDERING INFORMATION
1
5141x = Device Code
A
L, WL = Wafer Lot
Y, YY
W, WW = Work Week
G
1
http://onsemi.com
18
= Assembly Location
= Year
= Pb-Free Package
x = 1, 2, 3 or 4
y = E or G
MARKING DIAGRAMS
Publication Order Number:
1
1
8
AWLYYWW G
CS5141xy
ALYWy
5141x
G
G
CS51411/D
18

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cs51412g Summary of contents

Page 1

CS51411, CS51412, CS51413, CS51414 1.5 A, 260 kHz and 520 kHz, Low Voltage Buck Regulators with External Bias or Synchronization Capability The CS5141X products are 1.5 A buck regulator ICs. These devices are fixed-frequency operating at 260 kHz and 520 ...

Page 2

CS51411, CS51412, CS51413, CS51414 CS51411 BOOST GND SW SHDNB SYNC CS51412 BOOST GND SW BIAS SHDNB PACKAGE PIN DESCRIPTION SOIC-8 DFN18 Package ...

Page 3

... CS51411, CS51412, CS51413, CS51414 PRODUCT SELECTION GUIDE Part Number Frequency CS51411E CS51411G CS51412E CS51412G CS51413E CS51413G CS51414E CS51414G 4 100 mF 4 Shutdown 5 SYNC 0.1 mF Figure 1. Application Diagram 1.0 A Converter MAXIMUM RATINGS Operating Junction Temperature Range, T Lead Temperature Soldering: Storage Temperature Range, T ...

Page 4

CS51411, CS51412, CS51413, CS51414 MAXIMUM RATINGS Pin Name V Max BOOST 7 SHDNB 7.0 V SYNC 7.0 V BIAS 7 7 GND 7.0 ...

Page 5

CS51411, CS51412, CS51413, CS51414 ELECTRICAL CHARACTERISTICS (-40°C < T 0°C < T < 70°C (CS51411G/2G/3G/4G), 4.5 V< Characteristic Sync Sync Frequency Range Sync Frequency Range Sync Pin Bias Current Sync Threshold Voltage Shutdown Shutdown Threshold Voltage Shutdown Pin ...

Page 6

CS51411, CS51412, CS51413, CS51414 SHDNB V IN Shutdown Comparator 2.9 V LDO + Voltage BIAS Regulator - 1 1.270 V - Amplifier SYNC 5.0 mA Artificial Oscillator Ramp + - ∑ PWM ...

Page 7

CS51411, CS51412, CS51413, CS51414 THEORY OF OPERATION 2 V Control The CS5141X family of buck regulators utilizes a V2 control technique and provides a high level of integration to enable high power density design optimization. Every pulse width modulated controller ...

Page 8

CS51411, CS51412, CS51413, CS51414 Control Ramp Generation In original V2 designs, the control ramp VCR was generated from the converter's output ripple. Using a current derived ramp provides the same benefits as current mode, namely input feed forward, single pole ...

Page 9

CS51411, CS51412, CS51413, CS51414 Some representative efficiency data is shown in Figure 10. 100 Vin = 5.5 V, Vout= 3 Vin = 7.5 V, Vout = 5.0 V Vin = 15V, Vout = 12 V ...

Page 10

CS51411, CS51412, CS51413, CS51414 independent of switching duty cycle. The maximum load current, given by the following formula under continuous conduction mode, is less than the Current Limit due to the ripple current ...

Page 11

CS51411, CS51412, CS51413, CS51414 The Soft-Start duration can be calculated COMP SOURCE where pin steady-state voltage, which is approximately C C equal to error amplifier's reference voltage ...

Page 12

CS51411, CS51412, CS51413, CS51414 The power dissipated by the IC due to this current BASE + V IN where switching current. S When the power switch turns on, the saturation voltage and ...

Page 13

CS51411, CS51412, CS51413, CS51414 The RMS current of the input capacitor can be calculated using: I RMS + where switching duty cycle which is equal load current. O Figure ...

Page 14

CS51411, CS51412, CS51413, CS51414 Figure 20. The Output Voltage Ripple Using Two 10 mF Ceramic Capacitors in Parallel Figure 21. The Output Voltage Ripple Using One 100 mF POSCAP Capacitor Figure 22. The Output Voltage Ripple Using One 100 mF ...

Page 15

... For the diode to survive the short circuit condition, the current rating of the diode should be equal to the Foldback Current Limit. See Table 1 for Schottky diodes from ON Semiconductor which are suggested for CS5141X regulator. Inductor Selection ...

Page 16

CS51411, CS51412, CS51413, CS51414 Table 1. Part Number V BREAKDOWN 1N5817 1N5818 1N5819 MBR0520 MBR0530 MBR0540 MBRS120 MBRS130 MBRS140 Table 2. Vendor Coiltronics THIN-PAC: SMT, toroid, low profile Coilcraft DS/DT 1608: SMT, barrel, magnetically shielded DS/DT 3316: SMT, barrel, magnetically ...

Page 17

CS51411, CS51412, CS51413, CS51414 5 input Figure 24. Additional Application Diagram, 5 -5.0 V/400 mA Inverting Converter ...

Page 18

... CS51414EDR8G CS51414EMNR2G CS51411GD8 CS51411GD8G CS51411GDR8 CS51411GDR8G CS51411GMNR2G CS51412GD8 CS51412GD8G CS51412GDR8 CS51412GDR8G CS51412GMNR2G CS51413GD8 CS51413GD8G CS51413GDR8 CS51413GDR8G CS51413GMNR2G CS51414GD8 CS51414GD8G CS51414GDR8 CS51414GDR8G CS51414GMNR2G †For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D ...

Page 19

... G C SEATING PLANE - 0.25 (0.010 *For additional information on our Pb-Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D. PACKAGE THERMAL DATA Parameter R qJC R qJA PACKAGE DIMENSIONS SOIC-8 NB CASE 751-07 ISSUE ...

Page 20

... 0.05 C NOTE 3 *For additional information on our Pb-Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D. Parameter Typical N. American Technical Support: 800-282-9855 Toll Free  USA/Canada Europe, Middle East and Africa Technical Support:  Phone: 421 33 790 2910 Japan Customer Focus Center   ...

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