CS51411 Datasheet, PDF (1/16 Pages) ON Semiconductor – 1.5A, 260 kHz AND 520 kHz, LOW VOLTAGE BUCK REGULATORS WITH EXTERNAL BIAS OR SYNCHRONIZATION CAPABILITY

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 kHz. The regulators
use the V²ï£ª control architecture to provide unmatched transient
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.
The CS51411 and CS51413 contain synchronization circuitry. The
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.
The on–chip NPN transistor is capable of providing a minimum of
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
• V² Architecture Provides Ultra–Fast Transient Response, Improved
Regulation and Simplified Design
• 2.0% Error Amp Reference Voltage Tolerance
• Switch Frequency Decrease of 4:1 in Short Circuit Conditions
Reduces Short Circuit Power Dissipation
• BOOST Lead Allows “Bootstrapped” Operation to Maximize
Efficiency
• Sync Function for Parallel Supply Operation or Noise Minimization
• Shutdown Lead Provides Power–Down Option
• 85 µA Quiescent Current During Power–Down
• Thermal Shutdown
• Soft Start
• Pin–Compatible with LT1375 and LT1376
http://onsemi.com
8
1
SO–8
D SUFFIX
CASE 751
MARKING DIAGRAM
8
5141X
ALYWT
1
X
A
WL, L
YY, Y
WW, W
T
= 1, 2, 3 or 4
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Temperature Range, E or G
PIN CONNECTIONS
CS51411/3
1
BOOST
8
V_C
V_IN
V_FB
V_SW
GND
SHDNB
SYNC
CS51412/4
1
BOOST
8
V_C
V_IN
V_FB
V_SW
GND
BIAS
SHDNB
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 14 of this data sheet.
 Semiconductor Components Industries, LLC, 2002
1
September, 2002 – Rev. 11
Publication Order Number:
CS51411/D