L6902D013TR ,1A CONSTANT CURRENT BATTERY CHARGERAPPLICATIONSrate (±5%). Moreover constant current control can be■ CHARGERS FOR NiCd, NiMH BATTERIES ..
L6910 ,ADJUSTABLE STEP DOWN CONTROLLER WITH SYNCHRONOUS RECTIFICATIONL6910ADJUSTABLE STEP DOWN CONTROLLERWITH SYNCHRONOUS RECTIFICATIONFEATURE■ OPERATING SUPPLY VOLTAG ..
L6910A ,ADJUSTABLE STEP DOWN CONTROLLER WITH SYNCHRONOUS RECTIFICATIONElectrical Characteristics (V = 12V, T =25°C unless otherwise specified)cc JSymbol Parameter Test C ..
L6910ATR ,ADJUSTABLE STEP DOWN CONTROLLER WITH SYNCHRONOUS RECTIFICATIONFEATURES■ OPERATING SUPPLY VOLTAGE FROM 5V TO 12V BUSES■ UP TO 1.3A GATE CURRENT CAPABILITY■ ADJUST ..
L6910G ,Adjustable step down controller with synchronous rectificationFEATURES■ OPERATING SUPPLY VOLTAGE FROM 5V TO 12V BUSES■ UP TO 1.3A GATE CURRENT CAPABILITY■ ADJUST ..
L6910GTR ,Adjustable step down controller with synchronous rectificationElectrical Characteristics (V = 12V, T =25°C unless otherwise specified)cc JSymbol Parameter Test C ..
LC4064ZC-75M56I , 3.3V/2.5V/1.8V In-System Programmable SuperFAST High Density PLDs
LC4064ZC-75MN132C , 3.3V/2.5V/1.8V In-System Programmable SuperFAST High Density PLDs
LC4064ZC-75T48C , 3.3V/2.5V/1.8V In-System Programmable SuperFAST High density PDLs
LC4064ZC-75TN48C , 3.3V/2.5V/1.8V In-System Programmable SuperFAST High Density PLDs
LC4064ZE-7TN100C , 1.8V In-System Programmable Ultra Low Power PLDs
LC4064ZE-7TN48C , 1.8V In-System Programmable Ultra Low Power PLDs
L6902D-L6902D013TR
1A CONSTANT CURRENT BATTERY CHARGER
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L6902DJune 2002 UP TO 1A OUTPUT CURRENT OPERATING INPUT VOLTAGE FROM 8V TO 36V PRECISE 3.3V (±2%) REFERENCE VOLTAGE 5% OUTPUT CURRENT ACCURACY OUTPUT VOLTAGE ADJUSTABLE FROM
1.235V TO 34V 250KHz INTERNALLY FIXED FREQUENCY VOLTAGE FEEDFORWARD ZERO LOAD CURRENT OPERATION ADJUSTABLE CURRENT LIMIT PROTECTION AGAINST FEEDBACK
DISCONNECTION THERMAL SHUTDOWN
APPLICATIONS CHARGERS FOR NiCd, NiMH BATTERIES
AND PREREGULATOR FOR LITHIUM-ION
BATTERIES ADJUSTABLE CURRENT GENERATOR SIMPLE STEP-DOWN CONVERTERS WITH
ADJUSTABLE CURRENT LIMIT BATTERY EQUIPPED SYSTEMS DISTRIBUTED POWER SUPPLY MOBILE PC & SUBNOTEBOOK
DESCRIPTIONThe L6902D is a complete and simple step down
switching regulator with adjustable current limit.
Based on a voltage mode structure it integrates a cur-
rent error amplifier to have a constant voltage and con-
stant current control.
By means of an on board current sense resistor and
the availability of the current sense pins (both com-
patible to Vcc and for Cs- compatible with GND too)
a current limit programming is very simple and accu-
rate (±5%). Moreover constant current control can be
used to charge NiMH and NiCd batteries.
The device can be used as a standard DC/DC con-
verter with adjustable current limit (set by using the
external sense resistor).
The internal robust P-Channel DMOS transistor with a
typical of 250mΩ assures high efficiency and a mini-
mum dropout even at high output current level. The in-
ternal limiting current (latched function) of typical value
of 2.5A protects the device from accidental output short
circuit avoiding dangerous loads damage.
If the temperature of the chip goes higher than a fixed
internal threshold (150°C with 20°C hysteresis), the
power stage is turned off.
UP TO 1A SWITCHING REGULATOR WITH
ADJUSTABLE CURRENT LIMIT
TEST AND APPLICATION CIRCUIT
L6902D 2/6
DESCRIPTION (Continued)Other protections beside thermal shutdown complete the device for a safe and reliable application: overvoltage
protection, frequency folback overcurrent protection and protection vs. feedback disconnection.
The internal fixed switching frequency of 250KHz, and the SO-8 package pin allow to built an ultra compact DC/
DC converter with a minimum board space.
PIN CONNECTION
PIN DESCRIPTION
THERMAL DATA(*) Package mounted on board.
ABSOLUTE MAXIMUM RATINGS
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L6902D
INTERNAL BLOCK DIAGRAM
ELECTRICAL CHARACTERISTCS (Tj = 25°C, VCC = 12V, unless otherwise specified.) (•) Specification Referred to Tj from 0 to 125°C.
L6902D 4/6
ELECTRICAL CHARACTERISTCS (continued)(Tj = 25°C, VCC = 12V, unless otherwise specified.) (•) Specification Referred to Tj from 0 to 125°C.
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L6902D
. consequences
of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted
by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject
to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not
authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.
The ST logo is a registered trademark of STMicroelectronics
© 2002 STMicroelectronics - All Rights Reserved
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L6902D
