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LTC4012IUF-3-PBF Datasheet(PDF) 9 Page - Linear Technology

Part # LTC4012IUF-3-PBF
Description  High Efficiency, Multi-Chemistry Battery Charger with PowerPath Control
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4012IUF-3-PBF Datasheet(HTML) 9 Page - Linear Technology

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40123fb
LTC4012-3
pin FuncTions
BGATE (Pin 16): External Synchronous NFET Gate Control
Output.ThisoutputprovidesgatedrivetoanexternalNMOS
powertransistorswitchusedforsynchronousrectification
to increase efficiency in the step-down DC/DC converter.
Operating voltage is GND to INTVDD. BGATE should be
left floating if not used.
INTVDD (Pin 17): Internal 5V Regulator Output. This pin
provides a means of bypassing the internal 5V regulator
used to power the LTC4012-3 PWM FET drivers. This sup-
ply shuts down when the LTC4012-3 shuts down. Refer to
the Application Information section for details if additional
power is drawn from this pin by the application circuit.
SW (Pin 18): PWM Switch Node. The LTC4012-3 uses the
voltage on this pin as the source reference for its topside
NFET (PWM switch) driver. Refer to the Applications In-
formation section for additional PCB layout suggestions
related to this critical circuit node. Operating voltage range
is GND to CLN.
TGATE(Pin19):ExternalNFETSwitchGateControlOutput.
ThisoutputprovidesgatedrivetoanexternalNMOSpower
transistor switch used in the DC/DC converter. Operating
voltage range is GND to (CLN + 5V).
BOOST (Pin 20): TGATE Driver Supply Input. A bootstrap
capacitor is returned to this pin from a charge network
connected to SW and INTVDD. Refer to the Applications
Information section for complete details on circuit topol-
ogyandcomponentvalues.Operatingvoltagerangesfrom
(INTVDD – 1V) to (CLN + 5V).
GND (Exposed Pad Pin 21): Ground. The package paddle
provides a single-point ground for the internal voltage
referenceandothercriticalLTC4012-3circuits.Itshouldbe
soldered to a suitable PCB copper ground pad for proper
electrical operation and to obtain the specified package
thermal resistance.


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