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MAX471

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Technical/Catalog InformationMAX4711CSE+
VendorMaxim Integrated Products
CategoryIntegrated Circuits (ICs)
TypeSwitch
Voltage Supply SourceSingle, Dual Supply
Voltage - Supply, Single/Dual (±)2.7 V ~ 11 V, ±2.7 V ~ 5.5 V
Circuit4 x SPST-NC
On-State Resistance25 Ohm
Mounting TypeSurface Mount
Package / Case16-SOIC (3.9mm Width)
PackagingTube
Current - Supply-
Operating Temperature0°C ~ 70°C
FunctionSwitch
Drawing Number175; 21-0041; SE; 16
Lead Free StatusLead Free
RoHS StatusRoHS Compliant
Other Names MAX4711CSE+
MAX4711CSE+

Product Manufacturers Pack D/C
MAX471 - - -

Pinout/Connection Diagram

max471 Circuit
This current-source battery charger can source 2.5 A with up to 96 percent efficiency. It can operate from an ac adapter or directly from a car battery. By sensing current on the high side of the battery being charged, it preserves the low impedance of the automobile's ground-return system. The charger handles battery stacks of 5 to 15 cells, and its input voltage can range from 28 V down to a level 1.5 V above the terminal voltage of a fully charged battery. Charging current is generated by the current-mode, buck-regulator controller IC1, operating with an external power switch (Q1) and a synchronous rectifier (Q2). Both are N-channel MOSFETs, whose low on-resistance (vs. P-channel types) contributes to high efficiency in the circuit. The IC includes a charge pump for generating the required positive gate voltage for Q1. It also senses the Q1 current (via R1) and shuts down if this current becomes excessive.
 
The current-sense transformer (T1) saves power by diverting a fraction of Q1's current through R1. Operating on the output's high side is the current-sense amplifier IC2. Its OUT current (1/2000 of the current flowing internally from RS+ to RS-) flows through R2 to produce a feedback signal for IC1. Digital control of the charging current can be introduced by switching among different-switching FETs like the 2N7002; its 7.5-Ω on-resistance is not a problem because its drain current-no greater than 1.25 mA-introduces an error no greater than 0.5 percent. Circuit efficiency ranges up to 96 percent. Efficiency and power output both increase with output voltage, because the circuit's power consumption (associated mainly with IC1 and the switching MOSFETs) is almost constant. This buck regulator's output cannot rise about Vin in most cases, overvoltage protection is not required. VOUT which supplies power to IC2, must not go below 4 V.

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PDF / Datasheet

MAX471 PDF Download

MAX471

File Size: 123685 KB
Manufacturer: MAXIM [Maxim Integrated Products]

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