參數(shù)資料
型號(hào)： LT3652EDD#TRPBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： 3 A BATTERY CHARGE CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO12
封裝： 3 X 3 MM, LEAD FREE, PLASTIC, DFN-12
文件頁(yè)數(shù)： 4/26頁(yè)
文件大小： 253K
代理商： LT3652EDD#TRPBF
LT3652
12
3652fc
ripple current in the charger, so it must have an adequate
ripple current rating. RMS ripple current (ICVIN(RMS)) is:
ICVIN(RMS)ICHG(MAX)(VBAT /VIN)([VIN/VBAT]–1)1/2,
where ICHG(MAX) is the maximum average charge current
(100mV/RSENSE). The above relation has a maximum at
VIN = 2 VBAT, where:
ICVIN(RMS) = ICHG(MAX)/2.
The simple worst-case of ICHG(MAX) is commonly
used for design.
Bulk capacitance is a function of desired input ripple volt-
age (ΔVIN), and follows the relation:
CIN(BULK) = ICHG(MAX) (VBAT/VIN) / ΔVIN (μF)
Input ripple voltages above 0.1V are not recommended.
10μF is typically adequate for most charger applica-
tions.
Charge Current Programming
The LT3652 charger is configurable to charge at average
currents as high as 2A. Maximum charge current is set by
choosing an inductor sense resistor (RSENSE) such that
the desired maximum average current through that sense
resistor creates a 100mV drop, or:
RSENSE = 0.1 / ICHG(MAX)
where ICHG(MAX) is the maximum average charge current.
A 2A charger, for example, would use a 0.05Ω sense
resistor.
BOOST Supply
The BOOST bootstrapped supply rail drives the internal
switch and facilitates saturation of the switch transistor.
Operating range of the BOOST pin is 0V to 8.5V, as refer-
APPLICATIONS INFORMATION
Figure 1. Programming Maximum Charge
Current Using RSENSE
SW
BOOST
SENSE
BAT
RSENSE
LT3652
3652 F01
enced to the SW pin. Connect a 1μF or greater capacitor
from the BOOST pin to the SW pin.
The voltage on the decoupling capacitor is refreshed
through a diode, with the anode connected to either the
battery output voltage or an external source, and the
cathode connected to the BOOST pin. Rate the diode
average current greater than 0.1A, and reverse voltage
greater than VIN(MAX).
To refresh the decoupling capacitor with a rectifying diode
from the battery with battery float voltages higher than
8.4V, a >100mA Zener diode can be put in series with
the rectifying diode to prevent exceeding the BOOST pin
operating voltage range.
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