參數(shù)資料
型號(hào)： LT3652HVEDD#PBF
廠商： LINEAR TECHNOLOGY CORP
元件分類(lèi)： 穩(wěn)壓器
英文描述： BATTERY CHARGE CONTROLLER, PDSO12
封裝： 3 X 3 MM, LEAD FREE, PLASTIC, DFN-12
文件頁(yè)數(shù)： 4/24頁(yè)
文件大小： 250K
代理商： LT3652HVEDD#PBF
LT3652HV
12
3652hvf
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 LT3652HV charger is configurable to charge at aver-
age 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-
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.
APPLICATIONS INFORMATION
Figure 1. Programming Maximum Charge
Current Using RSENSE
SW
BOOST
SENSE
BAT
RSENSE
LT3652HV
3652 F01
Figure 2. Zener Diode Reduces Refresh
Voltage for BOOST Pin
SW
BOOST
SENSE
BAT
LT3652HV
3652 F02
VIN / BOOST Start-Up Requirement
The LT3652HV operates with a VIN range of 4.95V to 34V,
however, a start-up voltage requirement exists due to
the nature of the non-synchronous step-down switcher
topology used for the charger. If there is no BOOST supply
available, the internal switch requires (VIN – VSW) ≥ 3.3V
to reliably operate. This requirement does not exist if the
BOOST supply is available and (VBOOST – VSW) > 2V.
When an LT3652HV charger is not switching, the SW pin
is at the same potential as the battery, which can be as
high as VBAT(FLT). As such, for reliable start-up, the VIN
supply must be at least 3.3V above VBAT(FLT). Once switch-
ing begins and the BOOST supply capacitor gets charged
such that (VBOOST – VSW) > 2V, the VIN requirement no
longer applies.
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