參數(shù)資料
型號(hào)： LTC3559EUD
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： 1.05 A BATTERY CHARGE CONTROLLER, 2590 kHz SWITCHING FREQ-MAX, PQCC16
封裝： 3 X 3 MM, PLASTIC, MO-220WEED-2, QFN-16
文件頁(yè)數(shù)： 10/24頁(yè)
文件大?。?/td> 302K
代理商： LTC3559EUD
LTC3559
18
3559f
APPLICATIONS INFORMATION
Average, rather than instantaneous, battery current may be
of interest to the user. For example, if a switching power
supply operating in low-current mode is connected in
parallel with the battery, the average current being pulled
out of the BAT pin is typically of more interest than the
instantaneous current pulses. In such a case, a simple RC
lter can be used on the PROG pin to measure the average
battery current as shown in Figure 6. A 10k resistor has
been added between the PROG pin and the lter capacitor
to ensure stability.
the current from building up in the cable too fast thus
dampening out any resonant overshoot.
Buck Switching Regulator General Information
The LTC3559 contains two 2.25MHz constant-frequency
current mode switching regulators that provide up to
400mA each. Both switchers can be programmed for a
minimum output voltage of 0.8V and can be used to power
a microcontroller core, microcontroller I/O, memory or
other logic circuitry. Both regulators support 100% duty
cycle operation (dropout mode) when the input voltage
drops very close to the output voltage and are also capable
of operating in Burst Mode operation for highest efcien-
cies at light loads (Burst Mode operation is pin selectable).
The switching regulators also include soft-start to limit
inrush current when powering on, short circuit current
protection, and switch node slew limiting circuitry to
reduce radiated EMI.
A single MODE pin sets both regulators in Burst Mode
operation or pulse skip operating mode while each regula-
tor is enabled individually through their respective enable
pins EN1 and EN2. The buck regulators input supply (PVIN)
should be connected to the battery pin (BAT). This allows
the undervoltage lockout circuit on the BAT pin to disable
the buck regulators when the BAT voltage drops below
2.45V. Do not drive the buck switching regulators from
a voltage other than BAT. A 2.2μF decoupling capacitor
from the PVIN pin to GND is recommended.
Buck Switching Regulator
Output Voltage Programming
Both switching regulators can be programmed for output
voltages greater than 0.8V. The output voltage for each
buck switching regulator is programmed using a resistor
divider from the switching regulator output connected to
the feedback pins (FB1 and FB2) such that:
VOUT = 0.8(1 + R1/R2)
Typical values for R1 are in the range of 40k to 1M. The
capacitor CFB cancels the pole created by feedback re-
sistors and the input capacitance of the FB pin and also
helps to improve transient response for output voltages
much greater than 0.8V. A variety of capacitor sizes can
be used for CFB but a value of 10pF is recommended for
3559 F06
CFILTER
CHARGE
CURRENT
MONITOR
CIRCUITRY
RPROG
LTC3559
PROG
GND
10k
Figure 6. Isolated Capacitive Load on PROG Pin and Filtering
USB Inrush limiting
When a USB cable is plugged into a portable product,
the inductance of the cable and the high-Q ceramic input
capacitor form an L-C resonant circuit. If there is not
much impedance in the cable, it is possible for the voltage
at the input of the product to reach as high as twice the
USB voltage (~10V) before it settles out. In fact, due to
the high voltage coefcient of many ceramic capacitors
(a nonlinearity), the voltage may even exceed twice the
USB voltage. To prevent excessive voltage from damag-
ing the LTC3559 during a hot insertion, the soft connect
circuit in Figure 7 can be employed.
In the circuit of Figure 7, capacitor C1 holds MP1 off when
the cable is rst connected. Eventually C1 begins to charge
up to the USB voltage applying increasing gate support
to MP1. The long time constant of R1 and C1 prevents
Figure 7. USB Soft Connect Circuit
R1
40k
5V USB
INPUT
3559 F07
C1
100nF
C2
10
μF
MP1
Si2333
USB CABLE
VCC
GND
LTC3559
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC3559EUD#PBF 功能描述:IC USB CHARGER 16-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 其它有關(guān)文件:STC3100 View All Specifications 特色產(chǎn)品:STC3100 - Battery Monitor IC 標(biāo)準(zhǔn)包裝:4,000 系列:- 功能:燃料，電量檢測(cè)計(jì)/監(jiān)控器 電池化學(xué):鋰離子（Li-Ion） 電源電壓:2.7 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP，8-MSOP（0.118"，3.00mm 寬） 供應(yīng)商設(shè)備封裝:8-MiniSO 包裝:帶卷 (TR) 其它名稱:497-10526-2
LTC3559EUD#PBF 制造商:Linear Technology 功能描述:IC BATT CHARGER W/BUCK REG 16QFN 制造商:Linear Technology 功能描述:IC, BATT CHARGER, W/BUCK REG, 16QFN
LTC3559EUD#TRPBF 功能描述:IC USB CHARGER 16-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標(biāo)準(zhǔn)包裝:61 系列:- 功能:電源管理 電池化學(xué):鋰離子（Li-Ion）、鋰聚合物（Li-Pol） 電源電壓:4.35 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:22-WFDFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:22-DFN（6x3）裸露焊盤(pán) 包裝:管件
LTC3559EUD-1#PBF 功能描述:IC USB BATTERY CHARGER 16-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標(biāo)準(zhǔn)包裝:61 系列:- 功能:電源管理 電池化學(xué):鋰離子（Li-Ion）、鋰聚合物（Li-Pol） 電源電壓:4.35 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:22-WFDFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:22-DFN（6x3）裸露焊盤(pán) 包裝:管件
LTC3559EUD-1#TRPBF 功能描述:IC USB BATTERY CHARGER 16-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標(biāo)準(zhǔn)包裝:61 系列:- 功能:電源管理 電池化學(xué):鋰離子（Li-Ion）、鋰聚合物（Li-Pol） 電源電壓:4.35 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:22-WFDFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:22-DFN（6x3）裸露焊盤(pán) 包裝:管件
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