參數(shù)資料
型號(hào)： LTC1759CG
廠商： LINEAR TECHNOLOGY CORP
元件分類(lèi)： 穩(wěn)壓器
英文描述： Smart Battery Charger
中文描述： 0.2 A BATTERY CHARGE CONTROLLER, 230 kHz SWITCHING FREQ-MAX, PDSO36
封裝： 0.209 INCH, PLASTIC, SSOP-36
文件頁(yè)數(shù)： 11/28頁(yè)
文件大?。?/td> 362K
代理商： LTC1759CG
11
LTC1759
Overview (Refer to Block Diagram and Figure 10)
The LTC1759 is composed of a battery charger section, a
charger controller, two 10-bit DACs to control charger
parameters, a thermistor decoder, limit decoder and an
SMBus controller block. If no battery is present, the
thermistor decoder indicates a THERM_OR condition and
charging is disabled by the charger controller (CHGEN =
Low). Charging will also be disabled if AC_PRESENT is
low, or the battery thermistor is decoded as THERM_HOT.
If a battery is inserted or AC power is connected, the
battery will be charged with an 80mA “wake-up” current.
The wake-up current is discontinued after three minutes
if the thermistor is decoded as THERM_UR or
THERM_COLD, and the battery or host doesn’t transmit
charging commands.
The SMBus controller block receives ChargingCurrent()
and ChargingVoltage() commands via the SMBus. If
ChargingCurrent() and ChargingVoltage() command pairs
are received within a three-minute interval, the values are
stored in the current and voltage DACs and the charger
controller asserts the CHGEN line if the decoded ther-
mistor value will allow charging to commence.
ChargingCurrent () and ChargingVoltage() values are com-
pared against limits programmed by the limit decoder
block; if the commands exceed the programmed limits
these limits are substituted and overrange flags are set.
The charger controller will assert INTB whenever a status
change is detected. The host may query the charger, via
the SMBus, to obtain ChargerStatus() information. INTB
will be deasserted upon a successful read of
ChargerStatus() or a successful Alert Response Address
(ARA) request.
Battery Charger Section
The LTC1759 is synchronous current mode PWM step-
down (Buck) switcher. The battery DC charging current is
programmed with a current DAC via the SMBus interface.
Amplifier CA1 converts the charging current through
R
SENSE
to a much lower current I
PROG
(I
PROG
= I
BAT
R
SENSE
/R
S2
) fed into the PROG pin. Amplifier CA2 com-
pares the output of CA1 with the programmed current and
drives the PWM loop to force them to be equal. High DC
OPERATIOU
accuracy is achieved with averaging capacitor C
PROG
.
Note that I
PROG
has both AC and DC components. I
PROG
generates a ramp signal that is fed to the PWM control
comparator C1 through buffer B1 and level shift resistors
forming the current mode inner loop. The BOOST pin
supplies the top power switch gate drive. The LTC1759
generates a 8.9V V
GBIAS
for bootstrapping V
BOOST
and
V
BOOSTC
as well as to drive the bottom power FET. The
BOOSTC pin supplies the current amplifier CA1 with a
voltage higher than V
CC
for low dropout applications.
Amplifier VA reduces the charging current when the bat-
tery voltage reaches the set voltage programmed by the
VDAC and the 2.465V reference voltage.
The amplifier CL1 monitors and limits the input current,
normally from the AC adapter, to a preset level (92mV/
R
CL
). At input current limit, CL1 will supply the program-
ming current I
PROG
and thus reduce battery charging
current.
The INFET pin drives an external input P-channel FET for
low dropout applications.
SMBus Interface
All communications over the SMBus are interpreted by the
SMBus controller block. The SMBus controller is an
SMBus slave device. All internal LTC1759 registers may
be updated and accessed through the SMBus controller,
and charger controller as required. The SMBus protocol is
a derivative of the I
2
C
TM
bus (Reference “I
2
C-Bus and How
to Use It, V1.0”by Philips and “System Management Bus
Specification”by the Smart Battery System Organiza-
tion*, for a complete description of the bus protocol
requirements.)
All data is clocked into the shift register on the rising edge
of SCL. All data is clocked out of the shift register on the
falling edge of SCL. Detection of an SMBus Stop condition,
or power-on reset via the V
DD
undervoltage lockout, will
reset the controller to an initial state at any time.
The LTC1759 command set is interpreted by the SMBus
controller and passed onto the charger controller block as
control signals or updates to internal registers.
I
2
C is a trademark of Philips Electronics N.V.
*http://www. SBS-FORUM.org
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參數(shù)描述
LTC1759CG#PBF 功能描述:IC SMART BATTERY CHARGER 36SSOP RoHS:是 類(lèi)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(lèi)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(chēng):497-10526-2
LTC1759CG#TR 功能描述:IC CHARGER SMART BATTERY 36SSOP RoHS:否 類(lèi)別:集成電路 (IC) >> PMIC - 電池管理 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 功能:電池監(jiān)控器 電池化學(xué):堿性，鋰離子，鎳鎘，鎳金屬氫化物 電源電壓:1 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:SOT-23-6 供應(yīng)商設(shè)備封裝:SOT-6 包裝:帶卷 (TR)
LTC1759CG#TRPBF 功能描述:IC SMART BATTERY CHARGER 36SSOP RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 電池管理 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 功能:電池監(jiān)控器 電池化學(xué):堿性，鋰離子，鎳鎘，鎳金屬氫化物 電源電壓:1 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:SOT-23-6 供應(yīng)商設(shè)備封裝:SOT-6 包裝:帶卷 (TR)
LTC1760CFW 功能描述:IC MANAGER BATTERY DUAL 48TSSOP RoHS:否 類(lèi)別:集成電路 (IC) >> PMIC - 電池管理 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 功能:電池監(jiān)控器 電池化學(xué):堿性，鋰離子，鎳鎘，鎳金屬氫化物 電源電壓:1 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:SOT-23-6 供應(yīng)商設(shè)備封裝:SOT-6 包裝:帶卷 (TR)
LTC1760CFW#PBF 功能描述:IC MANAGER BATTERY DUAL 48TSSOP RoHS:是 類(lèi)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(lèi)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(chēng):497-10526-2
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