參數(shù)資料
型號： LTC1760
廠商： Linear Technology Corporation
英文描述： Dual Smart Battery System Manager
中文描述： 雙智能電池系統(tǒng)管理
文件頁數(shù)： 36/44頁
文件大?。?/td> 379K
代理商： LTC1760
LTC1760
36
sn1760 1760is
R
ILIMIT
is the value of the resistance from I
LIMIT
to
GND.
I
SMB
is the current used for communicating with the
SMBus Host and depends on the amount of bus
traffic.
I
SMB_BATX
is the current used for communicating
with Battery1 or Battery2.
I
SMB_BATX
= 350
μ
A 0.0155 = 5.425
μ
A.
I
SMBALERT
is defined in “Electrical Characteristics”.
Sample calculation of I
DCIN_CHG
with two Li-Ion batteries
(R
THX
= 400), R
VLIMIT
= R
ILIMIT
= 30k, V
CC2
= 5.2V, and no
SMBus Host communication:
I
DCIN_CHG
=I
CH1
+ I
VCC2_AC1
+ I
SAFETY1
+ I
SAFETY2
+
I
VLIM
+ I
ILIM
+ I
SMB
+ I
SMB_BAT1
+ I
SMB_BAT2
+
I
SMBALERT
= 1.3mA + 700
μ
A + 218
μ
A + 218
μ
A +81
μ
A + 81
μ
A
+ 0
μ
A + 5.4
μ
A + 5.4
μ
A + 0
μ
A = 2.62mA
The total operating current through BAT1 and BAT2 when
AC is not present (I
BAT_NOAC
) is given by:
I
BAT_NOAC
= I
BAT
+ I
VCC2_AC0
+ I
SAFETY1
+ I
SAFETY2
+
I
SMB
+ I
SMB_BAT1_AC0
+ I
SMB_BAT2_AC0
+ I
SMBALERT
where:
I
BAT
is defined in “Electrical Characteristics”.
I
VCC2_AC0
is defined in “Electrical Characteristics”.
I
SAFETYX
is the current used to test the battery
thermistor connected to SAFETY1 or SAFETY2.
I
SAFETYX
= 2/64 V
VCC2
/(RXB + R
THX
).
R
THX
is the impedance of the battery’s thermistor to
ground.
RXB = 54.9k.
Sample calculation of I
SAFETY
with V
VCC2
= 5.2V
Thermistor Impedance
R
THX
(
)
400
Thermistor Range
I
SAFETYX
(
μ
A)
UNDER_RANGE
2.9
I
SMB_BATX_ACO
is the current used for communicat-
ing with Battery1 or Battery2 when AC in not present.
I
SMB_BATX_AC0
= 350
μ
A 0.00687 = 2.404
μ
A.
I
SMB
is the current used for communicating with the
SMBus Host and depends on the amount of bus
traffic.
Sample calculation with two Li-Ion batteries (R
THX
=
400), V
CC2
= 5.2V, and no SMBus Host communication:
I
BAT_NOAC
– I
BAT
+ I
VCC2_AC0
+ I
SAFETY1
+ I
SAFETY2
+
I
SMB
+ I
SMB_BAT1_AC0
+ I
SMB_BAT2_AC0
+ I
SMBALERT
= 175
μ
A + 80
μ
A + 2.9
μ
A + 2.9
μ
A + 0
μ
A + 2.4
μ
A +
2.4
μ
A + 0
μ
A = 265
μ
A
Calculating IC Power Dissipation
The power dissipation of the LTC1760 is dependent upon
the gate charge of Q
TG
and Q
BG
.(Refer to Typical
Application). The gate charge is determined from the
manufacturer’s data sheet and is dependent upon both the
gate voltage swing and the drain voltage swing of the FET.
P
D
= (V
DCIN
– V
VCC
) f
OSC
(Q
TG
+ Q
BG
) + V
DCIN
I
DCIN_CHG
– V
VCC
(I
SAFETY1
+ I
SAFETY2
)
where:
I
DCIN_CHG
, I
SAFETY1
, I
SAFETY2
are defined in the
previous section.
Example:
V
VCC
= 5.2V, V
DCIN
= 19V, f
OSC
= 345kHz, Q
TG
=
Q
BG
= 15nC, I
DCIN_CHG
= 2.62mA, I
SAFETY1
=
I
SAFETY2
= 218
μ
A.
P
D
= 190mW
V
SET
/I
SET
Capacitors
Capacitor C7 is used to filter the delta-sigma modulation
frequency components to a level which is essentially DC.
Acceptable voltage ripple at ISET is about 10mV
P-P
. Since
the period of the delta-sigma switch closure, T
Σ
, is about
10
μ
s and the internal IDAC resistor, R
SET
, is 18.77k, the
ripple voltage can be approximated by:
C
V
V
R
T
7
ISET
REF
SET
=
∑
APPLICATIOU
W
U
U
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相關代理商/技術參數(shù)
參數(shù)描述
LTC1760CFW 功能描述:IC MANAGER BATTERY DUAL 48TSSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- 功能:電池監(jiān)控器 電池化學: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 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 供應商設備封裝:SOT-6 包裝:帶卷 (TR)
LTC1760CFW#PBF 功能描述:IC MANAGER BATTERY DUAL 48TSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 其它有關文件:STC3100 View All Specifications 特色產(chǎn)品:STC3100 - Battery Monitor IC 標準包裝:4,000 系列:- 功能:燃料，電量檢測計/監(jiān)控器 電池化學: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） 供應商設備封裝:8-MiniSO 包裝:帶卷 (TR) 其它名稱:497-10526-2
LTC1760CFW#PBF 制造商:Linear Technology 功能描述:Battery Management IC 制造商:Linear Technology 功能描述:IC, BATTERY CHARGER, 4.28A, TSSOP-48
LTC1760CFW#TR 功能描述:IC MANAGER BATTERY SYS 48-TSSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- 功能:電池監(jiān)控器 電池化學: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 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 供應商設備封裝:SOT-6 包裝:帶卷 (TR)
LTC1760CFW#TRPBF 功能描述:IC MANAGER BATTERY DUAL 48TSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- 功能:電池監(jiān)控器 電池化學: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 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 供應商設備封裝:SOT-6 包裝:帶卷 (TR)
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