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參數(shù)資料
| 型號： | LTC1559-5 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Backup Battery Controller with Fixed Output(帶固定輸出后備電池控制器) |
| 中文描述： | 備用電池控制器（帶固定輸出后備電池控制器具有固定輸出） |
| 文件頁數(shù)： | 10/20頁 |
| 文件大?。?/td> | 290K |
| 代理商： | LTC1559-5 |
10
LTC1559-3.3/LTC1559-5
If V
CC
is still less than
V
CC
(rated value) –7% (LTC1559-
3.3)
after the first boost cycle, the LTC1559 immediately
reconnects SW to ground, repeating the boost cycle. If
after two consecutive pulses, V
CC
is still not above the
boost threshold
V
CC
(rated value) –7% (LTC1559-3.3)
,
the LTC1559 decides that the load is not so light after all,
and doubles the internal inductor charging current limit to
330mA for subsequent cycles. This is high current mode.
By doubling the peak inductor current, each boost cycle
effectively carries four times more energy compared to
low current mode (E = 1/2 LI
2
), doubling the available
output power. When V
CC
exceeds the
V
CC
(rated value)
–7% (LTC1559-3.3)
boost threshold, the LTC1559 stops
the boost converter and resets the internal 2-pulse counter.
The next time V
CC
falls below
V
CC
(rated value) –7%
(LTC1559-3.3)
, the boost converter restarts in low current
mode for at least two boost cycles. Moderate or changing
loads cause the LTC1559 to shift between the two peak
inductor current limits, keeping the output in tight regula-
tion. Near its maximum load capability, the LTC1559 will
stay in 330mA high current mode and the output voltage
V
BAK
will hover around
V
CC
(rated value) –7%
(LTC1559-3.3)
.
V
CC
Capacitor ESR
The type of output capacitor and the rated V
CC
value will
affect the LTC1559’s output ripple and efficiency. In most
applications, the V
CC
capacitor is primarily determined by
the requirements of the main power supply. Such a
capacitor will generally meet the requirements of the
LTC1559. In unusual circumstances or circuits where
the main system V
CC
capacitor is located some distance
away from the LTC1559, a local output capacitor may be
necessary.
The ripple on the V
CC
pin is equal to the capacitor ESR
voltage drop due to the boost converter’s output current
pulses. The ripple frequency and output duty cycle is
proportional to the inductor discharge time. Given a fixed
inductor value (22
μ
H) and a known peak current limit, the
booster’s discharge time in each boost cycle is propor-
tional to the difference between V
BAK
(93% of the rated V
CC
for the LTC1559-3.3 and 92.5% of the rated V
CC
for the
LTC1559-5) and the battery cell voltage, V
BAT
(1.2V).
APPLICATIO
S I
N
FOR
ATIO
U
W
U
Assuming ESR = 0.2
, I
IND(PEAK)
= 330mA, V
CC
= 5V,
V
RIPPLE(P-P)
= (I
IND(PEAK)
)(R
ESR(CAP)
)
= (330mA)(0.2
)
= 66mV
Since V
CC
must be scaled down internally, the external
resistor ratio:
= 5V/1.272V
= 3.931
Therefore the ripple seen by the V
CC
comparators is:
= 66mV/3.931
= 16.79mV
The discharge time period,
t
DISCH
= (L I
IND(PEAK)
)/(V
BAK
– V
BAT
)
= (22
μ
H 330mA)/(4.625 – 1.2V)
= 2.12
μ
s
For V
CC
= 3.3V and I
IND(PEAK)
= 330mA,
V
RIPPLE(P-P)
= 66mV
RB resistor ratio = 3.3/1.272 = 2.594
Ripple voltage = 25.4mV
t
DISCH
= 3.9
μ
s
The internal V
CC
comparators are designed to have a slow
response time to filter away this ripple. The V
CC
(rated
value) – 5.5% (LTC1559-3.3) and V
CC
(rated value) – 9%
comparators have a 6
μ
s rising edge delay and 2
μ
s falling
edge delay. The V
CC
(rated value) – 7% (LTC1559-3.3)
comparator has a similar 6
μ
s rising time delay but a much
longer falling time delay of 20
μ
s. This enables the com-
parator to control the boost converter properly, and avoids
turning off the boost converter prematurely due to false
triggering by the ESR ripple.
Exit from Backup
When a main battery is inserted into the system, the
LTC1559 follows a specific sequence to exit backup mode
and return control to the main supply. The sequence
depends on the type of main power supply used. In
systems where the main supply’s output impedance is
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| LTC1559CGN-3.3 | 功能描述:IC BACKUP BATT CNTRLR3.3V 16SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標(biāo)準(zhǔn)包裝:2,000 系列:Impedance Track™ 功能:燃料，電量檢測計/監(jiān)控器 電池化學(xué):鋰離子（Li-Ion） 電源電壓:2.4 V ~ 2.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:20-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:20-TSSOP 包裝:帶卷 (TR) 產(chǎn)品目錄頁面:1020 (CN2011-ZH PDF) 配用:BQ27350EVM-ND - BQ27350EVM 其它名稱:296-21665-2 |
| LTC1559CGN-3.3#PBF | 功能描述:IC BACKUP BATT CNTRLR3.3V 16SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 功能:充電管理 電池化學(xué):鋰離子（Li-Ion）、鋰聚合物（Li-Pol） 電源電壓:3.75 V ~ 6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SC-74A，SOT-753 供應(yīng)商設(shè)備封裝:SOT-23-5 包裝:剪切帶 (CT) 產(chǎn)品目錄頁面:669 (CN2011-ZH PDF) 其它名稱:MCP73831T-2ACI/OTCT |
| LTC1559CGN-3.3#TRPBF | 功能描述:IC BACKUP BATT CNTRLR3.3V 16SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 功能:充電管理 電池化學(xué):鋰離子（Li-Ion）、鋰聚合物（Li-Pol） 電源電壓:3.75 V ~ 6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SC-74A，SOT-753 供應(yīng)商設(shè)備封裝:SOT-23-5 包裝:剪切帶 (CT) 產(chǎn)品目錄頁面:669 (CN2011-ZH PDF) 其它名稱:MCP73831T-2ACI/OTCT |
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