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參數(shù)資料
| 型號： | LTC3407EDD-2 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Dual Synchronous, 800mA, 2.25MHz Step-Down DC/DC Regulator |
| 中文描述： | 1.6 A DUAL SWITCHING CONTROLLER, 2700 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | 3 X 3 MM, PLASTIC, M0-229WEED-2, DFN-10 |
| 文件頁數(shù)： | 20/24頁 |
| 文件大?。?/td> | 516K |
| 代理商： | LTC3407EDD-2 |
LTC3455
20
3455f
V
USB
(V)
3.75
0
C
100
200
300
400
500
4.00
4.25
4.50
4.75
3455 F12
5.00
5.25
I
BAT
USB HIGH POWER MODE
V
BAT
= 3.6V
TOTAL SYSTEM CURRENT (mA)
0
0
C
100
–100
200
300
400
500
100
200
300
400
3455 F11
500
600
USB HIGH POWER MODE
V
USB
= 5V
V
BAT
= 3.6V
I
BAT
I
USB
APPLICATIU
Battery Charger Thermal Limit
An internal thermal limit reduces the charge current if the
die temperature attempts to rise above approximately
105
°
C. This protects the LTC3455 from excessive tem-
perature, and allows the user to push the limits of the
power handling capability of a given circuit board without
risk of damaging the LTC3455. Another benefit of the
thermal limit is that charge current can be set according to
typical, not worst-case, ambient temperatures for a given
application with the assurance that the charger will auto-
matically reduce the current under worst-case conditions.
W
U
U
CHRG Status Output
The CHRG pin is pulled low with an internal N-channel
MOSFET whenever the battery charger is enabled, and is
forced into a high impedance state whenever it is disabled.
This NMOS device is capable of driving an external LED.
This pin does not provide any C/10 information.
Special Charger Features while USB Powered
The LTC3455 has several special features that help make
the most of the power available from the USB power
supply. The internal USB power controller automatically
throttles back the battery charge current to help keep the
total system current under the strict 500mA/100mA USB
limit. The graph in Figure 11 shows how charge current,
I
BAT
, decreases as the current needed for the rest of the
system increases (both switchers and all other external
devices pull current from the V
MAX
pin). The total USB
current, I
USB
, always stays below 500mA.
Figure 11. Charge Current vs Total System Current
Figure 12. Charge Current vs USB Voltage
As the USB voltage drops below 4.5V, the charge current
gradually reduces (and eventually shuts off around 4V).
This helps prevent “chattering” and stability problems
when using long, resistive USB cables. Figure 12 shows
this reduction in charge current.
Because the charge current can vary dramatically when
the LTC3455 is USB powered, battery charging can take
considerably longer using the USB supply (as compared
to a wall adapter).
Constant-Current-Only Charger/Disabling the
ChargerTimer
To use the charger in a constant-current-only mode,
connect the TIMER pin to V
MAX
to disable the timer,
voltage amplifier, and trickle charge function. To disable
only the timer function and leave all others intact, connect
the TIMER pin to GND. Since the charge cycle is termi-
nated only by the charge timer, external charge termina-
tion is required when using either of these methods. Use
an external NMOS to float the PROG pin and disable
charging.
Constant-current-only mode is a good choice for systems
that are always powered by a USB supply or wall adapter,
and the charger can be used to charge a super-cap or
backup battery. Disabling the voltage amplifier allows the
super-cap/backup battery to charge up fully to the avail-
able USB or wall adapter voltage.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC3407EDD-2#PBF | 功能描述:IC REG BUCK SYNC ADJ 1A DL 10DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V，1.5V，1.8V，2.5V 輸入電壓:2.7 V ~ 20 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:50mA 同步整流器:是 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬）裸露焊盤 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:10-MSOP 裸露焊盤 |
| LTC3407EDD-2#TR | 功能描述:IC REG BUCK SYNC ADJ 1A DL 10DFN RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V，1.5V，1.8V，2.5V 輸入電壓:2.7 V ~ 20 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:50mA 同步整流器:是 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬）裸露焊盤 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:10-MSOP 裸露焊盤 |
| LTC3407EDD-2#TRPBF | 功能描述:IC REG BUCK SYNC ADJ 1A DL 10DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V，1.5V，1.8V，2.5V 輸入電壓:2.7 V ~ 20 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:50mA 同步整流器:是 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬）裸露焊盤 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:10-MSOP 裸露焊盤 |
| LTC3407EDD-2PBF | 制造商:Linear Technology 功能描述:Conv DC-DC Dual Step-Down 2.5-5.5V DFN10 |
| LTC3407EDD-3 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Dual Synchronous, 1.8V/0.8A and 3.3V/0.8A 2.25MHz Step-Down DC/DC Regulator |
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