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參數(shù)資料
| 型號(hào)： | LTC3456 |
| 廠商： | Linear Technology Corporation |
| 元件分類(lèi)： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | 2-Cell, Multi-Output DC/DC Converter with USB Power Manager |
| 中文描述： | 2節(jié)電池，多輸出DC / DC轉(zhuǎn)換器與USB電源管理器 |
| 文件頁(yè)數(shù)： | 23/28頁(yè) |
| 文件大小： | 358K |
| 代理商： | LTC3456 |
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23
LTC3456
3456f
APPLICATIU
W
U
U
The QFN package has an exposed paddle and it must be
connected to the system ground. The ground connection
for the feedback resistors should be tied directly to the
ground plane and not shared with any other component,
ensuring a clean, noise-free connection.
DESIGN EXAMPLE
As a design example, we target a 2 AA cell powered GPS
navigator application. Figure 17 shows LTC3456 being
used to provide power to the core and I/O peripherals. The
flash memory card is powered from the Hot Swap output.
Core output needs to be 1.8V and the maximum load
current is 200mA. The inductor current ripple,
I
L
, for
buck mode of operation is given by:
=
(
)
I
V
V
( )
V
1
V
f L
L
OUT
IN
OUT
IN
1
–
The maximum inductor current in L1 is set by the core
converter current limit; i.e., 400mA (minimum). Choosing
I
L
= 100mA (~25% of peak inductor current) is a reason-
able starting value.
Substituting V
OUT
= 1.8V, V
IN(MAX)
= 3.2V,
I
L1
= 100mA,
f = 1MHz in above equation gives:
L
V
V
V
V
mA
MHz
1
H
1
1 8
3 2
.
3 2
100
7 8
.
=
(
)
=
μ
.
.
–1 8
We can choose a low resistance 7.8
μ
H or slightly higher
value inductor. We can choose a 450mA, 10
μ
H inductor
(Murata LQH32CN100).
We need to check the ripple current when the core output
is powered from the AC adapter or the USB. L1 is used to
power the output in this case too.
+
WALLFB
PWRKEY
PBSTAT RESET MODE
V
MAX
V
EXT
10
μ
F
4.7
μ
F
4.7
μ
F
1k
11.3k
1
4.7
μ
F
1
AC
ADAPTER
(5V
±
10%)
USB POWER
(4.35V TO 5.5V)
USB
CONTROLLER
4.32k
80.6k
100k
L2
4.7
μ
H
2 AA
CELLS
L3
10
μ
H
EXT_PWR
USB
SUSPEND
USBHP
AO
AIN
V
MAIN
V
BATT
V
INT
SW2_BST
LTC3456
BOLD LINES INDICATE HIGH CURRENT PATHS
SW2_BK
μ
P
PWRON PGND AGND
22
μ
F
V
3.3V
MAIN OUTPUT
3.3V
150mA
1
μ
F
HSO
Hot Swap OUTPUT
3.3V
50mA
1
μ
F
1
μ
F
3456 TA01
SW1
FB1
L1
10
μ
H
CORE OUTPUT
1.8V
200mA
V
(POWERS
REAL-TIME CLOCK)
10
μ
F
220pF
100k
80.6k
Figure 16. Layout Diagram
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC3456EUF | 制造商:Linear Technology 功能描述:Power Management System 24-Pin QFN EP |
| LTC3456EUF#PBF | 功能描述:IC CONV DC/DC USB BATT 24-QFN RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 電源管理 - 專(zhuān)用 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 應(yīng)用:手持/移動(dòng)設(shè)備 電流 - 電源:- 電源電壓:3 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:14-WFDFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:14-LLP-EP（4x4） 包裝:Digi-Reel® 配用:LP3905SD-30EV-ND - BOARD EVALUATION LP3905SD-30 其它名稱:LP3905SD-30DKR |
| LTC3456EUF#TRPBF | 功能描述:IC CONV DC/DC USB BATT 24-QFN RoHS:否 類(lèi)別:集成電路 (IC) >> PMIC - 電源管理 - 專(zhuān)用 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 應(yīng)用:手持/移動(dòng)設(shè)備 電流 - 電源:- 電源電壓:3 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:14-WFDFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:14-LLP-EP（4x4） 包裝:Digi-Reel® 配用:LP3905SD-30EV-ND - BOARD EVALUATION LP3905SD-30 其它名稱:LP3905SD-30DKR |
| LTC3458 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:1.7A, 1.5MHz Synchronous Step-Up DC/DC Converter with Output Disconnect |
| LTC3458EDE | 功能描述:IC REG BOOST SYNC ADJ 1.4A 12DFN RoHS:否 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類(lèi)型:降壓（降壓） 輸出類(lèi)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(kāi)關(guān):- 電流 - 輸出:50mA 同步整流器:是 工作溫度:-40°C ~ 125°C 安裝類(lèi)型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬）裸露焊盤(pán) 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:10-MSOP 裸露焊盤(pán) |
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