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參數(shù)資料
| 型號： | LTC3412 |
| 廠商： | Linear Technology Corporation |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | Dual DC/DC Converter with USB Power Manager and Li-Ion Battery Charger |
| 中文描述： | 雙DC / DC轉(zhuǎn)換器的USB電源管理器和鋰離子電池充電器 |
| 文件頁數(shù)： | 23/24頁 |
| 文件大?。?/td> | 516K |
| 代理商： | LTC3412 |
LTC3455
23
3455f
PACKAGE DESCRIPTIO
U
UF Package
24-Lead Plastic QFN (4mm
×
4mm)
(Reference LTC DWG # 05-08-1697)
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
TYPICAL APPLICATIO S
When the load current exceeds what Switcher 2 can
provide, the 3.3V output droops slightly and the LDO
provides the additional current needed. Figure 16 shows
the transient response when the 3.3V output current is
stepped from 0.5A to 1.2A. More output capacitance can
be added to improve the 3.3V transient response during
these high current load steps.
Figure 16. Load Current Step (0.5A to 1.2A) for 3.3V Output
V
(3.3V)
100mV/DIV
AC COUPLED
500
μ
s/DIV
3455 F16
I
0.5A/DIV
0.5A TO 1.2A STEP
M1 GATE
2V/DIV
4.00
±
0.10
(4 SIDES)
NOTE:
1. DRAWING PROPOSED TO BE MADE A JEDEC PACKAGE OUTLINE MO-220 VARIATION (WGGD-X)—TO BE APPROVED
2. DRAWING NOT TO SCALE
3. ALL DIMENSIONS ARE IN MILLIMETERS
4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE
MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE, IF PRESENT
5. EXPOSED PAD SHALL BE SOLDER PLATED
6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION
ON THE TOP AND BOTTOM OF PACKAGE
PIN 1
TOP MARK
(NOTE 6)
0.38
±
0.10
24
0.23 TYP
(4 SIDES)
23
1
2
BOTTOM VIEW—EXPOSED PAD
2.45
±
0.10
(4-SIDES)
0.75
±
0.05
R = 0.115
TYP
0.25
±
0.05
0.50 BSC
0.200 REF
0.00 – 0.05
(UF24) QFN 1103
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
0.70
±
0.05
0.25
±
0.05
0.50 BSC
2.45
±
0.05
(4 SIDES)
3.10
±
0.05
4.50
±
0.05
PACKAGE OUTLINE
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