LTC3441 Linear Technology, LTC3441 Datasheet - Page 23

• Manufacturer Part Number: LTC3441
• Description: Dual DC/DC Converter with USB Power Manager and Li-Ion Battery Charger
• Manufacturer: Linear Technology

PACKAGE DESCRIPTIO
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.
TYPICAL APPLICATIO S
4.50 0.05
3.10 0.05
2.45 0.05
(4 SIDES)
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
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
5. EXPOSED PAD SHALL BE SOLDER PLATED
6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION
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.
MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE, IF PRESENT
ON THE TOP AND BOTTOM OF PACKAGE
U
PIN 1
TOP MARK
(NOTE 6)
U
4.00 0.10
(4 SIDES)
24-Lead Plastic QFN (4mm 4mm)
(Reference LTC DWG # 05-08-1697)
0.50 BSC
0.25 0.05
0.70 0.05
UF Package
PACKAGE OUTLINE
0.75 0.05
0.5A TO 1.2A STEP
Figure 16. Load Current Step (0.5A to 1.2A) for 3.3V Output
AC COUPLED
V
OUT2
100mV/DIV
M1 GATE
0.5A/DIV
0.200 REF
0.00 – 0.05
2V/DIV
2.45 0.10
(3.3V)
(4-SIDES)
I
OUT2
R = 0.115
BOTTOM VIEW—EXPOSED PAD
TYP
500 s/DIV
23
24
(4 SIDES)
0.23 TYP
0.50 BSC
0.25 0.05
LTC3455
1
2
(UF24) QFN 1103
0.38 0.10
3455 F16
23
3455f