LTC3559-1_15 Datasheet, PDF (23/24 Pages) Linear Technology – Linear USB Battery Charger with Dual Buck Regulators

LTC3559/LTC3559-1
TYPICAL APPLICATIONS
The Battery Can be Charged with Up to 950mA of Charge Current. Buck Regulator 2 Is Enabled Only After V_OUT1 Is Up to Approximately
0.7V. This Provides a Sequencing Function Which May Be Desirable in Applications Where a Microprocessor Needs to Be Powered Up
Before Peripherals. CHRG Interfaces to a Microprocessor Which Decodes the Battery Charger State
ADAPTER
4.5V TO 5.5V
100k
TO
MICROPROCESSOR
100k
V_CC
1μF
NTC
100k
NTC
NTH50603NO1
LTC3559/
LTC3559-1
887Ω
CHRG
PROG
SUSP
UP TO
950mA
BAT
PV_IN
+
2.2μF
4.7μH
SW1
655k
FB1
309k
SINGLE
Li-lon CELL
2.7V TO 4.2V (LTC3559)
2.7V TO 4.1V (LTC3559-1)
22pF
10μF
2.5V AT
400mA
DIGITALLY
CONTROLLED
HPWR
MODE
SW2
EN1
FB2
EN2
GND EXPOSED PAD
4.7μH
324k
22pF
649k
1.2V AT
400mA
10μF
3559 TA02
PACKAGE DESCRIPTION
UD Package
16-Lead Plastic QFN (3mm × 3mm)
(Reference LTC DWG # 05-08-1691)
3.50 p 0.05
1.45 p 0.05
2.10 p 0.05 ^{(4 SIDES)}
0.70 p0.05
3.00 p 0.10
(4 SIDES)
PIN 1
TOP MARK
(NOTE 6)
0.75 p 0.05
BOTTOM VIEW—EXPOSED PAD
R = 0.115
TYP
15 16
PIN 1 NOTCH R = 0.20 TYP
OR 0.25 s 45o CHAMFER
0.40 p 0.10
1
1.45 p 0.10
2
(4-SIDES)
PACKAGE
OUTLINE
0.25 p0.05
0.50 BSC
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
NOTE:
1. DRAWING CONFORMS TO JEDEC PACKAGE OUTLINE MO-220 VARIATION (WEED-2)
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
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
0.200 REF
0.00 – 0.05
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 representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
(UD16) QFN 0904
0.25 p 0.05
0.50 BSC
3559fb
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