LTC3446
20
3446ff
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com
LINEAR TECHNOLOGY CORPORATION 2006
LT 0511 REV F • PRINTED IN USA
relaTeD parTs
Typical applicaTion
PART NUMBER DESCRIPTION COMMENTS
LT3023 Dual, 2x100mA,
Low Noise Micropower LDO
V
IN
: 1.8V to 20V, V
OUT(MIN)
= 1.22V, V
DO
= 0.30V, I
Q
= 40µA, I
SD
< 1µA,
V
OUT
= ADJ, DFN, MS Packages, Low Noise < 20µV
RMS(P-P)
, Stable with
1µF Ceramic Capacitors
LT3024 Dual, 100mA/500mA,
Low Noise Micropower LDO
V
IN
: 1.8V to 20V, V
OUT(MIN)
= 1.22V, V
DO
= 0.30V, I
Q
= 60µA, I
SD
< 1µA,
V
OUT
= ADJ, DFN, TSSOP Packages, Low Noise < 20µV
RMS(P-P)
, Stable with
1µF Ceramic Capacitors
LTC3025 300mA, Micropower VLDO
Linear Regulator
V
IN
: 0.9V to 5.5V, V
OUT(MIN)
= 0.4V, 2.7V to 5.5V Bias Voltage Required,
V
DO
= 45mV, I
Q
= 50µA, I
SD
< 1µA, V
OUT
= ADJ, DFN Packages, Stable with
1µF Ceramic Capacitors
LTC3407 Dual Synchronous 600mA
Synchronous Step-Down DC/DC Regulator
1.5MHz Constant Frequency Current Mode Operation, V
IN
from 2.5V to
5.5V, V
OUT
Down to 0.6V, DFN, MS Packages
LTC3407-2 Dual Synchronous 800mA Synchronous
Step-Down DC/DC Regulator, 2.25MHz
2.25MHz Constant Frequency Current Mode Operation, V
IN
from 2.5V to
5.5V, V
OUT
Down to 0.6V, DFN, MS Packages
LTC3445 I
2
C Controllable Buck Regulator
with Two LDOs and and
Backup Battery Input
600mA, 1.5MHz Current Mode Buck Regulator, I
2
C Programmable V
OUT
from 0.85V to 1.55V, two 50mA LDOs, Backup Battery Input with
PowerPath™ Control, QFN Package
LTC3555 High Efficiency USB Power Manager Plus
Triple Step-Down DC/DC
Maximizes Available Power from USB Port, Bat-Track™, “Instant On” Operation,
1.5A Maximum Charge Current, 180mΩ Ideal Diode with <50Ω Option, 3.3V/25mA
Always-On LDO, Three Synchronous Buck Regulators
(400mA/400mA/1A), 4mm × 5mm QFN28 Package
LTC3557 USB Power Manager with Li-Ion/Polymer
Charger and Triple Synchrounous
Buck Converter
Complete Multifunction ASSP: Linear Power Manager and Three Buck Regulators,
Charge Current Programmable Up to 1.5A from Wall Adapter Input,
Thermal Regulation, Synchronous Buck Efficiency: >95%, ADJ Outputs: 0.8V to 3.6V
at 400mA/400mA/600mA, Bat-Track Adaptive Output Control,
200mΩ Ideal Diode, 4mm × 4mm QFN28 Package
LTC3559 Linear USB Li-Ion Battery Charger with
Dual Buck Regulators
Charge Current Programmable Up to 950mA, USB Compatible, Dual Synchronous
400mA Buck Regulators, Efficiency >90%, 3mm × 3mm QFN16 Package
LTC3672B-1/
LTC3672B-2
Fixed-Output Monolithic 400mA Buck
Regulator with Dual 150mA LDOs in
a 2mm × 2mm DFN
>90% Efficiency, V
IN
: 2.9V to 5.5V, I
Q
= 260µA,
LTC3672B-1: Buck = 1.8V, LDO1 = 1.2V, LDO2 = 2.8V
LTC3672B-2: Buck = 1.2V, LDO1 = 2.8V, LDO2 = 1.8V
Consult LTC Factory for Other Voltage Combinations
LTC3700 Step-Down DC/DC Controller with
LDO Regulator
V
IN
from 2.65V to 9.8V, Constant Frequency 550kHz Operation
V
IN
59k
L1
1.8µH
47.5k
SW
BUCKFB
LV
IN
LTC3446
GND
22µF
X7R
1000pF
DIGITAL
CONTROL
22µF
X7R
V
OUT
1.8V
400mA MAX
110k
40.2k
2.2µF
X7R
V
OUT
1.5V
300mA MAX
V
IN
2.9V TO 5.5V
LV
OUT1
PGOOD
MODESEL
ENBUCK
ENLDO1
ENLDO2
LV
FB1
80.6k
40.2k
2.2µF
X7R
L1: TOKO A960AW-1R8M
3446 TA02
V
OUT
1.2V
300mA MAX
LV
OUT2
3.3k
I
TH
LV
FB2
