LTC3446 Datasheet, PDF (20/20 Pages) Linear Technology – Monolithic Buck Regulator with Dual VLDO Regulators

LTC3446
TYPICAL APPLICATION
V_IN
2.9V TO 5.5V _22μF
X7R
DIGITAL
CONTROL
V_IN
SW
BUCKFB
LTC3446
LV_IN
PGOOD LV_OUT1
MODESEL
ENBUCK
ENLDO1 LVFB1
ENLDO2
1000pF
3.3k
I_TH
LV_OUT2
LV_FB2
GND
3446 TA01
L1
1.8μH
59k
47.5k
110k
40.2k
80.6k
40.2k
V_OUT
1.8V
22μF _{400mA MAX}
X7R
2.2μF
X7R
V_OUT
1.5V
300mA MAX
2.2μF
X7R
V_OUT
1.2V
300mA MAX
L1: TOKO A960AW-1R8M
RELATED PARTS
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
LTC3407-2
LTC3445
Dual Synchronous 600mA
Synchronous Step-Down DC/DC Regulator
Dual Synchronous 800mA Synchronous
Step-Down DC/DC Regulator, 2.25MHz
I²C Controllable Buck Regulator
with Two LDOs and and
Backup Battery Input
1.5MHz Constant Frequency Current Mode Operation, V_IN from 2.5V to
5.5V, V_OUT Down to 0.6V, DFN, MS Packages
2.25MHz Constant Frequency Current Mode Operation, V_IN from 2.5V to
5.5V, V_OUT Down to 0.6V, DFN, MS Packages
600mA, 1.5MHz Current Mode Buck Regulator, I²C 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
PowerPath and Bat-Track is a trademark of Linear Technology Corporation.
3446fd
20 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ^● FAX: [phone] ^● www.linear.com
LT 0108 REV D • PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 2006