LTC3672B-1_15 Datasheet, PDF (12/12 Pages) Linear Technology – Monolithic Fixed-Output 400mA Buck Regulator with Dual

LTC3672B-1
TYPICAL APPLICATION
LTC3672B-1 with V_IN1 Tied to V_IN, V_OUT1 Capable of 400mA Even
with V_OUT2 and V_OUT3 Fully Loaded
V_IN
2.9V TO 5.5V
2.2MF
ENABLE
INPUT
V_IN V_{IN1 SW}
GND BUCKOUT
4.7MH
ENALL
LDO1
LTC3672B-1
LDO2
3672b1 TA02
10MF
1MF
1MF
V_OUT1
1.8V
400mA
V_OUT2
1.2V
150mA
V_OUT3
2.8V
UP TO 150mA
(SUBJECT TO DROPOUT
LIMITATIONS)
LTC3672B-1 with V_IN1 Tied to an Independent Supply, V_OUT1
Capable of 400mA Even with V_OUT2 and V_OUT3 Fully Loaded
V_IN
2.9V TO 5.5V
2.2MF
1MF
V_IN1
1.8V TO V_IN
ENABLE
INPUT
V_IN
SW
GND BUCKOUT
LTC3672B-1
V_IN1
LDO1
4.7MH
ENALL
LDO2
3672b1 TA03
10MF
1MF
1MF
V_OUT1
1.8V
400mA
(250mA IF LDO1
FULLY-LOADED)
V_OUT2
1.2V
150mA
V_OUT3
2.8V
UP TO 150mA
(SUBJECT TO DROPOUT
LIMITATIONS)
LTC3672B-1 with V_IN1 Tied to Buckout with More LDO Output Capacitance for Improved Transient Response
V_IN
2.9V TO 5.5V
Load Transient Response
10MF
ENABLE
INPUT
4.7MH
V_IN
SW
GND BUCKOUT
ENALL
V_IN1
LDO1
LTC3672B-1
LDO2
3672b1 TA04
10MF
4.7MF
4.7MF
V_OUT1
1.8V
400mA
(250mA IF LDO1
FULLY-LOADED)
V_OUT2
1.2V
150mA
V_OUT3
2.8V
UP TO 150mA
(SUBJECT TO DROPOUT
LIMITATIONS)
V_OUT2
50mV/DIV
AC-COUPLED
V_OUT3
V_OUT1
V_OUT2 AND V_OUT3
LOAD CURRENT
100mA
10mA
20μs/DIV
3672b1 TA04b
V_IN = 3.6V
SIMULTANEOUS LOAD TRANSIENT ON BOTH LDOs
V_OUT1 FLOATING
RELATED PARTS
PART NUMBER
DESCRIPTION
LTC3405/LTC3405A 300mA I_OUT, 1.5MHz, Synchronous Step-Down DC/DC
Converter
LTC3406/LTC3406B 600mA I_OUT, 1.5MHz, Synchronous Step-Down DC/DC
Converter
LTC3407/LTC3407-2 Dual 600mA/800mA I_OUT, 1.5MHz/2.25MHz, Synchronous
Step-Down DC/DC Converter
LTC3410/LTC3410B 300mA I_OUT, 2.25MHz, Synchronous Step-Down DC/DC
Converter
LTC3411
LTC3445
1.25A I_OUT, 4MHz, Synchronous Step-Down DC/DC
Converter
I²C Controllable 600mA Synchronous Buck Regulator with
Two 50mA LDOs in a 4mm × 4mm QFN
LTC3446
Synchronous 1A, 2.25MHz Step-Down DC/DC Regulator
with Dual VLDOs
LTC3448
600A I_OUT, 1.5MHz/2.25MHz, Synchronous
Step-Down DC/DC Converter with LDO Mode
LTC3541/LTC3541-1/ Synchronous 500mA, 2.25MHz Step-Down DC/DC
LTC3541-2/LTC3541-3 Regulator with a 300mA VLDO in a 3mm × 3mm DFN
LTC3547
Dual 300mA I_OUT, 2.25MHz, Synchronous Step-Down
DC/DC Converter
LTC3548/LTC3548-1/ Dual 800mA/400mA I_OUT, 2.25MHz, Synchronous Step-
LTC3548-2
Down DC/DC Converter
12 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ^● FAX: [phone] ^● www.linear.com
COMMENTS
95% Efficiency, V_IN: 2.5V to 5.5V, V_OUT(MIN) = 0.8V, I_Q = 20μA,
I_SD <1μA, ThinSOT Package
96% Efficiency, V_IN: 2.5V to 5.5V, V_OUT(MIN) = 0.6V, I_Q = 20μA,
I_SD <1μA, ThinSOT Package
95% Efficiency, V_IN: 2.5V to 5.5V, V_OUT(MIN) = 0.6V, I_Q = 40μA,
I_SD <1μA, MS10E Package
96% Efficiency, V_IN: 2.5V to 5.5V, V_OUT(MIN) = 0.8V, I_Q = 26μA,
I_SD <1μA, SC70 Package
95% Efficiency, V_IN: 2.5V to 5.5V, V_OUT(MIN) = 0.8V, I_Q = 60μA,
I_SD <1μA, MS10 Package
95% Efficiency, V_IN: 2.5V to 5.5V, V_OUT(MIN) = 0.85V, I_Q = 360μA,
I_SD <27μA, 4mm × 4mm QFN Package
95% Efficiency, V_IN: 2.7V to 5.5V, V_OUT(MIN) = 0.4V, I_Q = 140μA,
I_SD <1μA, 3mm × 4mm DFN Package
95% Efficiency, V_IN: 2.5V to 5.5V, V_OUT(MIN) = 0.6V, I_Q = 32μA,
I_SD <1μA, MS10, DFN Packages
95% Efficiency, V_IN: 2.7V to 5.5V, V_OUT(MIN) = 0.4V, I_Q = 85μA,
I_SD <1μA, 3mm × 3mm DFN Package
95% Efficiency, V_IN: 2.5V to 5.5V, V_OUT(MIN) = 0.6V, I_Q = 40μA,
I_SD <1μA, DFN-8 Package
95% Efficiency, V_IN: 2.5V to 5.5V, V_OUT(MIN) = 0.6V, I_Q = 40μA,
I_SD <1μA, MS10, DFN Packages
3672B1f
LT 0607 • PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 2007