LTC3670_15 Datasheet, PDF (12/12 Pages) Linear Technology – Monolithic 400mA Buck Regulator with Dual 150mA

LTC3670
TYPICAL APPLICATION
LTC3670 with More Output Capacitance for
Improved Transient Response
V_IN
2.5V TO 5.5V
10μF
DIGITAL
CONTROL
V_IN
GND
SW
BUCKFB
LTC3670
ENBUCK
ENLDO1
ENLDO2
PGOOD
LDO1
LDO1_FB
4.7μH
232k
464k
1.00M
806k
LDO2
LDO2_FB
590k
280k
3670 TA02
10pF
V_OUT1
1.2V
10μF ^400mA
V_OUT2
1.8V
4.7μF ^150mA
V_OUT3
2.5V
4.7μF ^150mA
ALL ENABLE ^1V
PINS _0V
Start-Up Transient
OUTPUT
VOLTAGES
500mV/DIV
V_OUT3
V_OUT2
V_OUT1
50μs/DIV
3670 TA03
V_IN = 3.6V Li-Ion CELL, 10mA RESISTIVE LOAD ON EACH OUTPUT
V_OUT1, V_OUT2
AND V_OUT3
LOAD CURRENT
100mA
10mA
Load Transient Response
V_OUT1
50mV/DIV
AC COUPLED
V_OUT2
V_OUT3
20μs/DIV
3670 TA04
V_IN = 3.6V Li-Ion CELL, SIMULTANEOUS LOAD TRANSIENT ALL OUTPUTS
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
LTC3672B-1/
LTC3672B-2
Monolithic Fixed-Output 400mA Buck Regulator with Dual
150mA LDOs in a 2mm × 2mm DFN
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
95% Efficiency, V_IN: 2.9V to 5.5V, I_Q = 260μA,
LTC3672B-1: Buckout = 1.8V, LDO1 = 1.2V, LDO2 = 2.8V
LTC3672B-2: Buckout = 1.2V, LDO1 = 2.8V, LDO2 = 1.8V
3670f
LT 0108 • PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 2008