LTC3619B_15 Datasheet, PDF (20/20 Pages) Linear Technology – 400mA/800mA Synchronous Step-Down DC/DC with Average Input Current Limit

LTC3619B
Typical Applications
Dual 400mA/800mA Buck Converter, I_LIM = 500mA
V_IN
3.3V TO 5.5V
C1
10µF
RUN2 V_IN RUN1
V_OUT2
3.3V AT
800mA
+
L2
PGOOD2 PGOOD1
L1
1.5µH
LTC3619B
3.3µH
SW2
SW1
C_F1, 22pF
R4
1150k
C_OUT2
2.2mF
×2
SuperCap
V_FB2
R3 _RLIM
255k
R_LIM
110k
V_FB1
GND
R1 ^R2
255k ^511k
C_LIM
1000pF
V_OUT1
1.8V AT
400mA
C_OUT1
10µF
3619B TA02
C1, C_OUT1: AVX 08056D106KAT2A
C_OUT2: VISHAY 592D228X96R3X2T20H
L1: COILCRAFT LPS4012-332ML
L2: COILCRAFT LPS4012-152ML
Dual 400mA/800mA Buck Converter, I_LIM = 475mA or Disabled
V_IN
3.3V TO 5.5V
C1
10µF
RUN2 V_IN RUN1
V_OUT2
3.3V AT
800mA
+
L2
PGOOD2 PGOOD1
L1
1.5µH
LTC3619B
3.3µH
SW2
SW1
C_F1, 22pF
R4
1150k
C_OUT2
2.2mF
×2
SuperCap
I_LIM
DISABLE
V_FB2
R3 _RLIM
255k
R_LIM
116k
V_FB1
GND
R1 ^R2
255k ^511k
C_LIM
2200pF
V_OUT1
1.8V AT
400mA
C_OUT1
10µF
3619B TA03
C1, C_OUT1: AVX 08056D106KAT2A
C_OUT2: VISHAY 592D228X96R3X2T20H
L1: COILCRAFT LPS4012-332ML
L2: COILCRAFT LPS4012-152ML
Related Parts
PART NUMBER
LTC3619
LTC3127
LTC3125
LTC3417A/
LTC3417A-2
LTC3407A/
LTC3407A-2
LTC3548/LTC3548-1/
LTC3548-2
LTC3546
DESCRIPTION
Dual 400mA and 800mA I_OUT, 2.25MHz,
Synchronous Step-Down DC/DC Converter
1.2A I_OUT, 1.6MHz, Synchronous Buck-Boost DC/DC
Converter with Adjustable Input Current Limit
1.2A I_OUT, 1.6MHz, Synchronous Boost DC/DC
Converter with Adjustable Input Current Limit
Dual 1.5A/1A, 4MHz, Synchronous Step-Down DC/
DC Converter
Dual 600mA/600mA, 1.5MHz, Synchronous
Step-Down DC/DC Converter
Dual 400mA and 800mA I_OUT, 2.25MHz,
Synchronous Step-Down DC/DC Converter
Dual 3A/1A, 4MHz, Synchronous Step-Down
DC/DC Converter
COMMENTS
95% Efficiency, V_IN(MIN) = 2.5V, V_IN(MAX) = 5.5V, V_OUT(MIN) = 0.6V,
I_Q = 50µA, I_SD < 1µA, MS10E, 3mm × 3mm DFN-10
94% Efficiency, V_IN(MIN) = 1.8V, V_IN(MAX) = 5.5V, V_OUT(MAX) = 5.25V,
I_Q = 18µA, I_SD < 1µA, 3mm × 3mm DFN-MSOP10E
94% Efficiency, V_IN(MIN) = 1.8V, V_IN(MAX) = 5.5V, V_OUT(MAX) = 5.25V,
I_Q = 15µA, I_SD < 1µA, 2mm × 3mm DFN-8
95% Efficiency, V_IN(MIN) = 2.3V, V_IN(MAX) = 5.5V, V_OUT(MIN) = 0.8V,
I_Q = 125µA, I_SD = <1µA, TSSOP-16E, 3mm × 5mm DFN-16
95% Efficiency, V_IN(MIN) = 2.5V, V_IN(MAX) = 5.5V, V_OUT(MIN) = 0.6V,
I_Q = 40µA, I_SD = <1µA, MS10E, 3mm × 3mm DFN-10
95% Efficiency, V_IN(MIN) = 2.5V, V_IN(MAX) = 5.5V, V_OUT(MIN) = 0.6V,
I_Q = 40µA, I_SD = <1µA, MS10E, 3mm × 3mm DFN-10
95% Efficiency, V_IN(MIN) = 2.3V, V_IN(MAX) = 5.5V, V_OUT(MIN) = 0.6V,
I_Q = 160µA, I_SD = <1µA, 4mm × 5mm QFN-28
3619bfb
20 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ^● FAX: [phone] ^● www.linear.com
LT 1012 REV B • PRINTED IN USA
 LINEAR TECHNOLOGY CORPORATION 2009