LTC3548 Datasheet, PDF (16/16 Pages) Linear Technology – Dual Synchronous, 400mA/800mA, 2.25MHz Step-Down DC/DC Regulator

LTC3548
TYPICAL APPLICATIO
2mm Height Lithium-Ion Single Inductor Buck-Boost Regulator and a Buck Regulator
V_OUT2 = 3.3V
AT 100mA
+
C6
22µF
D1
M1
C3
4.7µF
V_IN = 2.8V
TO 4.2V
C1
10µF
L2
15µH
C5, 22pF
RUN2 V_IN RUN1
MODE/SYNC
POR
LTC3548
SW2
SW1
R5
100k
POWER-ON
RESET
L1
2.2µH
C4, 33pF
R4
887k R3
196k
V_FB2
V_FB1
GND
R2
R1 604k
301k
V_OUT1 = 1.8V
AT 800mA
C2
10µF
C1, C2: TAIYO YUDEN JMK316BJ106ML
C3: MURATA GRM21BR60J475KA11B
C6: KEMET C1206C226K9PAC
D1: PHILIPS PMEG2010
Efficiency vs Load Current
90
80
70
4.2V
3.6V
60
2.8V
50
40 V_OUT = 3.3V
Burst Mode OPERATION
NO LOAD ON OTHER CHANNEL
30
1
10
100
LOAD CURRENT (mA)
1000
3548 TA05
L1: MURATA LQH32CN2R2M33
L2: TOKO A914BYW-150M (D52LC SERIES)
M1: SILICONIX Si2302DS
3548 TA04
Efficiency vs Load Current
100
95
2.8V
90
85
4.2V
3.6V
80
75
70
65
V_OUT = 1.8V
Burst Mode OPERATION
NO LOAD ON OTHER CHANNEL
60
1
10
100
LOAD CURRENT (mA)
1000
3548 TA06
RELATED PARTS
PART NUMBER
LTC1878
LT1940
LTC3252
LTC3405/LTC3405A
LTC3406/LTC3406B
LT3407/LT3407-2
LTC3411
LTC3412
LTC3414
LTC3440
DESCRIPTION
600mA (I_OUT), 550kHz,
Synchronous Step-Down DC/DC Converter
Dual Output 1.4A(I_OUT), Constant 1.1MHz,
High Efficiency Step-Down DC/DC Converter
Dual 250mA (I_OUT), 1MHz, Spread Spectrum
Inductorless Step-Down DC/DC Converter
300mA (I_OUT), 1.5MHz,
Synchronous Step-Down DC/DC Converters
600mA (I_OUT), 1.5MHz,
Synchronous Step-Down DC/DC Converters
600mA/1.5MHz, 800mA/2.25MHz
Dual Synchronous Step-Down DC/DC Converter
1.25A (I_OUT), 4MHz,
Synchronous Step Down DC/DC Converter
2.5A (I_OUT), 4MHz,
Synchronous Step Down DC/DC Converter
4A (I_OUT), 4MHz,
Synchronous Step Down DC/DC Converter
600mA (I_OUT), 2MHz,
Synchronous Buck-Boost DC/DC Converter
16 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ^● FAX: [phone] ^● www.linear.com
COMMENTS
95% Efficiency, V_IN: 2.7V to 6V, V_OUT(MIN) = 0.8V, I_Q = 10µA,
I_SD <1µA, MSOP-8 Package
V_IN: 3V to 25V, V_OUT(MIN) = 1.2V, I_Q = 2.5mA, I_SD = <1µA,
TSSOP-16E Package
88% Efficiency, V_IN: 2.7V to 5.5V, V_OUT(MIN) = 0.9V to 1.6V,
I_Q = 60µA, I_SD < 1µA, DFN-12 Package
96% 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
96% Efficiency, V_IN: 2.5V to 5.5V, V_OUT(MIN) = 0.6V, I_Q = 40µA,
I_SD <1µA, MSE, DFN Package
95% Efficiency, V_IN: 2.5V to 5.5V, V_OUT(MIN) = 0.8V, I_Q = 60µA,
I_SD <1µA, MSOP-10 Package
95% Efficiency, V_IN: 2.5V to 5.5V, V_OUT(MIN) = 0.8V, I_Q = 60µA,
I_SD <1µA, TSSOP-16E Package
95% Efficiency, V_IN: 2.25V to 5.5V, V_OUT(MIN) = 0.8V, I_Q = 64µA,
I_SD <1µA, TSSOP-28E Package
95% Efficiency, V_IN: 2.5V to 5.5V, V_OUT(MIN) = 2.5V, I_Q = 25µA,
I_SD <1µA, MSOP-10 Package
3548f
LT/TP 0305 500 • PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 2005