LTC3407-4 Datasheet, PDF (13/16 Pages) Linear Technology – Dual Synchronous, 800mA, 2.25MHz Step-Down DC/DC Regulator

TYPICAL APPLICATIO S
Low Ripple Buck Regulators Using Ceramic Capacitors
V_IN
2.5V TO 5.5V
C1
10µF
V_OUT2
1.8V
800mA
L2
4.7µH
C5, 22pF
RUN2 V_IN RUN1
POR
LTC3407-4
SW2
SW1
R5
100k
POWER-ON
RESET
L1
4.7µH
C4, 22pF
V_OUT1
1.2V
800mA
C3
10µF
R4
887k R3
442k
V_FB2
V_FB1
MODE/SYNC GND
R2
R1 604k
604k
C2
10µF
C1, C2, C3: TAIYO YUDEN JMK316BJ106ML
3407 TA03
L1, L2: SUMIDA CDRH2D18/HP-4R7NC
1mm Height Core Supply
V_IN
3.6V TO 5.5V
C1*
10µF
V_OUT2
3.3V
800mA
L2
2.2µH
C5, 100pF
RUN2 V_IN RUN1
MODE/SYNC
POR
LTC3407-4
SW2
SW1
R5
100k
POWER-ON
RESET
L1
2.2µH
C4, 22pF
V_OUT1
1.8V
800mA
C3
10µF
R4
887k R3
196k
V_FB2
GND
V_FB1
C1, C2, C3: TAIYO YUDEN JMK212BJ106MD-B
L1, L2: COILTRONICS LPO3310-222MX
*IF C1 IS GREATER THAN 3" FROM POWER SOURCE,
ADDITIONAL CAPACITANCE MAY BE REQUIRED.
R2
R1 604k
301k
C2
10µF
3407 TA07
LTC3407-4
Efficiency vs Load Current
100
95
90
V_OUT = 1.8V
85
80
V_OUT = 1.2V
75
70
65
60
V_IN = 3.6V
55 PULSE SKIP MODE
NO LOAD ON OTHER CHANNEL
50
10
100
LOAD CURRENT (mA)
1000
34074 TA03b
Efficiency vs Load Current
100
95
V_OUT = 3.3V
90
85
80
V_OUT = 1.8V
75
70
65
60
V_IN = 5V
55 Burst Mode OPERATION
NO LOAD ON OTHER CHANNEL
50
1
10
100
LOAD CURRENT (mA)
1000
34074 TA08
34074f
13