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| LTC3417A-2 Datasheet, PDF (17/20 Pages) Linear Technology – Dual Synchronous 1.5A/1A 4MHz Step-Down DC/DC Regulator | |||
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APPLICATIONS INFORMATION
LTC3417A-2
VIN
2.25V TO 5.5V
CIN
10μF
CIN1
0.1μF
CIN2
R7
0.1μF 100k
VOUT1
1.8V
1.5A
COUT1
47μF
C1 22pF
R1 511k
L1
1.5μH
VIN
R2
412k
R5
5.9k
C3
2200pF
VIN1 VIN2
SYNC/MODE PGOOD
SW1
SW2
RUN1
RUN2
LTC3417A-2
VFB1
PHASE
VFB2
FREQ
ITH1
ITH2
EXPOSED
GNDA PAD GNDD
L2
2.2μH
VIN
C2 22pF
R3 866k
VIN
R4
412k
R6
2.87k
C4
6800pF
3417A-2 F04
L1: MIDCOM DUS-5121-1R5R
COUT1: KEMET C1210C226K8PAC
L2: MIDCOM DUS-5121-2R2R
COUT2, CIN: KEMET C1206C106K4PAC
VOUT2
2.5V
1A
COUT2
22μF
OUT1 Efï¬ciency vs Load Current
100
10
VIN = 3.6V
VOUT = 1.8V
95 FREQ = 1MHz
REFER TO FIGURE 4
1
90
EFFICIENCY
85
0.1
80
POWER LOSS
0.01
75
70
0.001
0.01
0.1
1
LOAD CURRENT (A)
0.001
10
3417A-2 F04a
Figure 4. 1.8V at 1.5A/2.5V at 1A Step-Down Regulators
3417a2fa
17
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