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| LTC3417_15 Datasheet, PDF (17/20 Pages) Linear Technology – Dual Synchronous 1.4A/800mA 4MHz Step-Down DC/DC Regulator | |||
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APPLICATIONS INFORMATION
VIN
2.25V TO 5.5V
CIN
10μF
CIN1
0.1μF
CIN2
0.1μF
R7
100k
VOUT1
1.8V
1.4A
COUT1
22μF
L1
1.5μH
C1 22pF
VIN
R1 511k
R2
412k
R5
5.9k
C3
2200pF
VIN1 VIN2
MODE
PGOOD
SW1
SW2
RUN1
RUN2
LTC3417
VFB1
PHASE
VFB2
FREQ
ITH1
ITH2
EXPOSED
GNDA PAD GNDD
L2
2.2μH
C2 22pF
VIN
R3 866k
VIN
R4
412k
R6
2.87k
C4
6800pF
3417 F04
VOUT2
2.5V
800mA
COUT2
10μF
L1: MIDCOM DUS-5121-1R5R
COUT1: KEMET C1210C226K8PAC
L2: MIDCOM DUS-5121-2R2R
COUT2, CIN: KEMET C1206C106K4PAC
LTC3417
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
3417 F04a
Figure 4. 1.8V at 1.4A/2.5V at 800mA Step-Down Regulators
3417fd
17
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