LTC3417 Datasheet, PDF (17/20 Pages) Linear Technology – Dual Synchronous 1.4A/800mA 4MHz Step-Down DC/DC Regulator

APPLICATIO S I FOR ATIO
LTC3417
V_IN
2.25V TO 5.5V
C_IN
10µF
C_IN1
0.1µF
C_IN2
R7
0.1µF 100k
V_OUT1
1.8V
1.4A
C_OUT1
22µF
C1 22pF
L1
1.5µH
V_IN
R1 511k
R2
412k
R5
5.9k
C3
2200pF
V_IN1 V_IN2
MODE
PGOOD
SW1
SW2
RUN1
RUN2
LTC3417
V_FB1
PHASE
V_FB2
FREQ
I_TH1
I_TH2
EXPOSED
GNDA PAD GNDD
L2
2.2µH
V_IN
C2 22pF
R3 866k
V_IN
R4
412k
R6
2.87k
C4
6800pF
3417 F04
L1: MIDCOM DUS-5121-1R5R
C_OUT1: KEMET C1210C226K8PAC
L2: MIDCOM DUS-5121-2R2R
C_OUT2, C_IN: KEMET C1206C106K4PAC
V_OUT2
2.5V
800mA
C_OUT2
10µF
OUT1 Efficiency vs Load Current
100
10
V_IN = 3.6V
V_OUT = 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
3417fb
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