LTC3124_15 Datasheet, PDF (23/28 Pages) Linear Technology – 15V, 5A 2-Phase Synchronous Step-Up DC/DC Converter with Output Disconnect

TYPICAL APPLICATIONS
Single Li Cell to 6V, 9W, 2.2MHz Synchronous Boost Converter
for RF Transmitter
V_IN
2.7V TO 4.2V
LB
2.2µH
SWB
CAP
LA
2.2µH
PGNDB V_OUTB
SWA
V_OUTA
LTC3124
PGNDA
V_IN
SGND
C_IN
10µF
PWM/SYNC SD
V_CC
FB
RT
V_C
C_VCC
4.7µF _RT
11.5k
C1: 100nF, 16V, X5R, 0805
C_IN: 10µF, 10V, X5R, 1206
C_OUT: 47µF × 2, 16V, X5R, 1210
C_VCC: 4.7µF, 10V, X5R, 1206
LA, LB: WÜRTH WE-PD 7447779002
C1
100nF
C_OUT
47µF
×2
V_OUT
6V
1.5A
OFF ON
R_C
60.4k
C_C
1.2nF
R1
1.13M
R2
280k
C_F
68pF
3124 TA02a
2-Port USB-Powered 1MHz Synchronous Boost Converter to 5V, 500mA
V_IN
4.3V TO 5.5V
C2
10µF
LB
3.3µH
SWB
CAP
LA
3.3µH
PGNDB V_OUTB
SWA
V_OUTA
LTC3124
PGNDA
V_IN
SGND
C_IN
10µF
PWM/SYNC SD
V_CC
FB
RT
V_C
C_VCC
4.7µF _RT
28k
C1: 100nF, 16V, X5R, 0805
C2: KEMET T491C106K025AS
C_IN: 10µF, 10V, X5R, 1206
C_OUT: 100µF × 2, 6.3V, X5R, 1812
C_VCC: 4.7µF, 10V, X5R, 1206
LA, LB: COILCRAFT XAL5030-332ME
C1
100nF
C_OUT
100µF
×2
V_OUT
5V
500mA
OFF ON
R_C
35.7k
C_C
2.7nF
R1
1.47M
R2
464k
C_F
270pF
3124 TA03a
LTC3124
V_OUT
500mV/DIV
AC-COUPLED
OUTPUT
CURRENT
500mA/DIV _150mA
V_IN = 3.6V
Load Step
1.5A
100µs/DIV
150mA
3124 TA02b
50
40
30
20
10
0
–10
–20
–30
–40
–50
100
Bode Plot
120
90
60
PHASE
30
0
GAIN
–30
–60
–90
–120
–150
–180
1k
10k
100k
FREQUENCY (Hz)
3124 TA02c
2-Port USB 2.0 Hot Plugged
V_IN
2V/DIV
V_OUT
2V/DIV
INPUT
CURRENT
500mA/DIV
R_LOAD = 10Ω
2ms/DIV
V_IN = USB 2.0
2-PORT HOT PLUGGED
3124 TA03b
For more information www.linear.com/LTC3124
3124f
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