Table 1. design examples using ccm – Rainbow Electronics MAX1524 User Manual
Page 12
MAX1522/MAX1523/MAX1524
Simple SOT23 Boost Controllers
12
______________________________________________________________________________________
PARAMETER
EXAMPLE 1
EXAMPLE 2
EXAMPLE 3
V
IN
3.3V
±
10%
2.7V to 4.2V
1.8V to 3.0V
V
OUT
5V
12V
5V
I
OUT(MAX)
700mA
200mA
1.0A
R1, R2
274k
Ω
, 90.9k
Ω
866k
Ω
, 100k
Ω
274k
Ω
, 90.9k
Ω
Duty Cycle (max)
45.5%
78.4%
67.3%
t
ON
0.5µs (SET = GND)
3µs (SET = V
CC
)
3µs (SET = V
CC
)
f
SWITCHING
691kHz to 909kHz
when I
OUT
> 120mA
221kHz to 261kHz
when I
OUT
> 35mA
152kHz to 224kHz
when I
OUT
> 167mA
I
PEAK
1.48A
1.06A
3.51A
L
IDEAL
3.73µH
33.8µH
6.83µH
L
ACTUAL
Sumida CR43-3R3
3.3µH, 86m
Ω
, 1.44A
Sumida CDR74B-330
33µH, 180m
Ω
, 0.97A
Sumida CDRH125-5R8
5.8µH, 17m
Ω
, 4.4A
P
LR
29mW at I
OUT
= 350mA
22mW at I
OUT
= 100mA
22mW at I
OUT
= 500mA
C
OUT(MIN)
to C
OUT(MAX)
14µF to 448µF
10µF to 53µF
120µF to 640µF
C
OUT
33µF
33µF
150µF
ESR
COUT(MIN)
23m
Ω
for stability,
51m
Ω
for soft-start
74m
Ω
for stability,
70m
Ω
for soft-start
21m
Ω
for stability,
21m
Ω
for soft-start
C
OUT(ACTUAL)
Sanyo POSCAP 10TPA33M
33µF, 10V,
60m
Ω
, 100m
Ω
max
AVX TPSD336M020R0200
33µF, 20V,
150m
Ω
, 200m
Ω
max
Sanyo POSCAP 6TPB150M
150µF, 6.3V,
40m
Ω
, 55m
Ω
max
V
RIPPLE(ESR)
27mVp-p at light loads,
81mVp-p at full load
48mVp-p at light loads,
144mVp-p at full load
42mVp-p at light loads,
126mVp-p at full load
C
FF
100pF
100pF
100pF
C
FB
100pF
330pF
220pF
C
IN
10µF, 6.3V ceramic
10µF, 6.3V ceramic
10µF, 6.3V ceramic
MOSFET
Fairchild FDC633N
Fairchild FDC633N
Vishay Si3446DV
Qg
8nC at Vgs = 3V
12nC at Vgs = 5V
9nC at Vgs = 3.6V
10nC at Vgs = 5V
I
GATE
7.3mA nonbootstrapped,
10.9mA bootstrapped
2.4mA nonbootstrapped
2.2mA bootstrapped
I
DIODE(RMS)
0.96A
0.49A
1.84A
Diode
Nihon EP10QY03, 1A
Nihon EP10QY03, 1A
Nihon EC21QS03L, 2A
Table 1. Design Examples Using CCM