MAX1522/MAX1523/MAX1524
Simple SOT23 Boost Controllers
______________________________________________________________________________________ 13
PARAMETER EXAMPLE 4 EXAMPLE 5
V
IN
2.7V to 4.2V 1.8V to 3.0V
V
OUT
24V 3.3V
I
OUT(MAX)
30mA 100mA
R1, R2 909kΩ, 49.9kΩ 150kΩ, 93.1kΩ
Duty Cycle (max) 89.0% 52.6%
t
ON
3µs
(SET = V
CC
)
0.5µs
(SET = GND)
L
IDEAL
11.9µH 1.14µH
L
ACTUAL
Sumida
CDRH5D28-100
10µH, 65mΩ,
1.3A
Sumida
CDRH4D18-1R0
1µH, 45mΩ,
1.72A
I
PEAK
1.51A 1.80A
P
LR
4.5mW at
I
OUT
= 10mA
5.7mW
I
OUT
= 50mA
f
SWITCHING
208kHz when
I
OUT
= 20mA
737kHz when
I
OUT
= 100mA
C
OUT(MIN)
to
C
OUT(MAX)
0.8µF to 2.7µF 3µF to 97µF
C
OUT(ACTUAL)
Taiyo Yuden
GMK325BJ225K
2.2µF, X5R, 35V,
1210
Taiyo Yuden
TMK316BT106ML
10µF, X7R, 6.3V,
1206
ESR
COUT
ACTUAL
10mΩ 10mΩ
V
RIP P LE
C OU T+ E S R
126mV
P-P
40mV
P-P
C
FF
100pF 220pF
C
FB
220pF 100pF optional
C
IN
10µF, 6.3V 10µF, 6.3V
MOSFET
Fairchild
FDC633N
Vishay Si2302DS
Qg 8nC at Vgs = 3V 5nC at Vgs = 3.3V
I
GATE
1.7mA
nonbootstrapped
3.7mA
bootstrapped
I
DIODE(RMS)
0.17A 0.42A
Diode
Nihon
EP10QY03, 1A
Nihon
EP10QY03, 1A
Table 2. Design Examples Using DCM
MANUFACTURER PHONE WEB
Coilcraft 847-639-6400 www.coilcraft.com
Fairchild 800-341-0392 www.fairchildsemi.com
International
Rectifier
310-322-3331 www.irf.com
Kemet 408-986-0424 www.kemet.com
NIC Components 408-954-8470 www.niccomp.com
Panasonic 847-468-5624 www.panasonic.com
Sumida 847-956-0666 www.sumida.com
Taiyo Yuden 408-573-4150 www.t-yuden.com
Table 3. Component Manufacturers
Chip Information
TRANSISTOR COUNT: 1302
Package Information
For the latest package outline information and land patterns, go
to www.maxim-ic.com/packages
. Note that a “+”, “#”, or “-” in
the package code indicates RoHS status only. Package draw-
ings may show a different suffix character, but the drawing per-
tains to the package regardless of RoHS status.
PACKAGE
TYPE
PACKAGE
CODE
OUTLINE
NO.
LAND
PATTERN NO.
6 SOT23 U6+1
21-0058 90-0175
