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MAX668EUB Datasheet(PDF) 11 Page - Maxim Integrated Products

Part # MAX668EUB
Description  1.8V to 28V Input, PWM Step-Up Controllers in 關MAX
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX668EUB Datasheet(HTML) 11 Page - Maxim Integrated Products

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Non-Bootstrapped Operation
With non-bootstrapped operation, the IC is powered
from the input voltage (VIN) or another source, such as
a logic supply. Non-bootstrapped operation (Figure 4)
is recommended (but not required) for input voltages
above 5V, since the EXT amplitude (limited to 5V by
LDO) at this voltage range is no higher than it would be
with bootstrapped operation. Note that non-boot-
strapped operation is
required if the output voltage
exceeds 28V, since this level is too high to safely con-
nect to VCC. Also note that only the MAX668 can be
used with non-bootstrapped operation.
If the input voltage does not exceed 5.5V, the on-chip
regulator can be disabled by connecting VCC to LDO
(Figure 5). This eliminates the regulator forward drop
and supplies the maximum gate drive to the external
FET for lowest on-resistance. Disabling the regulator
also reduces the non-bootstrapped minimum input volt-
age from 3V to 2.7V.
1.8V to 28V Input, PWM Step-Up
Controllers in µMAX
______________________________________________________________________________________
11
MAX668
LDO
CS+
REF
FREQ
VCC
SYNC/
SHDN
PGND
FB
GND
N1
EXT
VIN = 2.7V to 5.5V
C3
0.22
µF
C2
1
µF
R4
100k
1%
R1
0.02
R2
218k
1%
R3
24.9k
1%
C7
220pF
D1
MBRS340T3
C4
68
µF
20V
C5
68
µF
20V
C6
0.1
µF
3
5
7
6
8
2
4
9
1
10
VOUT = 12V @ 1A
C1
68
µF
10V
L1
4.7
µH
FDS6680
Figure 5. MAX668 Low-Voltage Non-Bootstrapped Configuration
MAX668
LDO
CS+
REF
FREQ
VCC
PGND
FB
GND
N1
EXT
VIN = 3V to 12V
C3
0.22
µF
C4
1
µF
C2
0.1
µF
R4
100k
1%
R1
0.02
R2
218k
1%
R3
24.9k
1%
C7
220pF
D1
MBRS340T3
C5
68
µF
20V
C6
68
µF
20V
C8
0.1
µF
3
5
7
6
8
2
4
9
1
10
VOUT = 12V @ 1A
C1
68
µF
20V
L1
4.7
µH
FDS6680
SYNC/
SHDN
Figure 4. MAX668 High-Voltage Non-Bootstrapped Configuration


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