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MAX8650EEG+

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P25
The MAX8650 can also be synchronized to an external
clock by connecting the clock signal to FSYNC. In
addition, SYNCO is provided to synchronize a second
MAX8650 controller 180° out-of-phase with the first by
connecting SYNCO of the first controller to FSYNC of
the second. When the first controller is synchronized to
an external clock, the external clock is inverted to gen-
erate SYNCO. Therefore, to get 180° out-of-phase oper-
ation, the clock input to the first controller should have
a 50% duty cycle.
Power-Good Signal (POK)
POK is an open-drain output on the MAX8650 that mon-
itors the output voltage. When the output is above 92%
of its nominal regulation voltage, POK is high imped-
ance. When the output drops below 89% of its nominal
regulation voltage, POK is internally pulled low. POK is
also internally pulled low when the MAX8650 is shut
down. To use POK as a logic-level signal, connect a
pullup resistor from POK to the logic supply rail.
Thermal-Overload Protection
Thermal-overload protection limits total power dissipa-
tion in the MAX8650. When the junction temperature
exceeds +160°C, an internal thermal sensor shuts
down the device, allowing the IC to cool. The thermal
sensor turns the IC on again after the junction tempera-
ture cools by 15°C, resulting in a pulsed output during
continuous thermal-overload conditions.
R
f
ns
k
ns
FSYNC
S
=−
⎛
⎝
⎜
⎞
⎠
⎟
⎛
⎝
⎜
⎞
⎠
⎟
1
2
162
1
16 34
Ω
.
MAX8650
4.5V to 28V Input Current-Mode Step-Down
Controller with Adjustable Frequency
______________________________________________________________________________________ 13
SYNC
EN
ON
R2
R1
R5
R6
C5
C13
R14
Q1
Q2
D2
D1
C11
C6
FSYNC
EN
POK
SYNCO
SCOMP
ILIM2
REFIN
SS
ILIM1
COMP
FB
OVP
2
4
5
6
7
8
9
10
12
14
15
13
MODE
BST
DH
LX
DL
PGND
VL
IN
AVL
CS+
CS-
GND
1
11
24
3
23
22
21
20
16
19
18
17
C9A
C9B
C14
R15
C3
V
OUT
3.3V/15A
V
IN
10V TO 24V
L1
C15
C10
C12
C7
C8
R13
R9
R10
R8
OFF
POK
SYNCO
MAX8650EEG
C2
C1
R11
R12
Figure 3. Applications Circuit with 500kHz Switching, 10V to 24V Input, and 3.3V/15A Output
MAX8650
4.5V to 28V Input Current-Mode Step-Down
Controller with Adjustable Frequency
14 ______________________________________________________________________________________
Table 1. Component List for Figure 3
COMPONENT DESCRIPTION VENDOR/PART QUANTITY
C1, C2, C3 10µF, 25V X5R ceramic capacitors TDK C3225X5R1E106M (1210) 3
C5, C6 0.1µF, 10V X7R ceramic capacitors Kemet C0603C104M9RAC (0603) 2
C7 220pF, 50V X7R ceramic capacitor TDK C1608X7R1H271K 1
C8 Not installed — 0
C9A, C9B
150µF ±20%, 4V, 7mΩ ESR polymer
aluminum electrolytic capacitors
Panasonic EEFSDOG151R 2
C10, C14 0.47µF ±10%, 10V X5R ceramic capacitors Taiyo Yuden LMK107BJ474KA (0603) 2
C11 4.7µF, 10V X5R ceramic capacitor TDK C2012X5R1A475M (0805) 1
C12 100pF, 25V C0G ceramic capacitor Kemet C603C101K3GAC (0603) 1
C13, C15 1µF, 16V X5R ceramic capacitors TDK C1608X7R1C105M (0603) 2
D1 100V, 200mA switching diode Central CMPD914 (SOT23) 1
D2 30V, 100mA Schottky diode Central CMPSH-3 (SOT23) 1
L1
1.2µH, 18.2A, 2.6mΩ max, 2.16mΩ typ
inductor
TOKO FDA1254-1R2M 1
Q1 30V n-channel MOSFET Fairchild FDS7296N3 1
Q2 30V n-channel MOSFET Fairchild FDS7088SN3 1
R1 51.1kΩ ±1% resistor (0603) — 1
R2 100kΩ ±5% resistor (0603) — 1
R3 0Ω resistor — 1
R4 Not installed — 0
R5 17.4kΩ ±1% resistor (0603) — 1
R6 130kΩ ±1% resistor (0603) — 1
R8 220kΩ ±5% resistor (0603) — 1
R9, R11 7.5kΩ ±1% resistors (0603) — 2
R10, R12 28.0kΩ ±1% resistors (0603) — 2
R13 39.2kΩ ±1% resistor (0603) — 1
R14 2.4kΩ ±5% resistor (0603) — 1
R15 39.2kΩ ±5% resistor (0603) — 1
MAX8650
4.5V to 28V Input Current-Mode Step-Down
Controller with Adjustable Frequency
______________________________________________________________________________________ 15
SYNC
EN
ON
R1
R2
R5
R6
C4
C3
C12
R11
Q1
Q2
D2
D1
OPTIONAL
C10
C5
FSYNC
EN
POK
SYNCO
SCOMP
ILIM2
REFIN
SS
COMP
FB
OVP
2
4
5
6
7
8
9
10
12
14
15
13
MODE
BST
DH
LX
DL
PGND
VL
IN
AVL
CS+
CS-
GND
1
11
24
3
23
22
21
20
19
18
17
C8A
C13
R12
V
OUT
0.9V ±8A
V
IN
10.8V TO 13.2V
L1
C14
C9
C11
C6
C7
R9
R8
OFF
POK
SYNCO
MAX8650
C2
C1
R10
C8B C8C C8D C8E
ILIM1
16
V
REFIN
0.9V
DC
R7
Figure 4. Applications Circuit with 400kHz Switching, 12V Input, and 0.9V ±8A Output
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P25

MAX8650EEG+

Mfr. #:
Buy MAX8650EEG+
Manufacturer:
Maxim Integrated
Description:
Switching Controllers 4.5-28V Current-Mode Step-Down Controller
Lifecycle:
New from this manufacturer.
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