MAX8650EEG+ Maxim Integrated Products, MAX8650EEG+ Datasheet - Page 13

• Manufacturer Part Number: MAX8650EEG+
• Description: IC CNTRLR STP DWN 24-QSOP
• Manufacturer: Maxim Integrated Products
• Type: Step-Down (Buck)r

Specifications of MAX8650EEG+

• Internal Switch(s): No
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 0.7 ~ 5.5 V
• Current - Output: 25A
• Frequency - Switching: 200kHz ~ 1.2MHz
• Voltage - Input: 4.5 ~ 28 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 24-QSOP
• Power - Output: 762mW
• Output Voltage: 0.7 V to 5.5 V
• Output Current: 25 A
• Input Voltage: 4.5 V to 28 V
• Mounting Style: SMD/SMT
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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.
POK is an open-drain output on the MAX8650 that mon-
itors the output voltage. When the output is above 92%
Figure 3. Applications Circuit with 500kHz Switching, 10V to 24V Input, and 3.3V/15A Output
OFF
ON
SYNC
EN
POK
SYNCO
C7
R2
R
4.5V to 28V Input Current-Mode Step-Down
FSYNC
C8
R6
R10
R11
R12
______________________________________________________________________________________
R9
R8
=
⎛
⎜
⎝
R5
C5
2
D1
R1
1
f
Power-Good Signal (POK)
S
R13
Controller with Adjustable Frequency
−
162
ns
⎞
⎟
⎠
11
24
23
22
21
20
16
19
18
17
⎛
⎜
⎝
1
3
16 34
FSYNC
EN
POK
SYNCO
SCOMP
ILIM2
REFIN
SS
ILIM1
COMP
FB
OVP
1
.
k
Ω
ns
MAX8650EEG
⎞
⎟
⎠
MODE
PGND
GND
CS+
BST
AVL
CS-
DH
DL
LX
VL
IN
2
4
5
6
7
8
9
10
12
14
15
13
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 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.
C12
C6
C11
D2
C13
C15
Q1
Q2
Thermal-Overload Protection
10V TO 24V
C3
C2
C1
V
IN
R14
C10
L1
R15
C9A
C14
C9B
3.3V/15A
V
OUT
13