MAX8566ETJ+ Maxim Integrated Products, MAX8566ETJ+ Datasheet - Page 14

• Manufacturer Part Number: MAX8566ETJ+
• Description: IC REG STP DWN 10A 32-TQFN
• Manufacturer: Maxim Integrated Products
• Type: Step-Down (Buck)r

Specifications of MAX8566ETJ+

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 0.6 ~ 3.1 V
• Current - Output: 10A
• Frequency - Switching: 250kHz ~ 4.2MHz
• Voltage - Input: 2.3 ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 32-TQFN Exposed Pad
• Power - Output: 2.67W
• Output Voltage: 0.5 V
• Input Voltage: 2.3 V to 3.6 V
• Switching Frequency: 2 MHz
• Operating Temperature Range: - 40 C to + 85 C
• Mounting Style: SMD/SMT
• Duty Cycle (max): 95 %
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

The UVLO circuitry inhibits switching when V
below 2V. Once V
the soft-start function activates. A 100mV hysteresis is
built in for glitch immunity.
When starting up into a precharged output, the MAX8566
does not discharge the output prior to entering soft-start
(known as monotonic startup). Drive MODE to 1/3 of V
to enable monotonic startup mode. Connect MODE to
GND to disable monotonic startup mode.
High-Efficiency, 10A, PWM
Internal-Switch Step-Down Regulator
Figure 2. Soft-Start Implementation with External Reference
Figure 3. Typical Application Circuit
14
______________________________________________________________________________________
POWER-GOOD
2.3V TO 3.6V
OUTPUT
V
Monotonic Startup Modes (MODE)
OPEN
IN
R1
10µF
C24
C1
R2
Undervoltage Lockout (UVLO)
DD
20kΩ
10µF
C2
R2
rises above 2V, UVLO clears and
20kΩ
10kΩ
R17
R18
C
10Ω
R1
REFIN
0.22µF
1µF
C4
MAX8566
C3
R3
50kΩ
23
18
19
20
21
22
24
27
25
28
29
3
1
LSS
IN
IN
IN
IN
IN
V
PWRGD
EN
REFIN
SYNC
FREQ
MODE
DD
DD
DD
MAX8566
is
31
GND
SYNCOUT
The gate-drive voltage for the high-side, n-channel
switch is generated by a flying-capacitor boost circuit.
The capacitor between BST and LX is charged from the
V
the low-side MOSFET is switched off, the stored voltage
of the capacitor is stacked above LX to provide the
necessary turn-on voltage for the high-side internal
MOSFET.
The switching frequency is resistor programmable from
250kHz to 2.4MHz. Set the switching frequency of the
IC with a resistor from FREQ to GND (R
calculated as:
where f
The MAX8566 features a SYNC function that allows the
switching frequency to be synchronized to any frequen-
cy between 250kHz to 2.4MHz. Drive SYNC with a
LSS
PGND
PGND
PGND
PGND
PGND
COMP
BST
LX
LX
LX
LX
LX
LX
LX
LX
SS
FB
High-Side MOSFET Driver Supply (BST)
supply while the low-side MOSFET is on. When
4
5
6
7
8
9
10
11
12
17
16
15
14
13
32
2
30
26
S
0.047µF
is the desired switching frequency in Hz.
C5
R
SYNC Function (SYNC, SYNCOUT)
FREQ
16.9kΩ
R7
C11
0.022µF
2kΩ
3300pF
0.47µH
=
L1
0 95
330pF
22pF
50
C10
C9
.
22µF
Frequency Select (FREQ)
C6
k
Ω
µ
s
22µF
×
C7
24.9kΩ
12.4kΩ
⎛
⎜
⎝
f
1
s
R5
R6
−
0 05
.
FREQ
µ
1.8V AT 10A
R4
100Ω
s
C8
120pF
V
⎞
⎟
⎠
OUT
). R
FREQ
is