MAX8566 Maxim Integrated Products, MAX8566 Datasheet - Page 11

• Manufacturer Part Number: MAX8566
• Description: PWM Internal-Switch Step-Down Regulator
• Manufacturer: Maxim Integrated Products

13–17
18–22
5–12
PIN
23
24
25
26
27
28
29
30
31
32
—
1
2
3
4
SYNCOUT
PWRGD
NAME
MODE
COMP
PGND
REFIN
SYNC
FREQ
GND
BST
V
LSS
EN
______________________________________________________________________________________
LX
SS
FB
EP
IN
DD
Internal-Switch Step-Down Regulator
Monotonic Startup Enable/Disable. Connect MODE to GND or to the center tap of an external resistor-
divider to enable/disable monotonic startup mode.
Error-Amplifier Output. Connect the necessary compensation network from COMP to FB. COMP is
internally pulled to GND when the IC is in shutdown mode.
Power-Good Output. Open-drain output that is high impedance when V
PWRGD is internally pulled low. PWRGD is internally pulled low when the IC is in shutdown mode,
V
High-Side MOSFET Driver Supply. Bypass BST to LX with a 0.1µF capacitor. BST is connected to LSS
through an internal pMOS switch.
Inductor Connection. All LX pins are internally connected together. Connect all LX pins to the
switched side of the inductor. LX is high impedance when the IC is in shutdown mode.
Power Ground. All PGND pins are internally connected. Connect all PGND pins externally to the
power ground plane.
Input Power Supply. All IN pins are internally connected. Connect all IN pins externally to an input
supply from 2.3V to 3.6V. Bypass IN to PGND with 20µF of ceramic capacitance.
Low-Side MOSFET-Driver Supply Voltage. Connect to a 2.3V to 3.6V supply voltage.
IC Supply Voltage Input. Connect V
a 4.7µF capacitor.
External Reference Input. Connect to an external reference. FB regulates to the voltage at REFIN.
Connect REFIN to SS to use the internal reference.
Soft-Start Input. Connect a capacitor from SS to GND to set the soft-start time. See the Soft-Start
section.
Enable Input. Active-high logic input to enable/disable the MAX8566. Connect to IN to enable the IC;
connect to GND to disable the IC.
Synchronization Input. Synchronize to an external clock with a frequency of 250kHz to 2.4MHz. Leave
SYNC unconnected to disable the synchronization function.
Oscillator Frequency Selection. Connect a resistor from FREQ to GND to select the switching
frequency. See the Frequency Select section.
Osci l l ator Outp ut. The S Y N C OU T outp ut i s 180° out- of- p hase fr om the i nter nal osci l l ator or the S Y N C si g nal
to faci l i tate r unni ng a second r eg ul ator 180° out- of- p hase w i th the fi r st to r ed uce i np ut r i p p l e cur r ent.
Analog Circuit Ground
Feedback Input. Connect to the center tap of an external resistor-divider from the output to GND to
set the output voltage.
Exposed Paddle. Connect to a large ground plane for increased thermal performance.
DD
is below the UVLO threshold, or the IC is in thermal shutdown.
High-Efficiency, 10A, PWM
DD
to IN through an external 2Ω resistor. Bypass V
FUNCTION
FB
≥ 90% of 0.6V. Otherwise,
Pin Description
DD
to GND with
11