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MAX17524 Fiches technique(PDF) 12 Page - Maxim Integrated Products

No de pièce MAX17524
Description  4.5V to 60V, 3A, Dual-Output, High-Efficiency,Synchronous Step-Down DC-DC Converter
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Fabricant  MAXIM [Maxim Integrated Products]
Site Internet  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX17524 Fiches technique(HTML) 12 Page - Maxim Integrated Products

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PIN
NAME
FUNCTION
7
SS1
Soft-Start Input for Converter 1. Connect a capacitor from SS1 to SGND to set the soft-start time.
8
CF1
Compensator Output for Converter 1. At switching frequencies, lower than 450kHz, connect a capacitor
from CF1 to FB1. Leave CF1 open if the switching frequency is equal to, or more than 450kHz. See the
Loop Compensation section for more details.
9
FB1
Feedback Input for Converter 1. Connect FB1 to the center tap of an external resistor-divider from the
output node of converter 1 to SGND to set the output voltage. See the Adjusting Output Voltage section
for more details.
10
RT
Programmable Switching Frequency Input. Connect a resistor from RT to SGND to set the switching
frequency of both the converters. Leave RT open for the default 450kHz frequency. See the Setting the
Switching Frequency (RT) section for more details.
11
RESET1
Open-Drain RESET1 Output. The RESET1 output is driven low if FB1 drops below 92.5% of its set value.
RESET1 goes high 1024 cycles after FB1 rises above 95.5% of its set value.
12
MODE/
SYNC1
Mode Selection and External Clock Synchronization Input for Converter 1. The MODE/SYNC1 Pin
configures the converter 1 to operate either in PWM, PFM or DCM modes of operation. Leave MODE/
SYNC1 unconnected for PFM operation (pulse skipping at light loads). Connect MODE/SYNC1 to SGND
for constant-frequency PWM operation at all loads. Connect MODE/SYNC1 to VCC1 for DCM operation
at light loads. MODE/SYNC1 can also be used to synchronize the converter 1 to an external clock irre-
spective of the operating condition of converter 2. See the Mode Selection and External Synchronization
(MODE/SYNC) section for more details.
13
SGND
Analog Ground
14
MODE/
SYNC2
Mode Selection and External Clock Synchronization Input for Converter 2. The MODE/SYNC2 Pin
configures the converter 2 to operate either in PWM, PFM or DCM modes of operation. Leave MODE/
SYNC2 unconnected for PFM operation (pulse skipping at light loads). Connect MODE/SYNC2 to SGND
for constant-frequency PWM operation at all loads. Connect MODE/SYNC2 to VCC2 for DCM operation
at light loads. MODE/SYNC2 can also be used to synchronize the converter 2 to an external clock irre-
spective of the operating condition of converter 1. See the Mode Selection and External Synchronization
(MODE/SYNC) section for more details.
15
RESET2
Open-Drain RESET2 Output. The RESET2 output is driven low if FB2 drops below 92.5% of its set value.
RESET2 goes high 1024 cycles after FB2 rises above 95.5% of its set value.
16
FB2
Feedback Input for Converter 2. Connect FB2 to the center tap of an external resistor-divider from the
output node of converter 2 to SGND to set the output voltage. See the Adjusting Output Voltage section
for more details.
17
CF2
Compensator Output for Converter 2. At switching frequencies, lower than 450kHz, connect a capacitor
from CF2 to FB2. Leave CF2 open if the switching frequency is equal to, or more than 450kHz. See the
Loop Compensation section for more details.
18
SS2
Soft-Start Input for Converter 2. Connect a capacitor from SS2 to SGND to set the soft-start time.
19
EXTVCC2
External Power-Supply Input for the Internal LDO of Converter 2. Applying a voltage between 4.84V and
24V at the EXTVCC2 pin bypasses the internal LDO and improves efficiency. Add a local bypassing cap
(0.1μF) on EXTVCC2 pin to SGND and also add a 4.7Ω resistor from the buck converter output node to
the EXTVCC2 pin to limit VCC2 bypass-cap discharge current during an output short-circuit condition.
When EXTVCC2 is not used, connect it to SGND.
Pin Description (continued)
www.maximintegrated.com
Maxim Integrated │ 12
MAX17524
4.5V to 60V, 3A, Dual-Output, High-Efficiency,
Synchronous Step-Down DC-DC Converter


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