Application Circuits
Typical Application Circuits
Circuit 1
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Regulator Input. Bypass IN to GND with a 1μF (min) low-ESR ceramic capacitor.
IN
IN
Feedback Network Selector. Connect SET to GND when operating the MAX25210 in fixed output voltage mode (3.3V or 5V) using the internal feedback network. Connect SET to IN or any voltage higher than 2.4V when an external feedback network (resistive divider) is used, operating the MAX25210 in adjustable output-voltage mode.
SET
SET
Ground
GND
GND
Reset-Timeout-Period Adjust Input. Internal capacitance produces a 60μs default delay when TIMEOUT is left unconnected. Connect a capacitor from TIMEOUT to GND to set a longer timeout period than default.
TIMEOUT
TIMEOUT
Regulator Output. Bypass OUT to GND with a minimum of 2.2μF. Use a low-ESR, ceramic capacitor (X7R, X5R) for optimal performance. The SETOV input controls the output voltage when in fixed +3.3V or fixed +5V output-voltage mode. Using an external resistive divider between OUT and SETOV sets adjustable output voltage from +0.6V to +11V.
OUT
OUT
Regulated Output-Voltage Selector. Connect SETOV to OUT for a 5V fixed output, or connect SETOV to GND for a 3.3V fixed output. SETOV becomes the feedback path when using an external resistive divider for an adjustable output. If SETOV pin driven externally, 1kΩ resistor in series is required.
SETOV
SETOV
Active-Low, Open-Drain Reset Output. RESET asserts low when OUT is below the reset threshold, and remains low for the duration of the reset timeout period after the reset conditions end. RESET also asserts low when ENABLE is low and during thermal shutdown. The pullup voltage on the RESET pin must be greater than 1.5V.
RESET
RESET
MAX25210
MAX25210
ENABLE
ENABLE
1µF
1µF
2.2µF
2.2µF
10kΩ
10k
Circuit 2
Regulator Input. Bypass IN to GND with a 1μF (min) low-ESR ceramic capacitor.
IN
IN
Feedback Network Selector. Connect SET to GND when operating the MAX25210 in fixed output voltage mode (3.3V or 5V) using the internal feedback network. Connect SET to IN or any voltage higher than 2.4V when an external feedback network (resistive divider) is used, operating the MAX25210 in adjustable output-voltage mode.
SET
SET
Ground
GND
GND
Reset-Timeout-Period Adjust Input. Internal capacitance produces a 60μs default delay when TIMEOUT is left unconnected. Connect a capacitor from TIMEOUT to GND to set a longer timeout period than default.
TIMEOUT
TIMEOUT
Regulator Output. Bypass OUT to GND with a minimum of 2.2μF. Use a low-ESR, ceramic capacitor (X7R, X5R) for optimal performance. The SETOV input controls the output voltage when in fixed +3.3V or fixed +5V output-voltage mode. Using an external resistive divider between OUT and SETOV sets adjustable output voltage from +0.6V to +11V.
OUT
OUT
Regulated Output-Voltage Selector. Connect SETOV to OUT for a 5V fixed output, or connect SETOV to GND for a 3.3V fixed output. SETOV becomes the feedback path when using an external resistive divider for an adjustable output. If SETOV pin driven externally, 1kΩ resistor in series is required.
SETOV
SETOV
Active-Low, Open-Drain Reset Output. RESET asserts low when OUT is below the reset threshold, and remains low for the duration of the reset timeout period after the reset conditions end. RESET also asserts low when ENABLE is low and during thermal shutdown. The pullup voltage on the RESET pin must be greater than 1.5V.
RESET
RESET
3.3V FIXED OUTPUT
3.3V FIXED OUTPUT
MAX25210
MAX25210
ENABLE
ENABLE
1µF
1µF
+
+
-
-
14V BATTERY
14V
BATTERY
2.2µF
2.2µF
10kΩ
10kΩ
µC
µC
VCC
V
CC
Regulator Input. Bypass IN to GND with a 1μF (min) low-ESR ceramic capacitor.
IN
IN
Feedback Network Selector. Connect SET to GND when operating the MAX25210 in fixed output voltage mode (3.3V or 5V) using the internal feedback network. Connect SET to IN or any voltage higher than 2.4V when an external feedback network (resistive divider) is used, operating the MAX25210 in adjustable output-voltage mode.
SET
SET
Ground
GND
GND
Reset-Timeout-Period Adjust Input. Internal capacitance produces a 60μs default delay when TIMEOUT is left unconnected. Connect a capacitor from TIMEOUT to GND to set a longer timeout period than default.
TIMEOUT
TIMEOUT
Regulator Output. Bypass OUT to GND with a minimum of 2.2μF. Use a low-ESR, ceramic capacitor (X7R, X5R) for optimal performance. The SETOV input controls the output voltage when in fixed +3.3V or fixed +5V output-voltage mode. Using an external resistive divider between OUT and SETOV sets adjustable output voltage from +0.6V to +11V.
OUT
OUT
Regulated Output-Voltage Selector. Connect SETOV to OUT for a 5V fixed output, or connect SETOV to GND for a 3.3V fixed output. SETOV becomes the feedback path when using an external resistive divider for an adjustable output. If SETOV pin driven externally, 1kΩ resistor in series is required.
SETOV
SETOV
5V FIXED OUTPUT
5V FIXED OUTPUT
MAX25210
MAX25210
ENABLE
ENABLE
1µF
1µF
+
+
-
-
14V BATTERY
14V
BATTERY
2.2µF
2.2µF
10kΩ
10kΩ
µC
µC
VCC
V
CC
Regulator Input. Bypass IN to GND with a 1μF (min) low-ESR ceramic capacitor.
IN
IN
Feedback Network Selector. Connect SET to GND when operating the MAX25210 in fixed output voltage mode (3.3V or 5V) using the internal feedback network. Connect SET to IN or any voltage higher than 2.4V when an external feedback network (resistive divider) is used, operating the MAX25210 in adjustable output-voltage mode.
SET
SET
Ground
GND
GND
Reset-Timeout-Period Adjust Input. Internal capacitance produces a 60μs default delay when TIMEOUT is left unconnected. Connect a capacitor from TIMEOUT to GND to set a longer timeout period than default.
TIMEOUT
TIMEOUT
Regulator Output. Bypass OUT to GND with a minimum of 2.2μF. Use a low-ESR, ceramic capacitor (X7R, X5R) for optimal performance. The SETOV input controls the output voltage when in fixed +3.3V or fixed +5V output-voltage mode. Using an external resistive divider between OUT and SETOV sets adjustable output voltage from +0.6V to +11V.
OUT
OUT
Regulated Output-Voltage Selector. Connect SETOV to OUT for a 5V fixed output, or connect SETOV to GND for a 3.3V fixed output. SETOV becomes the feedback path when using an external resistive divider for an adjustable output. If SETOV pin driven externally, 1kΩ resistor in series is required.
SETOV
SETOV
ADJUSTABLE LAYOUT
ADJUSTABLE LAYOUT
MAX25210
MAX25210
ENABLE
ENABLE
1µF
1µF
+
+
-
-
14V BATTERY
14V
BATTERY
10kΩ
10kΩ
µC
µC
VCC
V
CC
C1*
C1*
R1
R1
2.2µF
10µF
R2
R2
*Optional Feedforward Capacitor
*OPTIONAL FEEDFORWARD CAPACITOR
Active-Low, Open-Drain Reset Output. RESET asserts low when OUT is below the reset threshold, and remains low for the duration of the reset timeout period after the reset conditions end. RESET also asserts low when ENABLE is low and during thermal shutdown. The pullup voltage on the RESET pin must be greater than 1.5V.
RESET
RESET
Active-Low, Open-Drain Reset Output. RESET asserts low when OUT is below the reset threshold, and remains low for the duration of the reset timeout period after the reset conditions end. RESET also asserts low when ENABLE is low and during thermal shutdown. The pullup voltage on the RESET pin must be greater than 1.5V.
RESET
RESET
Active-Low, Open-Drain Reset Output. RESET asserts low when OUT is below the reset threshold, and remains low for the duration of the reset timeout period after the reset conditions end. RESET also asserts low when ENABLE is low and during thermal shutdown. The pullup voltage on the RESET pin must be greater than 1.5V.
RESET
RESET
Active-Low, Open-Drain Reset Output. RESET asserts low when OUT is below the reset threshold, and remains low for the duration of the reset timeout period after the reset conditions end. RESET also asserts low when ENABLE is low and during thermal shutdown. The pullup voltage on the RESET pin must be greater than 1.5V.
RESET
RESET
Active-Low, Open-Drain Reset Output. RESET asserts low when OUT is below the reset threshold, and remains low for the duration of the reset timeout period after the reset conditions end. RESET also asserts low when ENABLE is low and during thermal shutdown. The pullup voltage on the RESET pin must be greater than 1.5V.
RESET
RESET
