Functional Diagram
Functional Diagrams
Functional Block Diagram
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CONTROL LOGIC
CONTROL
LOGIC
Active-High Enable Input. Force ENABLE high (or connect to IN) to turn the regulator on. Pull ENABLE low (or leave unconnected) to place the device in a low-power shutdown mode. ENABLE is internally pulled down to GND through a 0.25μA current sink.
EN
EN
OV SELECT MUX
OV
SELECT MUX
200mA
200mA
+
+
-
-
REF
REF
UVLO
UVLO
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
THERMAL PROTECTION
THERMAL
PROTECTION
CURRENT LIMIT
CURRENT
LIMIT
OUTPUT VOLTAGE SELECT MUX
OUTPUT
VOLTAGE
SELECT MUX
RESET TIMEOUT
RESET
TIMEOUT
Regulator Input. Bypass IN to GND with a 1μF (min) low-ESR ceramic capacitor.
IN
IN
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
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
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
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
Ground
GND
GND
