MAX8890 MAXIM [Maxim Integrated Products], MAX8890 Datasheet - Page 8

• Manufacturer Part Number: MAX8890
• Description: Integrated Cellular RF-Section Power-Management IC
• Manufacturer: MAXIM [Maxim Integrated Products]

Integrated Cellular RF-Section
Power-Management IC
Figure 2. Functional Diagram
If any one of the three low-dropout linear regulators
(LDOs) is enabled, the internal 1.25V reference powers
up. Therefore, all three LDOs must be disabled to shut
down the internal reference, reducing the supply cur-
rent to 0.01µA.
Pull EN_ low to enter shutdown. When any one of the
linear regulators is shutdown, the corresponding
MAX8890 output disconnects from the corresponding
input, and the output discharges through an internal
8
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EN1
EN2
EN3
IN1
IN2
IN3
R
SENSE
CURRENT
LIMIT
THERMAL
IN1
SHDN
Enable
LINEAR REGULATOR #2
LINEAR REGULATOR #3
LINEAR REGULATOR #1
CIRCUITRY
STARTUP
CONTROL
LOCIC
5k
rate at which V
Connect EN_ to IN_ for normal operation. EN_ can be
pulled as high as 6V, regardless of the input and output
voltages.
Thermal-overload protection limits the MAX8890’s total
power dissipation in the event of fault conditions. Each
linear regulator has its own thermal-shutdown circuitry.
resistor. The capacitance and load determine the
AMPLIFIER
ERROR
OUT
Thermal-Overload Protection
_ decays. Do not leave EN_ floating.
1.25V
REF
OUT1
BP
GND
OUT2
OUT3