MAX1598 Datasheet, PDF (8/9 Pages) Maxim Integrated Products – Low-Noise, Low-Dropout, 200mA Linear Regulator

Low-Noise, Low-Dropout, 200mA
Linear Regulator
Use a 0.01µF bypass capacitor at BP for low output volt-
age noise. Increasing the capacitance slightly decreases
output noise but increases startup time. Values above
0.1µF provide no performance advantage and are not rec-
ommended (see the Shutdown Exit Delay graphs in the
Typical Operating Characteristics).
PSRR and Operation from Sources
Other than Batteries
The MAX1598 are designed to deliver low dropout volt-
ages and low quiescent currents in battery-powered
systems. Power-supply rejection is 63dB at low fre-
quencies and rolls off above 10kHz. See the Power-
Supply Rejection Ratio Frequency graph in the Typical
Operating Characteristics.
When operating from sources other than batteries,
improved supply-noise rejection and transient response
can be achieved by increasing the values of the input
and output bypass capacitors, and through passive fil-
tering techniques. The Typical Operating Charac-
teristics show the MAX1598’s line- and load-transient
responses.
_
Selector Guide
OUTPUT VOLTAGE
(xy) CODE
THIN SOT23
PRESET OUTPUT
VOLTAGE (V)
SOT TOP
MARK
MAX1598
THIN
MAX1598EZK25-T
2.50
ADRM
MAX1598EZK28-T
2.80
ADRJ
MAX1598EZK29-T
2.84
ADRN
MAX1598EZK30-T
3.00
ADRO
MAX1598EZK32-T
3.15
ADRP
MAX1598EZK33-T
3.30
ADRQ
MAX1598EZK36-T
3.60
ADRR
MAX1598EZK50-T
5.00
ADRS
Other xy**
x.y0
—
**Other xy between 2.5V and 5V are available in 100mV increments.
Contact factory for other versions. Minimum order quantity is 25,000
units.
Load-Transient Considerations
The MAX1598 load-transient response graphs (see the
Typical Operating Characteristics) show two compo-
nents of the output response: a DC shift from the output
impedance due to the load current change, and the
transient response. Typical transient for a step change
in the load current from 0 to 50mA is 12mV. Increasing
the output capacitor’s value and decreasing the ESR
attenuates the overshoot.
Input-Output (Dropout) Voltage
The regulator’s minimum input-output voltage differen-
tial (or dropout voltage) determines the lowest usable
supply voltage. In battery-powered systems, this deter-
mines the useful end-of-life battery voltage. Because
the MAX1598 uses a P-channel MOSFET pass transis-
tor, their dropout voltage is a function of drain-to-source
on-resistance (R_DS(ON)) multiplied by the load current
(see the Typical Operating Characteristics).
___________________Chip Information
TRANSISTOR COUNT: 247
SUBSTRATE CONNECTED TO GND
8 _______________________________________________________________________________________