MAX8888 MAXIM [Maxim Integrated Products], MAX8888 Datasheet - Page 7

• Manufacturer Part Number: MAX8888
• Description: Low-Dropout, 300mA Linear Regulators in SOT23
• Manufacturer: MAXIM [Maxim Integrated Products]

Figure 1. Functional Diagram
put capacitors with an ESR of 0.1Ω or less to ensure sta-
bility and optimum transient response. Surface-mount
ceramic capacitors have very low ESR and are com-
monly available in values up to 10µF. Connect C
C
minimize the impact of PC board trace inductance.
The MAX8887/MAX8888 are designed to operate with
low dropout voltages and low quiescent currents in bat-
tery-powered systems while still maintaining excellent
noise, transient response, and AC rejection. See the
Typical Operating Characteristics for a plot of power-
supply rejection ratio (PSRR) versus frequency. When
operating from noisy sources, improved supply-noise
rejection and transient response can be achieved by
increasing the values of the input and output bypass
capacitors and through passive filtering techniques.
A regulator’s minimum input-to-output voltage differen-
tial (dropout voltage) determines the lowest usable sup-
ply voltage at which the output is regulated. In
battery-powered systems, this determines the useful
end-of-life battery voltage. The MAX8887/MAX8888 use
a P-channel MOSFET pass transistor. Its dropout volt-
age is a function of drain-to-source on-resistance
(R
Typical Operating Characteristics).
OUT
Low-Dropout, 300mA Linear Regulators in SOT23
DS(ON)
as close to the MAX8887/MAX8888 as possible to
Noise, PSRR, and Transient Response
V
DROPOUT
) multiplied by the load current (see the
SHDN
GND
Input-Output (Dropout) Voltage
IN
MAX8888
= V
_______________________________________________________________________________________
IN
- V
OUT
= R
SHUTDOWN
THERMAL
DS(ON)
SENSOR
LOGIC
✕
I
OUT
IN
1.25V
REF
and
95%
REF
ERROR
AMP
TRANSISTOR COUNT: 620
PROCESS: BiCMOS
Figure 2. Power Operating Regions: Maximum Output Current
vs. Input Voltage
POK
MOS DRIVER
WITH I
400
300
200
100
0
LIMIT
0
MAXIMUM RECOMMENDED OUTPUT CURRENT
0.5
MAXIMUM OUTPUT CURRENT
(POWER DISSIPATION LIMIT)
1.0
vs. INPUT VOLTAGE
1.5
(V
IN
- V
2.0
Chip Information
OUT
) (V)
2.5
P
3.0
T
T
A
A
= +85°C
= +70°C
OUT
POK
3.5
4.0
7