MAX667C/D MAXIM [Maxim Integrated Products], MAX667C/D Datasheet - Page 8

• Manufacturer Part Number: MAX667C/D
• Description: +5V/Programmable Low-Dropout Voltage Regulator
• Manufacturer: MAXIM [Maxim Integrated Products]

ratio (PSRR) is therefore not specified. Since the output
must be connected to a 10µF or larger filter capacitor,
the capacitor characteristics dominate the PSRR. Large
values of input and output capacitors reduce the ripple.
In addition, both DD and LBI/LBO can trigger on the
lowest DC component of the ripple, particularly at high
load currents. In the case of the low-battery detector,
the ripple can be effectively filtered out by placing a
capacitor to ground in parallel with the LBI input pin.
The high resistance values that can be used for the
voltage divider allow relatively small capacitance val-
ues to form an effective lowpass filter at 120Hz. When
power is first applied, however, this filter tends to hold
LBO low longer than normal.
The low operating current and gain-bandwidth product
of the internal reference and amplifier result in limited
rejection of fast-step input changes. Negative-going
steps, which occur in under 100µs, may turn off the out-
put for several milliseconds. An input filter (nominally
10µF) is recommended if input changes greater than
1V and faster than 100µs (other than turn-on or turn-off)
are anticipated. Figure 12 shows the output response
to a 10mA/100mA instantaneous load step. The rela-
tionship between output-capacitor ESR and load-tran-
sient response is explained in the Output Capacitor
section.
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
8 ___________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 [phone]
© 1994 Maxim Integrated Products
+5V/Programmable Low-Dropout
Voltage Regulator
Figure 12. Output Response to 10mA/100mA Load Step with
10 F Output Capacitor (1.5
CURRENT
+5V OUTPUT
OUTPUT
0.1V/div
100mA
10mA
Transient Considerations
ESR)
200 s/div
Printed USA
TRANSISTOR COUNT: 65
SUBSTRATE MUST BE LEFT UNCONNECTED
___________________Chip Topography
OUT
LBI
is a registered trademark of Maxim Integrated Products.
GND
DD
(1.78mm)
0.070"
IN
SHDN
LBO
SET
(2.71mm)
0.107"