MAX667CSA-T Maxim Integrated Products, MAX667CSA-T Datasheet - Page 6

• Manufacturer Part Number: MAX667CSA-T
• Description: Low Dropout (LDO) Regulators 5V Programmable Voltage Regulator
• Manufacturer: Maxim Integrated Products

Specifications of MAX667CSA-T

• Number Of Outputs: 1
• Polarity: Positive
• Input Voltage Max: 16.5 V
• Output Voltage: 1.3 V to 16 V or 5 V
• Output Type: Adjustable, Fixed
• Dropout Voltage (max): 0.06 V at 100 uA
• Output Current: 250 mA
• Line Regulation: 10 mV
• Load Regulation: 100 mV
• Maximum Power Dissipation: 0.471 W
• Maximum Operating Temperature: + 70 C
• Mounting Style: SMD/SMT
• Package / Case: SOIC-8 Narrow
• Minimum Operating Temperature: 0 C
• Reference Voltage: 1.225 V

+5V/Programmable Low-Dropout
Voltage Regulator
put-capacitor ESR and this series resistance should, at
minimum, meet the requirements shown in Figure 4.
An upper limit to the output-capacitor ESR is important
only if step changes to the load are anticipated. Higher
ESR results in higher-amplitude output-voltage tran-
sients when the output current is varied. A Sanyo
OS-CON capacitor, whose ESR is nearly flat over tem-
perature (and is low to begin with), in series with the
appropriate resistor ensures the best load-transient
performance. A less expensive alternative is to use a
tantalum capacitor in series with the resistor.
Figure 6. Quiescent-Current Reduction Below Dropout
6
Figure 5. Alternative Stability Scheme Using Resistor R
_______________________________________________________________________________________
8
IN
6
8
SET
IN
6
SET
MAX667
GND
4
MAX667
GND
4
SHDN
5
OUT
DD
SHDN
5
OUT
2
1
47k
R1
2
C1
10μF
+5V OUT
R
10μF
+5V OUT
C2
0.1μF
In most cases, inexpensive aluminum-electrolytic
capacitors work well with the MAX667 over their entire
temperature range, having sufficient ESR to ensure sta-
bility without the need for a series resistor. The ESR of
aluminum electrolytics rises, often dramatically, as tem-
perature decreases. For surface-mount applications,
certain tantalum capacitors have sufficient ESR; an
example is the TAJB106K016 chip capacitor made by
AVX (phone: [phone], fax: [phone]).
The MAX667 uses a PNP output transistor. When the
input voltage falls below the desired output voltage, the
Figure 7. Connection for Minimum Quiescent Current Near
Dropout
Figure 8. Quiescent Current Below Dropout for Circuit of
Figure 2
8
5
10
IN
SHDN
8
6
4
2
0
0
4
GND
V SHDN = 0V
MAX667
1
INPUT VOLTAGE (V)
1
DD
2
OUT
SET
1M
R3
3
2
6
4
Battery Drain
R2
1M
R1
332k
5
C1
10μF
6
+5V OUT