MAX8719ETA+T Maxim Integrated Products, MAX8719ETA+T Datasheet - Page 7

• Manufacturer Part Number: MAX8719ETA+T
• Description: IC REG LINEAR LP HV 8-TDFN
• Manufacturer: Maxim Integrated Products

Specifications of MAX8719ETA+T

• Applications: Converter, Notebook Computer
• Voltage - Input: 4 ~ 28 V
• Number Of Outputs: 1
• Voltage - Output: 1.24 ~ 28 V
• Operating Temperature: 0°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-TDFN Exposed Pad
• Polarity: Positive
• Input Voltage Max: 28 V
• Output Voltage: 1.24 V to 28 V
• Output Type: Adjustable
• Dropout Voltage (max): 0.56 V at 100 mA
• Output Current: 100 mA
• Voltage Regulation Accuracy: 2%
• Maximum Power Dissipation: 1.951 W
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

The MAX8718/MAX8719 low-quiescent-current linear
regulators are designed primarily for high-input-voltage
applications. The MAX8718 supplies a preselected
3.3V or 5.0V output for loads up to 100mA (Figure 1).
The MAX8719 provides an adjustable voltage from
1.24V to 28V (Figure 2). The maximum output current is
a function of the package’s maximum power dissipation
for a given temperature. A 5µA load is required to main-
tain output regulation.
The MAX8718’s output voltage is fed back through an
internal resistive voltage-divider connected to OUT. Set
the output voltage to either 5.0V or 3.3V with the 5/3
Figure 1. Typical Operating Circuit of the MAX8718
MAX8718
6V TO
High-Voltage, Low-Power Linear Regulators for
28V
—
1
2
3
4
5
6
7
8
1µF
PIN
MAX8719
—
1
2
3
4
5
6
7
8
_______________________________________________________________________________________
IN
SHDN
I.C.
Detailed Description
MAX8718
PGOOD
NAME
GND
SHDN
GND
OUT
V
I.C.
5/3
FB
IN
CC
PGOOD
OUT
V
5/3
CC
Positive Supply Input. Connect to a +4V to +28V supply.
Ground
P r eset Outp ut- V ol tag e S el ect Inp ut. C onnect 5/3 to GN D for 3.3V outp ut, or to OU T for 5V outp ut.
Feedback Input. Regulates to 1.24V nominally.
PGOOD Sense Input
Power-Good Output
Shutdown Control Input
Internal Connection. This pin is internally connected for test purposes; leave it unconnected
in the application.
100mA Regulator Output
100kΩ
10µF
OUTPUT
3.3V
PGOOD
pin. Select the 5V output by connecting 5/3 to OUT, or
the 3.3V output by connecting 5/3 to GND.
The MAX8719’s output is adjustable with an external
resistive voltage-divider. The typical feedback thresh-
old is 1.24V (see the
Voltage section). See Figure 3 for the MAX8718/
MAX8719 Functional Diagram.
The device enters shutdown mode when SHDN is low.
In shutdown mode, the internal pnp power transistor,
control circuit, reference, and all biases turn off, reduc-
ing the supply current to below 3µA. Connect SHDN to
IN for automatic startup.
Figure 2. Typical Operating Circuit of the MAX8719
6V TO
28V
Notebook Computers
1µF
FUNCTION
SHDN
I.C.
IN
MAX8719
Setting the MAX8719 Output
GND
PGOOD
Pin Description
OUT
V
CC
FB
100kΩ
Shutdown
R1
R2
10µF
OUTPUT
PGOOD
7