MAX8860EUA27+T Maxim Integrated Products, MAX8860EUA27+T Datasheet - Page 6

• Manufacturer Part Number: MAX8860EUA27+T
• Description: IC REG LDO 2.77V/ADJ .3A 8-UMAX
• Manufacturer: Maxim Integrated Products

Specifications of MAX8860EUA27+T

• Regulator Topology: Positive Fixed or Adjustable
• Voltage - Output: 2.77V, 1.25 ~ 6.5 V
• Voltage - Input: 2.5 ~ 6.5 V
• Voltage - Dropout (typical): 0.155V @ 300mA
• Number Of Regulators: 1
• Current - Output: 300mA (Min)
• Current - Limit (min): 330mA
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
• Number Of Outputs: 1
• Polarity: Positive
• Input Voltage Max: 6.5 V
• Output Voltage: 2.7 V
• Output Type: Fixed
• Dropout Voltage (max): 0.22 V at 200 mA
• Output Current: 300 mA
• Line Regulation: 0.1 %
• Load Regulation: 0 %
• Voltage Regulation Accuracy: 1.4 %
• Maximum Power Dissipation: 0.33 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 MAX8860 features a 0.5Ω typical P-channel
MOSFET pass transistor. This provides several advan-
tages over similar designs using PNP pass transistors,
including longer battery life. PNP-based regulators
waste considerable amounts of current in dropout when
the pass transistor saturates. They also use high base-
drive currents under large loads. The P-channel
MOSFET requires no base-drive current, which reduces
quiescent current considerably. The MAX8860 con-
sumes less than 165µA of quiescent current whether in
dropout, light-load, or heavy-load applications (see the
Typical Operating Characteristics).
The MAX8860 features Dual Mode operation: it operates
in either a preset voltage mode or an adjustable mode.
In preset voltage mode, internal, trimmed feedback
resistors set the output voltage to an adjustable 1.25V to
6.5V output voltage or a fixed-voltage output of 1.8V
(MAX8860EUA18), 2.5V (MAX8860EUA25), 2.77V
(MAX8860EUA27), 2.82V (MAX8860EUA28), 3V
(MAX8860EUA30), or 3.3V (MAX8860EUA33). Select
this mode by connecting SET to ground. In adjustable
mode, select an output between 1.25V and 6.5V using
two external resistors connected as a voltage divider to
SET (Figure 2). Calculate the output voltage with the fol-
lowing equation:
Low-Dropout, 300mA
Linear Regulator in µMAX
Figure 1. Functional Diagram
6
_______________________________________________________________________________________
Internal P-Channel Pass Transistor
SHDN
GND
IN
MAX8860
PROTECTION
REVERSE
BATTERY
Output Voltage Selection
SHUTDOWN
THERMAL
SENSOR
LOGIC
1.25V
REF
ERROR
AMP
where V
the following equation:
Figure 2. Adjustable Output Using External Feedback
Resistors
BATTERY
DUAL-MODE
COMPARATOR
SET
MOS DRIVER
WITH I
33nF
= 1.25V. To simplify resistor selection, use
C
2.2µF
LIMIT
IN
V
R1 R2
OUT
=
60mV
SHDN
CC
IN
MAX8860
=
GND



DETECT
FAULT
V
V
V
SET
FAULT
OUT
SET
OUT
SET



1
−
+
1



R
R
R1
R2
P
2
1



OUT
SET
FAULT
CC
C
2.2µF
OUT
OUTPUT
VOLTAGE
100kΩ