MAX1819EBL33+T Maxim Integrated Products, MAX1819EBL33+T Datasheet - Page 5

• Manufacturer Part Number: MAX1819EBL33+T
• Description: IC REG LDO 3.3V/ADJ 500MA 6-UCSP
• Manufacturer: Maxim Integrated Products

Specifications of MAX1819EBL33+T

• Regulator Topology: Positive Fixed or Adjustable
• Voltage - Output: 3.3V, 1.25 ~ 5 V
• Voltage - Input: 2.5 ~ 5.5 V
• Voltage - Dropout (typical): 0.133V @ 500mA, -
• Number Of Regulators: 1
• Current - Output: 500mA (Min)
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 6-UCSP®
• Number Of Outputs: 1
• Polarity: Positive
• Input Voltage Max: 5.5 V
• Output Voltage: 1.25 V to 5 V, 3.3 V
• Output Type: Adjustable, Fixed
• Dropout Voltage (max): 0.232 V at 500 mA
• Output Current: 500 mA
• Line Regulation: 0 %
• Load Regulation: 0.4 %
• Voltage Regulation Accuracy: 1 %
• Maximum Power Dissipation: 0.84 W
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Reference Voltage: 1.25 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Limit (min): -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

The MAX1819 is a low-dropout, low-quiescent-current
linear regulator designed primarily for battery-powered
applications. The device supplies loads up to 500mA
and is available with preset output voltages. As illustrat-
ed in Figure 1, the MAX1819 consists of a 1.25V refer-
ence, error amplifier, P-channel pass transistor, and
internal feedback voltage-divider.
The 1.25V reference is connected to the error amplifier,
which compares this reference with the feedback volt-
age and amplifies the difference. If the feedback voltage
is lower than the reference voltage, the pass-transistor
(V
IN
PIN
A1
A2
A3
C1
C2
C3
500mA Low-Dropout Linear Regulator in UCSP
= (V
OUT
SHUTDOWN
NAME
SHDN
+ 500mV) or 2.5V, whichever is greater; SHDN = IN, C
GND
VOLTAGE
POK
OUT
SET
IN
V
P
OUT
OK
_______________________________________________________________________________________
Regulator Input. Supply voltage can range from 2.5V to 5.5V. Bypass with a 1µF capacitor to GND (see the
Capacitor Selection and Regulator Stability section).
Open-Drain POK Output. POK remains low while the output voltage (V
Connect a 100kΩ pullup resistor from POK to OUT to obtain an output voltage.
Active-Low Shutdown Input. A logic low reduces supply current below 15µA. In shutdown, the POK and
OUT are low. Connect to IN for normal operation.
Regulator Output. Sources up to 500mA. Bypass with a 3.3µF low-ESR capacitor to GND. Use a 4.7µF
capacitor for output voltages below 2V.
Voltage-Setting Input. Connect to GND for preset output. Connect to a resistive voltage-divider between
OUT and GND to set the output voltage between 1.25V and 5V.
Ground
Detailed Description
SHUTDOWN WAVEFORM
200µs/div
MAX1819 toc12
Typical Operating Characteristics (continued)
0
0
0
2V/div
IN
gate is pulled lower, which allows more current to pass
to the output and increases the output voltage. If the
feedback voltage is too high, the pass-transistor gate is
pulled up, allowing less current to pass to the output.
The output voltage is fed back through either an inter-
nal resistive-divider connected to OUT or an external
resistor network connected to SET. The Dual Mode
comparator examines V
path. If V
is used and the output is regulated to the factory-preset
voltage.
= 3.3µF, C
FUNCTION
1.40
1.39
1.38
1.37
1.36
1.35
SET
OUT
2.5
V
is below 50mV, the internal feedback path
= 3.3µF, T
OUT(NOM)
SHORT-CIRCUIT CURRENT LIMIT
3.0
vs. SUPPLY VOLTAGE
= 2V
SUPPLY VOLTAGE (V)
OUT
3.5
A
) is below the POK threshold.
= +25°C, unless otherwise noted)
SET
4.0
and selects the feedback
4.5
Pin Description
5.0
5.5
5