1
DATASHEET
Dual LDO with Low Noise, Very High PSRR and Low I
Q
ISL78302A
ISL78302A is a high-performance dual LDO capable of
sourcing 300mA current from each output. It has a low
standby current and very high PSRR and is stable with output
capacitance of 1µF to 10µF with ESR of up to 200mΩ.
The device integrates an individual Power-On Reset (POR)
function for each output. The POR delay for VO2 can be
externally programmed by connecting a timing capacitor to the
CPOR pin. The POR delay for VO1 is internally fixed at
approximately 2ms. A reference bypass pin is also provided for
connecting a noise-filtering capacitor for low noise and
high-PSRR applications.
The quiescent current is typically only 47µA with both LDOs
enabled and active. Separate Enable pins control each
individual LDO output. When both Enable pins are low, the
device is in shutdown, typically drawing less than 0.3µA.
The ISL78302A is AEC-Q100 qualified. The ISL78302A is rated
for the automotive temperature range (-40°C to +105°C).
Features
• Integrates Two 300mA High-performance LDOs
• Excellent Transient Response to Large Current Steps
• ±1.8% Accuracy Over All Operating Conditions
• Excellent Load Regulation: < 0.1% Voltage Change Across
Full Range of Load Current
• Low Output Noise: Typically 30µV
RMS
at 100µA (1.5V)
• Very High PSRR: 90dB at 1kHz
• Extremely Low Quiescent Current: 47µA (Both LDOs Active)
• Wide Input Voltage Capability: 2.3V to 6.5V
• Low Dropout Voltage: Typically 230mV at 300mA
• Stable with 1µF to 10µF Ceramic Capacitors
• Separate Enable and POR Pins for Each LDO
• Soft-start and Staged Turn-on to Limit Input Current Surge
During Enable
• Current Limit and Overheat Protection
• Tiny 10 Ld 3mmx3mm DFN Package
• -40°C to +105°C Operating Temperature Range
• Pb-free (RoHS Compliant)
• AEC-Q100 Qualified
Applications
•Radio Receivers
• Camera Modules
• GPS/Navigation
•Infotainment Systems
C1, C4, C5: 1µF X5R CERAMIC CAPACITOR
C2: 0.1µF X7R CERAMIC CAPACITOR
ISL78302A
VIN
EN1
EN2
CBYP
CPOR
VO1
VO2
POR2
POR1
GND
10
9
8
7
6
1
2
3
4
5
VIN (2.3 TO 6.5V)
ENABLE1
ENABLE2
V
OUT1
V
OUT2
RESET1
RESET2
C1 C2 C3 C4 C5
C3: 0.01µF X7R CERAMIC CAPACITOR
OFF
ON
OFF
ON
(200ms DELAY,
C3 = 0.01µF)
(2ms DELAY)
V
OUT2
TOO LOW
V
OUT2
OK
V
OUT1
TOO LOW
V
OUT1
OK
FIGURE 1. TYPICAL APPLICATION
December 22, 2015
FN7932.2
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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