ISL78302A_14 Datasheet, PDF (1/11 Pages) Intersil Corporation – Dual LDO with Low Noise, Very High PSRR and Low IQ

Dual LDO with Low Noise, Very High PSRR and Low I_Q
ISL78302A
Features
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 rated. The ISL78302A is rated
for the automotive temperature range (-40°C to +105°C).
• 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 @ 100µA (1.5V)
• Very High PSRR: 90dB @ 1kHz
• Extremely Low Quiescent Current: 47µA (Both LDOs Active)
• Wide Input Voltage Capability: 2.3V to 6.5V
• Low Dropout Voltage: Typically 230mV @ 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 Tested
Applications
• Radio Receivers
• Camera Modules
• GPS/Navigation
• Infotainment Systems
VIN (2.3 TO 6.5V)
ON
ENABLE1
OFF ^ON
ENABLE2
OFF
ISL78302A
1
VIN
10
VO1
2
EN1
9
VO2
3
EN2
4
CBYP
8
POR2
7
POR1
5
CPOR
6
GND
C1 C2 C3
C4 C5
V_OUT1
V_OUT2 OK
V_OUT2
V_OUT2 TOO LOW
V_OUT1 OK
RESET2
(200ms DELAY,
C3 = 0.01µF)
RESET1
V_OUT1 TOO LOW (2ms DELAY)
December 23, 2013
FN7932.1
C1, C4, C5: 1µF X5R CERAMIC CAPACITOR
C2: 0.1µF X7R CERAMIC CAPACITOR
C3: 0.01µF X7R CERAMIC CAPACITOR
FIGURE 1. TYPICAL APPLICATION
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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