ISL9000_06 Datasheet, PDF (1/11 Pages) Intersil Corporation – Dual LDO with Low Noise, Very High PSRR, and Low IQ

®
Data Sheet
August 2, 2006
ISL9000
FN9217.3
Dual LDO with Low Noise, Very High
PSRR, and Low I_Q
ISL9000 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 42μA with both LDO’s
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 0.1μA.
Several combinations of voltage outputs are standard.
Others are available on request. Output voltage options for
each LDO range from 1.2V to 3.6V.
Pinout
ISL9000
10 LD 3X3 DFN
TOP VIEW
VIN 1
EN1 2
EN2 3
CBYP 4
CPOR ⁵
10 VO1
9 VO2
8 _POR2
7 POR1
6 GND
Features
• Integrates two 300mA high performance LDO’s
• 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 30μVrms @ 100μA (1.5V)
• Very high PSRR: 90dB @ 1kHz
• Extremely low quiescent current: 42μA (both LDOs active)
• Wide input voltage capability: 2.3V to 6.5V
• Low dropout voltage: typically 200mV @ 300mA
• Stable with 1μF-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 3x3mm DFN package
• -40°C to +85°C operating temperature range
• Pb-free plus anneal available (RoHS compliant)
Applications
• PDAs, Cell Phones and Smart Phones
• Portable Instruments, MP3 Players
• Handheld Devices including Medical Handhelds
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CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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