SI9181 Datasheet, PDF (1/10 Pages) Vishay Siliconix – Micropower 350-mA CMOS LDO Regulator With Error Flag/Power-On-Reset

Si9181
Vishay Siliconix
Micropower 350-mA CMOS LDO Regulator
With Error Flag/Power-On-Reset
FEATURES
D Low 150-mV Dropout at 350-mA Load
D Guaranteed 350-mA Output Current
D 600-mA Peak Output Current Capability
D Uses Low ESR Ceramic Output Capacitor
D Fast Load and Line Transient Response
D Only 100-mV(rms) Noise With Noise Bypass
Capacitor
D 1-mA Maximum Shutdown Current
D Built-in Short Circuit and Thermal Protection
D Out-Of-Regulation Error Flag (Power Good or POR)
DESCRIPTION
The Si9181 is a 350-mA CMOS LDO (low dropout) voltage
regulator. The device features ultra low ground current and
dropout voltage to prolong battery life in portable electronics.
The Si9181 offers line/load transient response and ripple
rejection superior to that of bipolar or BiCMOS LDO regulators.
The device is designed to maintain regulation while delivering
600-mA peak current. This is useful for systems that have high
surge current upon turn-on. The Si9181 is designed to drive
the lower cost ceramic, as well as tantalum, output capacitors.
The device is guaranteed stable from maximum load current
down to 0-mA load. In addition, an external noise bypass
D Fixed 1.5-V, 1.8-V, 2.0-V, 2.5-V, 2.8-V, 2.85-V, 2.9 V,
3.0-V, 3.3-V, 5.0-V, or Adjustable Output Voltage
Options
D Other Output Voltages Available by Special Order
APPLICATIONS
D Cellular Phones
D Laptop and Palm Computers
D PDA, Digital Still Cameras
capacitor connected to the device’s C_NOISE pin will lower the
LDO’s output noise for low noise applications.
The Si9181 also includes an out-of-regulation error flag. When
the output voltage is 5% below its nominal output voltage, the
error flag output goes low. If a capacitor is connected to the
device’s delay pin, the error flag output pin will generate a
delayed power-on-reset signal.
The Si9181 is available in both standard and lead (Pb)-free
packages.
TYPICAL APPLICATIONS CIRCUITS
V_IN
2.2 mF
GND
1 _CNOISE
2 _DELAY
SD ⁸
ERROR ⁷
3 _{GND SENSE/ADJ} 6
4 _VIN
V_OUT ⁵
Si9181
FIGURE 1. Fixed Output
V_OUT
2.2 mF
V_IN
2.2 mF
GND
1 _CNOISE
2 _DELAY
SD ⁸
ERROR ⁷
3 _{GND SENSE/ADJ} 6
4 _VIN
V_OUT ⁵
Si9181
FIGURE 2. Adjustable Output
0.1 mF
V_IN
2.2 mF
GND
0.1 mF
1 _CNOISE
2 _DELAY
SD ⁸
ERROR ⁷
3 _{GND SENSE/ADJ} 6
4 _VIN
V_OUT ⁵
Si9181
ON/OFF
1 MW
POR
V_OUT
2.2 mF
Document Number: 71119
S-40694—Rev. D, 19-Apr-04
FIGURE 3. Low Noise, Full Features Application
V_OUT
2.2 mF
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