SI9185 Datasheet, PDF (1/12 Pages) Vishay Siliconix – Micropower 500-mA CMOS LDO Regulator

Si9185
Vishay Siliconix
Micropower 500-mA CMOS LDO Regulator
With Error Flag/Power-On-Reset
FEATURES
D Input Voltage 2 V to 6 V
D Low 150-mV Dropout at 500-mA Load
D Guaranteed 500-mA Output Current
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)
D Fixed 1.215-V, 1.5-V, 1.8-V, 2.0-V, 2.5-V, 2.8-V, 2.9-V,
3.0-V, 3.3-V, 5.0-V, or Adjustable Output Voltage
Options
DESCRIPTION
The Si9185 is a 500-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 Si9185 offers line/load transient response and ripple
rejection superior to that of bipolar or BiCMOS LDO regulators,
and is designed to drive lower cost ceramic, as well as
tantalum, output capacitors. An external noise bypass
capacitor connected to the device’s C_NOISE pin will lower the
LDO’s output noise for low noise applications. The Si9185 also
includes an out-of-regulation error flag. If a capacitor is
TYPICAL APPLICATIONS CIRCUITS
D Other Output Voltages Available by Special Order
D 1.1-W Power Dissipation
D Thin, Thermally Enhanced MLP33 PowerPAKt
Package
APPLICATIONS
D Laptop and Palm Computers
D Desktop Computers
D Cellular Phones
D PDA, Digital Still Cameras
connected to the device’s delay pin, the error flag output pin will
generate a delayed power-on-reset signal. The device is
guaranteed stable from maximum load current down to 0-mA
load.
The Si9185 is available in a MLP33 PowerPAK package. This
allows enhanced heat transfer to the PC board. The Si9185 is
specified to operate over the industrial temperature range of
–40_C to +85_C.
V_IN
2.2 mF
GND
1 _CNOISE
2 _DELAY
SD ⁸
ERROR ⁷
3 _{GND SENSE/ADJ} 6
4 _VIN
V_OUT ⁵
Si9185
V_OUT
2.2 mF
V_IN
2.2 mF
GND
FIGURE 1. Fixed Output
0.1 mF
0.1 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
Si9185
1 _CNOISE
2 _DELAY
SD ⁸
ERROR ⁷
3 _{GND SENSE/ADJ} 6
4 _VIN
V_OUT ⁵
Si9185
FIGURE 2. Adjustable Output
ON/OFF
1 MW
POR
V_OUT
2.2 mF
Document Number: 71765
S-20641—Rev. B, 06-May-02
FIGURE 3. Low Noise, Full Features Application
V_OUT
2.2 mF
www.vishay.com
1