SI9181DQ-20-T1-E3 VISHAY [Vishay Siliconix], SI9181DQ-20-T1-E3 Datasheet

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SI9181DQ-20-T1-E3

Manufacturer Part Number
SI9181DQ-20-T1-E3
Description
Micropower 350-mA CMOS LDO Regulator With Error Flag/Power-On-Reset
Manufacturer
VISHAY [Vishay Siliconix]
Datasheet
1.SI9181DQ-20-T1-E3.pdf (10 pages)
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
Document Number: 71119
S-40694—Rev. D, 19-Apr-04
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
D 1-mA Maximum Shutdown Current
D Built-in Short Circuit and Thermal Protection
D Out-Of-Regulation Error Flag (Power Good or POR)
TYPICAL APPLICATIONS CIRCUITS
GND
Capacitor
V
IN
2.2 mF
FIGURE 1. Fixed Output
1
2
3
4
C
DELAY
GND
V
IN
NOISE
Micropower 350-mA CMOS LDO Regulator
Si9181
SENSE/ADJ
GND
V
IN
ERROR
2.2 mF
V
0.1 mF
With Error Flag/Power-On-Reset
OUT
SD
8
7
6
5
FIGURE 3. Low Noise, Full Features Application
0.1 mF
2.2 mF
V
OUT
1
2
3
4
C
DELAY
GND SENSE/ADJ
V
IN
NOISE
Si9181
ERROR
V
capacitor connected to the device’s C
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.
GND
OUT
D Fixed 1.5-V, 1.8-V, 2.0-V, 2.5-V, 2.8-V, 2.85-V, 2.9 V,
D Other Output Voltages Available by Special Order
APPLICATIONS
D Cellular Phones
D Laptop and Palm Computers
D PDA, Digital Still Cameras
SD
V
IN
2.2 mF
3.0-V, 3.3-V, 5.0-V, or Adjustable Output Voltage
Options
8
7
6
5
2.2 mF
FIGURE 2. Adjustable Output
1
2
3
4
1 MW
C
DELAY
GND SENSE/ADJ
V
IN
NOISE
Si9181
ON/OFF
POR
V
OUT
ERROR
V
OUT
SD
Vishay Siliconix
8
7
6
5
NOISE
pin will lower the
www.vishay.com
Si9181
2.2 mF
V
OUT
1

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SI9181DQ-20-T1-E3 Summary of contents

Page 1

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 ...

Page 2

Si9181 Vishay Siliconix ABSOLUTE MAXIMUM RATINGS Input Voltage ...

Page 3

SPECIFICATIONS Parameter Symbol Shutdown Supply Current I IN(off) ADJ Pin Current I ADJ Peak Output Current I O(peak) Output Noise Voltage Output Noise Voltage Ripple Rejection /DV OUT OUT Dynamic Line Regulation DV ...

Page 4

Si9181 Vishay Siliconix TIMING WAVEFORMS PIN CONFIGURATION C NOISE DELAY GND PIN DESCRIPTION Pin Number Name Noise bypass pin. For low noise applications, a 0.01-mF or larger ceramic capacitor should be connected from this pin 1 C NOISE to ground. ...

Page 5

... Si9181DQ-20-T1—E3 Si9181DQ-25-T1 Si9181DQ-25-T1—E3 Si9181DQ-28-T1 Si9181DQ-28-T1—E3 Si9181DQ-285-T1 Si9181DQ-285-T1—E3 Si9181DQ-29-T1 Si9181DQ-29-T1—E3 Si9181DQ-30-T1 Si9181DQ-30-T1—E3 Si9181DQ-33-T1 Si9181DQ-33-T1—E3 Si9181DQ-50-T1 Si9181DQ-50-T1—E3 Si9181DQ-AD-T1 Si9181DQ-AD-T1—E3 * Additional voltage options are available. Eval Kit Si9181DB TYPICAL CHARACTERISTICS (INTERNALLY REGULATED, 25_C UNLESS NOTED) Dropout Voltage vs ...

Page 6

Si9181 Vishay Siliconix TYPICAL CHARACTERISTICS (INTERNALLY REGULATED, 25_C UNLESS NOTED) Normalized Output Voltage vs. Load Current 0.30 0.15 0.00 −0.15 −0.30 −0.45 −0.60 −0. 100 150 200 Load Current (mA) GND Current vs. Load Current 0 ...

Page 7

TYPICAL WAVEFORMS Load Transient Response-1 V OUT 10 mV/div I LOAD 100 mA/div 5.00 ms/div V = 3.3 V OUT C = 2.2 mF OUT 150 mA LOAD msec rise Load Transient Response-3 ...

Page 8

Si9181 Vishay Siliconix TYPICAL WAVEFORMS Turn-On Sequence V 2 V/div V/div OUT C 2 V/div delay ERROR 2 V/div 10.00 ms/div 3.3 V OUT C = 0.1 mF delay C ...

Page 9

BLOCK DIAGRAMS 6 SENSE 2 RFB2 OFF 6 MW RFB1 1.215 V 3 GND FIGURE 5. 350-mA CMOS LDO Regulator (Fixed Output) 6 ADJ 2.2 mF ...

Page 10

Si9181 Vishay Siliconix DETAILED DESCRIPTION The Si9181 is a low drop out, low quiescent current, and very linear regulator family with very fast transient response primarily designed for battery powered applications where battery run time ...

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