Micropower 300-mA CMOS Regulator With Error Flag/Power-On-Reset F

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Micropower 300-mA CMOS Regulator With Error Flag/Power-On-Reset F

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Si91822
Micropower 300-mA CMOS Regulator With Error Flag/Power-On-Reset
FEATURES
150-mV Dropout 300-mA Load Guaranteed 300-mA Output Current 600-mA Peak Output Current Capability Uses Ceramic Output Capacitor Fast Load Line Transient Response Only 100-mV(rms) Noise With Noise Bypass Capacitor 1-mA Maximum Shutdown Current Built-in Short Circuit Thermal Protection Out-Of-Regulation Error Flag (Power Good POR) Fixed1.215-V, 1.5-V, 1.8-V, 2.0-V, 2.5-V, 2.8-V, 3.0-V, 3.3-V, 5.0-V, Adjustable Output Voltage Options Other Output Voltages Available Special Order
APPLICATIONS
Cellular Phones Laptop Palm Computers PDA, Digital Still Cameras
DESCRIPTION
Si91822 300-mA CMOS (low dropout) voltage regulator. device features ultra ground current dropout voltage prolong battery life portable electronics. Si91822 offers line/load transient response ripple rejection superior that bipolar BiCMOS regulators. device designed maintain regulation while delivering 600-mA peak current. This useful systems that have high surge current upon turn-on. Si91822 designed drive lower cost ceramic, well tantalum, output capacitors. device guaranteed stable from maximum load current down 0-mA load. addition, external noise bypass capacitor connected device's CNOISE will lower LDO's output noise noise applications.
Si91822 also includes out-of-regulation error flag. When output voltage below nominal output voltage, error flag output goes low. capacitor connected device's delay pin, error flag output will generate delayed power-on-reset signal.
TYPICAL APPLICATIONS CIRCUITS
CNOISE DELAY
ERROR SENSE/ADJ VOUT
CNOISE DELAY
ERROR
VOUT
SENSE/ADJ VOUT
VOUT
Si91822
Si91822
FIGURE Fixed Output
CNOISE DELAY ERROR SENSE/ADJ VOUT
FIGURE Adjustable Output
ON/OFF VOUT
Si91822
FIGURE Noise, Full Features Application
Document Number: 71671 S-04932-Rev. 15-Oct-01 www.vishay.com
Si91822
ABSOLUTE MAXIMUM RATINGS
Input Voltage, Input Voltage, -0.3 Output Current, IOUT Continuous, Short Circuit Protected Output Voltage, VOUT -0.3 VO(nom) Maximum Junction Temperature, TJ(max) 150_C Storage Temperature, TSTG -55_C 150_C (Human Body Model) Power Dissipation (Package)b 8-Pin MSOP Thermal Impedance (QJA) 8-Pin MSOPa 130_C/W Notes Device mounted with leads soldered welded board. Derate mW/_C above 25_C
Stresses beyond those listed under "Absolute Maximum Ratings" cause permanent damage device. These stress ratings only, functional operation device these other conditions beyond those indicated operational sections specifications implied. Exposure absolute maximum rating conditions extended periods affect device reliability.
RECOMMENDED OPERATING RANGE
Input Voltage, Output Voltage, VOUT (Adjustable Version) 1.215 Input Voltage, COUT (ceramic, type) CNOISE (ceramic) COUT Range ("10%, type) COUT Operating Ambient Temperature, -40_C 85_C Operating Junction Temperature, -40_C 135_C
SPECIFICATIONS
Test Conditions Unless Otherwise Specified Parameter Symbol
VOUT(nom) IOUT COUT
Limits
85_C
Tempa
Minb
Typc
Maxb
Unit
Output Voltage Range Output Voltage Accuracy (Fixed Versions) Feedback Voltage (ADJ Version) VOUT
Adjustable Version IOUT
Full Room Full Room
1.215 -1.5 -2.5 1.191 1.179 1.215
1.239 1.251
VO(nom)
VADJ
Full From VOUT VOUT
Line Regulation (VADJ VOUT DVOUT Line Regulation VOUT VOUT
Full
-0.18
0.18
From IOUT
Full
-0.18
0.18
Room Room Room
Dropout Voltaged (@VOUT(nom) VOUT Dropout Voltaged (@VOUT(nom)
IOUT IOUT IOUT IOUT IOUT IOUT
Full Room Room Full Room Room 1000
Ground Current
IGND
Full Room 1500
1500
IOUT
Full
2800 Document Number: 71671 S-04932-Rev. 15-Oct-01
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Si91822
SPECIFICATIONS
Test Conditions Unless Otherwise Specified Parameter Symbol
VOUT(nom) IOUT COUT
Limits
85_C
Tempa
Minb
Typc
Maxa
Unit
Shutdown Supply Current Current Peak Output Current Output Noise Voltage
IIN(off) IADJ IO(peak)
VOUT 0.95 VOUT(nom), IOUT CNOISE CNOISE
Room Room Room Room Room Room Room Room Room Room Room Room
(rms)
Ripple Rejection
DVOUT/DVIN
IOUT
Dynamic Line Regulation Dynamic Load Regulation VOUT Turn-On-Time
DVO(line) DVO(load)
VOUT(nom) VOUT(nom) tR/tF IOUT IOUT tR/tF VOUT CNOISE CNOISE
Thermal Shutdown
Thermal Shutdown Junction Temp Thermal Hysteresis Short Circuit Current tJ(s/d) tHYST VOUT Room Room Room
Shutdown Input
Input Voltage VHYST High Regulator (Rising) Regulator (Falling) Regulator Regulator Full Full Room Room Full 0.01
Input Currente Shutdown Hysteresis
Error Output
Output High Leakage Output Voltageg Out-of-Regulation Error Flag Threshold Voltageg Hysteresis Delay Current Source IOFF VHYST IDELAY ERROR VOUT(nom) ISINK Full Full Full Room Room 0.93 VOUT 0.95 VOUT VOUT 0.01 0.97 VOUT
Notes Room 25_C, Full 85_C. algebraic convention whereby most negative value minimum most positive maximum. Typical values DESIGN ONLY, guaranteed subject production testing. Typical values dropout voltage VOUT measured VOUT while typical values dropout voltage VOUT measured VOUT Dropout voltage defined input output differential voltage which output voltage drops below output voltage measured with differential, provided that does drop below When VOUT(nom) less than output will regulation when VOUT(nom) greater than dropout voltage specified. device's shutdown includes typical 6-MW internal pull-down resistor connected ground. VOUT defined output voltage Error Output (Low) function guaranteed w2.0
Document Number: 71671 S-04932-Rev. 15-Oct-01
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Si91822
TIMING WAVEFORMS
VNOM 0.95 VNOM VOUT
ERROR
tDELAY
FIGURE Timing Diagram Power-Up
CONFIGURATION
MSOP-8
CNOISE DELAY
ERROR SENSE VOUT
View
DESCRIPTION
Number
Name
CNOISE DELAY VOUT SENSE ERROR
Function
Noise bypass pin. noise applications, 0.01-mF larger ceramic capacitor should connected from this ground. Capacitor connected from this ground will allow delayed power-on-reset signal ERROR (Pin output. Refer Figure Ground pin. Local ground CNOISE COUT. Input supply pin. Bypass this with 2.2-mF ceramic tantalum capacitor ground. Output voltage. Connect COUT between this ground. fixed output voltage versions, this should connected VOUT (Pin adjustable output voltage version, this voltage feedback sets output voltage external resistor divider. This open drain output error flag output which goes when VOUT drops below nominal voltage. This also provides power-on-reset signal capacitor connected DELAY pin. applying less than this pin, device will turned off. Connect this unused. Document Number: 71671 S-04932-Rev. 15-Oct-01
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Si91822
ORDERING INFORMATION
Part Number
Si91822DH-12-T1 Si91822DH-15-T1 Si91822DH-18-T1 Si91822DH-20-T1 Si91822DH-25-T1 Si91822DH-28-T1 Si91822DH-30-T1 Si91822DH-33-T1 Si91822DH-50-T1 Si91822DH-AD-T1
Marking
1822 1215 1822 1500 1822 1800 1822 2000 1822 2500 1822 2800 1822 3000 1822 3300 1822 5000
Voltage
1.215 1.50 1.80 2.00 2.50
Temperature
Package
Eval
85_C Si91822DB MSOP-8
Temperature Range
85_C
Board Type
Surface Mount
2.80 3.00 3.30 5.00
1822 Adjustable Additional voltage options available.
TYPICAL CHARACTERISTICS (INTERNALLY REGULATED, 25_C UNLESS NOTED)
Dropout Voltage Load Current
VOUT RLOAD 16.5 DROP (mV) ILOAD (mA)
Dropout Characteristic
Dropout Voltage Temperature
DROP (mV) IOUT IOUT Junction Temperature (_C) VOUT IOUT IOUT Dropout Voltage (mV)
Dropout Voltage VOUT
IOUT IOUT
IOUT VOUT
Document Number: 71671 S-04932-Rev. 15-Oct-01
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Si91822
TYPICAL CHARACTERISTICS (INTERNALLY REGULATED, 25_C UNLESS NOTED)
Normalized Output Voltage Load Current
0.30 0.15 0.00 -0.4 -0.15 -0.30 -0.45 -0.60 -0.75 Load Current (mA) -1.0 -0.0 IOUT -0.2 IOUT
Normalized VOUT Temperature
Output Voltage
-0.6 IOUT -0.8 IOUT IOUT
-1.2
Junction Temperature (_C)
Current Load Current
VOUT -0.3
Load Current Input Voltage
-0.6 25_C -0.9 85_C 25_C -1.2 -40_C
-1.5 Load Current (mA)
Input Voltage
Power Supply Rejection
COUT ILOAD 2000
Current Temperature Load
VOUT IOUT 1500
Gain (dB)
IOUT 1000
IOUT
1000 10000 100000 1000000 Frequency (Hz)
Junction Temperature (_C)
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Document Number: 71671 S-04932-Rev. 15-Oct-01
Si91822
TYPICAL WAVEFORMS
Load Transient Response-1 Load Transient Response-2
VOUT mV/div VOUT mV/div ILOAD mA/div ILOAD mA/div
5.00 ms/div
VOUT COUT ILOAD trise msec
5.00 ms/div
VOUT COUT ILOAD tfall msec
Load Transient Response-3
Load Transient Response-4
VOUT mV/div VOUT mV/div ILOAD mA/div ILOAD mA/div
5.00 ms/div
VOUT COUT ILOAD trise msec
5.00 ms/div
VOUT COUT ILOAD tfall msec
LineTransient Response-1
VOUT V/div V/div
LineTransient Respons-2
VOUT mV/div
VOUT mV/div
5.00 ms/div
VINSTEP VOUT COUT ILOAD trise msec
5.00 ms/div
VINSTEP VOUT COUT ILOAD tfall msec
Document Number: 71671 S-04932-Rev. 15-Oct-01
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Si91822
TYPICAL WAVEFORMS
Turn-On Sequence Turn-Off Sequence
CH-3 V/div V/div VOUT V/div VOUT CH-1 V/div
Cdelay V/div ERROR V/div
Cdelay CH-4 V/div ERROR CH-2 V/div VOUT Cdelay CNOISE ILOAD 5.00 ms/div VOUT Cdelay CNOISE ILOAD
10.00 ms/div
Output Noise
10.0
Noise Spectrum
mV/div
0.01 ms/div VOUT IOUT CNOISE VOUT V/10 CNOISE
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Document Number: 71671 S-04932-Rev. 15-Oct-01
Si91822
BLOCK DIAGRAMS
Switches shown device normal operating mode HIGH)
SENSE
CNOISE
RFB2 RFB1 CDELAY ERROR 1.215 VREF COUT REXT VOUT
FIGURE 300-mA CMOS Regulator (Fixed Output)
CNOISE
VADJ
CDELAY ERROR 1.215 VREF COUT REXT VOUT
FIGURE 300-mA CMOS Regulator (Adjustable Output)
Document Number: 71671 S-04932-Rev. 15-Oct-01
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Si91822
DETAILED DESCRIPTION
Si91822 drop out, quiescent current, very linear regulator family with very fast transient response. primarily designed battery powered applications where battery time premium. quiescent current allows extended standby time while drop voltage enables system fully utilize battery power before recharge. Si91822 very fast regulator with bandwidth exceeding while maintaining quiescent current light load conditions. With this bandwidth, Si91822 fastest available today. Si91822 stable with output capacitor type from 10.0 However, ceramic capacitors recommended best output noise transient performance. input supply pin. bypass capacitor this critical long input supply enough source impedance. practical circuits, 1.0-mF larger ceramic capacitor recommended. When source impedance enough and/or source several inches from Si91822, then larger input bypass capacitor needed. required that equivalent impedance (source impedance, wire, trace impedance parallel with input bypass capacitor impedance) must smaller than input impedance Si91822 stable operation. When source impedance, wire, trace impedance unknown, recommended that input bypass capacitor used value that equal greater than output capacitor. VOUT VOUT output voltage regulator. Connect bypass capacitor from VOUT ground. output capacitor value from 10.0 ceramic capacitor with dielectric type recommended best output noise, line transient, load transient performance. Ground common ground connection VOUT. also local ground connection CNOISE, DELAY, SENSE ADJ, SENSE SENSE used sense output voltage. Connect SENSE VOUT fixed voltage version. adjustable output version, resistor divider connect from VOUT from ground. should 25-kW 150-kW range power consumption, while maintaining adequate noise immunity.
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formula below calculates value given desired output voltage value,
VADJ VADJ
VADJ nominally 1.215
SHUTDOWN (SD) controls turning Si91822. VOUT guaranteed when voltage equals greater than VOUT guaranteed when theSD voltage equals less than During shutdown mode, Si91822 will draw less than 2-mA current from source. automatically turn VOUT whenever input applied, VIN. ERROR ERROR open drain output that goes when VOUT less than normal value. with open drain output, external pull resistor needed. When capacitor connected from DELAY GROUND, error signal transition from high delayed (see Delay section). This delayed error signal used power-on reset signal application system. (Refer Figure ERROR disconnected used. DELAY capacitor from DELAY GROUND sets time delay ERROR going from high state. time delay calculated using following formula:
Tdelay
VADJ Cdelay Idelay
DELAY should open circuit used. CNOISE noise application, connect high frequency ceramic capacitor from CNOISE ground. 0.01-mF 0.1-mF recommended.
Document Number: 71671 S-04932-Rev. 15-Oct-01

Micropower 300-mA CMOS Regulator With Error Flag/Power-On-Reset F

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