Si91822
Vishay Siliconix
Micropower 300-mA CMOS LDO Regulator
With Error Flag/Power-On-Reset
FEATURES
Low 150-mV Dropout at 300-mA Load
Guaranteed 300-mA Output Current
600-mA Peak Output Current Capability
Uses Low ESR Ceramic Output Capacitor
Fast Load and Line Transient Response
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
D
D
D
D
D
D
Fixed1.215-V, 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
DESCRIPTION
The Si91822 is a 300-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 Si91822 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 Si91822 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
capacitor connected to the device’s C
NOISE
pin will lower the
LDO’s output noise for low noise applications.
The Si91822 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 Si91822 is available in both standard and lead (Pb)-free
MSOP-8 packages and is specified to operate over the
industrial temperature range of
−40
_C
to 85
_C.
TYPICAL APPLICATIONS CIRCUITS
1
2
3
V
IN
2.2
mF
GND
4
C
NOISE
DELAY
GND
V
IN
SD
ERROR
SENSE/ADJ
V
OUT
8
7
6
5
2.2
mF
V
OUT
V
IN
2.2
mF
GND
1
2
3
4
C
NOISE
DELAY
GND
V
IN
SD
ERROR
SENSE/ADJ
V
OUT
8
7
6
5
V
OUT
2.2
mF
Si91822
FIGURE 1.
Fixed Output
Si91822
FIGURE 2.
Adjustable Output
1
0.1
mF
2
0.1
mF
3
4
C
NOISE
DELAY
GND
V
IN
SD
ERROR
8
7
6
5
2.2
mF
1 MW
ON/OFF
POR
V
OUT
SENSE/ADJ
V
OUT
V
IN
2.2
mF
GND
Si91822
FIGURE 3.
Low Noise, Full Features Application
Document Number: 71671
S-41221—Rev. D, 28-Jun-04
www.vishay.com
1
Si91822
Vishay Siliconix
ABSOLUTE MAXIMUM RATINGS
Input Voltage, V
IN
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.5 V
SD Input Voltage, V
SD
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
−0.3
V to V
IN
Output Current, I
OUT
. . . . . . . . 300 mA Continuous, Short Circuit Protected
Output Voltage, V
OUT
. . . . . . . . . . . . . . . . . . . . . . . .
−0.3
V to V
O(nom)
+ 0.3 V
Maximum Junction Temperature, T
J(max)
. . . . . . . . . . . . . . . . . . . . . . . 150_C
Storage Temperature, T
STG
. . . . . . . . . . . . . . . . . . . . . . . . . .
−55_C
to 150_C
ESD (Human Body Model) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 kV
Power Dissipation (Package)b
8-Pin MSOP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 846 mW
Thermal Impedance (Q
JA
)
8-Pin MSOP
a
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130_C/W
Notes
a. Device mounted with all leads soldered or welded to PC board.
b. Derate 7.7 mW/_C above T
A
= 25_C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation
of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect device reliability.
RECOMMENDED OPERATING RANGE
Input Voltage, V
IN
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 V to 6 V
Output Voltage, V
OUT
(Adjustable Version) . . . . . . . . . . . . . . . 1.215 V to 5 V
SD Input Voltage, V
SD
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 V to V
IN
C
IN
= 2.2
mF,
C
OUT
= 2.2
mF
(ceramic, X5R or X7R type) , C
NOISE
= 0.1
mF
(ceramic)
C
OUT
Range = 1
mF
to 10
mF
("10%, x5R or x7R type)
C
IN
w
C
OUT
Operating Ambient Temperature, T
A
. . . . . . . . . . . . . . . . . . . .
−40_C
to 85_C
Operating Junction Temperature, T
J
. . . . . . . . . . . . . . . . . . .
−40_C
to 135_C
SPECIFICATIONS
Test Conditions
Unless Otherwise Specified
Parameter
Output Voltage Range
Output Voltage Accuracy
(Fixed Versions)
Feedback Voltage (ADJ Version)
Line Regulation (V
ADJ
v
V
OUT
v
4 V)
Line Regulation (4 V
v
V
OUT
v
5 V)
V
OUT
Limits
−40
to 85_C
Symbol
V
IN
= V
OUT(nom)
+ 1 V I
OUT
= 1 mA
V,
A
C
IN
= 2.2
mF,
C
OUT
= 2.2
mF,
V
SD
= 1.5 V
Temp
a
Full
Room
Full
Room
Full
Min
b
1.215
−1.5
−2.5
1.191
1.179
−0.18
−0.18
Typ
c
Max
b
5
1.5
2.5
Unit
V
% V
O(
O(nom)
)
V
Adjustable Version
1 mA
v
I
OUT
v
300 mA
V
ADJ
DV
OUT
V
IN
100
V
OUT
From V
IN
= V
OUT
+ 1 V to V
OUT
+ 2 V
From V
IN
= 5.5 V to 6 V
I
OUT
= 10 mA
I
OUT
= 200 mA
V
IN
−
V
OUT
I
OUT
= 300 mA
I
OUT
= 200 mA
I
OUT
= 300 mA
I
OUT
= 0 mA
1.215
1.239
1.251
0.18
0.18
Full
Full
Room
Room
Room
Full
Room
Room
Full
Room
Room
Full
Room
Full
Room
Room
Room
Room
Room
Room
Room
Room
%/V
5
85
150
170
290
150
1000
20
180
350
500
250
375
525
mV
Dropout Voltage
d
(@V
OUT(nom)
w
2 V)
(
)
Dropout V lt
D
t Voltage
d
(@V
OUT(nom)
t
2 V, V
IN
w
2 V)
Ground Pin Current
I
GND
I
OUT
= 200 mA
I
OUT
= 300 mA
1500
1500
2800
0.1
5
600
200
100
60
60
40
1
100
m
mA
Shutdown Supply Current
ADJ Pin Current
Peak Output Current
Output Noise Voltage
I
IN(off)
I
ADJ
I
O(peak)
e
N
V
SD
= 0 V
ADJ = 1.2 V
V
OUT
w
0.95 x V
OUT(nom)
, t
pw
= 2 ms
BW = 50 Hz to 100
kHz I
OUT
= 150 mA
I
OUT
= 150 mA
w/o C
NOISE
C
NOISE
= 0.1
mF
f = 1 kHz
f = 10 kHz
f = 100 kHz
mA
nA
mA
mV
(rms)
Ripple Rejection
pp
j
DV
OUT
/DV
IN
dB
www.vishay.com
2
Document Number: 71671
S-41221—Rev. D, 28-Jun-04
Si91822
Vishay Siliconix
SPECIFICATIONS
Test Conditions
Unless Otherwise Specified
Parameter
Symbol
V
IN
= V
OUT(nom)
+ 1 V, I
OUT
= 1 mA
C
IN
= 2.2
mF,
C
OUT
= 2.2
mF,
V
SD
= 1.5 V
Limits
−40
to 85_C
Temp
a
Min
b
Typ
c
Max
b
Unit
Dynamic Line Regulation
Dynamic Load Regulation
V
OUT
Turn On Time
Turn-On-Time
DV
O(line)
DV
O(load)
t
ON
V
IN
: V
OUT(nom)
+ 1 V to V
OUT(nom)
+ 2 V
t
R
/t
F
= 5
ms,
I
OUT
= 300 mA
I
OUT
: 1 mA to 150 mA, t
R
/t
F
= 2
ms
V
IN
= 4.3 V
V
OUT
= 3.3 V
w/o C
NOISE
Cap
C
NOISE
= 0.1
mF
Room
Room
Room
Room
10
30
5
2
mV
ms
mS
Thermal Shutdown
Thermal Shutdown Junction Temp
Thermal Hysteresis
Short Circuit Current
t
J(s/d)
t
HYST
I
SC
V
IH
V
IL
I
IH
I
IL
V
HYST
V
OUT
= 0 V
High = Regulator ON (Rising)
Low = Regulator OFF (Falling)
V
SD
= 0 V, Regulator OFF
V
SD
= 6 V, Regulator ON
Room
Room
Room
165
20
800
_C
mA
Shutdown Input
SD Input Voltage
SD Input Current
e
Shutdown Hysteresis
Full
Full
Room
Room
Full
0.01
1.0
100
1.5
V
IN
0.4
V
mA
mV
Error Output
Output High Leakage
Output Low
Voltage
g
Out-of-Regulation Error Flag Threshold
Voltage (Rising)
g
Hysteresis
g
Delay Pin Current Source
I
OFF
V
OL
V
TH
V
HYST
I
DELAY
ERROR = V
OUT(nom)
I
SINK
= 2 mA
Full
Full
Full
Room
Room
1.2
0.93 x
V
OUT
0.95 x
V
OUT
2% x
V
OUT
2.2
3.0
mA
0.01
2
0.4
0.97 x
V
OUT
V
mA
Notes
a. Room = 25_C, Full =
−40
to 85_C.
b. The algebraic convention whereby the most negative value is a minimum and the most positive a maximum.
c. Typical values are for DESIGN AID ONLY, not guaranteed nor subject to production testing. Typical values for dropout voltage at V
OUT
w
2 V are measured at
V
OUT
= 3.3 V, while typical values for dropout voltage at V
OUT
< 2 V are measured at V
OUT
= 1.8 V.
d. Dropout voltage is defined as the input to output differential voltage at which the output voltage drops 2% below the output voltage measured with a 1-V
differential, provided that V
IN
does not not drop below 2.0 V. When V
OUT(nom)
is less than 2.0 V, the output will be in regulation when 2.0 V
−
V
OUT(nom)
is
greater than the dropout voltage specified.
e. The device’s shutdown pin includes a typical 6-MW internal pull-down resistor connected to ground.
f.
V
OUT
is defined as the output voltage of the DUT at 1 mA.
g. The Error Output (Low) function is guaranteed for V
IN
w2.0
V.
TIMING WAVEFORMS
V
IN
t
ON
V
NOM
0.95 V
NOM
V
OUT
ERROR
t
DELAY
FIGURE 4.
Timing Diagram for Power-Up
Document Number: 71671
S-41221—Rev. D, 28-Jun-04
www.vishay.com
3
Si91822
Vishay Siliconix
PIN CONFIGURATION
MSOP-8
C
NOISE
DELAY
GND
V
IN
1
2
3
4
8
7
6
5
SD
ERROR
SENSE or ADJ
V
OUT
Top View
PIN DESCRIPTION
Pin Number
1
2
3
4
5
6
7
8
Name
C
NOISE
DELAY
GND
V
IN
V
OUT
SENSE or ADJ
ERROR
SD
Function
Noise bypass pin. For low noise applications, a 0.01-mF or larger ceramic capacitor should be connected
from this pin to ground.
Capacitor connected from this pin to ground will allow a delayed power-on-reset signal at the ERROR (Pin
7) output. Refer to Figure 4.
Ground pin. Local ground for C
NOISE
and C
OUT
.
Input supply pin. Bypass this pin with a 2.2-mF ceramic or tantalum capacitor to ground.
Output voltage. Connect C
OUT
between this pin and ground.
For fixed output voltage versions, this pin should be connected to V
OUT
(Pin 5). For adjustable output
voltage version, this voltage feedback pin sets the output voltage via an external resistor divider.
This open drain output is an error flag output which goes low when V
OUT
drops 5% below its nominal
voltage. This pin also provides a power-on-reset signal if a capacitor is connected to the DELAY pin.
By applying less than 0.4 V to this pin, the device will be turned off. Connect this pin to V
IN
if unused.
ORDERING INFORMATION
Standard
Part Number
Si91822DH-12-T1
Si91822DH-15-T1
Si91822DH-18-T1
Si91822DH-20-T1
Si91822DH-25-T1
Si91822DH-28-T1
Si91822DH-285-T1
Si91822DH-29-T1
Si91822DH-30-T1
Si91822DH-33-T1
Si91822DH-50-T1
Si91822DH-AD-T1
Lead Free
Part Number
Si91822DH-12-T1—E3
Si91822DH-15-T1—E3
Si91822DH-18-T1—E3
Si91822DH-20-T1—E3
Si91822DH-25-T1—E3
Si91822DH-28-T1—E3
Si91822DH-285—E3
Si91822DH-29-T1—E3
Si91822DH-30-T1—E3
Si91822DH-33-T1—E3
Si91822DH-50-T1—E3
Si91822DH-AD-T1—E3
Marking
1822
1215
1822
1500
1822
1800
1822
2000
1822
2500
1822
2800
1822
285A
1822
2900
1822
3000
1822
3300
1822
5000
1822
ADJ
Voltage
1.215 V
1.50 V
1.80 V
2.00 V
2.50 V
2.80 V
2.85 V
2.9 V
3.00 V
3.30 V
5.00 V
Adjustable
Temperature
Package
−40
to 85_C
40
MSOP-8
MSOP 8
Additional voltage options are available.
Eval Kit
Si91822DB
www.vishay.com
Temperature Range
−40
to 85_C
Board Type
Surface Mount
Document Number: 71671
S-41221—Rev. D, 28-Jun-04
4
Si91822
Vishay Siliconix
TYPICAL CHARACTERISTICS (INTERNALLY REGULATED, 25_C UNLESS NOTED)
Dropout Voltage vs. Load Current
300
250
200
V
OUT
(V)
150
100
50
0
0
100
200
300
I
LOAD
(mA)
400
500
600
V
OUT
= 3.3 V
3.5
3.0
R
LOAD
= 16.5
W
2.5
2.0
1.5
1.0
0.5
0.0
0
1
2
3
V
IN
(V)
300
V
OUT
= 3.3 V
I
OUT
= 350 mA
I
OUT
= 300 mA
Dropout Voltage (mV)
250
200
I
OUT
= 350 mA
150
100
50
I
OUT
= 10 mA
I
OUT
= 0 mA
−25
0
25
50
75
100
Junction Temperature (_C)
125
150
I
OUT
= 10 mA
0
1.0
1.5
2.0
2.5
3.0
V
OUT
3.5
4.0
4.5
5.0
I
OUT
= 300 mA
4
5
6
Dropout Characteristic
V
DROP
(mV)
Dropout Voltage vs. Temperature
200
175
150
V
DROP
(mV)
125
100
75
50
25
0
−50
Dropout Voltage vs. V
OUT
Normalized Output Voltage vs. Load Current
0.30
0.15
0.00
−0.15
−0.30
−0.45
−0.60
−0.75
0
50
100
150
200
250
300
350
400
Load Current (mA)
V
OUT
(%)
−0.0
−0.2
−0.4
−0.6
Normalized V
OUT
vs. Temperature
I
OUT
= 0 mA
Output Voltage (%)
I
OUT
= 100 mA
I
OUT
= 200 mA
−0.8
−1.0
−1.2
−40
I
OUT
= 300 mA
I
OUT
= 350 mA
−20
0
20
40
60
80
100
120
140
Junction Temperature (_C)
Document Number: 71671
S-41221—Rev. D, 28-Jun-04
www.vishay.com
5
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