Low Dropout
Voltage Regulators
CLM2931
FEATURES
••5V, 3. 3V, 3.5V, 4.0 V, and 4.5V Versio ns Availa bl e
••Out pu t Cur re nt i n Exc ess of 100 mA
••Inpu t- Out pu t Dif feren tial is Less Than 0. 6V
••Mi rror -Im ag e In s erti on Pr ot ect io n
••Int er nal Ther m al Ov erl o a d Protec ti on
••Av ailabl e as A d justabl e w ith T T L Co mpa tible Switc h
••Similar to Industry Standard LM2931
••Rev ers e Bat tery Pr otect i on
••Short Circui t Protec ti on
••60 V Load Dum p Prot ect i on
••-50V Re v ers e T ra nsi ent Pro tect io n
APPLICATIONS
••Port abl e Inst ru me nt at io n
••Radio Control Syst ems
••Cordless Telephones
PRODUCT DESCRI PTI ON
The CLM2931 is a positive low power voltage regulator. This
device is an excellent choice for use in battery-powered
applications such as cordless telephones, radio control
systems, and po rtable computers. The CLM2931 features very
low q uiesce nt curre nt (0.4mA) and ver y low drop out put voltage
(typ. 50mV at light load and 300mV at 100mA). other features
include the logic-compatible on/off input which enables the
regulator to be switched on and off.
The regulator output voltage may be internally pin-strapped
for a 5V, 3V, 3.3V, 3.5V, 4.0V, 4.5V or programmed from 3V to
24V with an external pair of resistors. Using Calogic’s design,
process and testing technique make the CLM2931 superior
over similar pro ducts.
ORDERING INFORMAT ION
PART P ACKAG E TEMPERATURE RANGE
CLM2931AS-X Plasti c SOIC (8-Pin) Industrial
X = Output Voltage, 5V = standard product, for all other ranges
contact factory.
CORPORATION
PIN CONNECTI O NS
ADJ.
1
2
3
8
7
6
4
5 ON/OFF
CLM2931
1M-07
8-PIN SRFACE MOUNT, ADJ. OUTPUT
GND
GND
INPUT
GND
GND
OUTPUT
TOP VIEW
NC
1
2
3
8
7
6
4
5
NC
CLM2931
8-PIN SURFACE MOUNT, FIX OUTPUT
GND
GND
INPUT
GND
GND
OUTPUT
TOP VIEW
CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510 -656- 2900, FA X: 510-65 1-3025
ABSOLUTE M AXIM UM R A T INGS
Power Dissipat ion . . . . . . . . . . . . . . . . . . . . . Internally Lim ited
Lead Temp. ( Solder ing, 5 Seconds) . . . . . . . . . . . . . . . 260oC
Stor age Temper at ure R a nge. . . . . . . . . . . . . . . -65 t o +150oC
Oper ating Ju nct ion Te mper at ure Ran ge . . . . . . . -40 to +85oC
Input Supply V o ltag e . . . . . . . . . . . . . . . . . . . . . . 0. 30 to +26 V
ESD Ratin g . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2K V
CLM2931
CORPORATION
CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510 -656- 2900, FA X: 510-65 1-3025
ELECTRICA L CHARACTERI STICS: VS = 14V, TA = 25oC, IO = 10m A, C2 = 10 0µF, unless otherwise spe cified . (Note 1)
PARAMETER CLM2931A CLM2931 UNITS CONDITIONS
(Note 2)
MIN TYP MAX MIN TYP MAX
3V VERSION CLM2 931A-3 CLM2931 -3
Output Voltage 2.94
2.88 3.0
3.0 3.06
3.12 2.91
2.85 3.0
3.0 3.09
3.15 V
V 6V<VIN<26V, IO = 100 mA Over Temp .
3.3V VERSION CLM 2931A-3.3 CLM2931-3.3
Output Voltage 3.23
3.20 3.30
3.30 3.36
3.39 3.20
3.16 3.30
3.30 3.39
3.43 V
V 6V<VIN<26V, IO = 100 mA Over Temp .
5V VERSION CLM2 931A-5 CLM2931 -5
Output Voltage 4.81
4.75 5.0 5.19
5.25 4.75
4.50 5.0 5.25
5.50 V
V 6V<VIN<26V, IO = 100 mA Over Temp .
ALL VOLTAGE OPTIONS
Long Term Stability 20 20 mV/1000
Line Regulation 2.0
4.0 10
30 4.0 30 mV 9V<VIN<16V
6V<VIN<26V
Load Regulation 14 50 14 50 mV 5mA<IO<100mA
Dropout Vol tage 0.05
0.07
0.3
0.2
0.1
0.6
0.05
0.07
0.3
0.2
0.1
0.6
V
V
V
IO = 10mA
IO = 50mA
IO = 100mA
Quiescent Current 0.4
15 1.0 0.4
15 1.0 mA
mA IO<10mA,6V<VIN<2 6V, -40 oC<TJ<125oC
IO = 100mA, VIN = 14V, TJ = 25oC
Maximum Operational
Input Current 26 33 26 33 V
Maximum Line Transient 60 70 70 50 V RL = 500Ω, VO<5.5V, 100ms
Reverse Pola rity Input
Voltage, DC -15 -30 -15 30 V VO>-0.3V, RL = 500Ω
Reverse Pola rity Input
Voltage, Transient -50 -80 -50 -80 V 1% Duty Cycle, τ<1 00m s , R L = 500Ω
Output Noise V oltage 500 500 µVrms 10Hz-100kHz, COUT = 100µF
Ripple Rejection 80 80 dB fO = 120Hz
CLM2931
CORPORATION
CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510 -656- 2900, FA X: 510-65 1-3025
ADJUSTABLE VERSION ONLY: VIN = 14V, VO = 3V, IO = 10mA, R1 = 27k, C2 = 100µF, TJ = 25o
PARAMETER CLM2931C UNITS CONDITIONS
MIN TYP MAX
Output Voltage Range 3.0 24 V
Line Regulation 0.2 1.5 mV VOUT + 0.6V<VIN<26V
Load Regulation 0.3 1.0 mV 5mA<IO<100mA
Output Impedance 40 mΩ/V 100mADC and 10mArms, 100Hz-10kHz
Quiescent Current 0.4
15
0.8
1.0
1.0
mA
mA
mA
IO = 10mA
IO = 100mA
During Shutdown RL = 500Ω
Output Noise V oltage 100 µVrms 10Hz-100kHz
Long Term Stabi lity 0.4 %/1000h
Ripple Rejection 0.02 %/V fO = 120Hz
Dropout Vol tage 0.05
0.3 0.2
0.6 V
VIO < 10mA
IO = 100mA
Maximum Operational Input V oltage 26 33 V
Maximum Line Transient 60 70 V IO = 1 0mA, Reference Vo l tage <1.5V
Reverse Pola rity Input Volt age, DC -15 -30 V VO>-0.3V, RL = 500Ω
Reverse Pola rity Input Voltage , Tra nsie nt -50 -80 V 1 % Duty Cycle, T<100ms, RL = 500Ω
On/Off Threshold Current 20 50 µA
Thresho ld Votag e
On
Off 3.25 2.0
2.2 1.2 V VO = 3V
Note 1: See TYPICAL APPLICATIONS notes to ensure const ant junction temperature, low duty cy cle pulse testing used.
Note 2: All limits are at 25oC or ove r the ful l ope rati ng temp era tu re jun cti on range of -40oC to +125oC.
Note 3: The maximu m power dissipatio n i s a functio n of ma ximu m junctio n t empe rature , total therma l re sista nce, and a m bient te mpera ture.
Note 4: Human body model, 100µF discharged through 1.5KΩ.
APPLICATION HINTS
The CLM2931 requires an output capa cito r for d evice st ability.
The value required varies greatly depending upon the
application circuit and other factors. The high frequency
characteristics of electolytic capacitors depend greatly on the
type and also on the manufacturer. Sometimes only bench
testing is the only means to determine the proper capacitor
type and value. The high quality 100µF aluminum electrolyt ic
covers all general application circuits, this stability can be
obtaine d with a tant alum elec trolyt ic value of 47µF.
Another critical point of electrolytic characteristics is its
performance over temperature. The CLM2931 is designed to
operate starting at -40oC which may not be true in the case of
electrolytic. Higher temperatures are generally no problem.
The electrolytic type in aluminum will freeze at around -30oC.
This could cause an oscillation at output of regulator. At a
lower temperature requirement by many applications the
capacitor should maint ain its performance. So as a result, for an
application which regulator junction temperatur e does no t e xceed
25oC, the output capacitor can be reduced by the fact or of two
over the value needed for the entire temperature range.
Other points with linear regulators is that the twitch higher
output current stability decreases. In most applications the
CLM2931 is operating at a few milliamps. In these
applications the output capacitance can be further reduced.
For example, when the regulator is running at 10mA output
current the output capacitance value is half compared to the
same reg ulat or tha t is running at 100mA.
With the CLM2931CT ad justable regulat or , the m inimum value
of output capaci tance is a function of the output voltage. The
value decreases with higher output voltages, since the
inter nal lo op gain is reduc ed.
The worst case occurs at the lower temperature and
maximum operating currents, the entire circuit and the
electrolytic, should be cooled down to the minimum
temperature. The minimum of 0.6 volts required at the input
of regulator above the output to keep the power dissipation
and die heating to its minimum. After the value for the
capacitor has been determined for actual use, the value
should be dou bled.
CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510 -656- 2900, FA X: 510-65 1-3025
CLM2931
CORPORATION
TYPICAL APPL ICA TION S
CLM2931 FIXED OUTPUT
UNREGULATED
INPUT
V
REGULATED
OUTPUT
C1
0.1 GND I
Q
+C2
100
µ
F
OUT
CLM2931
1M-06
V
IN
V
CC
IN OUT
ON/OFF
V
OUT
R1
20k
C2
100
µ
F
R2
ADJ
GND
ON
OFF
R3
51k
C1
0.1
µ
F
CLM2931
ADJUSTABLE
V = Reference Voltage x
OUT
R1 + R2
R1
1M-09
CLM2 931 FI XED OUTPUT
CLM2931 ADJUST ABL E OUTPUT
SCHEMATIC DIAGRAM
V
IN
Q1
V
OUT
R1
5V: 20k
ADJ:
∞
ADJUST
R2
5V: 100k
ADJ:
∞
GND
R6
6
Q2 Q10 Q3
R16
6k
R19
200
1
1
Q12
Q13
15
R7
30k
Z1
Z2
Z3
Z4
ON/OFF
R11
50k
R13
40k
D1
D15
140k
Q15
R8
3k
R14
184k Z6
R16
14.7k
R12
140k
R10
30k
Q11
Q9
Q16
Q8
Q7
Q6
Q4
R5
2.1k
R4
3.6k
R3
32k
Q5
4x
1M-08
CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510 -656- 2900, FA X: 510-65 1-3025
CLM2931
CORPORATION
TYPICAL PERFO RM ANCE CHARACTERI STIC S
OUPUT IMPEDANCE (
Ω
)
OUTPUT IMPEDANCE
1M-22
FREQUENCY (Hz)
10
0.01
1
0.1
1
10 100 1k 10k 100k 1M
I
O
= 10mA
LM2931 - 3.0
70
60
50
40
30
20
10
0
1M-23
OPERATION DURING
LOAD DUMP
OUTPUT
VOLTAGE (V)
TIME (ms)
C
O
= 100
µ
F
INPUT
VOLTAGE (V)
6
4
2
0
-2
-100 0 100 200 300 400 500
R
L
= 500
Ω
τ
= 150ms
OUTPUT VOLTAGE (V)
REFERENCE VOLTAGE ( V)
1.30
1.28
1.26
1.24
1.22
1.20
1.18
1.16
1.14
1.12
1.10
1M-24
REFERENCE VOLTAGE
0
LM2031C ADJUSTABLE
3 6 91215 182124 JUNCTION TEMPERATURE (˚C)
0.6
0.5
0.4
0.3
0.2
0.1
0
1M-25
DROPOUT VOLTAGE
INPUT-OUTPUT DIFFERENTIAL (V)
0 40 80 120
I
O
= 50mA
I
O
= 10mA
I
O
= 100mA
OUTPUT CURRENT (mA)
1M-26
DROPOUT VOLTAGE
INPUT-OUTPUT DIFFERENTIAL (V)
050
0.6
0.5
0.4
0.3
0.2
0.1
0100
INPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
6.0
5.0
4.0
3.0
2.0
1.0
1M-27
LOW VOLTAGE BEHAVIOR
2.0 3.0 4.0 5.0 6.0
I
O
= 100mA
LM2931-5.0
CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510 -656- 2900, FA X: 510-65 1-3025
CLM2931
CORPORATION
TYPICAL PERFO RM ANCE CHARACTERI STICS (continued)
INPUT VOLTAGE (V)
600
500
400
300
200
100
0
1M-28
PEAK OUTPUT CURRENT
OUTPUT CURRENT (mA)
0102030
T
J
= 25˚C
T
J
= 85˚C
T
J
= -40˚C
OUTPUT CURRENT (mA)
0
1M-29
QUIESCENT CURRENT
30
25
20
15
10
5
QUIESCENT CURRENT (mA)
030 6090
V
IN
= 14V
25
0
1M-30
QUIESCENT CURRENT
20
15
10
3
2
1
QUIESCENT CURRENT (mA)
-40 0 40 80 120
JUNCTION TEMPERATURE (˚C)
I
O
= 50mA
I
O
= 0mA
AMBIENT TEMPERATURE (˚C)
POWER DISSIPATION (W)
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
1M-31
MAXIMUM POWER DISSIPATION
(SO-8)
02040608010 30 50 70 90
AMBIENT TEMPERATURE (˚C)
POWER DISSIPATION (W)
22
20
18
16
14
12
10
8
6
4
2
0
1M-32
MAXIMUM POWER DISSIPATION
(TO-220)
020 40608010 30 50 70 90 100
INFINITE HEATSINK
10˚C/W HEAT SINK
NO HEAT SINK
AMBIENT TEMPERATURE (˚C)
POWER DISSIPATION (W)
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
1M-33
MAXIMUM POWER DISSIPATION
(TO-92)
02040608010 30 50 70 90
0.125" LEAD LENGTH
FROM PC BOARD
0.4" LEAD LENGTH
FROM PC BOARD
