LTC1844 Series - 150mA, Micropower, Low Noise, VLDO Linear ...
U U
FEATURES
Very Low Dropout: 90mV at 150mA 30mV at 50mA (LTC1844-3.3)
Wide Input Voltage Range: 1.6V to 6.5V Low 35?A Supply Current, Even in Dropout Low Noise: 60?VRMS (10Hz to 100kHz) ?1.75% Voltage Accuracy Over Temperature,
Voltage and Current Ranges Fast Transient Response 10nA Supply Current in Shutdown Fixed Output Voltages: 1.5V, 1.8V, 2.5V, 2.8V, 3.3V Adjustable Output Voltage: 1.25V to 6V Output Current Limit Reverse-Battery and Reverse-Current Protection No Protection Diodes Needed Stable with 1?F Output Capacitor Stable with Ceramic Capacitors Short-Circuit and Thermal Overload Protection Low Profile (1mm) SOT-23 Package
U APPLICATIO S
Portable Instruments and Battery-Powered Systems Bluetooth/802.11 Cards Cellular Phones PDAs and Notebook Computers
LTC1844 Series
150mA, Micropower, Low Noise, VLDO Linear Regulator
DESCRIPTIO
The LTC?1844 Series are low noise VLDOTM (very low dropout) linear regulators designed for low power/portable applications. These regulators can operate from input voltages as low as 1.6V. Typical output noise is only 30?VRMS and typical dropout for the LTC1844-3.3 is just 90mV at the maximum load current of 150mA, reducing to 30mV at 50mA.
The internal P-channel MOSFET pass transistor requires no base current, allowing the device to draw only 35?A during normal operation, independent of the dropout voltage and load current. The quiescent current falls to a negligible 10nA during shutdown.
Other features include high output voltage accuracy, excellent transient response, stability with ultralow ESR ceramic capacitors as small as 1?F, reverse-battery and reverse-current protection, short-circuit and thermal overload protection and output current limiting.
The LTC1844 regulators are available in a low profile (1mm) SOT-23 (ThinSOTTM) package.
, LTC and LT are registered trademarks of Linear Technology Corporation. VLDO and ThinSOT are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.
TYPICAL APPLICATIO
Fixed Voltage Low Noise, VLDO Linear Regulator
VIN 3.3V TO 6.5V
OFF ON
IN
OUT
1?F LTC1844-3.3
SHDN BYP GND
VOUT 3.3V 1?F
0.1?F
1844 TA01
DROPOUT VOLTAGE (mV)
LTC1844-3.3 Dropout Voltage vs Load Current
120
100
80
60
40
20
0 0 25 50 75 100 125 150 IOUT (mA)
1844 TA02
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LTC1844 Series
U WW W
ABSOLUTE AXI U RATI GS (Note 1)
Supply Voltage (IN) ....................................... ? 7V to 7V Input Voltage
SHDN, BYP, ADJ .................................... ? 0.3V to 7V Output Voltage
OUT ........................................................ ? 0.3V to 7V OUT to IN .................................................. ? 7V to 7V
Output Short-Circuit Duration ......................... Indefinite
Operating Junction Temperature Range (Notes 2, 10) .....................................?40?C to 125?C
Storage Temperature Range ................. ? 65?C to 150?C Lead Temperature (Soldering, 10 sec).................. 300?C
UW U PACKAGE/ORDER I FOR ATIO
TOP VIEW
TOP VIEW
IN 1 GND 2 SHDN 3
5 OUT 4 BYP
IN 1 GND 2 SHDN 3
5 OUT 4 ADJ
S5 PACKAGE 5-LEAD PLASTIC TSOT-23
TJMAX = 125?C, JA = 250?C/ W, JC = 90?C/ W SEE THE APPLICATIONS INFORMATION SECTION
S5 PACKAGE 5-LEAD PLASTIC TSOT-23
TJMAX = 125?C, JA = 250?C/ W, JC = 90?C/ W SEE THE APPLICATIONS INFORMATION SECTION
ORDER PART NUMBER
S5 PART MARKING
ORDER PART NUMBER
LTC1844ES5-1.5 LTC1844ES5-1.8 LTC1844ES5-2.5 LTC1844ES5-2.8 LTC1844ES5-3.3
LTF1 LTF2 LTF3 LTQK LTF4
LTC1844ES5-SD
Order Options Tape and Reel: Add #TR Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking:
S5 PART MARKING
LTE8
Consult LTC Marketing for parts specified with wider operating temperature ranges.
TOP VIEW
IN 1 GND 2 BYP 3
5 OUT 4 ADJ
S5 PACKAGE 5-LEAD PLASTIC TSOT-23
TJMAX = 125?C, JA = 250?C/ W, JC = 90?C/ W SEE THE APPLICATIONS INFORMATION SECTION
ORDER PART NUMBER
LTC1844ES5-BYP
S5 PART MARKING
LTE9
ELECTRICAL CHARACTERISTICS The denotes specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25?C. VIN = VOUT + 0.5V, unless otherwise noted. (Note 2)
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX
VIN
Input Voltage
IIN
Quiescent Current
SHDN = VIN
1.6
6.5
35
55
80
IINSHDN VIN Shutdown Supply Current
SHDN = 0V
0.01
1
VOUT% Regulated Output Voltage
LTC1844-3.3 VIN = 3.8V to 6.5V, IOUT = 0mA to 150mA
?1.50
1.50
(Notes 3, 4, 5)
LTC1844-3.3 VIN = 3.8V to 6.5V, IOUT = 0mA to 150mA ?1.75
1.75
LTC1844-2.8 VIN = 3.3V to 6.5V, IOUT = 0mA to 150mA
?1.50
1.50
LTC1844-2.8 VIN = 3.3V to 6.5V, IOUT = 0mA to 150mA ?1.75
1.75
LTC1844-2.5 VIN = 3.0V to 6.5V, IOUT = 0mA to 150mA
?1.50
1.50
LTC1844-2.5 VIN = 3.0V to 6.5V, IOUT = 0mA to 150mA ?1.75
1.75
LTC1844-1.8 VIN = 2.3V to 6.5V, IOUT = 0mA to 150mA
?1.50
1.50
LTC1844-1.8 VIN = 2.3V to 6.5V, IOUT = 0mA to 150mA ?1.75
1.75
2
UNITS
V
?A ?A
?A
%VOUT %VOUT
%VOUT %VOUT
%VOUT %VOUT
%VOUT %VOUT
1844fa
LTC1844 Series
ELECTRICAL CHARACTERISTICS The denotes specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25?C. VIN = VOUT + 0.5V, unless otherwise noted. (Note 2)
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX
VADJ
ADJ Pin Voltage (Notes 3, 5)
VLNR Line Regulation (Notes 3, 5)
VLDR Load Regulation (Notes 3, 5) VDO Dropout Voltage (Notes 6, 7)
LTC1844-1.5 VIN = 2.0V to 6.5V, IOUT = 0mA to 150mA
?1.50
1.50
LTC1844-1.5 VIN = 2.2V to 6.5V, IOUT = 0mA to 150mA ?2.00
2.00
LTC1844-1.5 VIN = 2.0V to 6.5V, IOUT = 0mA to 100mA ?2.50
2.00
LTC1844-BYP VIN = 1.75V to 6.5V, IOUT = 0mA to 150mA
?1.50
1.50
LTC1844-BYP VIN = 2.2V to 6.5V, IOUT = 0mA to 150mA ?1.75
1.75
LTC1844-BYP VIN = 1.75V to 6.5V, IOUT = 0mA to 100mA ?3.50
1.75
LTC1844-SD VIN = 1.75V to 6.5V, IOUT = 0mA to 150mA
?1.50
1.50
LTC1844-SD VIN = 2.2V to 6.5V, IOUT = 0mA to 150mA ?1.75
1.75
LTC1844-SD VIN = 1.75V to 6.5V, IOUT = 0mA to 100mA ?3.50
1.75
LTC1844-BYP VIN = 1.75V to 6.5V, IOUT = 0mA to 150mA
1.233 1.25 1.271
LTC1844-BYP VIN = 2.2V to 6.5V, IOUT = 0mA to 150mA 1.230
1.274
LTC1844-BYP VIN = 1.75V to 6.5V, IOUT = 0mA to 100mA 1.208
1.274
LTC1844-SD VIN = 1.75V to 6.5V, IOUT = 0mA to 150mA
1.233 1.25 1.271
LTC1844-SD VIN = 2.2V to 6.5V, IOUT = 0mA to 150mA 1.230
1.274
LTC1844-SD VIN = 1.75V to 6.5V, IOUT = 0mA to 100mA 1.208
1.274
LTC1844-3.3 VIN = 3.4V to 6.5V, IL = 1mA
4
20
LTC1844-2.8 VIN = 2.9V to 6.5V, IL = 1mA
4
20
LTC1844-2.5 VIN = 2.6V to 6.5V, IL = 1mA
4
20
LTC1844-1.8
VIN = 2.2V to 6.5V, IL = 1mA VIN = 1.9V to 6.5V, IL = 1mA VIN = 1.9V to 6.5V, IL = 1mA
4
20
4
20
4
30
LTC1844-1.5
VIN = 2.2V to 6.5V, IL = 1mA VIN = 1.6V to 6.5V, IL = 1mA VIN = 1.6V to 6.5V, IL = 1mA
4
20
4
20
4
80
LTC1844-BYP VIN = 2.2V to 6.5V, IL = 1mA VIN = 1.6V to 6.5V, IL = 1mA VIN = 1.6V to 6.5V, IL = 1mA
4
20
4
20
4
80
LTC1844-SD
VIN = 2.2V to 6.5V, IL = 1mA VIN = 1.6V to 6.5V, IL = 1mA VIN = 1.6V to 6.5V, IL = 1mA
4
20
4
20
4
80
LTC1844-3.3 VIN = 3.8V, IOUT = 0mA to 150mA
9
20
LTC1844-2.8 VIN = 3.3V, IOUT = 0mA to 150mA
9
20
LTC1844-2.5 VIN = 3.0V, IOUT = 0mA to 150mA
9
20
LTC1844-1.8 VIN = 2.3V, IOUT = 0mA to 150mA
9
20
LTC1844-1.5 VIN = 2.2V, IOUT = 0mA to 150mA
VIN = 2.0V, IOUT = 0mA to 100mA
9
20
9
40
LTC1844-BYP VIN = 2.2V, IOUT = 0mA to 150mA
VIN = 1.75V, IOUT = 0mA to 100mA
9
20
9
50
LTC1844-SD VIN = 2.2V, IOUT = 0mA to 150mA
VIN = 1.75V, IOUT = 0mA to 100mA
9
20
9
50
LTC1844-3.3 IOUT = 50mA IOUT = 150mA
30
55
90
150
LTC1844-2.8 IOUT = 50mA IOUT = 150mA
35
60
105
165
LTC1844-2.5 IOUT = 50mA IOUT = 150mA
45
75
135
200
LTC1844-1.8 IOUT = 50mA IOUT = 150mA
85
120
230
300
UNITS
%VOUT %VOUT %VOUT %VOUT %VOUT %VOUT %VOUT %VOUT %VOUT
V V V
V V V
mV
mV
mV
mV mV mV
mV mV mV
mV mV mV
mV mV mV
mV
mV
mV
mV
mV mV
mV mV
mV mV
mV mV
mV mV
mV mV
mV mV
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LTC1844 Series
ELECTRICAL CHARACTERISTICS The denotes specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25?C. VIN = VOUT + 0.5V, unless otherwise noted. (Note 2)
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX
LTC1844-1.5 LTC1844-BYP LTC1844-SD
IOUT = 50mA IOUT = 150mA
IOUT = 50mA IOUT = 150mA
IOUT = 50mA IOUT = 150mA
115 160
350 450
45
75
135 200
45
75
135 200
ILIM
Output Current Limit
en
Output Voltage Noise
160
350
f = 10Hz to 100kHz, CBP = 0.1?F, COUT = 10?F, IL = 150mA
60
f = 10Hz to 100kHz, CBP = 0.1?F, COUT = 1?F, IL = 150mA
65
VSHDN tDELAY
SHDN Input Threshold Shutdown Exit Delay
CBP = 0.01?F, COUT = 1?F, No load CBP = 0.01?F, COUT = 1?F, No load
0.35 0.65
0.9
70
100
200
TSHDN Thermal Shutdown Limit
155
TSHDN Thermal Shutdown Hysteresis
10
IADJ
ADJ Pin Bias Current
(Notes 3, 8)
30
100
IIRL
Input Reverse Leakage Current LTC1844-3.3, LTC1844-2.8, LTC1844-2.5, LTC1844-1.8,
LTC1844-1.5, VIN = ?5V, VOUT = 0V
200 500
LTC1844-BYP, LTC1844-SD, VIN = ?5V, VOUT = 0V
1000 1500
IORL
Output Reverse Leakage Current VIN = 0V, VOUT = VOUT(NOMINAL)
(Note 9)
VIN = 0V, VOUT = VOUT(NOMINAL)
0.01 0.1
1.2
VOSH
Start-Up Overshoot
RL = 1k, SHDN Rise Time 1?s
2
VRP
Output Ripple Rejection
(VIN ? VOUT) = 1V (Avg), VRIPPLE = 0.5VP-P,
50
fRIPPLE = 120Hz, ILOAD = 100mA
UNITS mV mV mV mV mV mV mA
?VRMS ?VRMS
V ?s ?s ?C ?C nA ?A
?A ?A ?A %VOUT dB
Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired.
Note 2: The LTC1844 is tested and specified under pulse load conditions such that TJ TA. The LTC1844E is guaranteed to meet performance specifications from 0?C to 70?C. Specifications over the ? 40?C to 125?C operating junction temperature range are assured by design, characterization and correlation with statistical process controls.
Note 3: The LTC1844 adjustable versions are tested and specified for these conditions with the ADJ pin connected to the OUT pin for a VOUT(NOMINAL) of 1.25V. Note 4: Operating conditions are limited by maximum junction temperature. The regulated output voltage specification will not apply for all possible combinations of input voltage and output current. When operating at maximum input voltage, the output current range must be limited. When operating at maximum output current, the input voltage range must be limited.
Note 5: The LTC1844's high precision degrades slightly at high temperatures (TJ > 70?C) with input voltages below 2.2V. The lower output voltage versions have been split into higher and lower accuracy input voltage ranges to reflect this.
Note 6: To ensure adequate input supply voltage, the LTC1844 adjustable versions are tested and specified for these conditions with an external resistor divider (two 100k resistors) for an output voltage of 2.50V. The external resistor divider will add a 5?A load on the output.
Note 7: Dropout voltage is (VIN ? VOUT) when VOUT falls to 100mV below its nominal value measured at VIN = VOUT + 0.5V. For example, the LTC1844-3.3 is tested by measuring the VOUT at VIN = 3.8V, then VIN is lowered until VOUT falls 100mV below the measured value. The difference (VIN ? VOUT) is then measured and defined as VDO. Note 8: ADJ pin bias current flows into the ADJ pin.
Note 9: Output reverse leakage current is tested with the IN pin grounded and the OUT pin forced to the rated output voltage.
Note 10: This IC includes overtemperature protection that is intended to protect the device during momentary overload conditions. Junction temperature will exceed 125?C when overtemperature protection is active. Continuous operation above the specified maximum operating junction temperature may impair device reliability.
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VOUT (V)
UW
TYPICAL PERFOR A CE CHARACTERISTICS
LTC1844 Series
VOUT vs Temperature
1.520 VOUT = 1.5V
1.515
1.510
1.505
1.500
1.495
1.490
1.485
1.480 ? 50 ? 25
0 25 50 75 TEMPERATURE (?C)
100 125
1844 G01
VOUT vs Temperature
2.820 VOUT = 2.8V
2.815
2.810
2.805
2.800
2.795
2.790
2.785
2.780 ? 50 ? 25
0 25 50 75 TEMPERATURE (?C)
100 125
1844 G04
Quiescent Current vs Temperature
70
60
50
40
30
20
10
0 ?50 ?25
0 25 50 75 TEMPERATURE (?C)
100 125
1844 G07
CURRENT LIMIT (mA)
VOUT (V)
VOUT (V)
VOUT vs Temperature
1.820 VOUT = 1.8V
1.815
1.810
1.805
1.800
1.795
1.790
1.785
1.780 ? 50 ? 25
0 25 50 75 TEMPERATURE (?C)
100 125
1844 G02
VOUT vs Temperature
3.320 VOUT = 3.3V
3.315
3.310
3.305
3.300
3.295
3.290
3.285
3.280 ? 50 ? 25
0 25 50 75 TEMPERATURE (?C)
100 125
1844 G05
Current Limit vs Temperature
500 VOUT = 2.8V
450
400
350
300
250
200 ?50 ?25
0 25 50 75 TEMPERATURE (?C)
100 125
1844 G08
SHDN THRESHOLD (mV)
VOUT (V)
VOUT (V)
VOUT vs Temperature
2.520 VOUT = 2.5V
2.515
2.510
2.505
2.500
2.495
2.490
2.485
2.480 ? 50 ? 25
0 25 50 75 TEMPERATURE (?C)
100 125
1844 G03
VOUT vs Temperature
1.270 VOUT = ADJ
1.265
1.260
1.255
1.250
1.245
1.240
1.235
1.230 ? 50 ? 25
0 25 50 75 TEMPERATURE (?C)
100 125
1844 G05
SHDN Threshold vs Temperature
800 ILOAD = 1mA
750
700
650
600
550
500
450
400 ? 50 ? 25
0 25 50 75 TEMPERATURE (?C)
100 125
1844 G09
IQ (?A)
VOUT (V)
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