lt3009 Linear Technology Corporation, lt3009 Datasheet

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lt3009

Manufacturer Part Number
lt3009
Description
3?a Iq, 20ma Low Dropout Linear Regulators
Manufacturer
Linear Technology Corporation
Datasheet

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FEATURES
APPLICATIONS
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TYPICAL APPLICATION
Ultralow Quiescent Current: 3μA
Input Voltage Range: 1.6V to 20V
Output Current: 20mA
Dropout Voltage: 280mV
Adjustable Output (V
Fixed Output Voltages: 1.8V, 3.3V, 5V
Output Tolerance: ±2% Over Load, Line and
Temperature
Stable with Low ESR, Ceramic Output Capacitors
(1μF minimum)
Shutdown Current: <1μA
Current Limit Protection
Reverse-Battery Protection
Thermal Limit Protection
8-Lead SC70 and 2mm × 2mm DFN Packages
Low Current Battery-Powered Systems
Keep-Alive Power Supplies
Remote Monitoring
3.75V TO
Utility Meters
Hotel Door Locks
20V
V
IN
3.3V, 20mA Supply with Shutdown
1μF
ADJ
IN
SHDN
= V
LT3009-3.3
GND
OUT(MIN)
OUT
= 600mV)
1μF
3009 TA01a
V
3.3V
20mA
OUT
Low Dropout Linear Regulators
DESCRIPTION
The LT
(LDO) linear regulators. The devices supply 20mA out-
put current with a dropout voltage of 280mV. No-load
quiescent current is 3μA. Ground pin current remains
at less than 5% of output current as load increases. In
shutdown, quiescent current is less than 1μA.
The LT3009 regulators optimize stability and transient
response with low ESR ceramic capacitors, requiring a
minimum of only 1μF . The regulators do not require the
addition of ESR as is common with other regulators.
Internal protection circuitry includes current limiting,
thermal limiting, reverse-battery protection and reverse-
current protection.
The LT3009 Series are ideal for applications that require
moderate output drive capability coupled with ultralow
standby power consumption. The device is available in fi xed
output voltages of 1.8V, 3.3V and 5V, and as an adjustable
device with an output voltage range down to the 600mV
reference. The LT3009 is available in the 6-lead DFN and
8-lead SC70 packages.
All other trademarks are the property of their respective owners.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
®
3009 Series are micropower, low dropout voltage
500
450
400
350
300
250
200
150
100
50
0
–50 –25
Dropout Voltage/Quiescent Current
I
LOAD
I
Q
= 20mA
0
TEMPERATURE (°C)
25
50
3µA I
LT3009 Series
75
100 125 150
DROPOUT
VOLTAGE
Q
, 20mA
3009 TA01b
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
3009fa
1

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lt3009 Summary of contents

Page 1

... The device is available in fi xed output voltages of 1.8V, 3.3V and 5V, and as an adjustable device with an output voltage range down to the 600mV reference. The LT3009 is available in the 6-lead DFN and 8-lead SC70 packages. , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. ...

Page 2

... LT3009EDC-1.8#TR LT3009EDC-3.3 LT3009EDC-3.3#TR LT3009EDC-5 LT3009EDC-5#TR LT3009ESC8 LT3009ESC8#TR LT3009ESC8-1.8 LT3009ESC8-1.8#TR 2 Operating Junction Temperature Range (Notes 2, 3) LT3009E .............................................–40°C to 125°C Storage Temperature Range ...................–65°C to 150°C Lead Temperature: Soldering, 10 sec SC8 Package Only ............................................. 300°C 6 GND 5 SHDN 4 IN PART MARKING PACKAGE DESCRIPTION 6-Lead (2mm × ...

Page 3

... V < 20V, 1μA < I < 20mA IN LOAD V = 1.6V 100μA IN LOAD 1.6V < V < 20V, 1μA < I < 20mA IN LOAD LT3009-1.8: ΔV = 2.3V to 20V 1mA IN LOAD LT3009-3.3: ΔV = 3.8V to 20V 1mA IN LOAD ΔV LT3009-5: = 5.5V to 20V 1mA IN LOAD ΔV LT3009: = 1.6V to 20V 1mA IN LOAD LT3009-1. 2.3V 1μA to 20mA ...

Page 4

... Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: The LT3009 is tested and specifi ed under pulse load conditions ≅ T such that T . The LT3009 is guaranteed to meet performance ...

Page 5

... TEMPERATURE (°C) ADJ Pin Bias Current –2 –4 –6 –8 –10 –50 – 100 125 150 TEMPERATURE (°C) LT3009 Series T = 25°C, unless otherwise noted. A Minimum Input Voltage 1 20mA LOAD 1.4 1.2 1 0.8 0.6 0.4 0.2 0 –50 – TEMPERATURE (° ...

Page 6

... LT3009 Series TYPICAL PERFORMANCE CHARACTERISTICS Quiescent Current 1μA LOAD 18 16 LT3009 LT3009-3 LT3009-1 INPUT VOLTAGE (V) 3009 G10 GND Pin Current LT3009-5 450 R = 250Ω 20mA L L 400 350 300 250 200 R = 500Ω, I ...

Page 7

... FREQUENCY (Hz) 3009 G23 Transient Response I OUT OUT C OUT V OUT 50mV/DIV I OUT 20mA/DIV 3009 G25 LT3009 Series Input Ripple Rejection (NOMINAL 0.5V IN OUT P-P 10 RIPPLE 120Hz I = 20mA LOAD 0 –50 – 100 125 150 TEMPERATURE (° ...

Page 8

... OUT pin. In the case of a reversed input, which occurs with a battery plugged in backwards, the LT3009 acts large resistor is in series with its input. Limited reverse current fl ows into the LT3009 and no reverse voltage appears at the load. ...

Page 9

... In battery backup applications, where a backup battery holds up the output when the input is pulled to ground, the LT3009 acts blocking diode is in series with its output and prevents reverse current fl ow. In applications where the regulator load returns to a negative supply, the output can be pulled below ground by as much as 22V without affecting startup or normal operation ...

Page 10

... Table 1 to prevent contamination from causing unwanted shifts in the output voltage. Output Capacitance and Transient Response The LT3009 is stable with a wide range of output capaci- tors. The ESR of the output capacitor affects stability, most notably with small capacitors. Use a minimum output capacitor of 1μ ...

Page 11

... Carefully consider all sources of thermal resistance from junction to ambi- ent including other heat sources mounted in proximity to the LT3009. For surface mount devices, heat sinking is accomplished by using the heat spreading capabilities of the PC board and its copper traces. Copper board stiffen- ...

Page 12

... LT3009 Series APPLICATIONS INFORMATION The following tables list thermal resistance for several dif- ferent board sizes and copper areas. All measurements were taken in still air on 3/32" FR-4 board with one ounce copper. Table 2: Measured Thermal Resistance for DC Package COPPER AREA BOARD TOPSIDE* ...

Page 13

... Current fl ow back into the output follows the curve shown in Figure 5. If the LT3009 IN pin is forced below the OUT pin or the OUT pin is pulled above the IN pin, input current typically drops to less than 1μA. This occurs if the LT3009 input is ...

Page 14

... LT3009 Series TYPICAL APPLICATIONS V IN 12V 1μF V LINE 12V TO 15V D CHARGE R LIMIT SUPERCAP 14 Keep-Alive Power Supply NO PROTECTION DIODES NEEDED! 3.3V IN OUT 2.8M 1μF LT3009 1% SHDN ADJ VOLATILE MEMORY, ETC. GND 619k 1% Last-Gasp Circuit LINE POWER 5V IN OUT 4.32M 1μF 1μF LT3009 1% SHDN ADJ ...

Page 15

... BSC 0.80 – 1.00 0.10 – 0.18 (NOTE 3) 1.00 MAX 5. MOLD FLASH SHALL NOT EXCEED 0.254mm 6. DETAILS OF THE PIN 1 IDENTIFIER ARE OPTIONAL, BUT MUST BE LOCATED WITHIN THE INDEX AREA 7. EIAJ PACKAGE REFERENCE IS EIAJ SC-70 AND JEDEC MO-203 VARIATION BA LT3009 Series R = 0.115 0.38 ± 0.05 TYP 0.56 ± 0. SIDES) (4 SIDES) ...

Page 16

... LT3009 Series RELATED PARTS PART NUMBER DESCRIPTION LT1761 100mA, Low Noise Micropower LDO LT1762 150mA, Low Noise Micropower LDO LT1763 500mA, Low Noise Micropower LDO LT1764/LT1764A 3A, Low Noise, Fast Transient Response LDOs LTC1844 150mA, Low Noise Micropower VLDO LT1962 300mA, Low Noise Micropower LDO LT1963/LT1963A 1 ...

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