Datasheet

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LT3010/LT3010-5

30105fe

FEATURES

APPLICATIONS

DESCRIPTION

50mA, 3V to 80V

Low Dropout

Micropower Linear Regulator

The LT

3010 is a high voltage, micropower low dropout

linear regulator. The device is capable of supplying 50mA

output current with a dropout voltage of 300mV. Designed

for use in battery-powered or high voltage systems, the low

quiescent current (30µA operating and 1µA in shutdown)

makes the LT3010 an ideal choice. Quiescent current is

also well controlled in dropout.

Other features of the LT3010 include the ability to operate

with very small output capacitors. The regulators are stable

with only 1µF on the output while most older devices re-

quire between 10µF and 100µF for stability. Small ceramic

capacitors can be used without the necessary addition of

ESR as is common with other regulators. Internal protec-

tion circuitry includes reverse-battery protection, current

limiting, thermal limiting and reverse current protection.

The device is available in a ﬁxed output voltage of 5V and

as an adjustable device with a 1.275V reference voltage.

The LT3010 regulator is available in the 8-lead MSOP pack-

age with an exposed pad for enhanced thermal handling

capability.

Wide Input Voltage Range: 3V to 80V

Low Quiescent Current: 30µA

Low Dropout Voltage: 300mV

Output Current: 50mA

Thermally Enhanced 8-Lead MSOP Package

No Protection Diodes Needed

Fixed Output Voltage: 5V (LT3010-5)

Adjustable Output from 1.275V to 60V (LT3010)

1µA Quiescent Current in Shutdown

Stable with 1µF Output Capacitor

Stable with Aluminum, Tantalum or Ceramic

Capacitors

Reverse-Battery Protection

No Reverse Current Flow from Output

Thermal Limiting

Low Current High Voltage Regulators

Regulator for Battery-Powered Systems

Telecom Applications

Automotive Applications

5V Supply with Shutdown

Dropout Voltage

TYPICAL APPLICATION

LT3010-5

SHDN

1µF

5.4V TO

80V

OUT

SENSE

GND

30105 TA01

OUT

50mA

SHDN

(PIN 5)

<0.3V

>2.0V

OUTPUT

OFF

1µF

OUTPUT CURRENT (mA)

250

300

350

30105 TA02

200

150

10 20 30 50

100

DROPOUT VOLTAGE (mV)

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and

ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property

of their respective owners.

Downloaded from Arrow.com.

Summary of content (18 pages)

PAGE 1
LT3010/LT3010-5 50mA, 3V to 80V Low Dropout Micropower Linear Regulator DESCRIPTION FEATURES n n n n n n n n n n n n n n Wide Input Voltage Range: 3V to 80V Low Quiescent Current: 30µA Low Dropout Voltage: 300mV Output Current: 50mA Thermally Enhanced 8-Lead MSOP Package No Protection Diodes Needed Fixed Output Voltage: 5V (LT3010-5) Adjustable Output from 1.
PAGE 2
LT3010/LT3010-5 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Note 1) IN Pin Voltage......................................................... ±80V OUT Pin Voltage...................................................... ±60V IN to OUT Differential Voltage................................. ±80V ADJ Pin Voltage........................................................ ±7V SHDN Pin Input Voltage.......................................... ±80V Output Short-Circuit Duration..........................
PAGE 3
LT3010/LT3010-5 ELECTRICAL CHARACTERISTICS (LT3010E, LT3010MP) The l denotes the specifications which apply over the –40°C to 125°C (LT3010E) or –55°C to 125°C (LT3010MP) operating temperature range, otherwise specifications are at TA = 25°C. PARAMETER CONDITIONS Line Regulation LT3010-5 ΔVIN = 5.
PAGE 4
LT3010/LT3010-5 ELECTRICAL CHARACTERISTICS (LT3010H) The l denotes the specifications which apply over the –40°C to 140°C operating temperature range, otherwise specifications are at TA = 25°C.
PAGE 5
LT3010/LT3010-5 TYPICAL PERFORMANCE CHARACTERISTICS Typical Dropout Voltage Guaranteed Dropout Voltage 600 500 = TEST POINTS 450 400 350 TJ = 125°C 300 250 200 TJ = 25°C 150 100 400 DROPOUT VOLTAGE (mV) 500 DROPOUT VOLTAGE (mV) DROPOUT VOLTAGE (mV) 450 Dropout Voltage 500 TJ ≤ 125°C 300 TJ ≤ 25°C 200 100 0 5 0 10 15 20 25 30 35 40 45 50 OUTPUT CURRENT (mA) 0 5 250 150 0 –50 –25 10 15 20 25 30 35 40 45 50 OUTPUT CURRENT (mA) LT3010 ADJ Pin Voltage 5.06 1.285 5.04 10 5 0 1.
PAGE 6
LT3010/LT3010-5 TYPICAL PERFORMANCE CHARACTERISTICS LT3010-5 GND Pin Current GND Pin Current vs ILOAD 2.0 2.0 1.6 1.6 VIN = VOUT(NOMINAL) + 1V 1.8 TJ = 25°C RL = 200Ω IL = 25mA* 1.0 0.8 RL = 500Ω IL = 10mA* 0.6 0.4 0 1 2 3 4 5 6 7 INPUT VOLTAGE (V) 8 1.0 0.8 0.6 9 0 10 SHDN PIN CURRENT (µA) SHDN PIN CURRENT (µA) 0.1 1.5 2 2.5 3 3.5 4 SHDN PIN VOLTAGE (V) 4.5 5 0.3 0.
PAGE 7
LT3010/LT3010-5 TYPICAL PERFORMANCE CHARACTERISTICS Reverse Output Current 50 40 30 20 0 90 76 80 74 72 70 68 66 62 LT3010 0 –50 –25 78 64 LT3010-5 10 100 RIPPLE REJECTION (dB) 60 VIN = 0V VOUT = VADJ = 1.275V (LT3010) VOUT = VSENSE = 5V (LT3010-5) 0 ILOAD = 50mA –5 LOAD REGULATION (mV) MINIMUM INPUT VOLTAGE (V) 3.5 2.5 2.0 1.5 1.0 0.
PAGE 8
LT3010/LT3010-5 PIN FUNCTIONS OUT (Pin 1): Output. The output supplies power to the load. A minimum output capacitor of 1µF is required to prevent oscillations. Larger output capacitors will be required for applications with large transient loads to limit peak voltage transients. See the Applications Information section for more information on output capacitance and reverse output characteristics. SENSE (Pin 2): Sense. For the LT3010-5, the SENSE pin is the input to the error amplifier.
PAGE 9
LT3010/LT3010-5 APPLICATIONS INFORMATION The LT3010 is a 50mA high voltage low dropout regulator with micropower quiescent current and shutdown. The device is capable of supplying 50mA at a dropout voltage of 300mV. The low operating quiescent current (30µA) drops to 1µA in shutdown. In addition to the low quiescent current, the LT3010 incorporates several protection features which make it ideal for use in battery-powered systems.
PAGE 10
LT3010/LT3010-5 APPLICATIONS INFORMATION 20 BOTH CAPACITORS ARE 16V, 1210 CASE SIZE, 10µF 0 CHANGE IN VALUE (%) X5R –20 –40 –60 Y5V 0 2 4 6 8 10 12 DC BIAS VOLTAGE (V) 14 16 30105 F03 Figure 3. Ceramic Capacitor DC Bias Characteristics 40 CHANGE IN VALUE (%) X5R –20 –40 Y5V –60 –80 BOTH CAPACITORS ARE 16V, 1210 CASE SIZE, 10µF –100 25 75 –50 –25 0 50 TEMPERATURE (°C) 2.
PAGE 11
LT3010/LT3010-5 APPLICATIONS INFORMATION The thermal resistance junction-to-case (θJC), measured at the exposed pad on the back of the die, is 16°C/W. Continuous operation at large input/output voltage differentials and maximum load current is not practical due to thermal limitations. Transient operation at high input/output differentials is possible. The approximate thermal time constant for a 2500sq mm 3/32" FR-4 board with maximum topside and backside area for one ounce copper is 3 seconds.
PAGE 12
LT3010/LT3010-5 APPLICATIONS INFORMATION above 3Ω is unsuitable for use with the LT3010H. Ceramic capacitor manufacturers (Murata, AVX, TDK, and Vishay Vitramon at this writing) now offer ceramic capacitors that are rated to 150°C using an X8R dielectric. Device instability will occur if output capacitor value and ESR are outside design limits at elevated temperature and operating DC voltage bias (see information on capacitor characteristics under Output Capacitance and Transient Response).
PAGE 13
LT3010/LT3010-5 APPLICATIONS INFORMATION In circuits where a backup battery is required, several different input/output conditions can occur. The output voltage may be held up while the input is either pulled to ground, pulled to some intermediate voltage, or is left open circuit. Current flow back into the output will follow the curve shown in Figure 5. The rise in reverse output current above 7V occurs from the breakdown of the 7V clamp on the ADJ pin.
PAGE 14
LT3010/LT3010-5 TYPICAL APPLICATIONS 5V Buck Converter with Low Current Keep Alive Backup D2 D1N914 6 VIN 5.5V* TO 60V 4 C3 4.7µF 100V CERAMIC VIN BOOST SW 2 14 SHDN BIAS SYNC FB GND OPERATING CURRENT 5 IN LT3010-5 SHDN LOW HIGH OUT SENSE VOUT 5V 1A/50mA 10 R1 15.4k 12 R2 4.99k VC 1, 8, 9, 16 11 8 L1† 15µH D1 10MQ060N LT1766 15 C2 0.33µF + C1 100µF 10V SOLID TANTALUM CC 1nF 1 30105 TA03 * FOR INPUT VOLTAGES BELOW 7.
PAGE 15
LT3010/LT3010-5 TYPICAL APPLICATIONS LT3010 Telecom Application VIN 48V (72V TRANSIENT) IN 1µF OUT LT3010-5 SHDN NO PROTECTION DIODE NEEDED! SENSE 1µF GND + LOAD: SYSTEM MONITOR ETC OFF ON – BACKUP BATTERY 30105 TA05b Constant Brightness for Indicator LED over Wide Input Voltage Range RETURN OFF ON OUT IN 1µF LT3010 SHDN GND –48V 1µF ADJ ILED = 1.275V/RSET –48V CAN VARY FROM –4V TO –80V RSET 30105 TA06 30105fe 15 Downloaded from Arrow.com.
PAGE 16
LT3010/LT3010-5 PACKAGE DESCRIPTION MS8E Package 8-Lead Plastic MSOP, Exposed Die Pad (Reference LTC DWG # 05-08-1662 Rev I) BOTTOM VIEW OF EXPOSED PAD OPTION 1.88 (.074) 1 1.88 ± 0.102 (.074 ± .004) 0.29 REF 1.68 (.066) 0.889 ± 0.127 (.035 ± .005) 0.05 REF 5.23 (.206) MIN DETAIL “B” CORNER TAIL IS PART OF DETAIL “B” THE LEADFRAME FEATURE. FOR REFERENCE ONLY NO MEASUREMENT PURPOSE 1.68 ± 0.102 3.20 – 3.45 (.066 ± .004) (.126 – .136) 8 3.00 ± 0.102 (.118 ± .004) (NOTE 3) 0.65 (.0256) BSC 0.
PAGE 17
LT3010/LT3010-5 REVISION HISTORY (Revision history begins at Rev D) REV DATE DESCRIPTION PAGE NUMBER D 5/10 Added MP-Grade to All Sections Updated Related Parts List 18 E 4/11 Update MSOP Package Drawing 16 2 to 4, 10, 12 30105fe Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use.
PAGE 18
LT3010/LT3010-5 TYPICAL APPLICATION LT3010 Automotive Application VIN 12V (LATER 42V) + NO PROTECTION DIODE NEEDED! 1µF IN OUT LT3010-5 SENSE SHDN GND 1µF LOAD: CLOCK, SECURITY SYSTEM ETC OFF ON 30105 TA05a RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LT1676 60V, 440mA (IOUT), 100kHz, High Efficiency Step-Down DC/DC Converter VIN: 7.4V to 60V, VOUT = 1.24V, IQ = 3.2mA, ISD = 2.5µA, S8 Package LT1761 100mA, Low Noise Micropower, LDO VIN: 1.8V to 20V, VOUT = 1.22V, VDO = 0.