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LT3013

3013fe

TYPICAL APPLICATION

DESCRIPTION

250mA, 4V to 80V

Low Dropout Micropower

Linear Regulator with PWRGD

The LT

3013 is a high voltage, micropower low dropout

linear regulator. The device is capable of supplying 250mA

of output current with a dropout voltage of 400mV. Designed

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

quiescent current (65µA operating and 1µA in shutdown)

makes the LT3013 an ideal choice. Quiescent current is

also well controlled in dropout.

Other features of the LT3013 include a PWRGD ﬂ ag to

indicate output regulation. The delay between regulated

output level and ﬂ ag indication is programmable with

a single capacitor. The LT3013 also has the ability to

operate with very small output capacitors. The regulator

is stable with only 3.3µF on the output while most older

devices require between 10µF and 100µF for stability.

Small ceramic capacitors can be used without any need

for series resistance (ESR) as is common with other

regulators. Internal protection circuitry includes reverse-

battery protection, current limiting, thermal limiting and

reverse current protection.

The device is available with an adjustable output with a

1.24V reference voltage. The LT3013 regulator is available

in the thermally enhanced 16-lead TSSOP and the low

proﬁ le (0.75mm), 12-pin (4mm × 3mm) DFN package,

both providing excellent thermal characteristics.

, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.

All other trademarks are the property of their respective owners.

FEATURES

APPLICATIONS

Wide Input Voltage Range: 4V to 80V

Low Quiescent Current: 65μA

Low Dropout Voltage: 400mV

Output Current: 250mA

No Protection Diodes Needed

Adjustable Output from 1.24V to 60V

1µA Quiescent Current in Shutdown

Stable with 3.3µF Output Capacitor

Stable with Aluminum, Tantalum or Ceramic

Capacitors

Reverse-Battery Protection

No Reverse Current Flow from Output to Input

Thermal Limiting

Thermally Enhanced 16-Lead TSSOP and

12-Pin (4mm × 3mm) DFN Package

Low Current High Voltage Regulators

Regulator for Battery-Powered Systems

Telecom Applications

Automotive Applications

5V Supply with Shutdown

1µF

5.4V TO

80V

3013 TA01

OUT

250mA

SHDN

<0.3V

>2.0V

OUTPUT

OFF

3.3µF

750k

249k

1.6M

LT3013

SHDN

PWRGD

OUT

ADJ

GND

1000pF

OUTPUT CURRENT (mA)

250

300

400

350

200

3013 TA02

200

150

50 100 150 250

100

DROPOUT VOLTAGE (mV)

Dropout Voltage

Summary of content (20 pages)

PAGE 1
LT3013 250mA, 4V to 80V Low Dropout Micropower Linear Regulator with PWRGD DESCRIPTION FEATURES n n n n n n n n n n n n n Wide Input Voltage Range: 4V to 80V Low Quiescent Current: 65μA Low Dropout Voltage: 400mV Output Current: 250mA No Protection Diodes Needed Adjustable Output from 1.24V to 60V 1μA Quiescent Current in Shutdown Stable with 3.
PAGE 2
LT3013 ABSOLUTE MAXIMUM RATINGS (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 CT Pin Voltage .................................................7V, –0.5V PWRGD Pin Voltage ...........
PAGE 3
LT3013 ELECTRICAL CHARACTERISTICS (LT3013E, LT3013MP) The l denotes the speciﬁcations which apply over the full operating temperature range, otherwise speciﬁcations are at TJ = 25°C. PARAMETER CONDITIONS MIN TYP 4 4.75 V 1.225 1.2 1.24 1.24 1.255 1.28 V V 0.1 5 mV 7 12 25 mV mV 160 230 300 mV mV 250 340 420 mV mV 400 490 620 mV mV 65 3 10 120 μA mA mA l Minimum Input Voltage ILOAD = 250mA ADJ Pin Voltage (Notes 2,3) VIN = 4V, ILOAD = 1mA 4.
PAGE 4
LT3013 ELECTRICAL CHARACTERISTICS (LT3013H) The l denotes the speciﬁcations which apply over the –40°C to 140°C operating temperature range, otherwise speciﬁcations are at TJ = 25°C. PARAMETER CONDITIONS Dropout Voltage VIN = VOUT(NOMINAL) (Notes 4, 5) ILOAD = 10mA ILOAD = 10mA l ILOAD = 50mA ILOAD = 50mA l ILOAD = 200mA ILOAD = 200mA l GND Pin Current VIN = 4.
PAGE 5
LT3013 TYPICAL PERFORMANCE CHARACTERISTICS Typical Dropout Voltage Guaranteed Dropout Voltage 600 400 TJ = 25°C 300 200 100 TJ ≤ 125°C 500 500 400 TJ ≤ 25°C 300 200 100 100 150 200 OUTPUT CURRENT (mA) 0 250 IL = 100mA 400 300 IL = 50mA IL = 10mA 200 0 50 0 IL = 250mA IL = 1mA 100 50 100 200 150 OUTPUT CURRENT (mA) 0 –50 –25 250 0 25 50 75 100 125 150 TEMPERATURE (°C) 3013 G02 3013 G01 Quiescent Current 3013 G03 ADJ Pin Voltage 120 1.
PAGE 6
LT3013 TYPICAL PERFORMANCE CHARACTERISTICS Quiescent Current 60 QUIESCENT CURRENT (μA) TJ = 25°C RL = ∞ 70 QUIESCENT CURRENT (μA) Quiescent Current VSHDN = VIN 50 40 30 20 10 TJ = 25°C 225 RL = ∞ VOUT = 1.24V 200 150 1 2 VSHDN = VIN 125 100 75 VSHDN = GND 50 3 4 5 6 7 INPUT VOLTAGE (V) 8 9 10 0 10 20 30 40 50 60 INPUT VOLTAGE (V) 70 GND PIN CURRENT (mA) GND PIN CURRENT (mA) 1 2 3 4 5 6 7 INPUT VOLTAGE (V) 8 9 10 3013 G07 VIN = 4.75V 9 TJ = 25°C 6 5 RL = 12.
PAGE 7
LT3013 TYPICAL PERFORMANCE CHARACTERISTICS SHDN Pin Threshold 0.6 0.6 SHDN PIN CURRENT (μA) 1.6 OFF-TO-ON 1.4 1.2 1.0 ON-TO-OFF 0.8 0.6 0.4 SHDN PIN CURRENT (μA) TJ = 25°C CURRENT FLOWS 0.5 OUT OF SHDN PIN 1.8 0.4 0.3 0.2 0.1 VIN = 6V VSHDN = 0V 0.5 CURRENT FLOWS OUT OF SHDN PIN 0.4 0.3 0.2 0.1 0.2 0 –50 –25 0 0 25 50 75 100 125 150 TEMPERATURE (°C) 0 3013 G10 0.5 1.0 2.0 1.5 2.5 SHDN PIN VOLTAGE (V) 3.
PAGE 8
LT3013 TYPICAL PERFORMANCE CHARACTERISTICS PWRGD Output Low Voltage CT Charging Current 4.0 IPWRGD = 50μA 180 CT Comparator Thresholds 2.0 PWRGD TRIPPED HIGH 160 140 120 100 80 60 40 CT COMPARATOR THRESHOLDS (V) 3.5 CT CHARGING CURRENT (μA) PWRGD OUTPUT LOW VOLTAGE (mV) 200 3.0 2.5 2.0 1.5 1.0 0.5 20 0 –50 –25 0 0 –50 –25 25 50 75 100 125 150 TEMPERATURE (°C) 3013 G26 0 1.4 1.2 1.0 0.8 0.6 0.4 VCT (LOW) 0.
PAGE 9
LT3013 TYPICAL PERFORMANCE CHARACTERISTICS Reverse Output Current Reverse Output Current 120 140 120 CURRENT FLOWS INTO OUTPUT PIN 100 ADJ PIN CLAMP (SEE APPLICATIONS INFORMATION) 80 60 40 Input Ripple Rejection 92 VIN = 0V VOUT = VADJ = 1.24V 88 100 RIPPLE REJECTION (dB) REVERSE OUTPUT CURRENT (μA) TJ = 25°C 180 VIN = 0V VOUT = VADJ 160 80 60 40 20 0 1 2 3 4 5 6 7 8 OUTPUT VOLTAGE (V) 9 0 –50 –25 10 0 25 50 75 100 125 150 TEMPERATURE (°C) Input Ripple Rejection 5.0 VIN = 4.
PAGE 10
LT3013 TYPICAL PERFORMANCE CHARACTERISTICS LOAD REGULATION (mV) –2 Output Noise Spectral Density OUTPUT NOISE SPECTRAL DENSITY (μV/√Hz) Load Regulation 0 ΔIL = 1mA TO 250mA –4 –6 –8 –10 –12 –14 –16 –18 –20 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) 10 COUT = 3.3μF ILOAD = 250mA 1 0.1 0.01 10 100 1k 10k FREQUENCY (Hz) 100k 3013 G21 10Hz to 100kHz Output Noise Transient Response VOUT 100μV/DIV COUT = 10μF IL = 250mA VOUT = 1.
PAGE 11
LT3013 PIN FUNCTIONS (DFN Package)/(TSSOP Package) NC (Pins 1, 9, 12)/(Pins 2, 12, 15): No Connect. These pins have no internal connection; connecting NC pins to a copper area for heat dissipation provides a small improvement in thermal performance. OUT (Pins 2, 3)/(Pins 3, 4): Output. The output supplies power to the load. A minimum output capacitor of 3.3μF is required to prevent oscillations.
PAGE 12
LT3013 APPLICATIONS INFORMATION The LT3013 is a 250mA high voltage low dropout regulator with micropower quiescent current and shutdown. The device is capable of supplying 250mA at a dropout voltage of 400mV. The low operating quiescent current (65μA) drops to 1μA in shutdown. In addition to the low quiescent current, the LT3013 incorporates several protection features which make it ideal for use in battery-powered systems. The device is protected against both reverse input and reverse output voltages.
PAGE 13
LT3013 APPLICATIONS INFORMATION Extra consideration must be given to the use of ceramic capacitors. Ceramic capacitors are manufactured with a variety of dielectrics, each with different behavior across temperature and applied voltage. The most common dielectrics used are speciﬁed with EIA temperature characteristic codes of Z5U, Y5V, X5R and X7R.
PAGE 14
LT3013 APPLICATIONS INFORMATION Figure 4 shows a block diagram of the PWRGD circuit. At startup, the timing capacitor is discharged and the PWRGD pin will be held low. As the output voltage increases and the ADJ pin crosses the 90% threshold, the JK ﬂip-ﬂop is reset, and the 3μA current source begins to charge the timing capacitor. Once the voltage on the CT pin reaches the VCT(HIGH) threshold (approximately 1.7V at 25°C), the capacitor voltage is clamped and the PWRGD pin is set to a high impedance state.
PAGE 15
LT3013 APPLICATIONS INFORMATION For surface mount devices, heat sinking is accomplished by using the heat spreading capabilities of the PC board and its copper traces. Copper board stiffeners and plated through-holes can also be used to spread the heat generated by power devices. The following tables list thermal resistance for several different board sizes and copper areas. All measurements were taken in still air on 3/32” FR-4 board with one ounce copper. Table 1.
PAGE 16
LT3013 APPLICATIONS INFORMATION Operation at the different power levels is as follows: 76% operation at P1, 19% for P2, 4% for P3, and 1% for P4. PEFF = 76%(0.23W) + 19%(8.98W) + 4%(0.35W) + 1%(13.98W) = 2.03W With a thermal resistance in the range of 40°C/W to 62°C/W, this translates to a junction temperature rise above ambient of 81°C to 125°C. High Temperature Operation Care must be taken when designing LT3013 applications to operate at high ambient temperatures.
PAGE 17
LT3013 APPLICATIONS INFORMATION In situations where the ADJ pin is connected to a resistor divider that would pull the ADJ pin above its 7V clamp voltage if the output is pulled high, the ADJ pin input current must be limited to less than 5mA. For example, a resistor divider is used to provide a regulated 1.5V output from the 1.24V reference when the output is forced to 60V.
PAGE 18
LT3013 TYPICAL APPLICATIONS 5V Buck Converter with Low Current Keep Alive Backup D2 D1N914 6 4 C3 4.7μF 100V CERAMIC BOOST VIN SW 2 Buck Converter Efﬁciency vs Load Current L1† 15μH VOUT 5V 1A/250mA D1 10MQ060N LT1766 100 14 SHDN BIAS SYNC FB GND R1 15.4k 12 + R2 4.99k VC C1 100μF 10V SOLID TANTALUM CC 1nF 14 LOW HIGH 100k VIN = 10V 10 1, 8, 9, 16 11 OPERATING CURRENT VOUT = 5V L = 68μH 90 15 EFFICIENCY (%) VIN 5.5V* TO 60V C2 0.
PAGE 19
LT3013 PACKAGE DESCRIPTION DE Package 12-Lead Plastic DFN (4mm × 3mm) (Reference LTC DWG # 05-08-1695) 4.00 ±0.10 (2 SIDES) 7 0.65 ±0.05 3.50 ±0.05 1.70 ±0.05 2.20 ±0.05 (2 SIDES) R = 0.115 TYP 0.38 ± 0.10 12 R = 0.20 TYP 1.70 ± 0.10 (2 SIDES) 3.00 ±0.10 (2 SIDES) PIN 1 TOP MARK (NOTE 6) PACKAGE OUTLINE PIN 1 NOTCH (UE12/DE12) DFN 0603 3.30 ±0.05 (2 SIDES) 6 0.25 ± 0.05 0.75 ±0.05 0.200 REF 0.25 ± 0.05 0.50 BSC 3.30 ±0.10 (2 SIDES) 0.00 – 0.05 1 0.
PAGE 20
LT3013 TYPICAL APPLICATION Constant Brightness for Indicator LED over Wide Input Voltage Range RETURN IN 1μF OUT LT3013 SHDN OFF ON GND –48V CAN VARY FROM –4V TO –80V –48V ILED = 1.24V/RSET 3.3μF ADJ RSET 3013 TA06 RELATED PARTS PART NUMBER DESCRIPTION LT1020 125mA, Micropower Regulator and Comparator VIN: 4.5V to 36V, VOUT(MIN) = 2.5V, VDO = 0.4V, IQ = 40μA, ISD = 40μA, Comparator and Reference, Class B Outputs, S16, PDIP14 Packages 125mA, Micropower Regulator and Comparator VIN: 4.