Datasheet

ManualsBrandsLINEAR TECHNOLOGY ManualsPMICsPMIC - LDO voltage regulator Positive, fixed MSOP 8

LT3020/LT3020-1.2/

LT3020-1.5/LT3020-1.8

3020fc

TEMPERATURE (°C)

–50

MINIMUM INPUT VOLTAGE (V)

1.1

1.0

0.9

0.8

0.6

0.7

0.5

0.4

0.3

0.2

0.1

3020 TA02

250–25 50 75

125100

= 100mA

APPLICATIO S

FEATURES

TYPICAL APPLICATIO

DESCRIPTIO

100mA, Low Voltage,

Very Low Dropout

Linear Regulator

■

Range: 0.9V to 10V

■

Minimum Input Voltage: 0.9V

■

Dropout Voltage: 150mV Typical

■

Output Current: 100mA

■

Adjustable Output (V

REF

= V

OUT(MIN)

= 200mV)

■

Fixed Output Voltages: 1.2V, 1.5V, 1.8V

■

Stable with Low ESR, Ceramic Output Capacitors

(2.2µF Minimum)

■

0.2% Load Regulation from 1mA to 100mA

■

Quiescent Current: 120µA (Typ)

■

3µA Typical Quiescent Current in Shutdown

■

Current Limit Protection

■

Reverse-Battery Protection

■

No Reverse Current

■

Thermal Limiting with Hysteresis

■

8-Lead DFN (3mm × 3mm) and MSOP Packages

1.8V to 1.5V, 100mA VLDO Regulator

■

Low Current Regulators

■

Battery-Powered Systems

■

Cellular Phones

■

Pagers

■

Wireless Modems

The LT

3020 is a very low dropout voltage (VLDO

) linear

regulator that operates from input supplies down to 0.9V.

This device supplies 100mA of output current with a

typical dropout voltage of 150mV. The LT3020 is ideal for

low input voltage to low output voltage applications,

providing comparable electrical efficiency to that of a

switching regulator.

The LT3020 regulator optimizes stability and transient

response with low ESR, ceramic output capacitors as

small as 2.2µF. Other LT3020 features include 0% typical

line regulation and 0.2% typical load regulation. In shut-

down, quiescent current drops to 3µA.

Internal protection circuitry includes reverse-battery pro-

tection, current limiting, thermal limiting with hysteresis,

and reverse-current protection. The LT3020 is available as

an adjustable output device with an output range down to

the 200mV reference. Three fixed output voltages, 1.2V,

1.5V and 1.8V, are also available.

The LT3020 regulator is available in the low profile

(0.75mm) 8-lead (3mm × 3mm) DFN package with Ex-

posed Pad and the 8-lead MSOP package.

SHDN

2.2µF

3020 TA01

OUT

1.8V

GND

LT3020-1.5

OUT

1.5V

100mA

2.2µF

Minimum Input Voltage

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

VLDO is a trademark of Linear Technology Corporation.

All other trademarks are the property of their respective owners.

Summary of content (16 pages)

PAGE 1
LT3020/LT3020-1.2/ LT3020-1.5/LT3020-1.8 100mA, Low Voltage, Very Low Dropout Linear Regulator U FEATURES DESCRIPTIO ■ The LT®3020 is a very low dropout voltage (VLDOTM) linear regulator that operates from input supplies down to 0.9V. This device supplies 100mA of output current with a typical dropout voltage of 150mV. The LT3020 is ideal for low input voltage to low output voltage applications, providing comparable electrical efficiency to that of a switching regulator.
PAGE 2
LT3020/LT3020-1.2/ LT3020-1.5/LT3020-1.8 W W W AXI U U ABSOLUTE RATI GS (Note 1) IN Pin Voltage ........................................................ ±10V OUT Pin Voltage .................................................... ±10V Input-to-Output Differential Voltage ....................... ±10V ADJ Pin Voltage .................................................... ±10V SHDN Pin Voltage ................................................. ±10V Output Short-Circut Duration ..........................
PAGE 3
LT3020/LT3020-1.2/ LT3020-1.5/LT3020-1.8 ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are TJ = 25°C. PARAMETER CONDITIONS MIN Minimum Input Voltage (Note 14) ILOAD = 100mA, TJ > 0°C ILOAD = 100mA, TJ < 0°C ADJ Pin Voltage (Notes 4, 5) Regulated Output Voltage (Note 4) VIN = 1.5V, ILOAD = 1mA 1.15V < VIN < 10V, 1mA < ILOAD < 100mA LT3020-1.2 LT3020-1.5 LT3020-1.8 UNITS 0.9 0.9 1.05 1.
PAGE 4
LT3020/LT3020-1.2/ LT3020-1.5/LT3020-1.8 ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are TJ = 25°C. PARAMETER Current Limit (Note 12) CONDITIONS VIN = 10V, VOUT = 0V VIN = VOUT(NOMINAL) + 0.5V, ∆VOUT = –5% MIN ● 110 TYP 360 310 MAX UNITS mA mA Input Reverse Leakage Current VIN = –10V, VOUT = 0V 1 10 µA Reverse Output Current (Notes 11, 13) VOUT = 1.2V, VIN = 0V LT3020-1.2 VOUT = 1.2V, VIN = 0V LT3020-1.
PAGE 5
LT3020/LT3020-1.2/ LT3020-1.5/LT3020-1.8 U W TYPICAL PERFOR A CE CHARACTERISTICS Dropout Voltage 250 225 225 TJ = 125°C 175 150 125 TJ = 25°C 100 75 IL = 100mA 175 150 IL = 50mA 125 IL = 10mA 100 75 50 25 25 IL = 1mA –25 0 25 50 75 TEMPERATURE (°C) 100 3020 G01 200 198 100 1.800 1.790 50 25 75 0 TEMPERATURE (°C) 100 125 1.
PAGE 6
LT3020/LT3020-1.2/ LT3020-1.5/LT3020-1.8 U W TYPICAL PERFOR A CE CHARACTERISTICS 2500 2250 800 TJ = 25°C 2000 700 600 500 400 300 0 1 3 4 5 6 7 INPUT VOLTAGE (V) 2 RL = 15Ω IL = 100mA 1500 1250 RL = 30Ω IL = 50mA 1000 750 RL = 150Ω IL = 10mA 500 RL = 1.5k IL = 1mA 9 1 2 3 4 5 6 7 INPUT VOLTAGE (V) 9 RL = 180Ω IL = 10mA 750 500 RL = 1.8k IL = 1mA 800 600 400 0 3 4 5 6 7 INPUT VOLTAGE (V) 8 9 3 4 5 6 7 INPUT VOLTAGE (V) 10 8 9 10 IL = 1mA 0.
PAGE 7
LT3020/LT3020-1.2/ LT3020-1.5/LT3020-1.8 U W TYPICAL PERFOR A CE CHARACTERISTICS Reverse Output Current Current Limit VOUT = 0V CURRENT LIMIT (mA) REVERSE OUTPUT CURRENT (µA) 450 400 VIN = 10V 350 VIN = 1.7V 300 Input Ripple Rejection 500 250 200 150 100 70 VIN = 0V 450 VOUT = 1.
PAGE 8
LT3020/LT3020-1.2/ LT3020-1.5/LT3020-1.8 U W TYPICAL PERFOR A CE CHARACTERISTICS RMS Output Noise vs Load Current (10Hz to 100kHz) 300 No-Load Recovery Threshold 18 VOUT = 1.2V COUT = 2.2µF 16 OUTPUT CURRENT SINK (mA) OUTPUT NOISE (µVRMS) 250 200 150 100 50 14 12 10 8 6 4 2 0 0.01 0.1 1 10 LOAD CURRENT (mA) 100 3020 G19 0 0 5 10 15 OUTPUT OVERSHOOT (%) 20 3020 G20 U U U PI FU CTIO S OUT (Pins 1, 2): These pins supply power to the load. Use a minimum output capacitor of 2.
PAGE 9
LT3020/LT3020-1.2/ LT3020-1.5/LT3020-1.8 W BLOCK DIAGRA IN (7, 8) SHDN (5) R3 THERMAL SHUTDOWN SHUTDOWN D1 – Q3 ERROR AMP + 200mV BIAS CURRENT AND REFERENCE GENERATOR CURRENT GAIN Q1 OUT (1, 2) D2 OUT SENSE (3) – 212mV NO-LOAD RECOVERY Q2 R2 + 25k NOTE: FOR LT3020 ADJUST PIN 3 IS CONNECTED TO THE ADJUST PIN, R1 AND R2 ARE EXTERNAL. FOR LT3020-1.X PIN 3 IS CONNECTED TO THE OUTPUT SENSE PIN, R1 AND R2 ARE INTERNAL. FIXED VOUT 1.2V 1.5V 1.
PAGE 10
LT3020/LT3020-1.2/ LT3020-1.5/LT3020-1.8 U W U U APPLICATIO S I FOR ATIO 20 an output current change of 1mA to 100mA is typically 0.4mV at VADJ = 200mV. At VOUT = 1.5V, load regulation is: The LT3020’s design is stable with a wide range of output capacitors, but is optimized for low ESR ceramic capacitors. The output capacitor’s ESR affects stability, most notably with small value capacitors. Use a minimum output capacitor of 2.2µF with an ESR of 0.3Ω or less to prevent oscillations.
PAGE 11
LT3020/LT3020-1.2/ LT3020-1.5/LT3020-1.8 U W U U APPLICATIO S I FOR ATIO response to light tapping from a pencil. Similar vibration induced behavior can masquerade as increased output voltage noise. No-Load/Light-Load Recovery A possible transient load step that occurs is where the output current changes from its maximum level to zero current or a very small load current. The output voltage responds by overshooting until the regulator lowers the amount of current it delivers to the new level.
PAGE 12
LT3020/LT3020-1.2/ LT3020-1.5/LT3020-1.8 U W U U APPLICATIO S I FOR ATIO Table 2. Measured Thermal Resistance for MS8 Package COPPER AREA TOPSIDE* BACKSIDE BOARD AREA THERMAL RESISTANCE (JUNCTION-TO-AMBIENT) 2500mm2 2500mm2 2500mm2 110°C/W 2 2 2500mm2 115°C/W 2 2 120°C/W 2 130°C/W 2 140°C/W 1000mm 2 225mm 2 100mm 50mm 2 2500mm 2500mm 2 2500mm 2 2500mm 2500mm 2500mm 2500mm *Device is mounted on topside.
PAGE 13
LT3020/LT3020-1.2/ LT3020-1.5/LT3020-1.8 U W U U APPLICATIO S I FOR ATIO and the output voltage clamps at a Schottky diode above ground. Please note that the behavior described above applies to the LT3020 only. If a resistor divider is connected under the same conditions, there will be additional V/R current. of a wire does not have a major influence on its selfinductance. For example, the self inductance of a 2-AWG isolated wire with a diameter of 0.26 in.
PAGE 14
LT3020/LT3020-1.2/ LT3020-1.5/LT3020-1.8 U PACKAGE DESCRIPTIO DD Package 8-Lead Plastic DFN (3mm × 3mm) (Reference LTC DWG # 05-08-1698) 0.675 ±0.05 3.5 ±0.05 1.65 ±0.05 2.15 ±0.05 (2 SIDES) PACKAGE OUTLINE 0.25 ± 0.05 0.50 BSC 2.38 ±0.05 (2 SIDES) RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS 3.00 ±0.10 (4 SIDES) R = 0.115 TYP 5 0.38 ± 0.10 8 1.65 ± 0.10 (2 SIDES) PIN 1 TOP MARK (NOTE 6) (DD8) DFN 1203 0.200 REF 0.75 ±0.05 0.00 – 0.05 4 0.25 ± 0.05 1 0.50 BSC 2.38 ±0.
PAGE 15
LT3020/LT3020-1.2/ LT3020-1.5/LT3020-1.8 U PACKAGE DESCRIPTIO MS8 Package 8-Lead Plastic MSOP (Reference LTC DWG # 05-08-1660) 0.889 ± 0.127 (.035 ± .005) 5.23 (.206) MIN 3.20 – 3.45 (.126 – .136) 0.42 ± 0.038 (.0165 ± .0015) TYP 3.00 ± 0.102 (.118 ± .004) (NOTE 3) 0.65 (.0256) BSC 8 7 6 5 0.52 (.0205) REF RECOMMENDED SOLDER PAD LAYOUT 0.254 (.010) 3.00 ± 0.102 (.118 ± .004) (NOTE 4) 4.90 ± 0.152 (.193 ± .006) DETAIL “A” 0° – 6° TYP GAUGE PLANE 0.53 ± 0.152 (.021 ± .
PAGE 16
LT3020/LT3020-1.2/ LT3020-1.5/LT3020-1.8 RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LT1121/LT1121HV 150mA, Micropower LDOs VIN: 4.2V to 30V/36V, VOUT(MIN) = 3.75V, VDO = 0.42V, IQ = 30µA, ISD = 16µA, Reverse-Battery Protection, SOT-223, S8, Z Packages LT1129 700mA, Micropower LDO VIN: 4.2V to 30V, VOUT(MIN) = 3.75V, VDO = 0.4V, IQ = 50µA, ISD = 16µA, DD, SOT-223, S8, TO220-5, TSSOP20 Packages LT1761 100mA, Low Noise Micropower LDO VIN: 1.8V to 20V, VOUT(MIN) = 1.22V, VDO = 0.