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LT3022/LT3022-1.2

LT3022-1.5/LT3022-1.8

3022fb

TYPICAL APPLICATION

FEATURES DESCRIPTION

1A, 0.9V to 10V,

Very Low Dropout

Linear Regulator

The LT

3022 is a very low dropout voltage (VLDO™) linear

regulator that operates from single input supplies down to

0.9V. The device supplies 1A output current with 145mV

typical dropout voltage. The LT3022 is ideal for low input

voltage to low output voltage applications, providing

comparable electrical efﬁciency to a switching regulator.

The regulator optimizes stability and transient response

with low ESR ceramic output capacitors as small as 10µF.

Other LT3022 features include 0.05% typical line regulation

and 0.05% typical load regulation. In shutdown, quiescent

current typically drops to 7.5µA. Internal protection circuitry

includes reverse-battery protection, current limiting, ther-

mal limiting with hysteresis and reverse-current protection.

The LT3022 is available as an adjustable device with

an output voltage range down to the 200mV reference.

Three ﬁxed output voltages, 1.2V, 1.5V and 1.8V are also

offered. The LT3022 regulator is available in the thermally

enhanced low proﬁle (0.75mm) 16-lead (5mm × 3mm)

DFN and MSOP packages.

1.2V to 0.9V, 1A VLDO Regulator

APPLICATIONS

Range: 0.9V to 10V

Dropout Voltage: 145mV Typical

Output Current: 1A

Adjustable Output (V

REF

= V

OUT(MIN)

= 200mV)

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

Stable with Low ESR, Ceramic Output Capacitors

(10µF Minimum)

0.05% Typical Load Regulation from 1mA to 1A

Quiescent Current: 400µA Typical

7.5µA Typical Quiescent Current in Shutdown

Current Limit Protection

Reverse-Battery Protection with No Reverse Current

Thermal Limiting with Hysteresis

16-Lead (5mm × 3mm) DFN and MSOP Packages

High Efﬁciency Linear Regulators

Battery-Powered Systems

Logic Supplies

Post Regulator for Switching Supplies

Wireless Modems

FPGA Core Supplies

L, LT, LTC, LTM, Linear Technology and the Linear logo 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.

10µF

1.2V

OUT

0.9V

LT3022

SHDN

698Ω

200Ω

OUT

ADJ

GND

10µF

3022 TA01a

Minimum Input Voltage

TEMPERATURE (°C)

–50

MINIMUM INPUT VOLTAGE (V)

0.3

0.9

1.0

1.1

3022 TA01b

0.1

0.7

0.5

0.2

0.8

0.6

0.4

–25

100

125

= 1A

Summary of content (20 pages)

PAGE 1
LT3022/LT3022-1.2 LT3022-1.5/LT3022-1.8 1A, 0.9V to 10V, Very Low Dropout Linear Regulator FEATURES n n n n n n n n n n n n n DESCRIPTION VIN Range: 0.9V to 10V Dropout Voltage: 145mV Typical Output Current: 1A Adjustable Output (VREF = VOUT(MIN) = 200mV) Fixed Output Voltages: 1.2V, 1.5V, 1.8V Stable with Low ESR, Ceramic Output Capacitors (10µF Minimum) 0.05% Typical Load Regulation from 1mA to 1A Quiescent Current: 400µA Typical 7.
PAGE 2
LT3022/LT3022-1.2 LT3022-1.5/LT3022-1.8 ABSOLUTE MAXIMUM RATINGS (Note 1) IN Pin Voltage......................................................... ±10V OUT Pin Voltage...................................................... ±10V Input-to-Output Differential Voltage........................ ±10V ADJ/SENSE Pin Voltage.......................................... ±10V SHDN Pin Voltage................................................... ±10V Output Short-Circuit Duration..........................
PAGE 3
LT3022/LT3022-1.2 LT3022-1.5/LT3022-1.8 ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LT3022EDHC#PBF LT3022EDHC#TRPBF 3022 16-Lead (5mm × 3mm) Plastic DFN –40°C to 125°C LT3022IDHC#PBF LT3022IDHC#TRPBF 3022 16-Lead (5mm × 3mm) Plastic DFN –40°C to 125°C LT3022EMSE#PBF LT3022EMSE#TRPBF 3022 16-Lead Plastic MSOP –40°C to 125°C LT3022IMSE#PBF LT3022IMSE#TRPBF 3022 16-Lead Plastic MSOP –40°C to 125°C LT3022EMSE-1.
PAGE 4
LT3022/LT3022-1.2 LT3022-1.5/LT3022-1.8 ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. PARAMETER CONDITIONS Minimum Input Voltage (Notes 4, 6) ILOAD = 1A, TA > 0°C ILOAD = 1A, TA ≤ 0°C ADJ Pin Voltage (Notes 5, 6) VIN = 1.5V, ILOAD = 1mA 1.15V < VIN < 10V, 1mA < ILOAD < 1A Regulated Output Voltage (Note 5) LT3022-1.2 LT3022-1.5 LT3022-1.8 MIN 1.05 1.10 V V mV mV 204 206 VIN = 1.
PAGE 5
LT3022/LT3022-1.2 LT3022-1.5/LT3022-1.8 ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. PARAMETER CONDITIONS Ripple Rejection (Note 13) LT3022 Current Limit (Note 9) MIN TYP VIN – VOUT = 1V, VRIPPLE = 0.5VP-P , fRIPPLE = 120Hz, ILOAD = 1A 55 70 dB LT3022-1.2 VIN – VOUT = 1V, VRIPPLE = 0.5VP-P , fRIPPLE = 120Hz, ILOAD = 1A 51 66 dB LT3022-1.5 VIN – VOUT = 1V, VRIPPLE = 0.
PAGE 6
LT3022/LT3022-1.2 LT3022-1.5/LT3022-1.8 TYPICAL PERFORMANCE CHARACTERISTICS VOUT = 1.2V GUARANTEED DROPOUT VOLTAGE (mV) DROPOUT VOLTAGE (mV) 270 Guaranteed Dropout Voltage 300 240 210 TJ = 125°C 180 150 TJ = 25°C 120 90 TJ = –40°C 60 30 0 = TEST POINTS 270 240 270 TJ = 125°C 210 180 150 TJ = 25°C 120 90 60 IL = 1A 150 90 0.6 0.5 0.4 0.3 IL = 100mA 60 IL = 10mA –25 50 25 0 75 TEMPERATURE (°C) 0.2 100 125 Output Voltage 1.236 IL = 1mA IL = 1mA 1.224 OUTPUT VOLTAGE (V) 0.
PAGE 7
LT3022/LT3022-1.2 LT3022-1.5/LT3022-1.8 TYPICAL PERFORMANCE CHARACTERISTICS Quiescent Current 90 900 80 800 70 60 50 40 30 20 10 VIN = 6V VOUT = 1.2V IL = 0 600 VSHDN = VIN 500 50 25 0 75 TEMPERATURE (°C) –25 100 400 300 200 50 25 0 75 TEMPERATURE (°C) –25 VSHDN = VIN 2.0 1.5 VSHDN = 0V 0 1 2 3 4 5 6 7 INPUT VOLTAGE (V) 4.0 3.0 9 2.5 2.0 1.5 1.0 0 10 1 0 2 9 RL = 150Ω R = 1.5k L IL = 10mA I = 1mA L RL = 15Ω IL = 100mA 6 3 0 1 2 8 9 10 RL = 1.2Ω IL = 1A 15 12 RL = 2.
PAGE 8
LT3022/LT3022-1.2 LT3022-1.5/LT3022-1.8 TYPICAL PERFORMANCE CHARACTERISTICS GND Pin Current vs ILOAD SHDN Pin Threshold 1.0 0.9 SHDN PIN THRESHOLD (V) GND PIN CURRENT (mA) VIN = 1.6V 21 VOUT = 1.2V VSHDN = 10V 18 TJ = 25°C 15 12 9 6 3 0 SHDN Pin Input Current 5.0 IL = 1mA 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 –25 50 25 0 75 TEMPERATURE (°C) 100 3022 G14 2.7 4 3 2 1 100 1.5 1.2 0.
PAGE 9
LT3022/LT3022-1.2 LT3022-1.5/LT3022-1.8 TYPICAL PERFORMANCE CHARACTERISTICS Line Regulation 90 0.3 80 0.1 70 60 50 40 30 VIN = 1.5V + 0.5VP-P RIPPLE AT 120Hz VOUT = 0.5V COUT = 10µF IL = 1A 20 10 0 –50 50 25 0 75 TEMPERATURE (°C) –25 Load Regulation 1.0 ∆VIN = 1.15V TO 10V VOUT = 0.2V IL = 1mA –0.1 –0.3 –0.5 –0.7 –0.9 –1.1 –1.
PAGE 10
LT3022/LT3022-1.2 LT3022-1.5/LT3022-1.8 PIN FUNCTIONS NC (Pins 1, 2, 8, 15, 16): No Connect Pins. These pins have no connection to internal circuitry. These pins may be floated, tied to VIN or tied to GND for improved thermal performance. PGND (Pins 10, 11): Power Ground. The majority of ground pin current flows out of PGND. Tie these pins directly to AGND (Pins 6, 7) and the exposed backside GND (Pin 17). OUT (Pins 3, 4): These pins supply power to the load.
PAGE 11
LT3022/LT3022-1.2 LT3022-1.5/LT3022-1.8 BLOCK DIAGRAM 9 SHDN IN THERMAL SHUTDOWN SHUTDOWN R3 D1 – 200mV BIAS CURRENT AND REFERENCE GENERATOR 213mV ERROR AMP + Q3 CURRENT GAIN Q1 PGND OUT 10, 11 3, 4 D2 – NO-LOAD RECOVERY Q2 + NOTE: FOR LT3022 ADJ PIN (5) IS CONNECTED TO THE ADJ PIN, R1 AND R2 ARE EXTERNAL. FOR LT3022-1.X PIN (5) IS CONNECTED TO THE SENSE PIN, R1 AND R2 ARE INTERNAL. TIE PGND, AGND AND THE EXPOSED PAD TOGETHER. 12, 13, 14 SENSE R2 25k IDEAL DIODE FIXED VOUT 1.2V 1.5V 1.
PAGE 12
LT3022/LT3022-1.2 LT3022-1.5/LT3022-1.8 APPLICATIONS INFORMATION The LT3022 very low dropout linear regulator is capable of 0.9V input supply operation. It supplies 1A output current and dropout voltage is typically 145mV. Quiescent current is typically 400µA and drops to 7.5µA in shutdown. The LT3022 incorporates several protection features, making it ideal for use in battery-powered systems. The device protects itself against reverse-input and reverse-output voltages.
PAGE 13
LT3022/LT3022-1.2 LT3022-1.5/LT3022-1.8 APPLICATIONS INFORMATION and are more suitable for use as the output capacitor at fractionally increased cost. X5R and X7R dielectrics both exhibit excellent voltage coefficient characteristics. X7R works over a larger temperature range and exhibits better temperature stability whereas X5R is less expensive and is available in higher values. Figures 2 and 3 show voltage coefficient and temperature coefficient comparisons between Y5V and X5R material.
PAGE 14
LT3022/LT3022-1.2 LT3022-1.5/LT3022-1.8 APPLICATIONS INFORMATION To eliminate this problem, the LT3022 incorporates a no-load or light load recovery circuit. This circuit is a voltage-controlled current sink that significantly improves the light load transient response time by discharging the output capacitor quickly and then turning off. The current sink turns on when the output voltage exceeds 6.5% of the nominal output voltage.
PAGE 15
LT3022/LT3022-1.2 LT3022-1.5/LT3022-1.8 APPLICATIONS INFORMATION Calculating Junction Temperature Example: Given an output voltage of 1.5V, an input voltage range of 1.7V to 1.9V, an output load current range of 1mA to 1A and a maximum ambient temperature of 85°C, what is the maximum junction temperature for an application using the DHC package? The power dissipated by the device equals: ILOAD(MAX) • (VIN(MAX) – VOUT) + IGND • (VIN(MAX)) where: ILOAD(MAX) = 1A VIN(MAX) = 1.9V IGND at (ILOAD = 1A, VIN = 1.
PAGE 16
LT3022/LT3022-1.2 LT3022-1.5/LT3022-1.8 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. In the case where the input is grounded, there is less than 1µA of reverse output current.
PAGE 17
LT3022/LT3022-1.2 LT3022-1.5/LT3022-1.8 PACKAGE DESCRIPTION DHC Package 16-Lead Plastic DFN (5mm × 3mm) (Reference LTC DWG # 05-08-1706) 0.65 ±0.05 3.50 ±0.05 1.65 ±0.05 2.20 ±0.05 (2 SIDES) PACKAGE OUTLINE 0.25 ± 0.05 0.50 BSC 4.40 ±0.05 (2 SIDES) RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS 5.00 ±0.10 (2 SIDES) R = 0.20 TYP 3.00 ±0.10 (2 SIDES) 9 R = 0.115 TYP 0.40 ± 0.10 16 1.65 ± 0.10 (2 SIDES) PIN 1 TOP MARK (SEE NOTE 6) PIN 1 NOTCH 0.200 REF 0.75 ±0.05 0.00 – 0.05 8 1 0.25 ± 0.05 0.
PAGE 18
LT3022/LT3022-1.2 LT3022-1.5/LT3022-1.8 PACKAGE DESCRIPTION MSE Package 16-Lead Plastic MSOP, Exposed Die Pad (Reference LTC DWG # 05-08-1667 Rev E) BOTTOM VIEW OF EXPOSED PAD OPTION 2.845 ± 0.102 (.112 ± .004) 5.23 (.206) MIN 2.845 ± 0.102 (.112 ± .004) 0.889 ± 0.127 (.035 ± .005) 8 1 1.651 ± 0.102 (.065 ± .004) 1.651 ± 0.102 3.20 – 3.45 (.065 ± .004) (.126 – .136) 0.305 ± 0.038 (.0120 ± .0015) TYP 16 0.50 (.0197) BSC 4.039 ± 0.102 (.159 ± .004) (NOTE 3) RECOMMENDED SOLDER PAD LAYOUT 0.254 (.
PAGE 19
LT3022/LT3022-1.2 LT3022-1.5/LT3022-1.8 REVISION HISTORY REV DATE DESCRIPTION PAGE NUMBER A 9/10 Added -1.2, -1.5, and -1.8 fixed voltage options B 02/12 Revised Max value for Input Reverse Leakage Current 5 Updated the 16-lead MSE package 18 1 to 6, 10, 20 3022fb Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use.
PAGE 20
LT3022/LT3022-1.2 LT3022-1.5/LT3022-1.8 TYPICAL APPLICATION 1.5V to 1.2V, 1A VLDO Regulator VIN 1.5V IN 10µF VOUT 1.2V 10µF 1A OUT LT3022-1.2 RLD 1.2K* SHDN SENSE GND 3022 TA02 *RLD: OPTIONAL (TO SATISFY 1mA MINIMUM LOAD CURRENT REQUIREMENT) RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LT3020 100mA, Low Voltage VLDO Linear Regulator VIN: 0.9V to 10V, VOUT : 0.2V to 9.5V, VDO = 0.15V, IQ = 120µA, Noise: <250µVRMS, Stable with 2.