LT1764_1 LINER | Alldatasheet
Document overview
- Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
- PDF pages: 20
Technical content
3A, Fast Transient Response, Low Noise, LDO Regulators ■ Optimized for Fast Transient Response ■ Output Current: 3A ■ Dropout Voltage: 340mV at 3A ■ Low Noise: 40µVRMS (10Hz to 100kHz) ■ 1mA Quiescent Current ■ Wide Input Voltage Range: 2.7V to 20V ■ No Protection Diodes Needed ■ Controlled Quiescent Current in Dropout ■ Fixed Output Voltages: 1.5V, 1.8V, 2.5V, 3.3V ■ Adjustable Output from 1.21V to 20V ■ <1 µA Quiescent Current in Shutdown ■ Stable with 10µF Output Capacitor ■ Reverse Battery Protection ■ No Reverse Current ■ Thermal Limiting ■ Available in 5-Lead TO-220, DD and 16-Lead TSSOP Packages The LT 1764 is a low dropout regulator optimized for fast transient response. The device is capable of supplying 3A of output current with a dropout voltage of 340mV. Oper- ating quiescent current is 1mA, dropping to < 1 µA in shutdown. Quiescent current is well controlled; it does not rise in dropout as it does with many other regulators. In addition to fast transient response, the LT1764 has very low output voltage noise which makes the device ideal for sensitive RF supply applications. Output voltage range is from 1.21V to 20V. The LT1764 regulators are stable with output capacitors as low as 10µF. Internal protection circuitry includes reverse battery pro- tection, current limiting, thermal limiting and reverse cur- rent protection. The device is available in fixed output voltages of 1.5V, 1.8V, 2.5V, 3.3V and as an adjustable device with a 1.21V reference voltage. The LT1764 regu- lators are available in 5-lead TO-220, DD and Exposed Pad 16-lead TSSOP packages. Dropout Voltage 3.3VIN to 2.5VOUT Regulator ■ 3.3V to 2.5V Logic Power Supply ■ Post Regulator for Switching Supplies FEATURES DESCRIPTIO U APPLICATIO SU TYPICAL APPLICATIO U IN SHDN 10µF
1764 TA01
VIN > 3V SENSE GND LT1764-2.5 2.5V 10µF LOAD CURRENT (A) 0 0.5 DROPOUT VOLTAGE (mV)
1764 TA02
, LTC and LT are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 6144250, 6118263.
ABSOLUTE MAXIMUM RATINGSW WW U PACKAGE/ORDER INFORMATIONW UU (Note 1) Operating Junction Temperature Range – 40°C to 125°C Consult LTC Marketing for parts specified with wider operating temperature ranges. Order Options Tape and Reel: Add #TR Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF Lead Free Part Marking: http://www.linear.com/leadfree/ LT1764ET LT1764ET-1.5 LT1764ET-1.8 LT1764ET-2.5 LT1764ET-3.3 ORDER PART NUMBER LT1764EQ LT1764EQ-1.5 LT1764EQ-1.8 LT1764EQ-2.5 LT1764EQ-3.3 ORDER PART NUMBER TJMAX = 150°C, θJA = 30°C/ W *PIN 5 = SENSE FOR LT1764-1.5/LT1764-1.8/ LT1764-2.5/LT1764-3.3 = ADJ FOR LT1764 *PIN 5 = SENSE FOR LT1764-1.5/LT1764-1.8/ LT1764-2.5/LT1764-3.3 = ADJ FOR LT1764 TJMAX = 150°C, θJA = 50°C/ W Q PACKAGE 5-LEAD PLASTIC DD TAB IS GND FRONT VIEW SENSE/ADJ* OUT GND IN SHDN T PACKAGE 5-LEAD PLASTIC TO-220 SENSE/ ADJ* OUT GND IN SHDN FRONT VIEW TAB IS GND LT1764EFE LT1764EFE-1.5 LT1764EFE-1.8 LT1764EFE-2.5 LT1764EFE-3.3 ORDER PART NUMBER FE PACKAGE 16-LEAD PLASTIC TSSOP EXPOSED PAD (PIN 17) IS GND. MUST BE SOLDERED TO THE PCB. TOP VIEW GND NC OUT OUT OUT SENSE/ADJ* GND GND GND NC IN IN IN NC SHDN GND TJMAX = 150°C, θJA = 38°C/ W *PIN 6 = SENSE FOR LT1764-1.5/ LT1764-3.3 = ADJ FOR LT1764 1764EFE 1764EFE15 1764EFE18 1764EFE25 1764EFE33 FE PART MARKING
PARAMETER CONDITIONS MIN TYP MAX UNITS Minimum Input Voltage I LOAD = 0.5A 1.7 V (Notes 3, 11) I LOAD = 1.5A 1.9 V ILOAD = 2.7A, 110°C < TJ ≤ 125°C 2.3 2.7 V ILOAD = 3A, –40 °C ≤ TJ ≤ 110°C 2.3 2.7 V (Note 4) 2.7V < V IN < 20V, 1mA < ILOAD < 3A, –40 °C ≤ TJ ≤ 110°C 1.447 1.500 1.545 V 2.8V < VIN < 20V, 1mA < ILOAD < 3A, –40 °C ≤ TJ ≤ 110°C 1.737 1.800 1.854 V LT1764-2.5 V IN = 3V, ILOAD = 1mA 2.462 2.500 2.538 V 3.5V < VIN < 20V, 1mA < ILOAD < 3A, –40 °C ≤ TJ ≤ 110°C 2.412 2.500 2.575 V 4.3V < VIN < 20V, 1mA < ILOAD < 3A, –40 °C ≤ TJ ≤ 110°C 3.183 3.300 3.400 V ADJ Pin Voltage LT1764 V IN = 2.21V, ILOAD = 1mA 1.192 1.210 1.228 V (Notes 3, 4) 2.7V < V IN < 20V, 1mA < ILOAD < 3A, –40 °C ≤ TJ ≤ 110°C 1.168 1.210 1.246 V Line Regulation LT1764-1.5 ∆VIN = 2.21V to 20V, ILOAD = 1mA ● 2.5 10 mV LT1764-1.8 ∆VIN = 2.3V to 20V, ILOAD = 1mA ● 31 0 m V LT1764-2.5 ∆VIN = 3V to 20V, ILOAD = 1mA ● 41 0 m V LT1764-3.3 ∆VIN = 3.8V to 20V, ILOAD = 1mA ● 4.5 10 mV LT1764 (Note 3) ∆VIN = 2.21V to 20V, ILOAD = 1mA ● 21 0 m V Load Regulation LT1764-1.5 V IN = 2.7V, ∆ILOAD = 1mA to 3A 3 7 mV VIN = 2.7V, ∆ILOAD = 1mA to 3A, –40 °C ≤ TJ ≤ 110°C2 3 m V VIN = 2.7V, ∆ILOAD = 1mA to 2.7A, 110°C < TJ ≤ 125°C2 3 m V LT1764-1.8 V IN = 2.8V, ∆ILOAD = 1mA to 3A 4 8 mV VIN = 2.8V, ∆ILOAD = 1mA to 3A, –40 °C ≤ TJ ≤ 110°C2 5 m V VIN = 2.8V, ∆ILOAD = 1mA to 2.7A, 110°C < TJ ≤ 125°C2 5 m V LT1764-2.5 V IN = 3.5V, ∆ILOAD = 1mA to 3A 4 10 mV VIN = 3.5V, ∆ILOAD = 1mA to 3A, –40 °C ≤ TJ ≤ 110°C3 0 m V VIN = 3.5V, ∆ILOAD = 1mA to 2.7A, 110°C < TJ ≤ 125°C3 0 m V LT1764-3.3 V IN = 4.3V, ∆ILOAD = 1mA to 3A 4 12 mV VIN = 4.3V, ∆ILOAD = 1mA to 3A, –40 °C ≤ TJ ≤ 110°C4 0 m V VIN = 4.3V, ∆ILOAD = 1mA to 2.7A, 110°C < TJ ≤ 125°C4 0 m V LT1764 (Note 3) V IN = 2.7V, ∆ILOAD = 1mA to 3A 2 5 mV VIN = 2.7V, ∆ILOAD = 1mA to 3A, –40 °C ≤ TJ ≤ 110°C2 0 m V VIN = 2.7V, ∆ILOAD = 1mA to 2.7A, 110°C < TJ ≤ 125°C2 0 m V Dropout Voltage I LOAD = 1mA 0.02 0.05 V VIN = VOUT(NOMINAL) ILOAD = 1mA ● 0.10 V (Notes 5, 6, 11) I LOAD = 100mA 0.07 0.13 V ILOAD = 100mA ● 0.18 V ILOAD = 500mA 0.14 0.20 V ILOAD = 500mA ● 0.27 V ILOAD = 1.5A 0.25 0.33 V ILOAD = 1.5A ● 0.40 V ILOAD = 2.7A, 110°C < TJ ≤ 125°C 0.66 V ILOAD = 3A 0.34 0.45 V ILOAD = 3A, –40 °C ≤ TJ ≤ 110°C 0.66 V
ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C. (Note 2)
GND Pin Current I LOAD = 0mA ● 1 1.5 mA VIN = VOUT(NOMINAL) + 1V I LOAD = 1mA ● 1.1 1.6 mA (Notes 5, 7) I LOAD = 100mA ● 3.5 5 mA ILOAD = 500mA ● 11 18 mA ILOAD = 1.5A ● 40 75 mA ILOAD = 2.7A, 110°C < TJ ≤ 125°C 120 200 mA ILOAD = 3A, –40 °C ≤ TJ ≤ 110°C 120 200 mA Output Voltage Noise C OUT = 10µF, ILOAD = 3A, BW = 10Hz to 100kHz 40 µVRMS ADJ Pin Bias Current (Notes 3, 8) 31 0 µA Shutdown Threshold V OUT = Off to On ● 0.9 2 V VOUT = On to Off ● 0.25 0.75 V SHDN Pin Current V SHDN = 0V 0.01 1 µA (Note 9) V SHDN = 20V 7 30 µA Quiescent Current in Shutdown V IN = 6V, VSHDN = 0V 0.01 1 µA Ripple Rejection V IN – VOUT = 1.5V (Avg), VRIPPLE = 0.5VP-P,5 5 6 3 d B fRIPPLE = 120Hz, ILOAD = 1.5A Current Limit V IN = 7V, VOUT = 0V 4 A LT1764-1.8, LT1764-2.5, LT1764-3.3 VIN = VOUT(NOMINAL) + 1V, ∆VOUT = –0.1V, – 40 °C ≤ TJ ≤ 110°C 3.1 A VIN = VOUT(NOMINAL) + 1V, ∆VOUT = –0.1V, 110 °C < TJ ≤ 125°C 2.8 A LT1764, LT1764-1.5 V IN = 2.7V, ∆VOUT = – 0.1V, –40 °C ≤ TJ ≤ 110°C 3.1 A VIN = 2.7V, ∆VOUT = – 0.1V, 110°C < TJ ≤ 125°C 2.8 A Input Reverse Leakage Current V IN = –20V, V OUT = 0V ● 1m A Reverse Output Current (Note 10) LT1764-1.5 V OUT = 1.5V, VIN < 1.5V 600 1200 µA LT1764-1.8 V OUT = 1.8V, VIN < 1.8V 600 1200 µA LT1764-2.5 V OUT = 2.5V, VIN < 2.5V 600 1200 µA LT1764-3.3 V OUT = 3.3V, VIN < 3.3V 600 1200 µA LT1764 (Note 3) V OUT = 1.21V, VIN < 1.21V 300 600 µA 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 LT1764 regulators are tested and specified under pulse load conditions such that TJ ≈ TA. The LT1764 is 100% tested at TA = 25°C. Performance at –40 °C and 125°C is assured by design, characterization and correlation with statistical process controls. Note 3: The LT1764 (adjustable version) is tested and specified for these conditions with the ADJ pin connected to the OUT pin. Note 4. Operating conditions are limited by maximum junction temperature. The regulated output voltage specification will not apply for all possible combinations of input voltage and output current. When operating at maximum input voltage, the output current range must be limited. When operating at maximum output current, the input voltage range must be limited. Note 5: To satisfy requirements for minimum input voltage, the LT1764 (adjustable version) is tested and specified for these conditions with an external resistor divider (two 4.12k resistors) for an output voltage of 2.42V. The external resistor divider will add a 300µA DC load on the output. Note 6: Dropout voltage is the minimum input to output voltage differential needed to maintain regulation at a specified output current. In dropout, the output voltage will be equal to: V IN – VDROPOUT. Note 7: GND pin current is tested with VIN = VOUT(NOMINAL) + 1V or VIN = 2.7V (whichever is greater) and a current source load. The GND pin current will decrease at higher input voltages. Note 8: ADJ pin bias current flows into the ADJ pin. Note 9: SHDN pin current flows into the SHDN pin. Note 10: Reverse output current is tested with the IN pin grounded and the OUT pin forced to the rated output voltage. This current flows into the OUT pin and out the GND pin. Note 11. For the LT1764, LT1764-1.5 and LT1764-1.8 dropout voltage will be limited by the minimum input voltage specification under some output voltage/load conditions. Note 12. All combinations of absolute maximum input voltage and absolute maximum output voltage cannot be achieved. The absolute maximum differential from input to output is ± 20V. For example, with VIN = 20V, VOUT cannot be pulled below ground. PARAMETER CONDITIONS MIN TYP MAX UNITS The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C. (Note 2)
TEMPERATURE (°C) –50 0.8 1.0 1.4 25 75
1764 G04
0.6 0.4 –25 0 50 100 125 0.2 1.2 QUIESCENT CURRENT (mA) LT1764-1.8/2.5/3.3 LT1764 VIN = 6V RL = ∞ IL = 0 VSHDN = VIN TEMPERATURE (°C) –5 0 OUTPUT VOLTAGE (V)
1756 G05
–2 5 0 5 0 1.84 1.83 1.82 1.81 1.80 1.79 1.78 1.77 1.76 75 100 125 IL = 1mA TEMPERATURE (°C) –5 0 OUTPUT VOLTAGE (V)
1756 G06
–2 5 0 5 0 2.58 2.56 2.54 2.52 2.50 2.48 2.46 2.44 2.42 75 100 125 IL = 1mA OUTPUT CURRENT (A) DROPOUT VOLTAGE (mV) 100 200 300 400 600 0.5 1.0 1.5 2.0
1764 G01
2.5 3.0 500 TJ = 125°C TJ = 25°C OUTPUT CURRENT (A) 700 600 500 400 300 200 100 1.5 2.5
1764 G02
0.5 1.0 2.0 3.0 GUARANTEED DROPOUT VOLTAGE (mV) = TEST POINTS TJ ≤ 125°C TJ ≤ 25°C TEMPERATURE (°C) –50 DROPOUT VOLTAGE (mV) 400 500 600 25 75
1764 G03
–25 0 50 100 125 100 IL = 3A IL = 1.5A IL = 0.5A IL = 100mA IL = 1mA TYPICAL PERFOR A CE CHARACTERISTICS UW Quiescent Current LT1764-1.8 Output Voltage LT1764-2.5 Output Voltage LT1764-3.3 Output Voltage LT1764 ADJ Pin Voltage LT1764-1.8 Quiescent Current TEMPERATURE (°C) –5 0 OUTPUT VOLTAGE (V)
1756 G07
–2 5 0 5 0 3.38 3.36 3.34 3.32 3.30 3.28 3.26 3.24 3.22 75 100 125 IL = 1mA TEMPERATURE (°C) –5 0 ADJ PIN VOLTAGE (V)
1756 G08
–2 5 0 5 0 1.230 1.225 1.220 1.215 1.210 1.205 1.200 1.195 1.190 75 100 125 IL = 1mA INPUT VOLTAGE (V) QUIESCENT CURRENT (mA)
1764 G09
TJ = 25°C RL = ∞ VSHDN = VIN Typical Dropout Voltage Guaranteed Dropout Voltage Dropout Voltage
INPUT VOLTAGE (V) GND PIN CURRENT (mA)
1764 G16
RL = 2.42Ω IL = 500mA* RL = 12.1Ω IL = 100mA* RL = 4.33Ω IL = 300mA* TJ = 25°C VSHDN = VIN *FOR VOUT = 1.21V INPUT VOLTAGE (V) GND PIN CURRENT (mA) 120 150
1764 G17
RL = 0.6Ω IL = 3A* RL = 2.57Ω IL = 0.7A* RL = 1.2Ω IL = 1.5A* TJ = 25°C VSHDN = VIN *FOR VOUT = 1.8V INPUT VOLTAGE (V) GND PIN CURRENT (mA) 120 160 200
1764 G18
RL = 0.83Ω IL = 3A* RL = 3.57Ω IL = 0.7A*RL = 1.66Ω IL = 1.5A* TJ = 25°C VSHDN = VIN *FOR VOUT = 2.5V TYPICAL PERFOR A CE CHARACTERISTICS UW LT1764-1.8 GND Pin Current LT1764-2.5 GND Pin Current LT1764-3.3 GND Pin Current LT1764 GND Pin Current LT1764-1.8 GND Pin Current LT1764-2.5 GND Pin Current INPUT VOLTAGE (V) GND PIN CURRENT (mA) 20.0 17.5 15.0 12.5 10.0 7.5 5.0 2.5
1764 G13
TJ = 25°C VSHDN = VIN *FOR VOUT = 1.8V RL = 3.6Ω IL = 500mA* RL = 18Ω IL = 100mA* RL = 6Ω IL = 300mA* INPUT VOLTAGE (V) GND PIN CURRENT (mA)
1764 G14
TJ = 25°C VSHDN = VIN *FOR VOUT = 2.5V RL = 5Ω IL = 500mA* RL = 25Ω IL = 100mA* RL = 8.33Ω IL = 300mA* INPUT VOLTAGE (V) GND PIN CURRENT (mA)
1764 G15
TJ = 25°C VSHDN = VIN *FOR VOUT = 3.3V RL = 6.6Ω IL = 500mA* RL = 33Ω IL = 100mA* RL = 11Ω IL = 300mA* LT1764-2.5 Quiescent Current LT1764-3.3 Quiescent Current LT1764 Quiescent Current INPUT VOLTAGE (V) QUIESCENT CURRENT (mA)
1764 G10
TJ = 25°C RL = ∞ VSHDN = VIN INPUT VOLTAGE (V) QUIESCENT CURRENT (mA)
1764 G11
TJ = 25°C RL = ∞ VSHDN = VIN INPUT VOLTAGE (V) QUIESCENT CURRENT (mA) 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2
1764 G12
TJ = 25°C RL = 4.3k VSHDN = VIN
TYPICAL PERFOR A CE CHARACTERISTICS UW SHDN Pin Input Current ADJ Pin Bias Current Current Limit TEMPERATURE (°C) –50 SHDN PIN THRESHOLD (V) 0.1 0.3 0.4 0.5 1.0 0.7 0 50 75
1764 G22
0.2 0.8 0.9 0.6 –25 25 100 125 IL = 1mA TEMPERATURE (°C) –50 SHDN PIN THRESHOLD (V) 0.1 0.3 0.4 0.5 1.0 0.7 0 50 75
1764 G23
0.2 0.8 0.9 0.6 –25 25 100 125 IL = 3A IL = 1mA SHDN PIN VOLTAGE (V) SHDN PIN INPUT CURRENT (µA)
1764 G24
TEMPERATURE (°C) –50 SHDN PIN INPUT CURRENT (µA) 0 50 75
1764 G25
–25 25 100 125 VSHDN = 20V TEMPERATURE (°C) –5 0 ADJ PIN BIAS CURRENT (µA)
1756 G26
–2 5 0 5 0 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 75 100 125 INPUT/OUTPUT DIFFERENTIAL (V) CURRENT LIMIT (A)2 4 8 12 16
1764 G27
TJ = –50 °C TJ = 125°C TJ = 25°C LT1764-3.3 GND Pin Current LT1764 GND Pin Current GND Pin Current vs I LOAD INPUT VOLTAGE (V) GND PIN CURRENT (mA) 120 160 200
1764 G19
RL = 1.1Ω IL = 3A* RL = 2.2Ω IL = 1.5A* TJ = 25°C VSHDN = VIN *FOR VOUT = 3.3V RL = 4.71Ω IL = 0.7A* INPUT VOLTAGE (V) GND PIN CURRENT (mA) 120 150
1764 G20
RL = 0.4Ω IL = 3A* RL = 0.81Ω IL = 1.5A* TJ = 25°C VSHDN = VIN *FOR VOUT = 1.21V RL = 1.73Ω IL = 0.7A* OUTPUT CURRENT (A) GND PIN CURRENT (mA) 100 1.5 2.5
1764 G21
0.5 1.0 2.0 120 140 160 3.0 VIN = VOUT(NOM) + 1V SHDN Pin Threshold (Off-to-On) SHDN Pin Input Current SHDN Pin Threshold (On-to-Off)
TYPICAL PERFOR A CE CHARACTERISTICS UW Ripple Rejection Ripple Rejection LT1764 Minimum Input Voltage FREQUENCY (Hz) RIPPLE REJECTION (dB) 10 1k 10k 1M
1764 G31
COUT = 100µF TANTALUM + 10 × 1µF CERAMIC COUT = 10µF TANTALUMIL = 1.5A VIN = VOUT(NOM) + 1V + 50mVRMS RIPPLE TEMPERATURE (°C) –50 –25 RIPPLE REJECTION (dB) 0 50 75
1764 G32
IL = 1.5A VIN = VOUT(NOM) + 1V + 0.5VP-P RIPPLE AT f = 120Hz TEMPERATURE (°C) –50 MINIMUM INPUT VOLTAGE (V) 2.0 2.5 3.0 25 75
1764 G33
1.5 1.0 –25 0 50 100 125 0.5 IL = 3A IL = 1.5A IL = 100mA IL = 500mA Current Limit Reverse Output Current Reverse Output Current TEMPERATURE (°C) –50 CURRENT LIMIT (A) 25 75
1764 G28
–25 0 50 100 125 VIN = 7V VOUT = 0V OUTPUT VOLTAGE (V) REVERSE OUTPUT CURRENT (mA) 3.0 4.0 5.0
1764 G29
2.0 1.0 2.5 3.5 4.5 1.5 0.5 2 4 619 3 5 7 10 TJ = 25°C VIN = 0V CURRENT FLOWS INTO OUTPUT PIN VOUT = VADJ (LT1764) VOUT = VFB LT1764 LT1764-1.8 LT1764-2.5 LT1764-3.3 TEMPERATURE (°C) –50 REVERSE OUTPUT CURRENT (mA) 0.1 0.3 0.4 0.5 1.0 0.7 0 50 75
1764 G30
0.2 0.8 0.9 0.6 –25 25 100 125 VIN = 0V VOUT = 1.21V (LT1764) VOUT = 1.8V (LT1764-1.8) VOUT = 2.5V (LT1764-2.5) VOUT = 3.3V (LT1764-3.3) LT1764
LT1764-3.3 10Hz to 100kHz Output Noise LT1764-3.3 Transient Response TEMPERATURE (°C) –5 0 LOAD REGULATION (mV)
1764 G34
–2 5 0 5 0 –10 –15 –20 –25 –30 75 100 125 LT1764 LT1764-3.3 LT1764-2.5 LT1764-1.8 ∆IL = 1mA TO 3A VIN = 2.7V (LT1764) VIN = VOUT(NOM) + 1V FREQUENCY (Hz) 0.01OUTPUT NOISE SPECTRAL DENSITY (µV/√Hz) 0.1 100 1k 10k 100k
1764 G35
LT1764-3.3 LT1764-2.5 LT1764-1.8LT1764 COUT = 10µF ILOAD = 3A LOAD CURRENT (A) OUTPUT NOISE (µVRMS) 0.0001 0.01 0.1 10
1764 G36
0.001 1 LT1764-3.3 LT1764-2.5 LT1764-1.8 LT1764 COUT = 10µF VOUT 100µV/ DIV COUT = 10µF 1ms/DIV 1764 G37 IL = 3A TIME (µs) OUTPUT VOLTAGE DEVIATION (V)LOAD CURRENT (A) –0.1 0.1 –0.2 0.2
1764 G38
1.00 0.50 0.75 0.25 462 8 12 14 1810 20 VIN = 4.3V CIN = 3.3µF TANTALUM COUT = 10µF TANTALUM LT1764-3.3 Transient Response TIME (µs) OUTPUT VOLTAGE DEVIATION (V)LOAD CURRENT (A) –0.1 0.1 –0.2 0.2
1764 G39
VIN = 4.3V CIN = 33µF COUT = 100µF TANTALUM + 10 × 1µF CERAMIC TYPICAL PERFOR A CE CHARACTERISTICS UW Load Regulation Output Noise Spectral Density RMS Output Noise vs Load Current (10Hz to 100kHz)
pacitance and reverse output characteristics. P) of PC traces between the regulator and the load. allow the device to start and operate. ground and the output voltage range is 1.21V to 20V. power shutdown state if the SHDN pin is not connected. device will act as if there is a diode in series with its input. protect both itself and the load. PCB for rated thermal performance. Figure 1. Kelvin Sense Connection
1764 F01
and still allow the device to start and operate. current, 3µA at 25°C, flows through R2 into the ADJ pin. Figure 2. The value of R1 should be less than 4.17k to off and the divider current will be zero. pin tied to the OUT pin for an output voltage of 1.21V. Figure 2. Adjustable Operation temperature coefficients as shown in Figures 3 and 4. capacitance at operating voltage should be verified.
1764 F02
Figure 4. Ceramic Capacitor Temperature Characteristics to zero and brought up again to make the output recover. the LT1764 increasing to 37µVRMS for the LT1764-3.3.
1764 F04
1210 CASE SIZE, 10µF
Figure 3. Ceramic Capacitor DC Bias Characteristics
1764 F03
induced by vibrations in the system or thermal transients. operating region for all values of input-to-output voltage.
by the maximum rated junction temperature (125 °C).
- Output current multiplied by the input/output voltage
- GND pin current multiplied by the input voltage:
all sources of thermal resistance from junction to ambient. Table 1. Q Package, 5-Lead DD Table 2. FE Package, 16-Lead TSSOP
and reverse voltages from output to input. tion, the junction temperature should not exceed 125°C. the output from sourcing the short-circuit current. from the 1.21V reference when the output is forced to 20V. yields a minimum top resistor value of 2.6k. the curve shown in Figure 5. current when the output is pulled above the input. Figure 5. Reverse Output Current
1764 F05
LT1006– C1B 1/2 LT1018 C1A 1/2 LT1018 LT1004 1.2V
1764 TA03
1µF 1N4148 1N4148 10k 10k 750Ω 750Ω 2.4k 22µF 1N4002 TO ALL “V+” POINTS 200k 34k* 12.1k* 0.1µF 10k 0.033µF 10000µF 22µF VOUT 3.3V 1N4002 1N4002 10V AC AT 115V IN 1N4148 500µH 90V AC TO 140V AC 10V AC AT 115V IN LT1764-3.3 GND IN SHDN OUT FB L1: COILTRONICS CTX500-2-52 L2: STANCOR P-8560 *1% FILM RESISTOR NTE5437 NTE5437 “SYNC” SCR Preregulator Provides Efficiency Over Line Variations
LT1764-1.8 GND IN SHDN 100k OUT FB 470Ω
1764 TA04
3.3µF 1µF 10µFV IN > 2.7V LT1004-1.2 0.01Ω 40.2k 2.2k 2.2k LOAD 1/2 LT1366 ADJUST R1 FOR 0A TO 3A CONSTANT CURRENT
(LTC DWG # 05-08-1461) Q(DD5) 0502 .028 – .038 (0.711 – 0.965) TYP .143 +.012 –.020 ()3.632+0.305 –0.508 .067 (1.702) BSC .013 – .023 (0.330 – 0.584) .095 – .115 (2.413 – 2.921) .004 +.008 –.004 ()0.102 +0.203 –0.102 .050 ± .012 (1.270 ± 0.305) .059 (1.499) TYP .045 – .055 (1.143 – 1.397) .165 – .180 (4.191 – 4.572) .330 – .370 (8.382 – 9.398) .060 (1.524) TYP .390 – .415 (9.906 – 10.541) 15° TYP .420 .350 .565 .090 .042.067 RECOMMENDED SOLDER PAD LAYOUT .325 .205 .080 .565 .090 RECOMMENDED SOLDER PAD LAYOUT FOR THICKER SOLDER PASTE APPLICATIONS .042.067 .420 .276 .320 NOTE: 1. DIMENSIONS IN INCH/(MILLIMETER) 2. DRAWING NOT TO SCALE .300 (7.620) .075 (1.905) .183 (4.648) .060 (1.524) .060 (1.524) .256 (6.502) BOTTOM VIEW OF DD PAK HATCHED AREA IS SOLDER PLATED COPPER HEAT SINK
T5 (TO-220) 0399 0.028 – 0.038 (0.711 – 0.965) 0.067 (3.429 – 4.191) 0.700 – 0.728 (17.78 – 18.491) 0.045 – 0.055 (1.143 – 1.397) 0.095 – 0.115 (2.413 – 2.921) 0.013 – 0.023 (0.330 – 0.584) 0.620 (15.75) TYP 0.155 – 0.195* (3.937 – 4.953) 0.152 – 0.202 (6.60 – 8.13) 0.165 – 0.180 (4.191 – 4.572) 0.147 – 0.155 (3.734 – 3.937) DIA 0.390 – 0.415 (9.906 – 10.541) 0.330 – 0.370 (8.382 – 9.398) 0.460 – 0.500 (11.684 – 12.700) 0.570 – 0.620 (14.478 – 15.748) 0.230 – 0.270 (5.842 – 6.858) BSC SEATING PLANE * MEASURED AT THE SEATING PLANE T Package 5-Lead Plastic TO-220 (Standard) (LTC DWG # 05-08-1421)
16-Lead Plastic TSSOP (4.4mm) (Reference LTC DWG # 05-08-1663) Exposed Pad Variation BB Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. PACKAGE DESCRIPTIONU FE16 (BB) TSSOP 0204 0.09 – 0.20 (.0035 – .0079) 0° – 8° 0.25 REF 0.50 – 0.75 (.020 – .030) 4.30 – 4.50* (.169 – .177) 13 4 5 6 7 8 10 9 4.90 – 5.10* (.193 – .201) 16 1514 13 12 11 1.10 (.0433) MAX 0.05 – 0.15 (.002 – .006) 0.65 (.0256) BSC 2.94 (.116) 0.195 – 0.30 (.0077 – .0118) TYP 2RECOMMENDED SOLDER PAD LAYOUT 0.45 ±0.05
0.65 BSC
4.50 ±0.10 6.60 ±0.10 1.05 ±0.10 2.94 (.116) 3.58 (.141) 3.58 (.141) MILLIMETERS (INCHES) *DIMENSIONS DO NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.150mm (.006") PER SIDE NOTE: 1. CONTROLLING DIMENSION: MILLIMETERS 2. DIMENSIONS ARE IN 3. DRAWING NOT TO SCALE SEE NOTE 4 4. RECOMMENDED MINIMUM PCB METAL SIZE FOR EXPOSED PAD ATTACHMENT 6.40 (.252) BSC
LT 1205 REV B • PRINTED IN USA © LINEAR TECHNOLOGY CORPORATION 2005 Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LT1120 125mA Low Dropout Regulator with 20 µA IQ Includes 2.5V Reference and Comparator LT1121 150mA Micropower Low Dropout Regulator 30 µA IQ, SOT-223 Package LT1129 700mA Micropower Low Dropout Regulator 50 µA Quiescent Current LT1175 500mA Negative Low Dropout Micropower Regulator 45 µA IQ, 0.26V Dropout Voltage, SOT-223 Package LT1374 4.5A, 500kHz Step-Down Converter 4.5A, 0.07 Ω Internal Switch, SO-8 Package LT1521 300mA Low Dropout Micropower Regulator with Shutdown 15 µA IQ, Reverse Battery Protection LT1529 3A Low Dropout Regulator with 50 µA IQ 500mV Dropout Voltage LT1573 UltraFast TM Transient Response Low Dropout Regulator Drives External PNP LT1575 UltraFast Transient Response Low Dropout Regulator Drives External N-Channel MOSFET LT1735 Synchronous Step-Down Converter High Efficiency, OPTI-LOOP Compensation LT1761 Series 100mA, Low Noise, Low Dropout Micropower Regulators in SOT-23 20 µA Quiescent Current, 20µVRMS Noise, SOT-23 Package LT1762 Series 150mA, Low Noise, LDO Micropower Regulators 25 µA Quiescent Current, 20µVRMS Noise, MSOP Package LT1763 Series 500mA, Low Noise, LDO Micropower Regulators 30 µA Quiescent Current, 20µVRMS Noise, SO-8 Package LT1962 300mA, Low Noise, LDO Micropower Regulator 20 µVRMS Noise, MSOP Package LT1963 1.5A, Low Noise, Fast Transient Response LDO 40 µVRMS Noise, SOT-223 Package UltraFast is a trademark of Linear Technology Corporation. OPTI-LOOP is a registered trademark of Linear Technology Corporation. TYPICAL APPLICATIO U Paralleling of Regulators for Higher Output Current LT1764-3.3 GND IN SHDN OUT FB LT1764 GND IN 6.65k 22µF 3.3V SHDN OUT ADJSHDN 4.12k 0.01µF 2.2k 0.01Ω 2.2k
1764 TA05
+C1 100µF 1/2 LT1366 0.01Ω VIN > 3.7V