LT1117-3.3 Linear Technology, LT1117-3.3 Datasheet

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LT1117-3.3

Manufacturer Part Number
LT1117-3.3
Description
800mA Low Dropout Positive Regulators Adjustable and Fixed 2.85V/ 3.3V/ 5V
Manufacturer
Linear Technology
Datasheet

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Part Number
Manufacturer
Quantity
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Part Number:
LT1117-3.3TR
Manufacturer:
LT/凌特
Quantity:
20 000
FEATURE
A
TYPICAL
PPLICATI
Space Saving SOT-223 Surface Mount Package
Three-Terminal Adjustable or Fixed 2.85V, 3.3V, 5V
Output Current of 800mA
Operates Down to 1V Dropout
Guaranteed Dropout Voltage at Multiple Current Levels
0.2% Line Regulation Max
0.4% Load Regulation Max
Active SCSI Terminators
High Efficiency Linear Regulators
Post Regulators for Switching Supplies
Battery Chargers
5V to 3.3V Linear Regulators
4.75V TO
5.25V
A
S
Active Terminator for SCSI-2 Bus
+
O
PPLICATI
U
10 F
IN
S
LT1117-2.85
GND
OUT
O
U
+
22 F
110
110
110
110
LT1117 • TA01
18 TO 27
LINES
Adjustable and Fixed 2.85V,
D
The LT1117 is a positive low dropout regulator designed
to provide up to 800mA of output current. The device is
available in an adjustable version and fixed output voltages
of 2.85V, 3.3V and 5V. The 2.85V version is designed
specifically to be used in Active Terminators for the SCSI
bus. All internal circuitry is designed to operate down to 1V
input to output differential. Dropout voltage is guaranteed
at a maximum of 1.2V at 800mA, decreasing at lower load
currents. On chip trimming adjusts the reference/output
voltage to within
order to minimize the stress on both the regulator and the
power source circuitry under overload conditions.
The low profile surface mount SOT-223 package allows
the device to be used in applications where space is
limited. The LT1117 requires a minimum of 10 F of output
capacitance for stability. Output capacitors of this size or
larger are normally included in most regulator designs.
Unlike PNP type regulators where up to 10% of the output
current is wasted as quiescent current, the quiescent
current of the LT1117 flows into the load, increasing
efficiency.
ESCRIPTIO
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
800mA Low Dropout
0
Dropout Voltage (V
100
Positive Regulators
INDICATES GUARANTEED TEST POINT
U
1%. Current limit is also trimmed in
200 300
OUTPUT CURRENT (mA)
LT1117-3.3/LT1117-5
LT1117/LT1117-2.85
400
500
IN
T
T
J
J
– V
= 25 C
= 125 C
600
LT1117 • TPC01
OUT
700
3.3V, 5V
)
800
1

Related parts for LT1117-3.3

LT1117-3.3 Summary of contents

Page 1

... LT1117 flows into the load, increasing efficiency. 1.4 110 1.2 110 1.0 110 LINES 0.8 110 0 0.4 0.2 LT1117 • TA01 0 LT1117/LT1117-2.85 LT1117-3.3/LT1117-5 800mA Low Dropout Positive Regulators 3.3V 1%. Current limit is also trimmed in Dropout Voltage (V – OUT 125 C J INDICATES GUARANTEED TEST POINT 0 ...

Page 2

... LT1117/LT1117-2.85 LT1117-3.3/LT1117 BSOLUTE Input Voltage Operating Voltage LT1117, LT1117-3.3, LT1117-5 ...................... 15V LT1117-2.85 ................................................... 10V Surge Voltage LT1117, LT1117-3.3, LT1117-5 ...................... 20V U PACKAGE/ORDER I FOR ATIO FRONT VIEW 3 IN TAB IS 2 OUT V OUT 1 ADJ/GND ST PACKAGE 3-LEAD PLASTIC SOT-223 T = 125 C/W J MAX JC Consult factory for Industrial and Military grade parts ...

Page 3

... Note 3: Minimum load current is defined as the minimum output current required to maintain regulation HARA TERISTICS C Short-Circuit Current 1. 125 0.75 0.50 0. INPUT/OUTPUT DIFFERENTIAL (V) LT1117 • TPC03 LT1117/LT1117-2.85 LT1117-3.3/LT1117-5 MIN TYP MAX 0.01 0 120 0.2 5 0.5 0.3 0.003 15 Load Regulation 0.10 I ...

Page 4

... LT1117/LT1117-2.85 LT1117-3.3/LT1117 TYPICAL PERFOR A LT1117 Ripple Rejection 100 V RIPPLE P-P RIPPLE 0.5V P – OUT – OUT) DROPOUT 200 < 60Hz 20 ADJ > 60Hz ADJ 0.5A OUT 0 10 100 1k 10k 100k FREQUENCY (Hz) LT1117 • ...

Page 5

... The internal current paths on the LT1117 adjust pin are limited by internal resistors. Therefore, even with capacitors on the adjust pin, no protection diode is needed to ensure device safety under short circuit conditions. The LT1117/LT1117-2.85 LT1117-3.3/LT1117-5 LT1117 • BD01 5 ...

Page 6

... LT1117/LT1117-2.85 LT1117-3.3/LT1117 PPLICATI HI TS adjust pin can be driven transient basis, 25V with respect to the output without any device degradation. Diodes between input and output are not usually needed. The internal diode between the output and input pins of the device can withstand microsecond surge currents of 10A to 20A ...

Page 7

... It will increase by a factor of four. Ripple rejection will be degraded by 12dB from the value shown on the curve. THERMAL RESISTANCE (JUNCTION-TO-AMBIENT) 45 C/W 45 C/W 53 C/W 59 C/W 52 C/W 55 C/W LT1117/LT1117-2.85 LT1117-3.3/LT1117-5 – OUT OUT + P (Thermal Resistance (junction-to ...

Page 8

... LT1117/LT1117-2.85 LT1117-3.3/LT1117 TYPICAL A PPLICATI 1.2V to 10V Adjustable Regulator LT1117 V IN OUT IN R1 ADJ 121 + C1 NEEDED IF DEVICE IS FAR FROM FILTER CAPACITORS R2 † 1.25V 1 + — OUT RETURN Adjusting Output Voltage of Fixed Regulators LT1117-5 V > 12V IN OUT IN + GND ...

Page 9

... FEEDBACK PATH MUR410 3.3V OUTPUT (TYPICAL) + 470 F LT1117-5 MUR410 IN GND + 470 F IN LT1117-5 MUR410 IN SWITCHING REGULATOR GND + 470 F LT1117/LT1117-2.85 LT1117-3.3/LT1117-5 Battery Backed Up Regulated Supply LT1117-5 5.2V LINE IN OUT 5.0V BATTERY + GND SELECT FOR CHARGE RATE LT1117-5 IN OUT + + GND 10 F 100 F Automatic Light Control ...

Page 10

... LT1117/LT1117-2.85 LT1117-3.3/LT1117 TYPICAL A PPLICATI (HEAT SINK) Q1 2N6667 (DARLINGTON) + MDA201 + – 130VAC- STANCOR 90VAC P-8685 (HEAT SINK) 2N6667 (DARLINGTON) + MDA201 + – FILM RESISTORS * = MOTOROLA MDA = PULSE ENGINEERING, INC. #PE-92106 FLOATING INPUT 10 S High Efficiency Dual Linear Supply L1 285 H + MBR360 1000 F 2 ...

Page 11

... S High Efficiency Regulator LT1117 1mH IN + ADJ MR1122 10,000 F 470 28V 1N914 1M 4N28 10k + LT1011 10k – 28V 1N914 LT1117/LT1117-2.85 LT1117-3.3/LT1117-5 OUTPUT OUT 240 + 100 F 2k OUTPUT ADJUST LT1117 • TA15 LT1117 • TA18 11 ...

Page 12

... LT1117/LT1117-2.85 LT1117-3.3/LT1117-5 PACKAGE DESCRIPTIO 0.401 ± 0.015 0.060 (10.185 ± 0.381) (1.524) +0.012 0.331 –0.020 +0.305 8.407 –0.508 0.100 ± 0.010 +0.012 (2.5402 ± 0.254) 0.143 –0.020 0.050 ± 0.008 +0.305 3.632 (1.270 ± 0.203) –0.508 0.248 – ...

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