LT1317 LINER [Linear Technology], LT1317 Datasheet
LT1317
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LT1317 Summary of contents
Page 1
... The LT1317/LT1317B contain an internal low-battery de- tector with a 200mV reference that stays alive when the device goes into shutdown. No-load quiescent current of the LT1317 is 100 A and shuts down The internal NPN power switch handles a 500mA current with a voltage drop of just 300mV. ...
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... SHDN (LT1317/LT1317B) SHDN V = 2V, Switching (LT1317B) SHDN V = 2V, Switching (LT1317B) SHDN 2.5V, Duty Cycle = 30 2.5V, Duty Cycle = 30% IN Duty Cycle = 30% (LT1317) ORDER PART TOP VIEW NUMBER 8 LBO LT1317CS8 7 LBI LT1317BCS8 LT1317IS8 SW 5 LT1317BIS8 S8 PACKAGE S8 PART MARKING ...
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... LBI 1M Load 500mA SW 1.8V V 12V unless otherwise noted. A CONDITIONS Not Switching (LT1317) SHDN (LT1317/LT1317B) SHDN V = 2V, Switching (LT1317B) SHDN 2.5V, Duty Cycle = 30 SHDN SHDN SINK V = 250mV LBI LBO V = 150mV ...
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... DUTY CYCLE (%) 1317 TPC04 Feedback Voltage 1.25 1.24 1.23 1.22 1.21 1.20 –50 – 100 TEMPERATURE ( C) 1317 TPC07 4 Burst Mode Current Limit (LT1317) 800 600 400 200 DUTY CYCLE (%) LBI Input Bias Current 100 – ...
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... SHDN PIN VOLTAGE (V) 1317 TPC11 2-Cell to 5V Converter Efficiency (LT1317B 1000 1 LOAD CURRENT (mA) 1317 TPC14 Burst Mode Operation (LT1317) V OUT 50mV/DIV AC COUPLED I L 200mA/DIV V SW 5V/DIV s/DIV 1317 TPC17 3.3V OUT I = 30mA LOAD ...
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... LBI (Pin 7): Low-Battery Detector Input. 200mV refer- ence. Voltage on LBI must stay between ground and 700mV. Low-battery detector remains active in shutdown mode. LBO (Pin 8): Low-Battery Detector Output. Open collec- tor, can sink pull-up is recommended. Load Regulation (LT1317) V OUT 50mV/DIV DC COUPLED OFFSET ...
Page 7
... If the load is light, the output voltage (and FB voltage) will increase until A1’s output goes low, turning off the rest of the LT1317. Low frequency ripple voltage appears at the output. The ripple frequency is dependent on load current and output capacitance. This ...
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... APPLICATIONS INFORMATION The LT1317B differs from the LT1317 in that the bias point set lower than on the LT1317 so that minimum switch current can drop below 50mA. Because A1’s bias point is set lower, there is no Burst Mode operation at light loads and the device continues switching at constant frequency ...
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... Coiltronics Capacitor Selection Low ESR (Equivalent Series Resistance) capacitors should be used at the output of the LT1317. For most applications a solid tantalum case size works well. Accept- able capacitance values range from 330 F with ESR falling between 0.1 and 0 component size is ...
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... which optimum R and C values giving the best possible settling time with adequate phase margin. An additional 100pF capacitor (C pin and is necessary if the LT1317 is operated near current limit. Also, C capacitors are used. V OUT 100mV/DIV AC COUPLED I LOAD 2mA TO 200mA 1317 F07 ...
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... U APPLICATIONS INFORMATION LOW-BATTERY DETECTOR The LT1317’s low-battery detector is a simple PNP input gain stage with an open collector NPN output. The nega- tive input of the gain stage is tied internally to a 200mV 5% reference. The positive input is the LBI pin. Arrange- ment as a low-battery detector is straightforward. ...
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... OUT 5V 1M 250mA 324k 1% 1317 TA05 Low Profile 3 Converter 3. LT1317BCMS8 15 F SHDN 10V V GND C 33k 332k 3.3nF C1: AVX TAJA156M010 C2: MURATA GRM235Y5V106Z01 L1: MURATA LQH3C100 OR SUMIDA CLQ61-100N D1: MOTOROLA MBR0520LT1 5V to 12V Boost Converter Efficiency ...
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... L1: COILTRONICS CTX20-1 Q1: 2N3904 2 Li-Ion to 8.2V DC/DC Converter 16V 22pF LT1317/LT1317B FB SHUTDOWN SHDN V GND C 33k 100pF 3.3nF D1: MOTOROLA MBR0520LT1 L1: SUMIDA CD43-220 LT1317/LT1317B D1 5V 130mA 33k 332k 100 F 1% 10V 3.3nF 1317 TA07 D1 V OUT 4.1V 110mA 10V 432k ...
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... MURATA GRM235Y5V107Z01 C2: AVX TAJB336M010 C3: AVX TAJA156M010 MBR0520 BAT54S (DUAL DIODE) MURATA LQH3C220K04 Low Noise 33V Varactor Bias Supply D3 150pF 680 0 150k IN FB LT1317B V GND C C4 0.1 F 33k 5.9k 3300pF – 4V 10mA 70mA + 1317 TA02 ...
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... DWG # 05-08-1610) (4.801 – 5.004) 8 0.228 – 0.244 (5.791 – 6.197 0.053 – 0.069 (1.346 – 1.752) 0 – 8 TYP 0.014 – 0.019 (0.355 – 0.483) LT1317/LT1317B 0.118 0.004** (3.00 0.102 0.034 0.004 (0.86 0.102) 0.006 0.004 (0.15 0.102) ...
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... H PRI 10V 16V LT1317 1M SHDN FB V GND C 10k 604k 3300pF D1, D2: MBR0520LT1 (MOTOROLA) OR EQUIVALENT D3: MMBD914LT1 (MOTOROLA) OR EQUIVALENT T1: COILTRONICS CTX02-14272-X1 COMMENTS 1.8V Minimum Input, Drives N-Channel MOSFETs 94% Efficiency, 130 A I 5V/600mA from 2V, 2A Internal Switch, 200 A I Low-Battery Detector Active in Shutdown 3 ...