lt1317b Linear Technology Corporation, lt1317b Datasheet
lt1317b
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lt1317b Summary of contents
Page 1
... Burst Mode operation is kept below 250mA for most operating conditions which results in low output ripple voltage, even at high input voltages. The LT1317B does not shift into Burst Mode operation at light loads, eliminat- ing low frequency output ripple at the expense of light load efficiency ...
Page 2
... LTHA LTHB = 25 C, unless otherwise noted. A CONDITIONS Not Switching (LT1317) 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 ...
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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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... LT1317/LT1317B W U TYPICAL PERFOR A CE CHARACTERISTICS Oscillator Frequency 700 –40 C 650 600 550 500 INPUT VOLTAGE 1317 TPC01 Switch Current Limit 1200 1000 TYPICAL 800 600 MINIMUM (25 C) 400 200 DUTY CYCLE (%) 1317 TPC04 Feedback Voltage 1 ...
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... TEMPERATURE ( C) 2-Cell to 3.3V Converter Efficiency (LT1317B 1.65V 2. 100 LOAD CURRENT (mA) Transient Response (LT1317B) V OUT 100mV/DIV AC COUPLED I L 200mA/DIV 165mA I LOAD 5mA 1ms/DIV 3.3V OUT CIRCUIT OF FIGURE 1 WITH LT1317B LT1317/LT1317B SHDN Pin Current – ...
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... LT1317/LT1317B W U TYPICAL PERFOR A CE CHARACTERISTICS Load Regulation (LT1317) V OUT 50mV/DIV DC COUPLED OFFSET ADDED V = 1.5V I 25mA/DIV IN LOAD 1317 TPC19 OUT Load Regulation (LT1317) V OUT 50mV/DIV DC COUPLED OFFSET ADDED V = 1.5V I 25mA/DIV 1317 TPC22 IN LOAD V = 3.3V OUT Note: For load regulation pictures, double lines are due to output capacitor ESR ...
Page 7
... LBI pin voltage drops below 200mV. There is no hysteresis in A4, allowing used as an amplifier in some applications. The low-battery detector remains active in shutdown. To enable the converter, SHDN must be left floating or tied to a voltage between 1.4V and 6V. LT1317/LT1317B LBI + 7 LBO 8 – ...
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... U U 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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... D1 V OUT 3. 200mV/DIV COUPLED 10 F CERAMIC R2 604k 1% I LOAD 5mA TO 200mA 1317 F04 Figure 5. Transient Response for the Circuit of Figure 4. LT1317/LT1317B and C . Figure 5 details transient C C pin (<5mm ceramic case IN OUT 200 s/DIV 1317 F05 9 ...
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... LT1317/LT1317B U U APPLICATIONS INFORMATION FREQUENCY COMPENSATION The LT1317 has an external compensation pin (V allows the frequency response to be optimized for the circuit configuration. In most cases, the values used in Figure 1 will work. Some circuits may need additional compensation and a simple trial and error method for determining the necessary component values is given ...
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... Figure 12. The low-battery detector remains active in shutdown. 3. PROCESSOR V – 200mV MBR0520 V OUT 3.3V 1M 250mA 1% L1B 604k 1% 1317 TA03 LT1317/LT1317B 200k V IN 2N3906 LBO LT1317 V REF LBI + 200mV GND 10k 10 F 1317 F12 Figure 12. Accessing 200mV Reference 3.3V SEPIC Efficiency ...
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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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... LT1317/LT1317B U TYPICAL APPLICATION 4 AA CELLS (3.2V TO 6.5V) SHUTDOWN C1, C4: AVX TPSC226M016 C2: AVX TPSC106M006 C3: CERAMIC (i.e. AVX, MANY OTHERS) C5: SANYO 35CV10GX RELATED PARTS PART NUMBER DESCRIPTION ® LTC 1163 Triple High Side Driver for 2-Cell Inputs LTC1174 Micropower Step-Down DC/DC Converter LT1302 High Output Current Micropower DC/DC Converter ...