LTC3830-1ES8 Linear Technology, LTC3830-1ES8 Datasheet
LTC3830-1ES8
Specifications of LTC3830-1ES8
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LTC3830-1ES8 Summary of contents
Page 1
... In shutdown mode, the LTC3830 supply current drops to <10µA. The LTC3830-1 differs from the LTC3830 S8 ver- sion by replacing shutdown with a soft-start function. For a similar, pin compatible DC/DC converter with an output voltage as low as 0 ...
Page 2
... LTC3830ES8 CC1 PART MARKING PGND GND 3830 – SENSE FB ORDER PART + SENSE NUMBER SHDN LTC3830-1ES8 GN PACKAGE 16-LEAD PLASTIC SSOP T S8 JMAX T JMAX PART MARKING 38301 The ● denotes specifications that apply over the full operating temperature = 25° 5V, unless otherwise noted. (Note 2) ...
Page 3
... Note 3: Supply current in normal operation is dominated by the current needed to charge and discharge the external FET gates. This will vary with the LTC3830 operating frequency, operating voltage and the external FETs used. Note 4: The open-loop DC gain and transconductance from the SENSE – ...
Page 4
... LTC3830/LTC3830 TYPICAL PERFOR A CE CHARACTERISTICS Load Regulation 3. 25°C A REFER TO FIGURE 12 3.33 3.32 3.31 3.30 3.29 3.28 3.27 3.26 –10 – –15 0 OUTPUT CURRENT (A) 3830 G02 Output Voltage Temperature Drift 3.34 REFER TO FIGURE 12 OUTPUT = NO LOAD 3.33 3.32 3.31 3.30 3.29 3.28 3 ...
Page 5
... CC vs Temperature 1.6 FREQSET FLOATING 1.5 1.4 1.3 1.2 1.1 1.0 0.9 0.8 0.7 0.6 0.5 0.4 –50 – 100 125 TEMPERATURE (°C) 3830 G18 LTC3830/LTC3830-1 Output Overcurrent Protection 4.0 3.5 3.0 2.5 2.0 1.5 1 25°C A 0.5 REFER TO FIGURE IMAX ...
Page 6
... CC1 and the 8-lead LTC3830. SHDN (Pin 8/Pin 5/NA): Shutdown. A TTL compatible low + V . level at SHDN for longer than 100µs puts the LTC3830 into IN GS(ON)(Q1) shutdown mode. In shutdown, G1 and G2 go low, all internal circuits are disabled and the quiescent current drops to 10µA max. A TTL compatible high level at SHDN allows the part to operate normally ...
Page 7
... Power Supply Input. All low CC power internal circuits draw their supply from this pin. Connect this pin to a clean power supply, separate from the main V 4.7µF bypass capacitor. The LTC3830-1 and the 8-lead LTC3830 have V MAX require a 10µF bypass capacitor to GND. PV (Pin 15/Pin 7/Pin 7): Power Supply Input for G2 ...
Page 8
... N-channel power MOSFET as a current sensing element, eliminating the need for an external sense resistor. Also included in the 16-lead version and the LTC3830 internal soft-start feature that requires only a single external capacitor to operate. In addition, 16-lead parts ...
Page 9
... The 16-lead LTC3830 devices include a soft-start circuit that is used for start-up and current limit operation. The LTC3830-1 only has the soft-start function; the current limit function is disabled. The 8-lead LTC3830 has both the soft-start and current limit function disabled. The SS pin requires an external capacitor, C ...
Page 10
... The R is high if the V applied to the MOSFET is DS(ON) GS low. This occurs during power up, when PV up. To prevent the high R from activating the current DS(ON) limit, the LTC3830 disables the current limit circuit less than 2.5V above V CC1 CC LTC3830 R 0.1µF IMAX + ...
Page 11
... U U APPLICATIO S I FOR ATIO External Clock Synchronization The LTC3830 SHDN pin doubles as an external clock input for applications that require a synchronized clock. An internal circuit forces the LTC3830 into external synchro- nization mode if a negative transition at the SHDN pin is detected. In this mode, every negative transition on the ...
Page 12
... V . For best performance, connect the CC 4.7µF bypass capacitor as close to the LTC3830 V possible. Gate drive for the top N-channel MOSFET Q1 is supplied from PV . This supply must be above V ...
Page 13
... DS(ON) allowable power dissipation and maximum output current typical LTC3830 circuit, operating in continuous mode, the average inductor current is equal to the output load current. This current flows through either with the power dissipation split up according to the duty cycle: ...
Page 14
... The maximum rate of rise of inductor current is set by the inductor’s value, the input-to-output voltage differential and the LTC3830’s maximum duty cycle typical 5V input, 3.3V output application, the maximum rise time will be: DC ...
Page 15
... This action causes a temporary voltage droop at the output. To minimize this effect, the inductor value should usually be in the 1µH to 5µH range for most 5V input LTC3830 circuits. To optimize performance, different combinations of input and output voltages and expected loads may require different inductor values ...
Page 16
... ESR of 0.04Ω; three in parallel lower the net output capacitor ESR to 0.013Ω. Feedback Loop Compensation The LTC3830 voltage feedback loop is compensated at the COMP pin, which is the output node of the error amplifier. The feedback loop is generally compensated with network from COMP to GND as shown in Figure 10a. ...
Page 17
... LC ESR f CO Figure 10b. Bode Plot of the LTC3830 Overall Transfer Function W U Although a mathematical approach to frequency compen- sation can be used, the added complication of input and/or output filters, unknown capacitor ESR, and gross operat- ing point changes with input voltage, load current varia- tions, all suggest a more practical empirical method ...
Page 18
... The GND and PGND pins should be shorted directly at the LTC3830. This helps to minimize internal ground dis- turbances in the LTC3830 and prevent differences in ground potential from disrupting internal circuit operation. This C (nF) ...
Page 19
... Do not connect these parts to the ground plane! 4. The and PV decoupling capacitors should CC CC1 CC2 be as close to the LTC3830 as possible. The 4.7µF and 1µF bypass capacitors shown CC1 provide optimum regulation performance. + 4.7µF 1µF ...
Page 20
... LTC3830/LTC3830 APPLICATIO S I FOR ATIO 5V MBR0530T1 + 100Ω 1µ CC2 CC1 + 0.1µF 4.7µ MAX 0.01µF I LTC3830 FB NC FREQSET G2 SHUTDOWN SHDN PGND COMP GND SENSE 33pF 18k – SENSE 0.01µ 330µF × 0.1µ 0.1µF 2.5µH ...
Page 21
... TYP .008 – .012 (0.203 – 0.305) TYP LTC3830/LTC3830-1 .189 – .196* (4.801 – 4.978) .009 (0.229 REF .150 – .157** (3.810 – 3.988) ...
Page 22
... LTC3830/LTC3830-1 PACKAGE DESCRIPTIO .050 BSC .245 MIN .030 ±.005 TYP RECOMMENDED SOLDER PAD LAYOUT .010 – .020 (0.254 – 0.508) .008 – .010 (0.203 – 0.254) NOTE: 1. DIMENSIONS IN 2. DRAWING NOT TO SCALE 3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm) ...
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... N .053 – .069 (1.346 – 1.752) 0° – 8° TYP .014 – .019 (0.355 – 0.483) TYP LTC3830/LTC3830-1 .386 – .394 (9.804 – 10.008) NOTE .150 – .157 (3.810 – 3.988) NOTE 3 ...
Page 24
... Up to 40A : 1.5V, Uses Standard Logic-Level N-Channel IN ≤ 32V, 0.6V ≤ V ≤ 28V, Powerful Gate Drivers IN OUT Tracks 1 External Reference IN ≤ 5V, Pin-for-Pin Compatible with the LTC3830 OUT LT/LT 0305 • PRINTED IN USA © LINEAR TECHNOLOGY CORPORATION 2001 SENSE and 36V, 3830fa ...