lt1432 Linear Technology Corporation, lt1432 Datasheet
lt1432
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lt1432 Summary of contents
Page 1
... In Burst Mode operation, standby loss is reduced to approximately 11mW. Output current in this mode is typically in the 5mA to 100mA range. The LT1432-3.3 is available in 8-pin SO and PDIP pack- ages. The LT1171/LT1271 is also available in surface mount DD packages. 10µH ...
Page 2
... 1.5V (Forced 26V, OUT – 1V – 1. (Note 150 A to 250 TOP VIEW ORDER PART NUMBER 8 MODE 7 GND LT1432CN8-3 LT1432CS8-3.3 5 DIODE S8 PACKAGE 8-LEAD PLASTIC SO = 150 C/W (N8 170 C/W (S8) JA MIN TYP MAX 3.24 3.30 3. 0.3 0.5 0.9 1 0.6 0.9 1.5 0.25 0.45 0.45 0.8 1 ...
Page 3
... SW IN LT1271 FB V GND DIODE S1** S2** MODE CONTROL 8 Figure 2 LT1432-3.3 MIN TYP 1.6 80 120 3.0 4.5 4 < OUT 30 pin switched from 3.6V to 3.0V. OPTIONAL CONNECTION OUT LIM 1 2 60mV + – + – 7 MODE GND LT1432-3.3 F02 MAX UNITS 2 p ...
Page 4
... Input Voltage 5 5.0 4.5 4.0 3 LOAD CURRENT (mA) LT1432-3.3 G05 Current Limit Sense Voltage 100 0 25 JUNCTION TEMPERATURE ( C) LT1432-3.3 G08 * TEMPERATURE COEFFICIENT OF SENSE VOLTAGE IS DESIGNED TO TRACK COPPER RESISTANCE. LT1270 LT1432-3.3 G03 40 50 LT1432-3.3 G06 75 100 LT1432-3.3 G9 ...
Page 5
... MODE PIN VOLTAGE (V) LT1432-3.3 G14 Start-up Switch Characteristics NOTE VERTICAL AND HORIZONTAL SCALE CHANGES AT 0,0 –20 –40 –60 –80 –2 – 100 + VOLTAGE IN LT1432-3.3 G16 to V OUT C 75 100 LT1432-3.3 G12 8 10 LT1432-3.3 G15 20 30 LT1432-3.3 G18 5 ...
Page 6
... A floating power supply for the switcher is generated by D2 and C3 which peak detect the input voltage during switch off time. This is different than the 5V version of the LT1432 which connects the anode of the diode to the output rather than the input. The output connection is more efficient because the floating voltage is a constant 5V (or 3 ...
Page 7
... D1, L1 and C2 act as the conventional catch diode and output filter of the buck converter. These components should be selected carefully to maintain high efficiency and acceptable output ripple. See the original LT1432 (5V) data sheet for detailed discussions of these parts. Current limiting is performed by R2. Sense voltage is only 60mV to maintain high efficiency ...
Page 8
... Full Shutdown When the Mode pin is driven high, full shutdown of the regulator occurs. Regulator input current will then consist of the LT1432 shutdown current ( 15 A) plus the switch leakage of the switching A). Mode input current ( 5V) must also be considered. Start-up ...