MAX756

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756 . . .

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, 1 . . , , .

756 [1] . 1.

   MAX756
. 1

VT1. . DA1, L1, VD1 C1 C2 . - . VT1 , C2, VD1 , L1 . , . VT1 VD1 C2. , L1 .

, , VT1 . , VD1 L1. VT1 , L1. , 2, .

, , . , , . .

Maxim, [2], 756 . 756 3,3 5 300 200 . , , - 0,7 .

( LBI/LBO; Low Battery Input, Low Battery Output - ). 756 , , LBI , 1,25 . LBO . LBI 1,25 , lBo . , .

LBO , , , . 756 (0,7 ) 1,5 Ni-Cd Ni-MH 1,2 . , U = 1,25 1 , .

756, [2], . 2. 756 (DA1). LBI (1,25 ), LBO , VT1 VT2 .

   MAX756
. 2



U=U(R1+R2)/R2,

VT1 VT2 . R1 R2 3,75 .

[2] . 3. - , - . , 1 65 2,5 . 0,8 45 45 .

   MAX756
. 3

. 2 : LBI/LBO : , , .

, . 4, . [2] . DA2. ( 3) , VT1.1 VT1.2 , . 3 . 4,7 , 3 DA2 , VT1.1 R1 . VT1.1 VT1.2 , .

   MAX756
. 4

. 5 756, . LBI/LBO . . 4, , . 4 , VT1 , , . 4 R1 , VT1 , .

   MAX756
. 5

tB ( ) 3 (1.10) [3]:

t3=R1C4ln(U/( U - U)),

R1 - R1 ; C4- C4 ; U - ( ).

, [4] 1,5...3,5 . R1 4, , .

756 14461. ZVP2110A [4] , 200 , , ZVP2106, BSP315, MMBF2202PT1. MMDF2P02E - p- , . 2 . , . 2N3904 2N3903, 2N4400, 2N4401 315, 3102 . IRF7307 IRF7317 IRF7507. 1N5817 1N5819, 1 N5820.

  1. MAX756/MAX757 3.3V/5V/Adjustable-Output Step-Up DC-DC Converters.
  2. Switch allows low-voltage regulator to start under load. - Maxim Engineering Journal, vol.21, p.20.
  3. . . . - .: , 1991.
  4. ZVP2110A P-Channel Enhancement Mode Vertical DMOS FET.
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