Rainbow Electronics MAX859 - Manual (Page 7)

MAX856–MAX859
3.3V/5V or Adjustable-Output,
Step-Up DC-DC Converters
_______________________________________________________________________________________ 7
MAX856–MAX859
SHDN
3/5*
LBO
LBI
N
LBI COMPARATOR
ERROR COMPARATOR
CURRENT-LIMIT
COMPARATOR
ONE-SHOT
TRIG Q
Q
ONE-SHOT
TRIG
S Q
R
F/F
MINIMUM
OFF-TIME
ONE-SHOT
V IN
LX
N
GND
OUT
V OUT
**
FB**
**
*
*
REF
REFERENCE
MAXIMUM
ON-TIME
ONE-SHOT
*MAX856/MAX858 ONLY
**MAX857/MAX859 ONLY
Figure 1. Block Diagram