Datasheet

MAX17499/MAX17500
Current-Mode PWM Controllers with
Programmable Switching Frequency
______________________________________________________________________________________ 17
Selector Guide
* The MAX17499 does not have an internal bootstrap UVLO. The
MAX17499 starts operation as long as V
IN
is higher than 9.5V
and UVLO/EN is higher than 1.23V.
PART*
BOOTSTRAP
UVLO
STARTUP
VOLTAGE (V)
MAX DUTY
CYCLE (%)
MAX17499A No 9.5 50
MAX17499B No 9.5 75
MAX17500A Yes 22 50
MAX17500B Yes 22 75
Chip Information
PROCESS: BiCMOS
DRIVER
FB
CS
NDRV
GND
IN
COMP
UVLO/EN
IN
CLAMP
26.1V
*MAX17500 ONLY
*
UFLG
V
CC
MAX17499
MAX17500
ERROR
AMP
CPWM
UVLO
RT
OSCILLATOR
ILIM
S
R
REG_OK
REGULATOR
(INTERNAL 5.25V
SUPPLY)
IN
V
L
V
CC
Q
1.23V
1.17V
V
CS
1V
1.4V
DIGITAL
SOFT-START
REFERENCE
1.23V
N
210μs
DELAY
BOOTSTRAP UVLO
21.6V
9.74V
Functional Diagram
Package Information
For the latest package outline information and land patterns
(footprints), go to www.maxim-ic.com/packages
. Note that a
“+”, “#”, or “-” in the package code indicates RoHS status only.
Package drawings may show a different suffix character, but
the drawing pertains to the package regardless of RoHS status.
PACKAGE
TYPE
PACKAGE
CODE
OUTLINE
NO.
LAND
PATTERN NO.
10 μMAX U10+2
21-0061 90-0330