isl9444 Intersil Corporation, isl9444 Datasheet - Page 2

• Manufacturer Part Number: isl9444
• Manufacturer: Intersil Corporation

Ordering Information
NOTES:
Pin Configuration
Pin Descriptions
ISL9444IRZ
1. Add “-T*” for tape and reel. Please refer to TB347 for details on reel specifications.
2. These Intersil Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach materials, and 100% matte
3. For Moisture Sensitivity Level (MSL), please see device information page for ISL9444. For more information on MSL please see techbrief TB363.
tin plate plus anneal (e3 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations). Intersil
Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.
PIN
1
2
3
4
5
PART NUMBER
(Notes 1, 2, 3)
EXTBIAS
VCC_5V
NAME
PFO
PFI
VIN
Output of the auxiliary power monitor. PFO goes high if the voltage on PFI is greater than 1.2V (typical). Otherwise the
PFO outputs low.
Input to the auxiliary power monitor. The internal threshold voltage is 1.2V (typical).
Input from an optional external 5V bias supply. There is an internal switch from this pin to VCC_5V. This switch closes and
supplies the IC power, bypassing the internal linear regulator, when voltage at EXTBIAS is higher than 4.7V (typ). Do not
allow voltage at the EXTBIAS pin to exceed VIN at any time.
Decouple this pin to ground with a small ceramic capacitor (0.1µF to 1µF) when it is in use, otherwise tie this pin to
ground. Do not float this pin.
Output of the internal 5V linear regulator. This output supplies bias for the IC, the low side gate drivers, and the external
boot circuitry for the high-side gate drivers. The VCC_5V pin must be always decoupled to power ground with a minimum
of 4.7µF ceramic capacitor, placed very close to the pin. Do not allow the voltage at VCC_5V to exceed VIN at any time.
This pin should be tied to the input rail. It provides power to the internal linear drive circuitry and is also used by the
feed-forward controller to adjust the amplitude of each PWM sawtooth. Decouple this pin with a small ceramic capacitor
(0.1µF to 1µF) to ground.
2
ISL9444 IRZ
EXTBIAS
PGOOD1
OCSET1
VCC_5V
EN/SS1
MARKING
PFO
FB1
VIN
PFI
RT
PART
10
1
2
3
4
5
6
7
8
9
11 12 13 14 15 16 17 18 19 20
40 39 38 37 36 35 34 33 32 31
ISL9444
(40 LD 5x5 QFN)
TOP VIEW
ISL9444
TEMP. RANGE
-40 to +85
(°C)
FUNCTION
40 Ld 5x5 QFN
30
29
28
27
26
25
24
23
22
21
CLKOUT
PGND
LGATE3
UGATE3
BOOT3
PHASE3
ISEN3
MODE/SYNC
EN3
TK/SS3
PACKAGE
(Pb-Free)
L40.5X5B
DWG. #
PKG.
May 23, 2011
FN7665.0