ISL78228ARZ INTERSIL [Intersil Corporation], ISL78228ARZ Datasheet - Page 3

• Manufacturer Part Number: ISL78228ARZ
• Description: Dual 800mA Low Quiescent Current 2.25MHz High Efficiency Synchronous Buck Regulator
• Manufacturer: INTERSIL [Intersil Corporation]

Pin Configuration
Ordering Information
NOTES:
Pin Descriptions
ISL78228ARZ
1. Add “-T*” suffix for tape and reel. Please refer to
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 ISL78228. For more information on MSL please see techbrief TB363.
DFN
10
1
2
3
4
6
7
8
9
5
-
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.
SYMBOL
PART NUMBER
(Notes 1, 2, 3)
SYNC
EN1
EN2
PAD
FB1
LX1
LX2
FB2
VIN
NC
PG
The feedback network of the Channel 1 regulator. FB1 is the negative input to the transconductance error amplifier. The output
voltage is set by an external resistor divider connected to FB1. With a properly selected divider, the output voltage can be set to any
voltage between the power rail (reduced by converter losses) and the 0.6V reference. There is an internal compensation to meet a
typical application. In addition, the regulator power-good and undervoltage protection circuitry use FB1 to monitor the Channel 1
regulator output voltage.
Regulator Channel 1 enable pin. Enable the output, V
capacitor when driven to low. Do not leave this pin floating.
Input supply voltage. Connect 10µF ceramic capacitor to power ground.
Switching node connection for Channel 1. Connect to one terminal of inductor for V
Recommended to connect this pin to the exposed pad.
Mode Selection pin. Connect to logic high or input voltage VIN for PFM mode; connect to logic low or ground for forced PWM mode.
Connect to an external function generator for Synchronization, and negative edge trigger. Do not leave this pin floating.
Switching node connection for Channel 2. Connect to one terminal of inductor for V
1ms timer output. At power-up or EN_ HI, this output is a 1ms delayed Power-Good signal for both the V
There is an internal 1MΩ pull-up resistor.
Regulator Channel 2 enable pin. Enable the output, V
capacitor when driven to low. Do not leave this pin floating.
The feedback network of the Channel 2 regulator. FB2 is the negative input to the transconductance error amplifier. The output
voltage is set by an external resistor divider connected to FB2. With a properly selected divider, the output voltage can be set to any
voltage between the power-rail (reduced by converter losses) and the 0.6V reference. There is an internal compensation to meet a
typical application.
In addition, the regulator power-good and undervoltage protection circuitry use FB2 to monitor the Channel 2 regulator output voltage.
The exposed pad must be connected to PGND for proper electrical performance. Add as much vias as possible for optimal thermal
performance.
3
8228
MARKING
PART
EN1
FB1
VIN
LX1
TB347
NC
for details on reel specifications.
1
2
3
4
5
ISL78228
TEMP. RANGE
(10 LD 3X3 DFN)
-40 to +105
ISL78228
TOP VIEW
(°C)
PAD
OUT1
OUT2
DESCRIPTION
, when driven to high. Shutdown the V
, when driven to high. Shutdown the V
10 Ld 3x3 DFN
10
9
8
7
6
FB2
EN2
PG
LX2
SYNC
PACKAGE
(Pb-Free)
OUT1
OUT2
.
.
OUT1
OUT2
and discharge output
and discharge output
L10.3x3C
OUT1
and V
DWG. #
PKG.
OUT2
May 2, 2011
voltages.
FN7849.0