ISL78228ARZ INTERSIL [Intersil Corporation], ISL78228ARZ Datasheet
ISL78228ARZ
Available stocks
Related parts for ISL78228ARZ
ISL78228ARZ Summary of contents
Page 1
Dual 800mA Low Quiescent Current 2.25MHz High Efficiency Synchronous Buck Regulator ISL78228 The ISL78228 is a high efficiency, dual synchronous step-down DC/DC regulator that can deliver up to 800mA continuous output current per channel. The supply voltage range of 2.75V ...
Page 2
Typical Application INPUT 2.75V TO 5.5V C1 10µF 2 ISL78228 L1 2.2µH LX1 C2 10µF PGND FB1 VIN EN1 100k ISL78228 EN2 L2 2.2µH LX2 PG C4 10µF PGND SYNC FB2 100k PGND OUTPUT1 2.5V/800mA C3 10pF R2 316k R3 ...
Page 3
... Ordering Information PART NUMBER (Notes MARKING ISL78228ARZ 8228 NOTES: 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 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 ...
Page 4
Absolute Maximum Ratings Supply Voltage ( ...
Page 5
Electrical Specifications Unless otherwise noted, all parameter limits are established over the recommended operating conditions -40°C to +105° 2.75V to 5.5V, EN1 = EN2 = 800mA. (Typical ...
Page 6
Typical Operating Performance V = 2.75V to 5.5V 2.2µ 800mA. 100 90 80 2.5V - PWM OUT 70 1.5V OUT 1.2V - PWM OUT 60 ...
Page 7
Typical Operating Performance V = 2.75V to 5.5V 2.2µ 800mA. (Continued) 1. PFM MODE IN 1.55 3.3V V PFM IN 1.54 1.53 1.52 ...
Page 8
Typical Operating Performance V = 2.75V to 5.5V 2.2µ 800mA. (Continued) 500ns/DIV LX1 2V/DIV V RIPPLE 20mV/DIV OUT1 I 0.5A/DIV L1 FIGURE 14. STEADY STATE ...
Page 9
Typical Operating Performance V = 2.75V to 5.5V 2.2µ 800mA. (Continued) V RIPPLE 20mV/DIV OUT1 I 0.5A/DIV L1 50µs/DIV FIGURE 20. LOAD TRANSIENT CHANNEL 1 ...
Page 10
Typical Operating Performance V = 2.75V to 5.5V 2.2µ 800mA. (Continued) 50µs/DIV FIGURE 26. SOFT-START AT NO LOAD CHANNEL 1 (PFM) 50µs/DIV FIGURE 28. SOFT-START ...
Page 11
Typical Operating Performance V = 2.75V to 5.5V 2.2µ 800mA. (Continued) 200ns/DIV LX1 2V/DIV SYNCH 2V/DIV V RIPPLE 20mV/DIV I 0.5A/DIV OUT1 L1 FIGURE 32. ...
Page 12
Typical Operating Performance V = 2.75V to 5.5V 2.2µ 800mA. (Continued) PHASE1 5V/DIV I 0.5A/DIV L1 V 1V/DIV OUT1 PG 5V/DIV FIGURE 38. OUTPUT SHORT ...
Page 13
Block Diagram SOFT- START SHUTDOWN + EN1 0.6V BANDGAP + EAMP - 3pF SLOPE COMP FB1 0.3V 1.6k + VIN 0.552V - 1M PG 1ms DELAY SGND SOFT- START SHUTDOWN + EN2 0.6V BANDGAP EAMP + - 3pF SLOPE COMP ...
Page 14
Theory of Operation The ISL78228 is a dual 800mA step-down switching regulator optimized for battery-powered or mobile applications. The regulator operates at 2.25MHz fixed switching frequency under heavy load conditions to allow small external inductor and capacitors to be used ...
Page 15
P-MOSFET is turned off immediately. Then the inductor current is fully discharged to zero and stays at zero. The output voltage reduces gradually due to the load current discharging the output capacitor. When the output voltage drops to the nominal ...
Page 16
ISL78228 uses internal compensation network and the output capacitor value is dependent on the output voltage. The ceramic capacitor is recommended to be X5R or X7R. The recommended minimum output capacitor values are shown in Table 2 for the ISL78228. ...
Page 17
Revision History The revision history provided is for informational purposes only and is believed to be accurate, but not warranted. Please go to web to make sure you have the latest Rev. DATE REVISION 5/2/11 FN7849.0 Initial Release Products Intersil ...
Page 18
Package Outline Drawing L10.3x3C 10 LEAD DUAL FLAT PACKAGE (DFN) Rev 2, 09/09 3.00 6 PIN 1 INDEX AREA C B (4X) 0.10 TOP VIEW PACKAGE OUTLINE (10 x 0.60) (10x 0.25) (8x 0.50) 1.64 TYPICAL RECOMMENDED LAND PATTERN 18 ...