ISL85033IRTZ-T Intersil, ISL85033IRTZ-T Datasheet - Page 3

• Manufacturer Part Number: ISL85033IRTZ-T
• Description: IC REG BUCK ADJ DUAL 28TQFN
• Manufacturer: Intersil
• Type: Step-Down (Buck)r

Specifications of ISL85033IRTZ-T

• Internal Switch(s): Yes
• Synchronous Rectifier: Yes
• Number Of Outputs: 2
• Voltage - Output: 0.8 ~ 28 V
• Current - Output: 3A
• Frequency - Switching: 300kHz ~ 2MHz
• Voltage - Input: 4.5 ~ 28 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 28-WFQFN exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -

Pin Descriptions
Typical Application Schematics
PIN NUMBER
22, 28
V
3A
24
25
26
27
OUT2
-
V
C
47 µ F
OUT2
13
PGOOD1, PGOOD2 Open drain power-good output that is pulled to ground when the output voltage is below
7µ H
L
B340B
2
SYMBOL
SYNCIN
D
SGND
2
NC
FS
PD
VCC
VCC
VCC
68pF
C
3
FIGURE 2. DUAL 3A OUTPUT (VIN RANGE FROM 4.5V TO 28V)
25.5k
4
R
PGOOD2
PGOOD1
(Continued)
PHASE2
5
BOOT2
C
10nF
SS2
SS1
12
Connect to an external signal for synchronization from 300kHz to 2MHz (negative edge
FS
trigger). SYNCIN is not allowed to be floating.
When SYNCIN = logic 0, PHASE1 and PHASE2 are running at 180° out-of-phase.
When SYNCIN = logic 1, PHASE1 and PHASE2 are running at 0° in-phase.
When SYNCIN = an external clock, PHASE1 and PHASE2 are running at 180° out-of-phase.
Set the internal switching frequency 20% lower than the external SYNC frequency applied
to the SYNCIN pin.
Signal ground connections. The exposed pad must be connected to SGND and soldered to
the PCB. All voltage levels are measured with respect to this pin.
This is a no connection pin.
Frequency selection pin. Tie to VCC for 500kHz switching frequency. Connect a resistor to
GND for adjustable frequency from 300kHz to 2MHz.
regulation limits or during the soft-start interval. There is an internal 5MΩ internal pull-up
resistor.
The exposed pad must be connected to the system GND plane with as many vias as
possible for proper electrical and thermal performance.
27
19
3
22
28
15/16
17
20
24 23
21
C
470pF
R
69.8k
5
8
8.06k
ISL85033
ISL85033
R
ISL85033
12 26
6
10 25
8.06k
R
470pF
69.8k
2
PIN DESCRIPTION
R
C
2
4
1
11
4.7µF
13/14
2
8/9
6/7
5
VIN1
VIN2
PHASE1
BOOT1
10 µ F
42.2k
R
10nF
C
68pF
1
C
C
8
72
1
C
20 µ F
B340B
71
D
1
7µ H
L1
47 µ F
V
C
OUT1
9
December 8, 2010
V
OUT1
3A
FN6676.2