ISL9491AERZ-T Intersil, ISL9491AERZ-T Datasheet - Page 7

• Manufacturer Part Number: ISL9491AERZ-T
• Description: IC REG SGL LNB CONTROL 16QFN
• Manufacturer: Intersil

Specifications of ISL9491AERZ-T

• Applications: Converter, Satellite Set-Top Box Designs
• Voltage - Input: 8 V ~ 11 V
• Number Of Outputs: 1
• Voltage - Output: 11 V ~ 16 V
• Operating Temperature: -20°C ~ 85°C
• Mounting Type: *
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Electrical Specifications
OSCILLATOR
Oscillator Frequency
Thermal Shutdown
Temperature Shutdown Threshold
Temperature Shutdown Hysteresis
Tone Waveform
NOTES:
10. The tone rise and fall times are not shown due to resolution of graphics. It is 5/10µs typical.
11. The EXTM pins have input thresholds of Vil(max) = 0.8V and Vih(min) = 2.5V
Typical Performance Curves
5. VSET, EXTM, EN pins have 200kΩ internal pull-down resistors.
6. In the Dynamic current limit mode, the output is ON for 50ms and OFF for 900ms but it remains continuously ON when
7. This pin is to connect a bypass capacitor in order to decouple the internal LDO and is not designed to source external circuits.
8. The value of the R
9. This defines the back voltage applicable to the VSENSE pin. The VOUT pin will not support back bias and hence will need the
FIGURE 2. BOOST EFFICIENCY FOR 12V
RILIM=0.
use of a back diode for protection.
100
VOUT
EXTM
80
60
40
20
PIN
PIN
0
0
PARAMETER
14.3V
0.1
OUT
0.2
LIMIT
resistor will determine the overcurrent threshold at which the 50ms timer is activated.
I
0.3
LOAD
7
(A)
V
T
0.4
A
CC
SYMBOL
= +25°C. (Continued)
= 12V, T
f
sw
0.5
EXTERNAL TONE
t
r
IN
= 5/10µs TYPICAL
22kHz
A
ISL9491, ISL9491A
FIGURE 1. TONE WAVEFORM
0.6
TO
Boost switching frequency
(Note 4)
(Note 4)
= -20°C to +85°C, unless otherwise noted. Typical values are at
0.7
TEST CONDITIONS
22kHz
RETURNS TO NOMINAL VOUT ~1.5 PERIOD
AFTER THE LAST EXTM RISING EDGE
t_ISL9491~68µs / t_ISL9491A)~34µs
FIGURE 3. SYSTEM EFFICIENCY (BOOST + LDO) FOR
100
80
60
40
20
0
0
12V
0.1
IN
TO 13.3V
0.2
MIN
380
I
-
-
LOAD
OUT
0.3
(A)
TYP
440
130
20
0.4
MAX
480
October 13, 2009
-
-
0.5
FN6531.0
UNITS
kHz
0.6
°C
°C