ISL78113A Datasheet, PDF (1/12 Pages) Intersil Corporation – Low Input Voltage and High Efficiency Synchronous Boost Converter with 1.3A Switch

Low Input Voltage and High Efficiency Synchronous
Boost Converter with 1.3A Switch
ISL78113A
The ISL78113A provides a tiny and convenient boost power
supply solution to generate a regulated output up to 500mA
from any sub-5V secondary rail found in an automotive
electrical system, including battery powered applications
(NiCd, NiMH, or one-cell Li-Ion/Li-Polymer). It offers an
adjustable output (3.0V to 5.2V) supporting USB-OTG or HDMI
applications. The device is able to supply 500mA from a 3V
input and 5V output, and has a typical 1.3A peak current limit.
The ISL78113A is a fully integrated, internally compensated,
synchronous converter optimized to maximize efficiency and
reduce the overall solution size and bill of materials. Its high
2MHz switching frequency allows the use of tiny, low-profile
inductors and chip capacitors. It also eliminates potential
interference within the AM radio band and the external EMI
filtering needed for converters switching at lower rates. To
minimize power consumption while off, the device features an
ultra-low current shutdown mode dropping quiescent current
to 50nA typical.
ISL78113A is supplied in an 8 Ld DFN package. The device is
rated to operate over the temperature range of -40°C to
+105°C.
Features
• Output disconnect during shutdown preventing output
precharging and uncontrolled short-circuit current
• Input voltage range: 0.8V to 4.7V
• Output current: Up to 500mA (V_BAT = 3V, V_OUT = 5V)
• Logic control shutdown (I_Q < 1µA)
• 2MHz switching frequency
• Up to 95% efficiency at typical operating conditions
• Fault protection: OVP, OCP, OTP, UVLO
• 2mmx2mm 8 Ld DFN package
• Qualified for automotive operations
Applications
• Automotive head units and infotainment systems: especially
those including portable HDMI and USB-OTG connectivity
• Automotive camera systems
6.8 µH
V_BAT =
0.8V TO 4.7V
10µF
8
SW
7
V_BAT
5
EN
2
V_OUT
4
FB
1
GND
V_OUT =
5.0V/500mA
422
10µF
80.6
ISL78113AARAZ
FIGURE 1. TYPICAL APPLICATION
100
90
80
70
60
50
40
30
20
10
0
0
V_BAT = 3.6V
V_BAT = 4.2V
V_BAT = 2.3V
V_BAT = 3.4V
V_BAT = 3V
0.1
0.2
0.3
0.4
0.5
0.6
LOAD CURRENT I_LOAD (A)
FIGURE 2. EFFICIENCY vs LOAD CURRENT
May 1, 2014
1
FN8638.0
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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