ISL8036 Datasheet, PDF (1/25 Pages) Intersil Corporation – Dual 3A 1MHz/2.5MHz High Efficiency Synchronous Buck Regulator

Dual 3A 1MHz/2.5MHz High Efficiency Synchronous
Buck Regulator
ISL8036, ISL8036A
ISL8036, ISL8036A are integrated power controllers
rated for dual 3A output current or current sharing
operation with a 1MHz (ISL8036)/2.5MHz (ISL8036A)
step-down regulator, which is ideal for any low power
low-voltage applications. The channels are 180°
out-of-phase for input RMS current and EMI reduction. It
is optimized for generating low output voltages down to
0.8V each. The supply voltage range is from 2.8V to 6V,
allowing for the use of a single Li+ cell, three NiMH cells
or a regulated 5V input. The two channels are 180
degrees out of phase, and each one has a guaranteed
minimum output current of 3A. They can be combined to
form a single 6A output in the current sharing mode.
While in current sharing, the interleaved PWM signals
reduce input and output ripple.
The ISL8036, ISL8036A includes a pair of low
ON-resistance P-channel and N-channel internal
MOSFETs to maximize efficiency and minimize external
component count. 100% duty-cycle operation allows less
than 250mV dropout voltage at 3A each.
The ISL8036, ISL8036A offers an independent 1ms
Power-good (PG) timer at power-up. When shutdown,
ISL8036, ISL8036A discharges the output capacitor.
Other features include internal digital soft-start, enable
for power sequence, overcurrent protection, and thermal
shutdown.
The ISL8036, ISL8036A is offered in a 24 Ld 4mmx4mm
QFN package with 1mm maximum height. The complete
converter occupies less than 1.5cm² area.
Features
• 3A High Efficiency Synchronous Buck Regulator with
up to 95% Efficiency
• 2% Output Accuracy Over-Temperature/Load/Line
• Internal Digital Soft-Start - 1.5ms
• 6A Current Sharing Mode Operation
• External Synchronization up to 6MHz
• Internal Current Mode Compensation
• Peak Current Limiting and Hiccup Mode Short Circuit
Protection
• Reverse Overcurrent Protection
Applications*(see page 24)
• DC/DC POL Modules
• µC/µP, FPGA and DSP Power
• Plug-in DC/DC Modules for Routers and Switchers
• Test and Measurement Systems
• Li-ion Battery Power Devices
• Bar Code Reader
Efficiency Characteristics Curve
100
90
80
3.3V_OUT- PWM
70
60
50
40
0
1
2
3
4
5
6
OUTPUT LOAD (A)
FIGURE 1. EFFICIENCY vs LOAD, 1MHz 5V_IN PWM, T_A = +25°C
October 18, 2010
FN6853.1
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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