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PDF IR3870MBF Data sheet ( Hoja de datos )
| Número de pieza | IR3870MBF | |
| Descripción | SYNCHRONOUS BUCK REGULATOR | |
| Fabricantes | International Rectifier | |
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PD-97392
IR3870MBFwww.DataSheet4U.com
SupIRBuckTM
10A HIGHLY INTEGRATED
WIDE-INPUT VOLTAGE, SYNCHRONOUS BUCK REGULATOR
Features
• Input Voltage Range: 3V to 26V
• Output Voltage Range: 0.5V to 12V
• Continuous 10A Load Capability
• Constant On-Time control
• Excellent Efficiency at very low output current levels
• Gate drive charge pump option to maximize
efficiency at higher output current levels
• Compensation Loop not Required
• Programmable switching frequency, soft start, and
over current protection
• Power Good Output
• Precision Voltage Reference (0.5V, +/-1%)
• Enable Input with Voltage Monitoring Capability
• Pre-bias Start Up
• Under/Over Voltage Fault Protection
• Ultra small, low profile 5 x 6mm QFN Package
• Lead-free, halogen-free and RoHS compliant
Applications
• Notebook and desktop computers
• Game consoles
• Consumer electronics - STB, LCD TV, Printers
• General purpose POL DC-DC Converters
Description
The IR3870M SupIRBuckTM is an easy-to-use,
fully integrated and highly efficient DC/DC
voltage regulator. The onboard constant on time
hysteretic controller and MOSFETs make IR3870
a space-efficient solution that delivers up to 10A
of precisely controlled output voltage in 60°C
ambient temperature applications without airflow.
Programmable switching frequency, soft start,
and over current protection allows for a very
flexible solution suitable for many different
applications. The combination of the gate drive
charge pump option and constant on time control
allow efficiency optimization in the whole output
current range, making this device an ideal choice
for battery powered applications.
Additional features include pre-bias startup, very
precise 0.5V reference, over/under voltage shut
down, power good output, and enable input with
voltage monitoring capability.
1/27/2010
Typical Notebook Application Circuit Diagram
1
1 page  
Recommended Operating Conditions
IR3870MBFwww.DataSheet4U.com
Symbol
VIN
VCC
Boot to
PHASE
VOUT
IOUT
Fs
Definition
Input Voltage
Supply Voltage
Supply Voltage
Output Voltage
Output Current
Switching Frequency
* Note: PHASE pin must not exceed 30V.
Min
3
3
0.5
0
Max
26*
3.6
7.0
12
10
1000
Units
V
A
kHz
Electrical Specifications
Unless otherwise specified, these specification apply over VIN = 12V, PVCC = 7VDC, 0oC ≤ TJ ≤ 125oC.
PARAMETER
BIAS SUPPLIES
VCC Turn-on Threshold
NOTE
TEST CONDITION
VCC Turn-off Threshold
VCC Threshold Hysteresis
PVCC Turn-on Threshold
PVCC Turn-off Threshold
PVCC Threshold Hysteresis
VCC Shutdown Current
VCC Operating Current
PVCC Operating Current
PVCC Shutdown Current
FF Shutdown Current
VIN Shutdown Current
PHASE Shutdown Current
CONTROL LOOP
Reference Accuracy, VREF
On-Time Accuracy
Min Off Time
EN=LOW
RFF = 180kΩ, EN = HIGH
RFF = 180kΩ,
EN = HIGH, Fs = 500kHz
EN=LOW
EN=LOW
EN=LOW
EN=LOW
RFF = 180 kΩ, TJ = 650C
Soft-Start Current
EN = HIGH
FAULT PROTECTION
ISET pin output current
Under Voltage Threshold
Falling VFB & monitor PGOOD
Under Voltage Hysteresis
Rising VFB
Over Voltage Threshold
Rising VFB & monitor PGOOD
Over Voltage Hysteresis
1 Rising VFB
PGOOD Delay Threshold (VSS)
MIN TYP MAX UNIT
3V
2.65 V
60 mV
3.05 V
2.65 V
60 mV
30 60 μA
1.2 mA
8 mA
20 60
0.1 2
01
0.25 2
μA
μA
μA
μA
0.495 0.5 0.505
280 300 320
V
ns
300 ns
8 10 12 μA
18 20 22 μA
0.37 0.4 0.43
V
7.5 mV
0.56 0.6 0.64
V
7.5 mV
0.6 V
5
5 Page 
IR3870MBFwww.DataSheet4U.com
TYPICAL APPLICATION CIRCUIT WITH CHARGE PUMP OPTION
Figure 15. Application Circuit with Charge Pump used to boost Sync FET gate
drive voltage from 5V to ~7V, resulting in improved efficiency at higher output
current levels
F = 500kHz, VOUT = 1.1V
11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet IR3870MBF.PDF ] | |
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