step-down regulator - Integral
Description
IZ1583
General Description The IZ1583 is a step-down regulator with a built in internal power MOSFET.
The IC provide 3A continuous output current over a wide supply voltage range.
The IC can be used as distributed power source, battery charger, pre-regulator for linear regulators.
Features • Wide supply voltage range 4,75 … 23 V.
• Wide operating temperature range -40 … +85 oC.
• Active mode consumption current (max.
) 1,2 mA .
• Chip dimensions 1,91 × 1,42 mm.
• ICs are available for shipment in chip form on unsawn wafers • Functionality IC performs driving of power built in MOSFET switch, quantity of energy transferred to load is regulated by means of MOSFET on-time (pulse-width modulation).
So ouput voltage practically do not depends from load.
Table 1 – Contact pad description Pad number Symbol Description 01 BS n-channel power output MOSFET switch drive input 02 V IC supply pin.
Connected to 6,5V … 32 V power source.
Bypass Vcc CC to GND with a suitably large capacitor to eliminate noise on the input to the IC.
03 SW Power switch output.
SW has to be connected by output LC filter to the output load and by mentioned capacitor to BS.
04 GND Common pin (ground) Feedback Input, has to be connected by a resistive voltage divider to 05 FB output voltage 06 COMP Frequency compensation Node has to be connected by series RC network to GND 07 EN Digital enable/disable input.
High level applied to EN turns IC ON and low level – turns it OFF.
For automatic startup, leave EN unconnected.
08 SS Soft Start.
SS is purposed to control the soft start period.
To set soft start mode connect SS & GND by capacitor.
A 0.
1µF capacitor sets the soft-start period to 10ms.
To disable the soft-start feature, leave SS unconnected.
1
Ver.
00/10.
11.
2008
http://www.
Datasheet4U.
com
IZ1583
V CC
Internal Regulators
Current limiter
Oscilator 40/385 kHz
5V M1 S Q R Q M2
BS SW
Shutdown comparator
EN
0,7V
1uA
PWMcomparator
100K
GND
1,8 V
2,285/2,495V
Lockout comparator
0,7V
1,22V
Freq...
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