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STMicroelectronics Electronic Components Datasheet

L5985 Datasheet

2A step-down switching regulator

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L5985 pdf
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L5985
2A step-down switching regulator
Features
2A DC output current
2.9V to 18V input voltage
Output voltage adjustable from 0.6V
250KHz switching frequency, programmable
up to 1MHz
Internal Soft-start and Inhibit
Low dropout operation: 100% duty cycle
Voltage feed-forward
Zero load current operation
Over current and thermal protection
VQFN3x3-8L package
Applications
Consumer:
STB, DVD, DVD recorder, car audio, LCD TV
and monitors
Industrial:
Chargers, car battery, PLD, PLA, FPGA
Networking: XDSL, modems, DC-DC modules
Computer:
Optical storage, hard disk drive, printers,
audio/graphic cards
Figure 1. Application circuit
VFQFPN8 3x3
Description
The L5985 is a step down switching regulator with
2.5A current limited embedded power MOSFET,
so it is able to deliver up to 2A DC current to the
load depending on the application condition.
The input voltage can range from 2.9V to 18V,
while the output voltage can be set starting from
0.6V to VIN. Having a minimum input voltage of
2.9V, the device is suitable for buses staring from
for 3.3V bus.
Requiring a minimum set of external components,
the device includes an internal 250KHz switching
frequency oscillator that can be externally
adjusted up to 1MHz.
The QFN package with exposed pad allows
reducing the RthJA down to approximately
60°C/W.
October 2007
Rev 2
1/36
www.st.com
1


STMicroelectronics Electronic Components Datasheet

L5985 Datasheet

2A step-down switching regulator

No Preview Available !

L5985 pdf
www.DataSLh5e9et845U.com
Contents
Contents
1 Pin settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1 Pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4 Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4.1 Oscillator and Synchronization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4.2 Soft-start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4.3 Error amplifier and compensation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.4 Over-current protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.5 Inhibit function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.6 Hysteretic thermal shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5 Application informations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.1 Input capacitor selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.2 Inductor selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.3 Output capacitor selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.4 Compensation network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5.4.1 Type III compensation network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
5.4.2 Type II compensation network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
5.5 Thermal considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
5.6 Layout considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
5.7 Application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
6 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
7 Order code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
8 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
2/36


Part Number L5985
Description 2A step-down switching regulator
Maker STMicroelectronics
Total Page 30 Pages
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