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STMicroelectronics Electronic Components Datasheet

L5988D Datasheet

4A continuous (more than 5 A pulsed) step-down switching regulator

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L5988D pdf
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L5988D
4 A continuous (more than 5 A pulsed) step-down switching
regulator with synchronous rectification
Preliminary Data
Features
I 4 A output current (more than 5 pulsed)
I Operating input voltage from 2.9 V to 18 V
I External 1.8 V ± 2 % reference voltage
I Output voltage from 0.6 to input voltage
I MLCC compatible
I 200 ns TON
I Programmable UVLO matches 3.3 V, 5 V and
12 V bus
I FSW programmable up to 1 MHz
I Voltage feed-forward
I Zero-load current operation
I Programmable current limit on both switches
I Programmable sink current capability
I Pre-bias start up capability
I Thermal shutdown
HTSSOP 16
Applications
I Consumer: STB, DVD, LCD TV, VCR, car
radio, LCD monitors
I Networking: XDSL, modems, routers and
switches
I Computer and peripherals: printers, audio /
graphic cards, optical storage, hard disk drive
I Industrial: DC-DC modules, factory automation
Figure 1. Test application circuit
January 2009
Rev 1
This is preliminary information on a new product now in development or undergoing evaluation.
Details are subject to change without notice.
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www.st.com
53


STMicroelectronics Electronic Components Datasheet

L5988D Datasheet

4A continuous (more than 5 A pulsed) step-down switching regulator

No Preview Available !

L5988D pdf
www.DataSChoeent4teUn.ctosm
Contents
L5988D
1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2 Pin function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
5 Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5.1 Multifunction pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.2 Oscillator and synchronization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.3 External voltage reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5.4 Soft-start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5.5 Monitoring and protections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
5.5.1 Overvoltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
5.5.2 Current limiting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5.5.3 UVLO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
5.5.4 Thermal shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
5.6 Minimum on time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
5.7 Error amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
6 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
6.1 Input capacitor selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
6.2 Inductor selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
6.3 Output capacitor selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
6.4 Compensation network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
6.4.1 Type III compensation network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
6.4.2 Type II compensation network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
6.5 R.M.S. current of the embedded power MOSFETs . . . . . . . . . . . . . . . . . 36
6.6 Thermal considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
6.7 Layout considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
6.8 Application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
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Part Number L5988D
Description 4A continuous (more than 5 A pulsed) step-down switching regulator
Maker ST Microelectronics
Total Page 30 Pages
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