L5988D Datasheet PDF - ST Microelectronics
Part Number | L5988D | |
Description | 4A continuous (more than 5 A pulsed) step-down switching regulator | |
Manufacturers | ST Microelectronics | |
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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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List of figures
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Test application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Voltage mode control loop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Internal block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Oscillator circuit block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Sawtooth: voltage feed forward . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Sawtooth: synchronization and frequency adjust . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Input RMS current of two synchronized regulators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
OVP not latched . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
OVP latched . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
constant current protection at extreme duty cycles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
minimum TON. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Type III compensation network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Open loop gain: module bode diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Open loop gain bode diagram with ceramic output capacitor . . . . . . . . . . . . . . . . . . . . . . . 32
Type II compensation network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Open loop gain: module bode diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Open loop gain bode diagram with high ESR output capacitor . . . . . . . . . . . . . . . . . . . . . 35
Maximum continuos output current vs. duty cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Switching losses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Estimation of the internal power losses (VIN = 12 V, VOUT = 1.2 V, fSW = 400 kHz) . . . . . 38
Estimation of the internal power losses (VIN = 5 V, VOUT = 1.2 V, fSW = 400 kHz) . . . . . . 39
Measurement of the thermal impedance of the evaluation board. . . . . . . . . . . . . . . . . . . . 40
Top board layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Bottom board layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Demonstration board application circuit (fSW = 400 kHz) . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Demonstration board application circuit (fSW = 600 kHz) . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Junction temperature vs. fSW at VIN = 12 V, VOUT = 3.3 V . . . . . . . . . . . . . . . . . . . . . . . . . 45
Junction temperature vs. fSW at VIN = 5 V, VOUT = 3.3 V . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Junction temperature vs. fSW at VIN = 3.3 V, VOUT = 1.2 V . . . . . . . . . . . . . . . . . . . . . . . . 45
Junction temperature vs. VOUT at VIN = 12 V, fSW = 400 kHz . . . . . . . . . . . . . . . . . . . . . . 45
Junction temperature vs. VOUT at VIN = 5 V, fSW = 400 kHz . . . . . . . . . . . . . . . . . . . . . . . 46
Junction temperature vs. VOUT at VIN = 3.3 V, fSW = 400 kHz . . . . . . . . . . . . . . . . . . . . . . 46
Efficiency vs. output current at VIN = 3.3 V, fSW = 400 kHz . . . . . . . . . . . . . . . . . . . . . . . . 46
Efficiency vs. output current at VIN = 5 V, fSW = 250 kHz . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Efficiency vs. output current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Load regulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Line regulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Load transient from 0 to 3 A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Soft-start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
HTSSOP16 mechanical drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
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