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PDF L5988D Data sheet ( Hoja de datos )
| Número de pieza | L5988D | |
| Descripción | 4A continuous (more than 5 A pulsed) step-down switching regulator | |
| Fabricantes | ST Microelectronics | |
| Logotipo |  |
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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
List of figures
Figure 1.
Figure 2.
Figure 3.
Figure 4.
Figure 5.
Figure 6.
Figure 7.
Figure 8.
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Figure 24.
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Figure 30.
Figure 31.
Figure 32.
Figure 33.
Figure 34.
Figure 35.
Figure 36.
Figure 37.
Figure 38.
Figure 39.
Figure 40.
Figure 41.
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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Electrical characteristics
Table 4. Electrical characteristic (continued)
Symbol
Parameter
Test condition
Min Typ Max Unit
- UVLO 3.3 V bus
TH4 - OVP latched
- Sink
- UVLO 12 V bus
TH5 - OVP not latched
- No sink
- UVLO 12 V bus
TH6 - OVP not latched
- Sink
- UVLO 12 V bus
TH7 - OVP latched
- No sink
- UVLO 12 V bus
TH8 - OVP latched
- Sink
(3) 0.71
(3) 0.93
(3) 1.16
(3) 1.385
(3) 1.615
0.875 V
1.085 V
1.31 V
1.525 V
VREF V
1. Specification over the junction temperature range (TJ) of -40 to +125 °C are guaranteed by design,
characterization and statistical correlation
2. Guaranteed by design
3. VCC = 4 V
11/53
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| Páginas | Total 53 Páginas | |
| PDF Descargar | [ Datasheet L5988D.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
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