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PDF PM6680 Data sheet ( Hoja de datos )
| Número de pieza | PM6680 | |
| Descripción | No Rsense dual step-down controller | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de PM6680 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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PM6680
No Rsense dual step-down controller with adjustable voltages
for notebook system power
Features
■ 6 V to 28 V input voltage range
www.DataSheet4U■.comAdjustable output voltages
■ 5V always voltage available deliver 100 mA
peak current
■ 1.237 V ± 1% reference voltage available
■ Lossless current sensing using low side
MOSFETs RDS(on)
■ Negative current limit
■ Soft-start internally fixed at 2ms
■ Soft output discharge
■ Latched OVP and UVP
■ Selectable pulse skipping at light loads
■ Selectable minimum frequency (33 kHz) in
pulse skip mode
■ 4mW maximum quiescent power
■ Independent power good signals
■ Output voltage ripple compensation
Applications
■ Notebook computers
■ Tablet PC or slates
■ Mobile system power supply
■ 3-4 cells Li+ battery powered devices
VFQFPN-32 5X5
Description
PM6680 is a dual step-down controller
specifically designed to provide extremely high
efficiency conversion, with lossless current
sensing technique. The constant on-time
architecture assures fast load transient response
and the embedded voltage feed-forward provides
nearly constant switching frequency operation. An
embedded integrator control loop compensates
the DC voltage error due to the output ripple.
Pulse skipping technique increases efficiency at
very light load. Moreover a minimum switching
frequency of 33kHz is selectable to avoid audio
noise issues. The PM6680 provides a selectable
switching frequency, allowing three different
values of switching frequencies for the two
switching sections. The output voltages OUT1
and OUT2 can be adjusted from 0.9 V to 5.5 V
and from 0.9 V to 3.3 V respectively.
Table 1. Device summary
Order codes
Package
PM6680
VFQFPN-32 5mm x 5mm (Exposed pad)
PM6680TR
VFQFPN-32 5mm x 5mm (Exposed pad)
Packaging
Tube
Tape and reel
August 2007
Rev 6
1/49
www.st.com
49
1 page  
PM6680
List of tables
List of tables
Table 1.
Table 2.
Table 3.
Table 4.
Table 5.
Table 6.
Table 7.
www.DataSheet4UT.caobmle 8.
Table 9.
Table 10.
Table 11.
Table 12.
Table 13.
Table 14.
Table 15.
Table 16.
Table 17.
Table 18.
Table 19.
Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Pin functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
FSEL pin selection: typical switching frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
V5SW multifunction pin. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Operatives modes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Protections and operatives modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Inductor manufacturer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Output capacitor manufacturer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Input capacitor manufacturer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
High side MOSFET manufacturer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Low side MOSFET manufacturer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Dual MOSFET manufacturer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Shottky diode manufacturer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
VFQFPN 5x5x1.0 32L Pitch 0.50 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Exposed pad variations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
5/49
5 Page 
PM6680
Pin settings
www.DataSheet4U.com
Table 4. Pin functions (continued)
N° Pin
Function
29
OUT1
Output voltage sense for the switching section 1.This pin must be directly
connected to the output voltage of the switching section.
30
COMP1
DC voltage error compensation pin for the switching section 1.
31
VCC
Device Supply Voltage pin. It supplies all the internal analog circuitry except
the gate drivers (see LDO5). Connect this pin to LDO5.
32
VREF
Internal 1.237V high accuracy voltage reference. It can deliver 50uA.
Bypass to SGND with a 100nF capacitor to reduce noise.
11/49
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet PM6680.PDF ] | |
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