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PDF L6730 Data sheet ( Hoja de datos )
| Número de pieza | L6730 | |
| Descripción | (L6730 / L6730B) Adjustable step-down controller | |
| Fabricantes | ST Microelectronics | |
| Logotipo |  |
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L6730
L6730B
Adjustable step-down controller with synchronous rectification
Features
■ Input voltage range from 1.8V to 14V
■ Supply voltage range from 4.5V to 14V
■ Adjustable output voltage down to 0.6V with
±0.8% accuracy over line voltage and
temperature (0°C~125°C)
■ Fixed frequency voltage mode control
■ tON lower than 100ns
■ 0% to 100% duty cycle
■ Selectable 0.6V or 1.2V internal voltage
reference
■ External input voltage reference
■ Soft-start and inhibit
■ High current embedded drivers
■ Predictive anti-crossconduction control
■ Selectable uvlo threshold (5V or 12V BUS)
■ Programmable high-side and low-side RDS(on)
sense over-current-protection
■ Switching frequency programmable from
100kHz to 1MHz
■ Master/slave synchronization with 180° phase
shift
■ Pre-bias start up capability (L6730)
■ Selectable source/sink or source only
capability after soft-start (L6730)
■ Selectable constant current or hiccup mode
overcurrent protection after soft-start (L6730B)
HTSSOP20
■ Power good output with programmable delay
■ Over voltage protection with selectable
latched/not-latched mode
■ Thermal shut-down
■ Package: HTSSOP20
Applications
■ High performance / high density DC-DC
modules
■ Low voltage distributed DC-DC
■ niPOL converters
■ DDR memory supply
■ DDR memory bus termination supply
Order Codes
Part number
L6730
L6730TR
L6730B
L6730BTR
June 2006
Package
HTSSOP20
HTSSOP20
HTSSOP20
HTSSOP20
Rev 2
Packing
Tube
Tape & Reel
Tube
Tape & Reel
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www.st.com
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1 page  
L6730 - L6730B
1.1 Functional description
Figure 1. Block diagram
VCC=4.5V to14V
OCL PGOOD OCH
VCCDR
SS/INH
SYNCH
OSC
EAREF
PGOOD
SINK/OVP/UVLO*
TMASK
Monitor
Protection
and Ref
LDO
OSC
L6730/B
+ 0.6V
- 1.2V
MASKING TIME
ADJUSTMENT
-
+ PWM
E/A
+-
FB
BOOT
HGATE
PHASE
LGATE
PGND
GND
COMP
Summary description
Vin=1.8V to14V
Vo
1. In the L6730B the multifunction pin is: CC/OVP/UVLO.
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5 Page 
L6730 - L6730B
Table 4. Electrical characteristics
Symbol
Parameter
Test Condition
Error Amplifier
REAREF
IFB
Ext Ref
Clamp
VOFFSET
GV
GBWP
EAREF Input Resistance
I.I. bias current
Error amplifier offset
Open Loop Voltage Gain
Gain-Bandwidth Product
SR Slew-Rate
Vs. GND
VFΒ = 0V
Vref = 0.6V
Guaranteed by design
Guaranteed by design
COMP = 10pF
Guaranteed by design
Gate Drivers
RHGATE_ON High Side Source Resistance
RHGATE_OFF High Side Sink Resistance
RLGATE_ON Low Side Source Resistance
RLGATE_OFF Low Side Sink Resistance
VBOOT - VPHASE = 5V
VBOOT - VPHASE = 5V
VCCDR = 5V
VCCDR = 5V
Protections
IOCH
IOCL
OCH Current Source
OCL Current Source
OVP
Over Voltage Trip
(VFB / VEAREF)
IOSC
OSC Sourcing Current
VOCH = 1.7V
VFB Rising
VEAREF = 0.6V
VFB Falling
VEAREF = 0.6V
VFB > OVP Trip VOSC = 3V
Power Good
VPGOOD
Upper Threshold
(VFB / VEAREF)
Lower Threshold
(VFB / VEAREF)
PGOOD Voltage Low
VFB Rising
VFB Falling
IPGOOD = -5mA
Electrical characteristics
Min. Typ. Max. Unit
70 100 150
0.290 0.5
kΩ
µA
2.3 V
-5 +5 mV
100 dB
10 MHz
5 V/µs
1.7 Ω
1.12 Ω
1.15 Ω
0.6 Ω
90 100 110 µΑ
90 100 110 µΑ
120 %
117 %
30 mA
108 110 112 %
88 90 92
0.5
%
V
11/52
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet L6730.PDF ] | |
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