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L6730B 데이터시트 PDF




ST Microelectronics에서 제조한 전자 부품 L6730B은 전자 산업 및 응용 분야에서
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부품번호 L6730B 기능
기능 (L6730 / L6730B) Adjustable step-down controller
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L6730B 데이터시트, 핀배열, 회로
www.DataSheet4U.com
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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L6730B pdf, 반도체, 판매, 대치품
Summary description
1 Summary description
L6730 - L6730B
The controller is an integrated circuit ... designed using BiCMOS-DMOS, v5 (BCD5) technology
that provides complete control logic and protection for high performance, step-down DC/DC
and niPOL converters.
It is designed to drive N-Channel MOSFETs in a synchronous rectified buck converter topology.
The output voltage of the converter can be precisely regulated down to 600mV, with a
maximum tolerance of ±0.8%, or to 1.2V, when one of the internal references is used. It is also
possible to use an external reference from 0V to 2.5V.
The input voltage can range from 1.8V to 14V, while the supply voltage can range from 4.5V to
14V. High peak current gate drivers provide for fast switching to the external power section and
the output current can be in excess of 20A, depending on the number of the external MOSFETs
used. The PWM duty cycle can range from 0% to 100% with a minimum on-time (TON(MIN))
lower than 100ns, making conversions with a very low duty cycle and very high switching
frequency possible.
The device provides voltage-mode control. It includes a 400kHz free-running oscillator that is
adjustable from 100kHz to 1MHz. The error amplifier features a 10MHz gain-bandwidth-product
and 5V/µs slew-rate that permits to realize high converter bandwidth for fast transient response.
The device monitors the current by using the RDS(ON) of both the high-side and low-side
MOSFET(s), eliminating the need for a current sensing resistor and guaranteeing an effective
over current-protection in all the application conditions. When necessary, two different current
limit protections can be externally set through two external resistors. A leading edge adjustable
blanking time is also available to avoid false over-current-protection (OCP) intervention in every
application condition.
It is possible to select the HICCUP mode or the constant current protection (L6730B) after the
soft-start phase.
During this phase constant current protection is provided. It is possible to select the sink-source
or the source-only mode capability (before the device powers on) by acting on a multifunction
pin (L6730). The L6730 disables the sink mode capability during the soft-start in order to allow
a proper start-up also in pre-biased output voltage conditions. The L6730B can always sink
current and, so it can be used to supply the DDR Memory BUS termination. Other features
include Master-Slave synchronization (with 180° phase shift), Power-Good with adjustable
delay, over voltage-protection, feed back disconnection, selectable UVLO threshold (5V and
12V Bus), and thermal shutdown. The HTSSOP20 package allows the realization for very
compact DC/DC converters.
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L6730B 전자부품, 판매, 대치품
L6730 - L6730B
3 Pin connections and functions
Pin connections and functions
Figure 2. Pins connection (Top view)
PGOOD DELAY
SYNCH
SINK/OVP/UVLO
TMASK
GND
FB
COMP
SS/INH
EAREF
OSC
1 20
2 19
3 18
4 17
5 16
6 15
7 14
8 13
9 12
10 11
HTSSOP20
PGOOD
VCC
VCCDR
LGATE
PGND
BOOT
HGATE
PHASE
OCH
OCL
1. In the L6730B the multifunction pin is: CC/OVP/UVLO.
Table 3. Pins connection
Pin n.
Name
Description
A capacitor connected between this pin and GND introduces a delay between
the internal PGOOD comparator trigger and the external signal rising edge. No
delay can be introduced on the falling edge of the PGOOD signal. The delay
1
PGOOD DELAY
can be calculated with the following formula:
PGDelay = 0.5C(pF ) [ µs]
Two or more devices can be synchronized by connecting the SYNCH pins
together. The device operating with the highest FSW will be the Master device.
2
SYNCH
The Slave devices will operate at 180° phase shift from the Master. The best
way to synchronize devices is to set their FSW at the same value. If it is not
used, the SYNCH pin can be left floating.
With this pin it is possible:
SINK/OVP/UVLO
– To enable-disable the sink mode current capability after SS (L6730);
L6730
– To enable-disable the constant current OCP after SS (L6730B);
3 – To enable-disable the latch mode for the OVP;
CC/OVP/UVLO
– To set the UVLO threshold for the 5V BUS and 12V BUS.
L6730B
The device captures the analog value present at this pin at the start-up when
VCC meets the UVLO threshold.
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관련 데이터시트

부품번호상세설명 및 기능제조사
L6730

(L6730 / L6730B) Adjustable step-down controller

ST Microelectronics
ST Microelectronics
L6730B

(L6730 / L6730B) Adjustable step-down controller

ST Microelectronics
ST Microelectronics

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