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부품번호 | L6730B 기능 |
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기능 | (L6730 / L6730B) Adjustable step-down controller | ||
제조업체 | ST Microelectronics | ||
로고 | |||
전체 30 페이지수
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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www.st.com
52
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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4페이지 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 = 0.5⋅C(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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다운로드 | [ L6730B.PDF 데이터시트 ] |
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구매 문의 | 일반 IC 문의 : 샘플 및 소량 구매 ----------------------------------------------------------------------- IGBT, TR 모듈, SCR 및 다이오드 모듈을 포함한 광범위한 전력 반도체를 판매합니다. 전력 반도체 전문업체 상호 : 아이지 인터내셔날 사이트 방문 : [ 홈페이지 ] [ 블로그 1 ] [ 블로그 2 ] |
부품번호 | 상세설명 및 기능 | 제조사 |
L6730 | (L6730 / L6730B) Adjustable step-down controller | ST Microelectronics |
L6730B | (L6730 / L6730B) Adjustable step-down controller | ST Microelectronics |
DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |