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부품번호 | L6728H 기능 |
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기능 | Single-phase Switching DC-DC Controllers & Smart Regulators | ||
제조업체 | ST Microelectronics | ||
로고 | |||
전체 30 페이지수
www.DataSheet4U.com
L6728H
Single phase PWM controller with Power Good
Features
■ Flexible power supply from 5 V to 12 V
■ Power conversion input as low as 1.5 V
■ 0.8 V internal reference
■ 0.8% output voltage accuracy
■ High-current integrated drivers
■ Power Good output
■ Sensorless and programmable OCP across
low-side RDS(on)
■ OV / UV protections
■ VSEN disconnection protection
■ Oscillator internally fixed at 300 kHz
■ LSless to manage pre-bias start-up
■ Adjustable output voltage
■ Disable function
■ Internal soft-start
■ DFN10 package
Applications
■ Memory and termination supply
■ Subsystem power supply (MCH, IOCH, PCI...)
■ CPU and DSP power supply
■ Distributed power supply
■ General DC-DC converters
DFN10
Description
L6728H is a single-phase step-down controller
with integrated high-current drivers that provides
complete control logic and protection to realize in
a simple way general DC-DC converters by using
a compact DFN10 package.
Device flexibility allows managing conversions
with power input VIN as low as 1.5 V and device
supply voltage ranging from 5 V to 12 V.
L6728H provides simple control loop with voltage
mode EA. The integrated 0.8 V reference allows
regulating output voltages with ±0.8% accuracy
over line and temperature variations. Oscillator is
internally fixed to 300 kHz.
L6728H provides programmable dual level over
current protection as well as over and under
voltage protection. Current information is
monitored across the low-side MOSFET RDS(on)
saving the use of expensive and space-
consuming sense resistors.
PGOOD output easily provides real-time
information on output voltage status, through
VSEN dedicated output monitor.
Table 1.
Device summary
Order codes
L6728H
L6728HTR
Package
DFN10
Packaging
Tube
Tape and reel
May 2009
Doc ID 15725 Rev 1
1/32
www.st.com
32
www.DataSThyepeti4cUa.cl oampplication circuit and block diagram
1 Typical application circuit and block diagram
L6728H
1.1
Application circuit
Figure 1. Typical application circuit
VCC = 5V to 12V
CDEC
PGOOD
CF
CP RF
ROS
RPG
10
6
VCC
PGOOD
BOOT
1
7
COMP
/ DIS
3
UGATE
2
PHASE
L6728H
4
8 LGATE
FB / OC
VSEN GND
RFB
9
5 ROCSET
VIN = 1.5V to 12V
CHF
HS
L
LS
CBULK
Vout
COUT
LOAD
1.2
ROS
L6728AH Reference Schematic
RFB
Block diagram
Figure 2. Block diagram
VSEN
VOUT MONITOR
PGOOD
CONTROL LOGIC
&
PROTECTIONS
OC
CLOCK
600 kHz
OSCILLATOR
L6772288AH
PWM
ERROR AMPLIFIER
+
-
0.8V
VOCTH
HS
VCC
LS
IOCSET
BOOT
UGATE
PHASE
LGATE
/ OC
GND
4/32 Doc ID 15725 Rev 1
4페이지 www.DataSLh6e7et248UH.com
4 Electrical specifications
4.1
Absolute maximum ratings
Table 4. Absolute maximum ratings
Symbol
Parameter
VCC
to GND
VBOOT, VUGATE
to PHASE
to GND
to GND; t < 200 ns
VPHASE
to GND
to GND; t < 200 ns
VLGATE
to GND
FB, COMP, VSEN to GND
PGOOD to GND
Electrical specifications
Value
-0.3 to 15
15
33
45
-5 to 18
-8 to 30
-0.3 to VCC+0.3
-0.3 to 3.6
-0.3 to VCC+0.3
Unit
V
V
V
V
V
V
4.2 Electrical characteristics
VCC = 5 V to 12 V; TJ = 0 to 70 °C unless otherwise specified
Table 5. Electrical characteristics
Symbol
Parameter
Test conditions
Min. Typ. Max. Unit
Supply current and power-ON
ICC
IBOOT
UVLO
VCC supply current
BOOT supply current
VCC Turn-ON
Hysteresis
UGATE and LGATE = OPEN
UGATE = OPEN; PHASE to GND
VCC rising
6 mA
0.7 mA
4.1 V
0.2 V
Oscillator
FSW
ΔVOSC
dMAX
Main oscillator accuracy
PWM ramp amplitude
Maximum duty cycle
Reference and error amplifier
270 300 330 kHz
1.4 V
80 %
A0
GBWP
SR
DIS
Output voltage accuracy
DC gain (1)
Gain-bandwidth product (1)
Slew-rate (1)
Disable threshold
COMP falling
-0.8 - 0.8 %
120 dB
15 MHz
8 V/μs
0.70 0.85 V
Doc ID 15725 Rev 1
7/32
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부품번호 | 상세설명 및 기능 | 제조사 |
L6728 | Single phase PWM controller | STMicroelectronics |
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DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |