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LX1684CD Datasheet

  • LX1684CD

  • Voltage-Mode PWM Controller

  • 12頁

  • MICROSEMI

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LX1684
L I N F I N I T Y
D I V I S I O N
Voltage-Mode PWM Controller
P
RODUCTION
DESCRIPTION
KEY FEATURES
W W W.
Microsemi
.COM
The LX1684 is a monolithic, voltage-
mode pulse-width modulator controller.
It is designed to implement a flexible,
low cost buck (step-down) regulator
supply with a minimal of external
components.
The LX1684 has a synchronous
driver for higher efficiency and is
optimized to provide 12V to 3.3V or
12V to 2.5V regulation. It also can be
used to convert 5V or 3.3V to voltages
as low as 1.25V.
Switching frequency is fixed at
175kHz for optimal cost and space.
Short-circuit current limiting can be
implemented without expensive current
sense resistors.
Similar to the LX1682 in function but
with the positive side of the current
sense comparator brought out (CSP) to
allow it to be referenced to the topside
FET.
Current is sensed using the voltage
drop across the R
DS(ON)
of the MOSFET
this sensing is delayed for 1碌s to
eliminate MOSFET ringing errors.
Hiccup-mode fault protection reduces
average power to the power elements
during short-circuit conditions.
Under-voltage lockout and soft-start
are provided for optimal start-up
performance. Pulling the soft-start pin to
ground can disable the LX1684.
The small 14-pin SOIC packaging,
combined with low profile, low ESR
capacitors, and TO-252 packaged FETs
results in a high efficiency converter in a
small board area. In most cases PCB
copper can accomplish necessary heat
sinking and no bulky additional heat
sinks are required.
If a low profile design is not required
small electrolytic capacitors can be used
reducing the overall converter cost.
!
Fixed 175kHz Switching
Frequency
!
Constant Frequency Voltage-
Mode Control Requires No
External Compensation
!
Hiccup-Mode Over-Current
Protection
!
High Efficiency
!
Output Voltage Set By
Resistor Divider
!
Under-Voltage Lockout
!
Soft-Start And Enable
!
Synchronous Rectification
!
Small, 14-pin Surface Mount
Package
APPLICATIONS
!
12V to 3.3V Or Less Buck
Regulators
!
3.3/5V to 2.5V Or Less Buck
Regulators
!
Hard Disk Drives
!
Computer Add-on Cards
IMPORTANT:
For the most current data, consult
MICROSEMI鈥檚
website:
http://www.microsemi.com
PRODUCT HIGHLIGHT - TYPICAL 12V TO 3.3V APPLICATION
5V
5%
R1
165 Ohm
1
12V
10%
12V
C5
1碌F
2
3
4
C1
0.1碌F
D1
5817SMT
Q1
SUB45N
05-20L
3x
820碌F,
16V
C4
FB
NC
SS
CSP
GND
PGND
BDR
VCC
NC
CS
NC
VC1
NC
TDR
14
13
LM78L05
or equivalent
5V
TO
VCC
R2
100 Ohm
Css
0.1碌F
RSET
12
3.3K
11
10
9
8
5
6
7
Optional 12V only circuit
L1 is a powdered
iron toroid
Q2
SUB45N05-
20L
L1
10碌H
4x
1500碌F
6.3V
VOUT
3.3V
10A
C3
LX1684
LX1684
PACKAGE ORDER INFO
T
A
(擄C)
擄
0 to 70
Copyright
錚?/div>
2000
Rev. 1.0, 2001-09-19
O
UTPUT
Synchronous
D
Plastic SOIC
14-PIN
LX1684CD
Note: Available in Tape & Reel.
Append the letter 鈥淭鈥?to the part number. (i.e. LX1684CDT)
Microsemi
Linfinity Microelectronics Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1

LX1684CD 產(chǎn)品屬性

  • 2,500

  • 集成電路 (IC)

  • PMIC - 穩(wěn)壓器 - DC DC 切換控制器

  • -

  • 電壓模式

  • 1

  • 200kHz

  • -

  • 5V

  • 是

  • 無

  • 無

  • 無

  • 無

  • 無

  • 無

  • 無

  • 0°C ~ 70°C

  • 14-SOIC（0.154"，3.90mm 寬）

  • -

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