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参数资料
| 型号： | LX1673-09CPWTR |
| 厂商： | MICROSEMI CORP-ANALOG MIXED SIGNAL GROUP |
| 元件分类： | 稳压器 |
| 英文描述： | 1 A SWITCHING CONTROLLER, 1035 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封装： | PLASTIC, TSSOP-20 |
| 文件页数： | 7/13页 |
| 文件大小： | 259K |
| 代理商： | LX1673-09CPWTR |
Microsemi
Linfinity Microelectronics Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 3
Copyright
2000
Rev 0.4a, 5/25/2004
WWW
.Microse
m
i
.CO
M
LX1673
High Frequency PWM Regulator
PRELIMINARY DATA SHEET
TM
FUNCTIONAL PIN DESCRIPTION
NAME
DESCRIPTION
EA-
Voltage Feedback – Output voltage is connected through a resistor network to this pin for feedback to set the
desired output voltage of the switching PWM output.
EAO
Error Amplifier Output – Sets error amplifier gain and external compensation if used.
EA+
Voltage Reference – Connect to the SS pin or any other external voltage. Used in conjunction with EA-, and an
external resistor divider, to set the desired output voltage for the PWM output.
VCC
IC supply voltage (nominal 5V).
VCCL
Power supply pin for Low side drivers.
LDFB
Low Dropout Regulator Voltage Feedback – Sets output voltage of external MOSFET via resistor network.
CS
Over-Current Limit Set – Connecting a resistor between CS pin and the source of the high-side MOSFET sets the
current-limit threshold for the PWM output. A minimum of
1K
must be in series with this pin.
SS
PWM Soft-start/Hiccup Capacitor Pin – During start-up, the voltage on this pin controls the output voltage of the
switching regulator. An internal
20K
resistor and the external capacitor set the time constant for soft-start
function. The Soft-start function does not initialize until the supply voltage on VCC exceeds the UVLO threshold.
When an over-current condition occurs, this capacitor is used for the timing of hiccup mode protection.
AGND
Analog ground reference.
DGND
Digital ground reference.
LDGD
Low Dropout Regulator Gate Drive – Connect to gate of external N-Channel MOSFET for linear regulator
function.
PGND
MOSFET Driver Power Ground. Connects to the source of the bottom N-channel MOSFETS of the switching
regulator.
TDRV
High Side MOSFET Gate Driver
BDRV
Low Side MOSFET Gate Driver
VC1
High-Side MOSFET Gate Driver Supply – Connect to separate supply or boot strap supply to ensure proper high-
side gate driver supply voltage.
LDDIS
LDO Disable Input – High disables LDO output. This pin has a
100K
pull down resistor.
VS
Voltage reference for Short Circuit Current sense. This pin is also the supply pin for the Current Sense
Comparator. This pin cannot be left floating, if current limit is not used connect to VCC.
PWGD
Power Good Output – Open drain output, goes high at end of Soft Start and no Fault. Pulls low if any Fault
condition occurs.
LDVCC
LDO VCC Supply – Connect to voltage supply greater than supply rail for LDO MOSFET drain.
DIS
PWM Disable Input –High disables the PWM output. This pin has a
80K
pull down resistor.
PP
AA
CC
KK
AA
GG
EE
DD
AA
TT
AA
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