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參數(shù)資料
| 型號(hào)： | L5988 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | 4A step-down switching regulator with synchronous rectification |
| 中文描述： | 第4A降壓型開關(guān)穩(wěn)壓器采用同步整流 |
| 文件頁(yè)數(shù)： | 4/10頁(yè) |
| 文件大?。?/td> | 103K |
| 代理商： | L5988 |
Pin connections and functions
L5988
4/10
2
Pin connections and functions
Figure 1.
Pin connection ( Top view)
Table 1.
N
o
Pin
Pin functions
Name
Description
2,3,4
V
CC
V
OUT
GND
Unregulated DC input voltage.
1,16
Regulator output.
13,14,15
Ground.
9
SYNCH
It is a Master-Slave pin. Two or more devices can be synchronized by simply connecting the
SYNCH pins together. The device operating with the highest FSW will be the Master. The
Slave devices will operate with 180° phase shift from the Master.
10
FSW
Connecting an external resistor from this pin to GND, the external frequency can be increased
up to 1 MHz. Connecting an external resistor from this pin to VREF (1.8V), the switching
frequency can be decreased down to 200 KHz. If the pin is left open, the default switching
frequency is 400 KHz. The pin voltage is 1.2V. In OVP the pin is pulled up to 3.3V (only in
latched mode).
8
FB
This pin is connected to the error amplifier inverting input. Connect it to the output resistor
divider (if used) or directly to Vout. This pin is also used to sense the output voltage in order to
manage the over voltage condition.
6
COMP
This pin is connected to the error amplifier output and is used to compensate the voltage
control feedback loop.
5
SS/INH
The soft-start time is programmed connecting an external capacitor from this pin and GND.
The internal current generator forces a current of 22
μ
A through the capacitor. When the
voltage at this pin is lower than 0.65V the device is disabled.
12
V
REF
Internally regulated voltage of 1.8V. It is used to provide a voltage reference for the
multifunction pin. Filter this pin to ground with at least 1
μ
F ceramic cap.
Connecting a resistor between this pin and GND it is possible to increase the over current
protection threshold.
Connecting a resistor between this pin and V
REF
it is possible to
decrease the over current protection threshold.
7
ILIM-ADJ
11
S/O/U
Multifunction pin. Depending on the voltage level at the input, with this pin it is possible:
– to enable-disable the sink mode current capability after soft-start;
– to enable-disable the latch mode for the OVP;
– to set the UVLO threshold for the 3.3V BUS and 12V BUS. (2.4V and 8V respectively);
The device continuously checks the analog value present at this pin and sets the
function according with the measured voltage.
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
VOUT
VCC
VCC
VCC
SS/INH
COMP
ILIM-ADJ
FB
SYNCH
FSW
OUS
VREF
GND
GND
GND
VOUT
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| L5988D | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 STEP DOWN SWITCH REG RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| L5988DTR | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 4A Step Down Reg 2.9V to 18V 200ns RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| L5989D | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 4A cont 5A pulsed step-down sw RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| L5989DTR | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 4A cont 5A pulsed step-down sw RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| L5991 | 功能描述:電流型 PWM 控制器 Prog Current Mode RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
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