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參數(shù)資料
| 型號： | L4985D |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Voltage-Mode SMPS Controller |
| 中文描述： | 電壓模式開關(guān)電源控制器 |
| 文件頁數(shù)： | 4/23頁 |
| 文件大小： | 415K |
| 代理商： | L4985D |
PIN FUNCTIONS
N.
1
2
3
4
Name
Function
RESET OUT
DIS 2
DIS 1
OUT
SGND
Open drain reset output. The output ishigh when the stepdown output voltage is nominal
A signal (active low) disables only the auxiliary DC-DC converter.
A signal (active low) disables the device (sleep mode operation)
Stepdown regulatoroutput
Signal Ground
5, 6,
15, 16
7
8
9
10
11
12
13
14
V
DD
Regulated step-up output. This output can deliver also 1mA for external function.
Step-up open drain, to be connected to the chip inductor.
Synchronous gate driver for external power MOS
Power ground
Auxiliary output, open drain converter for boost or flyback / forwardtopologies
Feedback of the auxiliary DC-DC converter
E/A output to be used for frequency compensation
Soft starttime constant. A capacitor connected between this pin and ground determinates
the soft start time.
Input supply voltage
An external capacitor connected between this pin and ground fixes the switching
frequency.
Stepdown feedback input . It is directly connected to the output for 1.28V; a voltage
divider is requested for higher output voltages.
Connecting a capacitor between this terminal and ground,a delay time reset is fixed.
LBOOST
GTDR
PWGND
AUX OUT
VFB AUX
COMP
SS
17
18
V
S
OSC
19
VFB
20
RESET DELAY
ELECTRICALCHARACTERISTICS
(V
17
= 12V; T
j
= 25
°
C; C
osc
= 560pF;unlessotherwisespecified.)
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
DYNAMICCHARACTERISTICS
V
I
Input Voltage Range
V
O
Output Voltage Range
f
SW
Switching Frequency
V
19
Feedback Voltage
V
L
Line and Load Regulation on
Feedback Voltage
V
17
- V
4
Dropout Voltage
I
O
= 3A; V
O
= V
REF
I
O
= 3A; V
S
= 18V
4.5
V
REF
73
1.254
1.242
20
16
93
V
V
83
1.28
1.28
KHz
V
V
I
O
= 0.5A
V
17
= 5 to 18V; I
O
= 0.5 to 3A;
V
O
= V
REF
I
O
= 3A
I
O
= 3A 0 < T
j
< 125
°
C
V
O
= 5V; I
O
= 3A
DIS 2 = LOW; DIS 1 = HIGH
V
17
= 8 to 18V; V
O
= 5V
V
17
= 5 to 18V
1.306
1.318
0.3
0.45
85
0.4
0.6
V
V
%
n
Efficiency
I
4
Max Limiting Current
Voltage Stability of Switching
Frequency
Temperature Stability of
Switching Frequency
3.75
4.25
1
4.75
2
A
%
δ
f
SW
/
δ
V
S
δ
f
SW
/
δ
T
j
T
j
= 0 to 70
°
C
4
6
%
GTDR GATEDRIVER OUTPUT
V
9
Output Low Level
I
SINK
= 10mA
I
SINK
= 30mA
I
SOURCE
= 3mA
I
SOURCE
= 10mA
C
L
= 1nF
C
L
= 1nF
0.26
1
10
9.5
70
70
0.5
2
V
V
V
V
ns
ns
V
9
Output High Level
8.3
8.3
t
r
t
f
Rise Time
Fall Ttime
100
100
L4985
4/23
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| L4987 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:VERY LOW DROP VOLTAGE REGULATORS WITH INHIBIT AND DROPOUT CONTROL FLAG |
| L4987CPT120 | 功能描述:IC REG LDO 12V .2A P-PAK RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 穩(wěn)壓器拓?fù)浣Y(jié)構(gòu):正，固定式 輸出電壓:3.1V 輸入電壓:最高 5.5V 電壓 - 壓降（標(biāo)準(zhǔn)）:- 穩(wěn)壓器數(shù)量:1 電流 - 輸出:300mA 電流 - 限制（最小）:420mA 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-5 細(xì)型，TSOT-23-5 供應(yīng)商設(shè)備封裝:TSOT-23-5 包裝:帶卷 (TR) |
| L4987CPT30 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:VERY LOW DROP VOLTAGE REGULATORS WITH INHIBIT AND DROPOUT CONTROL FLAG |
| L4987CPT33 | 功能描述:IC REG LDO 3.3V .2A P-PAK RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 穩(wěn)壓器拓?fù)浣Y(jié)構(gòu):正，固定式 輸出電壓:3.1V 輸入電壓:最高 5.5V 電壓 - 壓降（標(biāo)準(zhǔn)）:- 穩(wěn)壓器數(shù)量:1 電流 - 輸出:300mA 電流 - 限制（最?。?420mA 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-5 細(xì)型，TSOT-23-5 供應(yīng)商設(shè)備封裝:TSOT-23-5 包裝:帶卷 (TR) |
| L4987CPT33TR | 功能描述:IC REG LDO 3.3V .2A P-PAK RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 穩(wěn)壓器拓?fù)浣Y(jié)構(gòu):正，固定式 輸出電壓:3.1V 輸入電壓:最高 5.5V 電壓 - 壓降（標(biāo)準(zhǔn)）:- 穩(wěn)壓器數(shù)量:1 電流 - 輸出:300mA 電流 - 限制（最?。?420mA 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-5 細(xì)型，TSOT-23-5 供應(yīng)商設(shè)備封裝:TSOT-23-5 包裝:帶卷 (TR) |
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