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st2051のメーカーはSTMicroelectronicsです、この部品の機能は「Enhanced power switch」です。 |
部品番号 | st2051 |
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部品説明 | Enhanced power switch | ||
メーカ | STMicroelectronics | ||
ロゴ | |||
このページの下部にプレビューとst2051ダウンロード(pdfファイル)リンクがあります。 Total 11 pages
ST2051
Enhanced power switch
Features
■ 90mΩ high-side MOSFET switch
■ 500mA continuos current per channel
■ Thermal and short-circuit protection with
overcurrent logic output
www.Data■SheOept4eUr.actoinmg range from 2.7V to 5.5V
■ CMOS- and TTL-compatible enable inputs
■ 2.5ms typical rise time
■ Under voltage lock out
■ 10µA Maximum standby supply current
■ Ambient temperature range, 0°C to 85°C
■ 2kV ESD protection
■ Fault-blanking
Description
The ST2051 power distribution switch is intended
for applications where heavy capacitive loads and
short circuits are likely to be encountered. These
devices incorporate 90mΩ N-channel MOSFET
high-side power switches for power-distribution.
The switch is controlled by a logic enable input.
Gate drive is provided by an internal charge pump
designed to control the power-switch rise times
and fall times to minimize current surges during
switching. The charge pump requires no external
components and allows operation from supplies
as low as 2.7V.
SO-8
When the output load exceeds the current-limit
threshold or a short is present, the device limits
the output current to a safe level by switching into
a constant-current mode, pulling the overcurrent
logic output low. When continuous heavy
overloads and short circuits increase the power
dissipation in the switch, causing the junction
temperature to rise, a thermal protection circuit
shuts off the switch to prevent damage. Recovery
from a thermal shutdown is automatic once the
device has cooled sufficiently. Internal circuitry
ensures the switch remains off until valid input
voltage is present.
Order codes
Part number
ST2051BDR
August 2006
Package
SO-8
Rev1
Packaging
Tape and reel
1/11
www.st.com
11
1 Page ST2051
Schematic diagram and pin connections
1 Schematic diagram and pin connections
Figure 1. Schematic diagram
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Figure 2. Pin connections (top view)
Table 1.
Pin
1
2
3
4
5
6
7
8
Pin functions
Name
Type
GND
IN1
IN2
EN
OC
OUT3
OUT2
OUT1
-
-
-
I
O
-
-
-
Description
Ground
VCC input, 2.7-5.5V
VCC input, 2.7-5.5V
Enable (Active Hi)
Open drain output for fault indication
Output
Output
Output
3/11
3Pages Electrical characteristics
4 Electrical characteristics
ST2051
Table 4.
Symbol
Electrical characteristics (TJ = 25°C, VI = 5.0V)
Parameter
Test conditions
VI = 3.3V; -40 < TJ < 125°C
Static Drain-Source
RDS(on) ON-State Resistance
VI = 5.0V; -40 < TJ < 125°C
VI = 3.3V; TJ = 25°C
VI = 5.0V; TJ = 25°C
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tr
tf
Output rise time (1)
Output fall time (1)
TON
TOFF
Turn-ON time (1)
Turn-OFF time (1)
VI = 5.5V, RL = 10Ω, CL = 1µF
VI = 2.7V, RL = 10Ω, CL = 1µF
VI = 5.5V, RL = 10Ω, CL = 1µF
VI = 2.7V, RL = 10Ω, CL = 1µF
RL = 10Ω, CL = 100µF
RL = 10Ω, CL = 100µF
1. Not tested in production, specified by design
Min.
Typ. Max.
100 145
90 135
90 130
80 110
2.5
3
0.3
0.2
20
40
Unit
mΩ
ms
ms
ms
ms
ms
ms
Table 5.
Symbol
Current limit characteristics
(VI = 5.5V, IO = rated current, TJ = 25°C, unless otherwise specified.)
Parameter
Test conditions
Min. Typ. Max.
Unit
IOS
Short circuit output
current
VI = 5V, OUT Connected to
GND, device enabled into
short circuit
0.7 1.0 1.3 A
Table 6.
Symbol
Supply current characteristics
(VI = 5.5V, IO = rated current, TJ = 25°C, unless otherwise specified.)
Parameter
Test conditions
Min. Typ. Max.
IOFF Switch turned OFF
ION Switch turned ON
Ileakage Output leakage current
No load
No load; -40 < TJ < 125°C
No load
No load; -40 < TJ < 125°C
Output grounded, switch is
OFF
Output grounded, switch is
OFF; -40 < TJ < 125°C
1.0 5.0
10
70 90
100
10
20
Unit
µA
µA
µA
µA
µA
µA
6/11
6 Page | |||
ページ | 合計 : 11 ページ | ||
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部品番号 | 部品説明 | メーカ |
st2051 | Enhanced power switch | STMicroelectronics |
ST2052 | CURRENT LIMITED POWER DISTRIBUTION SWITCHES | ST Microelectronics |
ST2054 | CURRENT LIMITED POWER DISTRIBUTION SWITCHES | ST Microelectronics |