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A2525 PDF 데이터시트 : 부품 기능 및 핀배열

부품번호 A2525
기능 USB POWER CONTROL SWITCHES
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A2525 데이터시트, 핀배열, 회로
2525 AND
2535
USB POWER CONTROL SWITCHES
A2525EM
The A2525EL/M and A2535EL/M are integrated high-side power
switches, optimized for self-powered and bus-powered Universal Serial
Bus (USB) applications. Few external components are necessary to
EN 1
8 OUT satisfy USB requirements. The A2525EL/EM ENABLE inputs are
FLG 2
7 IN
active high; the A2535EL/EM are active low.
All devices are ideally suited for USB applications. Each switch
GND 3
NC 6 NC
channel supplies up to 500 mA as required by USB peripheral devices.
NC 4 NC
NC 5 NC
YDwg. PP-070A
RNote that the A2525EM (DIP) and the
OA2525EL (SOIC) are electrically identical and
Tshare a common terminal number assignment.
FACABSOLUTE MAXIMUM RATINGS
Supply Voltage, VIN ..................... 6.0 V
TOutput Voltage, VOUT .................. 6.0 V
COutput Current,
IOUT ................. Internally Limited
AENABLE Voltage Range,
VEN ......................... –0.3 V to 10 V
TFault Flag Voltage, VFLG .............. 8.0 V
NFault Flag Current, IFLG ............. 50 mA
Package Power Dissipation,
OPD ................................. See Graph
Operating Temperature Range,
CTA .......................... -40°C to +85°C
In addition, the switch’s low on-resistance permits achieving the USB
voltage-drop requirements. Fault current is limited to typically
750 mA, satisfying the UL 25 VA safety requirements, and a flag
output is available to indicate a fault condition to the local USB
controller. Momentary voltage drops that may occur on the upstream
port when the switch is enabled in bus-powered applications is elimi-
nated by a “soft start” feature.
Additional features include thermal shutdown to prevent catastrophic
switch failure from high-current loads, undervoltage lockout to ensure
that the device remains OFF unless there is a valid input voltage
present, and 3.3 V and 5 V logic-compatible enable inputs.
These switches are provided in 8-pin mini-DIP (suffix ‘M’) and
8-lead SOIC (suffix ‘L’) packages.
Features
I 2.7 V to 5.8 V Input
I Up to 500 mA Continuous Load Current per Port
I 140 mMaximum ON-Resistance
I 1.25 A Maximum Short-Circuit Current Limit
I Individual Open-Drain Fault Flag Outputs
I 100 µA Typical ON-State Supply Current
I <1 µA Typical OFF-State Supply Current
I Outputs Can be Forced Higher Than Input (off-state)
I Thermal Shutdown
I 2.2 V Typical Undervoltage Lockout
I 0.6 ms Turn On (soft-start) and Fast Turn Off
Junction Temperature, TJ ....... +150°C*
Storage Temperature Range,
I A2525 (active-high) Improved Replacement for MIC2525-1
I A2535 (active-low) Improved Replacement for MIC2525-2
TS ........................... -65°C to 150°C
Applications
* Fault conditions that produce excessive
junction temperature will activate device
thermal shutdown circuitry. These conditions
can be tolerated but should be avoided.
I USB Hosts and Self-Powered Hubs
I USB Bus-Powered Hubs
I Hot Plug-In Power Supplies
I Battery-Charger Circuits




A2525 pdf, 반도체, 판매, 대치품
2525 AND 2535
USB
POWER CONTROL
SWITCHES
FUNCTIONAL DESCRIPTION
Power switch
The power switch is an N-channel MOSFET with a maximum
on-state resistance of 140 m(VIN = 5 V). Configured as a
high-side switch, the power switch prevents current flow in
either direction if disabled. The drain body diode is discon-
nected from the source when the switch is OFF allowing the
output voltage to exceed the input voltage without causing
current conduction. The power switch supplies a minimum of
500 mA per switch.
Charge pump
An internal charge pump supplies power to the driver circuit
and provides the necessary voltage to pull the gate of the
MOSFET above the source. The charge pump operates from
input voltages as low as 2.7 V. The charge pump is limited to
2.5 µA to establish a controlled turn on time of typically 1 ms.
Driver
The driver controls the gate voltage of the power switch. To
limit large current surges and reduce the associated electromag-
netic interference (EMI) produced, the driver incorporates
circuitry that controls the rise times and fall times of the output
voltage. The rise time is typically 1 ms.
ENABLE (EN or EN)
The logic enable disables the power switch and the bias for the
charge pump, driver, and other circuitry to reduce the supply
current to less than 5 µA maximum when a logic high is present
on EN (A2525) or a logic low is present (A2535). The proper
logic level restores bias to the drive and control circuits and
turns the power ON. The enable input is a compatible with both
TTL and CMOS logic levels.
Fault Flag (FLG)
This open drain output is asserted (active low) when an
overcurrent or over temperature condition is encountered. The
output will remain asserted until the overcurrent or over
temperature condition is removed.
Current sense
A sense FET monitors the current supplied to the load. The
sense FET measures current more efficiently than conventional
resistance methods. When an overload or short circuit is
encountered, the current-sense circuitry sends a control signal to
the driver. The driver in turn reduces the gate voltage and
drives the power FET into its saturation region, which switches
the output into a constant-current mode and holds the current
constant while varying the voltage on the load.
Thermal sense
An internal thermal-sense circuit shuts off the power switch
when the junction temperature rises to approximately 165°C.
Hysteresis is built into the thermal sense circuit. After the
device has cooled approximately 10°C, the switch turns back
ON. The switch continues to cycle off and on until the fault is
removed.
Undervoltage lockout
A voltage-sense circuit monitors the input voltage. When the
input voltage is approximately 2 V, a control signal turns OFF
the power switch.
115 Northeast Cutoff, Box 15036
4 Worcester, Massachusetts 01615-0036 (508) 853-5000

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A2525 전자부품, 판매, 대치품
2525 AND 2535
USB
POWER CONTROL
SWITCHES
OUTPUT SHORT-CIRCUIT PERFORMANCE
VFAULT
VOUT
VFAULT
VOUT
IOUT
4 A/
15 m
SHORT CIRCUIT
5 ms/
IOUT
4 A/
2 µs/
15 m
SHORT CIRCUIT
VFAULT
IOUT
400 mA/
500 ms/
VFAULT
THERMAL SHUTDOWN
15 m
SHORT CIRCUIT
www.allegromicro.com
THERMAL
SHUTDOWN
IOUT
1 A/
500 ms/
RL = 15 m
7

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