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PDF AP2171D Data sheet ( Hoja de datos )
| Número de pieza | AP2171D | |
| Descripción | 1A SINGLE CHANNEL CURRENT-LIMITED POWER SWITCH | |
| Fabricantes | Diodes Incorporated | |
| Logotipo |  |
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AP2161D/AP2171Dwww.DataSheet4U.com
1A SINGLE CHANNEL CURRENT-LIMITED POWER
SWITCH WITH OUTPUT DISCHARGE
Description
Pin Assignments
The AP2161D and AP2171D are integrated high-side power
switches optimized for Universal Serial Bus (USB) and other
hot-swap applications. The family of devices complies with
USB 2.0 and available with both polarities of Enable input.
They offer current and thermal limiting and short circuit
protection as well as controlled rise time and under-voltage
lockout functionality. A 7ms deglitch capability on the open-
drain Flag output prevents false over-current reporting and
does not require any external components.
GND 1
( Top View )
8 NC
IN 2
7 OUT
IN 3
6 OUT
All devices are available in SOT25, SO-8, MSOP-8-EP, and
DFN2018-6 packages.
EN 4
SO-8
5 FLG
Features
• Single USB port power switches with output discharge
• Over-current and thermal protection
• 1.5A accurate current limiting
• Fast transient response
• Reverse Current Blocking
• 90mΩ on-resistance
• Input voltage range: 2.7V – 5.5V
• 0.6ms typical rise time
• Very low shutdown current: 1uA (max)
• Fault report (FLG) with blanking time (7ms typ)
• ESD protection: 4KV HBM, 300V MM
• Active high (AP2171D) or active low (AP2161D) enable
• Ambient temperature range -40ºC to 85°C
• SOT25, SO-8, MSOP-8-EP (Exposed Pad), and
DFN2018-6: Available in “Green” Molding Compound
(No Br, Sb)
• Lead Free Finish / RoHS Compliant (Note 1)
• UL Recognized, File Number E322375 (pending)
• IEC60950-1 CB Scheme Certified
Applications
• Consumer electronics – LCD TV & Monitor, Game
Machines
• Communications – Set-Top-Box, GPS, Smartphone
• Computing – Laptop, Desktop, Servers, Printers, Docking
Station, HUB
GND
IN
IN
EN
1
2
3
4
( Top View )
MSOP-8-EP
8 NC
7 OUT
6 OUT
5 FLG
( Top View )
OUT
GND
FLG
1
2
3
5 IN
4 EN
SOT25
( Top View )
GND 1
6 OUT
IN 2
5 OUT
EN 3
4 FLG
DFN2018-6
Notes: 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at
http://www.diodes.com/products/lead_free.html.
AP2161D/2171D
Document number: DS32250 Rev. 1 - 2
1 of 18
www.diodes.com
June 2010
© Diodes Incorporated
1 page  
AP2161D/AP2171Dwww.DataSheet4U.com
1A SINGLE CHANNEL CURRENT-LIMITED POWER
SWITCH WITH OUTPUT DISCHARGE
Typical Performance Characteristics
VEN
VOUT
50%
50%
TR
TD(ON)
90%
10%
TD(OFF)
TF
90%
10%
VEN
VOUT
50%
50%
TR
TD(ON)
90%
10%
TD(OFF)
TF
90%
10%
Figure 1. Voltage Waveforms: AP2161D (left), AP2171D (right)
All Enable Plots are for AP2171D Active High
Turn-On Delay and Rise Time
Turn-Off Delay and Fall Time
Ven
5V/div
Vout
2V/div
Ven
5V/div
CL=1uF
TA=25°C
RL=10Ω
Vout
2V/div
CL=1uF
TA=25°C
RL=10Ω
100us/div
Turn-On Delay and Rise Time
100us/div
Turn-Off Delay and Fall Time
Ven
5V/div
Vout
2V/div
Ven
5V/div
CL=120uF
TA=25°C
RL=10Ω
Vout
2V/div
CL=120uF
TA=25°C
RL=10Ω
500us/div
500us/div
AP2161D/2171D
Document number: DS32250 Rev. 1 - 2
5 of 18
www.diodes.com
June 2010
© Diodes Incorporated
5 Page 
AP2161D/AP2171Dwww.DataSheet4U.com
1A SINGLE CHANNEL CURRENT-LIMITED POWER
SWITCH WITH OUTPUT DISCHARGE
Application Note (Continued)
Thermal Protection
Thermal protection prevents the IC from damage when the die temperature exceeds safe margins. This mainly
occurs when heavy-overload or short-circuit faults are present for extended periods of time. The
AP2161D/AP2171D implements a thermal sensing to monitor the operating junction temperature of the power
distribution switch. Once the die temperature rises to approximately 140°C, the Thermal protection feature gets
activated as follows: The internal thermal sense circuitry turns the power switch off and the FLG output is asserted
thus preventing the power switch from damage. Hysteresis in the thermal sense circuit allows the device to cool
down to approximately 25°C before the output is turned back on. This built-in thermal hysteresis feature is an
excellent feature, as it avoids undesirable oscillations of the thermal protection circuit. The switch continues to
cycle in this manner until the load fault is removed, resulting in a pulsed output. The FLG open-drain output is
asserted when an over-current occurs with 7-ms deglitch.
Reverse Current Protection
In a normal MOSFET switch, current can flow in reverse direction (from the output side to the input side) when the
output side voltage is higher than the input side, even when the switch is turned off. A reverse-current blocking
feature is implemented in the AP21x1 series to prevent such back currents. This circuit is activated by the
difference between the output voltage and the input voltage. When the switch is disabled, this feature blocks
reverse current flow from the output back to the input.
Special Functions:
Discharge Function
When enable is de-asserted, the discharge function is active. The output capacitor is discharged through an
internal NMOS that has a discharge resistance of 100Ω. Hence, the output voltage drops down to zero. The time
taken for discharge is dependent on the RC time constant of the resistance and the output capacitor.
FLG Response
The FLG open-drain output goes active low for any of the two conditions: Over-Current or Over-Temperature. The
time from when a fault condition is encountered to when the FLG output goes low is 7-ms (TYP). The FLG output
remains low until both over-current and over-temperature conditions are removed. Connecting a heavy capacitive
load to the output of the device can cause a momentary Over-current condition, which does not trigger the FLG
due to the 7-ms deglitch timeout. This 7-ms timeout is also applicable for Over-current recovery and Thermal
recovery. The AP2161D/AP2171D is designed to eliminate erroneous Over-current reporting without the need for
external components, such as an RC delay network.
Applications Information:
Power Supply Considerations
A 0.01-μF to 0.1-μF X7R or X5R ceramic bypass capacitor between IN and GND, close to the device, is
recommended. This limits the input voltage drop during line transients. Placing a high-value electrolytic capacitor
on the input (10-μF minimum) and output pin(s) is recommended when the output load is heavy. This precaution
also reduces power-supply transients that may cause ringing on the input. Additionally, bypassing the output with
a 0.01-μF to 0.1-μF ceramic capacitor improves the immunity of the device to short-circuit transients. This
capacitor also prevents output from going negative during turn-off due to inductive parasitics.
AP2161D/2171D
Document number: DS32250 Rev. 1 - 2
11 of 18
www.diodes.com
June 2010
© Diodes Incorporated
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet AP2171D.PDF ] | |
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