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AIC1525
USB High-Side Power Switch
n FEATURES
l l l l l l
n DESCRIPTION
The AIC1525 is an integrated high-side power switch for self-powered and bus-powered Universal Serial Bus (USB) applications. The high-side switch is a MOSFET with 70m RDS(ON), which meets USB voltage drop requirements for maximum transmission wire length.
l
l l l l
70m (5V Input) High-Side MOSFET Switch. 500mA Continuous Load Current per Channel. 75A Typical On-State Supply Current. 1A Typical Off-State Supply Current. Current-Limit / Short Circuit Protection. Thermal Shutdown Protection under Overcurrent Condition. Undervoltage Lockout Ensures that Switch is off at Start Up. Output can be Forced Higher than Input (Off-State). Open-Drain Fault Flag. Slow Turn ON and Fast Turn OFF. Enable Active-High or Active-Low.
Multi-purpose open-drain fault flag output indicates over-current limiting, thermal shutdown, or undervoltage lockout. Output current is typically limited to 0.85A below the 5A safety requirement, and thermal shutdown function shuts the switch off to prevent damage under overcurrent condition.
n APPLICATIONS
* USB Power Management.
l l
Hot Plug-In Power Supplies. Battery-Charger Circuit.
n TYPICAL APPLICATION
CIRCUIT
VCC 5.0V 33 F 4.50 V to 5.25V Upstream VBUS 100mA max VBUS D+ DGND + 1F C IN 10K
Guaranteed minimum output rise time limits inrush current during hot plug-in, minimizing EMI and preventing the voltage at upstream port from dropping excessively.
AI C17 2 2
IN OUT
USB Controll er
VIN ON/OFF OVERCURRENT GND CTL FLG GND NC OUT IN OUT IN 0.1 F + 33 F
Ferrite Bead VBUS D+ DGND
+
GND
10 F C OUT
0.01 F
*
AIC1525 DATA
*
33 F, 16V Tantalum, or 100F, 10V Electrolytic Bold line indicate high- current traces
DATA
One-Port Self-Powered Hub
Analog Integrations Corporation www.analog.com.tw DS-1525-00 May 16, 00 TEL: 886-3-5772500
4F, 9, Industry E. 9th Rd, Science Based Industrial Park, Hsinchu Taiwan, ROC FAX: 886-3-5772510
1
AIC1525
n ORDERING INFORMATION
AIC1525-XXX
PACKAGE TYPE N: PLASTIC DIP S: SMALL OUTLINE TEMPERATURE RANGE C: 0 C~70C
ORDER NUMBER
AIC1525-0CN AIC1525-1CN (PLASTIC DIP) AIC1525-0CS AIC1525-1CS (PLASTIC SO)
PIN CONFIGURATION
TOP VIEW CTL FLG GND NC 1 2 3 4 8 OUT 7 IN 6 OUT 5 IN
CONTROL POLARITY 0: ACTIVE LOW 1: ACTIVE HIGH
n ABSOLUTE MAXIMUM RATINGS
Supply Voltage (V IN) .......................................................... ... ... ... .......... ... ........... 7.0V Fault Flag Voltage (V FLG) ........................................................... ... ... ... ... ... ..... ... ...... 7.0V Fault Flag Current (IFLG) ...................... ... ... ........................ ... ... .................. ........ 50mA
Control Input (V CTL) ......................................................... ... ... ... ... ....... ... ..... . -0.3V ~15V Operating Temperature Range Storage Temperature Range ................. ... ... ... ..... ... ... ... ... .... ............... -20C~80C ....................................... ... ... .................. -65C ~ 150C
n TEST CIRCUIT
10K VCC +5V ON CTL OFF FLG OUT IN OUT IN AIC1525 0.1F
10
GND NC
2
AIC1525
n ELECTRICAL CHARACTERISTICS (V
specified.) PARAMETERS
Supply Current Control Input Voltage
IN=
5V, Ta=25C, unless otherwise
CONDITIONS
VCTL =Logic "0" , OUT=Open VCTL =Logic "1" , OUT=Open VCTL =Logic "0" VCTL =Logic "1"
MIN.
TYP.
0.75 75 1.7
MAX.
5 100 0.8
UNIT
A
V
2.4
2.0 0.01 0.01 1 70 100 1 1 pF m S 4000 20 20 10 S S S A A C 25 40 1 A V A
Control Input Current
VCTL =Logic "0" VCTL =Logic "1"
Control Input Capacitance Output MOSFET Resistance Output Turn-On Rise Delay Output Turn-On Rise Time Output Turn-Off Delay Output Turn-Off Fall Time Output Leakage Current Current Limit Threshold Overtemperature Shutdown Threshold Error Flag Output Resistance Error Flag Off Current UVLO Threshold TJ Increasing TJ Decreasing VIN = 5V , IL =10 mA VIN = 3.3V , IL =10mA VFLG = 5V VIN Increasing VIN Decreasing 0.7 RL = 10 each Output RL = 10 each Output RL = 10 each Output RL = 10 each Output
100 1000 0.8 0.7
1.0 135 125 10 15 0.01 2.6 2.4
1.25
3
AIC1525
n BLOCK DIAGRAM
OUT FLG POWER N-MOSFET
DRIVER
CTL CHARGE PUMP CURRENT LIMIT CS
GND
THERMAL SHUTDOWN
UVLO
IN
n TYPICAL
70
PERFORMANCE CHARACTERISTICS
Output ON Resistance vs. Supply Voltage
Switch-ON Resistance (m)
69
68 67 66 65 64
2
3
Supply Voltage (V)
4
5
6
7
On-Resistance vs. Temperature
90
ON Resistance (m )
80
70
60
50 -60 -40 -20 0 20 40 60 80 100 120
Temperature ( C)
4
AIC1525
ON-State Supply Current vs. Supply Voltage
2.8 100
UVLO Threshold Voltage vs. Temperature
Switch-ON Supply Current (A)
UVLO Threshold Voltage (V)
2.7
90
2.6 2.5
rising
80
70
2.4 2.3 2.2
falling
60
50
2
3
4
5
6
7
-40
-20
0
Supply Voltage (V)
Temperature (C)
20
40
60
80
100
120
n TYPICAL
95 90 85 80 75 70 65 60
PERFORMANCE CHARACTERISTICS (Continued)
OFF-State Supply Current vs. Temperature
10
1
ON-State Supply Current vs. Temperature
Supply Current (A)
-40 -20 0 20 40 60 80 100 120
Supply Current (A)
10
2
10
3
Temperature ( C)
10
4
-40
-20
0
Temperature (C)
20
40
60
80
100
120
OFF State Current vs. Supply Voltage
0.10
CTL Threshold Voltage vs. Supply Voltage
2.8 2.6
0.08
2.4
Supply current (A)
Threshold voltage (V)
2.2 2.0 1.8 1.6 1.4 1.2 1.0
CTL rising CTL falling
0.06
0.04
0.02
0 3 4 5 6 7 8
0.8 2 3 4 5 6 7
Supply Voltage (V)
Supply Voltage (V)
5
AIC1525
Output Rise Time vs. Temperature
1.40
0.54 0.52
Output fall Time vs. Temperature
Turn-ON Resistance (mS)
1.35
Turn-Off Fall Time (S)
-40 -20 0 20 40 60 80 100 120
1.30 1.25 1.20 1.15 1.10 1.05
0.50 0.48 0.46 0.44 0.42 0.40 0.38 -40 -20 0 20 40 60 80 100 120
Temperature (C)
Temperature ( C)
6
AIC1525
TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
Current Limit Threshold vs. Temperature
1.15
Output Threshold (A)
1.00
0.95
Current Limit Threshold
0.90
Short Circuit Current Limit
0.85 -60 -40 -20 0 20 40 60 80 100 120 140
Temperature (C)
Short Circuit Response
Current Limit Response
FLG
0.8A
FLG
Thermal Shutdown IOUT 1A/10mV
IOUT 1A/10mV
Turn-On/Off Characteristic ( I )
Turn On/Off Characteristic (II)
CTL
VOUT
IOUT
OUT
1A/10mV
R=10
RL=35 CL=100 F
7
AIC1525
n PIN DESCRIPTION
PIN 1: CTL - TTL compatible control input. It controls the power switch turnon/turn-off. Active High for AIC1525-1 and active low for AIC1525-0. - An active-low and open-drain fault flag output for power switch. It can indicate current limit if CTL is PIN 3: GND PIN 4: NC PIN 5, 7: IN
active. In normal mode operation, it also can indicate thermal shutdown or undervoltage. - Chip power ground. - Not internally connected. - Power supply Input.
PIN 2: FLG
PIN 6, 8: OUT - MOSFET switch output.
n APPLICATION INFORMATIONS
l Error Flag
An open-drained output of an N-channel MOSFET, the FLG output is pulled low to signal the following fault conditions: input undervoltage, output current limit, and thermal shutdown. control supply transients. Without a bypass capacitor, an output short may cause sufficient ringing on the input (from supply lead inductance) to damage internal control circuitry.
l Transient Droop Requirements
l Current Limit
The current limit threshold is preset internally. It protects the output MOSFET switches from damage due to undesirable short circuit conditions or excess inrush current often encountered during hot plug-in. The low limit of the current limit threshold of the AIC1525 allows a minimum current of 0.5A through the MOSFET switches. A current limit condition will signal the error flag.
USB support dynamic attachment (hot plug-in) of peripherals. A current surge is caused by the input capacitance of downstream device. Ferrite beads are recommended in series with all power and ground connector pins. Ferrite beads reduce EMI and limit the inrush current during hot-attachment by filtering high-frequency signals.
l Short Circuit Transient
Bulk capacitance provides the short-term transient current needed during a hot-attachment event. With a 33F, 16V tantalum or 100F, 10V electrolytic capacitor mounted close to downstream connector should provide transient drop protection.
l Thermal Shutdown
When the chip temperature exceeds 135C, the thermal shutdown function turns off MOSFET switch and signals the error flag. A hysteresis of 10C prevents the MOSFET from turning back on until the chip temperature drops to below 125C.
l Printed Circuit Layout
The power circuitry of USB printed circuit boards requires a customized layout to maximize thermal dissipation and to minimize voltage drop and EMI.
l Supply Filtering
A 0.1F to 1F bypass capacitor from IN to GND, located near the device, is strongly recommended to
8
AIC1525
VCC 5.0V 33uF 4.50 V to 5.25V Upstream VBUS 100mA max VBUS D+ DGND + 1F C IN 10K AIC1722 IN OUT Ferrite Bead CTL FLG GND NC OUT IN OUT IN 0.1 F DATA + 33 F 0.01 F VBUS D+ DGND
USB Controll er
VIN ON/OFF OVERCURRENT GND
+
GND
10 F C OUT
*
AIC1525 DATA
*
33 F, 16V Tantalum, or 100F, 10V Electrolytic Bold line indicate high- current traces
One-Port Self-Powered Hub
n PHYSICAL DIMENSIONS
l 8 LEAD PLASTIC SO (unit: mm)
D
SYMBOL A
H E
MIN 1.35 0.10 0.33 0.19 4.80 3.80
MAX 1.75 0.25 0.51 0.25 5.00 4.00 1.27(TYP)
A1 B C
e A C A1
D E e H
L
5.80 0.40
6.20 1.27
B
L
9
AIC1525
l 8 LEAD PLASTIC DIP (unit: mm)
D
SYMBOL A1
E1
MIN 0.381 2.92 0.35 0.20 9.01 7.62 6.09
MAX -- 4.96 0.56 0.36 10.16 8.26 7.12
A2 b
E
C D E
C
A2 A1
L
E1
eB b e
e eB L --
2.54 (TYP) 10.92 3.81
2.92
10

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