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AIC1531
500mA Dual Linear Regulator with Internal Power Switch
n FEATURES
l l l l l
n DESCRIPTION
AIC1531 is a dual input regulator with VAUX switch capable of delivering 3.3V/500mA continuously. The output power is provided from three independent input voltage sources on a prioritized basis. Power is always taken in priority using the following order VCC, VSBY, and VAUX . The AIC1531 meets Intel's " Instantly Available " power requirements which follows the "Advanced Configuration and Power Interface" (ACPI)
Continuous 3.3V Output from Three Inputs. Complete Power Management Solution. VCC, VSBY Regulator Supplies 500mA Output. Built-in Hysteresis When Selecting Input Supplies. Integrated Switch has Very Low RDS(ON) 120m (typ.). Integrated Switch Supplies 500mA From VAUX . Output can be Forced Higher than Input (Off-State).
l l
n APPLICATIONS
l l l l l
Desktop Computers. PCI Adapter Cards with Wake-On-LAN. Network Interface Cards (NICs). Multi Power System. System with Standby Capabilities.
standards. When either V CC or V SBY is present, the device automatically enables the regulator and produces a stable 3.3V output VOUT . When only VAUX (3.3V) is present, the device provides a low impedance direct connection (120m typ.) from VAUX to VOUT . The AIC1531 also prevents excessive current from flowing V OUT to either input voltage or ground when the output voltage is higher than the input voltage. All the necessary control circuitry needed to provide a smooth and automatic transition between all the three supplies has been incorporated. This allows both V CC and V SBY to be dynamically switched without loss of output voltage.
Analog Integrations Corporation
4F, 9 Industry E. 9th Rd, Science-Based Industrial Park, Hsinchu, Taiwan TEL: 886-3-5772500 FAX: 886-3-5772510 www.analog.com.tw
DS-1531-00 022502
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AIC1531
n TYPICAL APPLICATION CIRCUIT
1 VSBY_5V + C1 10 F VCC_5V + C2 10F VAUX_3.3V AIC1531 3 4 VOUT AUX 2 VSBY VCC 8 GND 7 GND 6 GND 5 GND + C3 10 F 3.3V/500mA
Dual Input Regulator with Auxiliary Power Switch
n ORDERING INFORMATION
AIC1531CXXX
PACKING TYPE TR: TAPE & REEL TB: TUBE PACKAGE TYPE N: PLASTIC DIP S: SMALL OUTLINE
PIN CONFIGURATION
DIP-8 SO-8 TOP VIEW VSBY 1 VCC 2 VOUT 3 AUX 4 8 GND 7 GND 6 GND 5 GND
Example: AIC1531CSTR a in SO-8 Package & Taping & Reel Packing Type (CN is not available in Tape & Reel packing type.)
n ABSOLUTE MAXIMUM RATINGS
VCC, VSBY Input Voltage ..................................................................................................7.0V VAUX Input Voltage ...........................................................................................................4.0V VOUT Output Voltage ........................................................................................................5.0V Operating Temperature Range ............................................................................... -40C~85C Storage Temperature Range...............................................................................-65C ~ 150C
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AIC1531
n ELECTRICAL CHARACTERISTICS (VIN= 5V, TA=25C, unless otherwise
specified.)
PARAMETERS Regulated Output Voltage Regulated Output Current VCC selected Output Voltage Load Regulation ILOAD=50mA ~ 500 mA VSBY selected ILOAD=50mA ~ 500mA Output Voltage Line Regulation VCC Select Voltage VCC Deselect Voltage VSBY Select Voltage VSBY Deselect Voltage Hysteresis Voltage Auxiliary Switch Resistance Short Circuit Current VCC Pin Reverse Leakage VSBY Pin Reverse Leakage AUX Pin Reverse Leakage VCC Supply Current (when VSBY is not present) VSBY Supply Current (when VCC is not present) VAUX Supply Current VCC , VSBY are deselected VCC/SBY=5V, VOUT =0V One supply input taken to ground while the others remain at nominal voltage VCC > VCCSEL , ILOAD=0mA VCCDES > VCC > VOUT VOUT > VCC VSBY > VCCSEL , ILOAD=0mA VSBYDES > VSBY > VOUT VOUT > VSBY VCC or VSBY > VOUT VCC and VSBY < VOUT Both VCC and VSBY are deselected Ground Current VCC/SBY=5V , ILOAD = 0mA VCC/SBY=5V , ILOAD = 500mA 70 50 10 70 50 10 10 50 60 100 100 300 200 20 300 200 20 100 400 300 500 500 A A A A 5 50 A VCC=4.5V~5.5V, ILOAD=5mA VSBY=4.5V~5.5V, ILOAD=5mA VSBY > VSBYDES or VAUX present VCC < VCCDES VAUX present VSBY< VSBYDES 3.90 3.90 2 4.50 4.20 4.50 4.20 0.30 120 1000 200 4.60 4.60 mV 20 mV CONDITIONS 0mA < ILOAD < 500mA MIN. 3.135 500 TYP. 3.300 MAX. 3.465 UNIT V mA
V
V V m mA
3
AIC1531
n TYPICAL PERFORMANCE CHARACTERISTICS
VCC
VC C
VOUT VOUT 500mA 500mA
Fig. 1 VCC Cold Start
Fig. 2 VC C Full Power Down
VSBY
VSBY
VOUT 500mA 500mA
VOUT
Fig 3. VSBY Cold Start
Fig. 4 VSBY Full Power Down.
VAUX
VAUX
VOUT 500mA
VOUT 500mA
Fig. 5 VAUX Cold Start
Fig. 6 VAUX Full Power Down.
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AIC1531
n TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
V SBY VSBY
VCC
VCC
VOUT 375mA
375mA
VOUT
Fig. 7
VCC Power Up ( VSBY =5V)
Fig. 8 VCC Power down ( VSBY =5V)
VCC
VCC
VOUT 375mA
VOUT 375mA
Fig. 9
V Power Up ( VAUX = 3.3V) CC
Fig. 10
VCC Power Down ( VAUX = 3.3V)
IOUT 5mA500mA
IOUT 500mA5mA
VOUT
VOUT
Fig. 11 VCC Load Transient Rising
Fig. 12
VCC Load Transient Falling
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AIC1531
n TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
VCC 4.5V5.5V VCC 5.5V4.5V
VOUT 5mA Loading
VOUT 5mA Loading
Fig. 13
3.40 3.35 3.30 3.25 3.20 3.15 3.10 3.05 3.0
VCC Line Transient Rising
3.400
Fig. 14
V C Line Transient Falling C
100mA
500mA
3.375 3.350
VOUT (V)
V OUT (V)
3.325 3.300 3.275 3.250 3.225 3.200 0 200 400 600 800
3.5
4.0
4.5
5.0
VCC (V)
Load Current (mA)
Fig. 11
180
V CC Line Regulation
3.280
Fig. 16 Load Regulation
160
3.275
Resistance (m)
140
3.270
V OUT (V)
120
3.265
100
3.260
80
3.255
60 2.7 3.0 3.3 3.6
3.250
-40
-20
0
20
40
60
80
100
V current LoadAUX (V)
Fig. 17 VAUX Switch Resistance vs. VAUX
Temperature (C) Fig. 18 Output Voltage vs. Temperature
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AIC1531
n BLOCK DIAGRAM
n PIN DESCRIPTION
PIN 1: VSBY - Standby supply voltage (5V) input for 3.3V regulator when VCC falls below VCCDES. Some NICs that operate in " Wake-On-LAN" mode get a 5V standby through a cable that connects directly to a specific header on the Motherboard. PIN 2: VCC - Primary supply voltage (5V) input for 3.3V regulator.
When only VAUX (3.3V) is present, VOUT voltage comes from VAUX through an internal low impedance switch. PIN 4: AUX PIN 5-8: GND - Auxiliary supply voltage (3.3V) input for low impedance switch. - Negative reference for all voltages.
PIN 3: VOUT - 3.3V regulated output voltage when either VCC or V SBY is present.
n APPLICATIONS INFORMATION
The Requirement for External Capacitors The selection of the output capacitor is based on two requirements: LDO compensation and the transition between power sources. During the takeover between sources, the output capacitor provides the loading. Therefore a larger output capacitor can improve the transition. And since the output capacitor plays the important role in the compensation of LDO, a 10F Tantalum capacitor or larger is recommended. The input capacitor is required to be as close to the The layout and Thermal Considerations The AIC1531 is housed in a thermally enhanced package where the GND pins (Pin5 to Pin8) are integrated to the leadframe. Generally, heat sinks are not available for most surface-mounted devices. IC as possible. The input capacitor can reduce the parasitic effect formed by the power supply output impedance or the trace. A 10F Tantalum capacitor is a good choice. Additional ceramic capacitor can be placed close to input and output to reduce the high frequency noise. A 0.1F is recommended.
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AIC1531
Instead, they rely on the printed-circuit board to provide the thermal path. When the AIC1531 operates normally, the maximum power dissipation is PD = (VIN - VOUT ) x IOUT = (5 - 3.3) x 0.5 = 0.85W
used thermal path. To make sure the thermal resistance small enough and the shutdown function work normally, the thermal resistance between GND pins to GND plane should be as small as possible by means of adding more vias. And the GND plane should be at least 1 square centimeters of copper. The layout of AIC1531 is shown in Fig.1. In Fig. 2, the thermal resistance RJA is 70.36C/W where the AIC1531 is mounted on the double-sided PCB and measured under the forced-air thermal chamber.
At the maximum operation temperature, the thermal resistance seen by the device, or the combination of all the thermal paths, should be 165 - 85 R JA < = 94 C/W . 0.85 When the device is mounted on a double-sided printed circuit board, the ground plane is the most
Fig.19 The layout of AIC1531
2.6 2.4
Power Dissipation (W)
2.2 2.0 1.8 1.6 1.4 1.2 1.0 0.8
0
20
40
60
80
100
Ambient Temperature (C)
Fig.20 The power thermal shutdown dissipation vs. ambient temperature where RJA is 70.36C/W in the forced-air thermal chamber
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AIC1531
The Application circuits
USB_5V C1 10F 22 H L1 VIN + R1 22 C4 22F C9 1F 27K R3 U1 1 2 3 4 ILIM/SD VIN SW SGND VOUT 7 LBI 6 LBO 5 CGND AIC1631 R6 12k R8 30K
+ +
D1 SS12 8
C11 +
Q1 si2301 U2 R7 51k 1 2 3 4 C13 10F VSBY VCC VOUT AUX GND GND GND GND 8 7
VOUT _3.3V
220F R5 15k
+
6 5
C5 47 F
AIC1531
Fig.21 The Step Up/Down converter with OR function for dual power system
22H L1 VIN
+
D1 SS12 U1
USB_5V + C4 10 F U2 1 8 2 3
+
R1 22 C1 22
27K R2
VOUT_3.3V GND 8 GND 7 GND 6 GND 5
+
C2 1
1 ILIM/SD VOUT 7 2 VIN LBI 6 3 SW LBO 5 4 SGND CGND AIC1631
VSBY VCC VOUT AUX
C3 220F
4
C5 47F
AIC1531
Fig.22 The Step Up converter with OR function for dual power system
USB_5V
+ C4 10 F U2
V OUT_3.3V
V IN 2.7~5.5V U1 1 VOUT C1 10 F 2 GND CAP 6 C3 10F C2 1 F
1 2 3 4 VIN 5 CAP 4
VSBY VCC VOUT AUX
GND GND GND GND
8 7
+
6 5
C5 22 F
3 SHDN
AIC1531
AIC1845
Fig. 23 The Step Up/Down converter with OR function for dual power system
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AIC1531
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
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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