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Low Dropout High Performance Adjustable Positive Voltage Regulator
POWER MANAGEMENT Description
The SC1592 is a 3A low dropout high performance linear voltage regulator, that provides a low voltage, high current output with a minimum of external components, utilizing dual supply configuration. The SC1592 offers a wide input voltage range from 1.25V to 16V and is ideal for applications that need to convert down to 0.8V. Additionally, the SC1592 is fully protected with an externally programmable current limit, and thermal shutdown. Also, there is an EN input which enables or shuts down the device. The SC1592 voltage regulator is available in 7-lead DDPAK and SOIC-8L EDP packages.
SC1592
Features
Wide input range, VIN = 1.25V to 16V, VCNTL = 3V to 16V 3A Guaranteed Output Current 260mV (typ) @ 3A dropout voltage in dual supply mode 1% Initial Accuracy Adjustable output voltage, down to 0.8V Programmable current limiting and thermal shutdown Fast transient response Excellent line and load regulation Power SO-8 and 7-lead DDPAK
Applications
Low voltage logic supplies Microprocessor and chipset supplies Split plane microprocessor supplies Advanced graphics cards supplies Sound cards and auxiliary power supplies SMPS post regulator
Typical Application Circuit
+3.3V Vcntl
C1 1uF
CNTL
OUT
+1.8V Vout
R2 66.5 C3 47uF(cer)
SC1592
IN EN GND SENSE ILIM
+2.5V Vin
C2 10uF
R3 53
VOUT = (1 + VREF
R2 ) * VREF R3 = 0.8 V typ.
TTL
R1 100
Revision: January 27, 2004
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SC1592
POWER MANAGEMENT Absolute Maximum Ratings
Exceeding the specifications below may result in permanent damage to the device, or device malfunction. Operation outside of the parameters specified in the Electrical Characteristics section is not implied.
Parameter Power Input Voltage Control Input Voltage Output Current Power Dissipation Thermal Resistance Junction to Ambient DDPAK (1sq. in.) SOIC-8L EDP (1sq. in.) Thermal Resistance Junction to Case DDPAK SOIC-8L EDP Junction Temperature Range Storage Temperature Range Lead Temperature (Soldering) 10 Sec. ESD Rating (Human Body Model)
Symbol VIN VCNTL IOUT PD J A
Maximum 18 18 5 Internally Limited 29 36.5 3 5.5 -40 to +125 -65 to +150 300 2
Units V V A W C/W
J C TJ TSTG TLEAD ESD
C/W C C C kV
Electrical Characteristics
Unless specified: VIN = 2.5V, VEN = VCNTL = 3.3V, VOUT = 1.8V, IOUT = 10mA, RLIM = 100, TJ = TA = 25C. Values in bold indicate -40C < TJ < +125C.
Parameter Control Voltage Reference Voltage Control Pin Current
Symbol VCNTL VREF ICNTL_EN
Test Conditions VOUT = VREF VOUT = VREF VCNTL = VIN = VEN = 16V VOUT = VREF; IO = 0 VCNTL = VIN = VEN = 16V VOUT = VREF; IO = 3A
Min 3 792
Typ
Max 16
Units V mV mA
800 3 24 1 0.01 0.1 0.8 1.4 160 260
808 8
Control Pin Current in Shutdown VIN Line Regulation VCNTL Line Regulation Load Regulation (1)
ICNTL_DIS REG(LINE) REG(CNTL) REG(LOAD)
VCNTL = VIN = 16V V EN = 0 2.5V VIN 16V 3.3V VCNTL 16V, VOUT = VREF 10mA IOUT 2A, TJ = 25C 10mA IOUT 3A, -40 < TJ < 125C
5 0.1 0.4 1.5 3 320 520
A %/V %/V % % mV
Dropout Voltage
V DO
IOUT = 2A; VOUT = 0.98 Vnom IOUT = 3A; VOUT = 0.98 Vnom
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SC1592
POWER MANAGEMENT Electrical Characteristics (Cont.)
Unless specified: VIN = 2.5V, VEN = VCNTL = 3.3V, VOUT = 1.8V, IOUT = 10mA, RLIM = 100, TJ = TA = 25C. Values in bold indicate -40C < TJ < +125C.
Parameter Thermal Shutdown Thermal Shutdown Hysteresis SENSE Input Current Low Level EN High Level EN EN Input Current EN Impedance Current Limit Accuracy(2)
Symbol TSHUT
Test Conditions
Min
Typ 150 10 1
Max
Units C C A
0.8 2 VEN = VCNTL = 5V 55 65 ILIM -20 +20 100
V V A K %
Notes: (1) For load regulation use a 1ms current pulse width, d.c. 10% when measuring VOUT. (2) Current limit is programmable, ILIM
240 * VOUT RLIM
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SC1592
POWER MANAGEMENT Pin Configurations
Top View TAB
Pin Function 1 2 3 4 5 6 7 TAB ILIM IN CNTL GND OUT SENSE EN GND
Ordering Information
Part Number SC1592IMTR SC1592ISTR SC1592EVB(2) P ackag e
(1)
Temp. Range (TJ) -40C to +125C
TO-263-7L SOIC-8L EDP
Evaluation Board
Notes: (1) Only available in tape and reel packaging. A reel contains 800 devices for TO-263 package and 2500 devices for SOIC package. (2) When ordering Evaluation Board please specify package needed (TO-263(DDPAK) or SOIC(EDP)).
(TO-263-7L DDPAK)
Top View
ILIM IN IN CNTL 1 2 3 4 8 7 6 5 EN SENSE OUT OUT EN SENSE OUT OUT
Bottom View
8 7 6 5
Exposed Die Pad
GND ILIM IN IN CNTL
1 2 3 4
(SOIC-8L EDP)
(SOIC-8L EDP)
Pin Descriptions
Pin # DDPAK 1 2 3 Pin # SOIC 1 2, 3 4 Pin Name ILIM IN CNTL Pin Function Externally programmable current limit should be set at < 5A. This is the collector input to the power device. The ouput load current is supplied through this pin. This pin is the bias supply for the control circuitry. The current flow into this pin will be approximately 1% of the output current. For the device to regulate, the voltage on this pin must be at least 1.5V greater than the output voltage, but no less than VCNTL_MIN. Ground. This is the power output of the device. This is a feedback input. Enable input. When high, should be less or equal to VCNTL.
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4, TAB 5 6 7
PAD 5, 6 7 8
GND OUT SENSE EN
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SC1592
POWER MANAGEMENT Block Diagram
Figure 1
V RLIM 240 X OUT ILIM
ILIM = Selected current limit value VOUT = Regulated output voltage RLIM = Externally programmable current limit resistor. Accuracy of the current limit setting is better than 20% over full operating temperature range. *Internal ESD structure. In cases where EN is permanently tied to VIN, it's recommended that a 10-20k resistor should be inserted in the link between EN and VIN.
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SC1592
POWER MANAGEMENT Application Information
The SC1592 is a 3A low dropout high performance linear voltage regulator. The SC1592 can be used for voltage applications as low as 0.8V and is ideal for down conversion utilizing dual supply configuration. This allows for extremely low dropout voltages with excellent load and line regulation. The SC1592 can be utilized in high voltage applications, with VIN and VCNTL up to 16V, providing there is adequate thermal management. SC1592 is designed to meet stringent requirements of current generation microprocessors and other sensitive electronic devices. This is possible by employing an additional bias source, VCNTL. The voltage of this supply needs to be at least 1.5V greater than the output voltage in order to achieve low dropout, typically less then 300mV. Unlike most of the other high current linear regulators, the SC1592 provides a programmable current limit which can be set with a single resistor. The value of the programming resistor is:
ILIM 240 * VOUT RLIM
+3.3V Vcntl
CNTL
C1 2.2uF
+1.8V Vout
OUT
C3 100uF
SC1592
IN
10k
+2.5V Vin
C2 22uF
R2 66.5
SENSE GND ILIM
R3 53 R1 100
EN
VOUT = (1 + VREF
R2 ) * VREF R3 = 0.8 V typ.
Figure 2 The circuit in Figure 2 shows a typical application of 2.5V to 1.8V conversion with a 3.3V control supply and the load range of up to 3A steady state. Considering the approximate 2W power being dissipated by the pass element of the SC1592, we are still able to choose an SO-8 EDP package with TJA = 36.5C/W mount on the 1sq.in. copper pad allocated for adequate heat transfer. The ambient temperature in this case should not exceed 50C. If this temperature range is too restrictive, then the DDPAK can be utilized, having TJA = 29C/W mount on the same size copper pad. Input capacitor: A minimum of 10F ceramic capacitor is recommended to be placed directly next to the Vin pin. This allows for the device being some distance from any bulk capacitance on the rail. Additionally, bulk capacitance may be added closely to the input supply pin of the SC1592 to ensure that Vin does not sag, improving load transient response. Output capacitor: A minimum bulk capacitance of 33F, along with a 0.1F ceramic decoupling capacitor is recommended. Increasing the bulk capacitance will improve the overall transient response. The use of multiple lower value ceramic capacitors in parallel to achieve the desired bulk capacitance will not cause stability issues. Although designed for use with ceramic output capacitors, the SC1592 is extremely tolerant of output capacitor ESR values and thus will also work comfortably with tantalum output capacitors.
where ILIM = selected current limit value VOUT = regulated output voltage RLIM = programmable current limit resistor The SC1592 has a fast transient response that allows it to handle large load changes associated with high current applications. Proper selection of the of the output capacitor and it's ESR value determines stable operation and optimizes performance. The typical application shown in Figure 2 was tested with a wide range of different capacitors. The circuit was found to be unconditionally stable with capacitor values from 47F to 330F and ESR ranging from 0.5m to greater then 75m. It's recommended to maintain 5-10mA through the output divider network in order to have a tight load and line regulation. Initial accuracy of the internal voltage reference VREF = 0.8V 1% over full temperature range. This commands the use of 0.5% or better accuracy resistors to build a precision power supply.
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SC1592
POWER MANAGEMENT Typical Characteristics
Load Transient Reponse V OUT 20mV/div V IN = 2.5V
V OUT = 1.8V V CNTL = 3.3V
VIN
CIN
= 22uF
COUT = 100uF
I step : 1 5 m A to 3 A sl ew rate: 2 . A /uS 5
Iout
Time (2ms/div)
V OUT 20mV/div
V IN
= 2.5V
V OUT = 1.8V V CNTL = 3.3V CIN = 22uF
VIN
COUT = 100uF
Iout
I step : 1 5 m A to 3 A sl ew rate: 2 . A /uS 5
Time (200us/div)
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SC1592
POWER MANAGEMENT Typical Characteristics (Cont.)
Load Regulation 2.00 1.95 1.90 OUTPUT VOLTAGE(V) 1.85 1.80 1.75 1.70 1.65 1.60 1.55 1.50 0.0 0.5 1.0 1.5 2.0 2.5 3.0 OUTPUT CURRENT (A)
VCNTL = 3.3V VIN = 2.5V
2 1.95 1.9
OUTPUT VOLTAGE (V)
Output Voltage vs. Tem perature
1.85 1.8 1.75 1.7 1.65 1.6 1.55 1.5
-40
VCNTL = 3.3V VIN = 2.5V IOUT = 10mA
-20
0
20
40
60
80
100
120
TEMPERATURE (oC)
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SC1592
POWER MANAGEMENT Typical Characteristics (Cont.)
EnableThreshold vs. Temperature
2 1.8
OUTPUT VOLTAGE (V)
1.6 1.4 1.2 1 0.8 0.6 0.4 -40
VCNTL = 3.3V VIN = 2.5V VOUT = 1.8V IOUT = 10mA
-20
0
20
40
60
80
100
120
TEMPERATURE (oC)
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SC1592
POWER MANAGEMENT Typical Characteristics (Cont.)
Dropout Voltage (Control Supply) 1.1
DROPOUT VOLTAGE (V)
INITIAL VCNTL = 3.3V VIN = 2.5V VOUT = 1.8V
1.0
0.9
0.8 0 1 2 3 OUTPUT CURRENT (A)
Dropout Voltage (Input Supply) 0.50
0.40 DROPOUT VOLTAGE (V)
VCNTL = 3.3V INITIAL VIN = 2.5V VOUT = 1.8V
0.30
0.20
0.10
0.00 0 1 2 3 OUTPUT CURRENT (A)
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SC1592
POWER MANAGEMENT Typical Characteristics (Cont.)
Contol Current vs. Tem perature (In Shutdow n)
10000
CONTROL CURRENT (nA)
1000
100
V CNTL = 3.3V V IN = 2.5V V EN = 0V I OUT = 10mA
10
1 -40 -20 0 20 40 60 80 100 120
TEMPERATURE (oC)
Control Current vs Tem perature (In Regulation) 100
CONTROL CURRENT (mA)
IOUT = 3A IOUT = 2A 10
IOUT = 1A V CNTL = 3.3V V IN = 2.5V -20 0 20 40 60
o
1 -40
80
100
120
TEMPERATURE ( C)
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SC1592
POWER MANAGEMENT Typical Characteristics (Cont.)
1500 1400 DROPOUT VOLTAGE (mV) 1300 1200 1100 1000 900 800 700 600 500 -40
Dropout Voltage vs. Temperature (V CNTL - V OUT)
INITIAL VCNTL = 3.3V VIN = 2.5V VOUT = 1.8v IOUT = 3A
10
60
110
TEMPERATURE (oC)
Dropout Voltage vs. Tem perature (V IN - V OUT) 500 450 DROPOUT VOLTAGE (mV) 400 350 300 250 200 150 100 50 0 -40 -20 0 20 40 IOUT = 3A
VCNTL = 3.3V
IOUT = 2A
INITIAL VIN = 2.5V VOUT = 1.8v
60 80 100 120
TEMPERATURE (oC)
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SC1592
POWER MANAGEMENT Typical Characteristics (Cont.)
47uF ESR vs. Iout 10
1
Unstable Area
ESR (Ohm)
0.1
0.01
Stable Area
0.001 0 0.5 1 1.5 2 OUTPUT CURRENT (A) 2.5 3
150uF ESR vs. Iout 10
1
Unstable Area
ESR (Ohm)
0.1
0.01
Stable Area
0.001 0 0.5 1 1.5 2 OUTPUT CURRENT (A) 2.5 3
330uF ESR vs. Iout 10
1
Unstable Area
ESR (Ohm)
0.1
0.01
Stable Area
0.001 0 0.5 1 1.5 2 2.5 3 OUTPUT CURRENT (A)
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SC1592
POWER MANAGEMENT Evaluation Board Schematic
+3.3V Vcntl
CNTL
C1 2.2uF
+1.8V Vout
OUT
U1 SC1592
IN
R opt 10k
+2.5V Vin
C2 22uF (cer)
R2 66.5
C3 100uF (cer)
SENSE GND ILIM
R3 53
EN
VOUT = (1 + VREF
R2 ) * VREF R3 = 0.8 V typ.
R1 100
Evaluation Board Schematic - Bill of Material
R ef 1 2 3 4 5 6 7 8 Qty 1 1 1 1 1 1 1 1 C1 C2 C3 R1 R2 R3 Ropt U1 Reference Part Number/Value 2.2uF, 16V, Ceramic, 1206 22uF, 10V, Ceramic, 1210 100uF, 6.3V, Ceramic, 1812 100, 5%, 0805 66.5, 0.5%, 0805 53, 0.5%, 0805 10K, 10%, 0805 S C 1592 Manufacturer Murata or similar Murata or similar Murata or similar Any Any Any Any Semtech Corp.
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SC1592
POWER MANAGEMENT Evaluation Board - SOIC-8 EDP
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SC1592
POWER MANAGEMENT Evaluation Board - TO-263-7L (DDPAK)
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SC1592
POWER MANAGEMENT Outline Drawing - SOIC-8L EDP
Land Pattern - SOIC-8L EDP
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SC1592
POWER MANAGEMENT Outline Drawing - TO-263-7L (DDPAK)
Recommended Land Pattern - TO-263-7L (DDPAK)
(FOR REFERENCE)
Contact Information
Semtech Corporation Power Management Products Division 200 Flynn Road, Camarillo, CA 93012 Phone: (805)498-2111 FAX (805)498-3804
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