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S5U2188
1.5A CMOS
Elektronische Bauelemente
RoHS Compliant Product
Low Dropout Voltage Regulator
Description
The S5U2188 of positive,linear regulators feature low quiescent current (45A typ.) with low dropout voltage, making them ideal for battery applications. Output voltage are set at the factory and trimmed to 1.5% accuracy.These rugged devices have both Thermal Shutdown and Current Fold-back to prevent device failure under the "Worst" of operating conditions.The S5U2188 is stable with an output capacitance of 4.7F or greater.
Features
REF.
* Low Temperature Coefficient * Over-Temperature Shutdown
* Adjustable Version * Very Low Dropout Voltage * High Accurate 1.5% * Short Circuit Current Fold-back * Guaranteed 1.5A output * Current Limiting * Power-Saving Shutdown Mode
A b L4 c L1 E
Millimeter Min. Max. 4.40 4.80 0.66 0.91 0.00 0.30 0.36 0.5 2.29 2.79 9.80 10.4
REF. c2 L2 e L
Millimeter Min. Max. 1.25 1.45 1.27 REF. 8.6 9.0 1.70 REF. 14.6 15.8 0 8
Applications
* PC Peripherals * Wireless Devices
* Portable Electronics * Battery Powered Widgets * Instrumentation
Functional Block Diagram
Typical Application Circuit
S5U2188
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01-Jun-2002 Rev. A
Page 1 of 7
S5U2188
Elektronische Bauelemente
1.5A CMOS Low Dropout Voltage Regulator
Absolute Maximum Ratings
Parameter
Input Voltage Output Current Output Voltage Operating Ambient Temperature Junction Temperature Max. Junction Temperature Power Dissipation ( EDS Classification
Symbol
VIN IOUT VOUT Topr Tj Tj Max. PD
Ratings
8
PD/(VIN-VO) Gnd-0.3~VIN+0.3 -40~+85 -40~+125 150 3.0
Unit
V mA
o o
V
C C
T=100 C)
o
C W
o
B
Electrical Characteristics VIN=VOUT(T)+2V, VEN=VIN, TA=25 : unless otherwise
Parameter Output Voltage Output Current Current Limit Load Regulation Dropout Voltage Ground Pin Current Line Regulation Input Voltage
Over Temperature Shutdown Over Temperature Hysterisis
Symbol VOUT(E)
(Note1)
Condition
VEN=VEHmin, IO=1mA VOUT>1.2V VOUT>1.2V IO=1mA to 1.5A IO=1.5A 2.0VMin
-1.5% 1.5 1.5 -1 -0.15 -0.1 -0.4 Note3 -
Typ
VOUT(T)
(Note2)
Max
1.5% 1 1300 800 600 0.15 0.1 0.4 7 1.261 VIN 0.4 0.1 0.5 2
Unit
V A A % mV A % V : : ppm/ : mA A mA V dB Vrms V V A A A
IO ILIM REGLOAD VDROPOUT IGND REGLINE VIN OTS OTH TC ISC IADJ IMin VREF PSRR eN VEH VEL IEH IEL ISD
2.0 0.2 45 0.02 150 30 30 750 1 1.242 50 20 30 0.5
Output Voltage Temperature Coefficient Short Circuit Current ADJ Input Bias Current Minimum Load Current ADJ Reference Voltage Power Supply Rejection Output Voltage Noise EN Input Threshold EN Input Bias Current Shutdown Supply Current
certain IOUT value).
VOUT<0.4V VIN=5V, VADJ=1.242V
1 1.223
Io=100mA Co=4.7 F ceramic
f=1kHz f=10kHz
2.0 0 -
f=10Hz~100kHz Co=4.7 F Io=10mA, VIN=2.7V to 7V VIN=2.7V to 7V VIN=7V VEN= 0V, VIN=7V VIN=5V, VOUT=0V, VEN=0V
Note 1: VOUT (E) =Effective Output Voltage (i.e. the output voltage when "VOUT (T) + 2.0V" is provided at the VIN pin while maintaining a 2: VOUT (T) =Specified Output Voltage 3: VIN (MIN) =VOUT+VDROPOUT
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01-Jun-2002 Rev. A
Page 2 of 7
S5U2188
Elektronische Bauelemente
1.5A CMOS Low Dropout Voltage Regulator
Ordering Information(contd.)
Part Number
S5U 2188-AD
Marking
8HAD2 XXXX
Output Voltage
Adjustable
Part Number
Marking
Output Voltage
The S5U2188 of COMS regulator contains a PMOS pass transistor, voltage reference, error amplifier, overcurrent protection, and thermal shutdown. The P-channel pass transistor receives data from the error amplifier, over-current shutdown, and thermal protection circuits. During normal operation, the error amplifier compares the output voltage to a precision reference. Over-current and Thermal shutdown circuits become active when the junction temperature exceeds 140 : , or the current exceeds 2.2A. During thermal shutdown, the output voltage remains low. Normal operation is restored when the junction temperature drops below 120 : . The S5U2188 behaves like a current source when the load reaches 2.2A. However, if the load impedance drops below 0.3 , the current drops back to 600mA to prevent excessive power dissipation. Normal operation is restored when the load resistance exceeds 0.75 .
Detailed Description
External Capacitors
The S5U2188 is stable with an output capacitance to ground of 4.7 F or greater. Ceramic capacitors have the lowest ESR, and will offer the best AC performance. Conversely, Aluminum Electrolytic capacitors exhibit the highest ESR, resulting in the poorest AC response. Unfortunately, large value ceramic capacitors are comparatively expensive. One option is to parallel a 0.1 F ceramic capacitor with a 10 F Aluminum Electrolytic. The benefit is low ESR, high capacitance, and low overall cost. A second capacitor is recommended between the input and ground to stabilize Vin. The input capacitor should be at least 0.1 F to have a beneficial effect. All capacitors should be placed in close proximity to the pins. A "Quiet" ground termination is desirable. This can be achieved with a "Star" connection.
Enable
When pulled low, the PMOS pass transistor shuts off, and all internal circuits are powered down. In this state, the quiescent current is less than 1 A. This pin behaves much like an electronic switch. 100k resistor is necessary between VEN source and EN pin when VEN is higher than VIN.
(Note: there is no internal pull-up for EN PIN)
Adjustable Version
The adjustable version uses external feedback resistors to generate an output voltage anywhere from 1.5V to 5.0V. Vadj is trimmed to 1.242V and Vout is given by the equation: VOUT=Vadj * (1+R1/R2) Feedback resistors R1 and R2 should be high enough to keep quiescent current low, but increasing R1+R2 will reduce stability. In general, R1 and R2 in the 10's of k will produce adequate stability, given reasonable layout precautions. To improve stability characteristics, keep parasitic on the ADJ pin to minimum, and lower R1 and R2 values.
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01-Jun-2002 Rev. A
Page 3 of 7
S5U2188
Elektronische Bauelemente
1.5A CMOS Low Dropout Voltage Regulator
Characteristics Curve
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01-Jun-2002 Rev. A
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S5U2188
Elektronische Bauelemente
1.5A CMOS Low Dropout Voltage Regulator
115 : 85 : 55 :
25 : -5 : -45 :
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01-Jun-2002 Rev. A
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S5U2188
Elektronische Bauelemente
1.5A CMOS Low Dropout Voltage Regulator
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01-Jun-2002 Rev. A
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S5U2188
Elektronische Bauelemente
1.5A CMOS Low Dropout Voltage Regulator
External Resistor Divider Table
R1(k[ ) VOUT
1.30 1.35 1.40 1.45 1.50 1.55 1.60 1.65 1.70 1.75 1.80 1.85 1.90 1.95 2.00 2.05 2.10 2.15 2.20 2.25 2.30 2.35 2.40 2.45 2.50 2.55 2.60 2.65 2.70 2.75 2.80 2.85 2.90 2.95 3.00 3.05 3.10 3.15
1
21.41 11.50 7.86 5.97 4.81 4.03 3.47 3.04 2.71 2.44 2.23 2.04 1.89 1.75 1.64 1.54 1.45 1.37 1.30 1.23 1.17 1.12 1.07 1.03 0.99 0.95 0.91 0.88 0.85 0.82 0.80 0.77 0.75 0.73 0.71 0.69 0.67 0.65
2
5
10
20
50
R2(k[ )=(1.242*R1(k [ ))/(VOUT-1.242) 42.83 107.07 214.14 428.28 1070.7 23.00 15.72 11.94 9.63 8.06 6.94 6.09 5.42 4.89 4.45 4.09 3.78 3.51 3.28 3.07 2.90 2.74 2.59 2.46 2.35 2.24 2.15 2.06 1.97 1.90 1.83 1.76 1.70 1.65 1.59 1.54 1.50 1.45 1.41 1.37 1.34 1.30 57.50 115.00 230.00 575.00 39.30 29.86 24.07 20.16 17.35 15.22 13.56 12.22 11.13 10.21 9.44 8.77 8.19 7.69 7.24 6.84 6.48 6.16 5.87 5.60 5.36 5.14 4.94 4.75 4.57 4.41 4.26 4.12 3.99 3.86 3.75 3.64 3.53 3.43 3.34 3.25 78.61 157.22 393.04 59.71 119.42 298.56 48.14 40.32 34.69 30.44 27.12 24.45 22.26 20.43 18.88 17.54 16.39 15.37 14.48 13.68 12.96 12.32 11.74 11.21 10.73 10.28 9.87 9.50 9.15 8.82 8.52 8.24 7.97 7.72 7.49 7.27 7.06 6.87 6.68 6.51 96.28 240.70 80.65 201.62 68.39 173.46 60.88 152.21 54.24 135.59 48.90 122.24 44.52 111.29 40.86 102.14 37.75 35.08 32.77 30.74 28.95 27.36 25.93 24.65 23.48 22.42 21.45 20.56 19.75 18.99 18.29 17.64 17.04 16.47 15.94 15.45 14.98 14.54 14.13 13.74 13.37 13.02 94.38 87.71 81.93 76.86 72.38 68.39 64.82 61.61 58.70 56.05 53.63 51.41 49.36 47.48 45.73 44.11 42.59 41.18 39.86 38.62 37.45 36.36 35.32 34.35 33.42 32.55
R1(k[ ) VOUT
3.20 3.25 3.30 3.35 3.40 3.45 3.50 3.55 3.60 3.65 3.70 3.75 3.80 3.85 3.90 3.95 4.00 4.05 4.10 4.15 4.20 4.25 4.30 4.35 4.40 4.45 4.50 4.55 4.60 4.65 4.70 4.75 4.80 4.85 4.90 4.95 5.00
1
0.63 0.62 0.60 0.59 0.58 0.56 0.55 0.54 0.53 0.52 0.51 0.50 0.49 0.48 0.47 0.46 0.45 0.44 0.43 0.43 0.42 0.41 0.41 0.40 0.39 0.39 0.38 0.38 0.37 0.36 0.36 0.35 0.35 0.34 0.34 0.33 0.33
2
1.27 1.24 1.21 1.18 1.15 1.13 1.10 1.08 1.05 1.03 1.01 0.99 0.97 0.95 0.93 0.92 0.90 0.88 0.87 0.85 0.84 0.83 0.81 0.80 0.79 0.77 0.76 0.75 0.74 0.73 0.72 0.71 0.70 0.69 0.68 0.67 0.66
5
3.17 3.09 3.02 2.95 2.88 2.81 2.75 2.69 2.63 2.58 2.53 2.48 2.43 2.38 2.34 2.29 2.25 2.21 2.17 2.14 2.10 2.06 2.03 2.00 1.97 1.94 1.91 1.88 1.85 1.82 1.80 1.77 1.75 1.72 1.70 1.67 1.65
10
6.34 6.19 6.03 5.89 5.76 5.63 5.50 5.38 5.27 5.16 5.05 4.95 4.86 4.76 4.67 4.59 4.50 4.42 4.35 4.27 4.20 4.13 4.06 4.00 3.93 3.87 3.81 3.75 3.70 3.64 3.59 3.54 3.49 3.44 3.40 3.35 3.30
20
12.69 12.37 12.07 11.78 11.51 11.25 11.00 10.76 10.53 10.32 10.11 9.90 9.71 9.52 9.35 9.17 9.01 8.85 8.69 8.54 8.40 8.26 8.12 7.99 7.87 7.74 7.62 7.51 7.40 7.29 7.18 7.08 6.98 6.88 6.79 6.70 6.61
50
31.72 30.93 30.17 29.46 28.78 28.13 27.50 26.91 26.34 25.79 25.26 24.76 24.28 23.81 23.36 22.93 22.52 22.12 21.73 21.35 20.99 20.64 20.31 19.98 19.66 19.36 19.06 18.77 18.49 18.22 17.96 17.70 17.45 17.21 16.98 16.75 16.52
R2(k[ )=(1.242*R1(k [ ))/(VOUT-1.242)
Note: Small load (greater than 2mA) is necessary as R1 or R2 is larger than 50k[ . Otherwise, output voltage probably can not be pulled down to 0V on disable mode.
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