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Advanced Monolithic Systems
FEATURES
* Fixed and Adjustable Versions Available * Output Current up to 500mA * Very Low Quiescent Current * Input-output Differential less than 0.5V * Short Circuit Protection * Internal Thermal Overload Protection * ENABLE Pin available in selected packages
AMS5105
500mA CMOS LOW DROPOUT VOLTAGE REGULATOR
RoHS compliant
APPLICATIONS
* Cellular Telephones * Portable Consumer Equipment * Portable (Notebook) Computers * Battery Powered Systems * Portable Instrumentation * Radio Control Systems * CD/DVD drives
GENERAL DESCRIPTION
The AMS5105 series consists of positive fixed and adjustable voltage regulators ideally suited for use in battery-powered systems. These devices feature very low quiescent current (500uA or less) when supplying loads up to 500mA, and a standby current less than 500nA when disabled using the ENABLE pin (available in selected packages). These unique characteristics and the low input-output differential required for proper regulation (0.5V for output currents of 500mA) make the AMS5105 ideal for use in standby power systems. Internal current limiting and thermal shutdown features provide protection for all AMS5105 series devices regardless of package type. The AMS5105 is offered as fixed voltage regulators in the 5 lead SOT-23, SOT-89, SOT-223, and 8 lead SOIC packages, and as adjustable voltage regulators in the 5 lead SOT-23 and 8 lead SOIC packages. All devices in the 5 lead SOT-23 and 8 lead SOIC packages are provided with ENABLE pin.
ORDERING INFORMATION
OUTPUT 5L SOT-23 VOLTAGE FIXED AMS5105M1-X ADJUSTABLE AMS5105M1 X = 1.5V, 1.8V, 2.5V, 2.8V, 3.3V.
PACKAGE TYPE SOT-89 AMS5105L-X SOT-223 AMS5105-X SO-8 AMS5105S-X AMS5105S
TEMP. RANGE -25C to 125C -25C to 125C
PIN CONNECTIONS
5 Lead SOT-23 (M1) SOT-89 (L) SOT-223 8 Lead SOIC (S)
VIN
1
5
VOUT
FB N/C
VOUT
1 2 GND 3 1 2 GND 3
1
8
VIN
GROUND 2 ENABLE 3 4
GROUND 2
7 GROUND 6 GROUND 5 ENABLE N/C
V OUT
V IN
V OUT
V IN
GROUND 3 FB 4 N/C
Top View
Top View
Top View
Top View
Advanced Monolithic Systems, Inc. www.advanced-monolithic.com
Phone (925) 443-0722
Fax (925) 443-0723
AMS5105
ABSOLUTE MAXIMUM RATINGS (Note 1)
Input Supply Voltage Internal Power Dissipation (Note 4) ESD -0.3 to +6.5V Internally Limited 2000V Maximum Junction Temperature +125C Storage Temperature -65C to +150C Lead Temperature (Soldering 25 sec) 265C
ELECTRICAL CHARACTERISTICS
Electrical Characteristics at VIN =VOUT +1V, IOUT =1mA, TJ=25C, COUT = 2.2F unless otherwise specified. PARAMETER
Fixed Output Voltage Versions Output Voltage Tolerance (VOUT+1V) VIN 6V, IOUT=100 mA -25C T 125C
J
CONDITIONS
AMS5105-X Min. Typ. Max.
-1.5 - 3.0 5 8 30 50 20 100 400 450 450 450 100 +1.5 + 3.0 10 30 50 70 25 125 500 550 550 550 500 6
Units
% % mV/V mV/V mV mV mV mV mV A A A nA V
Line Regulation Load Regulation
(VIN+1V) V 6V
IN
1mA I I
5mA I Dropout Voltage I I Quiescent Current I I I Maximum Operational Input Voltage
ENABLE
OUT OUT OUT OUT OUT OUT
OUT OUT
100 mA 500 mA
= 10 mA = 100 mA = 500 mA = 10 mA = 100 mA = 500 mA
RL = 500, In disabled state, VENABLE = 0
Threshold Voltage
VIN = 3V to 6V (Note 6) 60 VENABLE = 0.6 x VIN, VIN = 3V to 6V (Note 7) 0.01 20 15 1 30 % VIN % VIN nA s
Enabled Disabled
ENABLE
Threshold Current
Wake-Up Response Time (from disabled state)
Advanced Monolithic Systems, Inc. www.advanced-monolithic.com
Phone (925) 443-0722
Fax (925) 443-0723
AMS5105
ELECTRICAL CHARACTERISTICS
Electrical Characteristics at VIN =6V, VOUT =3V, IOUT =1mA, TJ=25C, COUT = 2.2F unless otherwise specified. PARAMETER
Adjustable Version Reference Voltage IOUT 100 mA, -25C T 125C
J
CONDITIONS
(Note 2)
Min.
1.231
AMS5105 Typ.
1.250 1.250 0.3 1 20 100 400 350 350 350 100
Units Max.
1.269 1.282 5 1.5 1 2 25 125 500 450 450 450 500 6 V V V % % % mV mV mV A A A nA V
Measured from FB pin to GROUND Output Voltage Range Line Regulation Load Regulation VOUT + 1V V 6V
IN
1.218 1.25
1mA I 100 mA 5mA I 500 mA
O O
Dropout Voltage
I I I
OUT OUT OUT OUT OUT OUT
10 mA = 100 mA = 500 mA (Note 5) = 10 mA = 100 mA = 500 mA
Quiescent Current
I I I
RL = 500, In disabled state, VENABLE = 0 Maximum Operational Input Voltage
ENABLE
Threshold Voltage
VIN = 3V to 6V (Note 6) 60 VENABLE = 0.6 x VIN, VIN = 3V to 6V (Note 7) 0.01 20 15 1 30 % VIN % VIN nA s
Enabled Disabled
ENABLE
Threshold Current
Wake-Up Response Time (from disabled state)
Note 1: Absolute Maximum Ratings are limits beyond which damage to the device may occur. For guaranteed performance limits and associated test conditions, see the Electrical Characteristics tables. Note 2: To ensure constant junction temperature, low duty cycle pulse testing is used. Note 3: Limits appearing in boldface type apply over the entire junction temperature range for operation. Limits appearing in normal type apply for TA = TJ = 25C. Note 4: The maximum allowable power dissipation is a function of the maximum junction temperature TJ(MAX), the junction-to ambient thermal resistance J-A and the ambient temperature TA. The maximum allowable power dissipation at any ambient temperature is calculated using:
P(MAX) =
TJ(MAX) - TA
J - A
Where the values of the junction-to-ambient thermal resistances are as follows: 220C/W for 5 lead SOT-23 (M1) and 160C/W for the molded plastic SO-8 (S). Note 5: Dropout Voltage is defined as the input to output differential at which the output voltage drops 100mV below its nominal value measured at 1V differential. Note 6: ENABLE Threshold Voltage levels are specified as a percentage of input voltage VIN. Quiescent current can be minimized by choosing VENABLE HIGH equal to VIN. Note 7: Time required for VOUT to reach 95% of output voltage setting after VENABLE is switched from 0V to VIN.
Advanced Monolithic Systems, Inc. www.advanced-monolithic.com
Phone (925) 443-0722
Fax (925) 443-0723
AMS5105
TYPICAL PERFORMANCE CHARACTERISTICS
Advanced Monolithic Systems, Inc. www.advanced-monolithic.com
Phone (925) 443-0722
Fax (925) 443-0723
AMS5105
AMS5105/-X Pin Description 5-Lead SOT-23 PIN NAME DESCRIPTION 1 VIN Unregulated input voltage Connect CIN from VIN to GND 2 GND Ground connection for VIN and VOUT 3 ENABLE Logical high enables regulator Logical low disables regulator 4 FB Feedback from resistor divider Used to set output voltage Adjustable versions only (See Figures 3 and 4) 5 VOUT Regulated output voltage Connect COUT from VOUT to GND
Advanced Monolithic Systems, Inc. www.advanced-monolithic.com
Phone (925) 443-0722
Fax (925) 443-0723
AMS5105
APPLICATION NOTES
Definition of Terms higher loads, the value of the capacitor should be increased, especially when the output voltage is set for 2.5V or less. The AMS5105 lowest fixed output voltage value is 1.5V. Programming the Output Voltage The AMS5105 may be programmed for any output voltage between its 1.25V reference and its 6V maximum rating, allowing for dropout and power dissipation. As shown in Figure 3, an external pair of resistors is required. The equation for the output voltage is: VOUT = VREF (1 + R1/ R2) where VREF is the nominal 1.25 reference voltage.
Dropout Voltage: The input-output voltage differential at which
the circuit stops to regulate against further reduction in input voltage. Measured when the output voltage has dropped 100mV from the nominal voltage obtained at 1V input, dropout voltage is dependent upon load current and junction temperature. Input Voltage: The DC voltage applied to the input terminal with respect to ground. Input-Output Differential: The voltage difference between the unregulated input voltage and the regulated output voltage for which the regulator will regulate. Line Regulation: The change in output voltage for a change in the input voltage. The line regulation is measured under conditions of low dissipation or by using low duty cycle pulse testing such that the average chip temperature is not significantly affected. Load Regulation: The change in output voltage for a change in load current at constant chip temperature. Long term stability: Output voltage stability under accelerated life-test conditions after 1000 hours with maximum rated voltage and junction temperature. Quiescent Current: That part of the positive input current that does not contribute to the positive load current. The regulator ground lead current. Temperature Stability of VO: The percentage change in output voltage for a thermal variation from room temperature to either temperature extreme.
Typical application circuit (adjustable output)
External capacitor
The AMS5105 series requires an output capacitor of 2.2F or greater to ensure device stability, as shown in Figures 1 through 4. Without the capacitor the device may oscillate. Most types of tantalum or electrolytic capacitor can be used in the applications. The value of this capacitor can be increased without limits. For
TYPICAL APPLICATION
+VIN
+
+VIN VOUT
+ +
+VIN
+
2.2 F CIN
3 +VIN
VOUT 1
2.2 F CIN
1 +VIN
VOUT 5
+
VOUT 2.2 F COUT
2.2 F CIN
AMS5105-X GND 2
2.2 F COUT
AMS5105-X 3 ENABLE GND 2
3 ENABLE GND 2
VOUT 5 AMS5105 R1 FB 4 1.25V VREF R2
+
1 +VIN
VOUT 2.2 F COUT
Figure 1
Figure 2
Figure 3
Advanced Monolithic Systems, Inc. www.advanced-monolithic.com
Phone (925) 443-0722
Fax (925) 443-0723
AMS5105
PACKAGE DIMENSIONS inches (millimeters) unless otherwise noted.
5 LEAD SOT-23 PLASTIC PACKAGE (M1)
0.110-0.120 (2.794-3.048)
0.102-0.118 (2.60-3.00) 0.059-0.070 (1.50-1.75)
0.037 (0.95) TYP 0.018-0.024 (0.457-0.610)
0.014-0.020 (0.350-0.50)
10 NOM
0.036-0.051 (0.090-1.30) 0.0035-0.0080 (0.090-0.20) 0.003 (0.150) MAX 0.075 (1.90) TYP 10 NOM 0.018-0.024 (0.457-0.610)
(SOT-23-5 ) AMS DRW# 051001
SOT-89 PLASTIC PACKAGE (L)
0.173-0.181 (4.40-4.60) 0.064-0.072 (1.62-1.83)
0.055-0.063 (1.40-1.60)
0.014-0.017 (0.35-0.44)
0.155-0.167 (3.94-4.25) 0.090-0.102 (2.29-2.60) 0.084-0.090 (2.13-2.29)
0.035-0.047 (0.89-1.20) 0.059 (1.50) BSC 0.118 (3.00) BSC 0.014-0.019 (0.36-0.48)
L (SOT-89 ) AMS DRW# 042392
0.017-0.022 (0.44-0.56)
Advanced Monolithic Systems, Inc. www.advanced-monolithic.com
Phone (925) 443-0722
Fax (925) 443-0723
AMS5105
3 LEAD SOT-223 PLASTIC PACKAGE
8 LEAD SOIC PLASTIC PACKAGE (S)
0.189-0.197* (4.801-5.004) 8 7 6 5
0.228-0.244 (5.791-6.197)
0.150-0.157** (3.810-3.988)
1
2
3
4
0.053-0.069 (1.346-1.752)
0.010-0.020 x 45 (0.254-0.508) 0.004-0.010 (0.101-0.254) 0.008-0.010 (0.203-0.254) 0-8 TYP
0.014-0.019 (0.355-0.483)
0.050 (1.270) TYP
0.016-0.050 (0.406-1.270)
S (SO-8 ) AMS DRW# 042293
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE **DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
Advanced Monolithic Systems, Inc. www.advanced-monolithic.com
Phone (925) 443-0722
Fax (925) 443-0723

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