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LD3980
Low drop - Low supply voltage Low ESR capacitor compatible
Feature summary

Input voltage from 1.7 to 3.6V Ultra low dropout voltage (130mV typ. at 300mA load) Very low quiescent current (110A typ. at no load, 130A max. at 300mA load; max 0.5A in OFF MODE) Output voltage tolerance: +/- 1.0% @ 25C, +/2.0% full temperature range Guaranteed output current up to 300mA Wide range of output voltage: 0.8V to 3.0V Logic-controlled electronic shutdown Compatible with ceramic capacitor CO = 1F Internal current and thermal limit Temperature range: -40C to 85C
DFN6 (3x3)

Description
The LD3980 provides up to 300mA, from 1.7V to 3.6V input voltage. It can deliver a guaranteed 300mA continuous load current with a low 100mV dropout. It is stable with ceramic capacitor. The
ultra low drop-voltage, low quiescent current and low noise makes it suitable for low power applications and in battery powered systems. High power supply rejection is maintained down to low input voltage levels common to battery operated circuits. Shutdown Logic Control function is available this means that when the device is used as local regulator, it is possible to put a part of the board in standby, decreasing the total power consumption. The device also includes a constant current limiting and thermal overload protection. Typical applications are in mobile phone, personal digital assistant (PDAs), cordless phone and similar battery powered wireless systems, portable information appliances..
Block diagram
December 2006
Rev. 1
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www.st.com
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LD3980
Contents
1 2 3 4 5 6 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Detailed description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
6.1 6.2 6.3 6.4 6.5 Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Current limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Thermal overload protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Power dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Output capacitance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
7 8 9
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Order code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
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LD3980
Pin configuration
1
Figure 1.
Pin configuration
Pin connections
Table 1.
Pin N 1 2, 3 4 5 6
Pin description
Symbol OUT NC GND SHDN IN Output Voltage of the LDO Not connected Common ground. SHUTDOWN Input Voltage: Active-Low Shutdown input. A logic Low reduces supply current to below 1A. Connect to IN or logic high for normal operation Input Voltage of the LDO Name and function
Table 2.
Symbol RthJA
Thermal data
Parameter Thermal resistance junction-ambient Value 55 Unit C/W
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Maximum ratings
LD3980
2
Table 3.
Maximum ratings
Absolute maximum ratings
Parameter DC Input voltage DC Output voltage Shutdown input voltage Reset output voltage Output current Power dissipation Storage temperature range Operating junction temperature range Value -0.3 to 4.6 -0.3 to VI +0.3 -0.3 to VI +0.3 -0.3 to VI +0.3 Internally limited Internally limited -65 to 150 -40 to 85 Unit V V V V mA mW C C
Symbol VI VO VSHDN VRESET IO PD TSTG TOP
Note:
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied.
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LD3980
Typical application
3
Figure 2.
Typical application
Application circuit
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Electrical characteristics
LD3980
4
Table 4.
Symbol VI VO VO VO VDROP eN
Electrical characteristics
Electrical characteristics (TJ = 25C, VI = VO(NOM) +0.5V, CI = CO = 1F, IO = 1mA, VSHDN = VI, unless otherwise specified) (Note: 1)
Parameter Operating input voltage VO Accuracy Line regulation Load regulation Dropout voltage (Note 2) Output noise voltage IO = 300mA TJ = -40 to 85C VI = VO + 0.5V to 3.6V, IO = 1mA IO = 1mA to 300mA IO = 300mA, VO 1.8V TJ = -40 to 85C 10Hz to 100KHz, IO = 10mA, VI = VO(NOM)+0.5VVRIPPLE VRIPPLE = 0.1V, f = 1KHz, IO = 10mA VIN = VO(NOM)+0.5VVRIPPLE VRIPPLE = 0.1V, f=10KHz, IO = 10mA IO=0mA Quiescent current ON MODE: VSHDN=1.4V IO=0mA, TJ = -40 to 85C IO=0 to 300mA IO=0 to 300mA, TJ = -40 to 85C Quiescent current V input current OFF MODE: VSHDN=GND I ISC IO(PK) Short circuit current Peak output current Shutdown input logic low RL=0 VO VO(NOM) -5% VI = 1.6V to 3.6V TJ = -40 to 85C VSHDN=GND or VI 0.15 650 610 0.4 V 1.4 0.1 120 140 1 10 10 5000 100 nA s C F m 105 130 0.5 mA mA Test conditions Min. 1.7 -1.0 -2.0 -0.15 0.01 0.2 130 110.7 60 dB 58 90 110 A Typ. Max. 3.6 +1.0 % +2.0 +0.15 0.3 150 %/V %/mA mV VRMS/VO Unit V
SVR
Supply voltage rejection (Figure 7.)
IQ
VSHDN ISHDN TON TSHDN CO
Shutdown input logic high Shutdown input current Turn on time Thermal shutdown Output capacitor
Note 3 Note 4
Capacitance ESR
Note:
1 2
For VO(NOM) < 1.2V, VI=1.7V Dropout voltage is the input-to-output voltage difference at which the output voltage is 100mV below its nominal value. This specification does not apply for output voltages below 1.7V. Turn-on time is time measured between the enable input just exceeding VSHDN High Value and the output voltage just reaching 95% of its nominal value Typical thermal protection hysteresis is 15C.
3 4
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LD3980
Typical characteristics
5
Figure 3.
Typical characteristics
Output voltage vs temperature Figure 4. Output voltage vs input voltage
Figure 5.
Inhibit voltage vs temperature
Figure 6.
Dropout voltage vs temperature
Figure 7.
S.V.R. vs frequency
Figure 8.
Stability value
VI=VO(NOM) +0.5V+VRIPPLE, IO=10mA CI =CO= 1F
VI= from 1.76 to 3.6V, IO=from 1mA to 0.3A
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Typical characteristics
LD3980
Figure 9.
Stability value
Figure 10. Load transient
VI= from 1.76 to 3.6V, IO=from 1mA to 0.3A
VINH=VI, IO=10 to 300mA No CO,CI= 1F, TRISE=TFALL=5s
Figure 11. Line transient
VINH=VI, IO=1mA No CI, CO= 1F, TRISE=TFALL=1s
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LD3980
Detailed description
6
Detailed description
The device is a low-dropout, low quiescent current linear regulator designed primarily for battery-powered applications. It supplies a regulated output voltage for load currents up to 300mA. The LD3980 consists of a precision bandgap, error amplifier, output p-channel MOS. The 0.7V bandgap reference is connected to the error amplifier. The error amplifier compares this reference to the feedback voltage and amplifies the difference. The MOSFET driver reads the error signal and applies the appropriate drive to the P-channel pass transistor. If the feedback voltage is lower than reference voltage, the pass transistor is pulled lower, allowing more current to pass and increasing the output voltage. If the feedback voltage is higher than the reference voltage, the pass transistor gate is driven higher, allowing less current to pass the output. The output voltage is feedback through an internal resistor voltage connected to OUT. Additional blocks include an output current limiter, a thermal sensor and shutdown logic.
6.1
Shutdown
Drive SHDN low to place the LD3980 in shutdown mode for DFN versions. In shutdown mode, the pass transistor, control circuit, reference and all biases are turned off, reducing the supply current to typically 0.5A. Connecting SHDN to IN every block is in normal operation.
6.2
Current limit
The device includes short-circuit protection. It includes a current limiter that controls the pass transistor's gate voltage to limit the output current to about 600mA.
6.3
Thermal overload protection
The Thermal over load protection limits total power dissipation in the device. When the junction temperature (TJ) exceeds +140C, the thermal sensor sends a signal to the shutdown logic, turning off the pass transistor and allowing the device to cool. The pass transistor turns on again after the device's junction temperature typically cools by 15C, resulting in a pulsed output during continuous thermal overload conditions.
6.4
Power dissipation
Maximum power dissipation of the LD3980 depends on the thermal resistance of the case and circuit board, the temperature difference between the die junction and ambient air, and the rate of air flow. The power dissipated by the device is: PD = IO (VI - VO) The maximum power dissipation is: PMAX = (TJMAX - TA) / JA Where: TJMAX = +150C
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Detailed description TA is the ambient temperature JA thermal resistance.
LD3980
The device's pins perform the dual function of providing an electrical connection as well as channeling heat away from the die. Use wide circuit-board traces and large, solid copper polygons to improve power dissipation. Using multiple vias to buried ground planes further enhances thermal conductivity.
6.5
Output capacitance
The device is specifically designed to employ ceramic output capacitors as low as 1F. Ceramic capacitors below 10F offer significant cost and space savings, along with high frequency noise filtering. Higher values and other types of capacitor may be used, but their equivalent series resistance should be maintained in the range of the table.
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LD3980
Package mechanical data
7
Package mechanical data
In order to meet environmental requirements, ST offers these devices in ECOPACK(R) packages. These packages have a Lead-free second level interconnect. The category of second level interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com.
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Package mechanical data
LD3980
DFN6 (3x3) MECHANICAL DATA
mm. DIM. MIN. A A1 A2 A3 b D D2 E E2 e L L1 L2 K 0.20 0.20 0.24 0.13 7.9 0.33 2.90 1.92 2.90 1.11 0.95 0.45 7.9 9.4 5.1 3.00 3.00 0.80 0 0.65 0.20 0.43 3.10 2.12 3.10 1.31 13.0 114.2 75.6 114.2 43.7 37.4 17.7 118.1 118.1 TYP MAX. 1.00 0.05 0.75 MIN. 31.5 0.0 25.6 7.9 16.9 122.0 83.5 122.0 51.6 TYP. MAX. 39.4 2.0 29.5 mils
7387339A
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LD3980
Package mechanical data
Tape & Reel QFNxx/DFNxx (3x3) MECHANICAL DATA
mm. DIM. MIN. A C D N T Ao Bo Ko Po P 3.3 3.3 1.1 4 8 12.8 20.2 60 18.4 0.130 0.130 0.043 0.157 0.315 TYP MAX. 330 13.2 0.504 0.795 2.362 0.724 MIN. TYP. MAX. 12.992 0.519 inch
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Order code
LD3980
8
Table 5.
Order code
Order code
Part number LD3980PM08R LD3980PM12R LD3980PM13R LD3980PM135R LD3980PM15R LD3980PM18R LD3980PM30R Output voltage (1) 0.8 V 1.2 V (2) 1.3 V (2) 1.35 V 1.5 V (2) 1.8 V 3.0 V (2)
1. Other values of VO available on request 2. Available on request
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LD3980
Revision history
9
Table 6.
Date
Revision history
Revision history
Revision 1 First release. Changes
05-Dec-2006
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LD3980
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