LD3985M系列IC

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October 2004

s INPUT VOLTAGE FROM 2.5V TO 6V s

STABLE WITH LOW ESR CERAMIC CAPACITORS

s

ULTRA LOW DROPOUT VOLTAGE (100mV TYP . AT 150mA LOAD, 0.4mV TYP. AT 1mA LOAD)

s

VERY LOW QUIESCENT CURRENT (85µA TYP . AT NO LOAD, 170µA TYP . AT 150mA LOAD; MAX 1.5µA IN OFF MODE)

s

GUARANTEED OUTPUT CURRENT UP TO 150mA

s

WIDE RANGE OF OUTPUT VOLTAGE: 1.2V; 1.22V; 1.25V; 1.35V; 1.5V; 1.8V; 2V; 2.1V; 2.2V; 2.4V; 2.5V; 2.6V; 2.7V; 2.8V; 2.85V; 2.9V; 3V; 3.1V; 3.2V; 3.3V; 4.7V; 5V

s

FAST TURN-ON TIME: TYP . 200µs [C O =1µF, C BYP = 10nF AND I O =1mA]

s

LOGIC-CONTROLLED ELECTRONIC SHUTDOWN

s INTERNAL CURRENT AND THERMAL LIMIT s

OUTPUT LOW NOISE VOLTAGE 30µVRMS OVER 10Hz to 100KHz

s S.V.R. OF 60dB AT 1KHz, 50dB AT 10KHz s

TEMPERATURE RANGE: -40°C TO 125°C

DESCRIPTION

The LD3985 provides up to 150mA, from 2.5V to 6V input voltage.

The ultra low drop-voltage, low quiescent current and low noise make it suitable for low power applications and in battery powered systems.Regulator ground current increases only slightly in dropout, further prolonging the battery life. Power supply rejection is better than 60 dB at low frequencies and starts to roll off at 10KHz. 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 LD3985 is designed to work with low ESR ceramic capacitors. Typical applications are in mobile phone and similar battery powered wireless systems.

LD3985SERIES

ULTRA LOW DROP-LOW NOISE BICMOS VOLTAGE REGULATORS LOW ESR CAPACITORS COMPATIBLE

Rev. 8

LD3985 SERIES

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Table 1: Absolute Maximum Ratings

Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied.

(*) The input pin is able to withstand non repetitive spike of 6.5V for 200ms.

Table 2: Thermal Data

Table 3: Order Codes

(*) Available on request.

Symbol Parameter

Value Unit V I DC Input Voltage -0.3 to 6 (*)V V O DC Output Voltage -0.3 to V I +0.3V V INH INHIBIT Input Voltage -0.3 to V I +0.3V

I O Output Current Internally limited P D Power Dissipation

Internally limited T STG Storage Temperature Range

-65 to 150°C T OP

Operating Junction Temperature Range

-40 to 125

°C Symbol

Parameter

SOT23-5L/TSOT23-5L

Flip-Chip

Unit R thj-case Thermal Resistance Junction-case 81°C/W R thj-amb

Thermal Resistance Junction-ambient

255

170°C/W

SOT23-5L TSOT23-5L Flip-Chip OUTPUT VOLTAGES

LD3985M12R (*)LD3985G12R (*)LD3985J12R (*) 1.20 V LD3985M122R LD3985G122R (*)LD3985J122R 1.22 V LD3985M125R (*)LD3985G125R (*)LD3985J125R 1.25 V LD3985M135R (*)LD3985G135R (*)LD3985J135R 1.35 V LD3985M15R LD3985G15R (*)LD3985J15R (*) 1.5 V LD3985M18R LD3985G18R LD3985J18R 1.8 V LD3985M20R (*)LD3985G20R (*)LD3985J20R (*) 2.0 V LD3985M21R (*)LD3985G21R (*)LD3985J21R (*) 2.1 V LD3985M22R (*)LD3985G22R (*)LD3985J22R (*) 2.2 V LD3985M24R (*)LD3985G24R (*)LD3985J24R 2.4 V LD3985M25R LD3985G25R LD3985J25R 2.5 V LD3985M26R (*)LD3985G26R (*)LD3985J26R 2.6 V LD3985M27R LD3985G27R LD3985J27R 2.7 V LD3985M28R (*)LD3985G28R (*)LD3985J28R 2.8 V LD3985M285R (*)LD3985G285R (*)LD3985J285R (*) 2.85 V LD3985M29R LD3985G29R LD3985J29R 2.9 V LD3985M30R (*)LD3985G30R (*)LD3985J30R 3.0 V LD3985M31R (*)LD3985G31R (*)LD3985J31R 3.1 V LD3985M32R (*)LD3985G32R (*)LD3985J32R (*) 3.2 V LD3985M33R LD3985G33R (*)LD3985J33R 3.3 V LD3985M44R (*)LD3985G44R (*)LD3985J44R (*) 4.4 V LD3985M47R LD3985G47R (*)LD3985J47R 4.7 V LD3985M48R (*)LD3985G48R (*)LD3985J48R 4.8 V LD3985M49R (*)LD3985G49R (*)LD3985J49R (*) 4.9 V LD3985M50R (*)

LD3985G50R (*)

LD3985J50R (*)

5.0 V

LD3985 SERIES

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Figure 2: Connection Diagram (top view for SOT and TSOT, top through view for Flip-Chip)

Table 4: Pin Description

Figure 3: Typical Application Circuit

Pin N°SOT23-5L/TSOT23-5L

Pin N°Flip-Chip

Symbol Name and Function

14V I Input Voltage of the LDO

22GND Common Ground

31V INH Inhibit Input Voltage: ON MODE when V INH ≥ 1.2V, OFF MODE when V INH ≤ 0.4V (Do not leave floating, not internally pulled down/up)

45BYPASS Bypass Pin: Connect an external capacitor (usually 10nF) to minimize noise voltage

5

3

V O

Output Voltage of the LDO

LD3985 SERIES

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Table 5: Electrical Characteristics For LD3985 (T j = 25°C, V I = V O(NOM) +0.5V, C I = 1µF,C BYP = 10nF, I O = 1mA, V INH = 1.4V, unless otherwise specified)

Symbol Parameter

Test Conditions

Min.Typ.

Max.Unit V I Operating Input Voltage 2.56V V O Output Voltage < 2.5V I O = 1 mA -5050mV

T J = -40 to 125°C -7575V O Output Voltage ≥ 2.5V I O = 1 mA -22% of V O(NOM)T J = -40 to 125°C

-33∆V O Line Regulation (Note 1)V I = V O(NOM) + 0.5 to 6 VT J = -40 to 125°C -0.10.1%/V V O = 4.7 to 5V -0.19

0.19∆V O Load Regulation I O = 1 mA to 150mA V O < 2.5V

T J = -40 to 125°C

0.0020.008%/mA ∆V O

Load Regulation

I O = 1 mA to 150mA V O ≥ 2.5V T J = -40 to 125°C (for Flip-Chip)0.00040.002%/mA I O = 1 mA to 150mA, T J = -40 to 125°C (for SOT23-5L/TSOT23-5L), V O ≥ 2.5V

0.00250.005

∆V O Output AC Line Regulation V I = V O(NOM) + 1 V, I O = 150mA,

t R = t F = 30µs 1.5mV PP I Q

Quiescent Current

ON MODE: V INH = 1.2V

I O = 085

µA I O = 0

T J = -40 to 125°C

150

I O = 0 to 150mA 170

I O = 0 to 150mA

T J = -40 to 125°C

250OFF MODE: V INH = 0.4V

0.003

T J = -40 to 125°C

1.5

V DROP

Dropout Voltage (NOTE 1)I O = 1mA

0.4

mV

I O = 1mA T J = -40 to 125°C

2I O = 50mA 20

I O = 50mA T J = -40 to 125°C

35

I O = 100mA 45

I O = 100mA T J = -40 to 125°C

70

I O = 150mA 60

I O = 150mA

T J = -40 to 125°C

100

I SC Short Circuit Current R L = 0

600mA SVR

Supply Voltage Rejection

V I = V O(NOM)+0.25V ±V RIPPLE = 0.1V, I O = 50mA V O(NOM) < 2.5V, V I = 2.55V f = 1KHz 60dB

f = 10KHz 50I O(PK)Peak Output Current V O ≥ V O(NOM) - 5%300

550

mA V INH Inhibit Input Logic Low V I = 2.5V to 6V T J = -40 to

125°C 0.4

V

Inhibit Input Logic High 1.2

I INH Inhibit Input Current V INH = 0.4V V I = 6V

±1nA eN Output Noise Voltage B W = 10 Hz to 100 KHz

C O = 1 µF

30µV RMS t ON Turn On Time (Note 4)C BYP = 10 nF 100250

µs T SHDN

Thermal Shutdown

Note 5

160

°C

LD3985 SERIES

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Note 1 – For V O(NOM) < 2V, V I = 2.5V Note 2 – For V O(NOM) = 1.25V, V I = 2.5V

Note 3 – Dropout voltage is the input-to-output voltage difference at which the output voltage is 100mV below its nominal value. This speci-fication does not apply for input voltages below 2.5V.

Note 4 – Turn-on time is time measured between the enable input just exceeding V INH High Value and the output voltage just reaching 95% of its nominal value

Note 5 – Typical thermal protection hysteresis is 20°C

Note 6 - The minimum capacitor value is 1µF, anyway the LD3985 is still stable if the compensation capacitor has a 30% tolerance in all temperature range.

TYPICAL PERFORMANCE CHARACTERISTICS (T j = 25°C, V

I = V O(NOM) +0.5V, C I = C O = 1µF,C BYP = 10nF, I O = 1mA, V INH = 1.4V, unless otherwise specified)Figure 4: Output Voltage vs Temperature

Figure 5: Output Voltage vs Temperature Figure 6:

Output Voltage vs Temperature

Figure 7: Shutdown Voltage vs Temperature

C O

Output Capacitor

Capacitance (Note 6)122µF ESR

5

5000

m Ω

Symbol Parameter

Test Conditions

Min.Typ.Max.

Unit

LD3985 SERIES

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Figure 8: Shutdown Voltage vs Temperature

Figure 9: Line Regulation vs Temperature Figure 10: Line Regulation vs Temperature Figure 11: Line Regulation vs Temperature

Figure 12: Load Regulation vs Temperature

Figure 13: Load Regulation vs Temperature

Figure 14: Load Regulation vs Temperature Figure 15: Quiescent Current vs Temperature Figure 16: Quiescent Current vs Temperature Figure 17: Quiescent Current vs Temperature Figure 18: Supply Voltage Rejection vs Frequency

Figure 19: Load Transient Response

V I = 3.2V, I O = 1 to 150mA, Rise-Fall time= 1µsec

Figure 20: Line Transient Response

Figure 21: START-UP

Figure 22: TURN-OFF

V I = 3.8V to 4.4V, T J = 25°C, I O = 150mA, C I = C O = 1µF (X7R), C BYP = 10nF, Rise-Fall time = 1µsec, V O = 2.7V V I = 3.3V, I O = 1mA, C I = C O = 1µF (cer), C BYP = 10nF, T r = 20ns, V O = 2.8V

V I = 3.3V, I O = 1mA, C I = C O = 1µF (cer), C BYP = 10nF, T f = 20ns, V O = 2.8V

DIM.

MIN.TYP MAX.MIN.TYP.MAX. A0.90 1.4535.457.1 A10.000.100.0 3.9 A20.90 1.3035.451.2 b0.350.5013.719.7 C0.090.20 3.57.8

D 2.80 3.00110.2118.1

E 1.50 1.7559.068.8 e0.9537.4

H 2.60 3.00102.3118.1 L0.100.60 3.923.6

.

7049676Cmm.mils

DIM.

MIN.TYP MAX.MIN.TYP.MAX.

A 1.143.3 A100.1 3.9 A20.7 1.027.639.4 b0.30.511.819.7 C0.080.2 3.17.9

D 2.9114.2

E 2.8110.2

E1 1.663.0

e0.9537.4

e1 1.974.8

L0.30.611.823.6

7282780BFlip-Chip5 MECHANICAL DATA

mm.mils

DIM.

MIN.TYP MAX.MIN.TYP.MAX. A0.8350.90.96532.87435.43337.992 A10.210.250.298.26.84311.417 A20.6250.650.67524.60625.59126.575 b0.2650.3150.36510.43312.40214.370

D 1.510 1.540 1.57059.44960.63061.811

E 1.16 1.19 1.2245.66946.85048.031 e0.450.50.5517.71719.68521.654 e10.8160.8660.91632.12634.09436.063 f0.34513.583

f10.33713.268

LD3985 SERIES Table 6: Revision History

Date Revision Description of Changes 07-May-20046Part Number Status Changed on Table 3.

05-Oct-20047t ON values are Changed on Table 5.

27-Oct-20048Order Codes changed - Table 3.

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