LD3985XX15 [ETC]

ULTRA LOW DROP LOW NOISE BICMOS VOLTAGE REGULATORS LOW ESR CAPACITORS COMPATIBLE ; 超低压降低噪声BICMOS稳压器低ESR电容兼容\n


型号：	LD3985XX15
厂家：	ETC
描述：	ULTRA LOW DROP LOW NOISE BICMOS VOLTAGE REGULATORS LOW ESR CAPACITORS COMPATIBLE 超低压降低噪声BICMOS稳压器低ESR电容兼容\n 稳压器信息通信管理
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LD3985

SERIES

ULTRA LOW DROP-LOW NOISE BICMOS VOLTAGE

REGULATORS LOW ESR CAPACITORS COMPATIBLE

■

INPUT VOLTAGE FROM 2.5V TO 6V

STABLE WITH LOW ESR CERAMIC

CAPACITORS

■

ULTRA LOW DROPOUT VOLTAGE (100mV

TYP. AT 150mA LOAD, 0.4mV TYP. AT 1mA

LOAD)

VERY LOW QUIESCENT CURRENT (85µA

TYP. AT NO LOAD, 170µA TYP. AT 150mA

LOAD; MAX 1.5µA IN OFF MODE)

GUARANTEED OUTPUT CURRENT UP TO

150mA

WIDE RANGE OF OUTPUT VOLTAGE:

1.25V; 1.35; 1.5; 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

Flip-Chip

(1.57x1.22)

SOT23-5L

■

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.

■

FAST TURN-ON TIME: TYP. 200µs [C =1µF,

= 10nF AND I =1mA]

BYP

LOGIC-CONTROLLED ELECTRONIC

SHUTDOWN

INTERNAL CURRENT AND THERMAL LIMIT

OUTPUT LOW NOISE VOLTAGE 30µVRMS

OVER 10Hz to 100KHz

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

TEMPERATURE RANGE: -40°C TO 125°C

■

DESCRIPTION

The LD3985 provides up to 150mA, from 2.5V to

6V input voltage.

SCHEMATIC DIAGRAM

July 2003

1/12

LD3985 SERIES

ABSOLUTE MAXIMUM RATINGS

Symbol

Parameter

Value

Unit

DC Input Voltage

DC Output Voltage

INHIBIT Input Voltage

Output Current

-0.3 to 6 (*)

-0.3 to V +0.3

INH

Internally limited

-65 to 150

Power Dissipation

Storage Temperature Range

°C

STG

Operating Junction Temperature Range

-40 to 125

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.

THERMAL DATA

Symbol

Parameter

Thermal Resistance Junction-case

Thermal Resistance Junction-ambient

SOT23-5L

Flip-Chip

Unit

°C/W

thj-case

255

170

thj-amb

CONNECTION DIAGRAM (top view for SOT, top through view for Flip-Chip)

SOT23-5L

Flip-Chip

PIN DESCRIPTION

Pin N°

SOT23-5L Flip-Chip

Pin N°

Symbol

Name and Function

Input Voltage of the LDO

GND

Common Ground

Inhibit Input Voltage: ON MODE when V

≥ 1.2V, OFF MODE when V

≤

INH

0.4V (Do not leave floating, not internally pulled down/up)

BYPASS

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

voltage

Output Voltage of the LDO

2/12

LD3985 SERIES

ORDERING CODES

SOT23-5L

Flip-Chip

OUTPUT VOLTAGES

LD3985M125R

LD3985M135R

LD3985M15R

LD3985M18R

LD3985M20R

LD3985M21R

LD3985M22R

LD3985M24R

LD3985M25R

LD3985M26R

LD3985M27R

LD3985M28R

LD3985M285R

LD3985M29R

LD3985M30R

LD3985M31R

LD3985M32R

LD3985M33R

LD3985M47R

LD3985M48R

LD3985M49R

LD3985M50R

LD3985J125R

LD3985J135R

LD3985J15R

LD3985J18R

LD3985J20R

LD3985J21R

LD3985J22R

LD3985J24R

LD3985J25R

LD3985J26R

LD3985J27R

LD3985J28R

LD3985J285R

LD3985J29R

LD3985J30R

LD3985J31R

LD3985J32R

LD3985J33R

LD3985J47R

LD3985J48R

LD3985J49R

LD3985J50R

1.25 V

1.35 V

1.5 V

1.8 V

2.0 V

2.1 V

2.2 V

2.4 V

2.5 V

2.6 V

2.7 V

2.8 V

2.85 V

2.9 V

3.0 V

3.1 V

3.2 V

3.3 V

4.7 V

4.8 V

4.9 V

5.0 V

TYPICAL APPLICATION CIRCUIT

3/12

LD3985 SERIES

ELECTRICAL CHARACTERISTICS FOR LD3985 (T = 25°C, V = V

+0.5V, C = 1µF,

O(NOM)

= 10nF, I = 1mA, V = 1.4V, unless otherwise specified)

INH

BYP

Symbol

Parameter

Test Conditions

Min.

2.5

Typ.

Max.

Unit

Operating Input Voltage

Output Voltage

= 1 mA

-2

-3

% of

O(NOM)

T = -40 to 125°C

∆V

Line Regulation (Note 1)

Load Regulation

-0.1

-0.19

0.1

0.19

%/V

V = V

+ 0.5 to 6 VT = -40 to 125°C

O(NOM)

= 4.7 to 5V

= 1 mA to 150mA (for Flip Chip)

0.0004 0.002

%/mA

T = -40 to 125°C

0.0025 0.005

1.5

= 1 mA to 150mA, T = -40 to 125°C

(for SOT23-5L)

Output AC Line Regulation V = V + 1 V, I = 150mA,

∆V

O(NOM)

t = t = 30µs

Quiescent Current

ON MODE: V = 1.2V

= 0

µA

INH

150

170

250

= 0

T = -40 to 125°C

= 0 to 150mA

T = -40 to 125°C

OFF MODE: V

= 0.4V

0.003

1.5

INH

T = -40 to 125°C

Dropout Voltage (NOTE 1)

= 1mA

0.4

DROP

= 1mA

T = -40 to 125°C

= 50mA

= 100mA

= 150mA

= 0

100

600

T = -40 to 125°C

Short Circuit Current

SVR Supply Voltage Rejection V = V

+0.25V ±

f = 1KHz

O(NOM)

= 0.1V, I = 50mA

f = 10KHz

RIPPLE

< 2.5V,

V = 2.55V

O(NOM)

Peak Output Current

≥ V - 5%

O(NOM)

300

1.2

550

0.4

O(PK)

Inhibit Input Logic Low

Inhibit Input Logic High

Inhibit Input Current

V = 2.5V to 6V

T = -40 to 125°C

INH

= 0.4V

V = 6V

±1

INH

Output Noise Voltage

Turn On Time (Note 4)

Thermal Shutdown

Output Capacitor

= 10 Hz to 100 KHz

= 1 µF

µV

RMS

= 10 nF

BYP

200

160

µs

Note 5

°C

SHDN

Capacitance (Note 6)

ESR

µF

5000

mΩ

Note 1 – For V

Note 2 – For V

< 2V, V = 2.5V

O(NOM)

= 1.25V, V = 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

of its nominal value

High Value and the output voltage just reaching 95%

INH

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.

4/12

LD3985 SERIES

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

+0.5V, C = C = 1µF,

I O

O(NOM)

= 10nF, I = 1mA, V

= 1.4V, unless otherwise specified)

BYP

INH

Figure 1 : Output Voltage vs Temperature

Figure 2 : Output Voltage vs Temperature

Figure 3 : Output Voltage vs Temperature

Figure 4 : Shutdown Voltage vs Temperature

Figure 5 : Shutdown Voltage vs Temperature

Figure 6 : Line Regulation vs Temperature

5/12

LD3985 SERIES

Figure 7 : Line Regulation vs Temperature

Figure 10 : Load Regulation vs Temperature

Figure 11 : Load Regulation vs Temperature

Figure 12 : Quiescent Current vs Temperature

Figure 8 : Line Regulation vs Temperature

Figure 9 : Load Regulation vs Temperature

6/12

LD3985 SERIES

Figure 13 : Quiescent Current vs Temperature

Figure 16 : Load Transient Response

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

Figure 14 : Quiescent Current vs Temperature

Figure 17 : Line Transient Response

V = 3.8V to 4.4V, T = 25°C, I = 150mA, C = C = 1µF (X7R),

BYP

= 10nF, Rise-Fall time = 1µsec, V = 2.7V

Figure 15 : Supply Voltage Rejection vs

Figure 18 : START-UP

Frequency

V = 3.3V, I = 1mA, C = C = 1µF (cer), C

= 10nF, T = 20ns,

BYP

= 2.8V

7/12

LD3985 SERIES

Figure 19 : TURN-OFF

V = 3.3V, I = 1mA, C = C = 1µF (cer), C

= 10nF, T = 20ns,

BYP

= 2.8V

8/12

LD3985 SERIES

SOT23-5L MECHANICAL DATA

mm.

mils

DIM.

MIN.

0.90

0.00

0.90

0.35

0.09

2.80

1.50

TYP

MAX.

1.45

0.10

1.30

0.50

0.20

3.00

1.75

MIN.

35.4

0.0

TYP.

MAX.

57.1

3.9

35.4

13.7

3.5

51.2

19.7

7.8

110.2

59.0

118.1

68.8

0.95

37.4

2.60

0.10

3.00

0.60

102.3

3.9

118.1

23.6

7049676C

9/12

LD3985 SERIES

Flip-Chip5 MECHANICAL DATA

mm.

mils

TYP.

DIM.

MIN.

0.835

0.21

TYP

0.9

MAX.

0.965

0.29

MIN.

MAX.

37.992

11.417

26.575

14.370

61.811

48.031

21.654

36.063

32.874

8.268

35.433

0.25

0.65

0.315

1.540

1.19

0.5

9.843

25.591

12.402

60.630

46.850

19.685

34.094

13.583

13.268

0.625

0.265

1.510

1.16

0.675

0.365

1.570

1.22

24.606

10.433

59.449

45.669

17.717

32.126

0.45

0.55

0.816

0.866

0.345

0.337

0.916

10/12

LD3985 SERIES

Tape & Reel SOT23-xL MECHANICAL DATA

mm.

TYP

inch

TYP.

DIM.

MIN.

MAX.

180

MIN.

MAX.

7.086

0.519

12.8

20.2

13.0

13.2

0.504

0.795

2.362

0.512

14.4

3.33

3.27

1.47

4.1

0.567

0.131

0.128

0.0.58

0.161

3.13

3.07

1.27

3.9

3.23

3.17

1.37

4.0

0.123

0.120

0.050

0.153

0.127

0.124

0.054

0.157

3.9

4.0

4.1

11/12

LD3985 SERIES

Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the

consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from

its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications

mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information

previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or

systems without express written approval of STMicroelectronics.

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12/12

LD3985XX15 [ETC]

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