L432ISCT [MICROSEMI]

Two Terminal Voltage Reference, 1 Output, Trim/Adjustable, PDSO3, PLASTIC, SOT-23, 3 PIN;


型号：	L432ISCT
厂家：	Microsemi
描述：	Two Terminal Voltage Reference, 1 Output, Trim/Adjustable, PDSO3, PLASTIC, SOT-23, 3 PIN 光电二极管
文件：	总8页 (文件大小：155K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

LX432

LOW VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATORS

T H E I N F I N I T E P O W E R O F I N N O V A T I O N

P R O D U C T I O N D A T A S H E E T

DESCRIPTION

KEY FEATURES

Low Voltage Operation: 1.24V Reference

Initial Voltage Reference Accuracy 1%

Adjustable Output Voltage From V_REFTo 20V

Typical Output Dynamic Impedance Less

Than 250mΩ

Sink Current Capability 80µA To 20mA

Direct Alternative To TLV431

The LX432 series are low-voltage pre-

cision adjustable shunt regulators

with a reference voltage of 1.24V. The

output voltage may be set to any value

between 1.24V and 20V by two external

resistors.

These devices offer low output im-

pedance for improved load regula-

tion — typical output impedance is

250mΩ. The LX432 series operates with

an operating current as low as 80µA,

making these devices suitable for por-

table and micropower applications.

Low voltage operation enables the

LX432 to be used in the feedback loop

of isolated low voltage power sup-

plies. The minimum output voltage is

determined by the LX432 output voltage

plus the forward voltage drop of the

opto-coupler LED (typically 1.24 + 1.4 =

2.64V minimum). See Figure 10.

The LX432 is offered in 3 and 5-pin

SOT-23 or TO-92 packages, and is a drop-

in replacement for the TLV431 and

SC431L devices.

APPLICATIONS

Low Voltage Adjustable Power Supplies

Instrumentation

Computers

Portable Equipment

IMPORTANT: For the most current data, consult LinFinity's web site: http://www.linfinity.com.

PRODUCT HIGHLIGHT

TY P I C A L PR O G R A M M A B L E VO LTA G E

RE F E R E N C E CI R C U I T

V_IN

V_KA

Cathode

LX432

Reference

Anode

GND

PACKAGE ORDER INFORMATION

Plastic SOT-23

3-pin

Plastic SOT-23

5-pin

Plastic TO-92

T_A(°C)

3-pin

LX432CLP

LX432ILP

0 to 70

LX432CSC

LX432ISC

LX432CSE

LX432ISE

-40 to 85

Note: All surface-mount packages are available in Tape & Reel.

Append the letter "T" to part number. (i.e. LX432CSET)

TO-92 (LP) package also available in ammo-pack.

L I N F I N I T Y M I C R O E L E C T R O N I C S I N C .

11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570

Rev. 1.0 9/99

P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7

LX432

LOW VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATORS

P R O D U C T I O N D A T A S H E E T

ABSOLUTE MAXIMUM RATINGS (Note 1)

PACKAGE PIN OUTS

Cathode to Anode Voltage (V_KA)................................................................. -0.3V to +20V

Reference Input Current (I_REF) .................................................................... -50µA to 10µA

Continuous Cathode Current (I_K) ............................................................. -25mA to 25mA

Operating Junction Temperature

Plastic (SC, SE & LP Packages) ............................................................................. 150°C

Storage Temperature Range ...................................................................... -65°C to 150°C

Lead Temperature ..................................................................................................... 300°C

CATHODE

REF

ANODE

SC PACKAGE — 3-Pin

Note 1. Exceeding these ratings could cause damage to the device. All voltages are with respect

to Ground. Currents are positive into, negative out of the specified terminal. Pin

numbers refer to DIL packages only.

(Top View)

N.C.

ANODE

REF

THERMAL DATA

SC PACKAGE:

CATHODE

Thermal Resistance - Junction to Ambient, θ_JA(PC-Mounted)

(Non-PC Mounted)

220°C/W

410°C/W

SE PACKAGE — 5-Pin

SE PACKAGE:

(Top View)

Thermal Resistance - Junction to Ambient, θ_JA(PC-Mounted)

220°C/W

410°C/W

(Non-PC Mounted)

LP PACKAGE:

3. CATHODE

Thermal Resistance-Junction to Ambient, θ_JA

156°C/W

2. ANODE

1. REF

Junction Temperature Calculation: T_J= T_A+ (P_Dx θ_JA).

The θ_JAnumbers are guidelines for the thermal performance of the device/pc-board system.

All of the above assume no ambient airflow

LP PACKAGE

(Top View)

BLOCK DIAGRAM

Cathode (K)

Ref (R)

V_REF

Anode (A)

Rev. 1.0 9/99

P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7

LX432

LOW VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATORS

P R O D U C T I O N D A T A S H E E T

ELECTRICAL CHARACTERISTICS

(Unless otherwise specified, these specifications apply over the operating ambient temperatures for LX432C with 0°C ≤ T_A≤ 70°C, and the LX432I

with -40°C ≤ T_A≤ 85°C.)

LX432

Min. Typ. Max.

Parameter

Symbol

Test Conditions

Units

Reference Voltage

V_REF

I_K= 10mA, V_KA= V_REF, T_A= 25°C

1.228 1.24 1.252

Reference Voltage Drift (Note 2)

∆V_REF

I_K= 10mA, V_KA= V_REF, 0°C ≤ T_A≤ 70°C

I_K= 10mA, V_KA= V_REF, -40°C ≤ T_A≤ 85°C

I_K= 10mA, V_KA= V_REFto 16V, T_A= 25°C

-1

-2.7

mV/V

Ratio Of V_REFChange In Cathode

Voltage Change (Note 3)

Reference Terminal Current

Reference Current Drift (Note 2)

∆V_REF

∆V_KA

I_REF

I_K= 10mA, V_KA= V_REF, T_A= 25°C, R1=10kΩ, R2 = Open

I_K= 10mA, V_KA= V_REF, 0°C ≤ T_A≤ 70°C

I_K= 10mA, V_KA= V_REF, -40°C ≤ T_A≤ 85°C

0.1

0.05

0.1

0.2

0.5

0.3

0.4

µA

Ω

∆I_REF

Minimum Cathode Current For Regulation

Dynamic Impedance

Off-state Cathode Current

I_{K (MIN)}V_KA= V_REF, T_A= 25°C

Z_KA

I_OFF

I_K= 0.1mA to 15mA, V_KA= V_REF, T_A= 25°C

V_KA= 16V, T_A= 25°C

0.4

0.004

µA

Note 2. These parameters are guaranteed by design.

∆V_REF

Note 3.

Ratio of change in reference input voltage

to the change in cathode voltage.

∆V_KA

Rev. 1.0 9/99

P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7

LX432

LOW VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATORS

P R O D U C T I O N D A T A S H E E T

GRAPH / CURVE INDEX

FIGURE INDEX

Characteristic Curves

Parameter Measurement Information

FIGURE #

1. Reference Voltage vs. Junction Temperature

2. Reference Current vs. Junction Temperature

3. Cathode Current vs. Cathode Voltage

9. Test Circuit For V_KA= V_REF

10. Test Circuit For V_KA> V_REF

11. Test Circuit For I_OFF

4. ∆V_REF/ ∆V_KAvs. Junction Temperature

5. Dynamic Impedance vs. Junction Temperature

Typical Applications

6. Minimum Cathode Current For Regulation vs. Junction

FIGURE #

Temperature

12. Flyback With Isolation Using LX431 Or LX431A As Voltage

7. Off-State Current vs. Junction Temperature

8. Equivalent Input Noise Voltage vs. Frequency

Reference And Error Amplifier

13. LX432 In 3.3V To 2.7V Low Dropout Regulator Application

Rev. 1.0 9/99

P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7

LX432

LOW VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATORS

P R O D U C T I O N D A T A S H E E T

CHARACTERISTIC CURVES

1.25

1.245

1.24

0.2

0.16

0.12

0.08

0.04

1.235

1.23

-40 -30 -20 -10

10 20 30 40 50 60 70 80 90

-40 -30 -20 -10

10 20 30 40 50 60 70 80 90

T_J: Junction Temperature ( C)

FIGURE 1 — Reference Voltage vs. Junction Temperature

FIGURE 2 — Reference Current vs. Junction Temperature

800

700

600

500

400

300

200

100

-1.200

-1.000

-0.800

-0.600

-0.400

-0.200

-100

-200

-1

-0.5

T_J: Junction Temperature (V)

FIGURE 3 — Cathode Current vs. Cathode Voltage

0.5

1.5

-40 -30 -20 -10

10 20 30 40 50 60 70 80 90

T_J: Junction Temperature ( C)

FIGURE 4 — ∆V_REF/ ∆V_KAvs. Junction Temperature

Rev. 1.0 9/99

P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7

LX432

LOW VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATORS

P R O D U C T I O N D A T A S H E E T

CHARACTERISTIC CURVES

1.000

0.800

0.600

0.400

0.200

0.000

120

100

-40 -30 -20 -10

10 20 30 40 50 60 70 80 90

-40 -30 -20 -10

10 20 30 40 50 60 70 80 90

T_J: Junction Temperature ( C)

FIGURE 5 — Dynamic Impedance vs. Junction Temperature

FIGURE 6 — Minimum Cathode Current for Regulation

vs. Junction Temperature

0.012

0.010

0.008

0.006

0.004

0.002

0.000

350

300

250

200

150

-40 -30 -20 -10

10 20 30 40 50 60 70 80 90

100

10K

100K

T_J: Junction Temperature ( C)

Frequency (Hz)

FIGURE 7 — Off-State Current vs. Junction Temperature

FIGURE 8 — Equivalent Input Noise Voltage vs. Frequency

Rev. 1.0 9/99

P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7

LX432

LOW VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATORS

P R O D U C T I O N D A T A S H E E T

PARAMETER MEASUREMENT INFORMATION

V_KA

Input

V_KA

Input

I_K

R₁

R₂

I_REF

V_REF

FIGURE 10 — Test Circuit For V_KA> V_REF

FIGURE 9 — Test Circuit For V_KA= V_REF

V_KA

Input

I_OFF

FIGURE 11 — Test Circuit For I_OFF

Rev. 1.0 9/99

P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7

LX432

LOW VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATORS

P R O D U C T I O N D A T A S H E E T

TYPICAL APPLICATION

V_IN

110/220V AC

V_OUT

3.3V

DRV

V_CC

Controller

UC384x/LX155x

I_SENSE

V_FB

GND

LX432

FIGURE 12 — LX432 In A Power Supply Isolated Feedback Application

(

)

FIGURE 13 — LX432 In 3.3V To 2.7V Low Dropout Regulator Application

PRODUCTIONDATA-InformationcontainedinthisdocumentisproprietarytoLinFinity, andiscurrentasofpublicationdate. Thisdocument

may not be modified in any way without the express written consent of LinFinity. Product processing does not necessarily include testing of

all parameters. Linfinity reserves the right to change the configuration and performance of the product and to discontinue product at any time.

Rev. 1.0 9/99

L432ISCT [MICROSEMI]

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