Datasheet IMP37-33JST, IMP37-33JCM, IMP37-30JST, IMP37-25JST, IMP37-30JCM Datasheet (IMP)

©

1999 IMP, Inc. 408-432-9100/www.impweb.com 1

Key Features

Applications

◆ High-efficiency linear power supplies

◆ Post regulator for switching supplies

◆ 5V to 3.3V linear regulators

◆ USB hubs

◆ Battery chargers

◆ Routers, ISDN/DSL modems

◆

Low Dropout Voltage
– 0.8V maximum at 100mA
– 0.95V maximum at 800mA
– 20% lower dropout voltage than “1117”

LDO regulators

◆

Guaranteed Low Dropout Voltage at Multiple
Current Levels

◆

1% Trimmed 2.5V, 3.0V and 3.3V Outputs

◆

Reduced Quiescent Current: 75µA Maximum

◆

Short Circuit and Thermal Protection

◆

Space Saving SOT-223 Surface Mount Package

◆

“1117” Pin Compatible

Block Diagram

IMP3

IMP377

POWER MANAGEMENT

Lo

Lo

w Dr

w Dr

opout P

opout P

ositiv

ositive e

VVolt

oltagag

e R

e R

egulat

egulatororss

– 800mA

– 800mA

– 2.5V

– 2.5V

, 3.0V and 3.3V Output

, 3.0V and 3.3V Output

The IMP37 series of Low Dropout (LDO) three-terminal voltage regula­tors feature guaranteed low dropout voltages at currents up to 0.8A. The
IMP37 regulator family dropout voltage is guaranteed to be 0.95V or
lower at 0.8A. At 100mA, the maximum dropout voltage is 0.8V.
Compared with “1117” type LDOs, the IMP37 has a 20% lower dropout
voltage.

Three fixed output voltages are offered: 2.5V, 3.0V and 3.3V. Output volt­ages are factory trimmed to within 1% of the nominal value.

In addition to low dropout voltages, the IMP37 family features greatly

reduced quiescent operating current. The 75µA maximum specification

represents an over 100 times improvement over competitive devices.

Devices are short circuit protected, and a thermal protection circuit shuts
the regulator off should the junction temperature exceed 165°C.

The IMP37 is available in low-profile plastic SOT-223 and TO-263
packages and are pin compatible with fixed “1117” devices.

R

Input

3

CS

Current

Limit

2

Out
(Tab)

IMP37

Error

+

–

Thermal

Protection

Amp

–

+

+

Ref

–

1

GND

37_01.eps

2

408-432-9100/www.impweb.com

©

1999 IMP, Inc.

Pin Configuration

IMP3

IMP377

Pin Descriptions

Package Marking Code

Ordering Information

IMP37

37_05.eps

GND

INPUT

1

3

OUT

TAB IS V

OUT

2

SOT-223 TO-263

Front View Front View

rebmuNtraPegakcaP

eciveD

gnikraM

TSJ52-73PMI322-TOS5273
TSJ03-73PMI322-TOS0373
TSJ33-73PMI322-TOS3373

MCJ52-73PMI362-OTMCJ5273
MCJ03-73PMI362-OTMCJ0373
MCJ33-73PMI362-OTMCJ3373

spe.50elbaT_73

snoitpOtuptuOrebmuNgniredrOtraP

egatloV

mumixaM

tnerruCtnecseiuQ

taegatloVtuoporD

Am008

322-TOS
egakcaP

362-OT

egakcaP

V5.257µAV59.0TSJ52-73PMIMCJ52-73PMI
V0.357µAV59.0TSJ03-73PMIMCJ03-73PMI

V3.357µAV59.0TSJ33-73PMIMCJ33-73PMI

spe.60t_73

Note: Tape and reel shipping is available for the SOT-223 and TO-263 packages. Append the TAPE AND REEL designation “/T” to the ordering

part number for tape and reel devices. For example, the IMP37-25JST/T is a 2.5V SOT-223 packaged device shipped in reels.

rebmuNniPemaNnoitcnuF

1DNGniPdnuorG
2TUOegatloVtuptuO
3TUPNIegatloVtupnI

BATBATegatloVtuptuO

spe.30elbaT_73

INPUT

3

TAB IS V

OUT

IMP37

OUT2

GND

1

37_04.eps

©

1999 IMP, Inc. 408-432-9100/www.impweb.com 3

IMP3

IMP377

Absolute Maximum Ratings

Electrical Characteristics

Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . 7V

Operating Junction Temperature . . . . . . . . . 0°C to 150°C

Storage Temperature Range . . . . . . . . . . . . . –65°C to +150°C

Lead Temperature (Soldering) . . . . . . . . . . . . . 300°C for 10 seconds

These are stress ratings only and functional operation is not implied.
Exposure to absolute maximum ratings for prolonged time periods may
affect device reliability. All voltages are with respect to ground.

Specifications apply over the junction operating temperature range of T

J

= 0°C to +125°C unless otherwise noted.

Notes: 1. See thermal regulation specification for changes in output voltage due to heating effects. Load regulation and line regulation

are measured with low duty cycle pulse testing to maintain a constant junction temperature.

2. Dropout voltage is specified over the full output current range. Dropout voltage is defined as the minimum input/output
differential measured at the specified output current.

3. Minimum load current is defined as the minimum output current required to maintain regulation.

retemaraPlobmySxiffuSsnoitidnoCniMpyTxaMstinU

egatloVtuptuOV

TUO

52–I

TUO

V,Am01=

NI

T,V58.4=

J

52=C°574.25.2525.2V

Am01≤I

TUO

≤I

XAM

V52.4,≤V

NI

≤V5.554.25.255.2

03–

I

TUO

V,Am01=

NI

T,V5=

J

52=C°79.200.330.3

Am01≤I

TUO

≤I

XAM

V57.4,≤V

NI

≤V5.549.200.360.3

33–I

TUO

V,Am01=

NI

T,V5=

J

52=C°762.303.3333.3

Am01≤I

TUO

≤I

XAM

V57.4,≤V

NI

≤V5.5532.303.3563.3

noitalugeReniL

)1etoN(

52–I

TUO

V52.4,Am01= (≤VNI)≤V5.52191

Vm

03–I

TUO

V5.4,Am01= ≤VNI≤V5.52191

33–I

TUO

V5.4,Am01= ≤VNI≤V5.52191

noitalugeReniL

)1etoN(

52–I

TUO

V52.4,Am01= (≤VNI)≤T,V5.5

A

52=C°8.23.4

Vm

03–I

TUO

V5.4,Am01= ≤VNI≤T,V5.5

A

52=C°8.23.4

33–I

TUO

V5.4,Am01= ≤VNI≤T,V5.5

A

52=C°8.23.4

noitalugeRdaoL

)1etoN(

52–V

NI

Am5,V52.4= ≤I

TUO

≤Am0085203Vm

03–V

NI

Am5,V57.4= ≤I

TUO

≤Am0085203

33–V

NI

Am5,V57.4= ≤I

TUO

≤Am0085203

egatloVtuoporD

)2etoN(

xx–

I

TUO

Am001=8.0V

I

TUO

Am008=59.0

timiLtnerruCI

)XAM(TUO

xx–T

J

52=C°0080590021Am

tnerruCdaoLmuminiMxx– 0.5Am

tnerruCtnecseiuQI

Q

xx–VNI≤V66357

µA

noitalugeRlamrehTT

A

52=C°esluPsm03,10.01.0W/%

noitcejeRelppiRf

ELPPIR

V,zH021=

NI

T,V5=

A

52=C°

V

ELPPIR

I,p-pV1=

DAOL

Am01=

1545Bd

ytilibatSerutarepmeT 5.0%

ytilibatSmreTgnoLT

A

521=C°srH0001,3.0%

esioNtuptuOSMRVfo%(

TUO

zH01,)≤f≤T,zHk01

J

52=C°300.0%

ecnatsiseRlamrehT )322-OT(BATtaesaC-ot-noitcnuJ51°W/C

)362-OT(BATtaesaC-ot-noitcnuJ01

spe.70t_73

4

408-432-9100/www.impweb.com

©

1999 IMP, Inc.

IMP3

IMP377

Application Information

The IMP37 voltage regulator ICs offer self-protection features
which include short-circuit current protection and automatic thermal
shutdown (for junction temperature above 165°C).

Circuit Stability

Like all regulators, an output filter capacitor is required for circuit sta­bility. Besides smoothing the output, the output capacitor
“completes” the regulator’s frequency compensation. The ESR of the

output capacitor should be less than 0.5Ω. Low ESR capacitors are

preferred.

Table 1 shows recommended minimum capacitance values for both
aluminum and tantalum capacitors. Larger values of output capaci­tance do not cause stability problems.

Table 1. Recommended Output Bypass Capacitors

An input bypass capacitor is recommended. A 10µF or larger tanta-

lum capacitor is suitable for most applications.

Figure 1. Fixed 3.3V Regulator

Thermal Management

The maximum operating junction temperature for the IMP37 devices
is 150°C. The junction temperature can be calculated when the
power dissipation and ambient temperature are known with this
equation: T

J

= TA+ (P

D

x Θ

JA

).

The thermal resistance from juntion-to-ambient (Θ

JA

) is the sum of

the three thermal resistances:

Θ

JA

= ΘJT+ ΘTS+ Θ

SA

Where Θ

JT

= Junction-to-Tab thermal resistance

Θ

TS

= Tab-to-Heat Sink thermal resistance

Θ

SA

= Heat Sink-to-Air thermal resistance

Table 2. Thermal Resistance of Packages

The IMP37 series devices have thermal limiting circuitry to protect
the device from over current. For continuous operation, the maxi­mum junction temperature rating must not be exceeded.

epyTegakcaP

ecnatsiseRlamrehT

,baTotnoitcnuJ Θ

TJ

322-TOS 51 ° W/C

362-OT 01 ° W/C

IMP37

OUTV

IN

* **

IN 3.3V

37_02.eps

GND

* Min. 15µF Tantalum or 100µF Aluminum.
Capacitor May Be Increased Without Limit.

** 10µF Tantalum or 100µF Aluminum

++

5.0<RSE(roticapaCssapyBtuptuO Ω)

01 µ 001,mulatnaTF µ munimulAF

IMP3

IMP377

©

1999 IMP, Inc. 408-432-9100/www.impweb.com 5

Package Dimensions

Plastic SOT-223 (4-Pin)

E

A

e1

A1

C

H

e

D

S

B1

B

Q2

Q1

Q

SOT-223 (4-Pin).eps

TO-263 (3-Pin)

D

L

E

e

B2

B

A

L2

C2

L1

C

0° - 8°

TO-263 (3-Pin).eps

sehcnI sretemilliM

niM xaM niM xaM

*)niP-4(322-TOScitsalP

A 760.0 060.0 07.1 05.1

1A 400.0 8000.0 01.0 20.0

B 421.0 611.0 51.3 59.2

1B 330.0 620.0 58.0 56.0
C 410.0 010.0 53.0 52.0
D 462.0 842.0 07.6 03.6
e MON5090.0 MON03.2

1e MON181.0 MON05.4
E 641.0 031.0 07.3 03.3
h 782.0 462.0 03.7 07.6
S 140.0 330.0 50.1 58.0

t 150.0 340.0 03.1 01.1

Q XAM°01 XAM°01

1Q °61 °01 °61 °01

2Q °61 °01 °61 °01

**)niP-3(362-OT

A 061.0 091.0
B 020.0 930.0

2B 540.0 550.0
C 810.0 920.0

2C 540.0 550.0
D 043.0 083.0
E 083.0 504.0
e CSB001.0
L 575.0 526.0

1L 090.0 011.0

2L ——— 550.0

AA162-OTgniwarDCEDEJ*
AA362-OTgniwarDCEDEJ**

♦

.leeRdnaepaTrofrebmuNtraPotT/ddA

spe.40elbaT_73

IMP3

IMP377

IMP, Inc.
Corporate Headquarters
2830 N. First Street
San Jose, CA 95134-2071
Tel: [phone]
Tel: [phone]
Fax: [phone]
Fax-on-Demand: 1-800-249-1614 (USA)
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e-mail: [e-mail]
http://www.impweb.com

The IMP logo is a registered trademark of IMP, Inc.

All other company and product names are trademarks of their respective owners.

© 1999 IMP, Inc.
Printed in USA
Publication #: 8002
Revision: C
Issue Date: 07/22/99
Type: Preliminary