Datasheet IMP38HC45ESD, IMP38HC45EPD, IMP38HC45EPA, IMP38HC42ESD, IMP38HC42ESA Datasheet (IMP)

© 2000 IMP, Inc. 408-432-9100/www.impweb.com 1

IMP38C/HC/42/3/4/5

IMP38C/HC/42/3/4/5

POWER MANAGEMENT

Key Features

◆

384x Series Pinout with BiCMOS Technology

◆

Zero Cross-Conduction Current by Design

◆

1MHz Operation

◆

65ns Maximum Current-Sense Delay

◆

120µA Maximum Start-Up Current

◆

1.5mA Maximum Operating Current

◆

High Output Current Drive
– 1.0A, IMP38HC4x
– 0.5A, IMP38C4x

◆

20V Maximum Supply Voltage

◆

2.5V, 1%, Trimmed Error Amplifier Reference

◆

Trimmed Oscillator Discharge Current

◆

Pin-for-Pin Enhanced Replacements for Micrel
MIC38C/HC4x and GMT38C4x/HC4x

Block Diagrams

BiCMOS Cur

BiCMOS Currr

ent-Mode

ent-Mode

PWM Contr

PWM Contr

oller

ollerss

– – 1MHz Oper

1MHz Oper

ation

ation

– – NNo Cr

o Crososss--

Conduction Cur

Conduction Currr

ent

ent

– – 50ns Cur

50ns Currr

ent-Sense Dela

ent-Sense Delayy

The IMP38C4x and IMP38HC4x are fixed frequency, high performance,
current-mode PWM controllers that are pin compatible with bipolar 384x
devices but feature improvements resulting from IMP’s BiCMOS
processing and circuit design. Notable among the improvements are zero
cross-conduction/shoot-through current, reduced start-up and operating
current, lower current-sense delay, higher frequency operation, full
supply voltage swing at the output and a 1% trimmed voltage reference.

IMP38C4x and IMP38HC4x output driver stage has zero cross-conduction
current. A proprietary output state-machine monitors each output
MOSFET and guarantees by design zero cross-conduction current. This is
an industry first for 384x PWM devices.

Under-voltage lockout (UVL) performance has been improved. When
the power supply voltage is below the startup voltage, internal circuitry
puts the output into a low impedance state. The output will sink 20mA
and remain below 1.3V, well below the turn-on threshold voltage of the
external MOSFET. Even when V

DD

drops to zero volts, the out pin will

not rise above approximately 1.3V because the output UVLO circuit is

+

–

EA

OUT

6 (10)

RTCT

4 (7)

COMP

1 (1)

V

DD

V

REF

5V

Reference

7 (12)

8 (14)

FB

2 (3)

V

D

(11)

–

+

+
–

UVLO

+

–

COMP

PGND

(8)

Oscillator

TQ

S

Q

R

1V

R

2R

2.5V
Ref

( ) Pins Are 14-Pin Devices Only

38C/HC_01.eps

+
–

GND 5

AGND (9)

3 (5)

ISNS

Connection Notes

IMP38C4X, IMP38HC4X (8-Pin Devices)

50% Maximum Duty Cycle:
IMP38C44, IMP38HC44, IMP38C45, IMP38HC45

96% Maximum Duty Cycle:
IMP38C42, IMP38HC42, IMP38C43, IMP38HC43

IMP38C/HC/42/3/4/5

IMP38C/HC/42/3/4/5

2 408-432-9100/www.impweb.com © 2000 IMP, Inc.

!S

Pin Descriptions

Pin Configuration

IMP38C4x

IMP38HC4x

1COMP

2FB

3ISNS

4RT/CT

V

REF

V

DD

OUT

GND

8

7

6

5

38C/HC_02.eps

SO/MicroSO/DIP SO/DIP

IMP38C4x

IMP38HC4x

1COMP

2NC

3FB

4NC

V

REF

NC

V

DD

V

D

14

13

12

11

5ISNS OUT10

6NC AGND9

7RT/CT PGND8

38C/HC_03.eps

powered through the out pin. Leakage current from the external
power MOSFETs will not force the PWM output to rise and turn
the external MOSFETs on.

Current-sense propagation delay time is 35ns typical, 65ns maxi­mum, representing an up to 75 percent reduction over other 38xx
implementations.

Output stage drive is 0.5A for IMP38C4x devices. The high-drive
IMP38HC4x family is rated at 1.0A peak current drive.

Like conventional 384x controllers, the IMP38C4x and
IMP38HC4x controllers use the current-mode architecture for
superior load regulation, pulse-by-pulse current limiting and out­put MOSFET protection. All versions operate up to 20 volts.

For maximum application flexibility, start-up voltage ranges from

14.5V to 8.4V. Start-up current has been reduced to 120µA maxi-
mum and operating current has been reduced to 1.5mA maximum.

The IMP38C4x/IMP38HC4x are available in 8-pin and 14-pin DIP
and SO packages as well as the 8-pin MicroSO package. The 14­pin devices provide separate pins for the controller power supply
and the output driver supply. This configuration maximizes
application flexibility and performance. The 14-pin package can
also dissipate more power. Devices in the compact 8-pin packages
do not have separate output drive supply connections.

The IMP38C4x and IMP38HC4x families operate over the –40°C
to +85°C temperature range.

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IMP38C/HC/42/3/4/5

IMP38C/HC/42/3/4/5

© 2000 IMP, Inc.

PWM Controllers

3

Ordering Information

For SO and MicroSO packages, append “/T” to the ordering part number for tape and reel packaging.

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ASE24C83PMIOS-8 – 04 ° 58otC °CV5.41V0.9%69V5.2A5.0
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DPE34C83PMIPIDcitsalP-41 – 04 ° 58otC °CV4.8V6.7%69V5.2A5.0
ASE34C83PMIOS-8 – 04 ° 58otC °CV4.8V6.7%69V5.2A5.0
DSE34C83PMIOS-41 – 04 ° 58otC °CV4.8V6.7%69V5.2A5.0

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D/34C83PMIEID

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DPE44C83PMIPIDcitsalP-41 – 04 ° 58otC °CV5.41V0.9%05V5.2A5.0
ASE44C83PMIOS-8 – 04 ° 58otC °CV5.41V0.9%05V5.2A5.0
DSE44C83PMIOS-41 – 04 ° 58otC °CV5.41V0.9%05V5.2A5.0

AME44C83PMIOSorciM-8 – 04 ° 58otC °CV5.41V0.9%05V5.2A5.0

D/44C83PMIEID

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DPE54C83PMIPIDcitsalP-41 – 04 ° 58otC °CV4.8V6.7%05V5.2A5.0
ASE54C83PMIOS-8 – 04 ° 58otC °CV4.8V6.7%05V5.2A5.0
DSE54C83PMIOS-41 – 04 ° 58otC °CV4.8V6.7%05V5.2A5.0

AME54C83PMIOSorciM-8 – 04 ° 58otC °CV4.8V6.7%05V5.2A5.0

D/54C83PMIEID

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DPE24CH83PMIPIDcitsalP-41 – 04 ° 58otC °CV5.41V0.9%69V5.2A0.1
ASE24CH83PMIOS-8 – 04 ° 58otC °CV5.41V0.9%69V5.2A0.1
DSE24CH83PMIOS-41 – 04 ° 58otC °CV5.41V0.9%69V5.2A0.1
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D/24CH83PMIEID

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DPE34CH83PMIPIDcitsalP-41 – 04 ° 58otC °CV4.8V6.7%69V5.2A0.1
ASE34CH83PMIOS-8 – 04 ° 58otC °CV4.8V6.7%69V5.2A0.1
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D/34CH83PMIEID

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DPE44CH83PMIPIDcitsalP-41 – 04 ° 58otC °CV5.41V0.9%05V5.2A0.1
ASE44CH83PMIOS-8 – 04 ° 58otC °CV5.41V0.9%05V5.2A0.1
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IMP38C/HC/42/3/4/5

IMP38C/HC/42/3/4/5

4 408-432-9100/www.impweb.com © 2000 IMP, Inc.

!S

Absolute Maximum Ratings

VCCSupply Voltage . . . . . . . . . . . . . . . . . . . . . . 20V

V

CC

Supply Current . . . . . . . . . . . . . . . . . . . . . . 30mA

I

OUT

Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.0A

Current-Sense and Feedback Inputs . . . . . . . . 0.3V to 5.5V

Operation Junction Temperature . . . . . . . . . . . +150°C

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

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

Parameter Symbol Conditions Min Typ Max Units

Reference

Output voltage V

REF

TA= +25°C, IO= 1mA 4.90 5.00 5.10 V

Line Regulation 12V ≤ V

CC

≤ 18V, I

OUT

= 5µA220mV

Load Regulation 1mA ≤ IO≤ 20mA 1 25 mV

Temperature Stability TC

REF

Note 1 0.2 mV/°C

Total Reference Variation Line, Load, Temperature, Note 1 4.82 5.18 V

Output Noise Voltage V

N

10Hz ≤ f ≤ 10kHz, TA= +25°C, Note 1 50 µV

Long Term Stability TA= 125°C, 1000 Hours, Note 1 TBD mV

Output Short Circuit I

SC

–30 –40 –180 mA

Oscillator Section

Initial Accuracy f

INIT

TA= 25°C, Note 5 49 52 55 kHz

Voltage Stability 12V ≤ VCC≤ 18V 0.2 1.0 %

Temperature Stability TC

OSC

Note 1 0.04 %/°C

Discharge Current V

RT/CT

= 2V 7.2 8.4 12.0 mA

Amplitude peak-to-peak V

OSC, P-P

V

RT/CT

peak-to-peak 1.1 1.7 2.3 V

Error Amplifier Section

Input Voltage V

IN

V

COMP

= 2.5V 2.45 2.50 2.55 V

Input Bias Current I

B

VFB= 4.5V –11µA

Open Loop Gain A

VOL

2V ≤ VO≤ 4V, Note 1 65 90 dB

Unity Gain Bandwidth UGBW Note1 0.7 1.0 MHz

Power Supply Rejection Ratio PSRR V

START

≤ VCC≤ V

CCMAX

60 dB

Output Sink Current I

OL

VFB= 2.7V, Vcomp = 1.1V 2 6 mA

Output Source Current I

OH

VFB= 2.3V, Vcomp = 5.0V –0.5 –1.0 mA

V

OUT

High V

OH

VFB= 2.3V, RL= 15kΩ to ground 4.5 4.6 5.0 V

V

OUT

Low V

OL

VFB= 2.7V, RL= 15kΩ to V

REF

0.30 0.50 V

Unless otherwise noted, VCC= 15V, RT = 10kΩ and CT = 3.3nF. Specifications are over the – 40°C to +85°C ambient temperature range.
Bold/blue specifications indicate enhanced performance features.

Electrical Characteristics

Package Thermal Resistance

8-Pin Plastic DIP (θ

JA

) . . . . . . . . . . . . . . . . . 125°C/W

8-Pin MicroSO (θ

JA

) . . . . . . . . . . . . . . . . . . . 250°C/W

8-Pin SO (θ

JA

) . . . . . . . . . . . . . . . . . . . . . . . . 170°C/W

14-Pin Plastic DIP (θ

JA

) . . . . . . . . . . . . . . . . 90°C/W

14-Pin SO (θ

JA

) . . . . . . . . . . . . . . . . . . . . . . . 145°C/W

Note: All voltages are referenced to GND.

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

IMP38C/HC/42/3/4/5

IMP38C/HC/42/3/4/5

© 2000 IMP, Inc.

PWM Controllers

5

Electrical Characteristics

Parameter Symbol Conditions Min Typ Max Units

Current Sense

Gain A

VOL

Notes 1, 2 and 3 2.90 3.00 3.10 V/V

Over Current Protection Threshold Vcomp = max, Note 2 0.9 0.98 1.1 V
Power Supply Rejection Ratio PSRR V

START

≤ VCC≤ 18V 70 dB

Input Bias Current I

B

–0.1 – 2.0 µA

Delay to Output T

PD

VFB= 0V, ISNS 0V to 2V, CL= 1nF 50 65 ns

Output

IMP38C4x

ON Resistance, High R

DS (ON)ISOURCE

= 0.2A 20 Ω

ON Resistance, Low I

SINK

= 0.2A 11

IMP38HC4x

ON Resistance, High R

DS (ON)ISOURCE

= 0.2A 10 Ω

ON Resistance, Low I

SINK

= 0.2A 5.5

Peak Drive Current HC devices 1.0 A

H devices 0.5

IMP38C4x Rise Time T

R

TA= 25°C, CL= 1nF 40 70 ns

IMP38C4x Fall Time T

F

TA= 25°C, CL= 1nF 30 50 ns

IMP38HC4x Rise Time T

R

TA= 25°C, CL= 1nF 20 50 ns

IMP38HC4x Fall Time T

F

TA= 25°C, CL= 1nF 15 40 ns

Shoot-through Current 0mA

Undervoltage Lockout

Start Threshold IMP38C42/4, IMP38HC42/4 13.5 14.5 15.5 V

IMP38C43/5, IMP38HC43/5 7.8 8.4 9.0

Minimum Operating Voltage IMP38C42/4, IMP38HC42/4 8 9 10 V

IMP38C43/5, IMP38HC43/5 7.0 7.6 8.2

Pulse Width Modulator

Maximum Duty Cycle IMP38C42/3, IMP38HC42/3, 94 96 %

Maximum Duty Cycle IMP38C44/5, IMP38HC44/5 48 50 %

Minimum Duty Cycle 0%

Supply Current

Start-Up Current VCC= 13V for IMP38C42/44, IMP38HC42/44 95 120 µA

VCC= 7.5V for IMP38C43/45, IMP38HC43/45

Operating Current I

CC

VFB= VIS= 0 0.5 1.5 mA

Unless otherwise noted, VCC= 15V, RT= 10kΩ and CT= 3.3nF. Specifications are over the – 40°C to +85°C ambient temperature range.
Bold/blue specifications indicate enhanced performance features.

Note 1. Guaranteed by design. Not 100% tested in production.
Note 2. Measured at trip point of V

FB

= 0V.

Note 3. Gain is defined as:

Table 1. Startup and Operating Voltage Selection Guide

A

V

V

, 0 V 0.8V

COMP

CS

CS

=≤≤

∆

∆

Note 4. Adjust VCCabove the start threshold before setting at 15V.
Note 5. Output frequency equals the oscillator frequency for

IMP38C42/3 and IMP38HC42/3 devices. Output frequency
equals one-half the oscillator frequency for IMP38C44/5 and
IMP38HC44/5 devices.

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IMP38C/HC/42/3/4/5

IMP38C/HC/42/3/4/5

6 408-432-9100/www.impweb.com © 2000 IMP, Inc.

!S

Transient Protection

Good high-frequency layout practices should be followed. Avoid
long printed-circuit traces and component leads. Locate oscillator
and compensation components near the IC. Avoid capacitive and
inductive coupling of the switching waveform into the
high-impedance inputs of the error amplifier, oscillator, and
current-sense amplifier. V

REF

and VCCstability will be aided by

using high-frequency decoupling capacitors.

Undervoltage Lockout

Several different thresholds are available.

Under-voltage lockout (UVL) performance has been improved.
When the power supply voltage is below the startup voltage,
internal circuitry puts the output into a low impedance state and
sets the output to zero. The output will sink up to 20mA in this
controlled state and remain below 1.3V, well below the turn-on
threshold voltage of the external MOSFET.

With the IMP38C/HC4x output stage design, leakage current
from the external power MOSFETs will not force the PWM output
to rise and turn the external MOSFET on.

Even when V

DD

drops to zero volts, the OUT pin will not rise
above approximately 1.3V because the UVLO circuit is powered
through the OUT pin.

The IMP output stage performance in UVL mode, while sinking

20mA, is shown in Figure 2.

Figure 2. Output Stage Performance in UVL Mode

0

Output

(V)

VDD (V)

2.0

1.5

1.0

0.5

0

V

OUT

While Sinking 20mA

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The IMP38C and IMP38HC devices are compatible with generic
384x PWM devices. The following discussion highlights the dif­ferences and advantages of the IMP ‘C’ and ‘HC’ designs.

Start-up Current

IMP’s BiCMOS process allows for substantial reduction in the
start-up current. Typical start-up current is 95µA, with a maxi­mum limit of 120µA. Low start-up current allows high resistance,
lower-wattage, start-up resistors to supply controller start-up
power.

Operating Current

Operating current has been reduced to 1.5mA maximum.
Compared to the 11mA needed for a typical bipolar controller and
6mA for competitive BiCMOS controllers, IMP's low operating
current allows the controller to run cooler and with better effi­ciency. In addition, the V

CC

hold-up capacitance (used during

start-up) can be reduced.

Output Driver

The IMP38HC4x/38C4x CMOS output stage drives external
power MOSFETs to the full supply voltage. Low ON-resistance
and high peak current drive combine to give greater than 1000pF
gate capacitance drive capability. Rise and fall time requirements
may dictate the appropriate value of output capacitance. Within
the restrictions of output capacity and controller power dissipa­tion, switching frequencies can exceed 1MHz.

The CMOS output stage “break-before-make” action is guaran­teed by design and insures that no cross-conduction current will
flow. This minimizes heat dissipation, increases efficiency and
enhances reliability.

Oscillator Operation

Two external components, RT and CT, set the switching frequency.

With V

CC

= 14V, RT = 10k and CT = 3.3nF, nominal switching

frequency is 50kHz.

Figure 1. Oscillator Component Selection

Application Information

frequency Hz

1.73

RT CT F

[]

=

[]×[]

Ω

IMP38C4x

IMP38HC4x

V

REF

RT/CT

GND

38C/HC_07.eps

RT

CT

IMP38C/HC/42/3/4/5

IMP38C/HC/42/3/4/5

© 2000 IMP, Inc.

PWM Controllers

7

Application Information

OUT

6 (10)

V

D

(11)

–

+

+

–

UVLO

+

–

COMP

PGND

(8)

TQ

S

Q

R

UVL

Protection

1V

R

2R

( ) Pins Are 14-Pin Devices Only

38C/HC_06.eps

GND 5

AGND (9)

3 (5)

ISNS

Connection Notes

IMP38C4X, IMP38HC4X (8-Pin Devices)

50% Maximum Duty Cycle:
IMP38C44, IMP38HC44, IMP38C45, IMP38HC45

96% Maximum Duty Cycle:
IMP38C42, IMP38HC42, IMP38C43, IMP38HC43

Figure 3. UVL Protection Circuit

IMP38C/HC/42/3/4/5

IMP38C/HC/42/3/4/5

8 408-432-9100/www.impweb.com © 2000 IMP, Inc.

!S

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2b540.0070.041.187.1
3b030.0540.008.041.1

D553.0004.020.961.01

1D500.0 ––––– 31.0 –––––
E003.0523.026.762.8

1E042.0082.001.611.7
e001.0 ––––– 45.2

Ae003.0 ––––– 26.7
Be ––––– 034.0 ––––– 29.01
Ce ––––– 060.0

L511.0051.029.218.3

AA781-OMgniwarDCEDEJ*
AA211-SMgniwarDCEDEJ**
AB100-SMgniwarDCEDEJ***

3ta.50t_CH/C83

SO (8-Pin)

SO (8-Pin)

Package Dimensions

A2

A

L

A1

D1

D

e

b2

b

0°–15°

E

E1

C

eA
eB

Plastic DIP (8-Pin)a.eps

IMP38C/HC/42/3/4/5

IMP38C/HC/42/3/4/5

© 2000 IMP, Inc.

PWM Controllers

9

Package Dimensions

D1

D

eA

C

0°–15°

A

E1 E

e1

B1

B

L

A1

Plastic DIP (14-Pin).eps

Plastic DIP (14-Pin)

SO (14-Pin)

H

E

eB

D

A1

A

SO (16-Pin).eps

L

0°– 8°

C

sehcnIsretemilliM

niMxaMniMxaM

*)niP-41(OS

A6290.03401.053.256.2

1A0400.0811.001.003.0
B310.0020.033.015.0
C1900.05210.032.023.0
D5643.02263.008.802.9
E412.02992.004.706.7

eCSB050.0CSB72.1

H493.0914.000.0156.01
L610.0050.004.072.1

**)niP-41(PIDcitsalP

A551.0002.049.380.5

1A02.005.015.072.1
B410.0020.0653.0805.0

1B050.0560.072.156.1
C800.0210.0402.0403.0
D547.0077.039.8155.91
E003.0523.026.752.8

1E042.0062.001.606.6

1ePYT001.0PYT45.2
AePYT003.0PYT26.7

L001.0 ––––– 81.318.3

FA310-SMgniwarDCEDEJ*

BA-AA100-OMgniwarDCEDEJ**

3ta.60t_CH/C83

IMP, Inc.
Corporate Headquarters
2830 N. First Street
San Jose, CA 95134-2071
Tel: [phone]
Fax: [phone]
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.

©

2000 IMP, Inc.
Printed in USA
Publication #: 3001
Revision: D
Issue Date: 08/30/00
Type: Preliminary

IMP38C/HC/42/3/4/5

IMP38C/HC/42/3/4/5