© 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
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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APE24C83PMIPIDcitsalP-8 – 04 ° 58otC °CV5.41V0.9%69V5.2A5.0
DPE24C83PMIPIDcitsalP-41 – 04 ° 58otC °CV5.41V0.9%69V5.2A5.0
ASE24C83PMIOS-8 – 04 ° 58otC °CV5.41V0.9%69V5.2A5.0
DSE24C83PMIOS-41 – 04 ° 58otC °CV5.41V0.9%69V5.2A5.0
AME24C83PMIOSorciM-8 – 04 ° 58otC °CV5.41V0.9%69V5.2A5.0
D/24C83PMIEID
APE34C83PMIPIDcitsalP-8 – 04 ° 58otC °CV4.8V6.7%69V5.2A5.0
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
AME34C83PMIOSorciM-8 – 04 ° 58otC °CV4.8V6.7%69V5.2A5.0
D/34C83PMIEID
APE44C83PMIPIDcitsalP-8 – 04 ° 58otC °CV5.41V0.9%05V5.2A5.0
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
APE54C83PMIPIDcitsalP-8 – 04 ° 58otC °CV4.8V6.7%05V5.2A5.0
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
APE24CH83PMIPIDcitsalP-8 – 04 ° 58otC °CV5.41V0.9%69V5.2A0.1
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
AME24CH83PMIOSorciM-8 – 04 ° 58otC °CV5.41V0.9%69V5.2A0.1
D/24CH83PMIEID
APE34CH83PMIPIDcitsalP-8 – 04 ° 58otC °CV4.8V6.7%69V5.2A0.1
DPE34CH83PMIPIDcitsalP-41 – 04 ° 58otC °CV4.8V6.7%69V5.2A0.1
ASE34CH83PMIOS-8 – 04 ° 58otC °CV4.8V6.7%69V5.2A0.1
DSE34CH83PMIOS-41 – 04 ° 58otC °CV4.8V6.7%69V5.2A0.1
AME34CH83PMIOSorciM-8 – 04 ° 58otC °CV4.8V6.7%69V5.2A0.1
D/34CH83PMIEID
APE44CH83PMIPIDcitsalP-8 – 04 ° 58otC °CV5.41V0.9%05V5.2A0.1
DPE44CH83PMIPIDcitsalP-41 – 04 ° 58otC °CV5.41V0.9%05V5.2A0.1
ASE44CH83PMIOS-8 – 04 ° 58otC °CV5.41V0.9%05V5.2A0.1
DSE44CH83PMIOS-41 – 04 ° 58otC °CV5.41V0.9%05V5.2A0.1
AME44CH83PMIOSorciM-8 – 04 ° 58otC °CV5.41V0.9%05V5.2A0.1
D/44CH83PMIEID
APE54CH83PMIPIDcitsalP-8 – 04 ° 58otC °CV4.8V6.7%05V5.2A0.1
DPE54CH83PMIPIDcitsalP-41 – 04 ° 58otC °CV4.8V6.7%05V5.2A0.1
ASE54CH83PMIOS-8 – 04 ° 58otC °CV4.8V6.7%05V5.2A0.1
DSE54CH83PMIOS-41 – 04 ° 58otC °CV4.8V6.7%05V5.2A0.1
AME54CH83PMIOSorciM-8 – 04 ° 58otC °CV4.8V6.7%05V5.2A0.1
D/54CH83PMIEID
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