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IMP38C44ESA 参数 Datasheet PDF下载

IMP38C44ESA图片预览
型号: IMP38C44ESA
PDF下载: 下载PDF文件 查看货源
内容描述: BiiCMOS Currentt - 模式BiiCMOS Currentt - 模式 [BiiCMOS Currentt--Mode BiiCMOS Currentt--Mode]
分类和应用: 稳压器开关式稳压器或控制器电源电路开关式控制器光电二极管信息通信管理
文件页数/大小: 10 页 / 161 K
品牌: A1PROS [ A1 PROS CO., LTD. ]
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IMP38C/HC/42/3/4/5
P
OWER
M
ANAGEMENT
BiCMOS Current-Mode
PWM Controllers
Key Features
N
N
N
N
N
N
N
N
N
N
N
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
– 1MHz Operation
– No Cross-Conduction Current
– 50ns Current-Sense Delay
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
Block Diagrams
V
DD
7 (12)
(11)
V
D
+
V
REF
8 (14)
5V
Reference
UVLO
+
RTCT
COMP
FB
4 (7)
1 (1)
T
2 (3)
Q
Oscillator
6 (10)
OUT
EA
2R
1V
R
COMP
S
R
Q
+
+
2.5V
Ref
+
(8)
PGND
(
) Pins Are 14-Pin Devices Only
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
38C/HC_01.eps
© 2000 IMP, Inc.
408-432-9100/www.impweb.com
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