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AIC1578 の電気的特性と機能

AIC1578のメーカーはAnalog Intergrations Corporationです、この部品の機能は「High-Efficiency/ Step-Down DC/DC Converter」です。


製品の詳細 ( Datasheet PDF )

部品番号 AIC1578
部品説明 High-Efficiency/ Step-Down DC/DC Converter
メーカ Analog Intergrations Corporation
ロゴ Analog Intergrations Corporation ロゴ 




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AIC1578 Datasheet, AIC1578 PDF,ピン配置, 機能
AIC1578
High-Efficiency, Step-Down DC/DC Converter
FEATURES
4V to 20V Input Voltage Operation.
High Efficiency (up to 95%).
Low Quiescent Current at 90µA.
Pulse-Skipping and Pulse-Frequency Modulation.
Inputs-Uncommitted Current Sense Comparator.
Duty Cycle Adjustable.
90KHz to 280KHz Oscillator Frequency.
Power-Saving Shutdown Mode (8µA Typical).
Push-Pull Driver Output.
APPLICATIONS
Notebook 5V/3.3V Main Power
Step-Down DC/DC Converter Module.
Constant Current Source for Battery Chargers.
TYPICAL APPLICATION CIRCUIT
VIN IRF9Z34
Q1
* L1
33µH
D1
1N5820
C3 +
220µF
**RS
+
C4
+
C1
C2 RDUTY
R2 1M
1M
Control
VIN CS+
DUTY
CS -
SHDN
FB
DRI
GND
AIC1578
D2
*Sumida MPP CORE **Charge current=57mV/RS
Constant Current Source for Battery Charger
DESCRIPTION
The AIC1578 is a high performance step-down
DC/DC converter, designed to drive an external
P-channel MOSFET to generate programmable
output voltages. Two main schemes of Pulse-
Skipping and Pulse-Frequency Modulation are
employed to maintain low quiescent current and
high conversion efficiency under wide ranges of
input voltage and loading condition. The
AIC1578 delivers 10mA to 2A of output current
with 87%~93% efficiency at VIN=9V, VOUT=5V
condition. A current sense comparator with both
inverting and non-inverting input uncommitted is
included to provide the crucial function of either
current limit protection or constant output current
control. When the AIC1578 is used in a high-side
current sensing step-down constant current
source, the efficiency is typically greater than
90%. Duty cycle can be adjusted to greater than
90% by connecting a resistor from DUTY pin to
VIN. Quiescent current is about 90µA and can be
reduced to 8µA in shutdown mode. Switching
frequency being in around 90KHz to 280KHz
range, small size switching components are ideal
for battery powered portable equipment.
ORDERING INFORMATION
AIC1578 XX
PACKAGE TYPE
N: PLASTIC DIP
S: SMALL OUTLINE
TEMPERATURE RANGE
C: 0°C~+70°C
ORDER NUMBER
AIC1578CN
(PLASTIC DIP)
AIC1578CS
(PLASTIC SO)
PIN CONFIGURATION
TOP VIEW
VIN 1
DUTY 2
SHDN 3
FB 4
8 CS+
7 CS-
6 DRI
5 GND
Analog Integrations Corporation 4F, 9, Industry E. 9th Rd, Science Based Industrial Park, Hsinchu Taiwan, ROC
DS-1578-02 Dec 27, 00
TEL: 886-3-5772500 FAX: 886-3-5772510
www.analog.com.tw
1

1 Page





AIC1578 pdf, ピン配列
AIC1578
TYPICAL PERFORMANCE CHARACTERISTICS
90
Frequency & Duty Cycle vs VIN
35
Ta = 27°C
85 Duty
30
80 25
Frequency
75 20
70 15
65 10
60 50
55
46
8 10 12 14 16 18 200
VIN ( V)
Duty Cycle vsTemperature
90
85
VIN=5V
80
75 VIN=13V
70
65 VIN=20V
60
0 20 40 60
Temperature (°C)
80
Frequency vs Temperature
290
VIN=20V
240
190 VIN=13V
140 VIN=5V
900 10 20 30 40 50 60 70
Temperature (°C)
Shutdown Current vs VIN
20
15 Ta=25°C
Ta=0°C
10
5 Ta=70°C
0
46
8 10 12 14 16 18 20
VIN (V)
Duty Cycle vs RDUTY
10
VIN=5V
90
80 VIN=10V
VIN=15V
70 VIN=20V
RDUTY refer to Typ. App.
60
0 12 3 4
RDUTY (M)
Quiescent Current vs VIN
11
100 Ta= 0°C
90
Ta= 25°C
80 Ta= 70°C
70
604 6 8 10 12 14 16 18 20
VIN (V)
3


3Pages


AIC1578 電子部品, 半導体
AIC1578
R4 1N4148
IRF9Z34
VIN Q1
1K
D1
1N5820
33µH
*L1
D3 RS 1N5820
C3 + 220µF C4 + D2
10µF
VBATT
R6
390K
C1 +
C2 RDUTY VIN
CS+
1M 1M DUTY
CS-
R13 R5
SHDN
FB
DRI
GND
1M
AIC1578
R8
+ 150K
C5 C6
R7
150K
1M
*:Sumida MPP Core
R12
NOTE:
RS =0.1, charge current =0.5A ±10%, VIN>VBATT +3.5V
RS =0.05, charge current =1A±10%, VIN>VBATT +4V
RS =0.033, charge current =1.5A ±10%, VIN>VBATT +4.5V
Efficiency>90%, measured at CS- node
220
R9
C7
100µF
+
R10
1.5K
C8
0.1µF
VBT
GND
TIMER
MODE
VREF
VDD
VOUT
LED
AIC1761/1766
R11
1.5K
Fig. 3 Battery Charge Circuit with High-Side Current Sensing Constant Current Source
PHYSICAL DIMENSIONS
8 LEAD PLASTIC SO (unit: mm)
D
H
E
e
A
C
B
L
SYMBOL
A
A1
B
C
D
E
e
H
L
MIN MAX
1.35
1.75
0.10
0.25
0.33
0.51
0.19
0.25
4.80
5.00
3.80
4.00
1.27(TYP)
5.80
6.20
0.40
1.27
6

6 Page



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