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參數(shù)資料
| 型號： | MCP1603 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | 2.0 MHz, 500 mA Synchronous Buck Regulator |
| 中文描述： | 2.0兆赫，500毫安同步降壓穩(wěn)壓器 |
| 文件頁數(shù)： | 5/26頁 |
| 文件大小： | 672K |
| 代理商： | MCP1603 |
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2007 Microchip Technology Inc.
DS22042A-page 5
MCP1603
Output Characteristics
Adjustable Output Voltage Range
Reference Feedback Voltage
V
OUT
V
FB
0.8
—
-3.0
-2.5
—
-3.0%
-2.5
—
—
0.8
—
—
0.1
V
R
V
R
0.3
4.5
—
+3.0
+2.5
—
+3.0%
+2.5
—
V
V
%
%
nA
%
%
%/V
Note 2
Reference Feedback Voltage
Tolerance
T
A
= -40°C to +25°C
T
A
= +25°C to +85°C
Feedback Input Bias Current
Output Voltage Tolerance Fixed
I
VFB
V
OUT
V
OUT
V
LINE-
REG
V
LOAD-
REG
F
OSC
T
SS
R
DSon-P
R
DSon-N
I
LX
T
A
= -40°C to +25°C,
Note 3
T
A
= +25°C to +85°C,
Note 3
V
IN
= V
R
+ 1V to 5.5V,
I
OUT
= 100 mA
V
IN
= V
R
+1.5V,
I
LOAD
= 100 mA to 500 mA
Line Regulation
Load Regulation
—
0.35
—
%
Internal Oscillator Frequency
Start Up Time
R
DSon
P-Channel
R
DSon
N-Channel
L
X
Pin Leakage Current
1.5
—
—
—
-1.0
2.0
0.6
500
500
±0.1
2.8
—
—
—
1.0
MHz
ms
m
Ω
m
Ω
μA
T
R
= 10% to 90%
I
P
= 100 mA
I
N
= 100 mA
SHDN = 0V, V
IN
= 5.5V,
L
X
= 0V, L
X
= 5.5V
Note 6
Positive Current Limit Threshold
Note 1:
The minimum V
IN
has to meet two conditions: V
IN
≥
2.7V and V
IN
≥
V
OUT
+ 0.5V.
2:
Reference Feedback Voltage Tolerance applies to adjustable output voltage setting.
3:
V
R
is the output voltage setting.
4:
The maximum allowable power dissipation is a function of ambient temperature, the maximum allowable
temperature and the thermal resistance from junction to air (i.e. T
A
, T
J
,
θ
JA
). Exceeding the maximum
allowable power dissipation causes the device to initiate thermal shutdown.
5:
The internal MOSFET switches have an integral diode from the L
X
pin to the V
IN
pin, and from the L
X
pin
to the GND pin. In cases where these diodes are forward-biased, the package power dissipation limits
must be adhered to. Thermal protection is not able to limit the junction temperature for these cases.
6:
The current limit threshold is a cycle-by-cycle peak current limit.
+I
LX(MAX)
—
860
—
mA
DC CHARACTERISTICS (CONTINUED)
Electrical Characteristics:
Unless otherwise indicated, V
IN
= SHDN = 3.6V, C
OUT
= C
IN
= 4.7 μF, L = 4.7 μH, V
OUT
(ADJ) = 1.8V,
I
OUT
= 100 mA, T
A
= +25°C.
Boldface
specifications apply over the T
A
range of -40°C to +85°C.
Parameters
Sym
Min
Typ
Max
Units
Conditions
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