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參數(shù)資料
| 型號： | ISL88550A |
| 廠商： | Intersil Corporation |
| 英文描述： | Synchronous Step Down Controller with Sourcing and Sinking LDO Regulator |
| 中文描述： | 同步降壓控制器，具有采購和下沉LDO穩(wěn)壓器 |
| 文件頁數(shù)： | 5/25頁 |
| 文件大?。?/td> | 928K |
| 代理商： | ISL88550A |
5
FN6168.0
October 12, 2005
INPUTS AND OUTPUTS
Logic Input Threshold High (SHDNA#, SKIP#,
STBY# )
Rising edge
1.2
1.7
2.20
V
Hysteresis
225
mV
Logic Input Current (SHDNA#, SKIP#,
STBY#)
-1
1
μA
FB Input Logic Levels
Low (2.5V output)
0.1
V
High (1.8V output)
2.1
V
Input Bias Current (FB)
-0.1
0.1
μA
Four-Level Input Logic Levels
(T
ON
, OVP/UVP)
High
AV
DD
-0.4
V
Floating
3.15
3.85
REF
1.65
2.35
Low
0.5
Logic Input Current (T
ON
, OVP/UVP, Note 4)
-3
+3
μA
OUT Input Resistance
FB = GND
125
250
500
k
FB = AV
DD
90
180
270
k
FB Adjustable Mode
125
250
500
k
OUT Discharge Mode On-Resistance
15
30
LINEAR REGULATORS (VTTR AND VTT)
VTTI Input Voltage Range
1.0
2.8
V
VTTI Supply Current
I
VTT
= I
VTTR
= 0
0.1
1
mA
VTTI Shutdown Current
SHDNA# = STBY# = GND
10
μA
REFIN Input Impedance
V
REFIN
= 2.5V
17
20
27
k
REFIN range
1.0
2.8
V
VTT, VTTR UVLO Threshold (Measured at
OUT)
0.01
0.1
0.2
V
Soft-Start Charge Current
V
SS
= 0
4
μA
VTT internal MOSFET High-Side On-
Resistance
I
VTT
= -100mA, V
VTTI
= 1.5V, AV
DD
= 4.5V
(T
J
= 125°C)
0.10
0.28
VTT internal MOSFET Low-Side On-
Resistance
I
VTT
= 100mA, AV
DD
= 4.5V (T
J
= 125°C)
0.18
0.43
VTT Output Accuracy (Referenced to VTTR)
V
REFIN
= 1.8V or 2.5V, I
VTT
= ±5mA
-1.5
1.5
%
VTT Load Regulation
V
REFIN
= 2.5V, I
VTT
= 0 to ±1.5A
1
%
V
REFIN
= 1.8V, I
VTT
= 0 to ±1.5A
1
%
VTT Positive Current Limit
VTT = 0
2.5
3.0
4.0
A
VTT Negative Current Limit
VTT = VTTI
-3.5
-2.5
-2.0
A
VTTS Input Current
V
VTTS
= 1.5V, VTT Open
0.1
1
μA
VTTR Output Error (Referenced to V
REFIN
/2)
V
REFIN
= 1.8V, I
VTTR
=
0
mA
-1.25
1.25
%
VTTR Current Limit
VTTR = 0 or VTTI
±
20
±
40
±
60
mA
Electrical Specifications
VIN = +15V, V
DD
= AV
DD
= SHDNA# = STBY# = BOOT = ILIM = 5V, OUT = REFIN = VTTI = 2.5V,
FB = SKIP# = OVP/UVP = GND. PGND1 = PGND2 = PHASE = GND, VTTS = VTT, T
ON
= OPEN, T
A
= -40°C
to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C (Note 3)
(Continued)
Note: Following are target specifications. Final limits may change as a result of characterization.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNIT
ISL88550A
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