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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)： | 4/25頁 |
| 文件大?。?/td> | 928K |
| 代理商： | ISL88550A |
4
FN6168.0
October 12, 2005
Reference Load Regulation
I
REF
= 0 to 50μA
0.01
V
REF Under-voltage Lockout
V
REF
rising
1.93
V
Hysteresis
300
mV
FAULT DETECTION
OVP Trip Threshold (Referenced to nominal
V
OUT
)
UVP/OVP = AV
DD
110
114
118
%
UVP Trip Level Referred to Nominal V
OUT
65
70
75
%
POK1 Trip Level Referred to Nominal V
OUT
Lower level, falling edge, 1% hysteresis
87
90
93
%
Upper level, rising edge, 1% hysteresis
107
110
113
%
POK2 Trip Level Referred to Nominal VTTS
and VTTR
Lower level, falling edge, 1% hysteresis
87.5
90
92.5
%
Upper level, rising edge, 1% hysteresis
107.5
110
112.5
%
POK2 Disable Threshold (Measured at
REFIN)
V
REFIN
rising (Hysteresis = 75mV typical)
0.7
0.9
V
UVP Blanking Time
From rising edge of SHDNA#
8
14
25
ms
OVP, UVP, POK_ Propagation Delay
10
μ
s
POK_ Output Low Voltage
I
SINK
= 4mA
0.3
V
POK_ Leakage Current
V
POK_
= 5.5V, VFB = 0.8V, VTTS = 1.3V
1
μ
A
ILIM Adjustment Range
0.25
2.00
V
ILIM Input Leakage Current
0.1
μ
A
Current Limit Threshold (Fixed)
PGND1 to PHASE
ILIM = AV
DD
45
50
55
mV
Current Limit Threshold (Adjustable)
PGND1 to PHASE
V
ILIM
= 2V
170
200
235
mV
Current-Limit Threshold (Negative Direction)
PGND1 to PHASE
SKIP# = AV
DD
-75
-60
-45
mV
Current-Limit Threshold (Negative Direction)
PGND1 to PHASE
SKIP# = AV
DD,
ILIM = 2V
-250
mV
Current-Limit Threshold (Zero Crossing)
PGND1 to PHASE
3
mV
Thermal Shutdown Threshold
Rising
150
°C
Hysteresis
15
INTERNAL BOOT DIODE
V
D
Forward Voltage
PVCC-V
BOOT
, I
F
= 10mA
0.60
0.70
V
I
BOOT_LEAKAGE
Leakage Current
V
BOOT
= 25V, PHASE = 20V, PVCC = 5V
300
500
nA
MOSFET DRIVERS
UGATE Gate Driver ON-Resistance
V
BOOT
-V
PHASE
= 5V
1.5
5
LGATE Gate Driver ON-Resistance in High
State
1.5
5
LGATE Gate Driver ON-Resistance in Low
State
0.6
3
Dead Time (Additional to Adaptive Delay)
LGATE rising
30
ns
UGATE rising
30
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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