參數(shù)資料
型號(hào)： ISL88550AIRZ-T
廠商： INTERSIL CORP
元件分類： 穩(wěn)壓器
英文描述： Synchronous Step Down Controller with Sourcing and Sinking LDO Regulator
中文描述： SWITCHING CONTROLLER, 600 kHz SWITCHING FREQ-MAX, PQCC28
封裝： 5 X 5 MM, ROHS COMPLIANT, PLASTIC, MO-220WHHD-1, TQFN-28
文件頁(yè)數(shù)： 3/25頁(yè)
文件大小： 928K
代理商： ISL88550AIRZ-T
3
FN6168.0
October 12, 2005
Absolute Maximum Ratings
Thermal Information
VIN to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-0.3V to +25V
VDD, AVDD, VTTI to GND. . . . . . . . . . . . . . . . . . . . . . . .-0.3V to 6V
SHDNA#, REFIN to GND. . . . . . . . . . . . . . . . . . . . . . . . .-0.3V to 6V
SS, POK1, POK2, SKIP#, ILIM, FB to GND . . . . . . . . . .-0.3V to 6V
STBY#, T
ON
, REF, UVP/OVP to GND. . . . . . . .-0.3V to AV
DD
+0.3V
OUT, VTTR to GND . . . . . . . . . . . . . . . . . . . . . .-0.3V to AV
DD
+0.3V
LGATE to PGND1 . . . . . . . . . . . . . . . . . . . . . . . .-0.3V to V
DD
+0.3V
UGATE to PHASE . . . . . . . . . . . . . . . . . . . . -0.3V to VBOOT +0.3V
BOOT to PHASE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-0.3V to 6V
PHASE to PGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -2V to +33V
VTT to GND. . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to VTTI+0.3V
VTTS to GND. . . . . . . . . . . . . . . . . . . . . . . . . . .-0.3V to AV
DD
+0.3V
PGND1, PGND2 to GND. . . . . . . . . . . . . . . . . . . . . . . -0.3 to +0.3V
REF Short Circuit to GND.. . . . . . . . . . . . . . . . . . . . . . . .Continuous
Thermal Resistance
TQFN Package (Notes 1, 2). . . . . . . . .
θ
JA
(°C/W)
31
θ
JC
(°C/W)
1.5
Operating Conditions
Junction Temperature Range. . . . . . . . . . . . . . . . . .-55°C to +150°C
Operating Temperature Range . . . . . . . . . . . . . . . . .-40°C to +85°C
Storage Temperature. . . . . . . . . . . . . . . . . . . . . . . . . -65°C + 150°C
Lead Temperature (Soldering, 10s). . . . . . . . . . . . . . . . . . . .+300°C
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the
device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
NOTES:
1.
θ
JA
is measured in free air with the component mounted on a high effective thermal conductivity test board with “direct attach” features. See
Tech Brief TB379.
2. For
θ
JC
, the "case temp" location is the center of the exposed metal pad on the package underside. See Tech Brief TB379.
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)
Note: Following are target specifications. Final limits may change as a result of characterization.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNIT
MAIN PWM CONTROLLER
V
IN
Input Voltage Range
2
25
V
V
DD
, AV
DD
Input Voltage Range
4.5
5.5
V
Output Adjust Range
0.7
3.5
V
Output Voltage Accuracy (Note 4)
FB = OUT
0.693
0.7
0.707
V
FB = GND
2.470
2.5
2.53
V
FB = V
DD
1.78
1.8
1.82
V
Soft-Start Ramp Time
Rising edge of SHDNA# to full current limit
1.7
ms
ON-Time
V
IN
= 15V,
V
OUT
=
1.5V
(Note 5)
T
ON
= GND (600kHz)
170
194
219
ns
T
ON
= REF (450kHz)
213
243
273
ns
T
ON
= OPEN (300kHz)
316
352
389
ns
T
ON
= AV
DD
(200kHz)
461
516
571
ns
Minimum, OFF-Time
(Note 5)
200
300
450
ns
V
IN
Quiescent Supply Current
25
40
μA
V
IN
Shutdown Supply Current
SHDNA# = STBY# = GND
1
5
μA
Combined AV
DD
and V
DD
Quiescent Supply
Current
All on (PWM, VTT, & VTTR on), V
FB
= 0.75V
2.5
5
mA
STBY# = GND
(only VTTR & PWM on), V
FB
= 0.75V
1
2
mA
Combined AV
DD
and V
DD
Shutdown Supply
Current
SHDNA# = STBY# = GND
2
10
μA
AV
DD
Undervoltage Lockout Threshold
Rising edge of AV
DD
4.1
4.25
4.4
V
Hysteresis
50
mV
REFERENCE
Reference Voltage
AV
DD
= 4.5V to 5.5V; I
REF
= 0 to 130μA
1.98
2
2.02
V
ISL88550A
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