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参数资料
| 型号： | ISL6445IAZ-TK |
| 厂商： | Intersil |
| 文件页数： | 5/15页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 24-QSOP |
| 标准包装： | 1 |
| PWM 型： | 电流模式 |
| 输出数： | 2 |
| 频率 - 最大： | 1.55MHz |
| 占空比： | 73% |
| 电源电压： | 4.5 V ~ 24 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 24-SSOP（0.154"，3.90mm 宽） |
| 包装： | 标准包装 |
| 其它名称： | ISL6445IAZ-TKDKR |
ISL6445
Electrical Specifications
Recommended operating conditions unless otherwise noted. Refer to “Block Diagram” on page 3 and “Typical
Application Schematic” on page 2. V IN = 5.6V to 24V, or VCC5 = 5V ±10%, T A = -40°C to +85°C, Typical values
are at T A = +25°C. Parameters with MIN and/or MAX limits are 100% tested at +25°C, unless otherwise
specified. Temperature limits established by characterization and are not production tested. (Continued)
Minimum Duty Cycle
PARAMETER
TEST CONDITIONS
MIN
-
TYP
4
MAX
-
UNITS
%
PWM CONTROLLER ERROR AMPLIFIERS
DC Gain (Note 6)
Gain-Bandwidth Product (Note 6)
Slew Rate (Note 6)
Maximum Output Voltage (Note 6)
Minimum Output Voltage (Note 6)
80
5.9
-
0.9
-
88
-
2.0
-
-
-
-
-
-
3.6
dB
MHz
V/μs
V
V
PWM CONTROLLER GATE DRIVERS (Note 7)
Sink/Source Current
-
400
-
mA
Upper Drive Pull-Up Resistance
Upper Drive Pull-Down Resistance
Lower Drive Pull-Up Resistance
Lower Drive Pull-Down Resistance
Rise Time
Fall Time
VCC5 = 4.5V
VCC5 = 4.5V
VCC5 = 4.5V
VCC5 = 4.5V
C OUT = 1000pF
C OUT = 1000pF
-
-
-
-
-
-
8
3.2
8
1.8
18
18
-
-
-
-
-
-
Ω
Ω
Ω
Ω
ns
ns
POWER GOOD AND CONTROL FUNCTIONS
PGOOD LOW Level Voltage
PGOOD Leakage Current
PGOOD Upper Threshold, PWM 1 and 2
PGOOD Lower Threshold, PWM 1 and 2
Pull-up = 100k Ω
Fraction of set point
Fraction of set point
-
-
105
80
0.1
-
-
-
0.5
±1.0
120
95
V
μA
%
%
ISEN and CURRENT LIMIT
Full Scale Input Current (Note 8)
-
32
-
μA
Overcurrent Threshold (Note 8)
OCSET (Current Limit) Voltage
ROCSET = 110k Ω
-
-
64
1.75
-
-
μA
V
SOFT-START
Soft-Start Current
-
5
-
μA
PROTECTION
Thermal Shutdown
Rising
Hysteresis
-
-
150
20
-
-
°C
°C
NOTES:
2. In normal operation, where the device is supplied with voltage on the V IN pin, the VCC_5V pin provides a 5V output capable of 60mA (min).
When the VCC_5V pin is used as a 5V supply input, the internal LDO regulator is disabled and the V IN input pin must be connected to the
VCC_5V pin. (Refer to the “Pin Descriptions” on page 8 for more details.)
3. This is the total shutdown current with VIN = VCC_5V = PVCC = 5V.
4. Operating current is the supply current consumed when the device is active but not switching. It does not include gate drive current.
5. The peak-to-peak sawtooth amplitude is production tested at 12V only; at 5V this parameter is guaranteed by design.
6. Limits should be considered typical and are not production tested.
7. Limits established by characterization and are not production tested.
8. Established by characterization. The full scale current of 32μA is recommended for optimum current sample and hold operation. See “Feedback
5
FN9230.1
June 3, 2008
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