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| 型号： | LTC3773EUHF#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 4/32页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 38-QFN |
| 标准包装： | 52 |
| 系列： | PolyPhase® |
| PWM 型： | 电流模式 |
| 输出数： | 3 |
| 频率 - 最大： | 630kHz |
| 占空比： | 98.5% |
| 电源电压： | 3.3 V ~ 36 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： | 38-WFQFN 裸露焊盘 |
| 包装： | 管件 |
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LTC3773
ELECTRICAL CHARACTERISTICS (Note 3) The ● denotes the speci?cations which apply over the full
operating temperature range, otherwise speci?cations are at T A = 25°C. V CC = V DR = V BOOST = V SDB = 5V, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Power Good Output Indication
V PGL
I PGOOD
PGOOD Voltage Output Low
PGOOD Output Leakage
I PGOOD = 2mA
V PGOOD = 5V
0.1
0.3
1
V
μA
PGOOD Trip Thresholds
V FB with Respect to 0.6V Reference
V PGTHNEG
V PGTHPOS
V PGDLY
V FB Ramping Negative
V FB Ramping Positive
PGOOD Delay
PGOOD Goes Low After V PGDLY Delay
–7
7
100
–10
10
150
–13
13
%
%
μs
Oscillator and Phase-Locked Loop
f NOM
f LOW
f HIGH
f PLLLOW
f PLLHIGH
Nominal Frequency
Low Frequency
High Frequency
PLLIN Minimum Input Frequency
PLLIN Maximum Input Frequency
V PLLFLTR Open
V PLLFLTR = 0V
V PLLFLTR = 5V
360
190
510
540
400
220
560
160
700
440
250
630
200
kHz
kHz
kHz
kHz
kHz
PLLIN/FC, PHASEMD, PLLFLTR
Logic Input
V LO
V FLOAT
V HI
V PLLIN
I PLLFLTR
Low Level Input Voltage
Floating Voltage
High Level Input Voltage
PLLIN Synchronization Input Threshold
Phase Detector Output Current
V PLLFLTR = 1.5V
1.0
1.6
3.0
1
V
V
V
V
Sinking Capability
Sourcing Capability
f PLLIN < f OSC
f PLLIN > f OSC
25
–25
μA
μA
P RELPHS
CLKOUT
Controller 2 - Controller 1 Phase
Controller 3 - Controller 1 Phase
Controller 2 - Controller 1 Phase
Controller 3 - Controller 1 Phase
Controller 1 TG to CLKOUT Phase
PHASEMD Floats or V PHASEMD = 0V
V PHASEMD = 5V
PHASEMD Floats
V PHASEMD = 0V
V PHASEMD = 5V
120
240
90
270
0
60
180
Deg
Deg
Deg
Deg
Deg
Deg
Deg
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LTC3773 is guaranteed to meet performance speci?cations
from 0°C to 85°C. Speci?cations over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls. T J is calculated from the ambient
temperature T A and power dissipation P D according to the following
formula.
LTC3773EG: T J = T A + (P D x 95°C/W)
LTC3773EUHF: T J = T A + (P D x 34°C/W)
Note 3: All currents into device pins are positive; all currents out of device
pins are negative. All voltages are referenced to ground unless otherwise
speci?ed.
Note 4: The IC is tested in a feedback loop that adjusts V FB to achieve a
speci?ed error ampli?er output voltage (V ITH ).
Note 5: Guaranteed by design, not subject to test.
Note 6: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency. See Applications Information.
Note 7: R DS(ON) limit is guaranteed by design and/or correlation to static
test.
Note 8: The minimum on-time condition corresponds to an inductor
peak-to-peak ripple current of ≥40% of I MAX (see minimum on-time
considerations in the Applications Information section).
3773fb
4
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