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参数资料
| 型号： | LTC3788IUH#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 4/32页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BST PWM CM 32-QFN |
| 标准包装： | 73 |
| PWM 型： | 电流模式 |
| 输出数： | 2 |
| 频率 - 最大： | 850kHz |
| 占空比： | 100% |
| 电源电压： | 4.5 V ~ 38 V |
| 降压： | 无 |
| 升压： | 是 |
| 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 ~ 125°C |
| 封装/外壳： | 32-WFQFN 裸露焊盘 |
| 包装： | 管件 |
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LTC3788
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at T A = 25°C, VBIAS = 12V, unless otherwise noted (Note 2).
SYMBOL
t ON(MIN)
PARAMETER
Minimum BG On-Time
CONDITIONS
(Note 7)
MIN
TYP
110
MAX
UNITS
ns
INTV CC Linear Regulator
V INTVCCVIN
V LDOVIN
V INTVCCEXT
V LDOEXT
V EXTVCC
Internal V CC Voltage
INTV CC Load Regulation
Internal V CC Voltage
INTV CC Load Regulation
EXTV CC Switchover Voltage
6V < VBIAS < 38V, V EXTVCC = 0V
I CC = 0mA to 50mA, V EXTVCC = 0V
V EXTVCC = 6V
I CC = 0mA to 40mA, V EXTVCC = 6V
EXTV CC Ramping Positive
5.2
5.2
4.5
5.4
0.5
5.4
0.5
4.8
5.6
2
5.6
2
5
V
%
V
%
V
V LDOHYS
EXTV CC Hysteresis
250
mV
Oscillator and Phase-Locked Loop
f PROG
Programmable Frequency
R FREQ = 25k
105
kHz
R FREQ = 60k
R FREQ = 100k
335
400
760
465
kHz
kHz
f LOW
f HIGH
Lowest Fixed Frequency
Highest Fixed Frequency
V FREQ = 0V
V FREQ = INTV CC
320
485
350
535
380
585
kHz
kHz
f SYNC
Synchronizable Frequency
PLLIN/MODE = External Clock
l
75
850
kHz
PGOOD1 and PGOOD2 Outputs
V PGL
I PGOOD
PGOOD Voltage Low
PGOOD Leakage Current
I PGOOD = 2mA
V PGOOD = 5V
0.2
0.4
±1
V
μA
V PG
PGOOD Trip Level
V FB with Respect to Set Regulated Voltage
V FB Ramping Negative
Hysteresis
V FB Ramping Positive
Hysteresis
–12
8
–10
2.5
10
2.5
–8
12
%
%
%
%
t PGOOD(DELAY)
PGOOD Delay
PGOOD Going High to Low
25
μs
BOOST1 and BOOST2 Charge Pump
I BOOST1,2
BOOST Charge Pump Available
Output Current
V SW1,2 = 12V; V BOOST1,2 – V SW1,2 = 4.5V;
FREQ = 0V, Forced Continuous or
Pulse-Skipping Mode
55
μA
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 LTC3788 is tested under pulsed load conditions such that T J
≈ T A . The LTC3788E is guaranteed to meet specifications from 0°C to 85°C
junction temperature. Specifications over the –40°C to 125°C operating
junction temperature range are assured by design, characterization and
correlation with statistical process controls. The LTC3788I is guaranteed
over the –40°C to 125°C operating junction temperature range. Note that
the maximum ambient temperature consistent with these specifications
is determined by specific operating conditions in conjunction with board
layout, the rated package thermal impedance and other environmental
factors. The junction temperature (T J , in °C) is calculated from the ambient
temperature (T A , in °C) and power dissipation (P D , in Watts) according to
the formula: T J = T A + (P D ? θ JA ), where θ JA = 34°C/W.
Note 3: This IC includes overtemperature protection that is intended to
protect the device during momentary overload conditions. The maximum
rated junction temperature will be exceeded when this protection is active.
Continuous operation above the specified absolute maximum operating
junction temperature may impair device reliability or permanently damage
the device.
Note 4: The LTC3788 is tested in a feedback loop that servos V FB to the
output of the error amplifier while maintaining I TH at the midpoint of the
current limit range.
Note 5: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency.
Note 6: Rise and fall times are measured using 10% and 90% levels.
Delay times are measured using 50% levels.
Note 7: See Minimum On-Time Considerations in the Applications
Information section.
3788fc
4
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