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参数资料
| 型号： | LTC3836EUFD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 3/30页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 28-QFN |
| 标准包装： | 2,500 |
| 系列： | PolyPhase® |
| PWM 型： | 电流模式 |
| 输出数： | 2 |
| 频率 - 最大： | 825kHz |
| 占空比： | 97% |
| 电源电压： | 2.75 V ~ 4.5 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： | 28-WFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
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LTC3836
ELECTRICAL CHARACTERISTICS The l denotes the speci?cations which apply over the full operating
temperature range, otherwise speci?cations are at T A = 25°C. V IN = 3.3V unless otherwise speci?ed.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Undervoltage Lockout Threshold
Shutdown Threshold at RUN/SS
Start-Up Current Source
Regulated Feedback Voltage
Output Voltage Line Regulation
Output Voltage Load Regulation
V FB1,2 Input Current
TRACK/SS2 Input Current
Overvoltage Protect Threshold
V IN Falling
V IN Rising
RUN/SS = 0V
–40°C to 85°C (Note 5)
2.75V < V IN < 4.5V (Note 5)
I TH = 0.9V (Note 5)
I TH = 1.7V
(Note 5)
TRACK/SS2 = 0V
Measured at V FB
l
l
l
1.95
2.15
0.45
0.4
0.591
1
0.66
2.25
2.45
0.65
0.65
0.6
0.05
0.12
–0.12
10
1.5
0.68
2.55
2.75
0.85
1
0.609
0.2
0.5
–0.5
50
2.2
0.7
V
V
V
μA
V
mV/V
%
%
nA
μA
V
Overvoltage Protect Hysteresis
20
mV
Auxiliary Feedback Threshold
Top Gate (TG) Drive 1, 2 Rise Time
Top Gate (TG) Drive 1, 2 Fall Time
Bottom Gate (BG) Drive 1, 2 Rise Time
Bottom Gate (BG) Drive 1, 2 Fall Time
SYNC/FCB Ramping Positive
C L = 3000pF
C L = 3000pF
C L = 3000pF
C L = 3000pF
0.525
0.6
40
40
50
40
0.675
V
ns
ns
ns
ns
Maximum Current Sense Voltage ( ? V SENSE(MAX) ) IPRG = Floating
(SENSE + – SW) IPRG = 0V
IPRG = V IN
Maximum Duty Cycle
In Dropout
l
l
l
110
70
185
122
82
202
97
135
95
220
mV
mV
mV
%
Soft-Start Time
Time for V FB1 to Ramp from 0.05V to 0.55V
0.6
0.8
1
ms
Oscillator and Phase-Locked Loop
Oscillator Frequency
Unsynchronized (SYNC/FCB Not Clocked)
PLLLPF = Floating
PLLLPF = 0V
PLLLPF = V IN
480
260
650
550
300
750
600
340
825
kHz
kHz
kHz
Phase-Locked Loop Lock Range
SYNC/FCB Clocked
Minimum Synchronizable Frequency
Maximum Synchronizable Frequency
l
l
850
200
1150
250
kHz
kHz
Phase Detector Output Current
Sinking
Sourcing
f OSC > f SYNC/FCB
f OSC > f SYNC/FCB
–4
4
μA
μA
PGOOD Output
PGOOD Voltage Low
I PGOOD Sinking 1mA
140
mV
PGOOD Trip Level
V FB with Respect to Set Output Voltage
V FB < 0.6V, Ramping Positive
V FB < 0.6V, Ramping Negative
V FB > 0.6V, Ramping Negative
V FB > 0.6V, Ramping Positive
–13
–16
7
10
–10.0
–13.3
10.0
13.3
–7
–10
13
16
%
%
%
%
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 LTC3836 is guaranteed to meet speci?ed performance from
0°C to 85°C. Speci?cations over the –40°C to 85°C operating range are
assured by design, characterization and correlation with statistical process
controls.
Note 3: T J is calculated from the ambient temperature T A and power dissi-
pation P D according to the following formula: T J = T A + (P D ? θ JA °C/W)
Note 4: Dynamic supply current is higher due to gate charge being
delivered at the switching frequency.
Note 5: The LTC3836 is tested in a feedback loop that servos I TH to a
speci?ed voltage and measures the resultant V FB voltage.
Note 6: Peak current sense voltage is reduced dependent on duty cycle to
a percentage of value as shown in Figure 1.
3836fb
3
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