Linear Technology LTC3350, Руководство пользователя

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LTC3350
4
3350fc
For more information www.linear.com/LTC3350
elecTrical characTerisTics
The
l
denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at T
A
= 25°C (Note 2). V
IN
= V
OUT
= 12V, V
DRVCC
= V
INTVCC
unless otherwise
noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Switching Regulator
V
IN
Input Supply Voltage
l
4.5 35 V
I
Q
Input Quiescent Current (Note 4) 4 mA
V
CAPFBHI
Maximum Regulated V
CAP
Feedback Voltage V
CAPDAC
Full Scale (1111b)
l
1.188
1.176
1.200
1.200
1.212
1.224
V
V
V
CAPFBLO
Minimum Regulated V
CAP
Feedback Voltage V
CAPDAC
Zero Scale (0000b) 0.628 0.638 0.647 V
I
CAPFB
CAPFB Input Leakage Current V
CAPFB
= 1.2V
l
–50 50 nA
V
OUTFB
Regulated V
OUT
Feedback Voltage
l
1.188
1.176
1.200
1.200
1.212
1.224
V
V
V
OUTFB(TH)
OUTFET Turn-Off Threshold Falling Threshold 1.27 1.3 1.33 V
I
OUTFB
OUTFB Input Leakage Current V
OUTFB
= 1.2V
l
–50 50 nA
V
OUTBST
V
OUT
Voltage in Step-Up Mode V
IN
= 0V
l
4.5 35 V
V
UVLO
INTV
CC
Undervoltage Lockout Rising Threshold
Falling Threshold
l
l
3.85
4.3
4
4.45 V
V
V
DRVUVLO
DRV
CC
Undervoltage Lockout Rising Threshold
Falling Threshold
l
l
3.75
4.2
3.9
4.35 V
V
V
DUVLO
V
IN
– V
CAP
Differential Undervoltage Lockout Rising Threshold
Falling Threshold
l
l
145
55
185
90
225
125
mV
mV
V
OVLO
V
IN
Overvoltage Lockout Rising Threshold
Falling Threshold
l
l
37.7
36.3
38.6
37.2
39.5
38.1
V
V
V
VCAPP5
Charge Pump Output Voltage Relative to V
CAP
, 0V ≤ V
CAP
≤ 20V 5 V
Input Current Sense Amplifier
V
SNSI
Regulated Input Current Sense Voltage
(VOUTSP – VOUTSN)
l
31.36
31.04
32.00
32.00
32.64
32.96
mV
mV
Charge Current Sense Amplifier
V
SNSC
Regulated Charge Current Sense Voltage
(ICAP – VCAP)
V
CAP
= 10V
l
31.36
31.04
32.00
32.00
32.64
32.96
mV
mV
V
CMC
Common Mode Range (ICAP, VCAP) 0 20 V
V
PEAK
Peak Inductor Current Sense Voltage
l
51 58 65 mV
V
REV
Reverse Inductor Current Sense Voltage Step-Down Mode
l
3.867 7 10 mV
I
ICAP
ICAP Pin Current Step-Down Mode, V
SNSC
= 32mV
Step-Up Mode, V
SNSC
= 32mV
30
135
µA
µA
Error Amplifier
g
MV
V
CAP
Voltage Loop Transconductance 1 mmho
g
MC
Charge Current Loop Transconductance 64 μmho
g
MI
Input Current Loop Transconductance 64 μmho
g
MO
V
OUT
Voltage Loop Transconductance 400 μmho
Oscillator
f
SW
Switching Frequency R
T
= 107k
l
495
490
500
500
505
510
kHz
kHz
Maximum Programmable Frequency R
T
= 53.6k 1 MHz
Minimum Programmable Frequency R
T
= 267k 200 kHz