LTC3632 LINER [Linear Technology], LTC3632 Datasheet - Page 3

• Manufacturer Part Number: LTC3632
• Description: High Effi ciency, High Voltage 20mA Synchronous Step-Down Converter
• Manufacturer: LINER [Linear Technology]

ELECTRICAL CHARACTERISTICS
junction temperature range, otherwise specifi cations are for T
SYMBOL
Input Supply (V
V
UVLO
OVLO
I
Output Supply (V
V
V
I
ΔV
Operation
V
I
V
I
I
t
I
R
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 LTC3632 is tested under pulsed load conditions such that T
LTC3632E is guaranteed to meet specifi cations from 0°C to 85°C junction
temperature. Specifi cations over the –40°C to 125°C operating junction
temperature range are assured by design, characterization and correlation
with statistical process controls. The LTC3632I is guaranteed over the
full –40°C to 125°C operating junction temperature range. Note that the
Q
FB
RUN
HYST
SS
INTSS
PEAK
IN
FB
HYST
RUN
HYSTL
ON
LINEREG
IN
PARAMETER
Input Voltage Operating Range
V
V
DC Supply Current (Note 3)
Feedback Comparator Trip Voltage
Feedback Comparator Hysteresis Voltage
Feedback Pin Current
Feedback Voltage Line Regulation
RUN Pin Threshold Voltage
RUN Pin Leakage Current
Hysteresis Pin Voltage Low
Hysteresis Pin Leakage Current
Soft-Start Pin Pull-Up Current
Internal Soft-Start Time
Peak Current Trip Threshold
Power Switch On-Resistance
FB
)
IN
IN
Active Mode
Sleep Mode
Shutdown Mode
Top Switch
Bottom Switch
)
Undervoltage Lockout
Overvoltage Lockout
CONDITIONS
V
V
Hysteresis
V
V
Hysteresis
V
V
V
V
RUN Rising
RUN Falling
Hysteresis
RUN = 1.3V
RUN < 1V, I
V
V
SS Pin Floating
I
500k Resistor from I
I
I
I
SET
SET
SW
SW
IN
IN
IN
IN
RUN
FB
FB
IN
HYST
SS
Rising
Falling
Rising
Falling
= 4.5V to 50V
Rising
= 1V
= –10mA
= 10mA
< 1.5V
Floating
Shorted to GND
= 0V
= 1.3V
The
J
≈ T
A
HYST
l
A
= 25°C (Note 2). V
.
denotes the specifi cations which apply over the full operating
= 1mA
maximum ambient temperature consistent with these specifi cations is
determined by specifi c operating conditions in conjunction with board
layout, the rated package thermal impedance and other environmental
factors. The junction temperature (T
temperature (T
the formula:
Note 3: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency. See Applications Information.
SET
T
impedance.
to GND
J
= T
A
+ (P
IN
A
D
, in °C) and power dissipation (P
= 10V, unless otherwise noted.
• θ
JA
), where θ
l
l
l
l
l
0.792
3.80
3.75
1.17
1.06
MIN
–10
–10
–10
4.5
4.5
54
52
40
3
8
JA
(in °C/W) is the package thermal
J
, in °C) is calculated from the ambient
0.800
0.001
4.15
4.00
1.21
1.10
0.07
0.75
TYP
150
125
110
5.5
5.0
2.5
56
54
12
50
25
10
2
3
5
0
0
0
D
, in Watts) according to
LTC3632
0.808
MAX
4.50
4.35
1.25
1.14
220
0.1
6.5
50
59
57
22
10
10
10
60
13
6
7
UNITS
3632fb
3
%/V
mV
mV
mV
mA
mA
mA
ms
μA
μA
μA
nA
nA
nA
μA
Ω
Ω
V
V
V
V
V
V
V
V
V
V