LTC1159CS-5 Linear Technology, LTC1159CS-5 Datasheet - Page 5

• Manufacturer Part Number: LTC1159CS-5
• Description: IC SW REG STEP-DOWN 5V 16-SOIC
• Manufacturer: Linear Technology
• Type: Step-Down (Buck)r

Specifications of LTC1159CS-5

• Internal Switch(s): No
• Synchronous Rectifier: Yes
• Number Of Outputs: 1
• Voltage - Output: 5V
• Current - Output: 50mA
• Frequency - Switching: 250kHz
• Voltage - Input: 4 ~ 40 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 16-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Power - Output: -

PI FU CTIO S
TYPICAL PERFOR A CE CHARACTERISTICS
V
SGND: Small-Signal Ground. Must be routed separately
from other grounds to the (–) terminal of C
PGND: Driver Power Grounds. Connect to source of N-
channel MOSFET and the (–) terminal of C
V
switch, and supply inputs for driver and control circuits.
The driver and control circuits are powered from the higher
of the 4.5V regulator or EXTV
decoupled to power ground.
C
operating frequency. (The frequency is also dependent on
the ratio V
I
parator threshold increases with the I
V
receives the feedback voltage from an external resistive
divider used to set the output voltage.
SENSE
the output voltage in fixed output versions. The SENSE
is also the (–) input of the current comparator.
TH
IN
CC
T
FB
600
500
400
300
200
100
: External capacitor C
: Gain Amplifier Decoupling Point. The current com-
U
: Main Supply Input Pin.
: For the LTC1159 adjustable version, the V
: Outputs of internal 4.5V linear regulator, EXTV
0
EXTV
0
–
: Connects to internal resistive divider which sets
CC
OUT
U
Switch Drop
5
SWITCH CURRENT (mA)
/V
IN
.)
10
U
T
from this pin to ground sets the
15
W
LTC1159 • TPC07
CC
voltage. Must be closely
U
20
TH
pin voltage.
IN
OUT
.
60
50
30
80
70
40
20
10
0
0
.
Off-Time vs V
FB
1
–
LTC1159-3.3
pin
pin
OUTPUT VOLTAGE (V)
CC
2
OUT
SENSE
in offset between the SENSE
tion with R
N-Gate: High Current Drive for the Bottom N-Channel
MOSFET. The N-Gate pin swings from ground to V
P-Gate: Level-Shifted Gate Drive Signal for the Top
P-Channel MOSFET. The voltage swing at the P-gate pin is
from V
P-Drive: High Current Gate Drive for the Top P-Channel
MOSFET. The P-drive pin(s) swing(s) from V
CAP: Charge Compensation Pin. A capacitor to V
vides charge required by the P-gate level-shift capacitor
during supply transitions. The charge compensation ca-
pacitor must be larger than the gate drive capacitor .
SHDN1: This pin shuts down the control circuitry only (V
is not affected). Taking SHDN1 pin high turns off the
control circuitry and holds both MOSFETs off. This pin
must be at ground potential for normal operation.
SHDN2: Master Shutdown Pin. Taking SHDN2 high shuts
down V
3
LTC1159-5
IN
+
CC
: The (+) Input for the Current Comparator. A built-
LTC1159 • TPC08
4
to V
and all control circuitry.
SENSE
IN
5
– V
LTC1159-3.3/LTC1159-5
, sets the current trip threshold.
CC
.
120
100
160
140
60
40
80
20
0
0
Current Sense Threshold Voltage
+
and SENSE
20
TEMPERATURE ( C)
40
–
pins, in conjunc-
THRESHOLD
THRESHOLD
LTC1159
60
MAXIMUM
MINIMUM
CC
to ground.
LTC1159 • TPC09
80
CC
CC
pro-
.
5
100
CC