LTC1142HVCG#TRPBF Linear Technology, LTC1142HVCG#TRPBF Datasheet - Page 7

• Manufacturer Part Number: LTC1142HVCG#TRPBF
• Description: IC SW REG STEP-DOWN DUAL 28-SSOP
• Manufacturer: Linear Technology
• Type: Step-Down (Buck)r

Specifications of LTC1142HVCG#TRPBF

• Internal Switch(s): No
• Synchronous Rectifier: Yes
• Number Of Outputs: 2
• Voltage - Output: 3.3V, 5V
• Current - Output: 50mA
• Frequency - Switching: 250kHz
• Voltage - Input: 3.5 ~ 18 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 28-SSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -

NDRIVE 1 (Pin 6): High Current Drive for Bottom N-Channel
MOSFET, Section 1. Voltage swing at Pin 6 is from ground
to V
NC (Pins 7, 8): No Connection.
PDRIVE 2 (Pin 9): High Current Drive for Top P-Channel
MOSFET, Section 2. Voltage swing at this pin is from V
to ground.
V
decoupled to section 2 power ground, Pin 19.
C
sets the operating frequency for the section 2. (The actual
frequency is also dependent upon the input voltage.)
INTV
nominally 3.3V, can be decoupled to signal ground, Pin
18. Do not externally load this pin.
I
The section 2 current comparator threshold increases
with the Pin 13 voltage.
SENSE
comparator on section 2.
SENSE
Comparator. A built-in offset between Pins 15 and 14 in
conjunction with R
for this section.
V
external resistive divider used to set the output voltage for
section 2.
SHDN2 (Pin 17): When grounded, the section 2 regulator
operates normally. Pulling Pin 17 high holds both MOSFETs
off and puts section 2 in micropower shutdown mode.
Requires CMOS logic signal with t
Pin 17.
PI FU CTIO S
TH2
IN2
T2
FB2
U
(Pin 11): External capacitor C
IN1
(Pin 13): Gain Amplifier Decoupling Point, Section 2.
CC2
(Pin 16): This pin serves as the feedback pin from an
(Pin 10): Supply pin, section 2, must be closely
.
–
+
2 (Pin 15): The (+) Input to the Section 2 Current
2 (Pin 14): Connects (–) input for the current
(Pin 12) : Internal supply voltage for section 2,
U
SENSE2
U
sets the current trip threshold
T2
r
, t
from Pin 11 to ground
f
< 1 s. Do not “float”
IN2
SGND2 (Pin 18): The section 2 small-signal ground must
be routed separately from other grounds to the (–) termi-
nal of the section 2 output capacitor.
PGND2 (Pin 19): The section 2 driver power ground
connects to source of the N-channel MOSFET and the (–)
terminal of the section 2 input capacitor.
NDRIVE 2 (Pin 20): High Current Drive for Bottom
N-Channel MOSFET, Section 2. Voltage swing at Pin 20 is
from ground to V
NC (Pins 21, 22): No Connection.
PDRIVE 1 (Pin 23): High Current Drive for Top P-Channel
MOSFET, Section 1. Voltage swing at this pin is from V
to ground.
V
decoupled to section 1 power ground Pin 5.
C
sets the operating frequency for section 1. (The actual
frequency is also dependent upon the input voltage.)
INTV
nominally 3.3V, can be decoupled to signal ground, Pin 4.
Do not externally load this pin.
I
The section 1 current comparator threshold increases
with the Pin 27 voltage.
SENSE
current comparator on section 1.
TH1
LTC1142/LTC1142L/LTC1142HV
IN1
T1
(Pin 25): External capacitor C
(Pin 27): Gain Amplifier Decoupling Point, Section 1.
CC1
(Pin 24): Supply Pin, Section 1. Must be closely
–
1 (Pin 28): Connects to the (–) input for the
(Pin 26): Internal supply voltage for section 1,
IN2
.
T1
from Pin 25 to ground
7
IN1