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Noveltek

NT3875A Datasheet Preview

NT3875A Datasheet

Wide Input Range CC/CV Step Down Converter

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Conceptual
NT3875A/B
Wide Input Range CC/CV Step Down Converter
General Description
Features
The NT3875 is a step down PWM converter with driving a
output current up to 2A (NT3875A) a nd 1A (NT3875B)
without a dditional tra nsistor. It is de signed to allow f or
operating a wide supply voltage rnage from 8Vto 40V. The
external shutdown function can be controlled by logic level
to pull COMP/EN pin down, and then comes into standby
mode. The external compensation makes feedback control
have good line and load regulation with flexible extern al
design.
TheNT3875 features a programmable CV/CC mode control
function s. The CV mode (con stant voltage) function
provides a regulated voltage output a nd the CC mode
(constant current) function provide s a current li mitation
function. The CC current value is set by external resister
during current sense amplifier input stage.
The NT3875 is suita ble for the DC/DC switching power
applications when requested the current lmi it function.The
devices are available in SOP-8L and PSOP-8L packages
and require very few external devices for operation.
Car Charger
Portable Charger Devices
Applications
VIN Operate with 8V ~ 40V Supply V oltage
VOUT Accura cy (Vref =1.2V) +1.0% Over Line
Voltage
CC / CV Mode Control (Constant Current and
Constant Voltage)
+/- 5% Current Limit Accuracy
Output Short Circuit Protection
Output Over Voltage Protection (~120%)
Over Temperature Prote ction
Internal Soft Start ~ 7ms
Fixed Frequency 120 KHz
UVLO Protection (min=6V, typ=7V, max=8V)
Duty Cycle Range (0~90%)
Single Pin to External Compensation and
Shutdown Control
Integrated Power N-MOSFET
Rds_on=150m ohm for NT3875A
Rds_on=240m ohm for NT3875B
(P)SOP- 8L Package
High-Brightness Lighting
Ordering Information
General-Purpose DC/DC Converters with Current
Limit
Oreder Number
NTL3875ASA8
Pkackag
SAOP-8
Remar
Output Current = 2
NTL3875ASW8 PASOP-8
Output Current = 2
NTL3875BSA8 SAOP-8
Output Current = 1
Note: NT products are compatible with the current IPC/
JEDEC J-STD-020 requirement. They are halogen-free,
RoHS compliant and 100% matte tin (Sn) plating that are
suitable for use in SnPb or Pb-free soldering processes.
Pin Configuration
VCC
FB
COMP/EN
GND
1 8 LX
2 7 BST
3 6 ISEN-
4 5 ISEN+
SOP-8L/ PSOP-8L
Noveltek Semiconductor Corp., http://www.noveltek-semi.com
Rev. C30, File Name: NT3875-DS-C3000
1
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Noveltek

NT3875A Datasheet Preview

NT3875A Datasheet

Wide Input Range CC/CV Step Down Converter

No Preview Available !

Conceptual
NT3875A/B
Typical Application Circuit
VIN BST
VCC
LX
COMP/EN
ISEN+
R3 ISEN-
GND
FB
RS VOUT
0R 0R
R1
R2
Functional Pin Description
No. Pin Name Pin Function
1
VCC
Power Supply Input. Bypass this pin with a 10uF ceramic capacitor to GND, placed as close
to the IC as possible.
Feedback Pin. The voltage at this pin is regulated to 1.2V. Connect to the resistor divider
2 FB between output and GND to set the output voltage.
Error Amplifier Output. This is the output of the error amplifier (EA) and the non-inverting input
3
COMP/EN
of the PWM comparator. Use this pin in combination with the VSEN pin to compensate the voltage
control feedback loop of the converter. Pulling COMP/EN to a level below 0.4V nominal disables
the controller, causes the oscillator to stop, and makes the UGATE and LGATE outputs held low.
Ground. Connect this pin to a large PCB copper area for best heat dissipation, Return VSEN,
4 GND and COMP to this GND and connect this GND to power GND at a single point for best noise
immunity.
5 ISEN+ The Current Sense Input (+) Pin.
6 ISEN- The Current Sense Input (-) Pin.
7
BST
Bootstrap Pin. This provides power to the internal higher MOSFET gate driver. Connect a 10nF
capacitor from BST pin to LX pin.
8X L
Power Switching Output to External Inductor.
Noveltek Semiconductor Corp., http://www.noveltek-semi.com
Rev. C30, FileName: NT3875-DS-C3000
2


Part Number NT3875A
Description Wide Input Range CC/CV Step Down Converter
Maker Noveltek
Total Page 8 Pages
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