Techcode®
DATASHEET
40Vin 6A 2-Outputs Buck Converter
TD1489
General Description
Features
TD1489 is a Synchronous Buck Circuit with two current sense
pins suitable for many multi‐output applications. It is
designed to allow for operating a wide supply voltage range
from 4.7V to 40V.This IC can operate in both Constant
Current (CC) and Constant Voltage (CV) modes.
TD1489 operates as a Buck Circuit providing a wide range of
outputs at Constant Voltage (CV) from 4.7V to 40V and the
output current as high as 6A or above. It has a Constant
Current (CC) mode so that output current can be set
externally and at an accuracy of ±4%.
The current mode control and external compensation makes
feedback control have good line and load regulation with
flexible external design.
Pin Configurations
Vin: 4.7V to 40V
Vout: 3V to 28V; typical at 5V
Precision CC/CV Mode Control
Burst/PFM Mode for Increased Light Load
Efficiency
2 outputs independent Constant Current setting
Hiccup mode when output voltage below 50%
normal output voltage
Protection:
NMOS peak current limit: accuracy:~20%
Output short protection: reduce input current to
less than 20mA (RMS)
Output FB OVP (125% VFB), only turn off High side
MOS.
Temperature shutdown (OTP)
Adjustable Output Cable Resistance Compensation
Switching Frequency: 125k+25k
Integrated Power MOSFET
QFN32L Package
Applications
Car Charger
High‐Brightness Lighting
General‐Purpose DC/DC Application
Figure1 Pin Configuration of TD1489(Top View)
July 7, 2019. Techcode Semiconductor Limited www.techcodesemi.com
1
Techcode®
DATASHEET
40Vin 6A 2-Outputs Buck Converter
TD1489
Pin Description
Pin Number
Pin Name
Description
1,2,3, 32
PGND
Power Ground pin.
4, 29,30,31,33
SW
Inductor terminal.
5,15,16,17,20
NC
Not connected
6,7,8,9,10,11,34
IN
Power input
12
BST
Internal High Side Driver Power Bias which is typically 5V above Vin. A typical 0.1uF
capacitor is used connecting between BST and SW pins.
13
VIN
Supply input
14,21,26,28,35
AGND
Signal Ground for The IC.
18
ISP
Input Current Sense.
19
ISN
Input Current Sense.
22
CS1
Current sense of the 1st output.
23
CS2
Current sense of the 2nd output.
24
COMP
Error Amplifier Output. The Converter stability compensation network is placed.
25
FB
Feedback input with reference to 1.20V. It can set output voltage.
27
VDD
Internal 5v power supply, a 1uF (or more) capacitor is connected between this pin
and GND.
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2
Techcode®
DATASHEET
40Vin 6A 2-Outputs Buck Converter
TD1489
Function Block
Figure 2 Function Block Diagram of TD1489
Absolute Maximum Ratings
Symbol
Supply Input Voltage
Rating
‐0.3 to +40
Unit
VIN
Parameter
ISP,ISN to VIN
‐0.3 to +0.3
V
BST to SW
‐0.3 to +6
V
SW to GND
V
BST to GND
‐0.3 to VIN+0.6
VSW‐0.3 to VSW+6
V
VDD,VFB,ISET,COMP,CS1‐2 to GND
‐0.3 to +6
V
ESD
HBM (Human Body Mode)
2K
V
θJA
Thermal Resistance from Junction to ambient
40
ºC/W
V
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Techcode®
DATASHEET
40Vin 6A 2-Outputs Buck Converter
TD1489
Recommended Operating Conditions
Symbol
Parameter
Rating
Min.
Typ.
Max.
VIN
Supply Voltage
4.7*
‐
40
V
VOUT
Output voltage range
3
‐
28
V
IOUT
Output current range
‐
‐
8
A
TOP
Operating Temperature
‐40
‐
85
ºC
TSTG
Storage Temperature Range
‐65
‐
150
ºC
TJ
Junction Temperature
‐40
‐
150
ºC
TSDR
Maximum Lead Soldering Temperature, 10 Seconds
260
Unit
ºC
Note: * when supply voltage is around 5V, output load current should be less than 5A.
Electrical Characteristics
VIN=12V, TA=25°C (unless otherwise specified).
Symbol
VIN
Characteristic
Test conditions
Min
Supply Voltage
4.7
IIN
Supply Input Current
Vout=5V,No load
VUP
VIN UVLO Turn ON
VHYS
VIN UVLO Hysteresis
Typ
Max
Unit
‐
40
V
1
1.7
3.5
mA
VIN Rising
3.5
4.0
4.5
V
VIN Falling
‐
0.6
‐
V
VIN UVLO
Feedback voltage
VFB
Feedback voltage
1.176
1.20
1.224
V
Tolerance
‐2
‐
2
%
Soft Start time
‐
6
‐
ms
FSW
Switch frequency
100
125
150
KHz
TON
Minimum On‐Time
‐
100
‐
ns
D
Duty cycle
‐
‐
97
%
VTHCC
CC threshold
65
68
71
mV
IFB
Cable compensation Current
CS1‐2=68mv
‐
2
‐
uA
Soft Start
Oscillator
Current sense
POWER MOSFET
High Side MOSFET Resistance
‐
14
‐
mΩ
Low Side MOSFET Resistance
‐
14
‐
mΩ
Thermal Shutdown(OTP)
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Techcode®
DATASHEET
40Vin 6A 2-Outputs Buck Converter
TD1489
TSD
Temperature Rising
‐
150
‐
ºC
THYS
OTP Hysteresis
‐
20
‐
ºC
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Techcode®
DATASHEET
40Vin 6A 2-Outputs Buck Converter
TD1489
Typical Application Circuit
Vin
R2
17
14
6
IN
7
IN
8
IN
9
IN
10
IN
11
IN
19
R3
4.7
ISN
VIN
35
13
U1
GND
0.005
R1
4.7
C2
0.1uF
18
220uF
C1
10uF
ISP
EC1
AGND
IN
BST
C3
2.2uF
26
20
CS1
R4
23
150
AGND
VDD
SW
SW
TD1489
AGND
SW
NC
SW
PGND
PGND
(optional)
L3
22uH
Output1
30
CS1
29
C9
1uF
4
EC2
470uF
R7
20K/1%
R9
25mΩ/1%
GND
1
R8
6.2K/1%
2
Output2
3
CS2
GND
32
FB
R10
25mΩ/1%
25
NC
15
16
NC
COMP
PGND
24
NC
5
21
C5
2.2uF
28
150
AGND
CS1
AGND
22
31
C8
0.1uF
FB
PGND
CS2
33
VDD
1N4148
CS2
C4
2.2uF
R5
D1
12
NC
SW
VDD 27
34
FB
GND
C6
220pF
GND
C7
3.3nF
R6
360k
GND
Figure 3 2‐outputs with CC(CS1 and CS2)
Typical Efficiency
Output current(Iout1+Iout2)(A)
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Techcode®
DATASHEET
40Vin 6A 2-Outputs Buck Converter
TD1489
Function Description
TD1489 operates in a peak‐current–mode control to regulate
the output voltage. It integrates a monolithic synchronous,
rectified, step‐down, switch‐mode converter with internal
power MOSFETs. It offers a compact solution to achieve 5A of
continuous output current over a wide input‐supply range
with excellent load and line regulation. The internal clock
initiates the PWM cycle, which turns on the integrated high
side power MOSFET. The high‐side MOSFET remains on until
its current reaches the value set by the COMP voltage. When
the power switch is off, it remains off until the next clock
cycle begins.
CC/CV Mode Control
TD1489 provides CC/CV function. The Constant output
Current control Mode and Constant output Voltage control
Mode.
Output Voltage Setting
VFB is the feedback pin and connected to the non‐inverting
of error amplifier input. The output voltage is adjustable from
1.2V to 28V with a resistor‐divider connected with VFB GND
and converter’s output. Using 1% or better resistors for the
resistor‐divider is recommended.
The output voltage is determined by the equation:
VOUT=VFB*(1+R1/R2)=1.2V*(1+R1/R2)
FB UVP
For TD1489, Hiccup Mode of Under Voltage Protection (UVP)
is provided. If cc mode is triggered or over current
protection(OCP)/short current protection(SCP) occur, the
output voltage will be pulled down quickly.
When FB105%*1.2V or FB
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