THV81800_Rev.1.00_E
THV81800
8A 1ch Buck Converter Module
Description
Features
THV81800 is a synchronous buck switching
regulator Power supply module of Maximum output
current 8A. It is possible to design a power only
with a minimum of external components for built-in
MOSFET and Inductor.
The synchronous rectifier technology provides
high efficiency more than 90%. Utilizing the latest
and THine’s unique architecture “Transphase”,
THV81800 achieves ultra quick transient response.
Soft start by SS pin makes constant and stable soft
start curve not depend on the load fluctuation.
THV81800 also has the Power-good function and
the Off-delay function to facilitate the setting of
On/Off sequence.
・ Synchronous rectifier DC/DC converter
・ Input voltage range(Vcc)：7.5V ~ 28V
・ Output voltage range(Vout)：0.85V ~ 4.0V
・ Maximum output current(Iout)：8.0A
・ Feed back voltage accuracy：±1%
・ Oscillation frequency：500 kHz
・ Over current protection
・ Short circuit protection (latch function)
・ Under voltage lockout function
・ Power-good function
・ Off Delay function
・ Programmable soft start
・ Power standby indication
・ Thermal shutdown
・ 15mm x 15mm LGA Package
Applications
・ Microprocessor core / ASIC / FPGA / DSP
THV81800
Vout
Iout
Vcc 7.5V ～ 28 V
VCC
0.85 V ～4.0V
8A
OUT
CTL
REG
FB
PSI
PGOOD
PGOOD
AG
OFFDELAY
SS
GND
Typical Applications
“Transphase” is THine’s registered trademark.
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Absolute maximum ratings
Parameter
Symbol
Min
Max
Units
VCC voltage
Vcc
-0.3
30
V
CTL voltage
Vctl
-0.3
30
V
PSI voltage
Vpsi
-0.3
5.5
V
-0.3
5.5
V
FB, SS, Vout
FB, SS, OUT, OFFDELAY, PGOOD voltage
OFFDELAY,PGOOD
Junction Temperature
Tj
-
125
ºC
Storage Temperature
Tstg
-55
125
ºC
Symbol
Min
Max
Unit
VCC voltage
Vcc
7.5
28
V
Output voltage
Vout
0.85
4.0
V
Output current
Iout
-
REG current
Ireg
-
30
mA
Operating Temperature
Ta
-40
+85
ºC
Recommended Operation Conditions
Parameter
8
*1
A
*1 The maximum output current is limited to Tj ≦ 125 ℃.
Block Diagram
THV81800
Vcc Input
Control IC
CTL Input
CTL
PSI Input
VCC
PSI
REG Output
OFFDELAY
OFFDELAY
SS
REG
PGOOD Output
PGOOD
SS
GND
FB
OUT
FB
AG
GND
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THV81800_Rev.1.00_E
Electrical Characteristics（Vcc=12V, Vctl=5V, Vpsi=5V, Vout=3.3V, Ta=25ºC unless otherwise noted.）
Parameter
Symbol
Condition
Typ
Max
Units
-
38
76
mA
Operation Current 1
Icc_1
Vcc = 28V,
Operation Current 2
Icc_2
Vcc = 28 V,IOUT = 0, Vpsi= 0V
-
2.2
5.0
mA
Stand-by current
Ist
Vctl = 0V
-
38
75
μA
Maximum Output Current
IOUT_DC
-
-
8.0 *1
A
OCP threshold
IOUT_OCP
-
11
-
A
UVLO threshold
V_UVLO
6.0
6.5
7.0
V
UVLO hysteresis
V_UVLO hys
-
0.17
-
V
Io= 3A
-
90
-
%
Efficiency
Vcc＝
L
IOUT = 0
Min
→
H
Output Line Regulation
⊿VOUT(Line)
Vcc= 7.5V to 28 V, Io= 3 A
-
3.0
-
%
Output Load Regulation
⊿VOUT(Load)
Io= 0 A to 8A
-
1.0
-
%
REG output voltage
V_REG
Ireg=0.1mA
4.75
5.0
5.25
V
REG output current
Ireg
-
-
30
mA
Feed Back Voltage
V_FB
0.841
0.85
0.859
V
Feed Back Resistance
RFBL
9.88
10
10.12
kΩ
SCP delay time
tscp
3.5
4.1
4.7
ms
CTL OFF threshold voltage
VIL_CTL
-
-
0.7
V
CTL ON threshold voltage
VIH_CTL
1.5
-
-
V
PSI OFF threshold voltage
VIL_PSI
-
-
1.0
V
PSI ON threshold voltage
VIH_PSI
4.0
-
-
V
CTL high level input current
IIH_CTL
Vctl=3.3V
0.5
2.0
4.0
μA
PSI high level input current
IIH_PSI
Vpsi=5V
6
12.5
25
μA
OFFDELAY Sink current
I_OFFD
2.4
4.0
6.0
μA
Off delay time
TOFFD
COFFD = 0.01uF
4.2
8.5
13
ms
Soft start time
Tss
CSS = none
2.1
3.5
5.2
ms
Soft start current
I_SS
1.2
2.0
3.0
μA
Power good threshold voltage
VT_PG
0.65
0.70
0.75
V
Power good hysteresis voltage
V_PGhys
Detect at FB pin
-
0.1
-
V
Power good output ON resistance
RON_PG
PGOOD= 0.1 V
-
1.0
2.0
kΩ
Power good output off leak current
Ileak_PG
VPGOOD = 5V
-
0
1.0
uA
Oscillation Frequency
FOSC
Vpsi=5V
440
500
560
kHz
Minimum Oscillation Frequency
FOSCMIN
Vpsi=0V
7.0
8.0
9.0
kHz
FB – AG
Detect at FB pin
FB ＝ L→H
*1 The maximum output current is limited to Tj ≦ 125 ℃.
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THV81800_Rev.1.00_E
4
5
6
7
8
9
10
NC
3
NC
2
TEST1
CTL
1
11
12
D
TEST5
NC
C
TEST4
TEST2
B
NC
A
TEST3
VCC
NC
Pin description（Top view）
NC
TEST6
E
REG
F
PGOOD
G
PSI
H
OFF_DELAY
J
SS
K
AG
GND
OUT
L
FB
M
NC
Pin description
Pin
Symbol
I/O
Vcc
―
Power Supply
GND
―
Ground
OUT
O
Output
A7
CTL
I
Enable pin. Active at high level.
A9
TEST1
―
Non Connection.
A12
TEST2
―
Non Connection.
B8
TEST3
―
Non Connection.
B10
TEST4
―
Non Connection.
B11
TEST5
―
Non Connection.
D12
TEST6
―
Non Connection.
E12
REG
O
5V regulator output. Internal power supply.
F12
PGOOD
O
Power good output. N-MOS open drain output.
G12
PSI
I
A1 ～ A6, B1 ～ B6
C1 ～ C6
Function
D1 ～ D6, E1 ～ E7
F1 ～ F9, G1 ～ G9
H1 ～ H9
J1 ～ J10, K1 ～ K11
L1 ～ L11, M1 ～
M11
Power standby Indication. Applying low level voltage to this pin, IC goes into the
light load mode. Applying high level, IC operates in the synchronous mode.
H12
OFFDELAY
I
Shut-off delay time setting.
J12
SS
I
Soft start time setting pin.
K12
AG
―
Analog Ground. AG pin should be connected to GND.
L12
FB
O
Output voltage feedback.
NC
―
Non Connection.
A8,A10,A11
B12,C9,C12,M12
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THV81800_Rev.1.00_E
Function Description
●Under voltage Lockout （UVLO）
THV81800 has the built-in Under voltage Lockout circuit to prevent the device from malfunction at low
input voltages. UVLO stops switching operation and soft start operation, until Vcc voltage rises up to
6.5V(typ). Having the hysteresis circuit, UVLO stops switching operation and start to discharge SS pins,
when Vcc voltage falls down under 6.33V(typ).
●Thermal Shut Down （TSD）
THV81800 has the built-in Thermal Shutdown circuit to prevent damages caused by excessive heat. When
the junction temperature Tj of control IC reaches 125 ºC (typ), TSD circuit stops output voltage and 5V
regulator. When Tj falls down (20 ºC typical hysteresis), THV81800 restart.
●Over Current Protection （OCP）
THV81800 has the built-in Over Current Protection circuit to limit over current caused by abnormal load
current, etc. When the output current which flows to a OUT terminal is exceed 8.6A (typ), the over current
protection function is restricted to the output current by Pulse -by-pulse. When the output current increased in
more than 1/2 of a output ripple current, output is turned off. Over Current (Iout_ocp) is dependent on input
voltage (Vcc) and output voltage (Vout), and calculated as following.
oc t
out
●Short Circuit Protection （SCP）
SCP circuit is activated, when the output shorted continues. Feedback voltage drops less than 0.6V(typ), SCP
detects a short circuit. If such condition continues for more than 4.1ms(typ), the device stops switching
operation and go into latch state. The latch state will be released by restarting to apply voltage on CTL pin or
Vcc pin.
●Power Good (PGOOD)
PGOOD pin is NMOS open drain output. Power Good is a function to notify external circuits that the output
voltage has reached to the normal voltage, and available as a sequence control or a reset signal for
micro-processor. When the feedback voltage exceeds 0.7V(typ) , PGOOD pin is turned from Low
level(NMOS on) to High impedance(NMOS off). When the feedback voltage drops 0.6 V(typ), PGOOD pin
is turned to Low level. If CTRL pin is low level, PGOOD also be low level. When usually using, recommend
to use a 5V power supply of a REG Pin. Or it's possible to pull up a PGOOD pin using the outside power
supply. Please note following when using the outside power supply.
First : When Vcc voltage is less than 2.5V, PGOOD pin is High impedance(NMOS off) even though the
out ut voltage doesn’t reach to the user defined voltage.
Second : When Vcc voltage exceeds 2.5V, PGOOD pin is turned Low level.
Third : When feedback voltage reaches to 0.7V(typ) after the exceeded UVLO threshold, PGOOD pin is
High impedance(NMOS off) again.
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THV81800_Rev.1.00_E
●Out ut oltage Setting
THV81800 output voltage detects the output ripple voltage(Vrip) and output voltage lower
limit(Vout_bottom) defined as following formula.
V_FB = 0.85V,
R FB kΩ = Output voltage setting resistance of between FB pin and OUT pin.
Output voltage at the continuous mode is calculated as following formula, adding the average of the ripple
voltage. Please contact us if you have questions about the output ripple voltage.
The relation between output voltage(Vout) and output voltage setting resistance(R_FB) as following.
Vout vs RFB
Vout [V]
4
3
2
1
0
0
10
20
30
40
RFB [kΩ]
●Power Stand-by Indicator (PSI)
Continuous/Light Load modes are selectable by PSI pin, High or Low. High = continuous mode, Low = light
load mode. PSI pin is held Low and stops the operation of Low side FET in the light load mode.
●Soft Start（SS）
THV81800 has soft start circuit allows a gradual rising of output voltage to prevent overshooting of output
voltage and high inrush current during start up. The initial setting of the output voltage rise up time is
3.5msec(typ.). The output rise time can be controlled by the choice of soft-start capacitor(Css).
●OFF Delay (OFFDELAY)
Off Delay function works to set the delay time from when Low level voltage is applied on CTL pin till the
device goes into standby state. The delay time can be set by connecting a capacitor between OFFDELAY pin
and GND.
●Output Pull-Down
THV81800 has a built-in Output Pull-Down function to shorten the output fall time. When CTL pin is low,
turn on an internal transistor and discharge the output capacitor.
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Package Outline
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Notices and Requests
1. The product specifications described in this material are subject to change without prior notice.
2. The circuit diagrams described in this material are examples of the application which may not always
apply to the customer's design. We are not responsible for possible errors and omissions in this material.
Please note if errors or omissions should be found in this material, we may not be able to correct them
immediately.
3. This material contains our copyright, know-how or other proprietary. Copying or disclosing to third
parties the contents of this material without our prior permission is prohibited.
4. Note that if infringement of any third party's industrial ownership should occur by using this product, we
will be exempted from the responsibility unless it directly relates to the production process or functions of
the product.
5. Product Application
5.1 Application of this product is intended for and limited to the following applications : audio-video
device, office automation device, communication device, consumer electronics, smartphone, feature phone,
and amusement machine device. This product must not be used
5.2 This product is not intended to be used as an automotive part, unless the product is specified as a
product conforming to the demands and specifications of ISO/TS16949 ("the Specified Product") in this
data sheet THine Electronics, nc “THine” acce ts no liabilit whatsoever for an roduct other than
the Specified Product for it not conforming to the aforementioned demands and specifications.
5.3 THine accepts liability for demands and specifications of the Specified Product only to the extent that
the user and THine have been previously and explicitly agreed to each other.
6. Despite our utmost efforts to improve the quality and reliability of the product, faults will occur with a
certain small probability, which is inevitable to a semi-conductor product. Therefore, you are encouraged
to have sufficiently redundant or error preventive design applied to the use of the product so as not to have
our product cause any social or public damage.
7. Please note that this product is not designed to be radiation-proof.
8. Testing and other quality control techniques are used to this product to the extent THine deems necessary
to support warranty for performance of this product. Except where mandated by applicable law or deemed
necessar b THine based on the user’s request, testing of all functions and erformance of the roduct is
not necessarily performed.
9. Customers are asked, if required, to judge by themselves if this product falls under the category of
strategic goods under the Foreign Exchange and Foreign Trade Control Law.
10. The product or peripheral parts may be damaged by a surge in voltage over the absolute maximum ratings
or malfunction, if pins of the product are shorted by such as foreign substance. The damageｓ may cause a
smoking and ignition. Therefore, you are encouraged to implement safety measures by adding protection
devices, such as fuses.
THine Electronics, Inc.
[email protected]
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