TB7102F [TOSHIBA]
Step-down DC-DC Converter IC; 降压型DC -DC转换器IC
| 型号： | TB7102F |
| 厂家： | 
TOSHIBA |
| 描述： | Step-down DC-DC Converter IC |
| 文件： | 总13页 (文件大小：281K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
TB7102F
Toshiba BiCD Integrated Circuit Silicon Monolithic
TB7102F
Step-down DC-DC Converter IC
The TB7102F is a single-chip step-down DC-DC converter IC.
Equipped with a built-in high-speed and low on-resistance power
MOSFET, and utilizing a synchronous rectifier circuit, this IC can
achieve high efficiency.
Features
• Capable of high current drive (IOUT = maximum of 1 A),
using only a few external components
• High efficiency (η = 95% )
SON8-P-0303-0.65A
Weight : 0.017 g (typ.)
(@V = 5V, V
= 3.3V, and I
= 300 mA).
OUT
IN
OUT
• Operating voltage (V ) range: 2.7V to 5.5 V
IN
• High oscillation frequency of 1 MHz (typ.), making it possible to use small external components.
• Uses internal phase compensation, achieving high efficiency using only a few external components.
• A small surface mount-type ceramic capacitor can be used as an output smoothing capacitor.
• Housed in a small surface-mount package (PS-8) with low thermal resistance.
• Under voltage lock out (U.V.L.O), Heat protection, and Over Current Protection is built into.
Pin Assignment
Marking
Part number
PGND
L
X
1
2
3
4
8
7
6
5
7102
V
V
FB
IN
※
N.C
N.C
EN
・The dot (•) on the top surface indicates pin 1.
SGND
*: Lot number
* The Lot number comprises three numerals. The first numeral represents the last digit of the year of
manufacture, and the following two digits indicate the week of manufacture, beginning with 01 and continuing to
either 52 or 53.
Manufacturing week Code
(The first week of the year is 01,continuing up to 52 or 53)
Manufacturing year Code
(Last digit of the year of manufacture)
Due to its MOS structure, this product is sensitive to electrostatic discharge. Handle with care.
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TB7102F
How to Order
Product No.
Package Type and Capacity
TB7102F(TE85L,F)
Emboss Taping (3000pcs / reel )
Block Diagram
VIN
EN
Under Voltage lock out
Soft Start
Reference Volage
Current
Detection
+
-
OSCILLATOR
DRIVER
DRIVER
LX
PWM
Control
Logic
comparator
+
SLOPE
compensation
-
PGND
Phase
compensation
Error
amplifier
VFB
Heat
Protection
VCOMP
-
+
0.8V(TYP.)
SGND
Pin Descriptions
Pin No.
Pin Symbol
Pin Description
1
2
PGN
Power ground
V
Input pin. This pin is placed in the standby state if VENB = low. 1 μA or lower operating current.
IN
Enable pin. This pin is connected to the CMOS inverter. Applying 3.5 V or higher (@ V = 5 V)
IN
3
EN
to this pin starts the internal circuit switching control.
Signal ground
4
5
6
SGND
N.C.
No connection
N.C.
No connection
Output voltage feedback pin. This is connected to the internal error amplifier, which is supplied
with a reference voltage of 0.8 V (typ.).
7
8
V
FB
L
Switching pin. This pin is connected to high side Pch MOS FET and low side Nch MOS FET.
X
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TB7102F
Timing Chart
Normal operation
OSC
0
IOUT
0
VOUT
0
VCOMP
0
The peak switch current is determined
V
.
COMP
IL
0
VLX
0
T
ON
T
Overheat state operation
OSC
0
T
increase
ch
Hysteresis: 25°C (typ.)
Tch
VLX
Low Voltage operation
VIN
Hysteresis: 0.1 V (typ)
0
OSC
0
VLX
0
OSC : Internal oscillator output voltage
IOUT : Load current
VOUT : Output voltage
V
COMP : Output voltage of Error amplifier
IL
: Inductor current
: LX pin voltage
VLX
VIN
Tch
: Input pin voltage
: Channel temperature
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TB7102F
Absolute maximum Ratings (Ta = 25°C)
Characteristics
Input voltage
Symbol
Rating
-0.3～6
-0.3～6
-0.3～6
-0.3～6
Unit
V
V
IN
LX
FB
V
V
V
Switch pin voltage
V
Feedback pin voltage
Enable pin voltage
V
V
EN
-V
V
V
-V <0.3
EN IN
V
Input-enable pin voltage
Power dissipation (Note 1)
Operating temperature
Operating junction temperature
Channel temperature
EN IN
P
D
0.7
W
oC
oC
oC
oC
Topr
-40～85
-40～125
150
T
jopr
T
ch
T
stg
-55～150
Storage temperature
Note 2: Using continuously under heavy loads (e.g. the application of high temperature/current/voltage and the
significant change in temperature, etc.) may significantly reduce the reliability of this product
even if the operating conditions (i.e. operating temperature/current/voltage, etc.) are within the absolute
maximum ratings and the operating ranges.
Please consult the Toshiba Semiconductor Reliability Handbook
(“Handling Precautions”/Derating Concept and Methods) and individual reliability data (i.e. reliability test
report and estimated failure rate, etc) when designing the appropriate reliability while.
Thermal Resistance Characteristic
Characteristics
Symbol
Max
Unit
R
178.6 (Note 1)
°C /W
Thermal resistance, channel and ambient
th (ch-a)
(Note 1)
Glass epoxy board
Material : FR-4
25.4 × 25.4 × 0.8
(Unit: mm)
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2007-06-20
TB7102F
Electrical Characteristics (unless otherwise specified: Tj = 25°C and VIN = 2.7 to 5.5 V)
Test
circuit
Characteristics
Symbol
Min
Typ.
Max
Unit
Test condition
Operating supply voltage
VIN(OPR)
IIN(1)
－
－
－
2.7
－
5.5
0.9
V
VIN= 5V, VEN= 5V, VFB =5V
－
0.68
mA
Operating current
Standby current
VIN= 2.7V, VEN= 2.7V,
VFB =2.7V
IIN(2)
－
－
0.55
0.7
mA
IIN(STBY)(1)
IIN(STBY)(2)
VIH(EN)(1)
VIH(EN)(2)
VIL(EN)(1)
VIL(EN)(2)
IIH(EN)(1)
IIH(EN)(2)
VFB(1)
－
－
－
－
－
－
－
－
－
－
－
－
VIN= 5V, VEN= 0V
VIN= 2.7V, VEN= 0V
VIN= 5V
－
－
－
－
1
1
μA
μA
V
3.5
1.9
－
－
－
VIN= 2.7V
－
－
V
Enable pin threshold voltage
VIN= 5V
－
1.5
0.8
20
V
VIN= 2.7V
－
－
V
VIN= 5V, VEN= 5V
VIN= 2.7V, VEN= 2.7V
VIN= 5V, VEN= 5V
VIN= 2.7V, VEN= 2.7V
VIN= 5V, VEN= 5V
VIN= 2.7V, VEN= 2.7V
6
－
μA
μA
V
Enable pin input current
Feedback pin voltage
Feedback pin current
3
－
10
0.776
0.776
-1
0.8
0.8
－
0.824
0.824
1
VFB(2)
V
IFB(1)
μA
μA
mV/V
IFB(1)
－
-1
1
VIN= VEN= 2.7V～5.5V
VOUT=2.0V IOUT= 10mA
VIN=5V, VOUT=2.0V
Line regulation
Load regulation
LINE REG
－
－
3.2
10
－
LOAD REG
－
－
－
9
0.27
0.36
40
－
－
mV/A
Ω
IOUT= 10mA～500mA
R
－
VIN= 5V, VEN= 5V, ILX= 0.5A
DS(ON)(H)(1)
High-side on-state resistance
Low-side on-state resistance
VIN= 2.7V, VEN= 2.7V
ILX= 0.5A
VIN= 5V, VEN= 5V
ILX= 0.5A
VIN= 2.7V, VEN= 2.7V
ILX= 0.5A
R
Ω
DS(ON)(H)(2)
R
－
－
0.27
0.3
－
－
Ω
Ω
DS(ON)(L)(1)
R
DS(ON)(L)(2)
ILEAK(H)
ILEAK(L)
fOSC(1)
fOSC(2)
tss(1)
－
－
－
－
－
VIN= 5V, VEN= 0V, VLX= 0V
VIN= 5V, VEN= 0V, VLX= 5V
VIN= 5V, VEN= 5V
－
－
－
－
1
-1
1
μA
μA
High-side leakage current
Low-side leakage current
0.85
0.85
1
1.15
1.15
－
MHz
MHz
ms
Oscillation frequency
Soft start time
VIN= 2.7V, VEN= 2.7V
1
VIN=5V , VEN=5V, (no load)
2
VIN=2.7V , VEN=2.7V,
(no load)
tss(2)
－
1.3
2.4
－
ms
VUV
－
－
－
2.2
2.5
0.1
2.7
V
V
Detection
Undervoltage
protection
Hysteresis
ΔVUV
－
－
－
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TB7102F
Electrical Characteristics Common to All Products
When a pulse test is carried out, Tj = 25°C is the standard condition in the measurements for each item.
Any drift in the electrical characteristic due to a rise in the junction temperature
of the chip may be disregarded.
Protection function (reference data)
－
－
－
160
20
－
－
oC
oC
－
TSD
Detection
Overheat
protection
Hysteresis
ΔTSD
－
Application Circuit Example
VIN
VIN
EN
VFB
Lx
TB7102F
SGND
L
VOUT
CIN
RFB1
RFB2
PGND
COUT
GND
GND
Figure 1: TB7102F application circuit example
Component constants
The following values are given only for your reference and may need tuning depending on your input/output
conditions and board layout.
CIN: Input smoothing capacitance of 10 μF
(multilayer ceramic capacitor JMK212BJ106KG, manufactured by Taiyo Yuden Co., Ltd.)
COUT: Output smoothing capacitance of 10 μF
(multilayer ceramic capacitor JMK212BJ106KG manufactured by Taiyo Yuden Co., Ltd.)
FB1: Output voltage setting resistance of 75 kΩ (@ VIN = 5 V, VOUT = 3.3 V)
FB2: Output voltage setting resistance of 24 kΩ (@ VIN = 5 V, VOUT = 3.3 V)
R
R
L: Inductor3.3 μH (@ VIN = 5 V, VOUT = 3.3 V); CDRH4D28C/LD series, manufactured by Sumida Corporation
How to use
Setting the Inductance
The required inductance can be calculated by using the following equation:
VIN −VOUT VOUT
fOSC ⋅ ΔIL VIN
L =
⋅
…
(1)
VIN: Input voltage (V)
fOSC: Oscillation frequency (Hz)
VOUT: Output voltage (V)
ΔIL: Inductor ripple current (A)
* Generally, ΔIL should be set to 30% to 40% of the maximum output current . For the TB7102F, set ΔIL to 0.3 A, as
its maximum current [ILX(MAX)] is 1 A (min). Therefore select an inductor whose current rating is no lower than the
peak switch current [1.15 A (min)] of the TB7102F. If the current rating is exceeded, the inductor becomes
saturated, leading to an unstable DC-DC converter operation.
If VIN = 5 V and VOUT = 3.3 V, the required inductance can be calculated as below. Be sure to select an inductor
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TB7102F
with an optimum constant by taking VIN variations into consideration.
VIN −VOUT VOUT
fOSC ⋅ ΔIL VIN
ΔIL
L =
⋅
5V − 3.3V
1MHz ⋅300mA 5V
= 3.7μH
3.3V
0
=
⋅
1
VOUT
VIN
T =
f
TON = T ⋅
OSC
Figure 2: Inductor current waveform
Setting the output voltage
For the TB7102F, the output voltage is set using the voltage dividing resistors RFB1 and RFB2 according to the
reference voltage [0.8 V (typ.)] of the error amplifier connected to the FB pin. The output voltage can be calculated by
using equation 2 below. If the RFB1 value is extremely large, a delay can occur due to parasitic capacitance at the FB pin.
Keep the RFB1 value at approximately 10 kΩ. Output voltage that can be set is from 0.8 V (typ.) to Input voltage -1V. It is
recommended that a resistor with a precision of ±1% or higher be used for setting the output voltage.
Table1 :Example of output voltage setting
R
FB1
FB2
V
OUT
= V
REF
⋅(1+
)
VOUT
RFB1
RFB2
R
Lx
Output Voltage
1.2V
R
R
FB2
FB1
R
R
FB1
= 0.8×(1+
)
…
(2)
1.2kΩ
2.4kΩ
FB2
FB
1.5V
2.1kΩ
3.0kΩ
5.1kΩ
7.5kΩ
2.4kΩ
2.4kΩ
2.4kΩ
2.4kΩ
1.8V
2.5V
3.3V
Figure 3: Output voltage setting resistors
Output capacitor
The capacitance of the output ceramic capacitor is greatly affected by temperature. Select a product whose
temperature characteristics (such as B-characteristic) are excellent. The capacity value should be adjusted to about
10μF(@Output Voltage 2.0V~4.5V), or about 22μF(@Output Voltage 1.2V~2.0V),and the capacitance set to an optimum
value that meets the set's ripple requirement. Ceramic capacitors can be used to achieve low output ripple. It is more
difficult to achieve phase compensation with ceramic capacitors because the equivalent series resistance (ESR) of the
former is lower. For this reason, perform a careful evaluation when using ceramic capacitors.
Precautions
• Please select parts after confirming the actual operation in the customer set and considering the input voltage the
output voltage, the output current, the temperature, the characteristics or the kind of capacitor, the inductor and
resistance .
• If the voltage between the input and output is low, the influence of the on-state voltage of the switch power
MOSFET is greater, causing the voltage across the inductor to decrease. For this reason, it may become
impossible for the required inductor current to flow, resulting in lower performance or unstable operation of the
DC-DC converter. As a rough standard, keep the input-output voltage potential difference at or above 1 V, taking
the on-state voltage of the power MOSFET into consideration.
• The lowest output voltage that can be set is 0.8 V (typ.).
• There is an antistatic diode between the ENB and VIN pins. The voltage between the ENB and VIN pins should
satisfy the rating VENB - VIN < 0.3 V
• If the operation becomes unstable due to the switching noise under a heavy load, please mount a by-pass capacitor
Ccc between the SGND pin and the VIN pin.
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TB7102F
Characteristic data
I
IN
– V
IN
I
IN
– T
a
800
600
800
700
600
500
400
200
0
400
300
V
V
V
= 2.7V
IN
V
= V
= V
EN FB
IN
= 2.7V
FB
EN
T = 25oC
a
= V
IN
0
2
4
6
-80
-40
0
40
80
120
160
Input voltage
V
a
(V )
Ambient temperature
T
(°C )
IN
a
I
IN
– T
V ,V – T
IH IL
a
900
800
700
3
2
1
V
IH
V
IL
600
500
400
V
V
V
= 5.5V
IN
= 5.5V
FB
EN
V
V
= 2.7V
IN
= V
IN
= 1.5V
OUT
0
-80
-40
0
40
80
120
160
-80
-40
0
40
80
120
160
Ambient temperature
T
a
(°C )
Ambient temperature
T
a
(°C )
V
,V – T
I – V
IH IN
IH IL
a
3.5
20
10
0
3
2.5
2
V
V
IH
IL
V
V
= 5V
V
= V
EN
IN
IN
= 3.3V
Ta = 25°C
OUT
1.5
0
2
4
6
8
-80
-40
0
40
80
120
160
Ambient temperature
T
a
(°C )
Input voltage
V
IN
(V )
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TB7102F
V
– T
I – T
IH
UV
a
a
2.6
20
16
12
8
Return
2.55
2.5
Detection
2.45
2.4
4
0
V
V
V
= 5V
IN
= 5V
EN
= 3.3V
OUT
-80
-40
0
40
80
120
160
-80
-40
0
40
80
120
160
Ambient temperature
T
a
(°C )
Ambient temperature
T
a
(°C )
V
OUT
– V
IN
V
FB
– V
IN
0.85
4
2
0.8
0
VIN = VEN
VIN = VEN
4
4
VOUT = 3.3V
Ta = 25°C
VOUT = 1.5V
Ta = 25°C
0.75
2.5
3
3.5
2
2
3
4
5
6
Input voltage
V
IN
(V )
Input voltage
V
IN
(V )
V
– T
a
V
– T
a
FB
FB
0.85
0.85
0.8
0.8
VIN = 2.7V
VEN = 2.7V
VOUT = 1.5V
VIN = 5V
VEN = 5V
VOUT = 3.3V
0.75
0.75
-80
-80
-40
0
40
80
100
160
-40
0
40
80
120
140
Ambient temperature
T
a
(°C )
Ambient temperature
T
a
(°C )
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TB7102F
f
– V
IN
f
– T
OSC
OSC
a
1200
1200
1100
1000
1100
1000
900
800
900
800
V
V
= V
V
V
V
= 5V
IN
EN
= 1.5V
IN
= 5V
OUT
EN
Ta = 25°C
= 3.3V
OUT
2
3
4
5
6
-80
-40
0
40
80
120
160
Input voltage
V
IN
(V )
Ambient temperature
T
a
(°C )
V
OUT
– I
OUT
V
OUT
– I
OUT
1.26
1.24
1.22
1.26
1.24
1.22
1.2
VIN=3.3 V
VIN= 5.0V
1.18
1.16
1.14
1.18
1.16
1.14
V
= 1.2V
OUT
L = 3.3 μH
= 22μF
V
= 1.2V
OUT
L = 3.3 μH
= 22μF
C
OUT
C
OUT
Ta = 25°C
Ta = 25°C
1
0.01
0.1
1
0.01
0.1
Load Current
I
(A)
Load Current
I
(A)
OUT
OUT
OUT
V
OUT
– I
V
– V
OUT IN
3.465
1.26
1.24
1.22
3.410
3.355
VIN=5.0 V
IOUT = 0.2A
1.2
3.3
1.18
1.16
3.245
V
= 3.3V
V
= 1.2V
OUT
OUT
L = 3.3 μH
= 10μF
L = 3.3 μH
3.190
3.135
C
C
= 22μF
OUT
OUT
Ta = 25°C
Ta =25°C
1.14
2
3
4
5
6
1
0.01
0.1
Input Voltage
V
IN
(V)
Load Current
I
(A)
OUT
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2007-06-20
TB7102F
V
– V
IN
η – I
OUT
OUT
3.465
100
80
60
40
20
0
3.410
3.355
VIN = 5.0V
IOUT = 0.2A
3.3
3.245
V
= 1.2V
OUT
L = 3.3 μH
= 22μF
V
= 3.3V
OUT
L = 3.3 μH
= 10μF
C
3.190
3.135
OUT
C
OUT
Ta = 25°C
Ta = 25°C
0
0.2
0.4
0.6
0.8
1
2
3
4
5
6
Load Current
I
(A)
OUT
Input Voltage
V
IN
(V)
η – I
OUT
η – I
OUT
100
80
100
80
VIN = 5.0V
VIN = 3.3V
60
40
20
0
60
40
V
= 3.3V
OUT
L = 3.3 μH
= 10μF
V
= 1.2V
OUT
L = 3.3 μH
= 22μF
20
0
C
OUT
C
OUT
Ta = 25°C
Ta = 25°C
0
0.2
0.4
0.6
0.8
1
0
0.2
0.4
0.6
0.8
1
Load Current
I
(A)
Load Current
I
(A)
OUT
OUT
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TB7102F
Package dimensions
SON8-P-0303-0.65A
Unit: mm
8
5
0.1 max
1
4
0.17
± 0.02
B
0.33
± 0.05
0.05 M
A
0.05 M
B
0.475
0.65
2.9
± 0.1
A
S
0.025
S
Weight: 0.017 g (Typ.)
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2007-06-20
TB7102F
RESTRICTIONS ON PRODUCT USE
20070701-EN
• The information contained herein is subject to change without notice.
• TOSHIBA is continually working to improve the quality and reliability of its products. Nevertheless, semiconductor
devices in general can malfunction or fail due to their inherent electrical sensitivity and vulnerability to physical
stress. It is the responsibility of the buyer, when utilizing TOSHIBA products, to comply with the standards of
safety in making a safe design for the entire system, and to avoid situations in which a malfunction or failure of
such TOSHIBA products could cause loss of human life, bodily injury or damage to property.
In developing your designs, please ensure that TOSHIBA products are used within specified operating ranges as
set forth in the most recent TOSHIBA products specifications. Also, please keep in mind the precautions and
conditions set forth in the “Handling Guide for Semiconductor Devices,” or “TOSHIBA Semiconductor Reliability
Handbook” etc.
• The TOSHIBA products listed in this document are intended for usage in general electronics applications
(computer, personal equipment, office equipment, measuring equipment, industrial robotics, domestic appliances,
etc.).These TOSHIBA products are neither intended nor warranted for usage in equipment that requires
extraordinarily high quality and/or reliability or a malfunction or failure of which may cause loss of human life or
bodily injury (“Unintended Usage”). Unintended Usage include atomic energy control instruments, airplane or
spaceship instruments, transportation instruments, traffic signal instruments, combustion control instruments,
medical instruments, all types of safety devices, etc.. Unintended Usage of TOSHIBA products listed in his
document shall be made at the customer’s own risk.
• The products described in this document shall not be used or embedded to any downstream products of which
manufacture, use and/or sale are prohibited under any applicable laws and regulations.
• Please contact your sales representative for product-by-product details in this document regarding RoHS
compatibility. Please use these products in this document in compliance with all applicable laws and regulations
that regulate the inclusion or use of controlled substances. Toshiba assumes no liability for damage or losses
occurring as a result of noncompliance with applicable laws and regulations.
13
2007-06-20
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TB7106F(TE12L,Q)
IC SWITCHING REGULATOR, 460 kHz SWITCHING FREQ-MAX, PDSO8, 5 X 5 MM, 1.27 MM PITCH, PLASTIC, HSON-8, Switching Regulator or Controller
TOSHIBA
TB7107FN(TE85L,F)
IC SWITCHING REGULATOR, 460 kHz SWITCHING FREQ-MAX, PDSO8, 3 X 3 MM, 0.65 MM PITCH, PLASTIC, SON-8, Switching Regulator or Controller
TOSHIBA
TB7109F(TE12L,Q)
IC SWITCHING REGULATOR, 480 kHz SWITCHING FREQ-MAX, PDSO8, 5 X 5 MM, 1.27 MM PITCH, PLASTIC, HSON-8, Switching Regulator or Controller
TOSHIBA
TB7110F(TE12L,Q)
IC SWITCHING REGULATOR, 600 kHz SWITCHING FREQ-MAX, PDSO8, 5 X 5 MM, 1.27 MM PITCH, PLASTIC, HSON-8, Switching Regulator or Controller
TOSHIBA
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