SM6702-33HB1 [SEIKO]
Switching Regulator/Controller,;
| 型号： | SM6702-33HB1 |
| 厂家： | 
SEIKO EPSON CORPORATION |
| 描述： | Switching Regulator/Controller, |
| 文件： | 总9页 (文件大小：113K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SM6702 series
PFM Step-up DC/DC Converter
OVERVIEW
The SM6702 series are step-up DC/DC converter ICs, fabricated using NPC’s Molybdenum-gate CMOS pro-
cess. They incorporate reference voltage source, error amplifier, oscillator, start-up circuit, PFM (Pulse Fre-
quency Modulation) control circuit into a single chip. The only external components required are a Coil, Diode
and output smoothing capacitors to form a step-up DC/DC converter. They employ PFM voltage control cir-
cuits to achieve high efficiency, stable constant-voltage output.
FEATURES
PINOUT
(Top view)
ꢀ Power dissipation: 24µW at V = 1.5V, V
=
IN
OUT
3.0V, I
= 100µA
OUT
ꢀ Start-up input voltage: 0.9V (max) at R = 30kΩ
L
ꢀ Output voltage: 2.2 to 3.3V, available in 0.1Vstep
ꢀ High efficiency: 85% at V = 1.5V, V = 3.0V,
IN
OUT
I
= 1mA
OUT
ꢀ Low ripple voltage
ꢀ Package: SOT89-3
APPLICATIONS
ꢀ PDA, Mobile IT equipment
ꢀ Digital Still Camera
ꢀ Pager
1
2
3
VSS
OUT
LX
ꢀ Constant-voltage sources for battery-operated
equipment
ꢀ Local voltage sources
PACKAGE DIMENSIONS
(Unit: mm)
ORDERING INFORMATION
1
Device
Output voltage
Package
SOT89-3
SOT89-3
SOT89-3
SM6702-33HB1
SM6702-30HB1
SM6702-27HB1
3.3V
3.0V
2.7V
4.5 0.1
1.5 0.1
1.60 0.2
0.15 0.15
1. Stepwise setting with a step of 0.1V in the range of 2.2V to 3.3V is
available.
+ 0.03
0.41 − 0.05
1.5
1.5
0.42 0.06
0.42 0.06
0.47 0.06
NIPPON PRECISION CIRCUITS INC.—1
SM6702 series
BLOCK DIAGRAM
OUT
LX
PFM OSC
START-UP
VREF
VSS
PIN DESCRIPTION
Number
Name
Description
1
2
3
VSS
OUT
LX
Ground
Output (device supply pin)
Switching pin
NIPPON PRECISION CIRCUITS INC.—2
SM6702 series
SPECIFICATIONS
Absolute Maximum Ratings
T = 25°C
a
Parameter
LX impressed voltage
OUT impressed voltage
LX output current
Symbol
Condition
Rating
Unit
V
V
5
4
LX
V
V
OUT
I
200
mA
mW
°C
°C
LX
Power dissipation
P
500
D
Operating temperature
Storage temperature
T
− 20 to 70
− 40 to 125
opr
T
stg
Electrical Characteristics
L = 330µH, C = 22µF, T = 25°C, V = 0V
a
SS
Rating
Parameter
Symbol
Condition
Unit
min
–
typ
–
max
0.9
0.7
16
Start-up voltage
V
R = 30kΩ
V
V
st
L
Holding voltage
V
R = 3kΩ
–
–
hold
L
Current consumption
I
V
= 1.5V, R = 30kΩ
–
8
µA
SS
IN
IN
L
V
×
V
×
target
1.025
target
0.975
Output voltage
V
V
= 1.5V, R = 3kΩ
V
V
OUT
L
target
2.2 ≤ V
2.8 ≤ V
≤ 2.7
≤ 3.3
60
–
–
–
target
target
V
V
= V
= 0.4V
− 0.1,
target
OUT
LX output current
I
mA
LX
LX
80
–
LX leakage current
I
V
V
V
= V = 3.5V
LX
–
–
1
µA
kHz
%
LXL
OUT
OUT
OUT
Maximum oscillator frequency
Switch ON duty cycle
f
= V
= V
− 0.1
− 0.1
80
100
75
120
85
OSC
target
target
Duty
65
V
+
target
0.2
Input voltage range
V
–
–
V
IN
V
: Setting output voltage
target
NIPPON PRECISION CIRCUITS INC.—3
SM6702 series
FUNCTIONAL DESCRIPTION
Step-up Principle
The SM6702 series use a transistor to switch the input supply in a non-isolated chopper switching regulator
configuration. The figure below shows the basic step-up switching regulator circuit.
If the transistor is ON for an interval t and then instantly turned OFF, the energy stored in the coil L during
ON
the interval t generates a voltage V across the coil. This voltage is superimposed on the input voltage such
ON
L
that the peak voltage reaches V + V which forces the diode D to conduct and release the stored energy into
IN
L
the output.
During normal operation, the above switching occurs repeatedly at a frequency controlled by an oscillator
(which can change depending on the input and output load conditions), generating a square wave output which
is then smoothed by the output capacitor C. Thus the output voltage (V
> V ) has been stepped up.
OUT
IN
L
D
VOUT
VIN
C
Tr
GND
PFM Control
In SM6702 series, the LX transistor ON interval is fixed, and the OFF interval varies in response to the input
voltage and load changes. Thus the resulting switching cycle frequency varies, called pulse frequency modula-
tion.
NIPPON PRECISION CIRCUITS INC.—4
SM6702 series
BASIC CIRCUIT
L
D
VIN
OUT
+
C
LX
OUT
VSS
Coil (L) : 330µH
Diode (D) : MA721 (Matsushita Schottky diode)
Capacitor (C ) : 22µF tantalum
L
TYPICAL APPLICATION CIRCUIT
L
D
3V System
Voltage
+
+
LX
OUT
C1
C2
C3
1.5V
VSS
Coil (L) : 330µH
Schottky Diode (D)
Capacitor (C1) : 22µF tantalum
Capacitor (C2) : 0.22µF ceramic
Capacitor (C3) : 22µF tantalum
NIPPON PRECISION CIRCUITS INC.—5
SM6702 series
BASIC CHARACTERISTICS (V : 3.0V)
out
Output voltage vs. Output current
L=470µH, C=22µF
L=330µH, C=22µF
3.5
3
3.5
3
V
in=1.5V
Vin=1.5V
V
in=0.9V
Vin=0.9V
2.5
2
2.5
2
Vin=1.2V
V
in=1.2V
1.5
1
1.5
1
0.5
0
0.5
0
0
5
10
15
20
25
30
0
5
10
15
20
25
30
Output Current Iout[mA]
Output Current Iout[mA]
Efficiency vs. Output current
L=470µH, C=22µF
L=330µH, C=22µF
100
100
95
90
85
80
75
70
65
60
55
50
95
90
85
80
Vin=0.9V
Vin=0.9V
V
in=1.5V
75
70
65
60
55
50
Vin=1.5V
V
in=1.2V
Vin=1.2V
0
5
10
15
20
25
30
0
5
10
15
20
25
30
Output Current Iout[mA]
Output Current Iout[mA]
Ripple voltage vs. Output current
L=330µH, C=22µF
200
175
150
125
Vin=1.5V
100
Vin=1.2V
75
50
25
0
Vin=0.9V
20
0
10
30
40
50
60
Output Current Iout[mA]
NIPPON PRECISION CIRCUITS INC.—6
SM6702 series
Output voltage vs.Temperature
Maximum oscillator frequency vs.
Temperature
Vin=1.5V, L=330µH, RL=3kΩ
Vout=2.9V
3.2
200
175
150
125
3.1
3.0
2.9
2.8
100
75
50
25
0
-40
-20
0
20
40
60
80
-40
-20
0
20
40
60
80
Temperature [°C]
Temperature [°C]
Start-up voltage vs.Temperature
Hold-on voltage vs.Temperature
L=330µH, RL=30kΩ
L=330µH, RL=3kΩ
1.0
1.0
0.8
0.6
0.4
0.2
0.0
0.8
0.6
0.4
0.2
0.0
-40
-20
0
20
40
60
80
-40
-20
0
20
40
60
80
Temperature [°C]
Temperature [°C]
Current consumption vs.Temperature
Oscillator duty cycle vs.Temperature
Vin=1.5V, L=330µH, RL=30kΩ
Vout=2.9V
10
90
85
80
75
70
65
60
55
50
8
6
4
2
0
-40
-20
0
20
40
60
80
-40
-20
0
20
40
60
80
Temperature [°C]
Temperature [°C]
NIPPON PRECISION CIRCUITS INC.—7
SM6702 series
LX switching current vs.Temperature
LX leakage current vs.Temperature
Vin=Vout=3.5V
Vout=2.9V
200
100
10
1
175
150
125
100
75
50
25
0
0.1
-40
-20
0
20
40
60
80
-40
-20
0
20
40
60
80
Temperature [°C]
Temperature [°C]
NIPPON PRECISION CIRCUITS INC.—8
SM6702 series
Please pay your attention to the following points at time of using the products shown in this document.
The products shown in this document (hereinafter “Products”) are not intended to be used for the apparatus that exerts harmful influence on
human lives due to the defects, failure or malfunction of the Products. Customers are requested to obtain prior written agreement for such
use from NIPPON PRECISION CIRCUITS INC. (hereinafter “NPC”). Customers shall be solely responsible for, and indemnify and hold NPC
free and harmless from, any and all claims, damages, losses, expenses or lawsuits, due to such use without such agreement. NPC reserves
the right to change the specifications of the Products in order to improve the characteristic or reliability thereof. NPC makes no claim or
warranty that the contents described in this document dose not infringe any intellectual property right or other similar right owned by third
parties. Therefore, NPC shall not be responsible for such problems, even if the use is in accordance with the descriptions provided in this
document. Any descriptions including applications, circuits, and the parameters of the Products in this document are for reference to use the
Products, and shall not be guaranteed free from defect, inapplicability to the design for the mass-production products without further testing
or modification. Customers are requested not to export or re-export, directly or indirectly, the Products to any country or any entity not in
compliance with or in violation of the national export administration laws, treaties, orders and regulations. Customers are requested
appropriately take steps to obtain required permissions or approvals from appropriate government agencies.
NIPPON PRECISION CIRCUITS INC.
4-3, Fukuzumi 2-chome, Koto-ku,
Tokyo 135-8430, Japan
Telephone: +81-3-3642-6661
Facsimile: +81-3-3642-6698
http://www.npc.co.jp/
Email: sales@npc.co.jp
NC9721EE 2003.01
NIPPON PRECISION CIRCUITS INC.—9
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