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PDF SM6702-27HA Data sheet ( Hoja de datos )
| Número de pieza | SM6702-27HA | |
| Descripción | PFM Step-up DC/DC Converter | |
| Fabricantes | Nippon Precision Circuits Inc | |
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Hay una vista previa y un enlace de descarga de SM6702-27HA (archivo pdf) en la parte inferior de esta página. Total 10 Páginas | ||
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NIPPON PRECISION CIRCUITS INC.
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
I Power dissipation : 24 µW at VIN = 1.5 V, VOUT = 3.0 V, IOUT = 100 µA
I Start-up input voltage : 0.9 V (max) at RL = 30 kΩ
I Output voltage : 2.2 V to 3.3 V, available in 0.1 Vstep
I High efficiency : 85% at VIN = 1.5 V, VOUT = 3.0 V, IOUT = 1 mA
I Low ripple voltage
I Package : SOT23-3, SOT89-3
APPLICATIONS
I PDA, Mobile IT equipment
I Digital Stil Camera
I Pager
I Constant-voltage sources for battery-operated equipment
I Local voltage sources
ORDERING INFORMATION
Device
Output voltage1
SM6702-33HB
3.3 V
SM6702-30HA
3.0 V
SM6702-30HB
3.0 V
SM6702-27HA
2.7 V
SM6702-27HB
2.7 V
SM6702-24HA
2.4 V
1. Stepwise setting with a step of 0.1V in the range of 2.2V to 3.3V is available.
Package
SOT89-3
SOT23-3
SOT89-3
SOT23-3
SOT89-3
SOT23-3
NIPPON PRECISION CIRCUITS—1
1 page  
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 tON and then instantly turned OFF, the energy stored in the coil L during
the interval tON generates a voltage VL across the coil. This voltage is superimposed on the input voltage such
that the peak voltage reaches VIN + VL which forces the diode D to conduct and release the stored energy into
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 (VOUT > VIN) has been stepped up.
L
VIN
D
VOUT
Tr C
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—5
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| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet SM6702-27HA.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| SM6702-27HA | PFM Step-up DC/DC Converter | Nippon Precision Circuits Inc |
| SM6702-27HB | PFM Step-up DC/DC Converter | Nippon Precision Circuits Inc |
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