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Número de pieza | S-8327 | |
Descripción | (S-8323 / S-8327) SMALL PACKAGE PWM CONTROL STEP-UP SWITCHING REGULATOR | |
Fabricantes | Seiko | |
Logotipo | ||
Hay una vista previa y un enlace de descarga de S-8327 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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Contents
Features .............................................................. 1
Applications ......................................................... 1
Block Diagram ..................................................... 1
Selection Guide ................................................... 2
Pin Assignment ................................................... 3
Absolute Maximum Ratings ................................. 3
Electrical Characteristics ..................................... 4
Test Circuits ........................................................ 9
Operation............................................................. 10
External parts selection for DC-DC converter ...... 13
Standard Circuits ................................................. 17
Precautions ......................................................... 19
Application Circuits .............................................. 20
Dimensions.......................................................... 25
Markings.............................................................. 25
Taping ................................................................ 26
Temperature Characteristics .............................. 29
Voltage Characteristics ....................................... 31
Ripple Characteristics ......................................... 32
Transient Responses .......................................... 33
Operation Start Voltage and Operation Holding
Voltage Characteristics for Output Current ......... 35
Input Voltage Characteristics for Input Current ... 35
Reference Data .................................................. 36
Frequently Asked Questions .............................. 45
1 page www.DataSheet4U.net
SMALL PACKAGE PWM CONTROL STEP-UP SWITCHING REGULATOR
S-8323/8327 Series
Electrical Characteristics
1-1.S-8323AXXMC
Parameter
Symbol
Conditions
Output voltage
Input voltage
Operation start voltage
Oscillation start voltage
Operation holding voltage
Current consumption 1
Current consumption 2
Current consumption during
shutdown
Switching current
Switchin transistor leak
current
Line regulation
Load regulation
Output voltage
temperature
coefficient
Oscillation frequency
Max. duty ratio
Shutdown pin
Input voltage
(ON/OFF type)
Soft start time
Efficiency
VOUT
VIN
VST1
VST2
VHLD
ISS1
ISS2
ISSS
ISW
ISWQ
∆VOUT1
∆VOUT2
∆VOUT/∆Ta
fosc
MaxDuty
VSH
VSL1
VSL2
TSS
EFFI
S-8323A52MC
S-8323A50MC
S-8323A33MC
S-8323A30MC
S-8323A27MC
S-8323A25MC
IOUT=1mA
No external parts, voltage applied to VOUT
CONT pulled up to 5 V by 10kΩ
IOUT=1mA, Measured by decreasing VIN voltage
graduelly
S-8323A52MC
S-8323A50MC
VOUT=output voltage×0.95
S-8323A33MC
S-8323A30MC
S-8323A27MC
S-8323A25MC
S-8323A52MC
S-8323A50MC
VOUT=output voltage+0.5
S-8323A33MC
S-8323A30MC
S-8323A27MC
S-8323A25MC
shutdown pin=0V
VCONT=0.4V
VOUT= VCONT=10V
S-8323A52MC
S-8323A50MC
S-8323A33MC
S-8323A30MC
S-8323A27MC
S-8323A25MC
VIN=output voltage×0.4 to ×0.6
IOUT=10µA to IOUT(below) ×1.25
S-8323A52MC
S-8323A50MC
Ta=-40°C to +85°C
S-8323A33MC
S-8323A30MC
S-8323A27MC
S-8323A25MC
VOUT=output voltage×0.95
Measured waveform at CONT pin
VOUT=output voltage×0.95
Measured waveform at CONT pin
VOUT=output voltage×0.95
Measured the oscillation at CONT pin
VOUT=output voltage×0.95
When
VOUT≥1.5V
Judged the stop of oscillation When
at CONT pin
VOUT<1.5V
S-8323A52MC
S-8323A50MC
S-8323A33MC
S-8323A30MC
S-8323A27MC
S-8323A25MC
(Unless otherwise specified: Ta=25°C)
Min. Typ. Max. Unit Test circuit
4.075
4.880
3.221
2.928
2.635
2.440
—
—
—
5.200
5.000
3.300
3.000
2.700
2.500
—
—
—
5.325
5.120
3.379
3.072
2.765
2.560
9
0.9
0.8
V
1
2
0.7 — —
1
— 31.6 52.6
— 30.2 50.3
— 19.1 31.8
— 17.2 28.7
— 15.5 25.9
— 14.3 23.9
—
3.5 6.9
µA
— 3.5 6.9
— 3.3 6.5
— 3.2 6.4
— 3.2 6.4
— 3.2 6.3
— — 0.5
2
114 182 —
114 182 —
78 125 — mA
78 125 —
61 98 —
61 98 —
— — 1.0 µA
—
—
— 30 60 mV
— 30 60
—
±0.26
—
—
±0.25
—
—
±0.17
— mV/°C
—
±0.15
—
—
±0.14
—
—
±0.13
—
42.5 50 57.5 kHz
1
75 83 90 %
0.75 — —
2
— — 0.3 V
— — 0.2
3.0 6.0 12.0 ms
— 87 —
— 87 —
— 83 — %
— 83 —
— 79 —
— 79 —
—
1
External parts used:
- Coil:
CD54 (100µH) of Sumida Electric Co., Ltd.
- Diode: MA720 (Schottky type) of Matsushita Electronic Components Co., Ltd.
- Capacitor: F93 (16V, 22µF, tantalum type) of Nichicon Corporation)
Applied VIN=output voltage×0.6, applied, IOUT=output voltage/250Ω
The shutdown pin is connected to VOUT pin.
Note 1: The output voltage specified above is the typical value.
4 Seiko Instruments Inc.
5 Page www.DataSheet4U.net
SMALL PACKAGE PWM CONTROL STEP-UP SWITCHING REGULATOR
S-8323/8327 Series
Operation
1. Step-Up DC/DC Converter
The S-8323/8327 Series is a step-up switching regulator using a pulse width modulation method (PWM) and DC/DC
converter and features a low current consumption.
In conventional PFM DC/DC converters, pulses are skipped at low output load current, causing fluctuation in ripple frequency
of the output voltage, with the result of increase in ripple voltage.
The S-8323/8327 series operates with the PWM control which changes the pulse width duty from 0% to 83% according to the
load current.
The ripple voltage generated from switching can be removed easily through the filter because the switching frequency is
constant.
The built-in soft start circuit controls a rush current and overshoot of the output voltage when powering on or the ON/OFF
terminal turns to “H” level.
Shutdown pin: Stops or starts step-up operation.
(Only for SOT-23-5 package products of A and B Series.)
Turning the shutdown pin low stops operation of all the internal circuits and reduces current consumption
significantly. DO NOT use the shutdown pin in floating state because it has a structure shown in Figure 4
and is not pulled up or pulled down internally. DO NOT apply voltage of between 0.3 V and 0.75 V to the
shutdown pin because applying such voltage increases the current consumption. If the shutdown pin is not
used, connect it to VOUT pin.
The shutdown pin doesn’t have hysteresis.
Shutdown pin
“H”
“L”
CR oscillation
circuit
Operation
Stop
Output
voltage
Fixed
~VIN*
* Voltage obtained by extracting the voltage drop
due to DC resistance of the inductor and the diode
forward voltage from VIN.
L
VIN
ON/OFF
Di
CONT
VOUT
ON/OFF
VOUT
Figure 4
VSS
+
- COUT
OSC
M1
+
-
Figure 5
10 Seiko Instruments Inc.
11 Page |
Páginas | Total 30 Páginas | |
PDF Descargar | [ Datasheet S-8327.PDF ] |
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