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Número de pieza | S-8365 | |
Descripción | (S-8365 / S-8366) 1.2 MHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER | |
Fabricantes | Seiko | |
Logotipo | ||
Hay una vista previa y un enlace de descarga de S-8365 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM CONTROL or
PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
S-8365/8366 Series
Features
The S-8365/8366 Series is a CMOS step-up switching regulator controller which
mainly consists of a reference voltage source, an oscillation circuit, an error
amplifier, a phase compensation circuit, a timer latch short-circuit protection
circuit, a PWM control circuit (S-8365 Series) and a PWM / PFM switching control
circuit (S-8366 Series).
With an external low-ON-resistance Nch Power MOS, this product is ideal for
applications requiring high efficiency and a high output current.
The S-8365 Series efficiently works on voltage’s condition of large I/O difference
due to the PWM control circuit linearly varies the duty ratio to 90%.
During light-load, the S-8366 Series switches its operation to the PFM control by
the PWM / PFM switching control circuit in order to prevent efficiency decline due
to the IC operating current.
Ceramic capacitors can be used for output capacitor. Small packages SNT-6A,
SOT-23-5 and SOT-23-6 enable high-density mounting.
• Low operation voltage
• Input voltage range
• Oscillation frequency
• Reference voltage
• Soft start function
• Low current consumption
• Duty ratio
• Shutdown function
• External parts
• Timer latch short-circuit protection circuit
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• UVLO (under-voltage lockout) function
• Small packages
• Lead-free product
: Start at 1.1 V (1 mA) guaranteed (in the product without UVLO function)
: 1.8 V to 5.5 V
: 1.2 MHz, 600 kHz
: 0.6 V±2.0%
: 7 ms typ.
: 70 µA typ. at switching off
: Built-in PWM / PFM switching control circuit (S-8366 Series)
28% to 85% (1.2 MHz product)
28% to 90% (600 kHz product)
: Current consumption 1.0 µA max. at shutdown
: Inductor, diode, capacitor, transistor
: Selectable with / without short-circuit protection circuit for each product
Settable delay time by external capacitor
(in the product with short-circuit protection)
: Selectable with / without UVLO for each product
: SNT-6A, SOT-23-5, SOT-23-6
Applications
• MP3 players, digital audio players
• Digital cameras, GPS, wireless transceiver
• Portable devices
Packages
Package name
SNT-6A
SOT-23-5
SOT-23-6
Package
PG006-A
MP005-A
MP006-A
Drawing code
Tape
Reel
PG006-A
PG006-A
MP005-A
MP005-A
MP006-A
MP006-A
Land
PG006-A
−
−
Seiko Instruments Inc.
1
1 page STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.1.1_00
S-8365/8366 Series
(2) SOT-23-5, SOT-23-6
S-836 x A x x x
*1. Refer to the tape specification.
www.DataSheet4U.com
x - xxxx S2
Package name (abbreviation) and IC packing
specification*1
M5T1: SOT-23-5, Tape
M6T1: SOT-23-6, Tape
ON / OFF pin pull-down
A: Unavailable
B: Available
UVLO function
A: Unavailable
B: Available
Short-circuit protection
A: Unavailable (SOT-23-5)
B: Available (SOT-23-6)
Oscillation frequency
A: 1.2 MHz
B: 600 kHz
Control system
5: PWM control
6: PWM / PFM switching control
Seiko Instruments Inc.
5
5 Page STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.1.1_00
S-8365/8366 Series
2. 600 kHz product
Table 9 Electrical Characteristics
(VDD = 3.3 V, Ta = 25°C unless otherwise specified)
Item Symbol
Conditions
Min. Typ. Max.
Unit
Test
Circuit
Input voltage*1
VDD
−
1.8 − 5.5 V
2
Operating start
voltage*2
Oscillation start
voltage
VST1
VST2
Product without UVLO function,
IOUT = 1 mA
No external parts
for product without UVLO function,
− − 1.0 V
− − 0.9 V
3
1
Operation holding
voltage
VHLD
FB voltage
VFB
FB voltage temperature ∆VFB
coefficient
∆Ta
Product without UVLO function,
IOUT = 1 mA, Determined by decreasing 0.8
VDD gradually
0.588
Ta = −40°C to +85°C
−
−
0.6
±100
−V
0.612 V
− ppm/°C
3
1
1
FB pin input current
Current consumption
at operation*3
IFB
ISS1
VDD = 1.8 V to 5.5 V, FB pin
At switching operation, no load
VFB = VFB(S) × 0.95
−0.1 −
− 300
0.1
−
µA
µA
1
1
Current consumption
at switching off
ISS2
At switching stop, VFB = VFB(S) × 1.5
− 70 120 µA
1
Current consumption
at shutdown
ISSS
VON / OFF = 0 V
− − 1.0 µA
1
EXT pin output current
IEXTH
IEXTL
VEXT = VDD − 0.4 V
VEXT = 0.4 V
− −130 −60
100 200
−
mA
mA
1
1
Oscillation frequency fosc
−
510 600 690 kHz
1
Maximum duty ratio
Max
Duty
VFB = VFB(S) × 0.95
85 90 95
%
1
PWM / PFM switching PFM
Duty ratio*4
Duty
VDD = VOUT(S) − 0.1 V, no load
20 28 36
%
2
Short-circuit protection
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tPRO
Product with short-circuit protection,
At CSP = 0.1 µF
37.5 50 75 ms
1
UVLO release voltage
UVLO hysteresis width
High level input voltage
Low level input voltage
High level input current
VUVLO+
VUVLOHYS
VSH
VSL
ISH
Product with UVLO function
Product with UVLO function
VDD = 1.8 V to 5.5 V, ON/OFF pin
VDD = 1.8 V to 5.5 V, ON/OFF pin
Product without ON/OFF pin pull-down,
VDD = 1.8 V to 5.5 V, ON/OFF pin
Product with ON/OFF pin pull-down,
VDD = 1.8 V to 5.5 V, ON/OFF pin
1.60
0.05
0.75
−
−0.1
0.2
1.70
0.10
−
−
−
1.0
1.78
0.15
−
0.3
0.1
2.5
V
V
V
V
µA
µA
1
1
1
1
1
1
Low level input current ISL
VDD = 1.8 V to 5.5 V, ON/OFF pin
−0.1 −
0.1 µA
1
Soft-start time
tSS
−
5 7 10 ms
2
*1. The S-8365/8366 Series steps up from VDD = 1.0 V, but set the input voltage as to 1.8 V ≤ VDD ≤ 5.5 V for stabilizing
the output voltage and oscillation frequency.
*2. This is the guaranteed value measured with external parts shown in “Table 10 External Parts List” and with test
circuits shown in Figure 10. The operating start voltage varies largely depending on diode’s forward voltage.
Evaluate sufficiently with actual device.
*3. VFB(S) is a setting value for FB voltage.
*4. VOUT(S) is a setting value for output voltage. VOUT is the typical value of actual output voltage.
VOUT(S) can be set by using the rate of VFB and the output voltage setting resistors (RFB1, RFB2).
*5. The short-circuit protection time can be set by the external capacitor, and the maximum set value by the external
capacitor is unlimited when an ideal case is assumed. But use CSP = approximately 0.47 µF as a target maximum
value due to the need to consider the discharge time of the capacitor.
Seiko Instruments Inc.
11
11 Page |
Páginas | Total 30 Páginas | |
PDF Descargar | [ Datasheet S-8365.PDF ] |
Número de pieza | Descripción | Fabricantes |
S-8365 | (S-8365 / S-8366) 1.2 MHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER | Seiko |
S-8366 | (S-8365 / S-8366) 1.2 MHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER | Seiko |
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