Rev.1.1
_00
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM CONTROL or
PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
S-8365/8366 Series
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.
Features
•
Low operation voltage
•
Input voltage range
•
Oscillation frequency
•
Reference voltage
•
Soft start function
•
Low current consumption
•
Duty ratio
: 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
•
Shutdown function
•
External parts
•
Timer latch short-circuit protection circuit
•
UVLO (under-voltage lockout) function
•
Small packages
•
Lead-free product
Applications
•
MP3 players, digital audio players
•
Digital cameras, GPS, wireless transceiver
•
Portable devices
Packages
Package name
SNT-6A
SOT-23-5
SOT-23-6
Drawing code
Package
PG006-A
MP005-A
MP006-A
Tape
PG006-A
MP005-A
MP006-A
Reel
PG006-A
MP005-A
MP006-A
Land
PG006-A
−
−
Seiko Instruments Inc.
1
Rev.1.1
_00
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
S-8365/8366 Series
3. Without UVLO and short-circuit protection
L
IC Internal
Power Supply
Triangular Wave
Oscillation Circuit
PWM Comparator
M1
EXT
PWM control, or
PWM / PFM
Switching Control
Circuit
+
−
Error
Amplifier
+
−
SD
V
OUT
VDD
C
FB
R
FB1
FB
R
FB2
V
IN
C
IN
ON/OFF
ON/OFF
Circuit
Reference Voltage
with Soft-Start Circuit
C
OUT
VSS
Figure 3
Caution
To stabilize the output voltage and oscillation frequency of the S-8365/8366 Series, the input voltage of
1.8 V
≤
V
DD
≤
5.5 V is necessary. When connecting the VOUT output to the VDD pin, set the input voltage
(V
OUT
) as to satisfy the above range, including the spike voltage generated in VOUT.
Seiko Instruments Inc.
3
S-8365/8366 Series
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.1.1
_00
Product Name Structure
Users can select the control system, oscillation frequency, short-circuit protection, UVLO function, packages for the
S-8365/8366 Series. Refer to “1.
Product Name”
regarding the contents of product name, “2.
Product List”
regarding
the product type.
1. Product name
(1) SNT-6A
S-836
x
A
x
x
x
x
-
I6T1
G2
Package name (abbreviation) and IC packing
specification
*1
I6T1: SNT-6A, Tape
ON / OFF pin pull-down
A: Unavailable
B: Available
UVLO function
A: Unavailable
B: Available
Short-circuit protection
A: Unavailable
B: Available
Oscillation frequency
A: 1.2 MHz
B: 600 kHz
Control system
5: PWM control
6: PWM / PFM switching control
*1.
Refer to the tape specification.
4
Seiko Instruments Inc.
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