R1212D Series
PWM Step-up DC/DC Controller
The R1212D Series are low supply current CMOS-based PWM step-up DC/DC controllers. R1212D does not include an internal output
transistor. By simply using a power MOS, an inductor, a diode, resistors, and capacitors as external components, a high-efficiency
step-up DC/DC converter can be easily configured. The oscillator maximum duty cycle and soft start time as well as phase
compensation can be set with external resistors and capacitor (The oscillator maximum duty cycle can be selected from the type
with/without internal limit.) The oscillator frequency can be selected from 300kHz, 700kHz, or 1.4MHz. The latch type protection circuit
embedded into the device latches the external driver in the "OFF" state when the oscillator maximum duty cycle continues for a
predetermined period of time setting by an external capacitor. R1212D also includes an under-voltage lockout circuit (UVLO).
FEATURES
•
Supply Current (I
DD1
)······················· Typ. 400μA (300kHz), Typ. 600μA (700kHz),
•
•
•
Typ. 900μA (1.4MHz) (V
IN
=5.5V, V
DLY
=V
FB
=0V,
EXT at no load)
Input Voltage Range (V
IN
) ·············· 2.2V to 5.5V
Output Voltage Range ···················· Externally adjustable (Feedback voltage : 1.0V)
Feedback Voltage Accuracy ···········± 1.5%
•
Temp. coeff. of Feedback Voltage·····
±
150ppm/°C
•
Oscillator Frequency (f
osc
)
∗
············· Select from 700kHz, 1.4MHz or 300kHz.
•
Oscillator Maximum Duty Cycle (Maxduty)
∗
···· Set with external resistors
•
UVLO Detect Voltage (V
UVLO
)
∗
············· Select from 1.9V, 2.1V or 2.8V.
•
Soft Start Time (t
start
) ·························· Set with an external resistor and
•
Package ········································· SON-8
capacitor
∗
) For information about combination of oscillator frequency, oscillator maximum duty cycle, and UVLO detect voltage, see SELECTION GUIDE.
BLOCK DIAGRAM
R1212D
Internal VR
TYPICAL APPLICATION
R1212D
L
SD
R3
C4
8
V
REFOUT
UVLO
V
IN
8 V
IN
C1
C2
4 DELAY
EXT 1
V
FB
5
NMOS
R1
C3
R2
OSC
DTC
3
PWM Comp
Latch
1
EXT
C6
2 GND AMPOUT 7
C5
6 V
REFOUT
R5
DTC 3
R6
C7
R4
V
REF
V
FB
5
Error Amp.
A
MPOUT 7
2
GND
4
D
ELAY
NMOS : CPH6415, L : VLP5612T, 10μH (A), 4.7μH (B), 22μH (C), SD : CRS02,
C1 : 2.2μF, C2 : 1μF, C3 : 15μF, C4=C5 : 1000pF (A), 680pF (B), 1500pF (C),
C6 : 0.1μF, C7 : 0.1μF, R3 : 1kΩ, R4 : 4.7kΩ, R5 : 240kΩ, R6 : 300kΩ
Output voltage set value 5V⋅⋅⋅R1 : 120kΩ, R2 : 30kΩ, 10V⋅⋅⋅R1 : 180kΩ, R2 : 20kΩ,
15V⋅⋅⋅R1 : 140kΩ, R2 : 10kΩ
SELECTION GUIDE
Halogen Free
-
Package
SON-8
Q'ty per Reel
3,000 pcs
Part No.
R1212D10.
∗
$ -TR-F
.0A.
.0B.
.1A.
.1C.
.2A.
.2C.
:
:
:
:
:
:
700kHz, No internal limit, 1.9V
1.4MHz, No internal limit, 1.9V
700kHz, Internal limiting Typ. 90%, 2.1V
300kHz, Internal limiting Typ. 91.5%, 2.1V
700kHz, Internal limiting Typ. 90%, 2.8V
300kHz, Internal limiting Typ. 91.5%, 2.8V
∗
$ : Specify a combination of the oscillator frequency, oscillator
maximum duty cycle internal limit, and UVLO detect voltage.
PACKAGE
SON-8
Top View
8
7
6
5
TYPICAL CHARACTERISTIC
R1212D100A Efficiency vs. Output Current
6
7
8
Bottom View
5
∗
1
2
3
4
4
3
2
1
1
2
3
4
EXT
GND
DTC
DELAY
5
6
7
8
V
FB
V
REFOUT
AMPOUT
V
IN
100
90
80
70
60
50
40
30
20
10
0
V
OUT
=5V
Efficiency
η
(%)
2.2V
3.3V
0
100
200
300
400
Output Current I
OUT
(mA)
500
∗)
The tab suspension leads are substrate level (GND).
APPLICATIONS
•
Power source for hand-held equipment
No.EK-109-111001
•
Power source for LCD and CCD
Step-up DC/DC Converter
LOAD
V
REFOUT
6
1. The products and the product specifications described in this document are subject to change or
discontinuation of production without notice for reasons such as improvement. Therefore, before
deciding to use the products, please refer to Ricoh sales representatives for the latest
information thereon.
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exporting or otherwise taking out of your country the products or the technical information
described herein.
4. The technical information described in this document shows typical characteristics of and
example application circuits for the products. The release of such information is not to be
construed as a warranty of or a grant of license under Ricoh's or any third party's intellectual
property rights or any other rights.
5. The products listed in this document are intended and designed for use as general electronic
components in standard applications (office equipment, telecommunication equipment,
measuring instruments, consumer electronic products, amusement equipment etc.). Those
customers intending to use a product in an application requiring extreme quality and reliability,
for example, in a highly specific application where the failure or misoperation of the product
could result in human injury or death (aircraft, spacevehicle, nuclear reactor control system,
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devices, life support system etc.) should first contact us.
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semiconductor products are likely to fail with certain probability. In order to prevent any injury to
persons or damages to property resulting from such failure, customers should be careful enough
to incorporate safety measures in their design, such as redundancy feature, firecontainment
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damage arising from misuse or inappropriate use of the products.
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concerning the products or the technical information.
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Electronic Devices Company
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