R1211x Series
PWM Step-up DC/DC Controller
No.EK-088-101001 Step-up DC/DC Converter
The R1211x Series are low suppl y current CMOS-b ased PWM step-u p DC/D C contr ollers. R12 11x does not include an in ternal outp ut
transistor. By simply using a power MOS, an inductor, a diode, resistors, and ca pacitors as external components, a high-efficiency
step-up DC/DC converter can be easily configured. R1211x is available in two versions: B/D versions with an internal phase
compensation and A/C versions with adjustable phase compensation with an external capacitor and resistor. The oscillator
frequency can be selected from 300kHz or 700kHz. The soft start function built into the controller is set to Typ. 10.5ms for 300kHz and
to Typ. 9ms for 700kHz. 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 setti ng by an external capacitor.
FEATURES
• Supply Current (IDD1)·······················Typ. 600μA (700kHz, VFB=0V, EXT at no load),
Typ. 300μA (300kHz, VFB=0V, EXT at no load)
• Standby Current (Istandby) ·················Max. 1μA (In standby, only B/D Versions)
• Input Voltage Range (VIN)···············2.5V to 6.0V
• Output Voltage Range····················Externally adjustable (Feedback voltage : 1.0V)
• Feedback Voltage Accuracy···········± 1.5%
•
Temp. coeff. of Feedback Voltage
·····± 150ppm/°C
• Oscillator Frequency (fosc)···············300kHz (C/D Versions)
700kHz (A/B Versions)
•
Oscillator Maximum Duty Cycle (Maxduty)
··Typ. 90%
• UVLO Detect Voltage (VUVLO) ·········2.2V
• Soft Start Time (tstart)·······················Typ. 10.5ms (300kHz)
Typ. 9ms (700kHz)
• Packages········································SON-6, SOT-23-6W
BLOCK DIAGRAMS
R1211x002A/C R1211x002B/D
(External phase compensation type) (Internal phase compensation type)
V
FB
A
MPOUT
EXT
V
IN
GND
DELAY
OSC
Latch
+
-+
-
-
-
+
-
+
-
Vref
DTC
UVLO
VFB
CE
EXT
VIN
GND
DELAY
OSC
UVLO
Latch
+
-+
-
-
-
+
-
+
-
Chip
Enable
Vref
DTC
SELECTION GUIDES TYPICAL APPLICATIONS
Halogen Free
Package
Q'ty per Reel
Part No.
SON-6
3,000 pcs
R1211D002
.
$
-TR-FE
SOT-23-6W 3,000 pcs
R1211N002
.
$
-TR-FE
R1211x002A/C
V
IN
DELAY
GND
EXT
V
FB
AMPOUT
R3
C4
C3
R1
R2
VOUT
NMOS
C1
C2
C5 R4
SD
LOAD
R1211x002B/D
V
IN
DELAY
GND
EXT
V
FB
CE
R3
C4 C3
R1
R2
V
OUT
NMOS
C1
C2
CE Control
SD
LOAD
.
$
.
:
Select from (
.
A
.
) oscillator frequency of 700kHz, external phase
compensation,
(
.
B
.
) oscillator frequency of 700kHz, internal phase compensation
with standby function,
(
.
C
.
) oscillator frequency of 300kHz, external phase compensation
or (
.
D
.
) oscillator frequency of 300kHz, internal phase
compensation with standby function.
NMOS : IRF7601, L : 10
μ
H (002A), 22
μ
H (002C),
SD : CRS02 , C 1 : 4 .7
μ
F, C2 : 0.22
μ
F, C3 : 10
μ
F,
C4 :680pF, C5 : 2200pF,
R3 : 30k
Ω
, R4 : 30k
Ω
NMOS : IRF7601, L : 10
μ
H (002B),
22
μ
H (002D), SD : CRS02, C1 : 4.7
μ
F,
C2 : 0.22
μ
F, C3 : 10
μ
F, C4 : 680pF, R3 : 30k
Ω
PACKAGES (Top View) TYPICAL CHARACTERISTIC
SON-6 SOT-23-6W
6 5 4
1 2 3
∗
1 3
6 4
2
5
1 DELAY
2 GND
3 EXT
4 VIN
5 VFB
6 AMPOUT or CE
1 DELAY
2 AMPOUT or CE
3 VFB
4 VIN
5 GND
6 EXT
R1211x002A Efficiency vs. Output Current
∗) The tab suspension leads on back side are substrate level (GND).
APPLICATIONS
• Power source for hand-held equipment • Power source for LCD and CCD • Power source for automotive application
0
20
40
100
60
80
1 10 100 1000
L=10μH, V
OUT
=5V
V
IN
=2.5V
V
IN
=3.3V
Output Current I
OUT
(mA)
Efficiency
η (%)
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