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PWM Step-up DC/DC Converter
R1210Nxx1x Series
APPLICATION MANUAL
NO. EA-075-0012
PWM Step-up DC/DC Converter
R1210Nxx1x Series
OUTLINE
The R1210Nxx1x Series are PWM step-up DC/DC Converter, with high accuracy, low supply current by CMOS process. Each of the R1210Nxx1x Series consists of an oscillator, a PWM circuit, a reference voltage unit, an error amplifier, phase compensation circuit, resistors for voltage detection, a chip enable circuit. Further, includes a controller against drastic load transient, a control transistor with low ON-Resistance, `LX switch', and a protection circuit for LX switch and an output voltage detector. R1210Nxx1A Series contain further a circuit for changeover oscillator frequency each. A low ripple, high efficiency step-up DC/DC converter can be composed of this IC with only three external components, or an inductor, a diode and a capacitor. The R1210N Series can detect drastic change of output voltage with a circuit controller. The load transient response is improved compared with current model, furthermore the R1210Nxx1A Series have another function, that is, when the load current is small, oscillator frequency is decreased by a circuit for switching oscillator frequency from TYP 100kHz to 35kHz, therefore, supply current is reduced. . The built-in chip enable circuit can make the standby mode with ultra low quiescent current. Since the package for these ICs is small SOT-23-5, high density mounting of the ICs on board is possible.
FEATURES
* External Components ................................................................. Only an inductor, a diode, and a capacitor * Standby Current ......................................................................... TYP 0A . * Low Temperature-Drift Coefficient of Output Voltage.............. TYP 100ppm/C . * Output Voltage............................................................................. Stepwise Setting with a step of 0.1V in the range of 2.2V to 6.0V (xx1C/D) 2.2V to 3.5V (xx1A) * Two choices of Basic Oscillator Frequency................................ 100kHz (xx1A/C), 180kHz (xx1D) * Small Package .............................................................................. SOT-23-5 (Mini-mold) * High Efficiency ............................................................................ TYP 88% . (VIN=Set Output Voltagex0.6 [V], IOUT=10mA) * Low Ripple, Low Noise * Built-in a driver transistor with low on-resistance * Start-up Voltage........................................................................... MAX. 0.9V * Basic Frequency change-over circuit (only for xx1A type)....... from TYP. 100kHz to 35kHz
1
R1210Nxx1x
APPLICATIONS
* Power source for battery-powered equipment. * Power source for portable communication appliances, cameras, VCRs * Power source for appliances of which require higher voltage than battery voltage.
BLOCK DIAGRAM
Vref Circuit LX 5 VLX limiter Buffer PWM Controller OSC fosc Control Phase Comp. 2 VOUT
4 GND Chip Enable 1 CE
SELECTION GUIDE
In the R1210N Series, the output voltage, the oscillator frequency, the optional function, and the taping type for the ICs can be selected at the user's request. The selection can be made by designating the part number as shown below ; R1210Nxx1x-xx a bc Code Setting Output Voltage (VOUT) : a Stepwise setting with a step of 0.1V in the range of 2.2V to 6.0V (for xx1C/D version) or 2.2V to 3.5V (for xx1A version) is possible. Designation of Oscillator Frequency b A : 100kHz with a Frequency Change-over circuit C : 100kHz without a Frequency Change-over circuit D : 180kHz without a Frequency Change-over circuit c Designation of Taping Type; Ex. :TR, TL (refer to Taping Specification) "TR" is prescribed as a standard. Contents
2
R1210Nxx1x
PIN CONFIGURATION
SOT-23-5
5 4
LX CE
GND (mark side) VOUT NC
1
2
3
PIN DESCRIPTION
Pin No. 1 2 3 4 5 CE VOUT NC GND LX Symbol Description Chip Enable Pin Pin for Monitoring Output Voltage No Connection Ground Pin Switching Pin (Nch Open Drain)
ABSOLUTE MAXIMUM RATINGS
Symbol VOUT VLX VCE ILX PD Topt Tstg Item VOUT Pin Output Voltage LX Pin Output Voltage CE Pin Input Voltage LX Pin Output Current Power Dissipation Operating Temperature Range Storage Temperature Range Rating 9.0 9.0 9.0 400 250 -40+85 -55+125 Unit V V V mA mW C C
3
R1210Nxx1x
ELECTRICAL CHARACTERISTICS
* R1210Nxx x xx1x xx Symbol VOUT VIN VOUT/ Topt Vstart Vstart/ Topt Vhold Item Output Voltage Maximum Input Voltage Step-up Output Voltage Temperature Coefficient Start-up Voltage Start-up Voltage Temperature Coefficient -40C Topt 85C VIN=0V2V VOUT:1.8k pull-down -40C Topt 85C 0.7 0.9 30 50 35 60 40 70 45 80 50 90 55 80 60 90 70 100 80 110 90 120 -3.2 100 0.9 Conditions VIN=VSETx0.6, IOUT=1mA MIN. x0.975 TYP. MAX. x1.025 8 (Topt=25C) Unit V V ppm/C V mV/C V (xx1A/C) V (xx1D) A (xx1A/C) A (xx1D) A (xx1A/C) A (xx1D) A (xx1A/C) A (xx1D) A (xx1C) A (xx1D) A (xx1C) A (xx1D)
Hold-on Voltage
VIN=2V0V IOUT=1mA ,
2.2VVSET2.5V VOUT=VSETx0.96
2.6VVSET3.0V VOUT=VSETx0.96
IDD1
Supply Current1
3.1VVSET3.5V VOUT=VSETx0.96
3.6VVSET4.0V VOUT=VSETx0.96
4.1VVSET4.5V VOUT=VSETx0.96
4
R1210Nxx1x
Symbol
Item
Conditions
MIN.
TYP. 70 100 80 110 90 130 10
MAX. 100 130 110 150 120 170 17 24 0.5 0.5
Unit A (xx1C) A (xx1D) A (xx1C) A (xx1D) A (xx1C) A (xx1D) A (xx1A/C) A (xx1D) A A KHz (xx1A/C) KHz (xx1D) kHz/C (xx1A/C) kHz/C (xx1D)
4.6VVSET5.0V VOUT=VSETx0.96
IDD1
Supply Current1
5.1VVSET5.5V VOUT=VSETx0.96
5.6VVSET6.0V VOUT=VSETx0.96
IDD2
Supply Current2
VOUT=VCE=VSET+0.5V 15
Istandby ILXleak
Standby Current LX Leakage Current
VOUT=6V VCE=0V , VOUT=VLX=8V 80 VOUT=VCE=VSETx0.96 144 180 0.5 -40C Topt 85C 0.6 VOUT=VCE=VSETx0.96, (VLX "L" Side) VOUT=VCE=VSETx0.96, (VLX "L" Side) VOUT=VSETx0.96 VOUT=VSETx0.96 VOUT=VCE=6.5V VIN=6.5V VCE=0V , -0.1 -0.1 0 0 70 0.4 0.9 85 0.6 100
fosc
Maximum Oscillator Frequency
120 216
fosc/ Topt
Oscillator Frequency Temperature Coefficient
Maxdty VLXlim VCEH VCEL ICEH ICEL
Oscillator Maximum Duty Cycle VLX Limit Voltage CE "H" Input Voltage CE "L Input Voltage " CE "H" Input Current CE "L Input Current "
97 0.8
% V V
0.3 0.1 0.1
V A A
5
R1210Nxx1x
Symbol
Item
Conditions 2.2VVSET2.4V VLX=0.4V 2.5VVSET2.9V VLX=0.4V 3.0VVSET3.4V VLX=0.4V 3.5VVSET3.9V VLX=0.4V 4.0VVSET4.4V VLX=0.4V 4.5VVSET4.9V VLX=0.4V 5.0VVSET5.4V VLX=0.4V 5.5VVSET6.0V VLX=0.4V VIN=VSETx0.6, IOUT=0.5mA (only for xx1A)
MIN. 70 85 100 120 140 150 170 190 10
TYP.
MAX.
Unit mA mA mA mA mA mA mA mA
ILX
LX Switching Current
fosc2
Change-over frequency
35
70
KHz
*Note: VSET means setting Output Voltage.
6
R1210Nxx1x
TEST CIRCUITS
A
L LX VIN GND CE
OSCILLOSCOPE
SD
E
LX VOUT CL GND CE
VOUT
CL
V
B
LX
VOUT A
F
LX
VOUT CL
GND
CE
GND
CE
OSCILLOSCOPE
C
LX
VOUT A
G
LX VOUT
GND
CE
GND CE
OSCILLOSCOPE
D
A
LX
VOUT
H
LX
VOUT
GND
CE
GND
CE
A
L: 100H CD54 (Sumida Electric Co, LTD) SD: MA721 (Matsushita Electronics Corporation, Schottky Type) CL: 22Fx2 (Tantalum Type)
7
R1210Nxx1x
TYPICAL CHARACTERISTICS
1) Output Voltage vs. Output Current R1210N301C
3.2 VIN:0.9V
3.2 VIN:0.9V
R1210N301D
Output Voltage VOUT (V)
Output Voltage VOUT (V)
3.1 VIN:1.5V
VIN:2.0V VIN:2.5V
3.1 VIN:1.5V
VIN:2.0V VIN:2.5V
3.0
3.0
2.9
2.9
2.8 0 50 100 150 200 250 Output Current IOUT (mA) 300
2.8 0 50 100 150 200 250 Output Current IOUT (mA) 300
R1210N501C
5.4 VIN:3.0V VIN:2.0V VIN:4.0V
R1210N501D
5.4
Output Voltage VOUT (V)
Output Voltage VOUT (V)
5.2
5.2
VIN:3.0V VIN:4.0V
5.0
5.0
4.8 VIN:1.5V 4.6 4.4 0 50 100 150 200 250 Output Current IOUT (mA) 300
4.8 VIN:2.0V 4.6 VIN:1.5V 4.4 0 50 100 150 200 250 Output Current IOUT (mA) 300
2)
Efficiency vs. Output Current R1210N301C
100
100
R1210N301D
80 VIN:2.5V
efficiency (%)
80 VIN:2.5V
efficiency (%)
60 VIN:1.5V 40 VIN:0.9V 20 0 0 50
VIN:2.0V
60 VIN:1.5V 40 VIN:0.9V 20 0
VIN:2.0V
100 150 200 250 Output Current IOUT (mA)
300
0
50
100 150 200 250 Output Current IOUT (mA)
300
8
R1210Nxx1x
R1210N501C
100
100
R1210N501D
80
VIN:4.0V
80 VIN:4.0V
efficiency (%)
60 VIN:1.5V
efficiency (%)
VIN:3.0V VIN:2.0V
VIN:3.0V 60 VIN:2.0V VIN:1.5V 40
40
20 0 0 50 100 150 200 250 Output Current IOUT (mA) 300
20 0 0 50 100 150 200 250 Output Current IOUT (mA) 300
3)
R1210Nxx1A/C Efficiency R1210N301x x
VIN:1.5V 100 90 80 70
efficiency (%)
60 50 40 30 20 10 0 0.01 0.10 1.00 10.00 Output Current IOUT(mA) 100.00 R1210N301A R1210N301C
4)
Ripple Voltage vs. Output Current R1210N301C
ESR:0.33 140
R1210N301D
ESR:0.33 140
Ripple Voltage Vripple (mV)
100 VIN:1.5(V) 80 60 40 20 0 0 50 100 Output Current IOUT (mA) 150 VIN:0.9(V) VIN:2.0(V)
Ripple Voltage Vripple (mV)
120
120 100 80 60 40 20 0 0 50 100 Output Current IOUT (mA) 150 VIN:0.9(V) VIN:1.5(V) VIN:2.0(V)
9
R1210Nxx1x
R1210N501C
ESR:0.33 140 VIN:1.5(V) 140
R1210N501D
ESR:0.33
Ripple Voltage Vripple (mV)
Ripple Voltage Vripple (mV)
120 100 80 60 VIN:0.9(V) 40 20 0 0 50 100 150 200 250 Output Current IOUT (mA) 300 VIN:2.0(V)
120 VIN:1.5(V) 100 80 VIN:0.9(V) 60 40 20 0 0 50 100 150 200 250 Output Current IOUT (mA) 300 VIN:2.0(V)
5)
Start-up Voltage/Hold-on Voltage vs. Output Current (Topt=25C) R1210N301C
Start-up/Hold-on Voltage Vstart/Vhold (V) Start-up/Hold-on Voltage Vstart/Vhold (V)
2.0
R1210N301D
2.0
1.6
Vstart
1.6
Vstart
1.2
1.2
0.8 Vhold 0.4 0.0 0 5 10 15 20 25 Output Current IOUT (mA) 30
0.8 Vhold 0.4 0.0 0 5 10 15 20 25 Output Current IOUT (mA) 30
R1210N501C
Start-up/Hold-on Voltage Vstart/Vhold (V) Start-up/Hold-on Voltage Vstart/Vhold (V)
2.0
R1210N501D
2.0
1.6
Vstart
1.6
Vstart
1.2 Vhold 0.8
1.2 Vhold 0.8
0.4 0.0 0 5 10 15 20 25 Output Current IOUT (mA) 30
0.4 0.0 0 5 10 15 20 25 Output Current IOUT (mA) 30
10
R1210Nxx1x
6)
Output Voltage vs. Temperature R1210N301C
3.10 3.10
R1210N301D
Output Voltage VOUT (V)
3.05 IOUT:10(mA) IOUT:30(mA) 3.00 IOUT:0(mA) 2.95
Output Voltage VOUT (V)
3.05 IOUT:30(mA) 3.00
IOUT:10(mA)
IOUT:0(mA)
2.95
2.90 -50
-25
0 25 50 Temperature Topt (C)
75
100
2.90 -50
-25
0 25 50 Temperature Topt (C)
75
100
R1210N501C
5.15 5.10 5.15 5.10
R1210N501D
Output Voltage VOUT (V)
5.05 5.00 4.95 4.90 4.85 -50
Output Voltage VOUT (V)
IOUT:10(mA) IOUT:30(mA) IOUT:0(mA)
5.05 5.00 4.95 4.90 4.85 -50
IOUT:10(mA) IOUT:30(mA) IOUT:0(mA)
-25
0 25 50 Temperature Topt (C)
75
100
-25
0 25 50 Temperature Topt (C)
75
100
7)
Supply Current 1 vs. Temperature R1210N301A
100
100
R1210N301D
Supply Current ISS1 (A)
Supply Current ISS1 (A)
80
80
60
60
40
40
20 0 -50
20 0 -50
-25
0 25 50 Temperature Topt (C)
75
100
-25
0 25 50 Temperature Topt (C)
75
100
11
R1210Nxx1x
R1210N501C
120 100
Supply Current ISS1 (A)
R1210N501D
120 100
85 60 40 20 0 -50
Supply Current ISS1 (A)
85 60 40 20 0 -50
-25
0 25 50 Temperature Topt (C)
75
100
-25
0 25 50 Temperature Topt (C)
75
100
8)
Supply Current2 vs. Temperature R1210N301A
25
25
R1210N221D
Supply Current ISS2 (A)
15
Supply Current ISS2 (A)
20
20
15
10
10
5 0 -50
5 0 -50
-25
0 25 50 Temperature Topt (C)
75
100
-25
0 25 50 Temperature Topt (C)
75
100
R1210N501C
25
25
R1210N601D
Supply Current ISS2 (A)
Supply Current ISS2 (A)
20
20
15
15
10
10
5 0 -50
5 0 -50
-25
0 25 50 Temperature Topt (C)
75
100
-25
0 25 50 Temperature Topt (C)
75
100
12
R1210Nxx1x
9)
Standby Current vs. Temperature R1210N221A
1.0 1.0
Standby Current Istandby (A)
R1210N221D
0.8 0.6 0.4 0.2 0.0 -0.2 -50
Standby Current Istandby (A)
0.8 0.6 0.4 0.2 0.0 -0.2 -50
-25
0 25 50 Temperature Topt (C)
75
100
-25
0 25 50 Temperature Topt (C)
75
100
R1210N601C
1.0 1.0
Standby Current Istandby (A)
R1210N601D
0.8 0.6 0.4 0.2 0.0 -0.2 -50
Standby Current Istandby (A)
0.8 0.6 0.4 0.2 0.0 -0.2 -50
-25
0 25 50 Temperature Topt (C)
75
100
-25
0 25 50 Temperature Topt (C)
75
100
10) Oscillator Frequency vs. Temperature R1210N221A
300 300
R1210N221D
Oscillator Frequency fosc (kHz)
250 200 150 100 50 0 -50
Oscillator Frequency fosc (kHz)
250 200 150 100 50 0 -50
-25
0 25 50 Temperature Topt (C)
75
100
-25
0 25 50 Temperature Topt (C)
75
100
13
R1210Nxx1x
R1210N601C
300
Oscillator Frequency fosc (kHz)
300
R1210N601D
Oscillator Frequency fosc (kHz)
250 200 150 100 50 0 -50
250 200 150 100 50 0 -50
-25
0 25 50 Temperature Topt (C)
75
100
-25
0 25 50 Temperature Topt (C)
75
100
11) Maximum Duty Cycle vs. Temperature R1210N221A
100 90 80 70 60 50 40 -50 100 90 80 70 60 50 40 -50
R1210N221D
Maximum Duty Cycle (%)
Maximum Duty Cycle (%)
-25
0 25 50 Temperature Topt (C)
75
100
-25
0 25 50 Temperature Topt (C)
75
100
R1210N601C
100 90 100 90
R1210N601D
Maximum Duty (%)
Maximum Duty (%)
80 70 60 50 40 -50
80 70 60 50 40 -50
-25
0 25 50 Temperature Topt (C)
75
100
-25
0 25 50 Temperature Topt (C)
75
100
14
R1210Nxx1x
12) LX Switching Current vs. Temperature R1210N301A
500 500
LX Switching Current I_LXswitch (mA)
R1210N501C
LX Switching Current I_LXswitch (mA)
400
400
300
300
200
200
100 0 -50
100 0 -50
-25
0 25 50 Temperature Topt (C)
75
100
-25
0 25 50 Temperature Topt (C)
75
100
R1210N221D
500 500
LX Switching Current I_LXswitch (mA)
R1210N601D
LX Switching Current I_LXswitch (mA)
400
400
300
300
200
200
100 0 -50
100 0 -50
-25
0 25 50 Temperature Topt (C)
75
100
-25
0 25 50 Temperature Topt (C)
75
100
13) LX leakage Current vs. Temperature R1210N221A
1.0 1.0
R1210N221D
LX Leakage Current ILX_leak (A)
0.8 0.6 0.4 0.2 0.0 -0.2 -50
LX Leakage Current ILX_leak (A)
0.8 0.6 0.4 0.2 0.0 -0.2 -50
-25
0 25 50 Temperature Topt (C)
75
100
-25
0 25 50 Temperature Topt (C)
75
100
15
R1210Nxx1x
R1210N601C
1.0 1.0
LX Leakage Current ILX_leak (A)
R1210N601D
0.8 0.6 0.4 0.2 0.0 -0.2 -50
LX Leakage Current ILX_leak (A)
0.8 0.6 0.4 0.2 0.0 -0.2 -50
-25
0 25 50 Temperature Topt (C)
75
100
-25
0 25 50 Temperature Topt (C)
75
100
14) VLX Voltage Limit vs. Temperature R1210N301A
1.0 1.0
R1210N221D
LX Voltage Limit VLXlim (V)
0.6
LX Voltage Limit VLXlim (V)
0.8
0.8
0.6
0.4
0.4
0.2 0.0 -50
0.2 0.0 -50
-25
0 25 50 Temperature Topt (C)
75
100
-25
0 25 50 Temperature Topt (C)
75
100
R1210N501C
1.0 1.0
R1210N601D
LX Voltage Limit VLXlim (V)
0.6
LX Voltage Limit VLXlim (V)
-25 0 25 50 Temperature Topt (C) 75 100
0.8
0.8
0.6
0.4
0.4
0.2 0.0 -50
0.2 0.0 -50
-25
0 25 50 Temperature Topt (C)
75
100
16
R1210Nxx1x
15) CE "H" Input Voltage vs. Temperature R1210N221A
0.9
R1210N601C
0.9
CE"H" Input Voltage V_CE"H" (V)
CE"H" Input Voltage V_CE"H" (V)
0.8 0.7 0.6 0.5 0.4 0.3 -50
0.8 0.7 0.6 0.5 0.4 0.3 -50
-25
0 25 50 Temperature Topt (C)
75
100
-25
0 25 50 Temperature Topt (C)
75
100
16) CE "L" Input Voltage vs. Temperature R1210N221A
0.9
CE"L" Input Voltage V_CE"L" (V)
R1210N601C
0.9
CE"L" Input Voltage V_CE"L" (V)
0.8 0.7 0.6 0.5 0.4 0.3 -50
0.8 0.7 0.6 0.5 0.4 0.3 -50
-25
0 25 50 Temperature Topt (C)
75
100
-25
0 25 50 Temperature Topt (C)
75
100
17

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