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PDF R5220x Data sheet ( Hoja de datos )
| Número de pieza | R5220x | |
| Descripción | PWM Step-down DC/DC Converter | |
| Fabricantes | RICOH electronics devices division | |
| Logotipo |  |
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R5220x SERIES
PWM Step-down DC/DC Converter with switch function
NO.EA-121-070824
OUTLINE
The R5220x Series are CMOS-based PWM step-down DC/DC Converters with synchronous rectifier, low
supply current and LDO mode.
DC/DC converter of the R5220x consists of an oscillator, a PWM control circuit, a reference voltage unit, an
error amplifier, a soft-start circuit, protection circuits, a protection against miss operation under low voltage
(UVLO), PWM-DC to DC converter / LDO alternative circuit, a chip enable circuit, and a driver transistor. A high
efficiency step-down DC/DC converter can be easily composed of this IC with only a few kinds of external
components, or an inductor and capacitors.
LDO of the R5220x consists of a vortage reference unit, an error amplifier, resistors for voltage setting, output
current limit circuit, a driver transistor, and so on. The output voltage is fixed internally in the R5220x. The output
voltage of the DC/DC converter and the LDO can be set independently.
PWM step-down DC/DC converter / LDO alternative circuit is active with Mode Pin of the R5220x Series. Thus,
when the load current is small, the operation can be switching into the LDO operation from PWM operation by
the logic of MODE pin and the consumption current of the IC itself will be small at light load current. As protection
circuits, the current limit circuit which limits peak current of Lx at each clock cycle, and the latch type protection
circuit which works if the term of the over-current condition keeps on a certain time in PWM mode. Latch-type
protection circuit works to latch an internal driver with keeping it disable. To release the protection, after disable
this IC with a chip enable circuit, enable it again, or restart this IC with power-on or make the supply voltage at
UVLO detector threshold level or lower than UVLO.
FEATURES
• Supply Current ................................................................ Typ. 350µA (DC/DC), Typ. 5µA (VR)
• Standby Current .............................................................. Typ. 0.1µA
• Built-in Driver ON Resistance ......................................... P-channel 0.5Ω, N-channel 0.5Ω (at VIN=3.6V)
• Output Current ................................................................ Min. 400mA (DC/DC), Min. 50mA (VR)
• Input Voltage ................................................................... 2.8V to 5.5V (Absolute Input Maximum: 6.5V)
• Output Voltage ................................................................ 1.0V to 3.3V
• Output Voltage Accuracy................................................. ±2.0% (VOUT >= 1.5), ±30mV (VOUT <1.5V)
• Oscillator Frequency (DC/DC) ........................................ Typ. 1.2MHz
• Package .......................................................................... SON-6, PLP2514-6
• Built-in Soft-start Function............................................... Typ. 0.2ms
• Latch-type Protection Function (Delay Time).................. Typ. 3.0ms
• Built-in fold-back protection circuit (DC/DC, VR)
• Ceramic Capacitor is recommended.
APPLICATIONS
• Power source for portable equipment such as DSC, DVC, and communication equipment.
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1 page  
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R5220x
• R5220xxxxB
Symbol
Item
Conditions
VIN Operating Input Voltage
ISS1
Supply Current 1
(Standby mode)
VIN=VOUT1+1.0V, VCE=GND, VMODE=GND or VIN
VOUT1:DC/DC Set VOUT
ISS2
Supply Current 2
(Power Save mode)
VIN=VCE=VMODE=VOUT2+1.0V,
VOUT2:VR Set VOUT, IOUT=0mA
ISS3 Supply Current 3
VIN=VCE=3.6V, VMODE=GND
Min.
2.8
Typ.
0.1
5
350
Topt=25°C
Max. Unit
5.5 V
1.0 µA
10 µA
450 µA
DC/DC Part
Symbol
Item
VOUT1 Output Voltage
fosc Oscillator Frequency
TSTART Soft-start Time
RONP ON Resistance of Pch Transistor
RONN ON Resistance of Nch Transistor
ILXLEAK Lx Leakage Current
∆VOUT/ Output Voltage
∆Topt Temperature Coefficient
Maxduty Oscillator Maximum Duty Cycle
ILXlim Lx Current Limit
Tprot Protection Delay Circuit
VUVLO1 UVLO Threshold Voltage
VUVLO2 UVLO Released Voltage
VMODEH MODE "H" Input Voltage
VMODEL MODE "L" Input Voltage
Conditions
VIN=3.6V
VOUT1 >= 1.5
IOUT=50mA
VOUT1<1.5
VIN=VSET1+1.5V
VIN=3.6V
VOUT1<1.5
VOUT1 >= 1.5
VIN=3.6V, ILX=−100mA
VIN=3.6V, ILX=−100mA
VIN=5.5V, VCE=0V, LX=5.5V/0V
−40°C <= Topt <= 85°C
VOUT=0V
VIN=3.6V
VIN=3.6V
VCE=VIN, VMODE=GND, VOUT=0V
VCE=VIN, VMODE=GND, VOUT=0V
Min.
×0.98
−0.03
0.96
−1.0
100
500
1.0
2.00
2.05
1.0
0
Typ.
1.20
0.15
0.20
0.5
0.5
±150
800
3.0
2.35
2.45
Topt=25°C
Max. Unit
×1.02
+0.03
V
1.44 MHz
0.30
0.35
ms
Ω
Ω
1.0 µA
ppm/°C
%
mA
7.0 ms
2.75 V
2.80 V
V
0.3 V
VR Part
Symbol
Item
Conditions
VOUT2 Output Voltage
VIN=VOUT2+1.0V
IOUT=10mA
VOUT2 >= 1.5
VOUT2<1.5
IOUT Output Current
VIN=VOUT2+1.0V
∆VOUT2/
∆IOUT
Load Regulation
VIN=VOUT2+1.0V
10µA <= IOUT <= 25mA
VOUT2<2.3
2.3 <= VOUT2<3.0
VOUT2 >= 3.0
VDIF Dropout Voltage
∆VOUT2/
∆VIN
Line Regulation
IOUT=50mA
2.8V <= VIN <= 5.5V
IOUT=25mA
VOUT2<1.8V
VOUT2 >= 1.8V
VOUT2<2.3V
VOUT2+0.5V <= VIN <= 5.5V
IOUT=25mA
VOUT2 >= 2.3V
RR Ripple Rejection
Refer to Typical Characteristics
∆VOUT/ Output Voltage
IOUT=30mA,
∆Topt Temperature Coefficient −40°C <= Topt <= 85°C
Ilim Short Current Limit
VOUT=0V
IPDC CE pull-down current
VCEH CE "H" Input Voltage
VCEL CE "L" Input Voltage
Min.
×0.98
−0.03
50
0.12
1.0
0
Typ.
15
25
35
0.7
0.3
±100
60
0.40
Topt=25°C
Max. Unit
×1.02
+0.03
V
mA
40
50 mV
65
V
0.2 %/V
dB
ppm/°C
0.70
0.3
mA
µA
V
V
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5 Page 
TEST CIRCUITS
Lx VVIN
GGNNDD VVOUT
MMOODDEE CE
A
Supply Current 1,2,3
OSCILLOSCOPE
Lx
VVIN
GNNDD VVOUT
MOODDEE CE
Oscillator Frequency
Lx VVIN
GNNDD VVOUT
A
MOODDEE CE
Lx Leakage Current
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R5220x
OSCILLOSCOPE
Lx
VVIN
GNNDD VVOUT
MOODDEE CE
Output Voltage(DC/DC)
OSCILLOSCOPE
Lx
VVIN
GNNDD VVOUT
MOODDEE CE
Soft-start Time
OSCILLOSCOPE
Lx
VVIN
GNNDD VVOUT
MOODDEE CE
Lx Current Limit, Output Delay for Protection
Lx Pch transistor ON resistance
Nch transistor ON resistance
11
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| Páginas | Total 25 Páginas | |
| PDF Descargar | [ Datasheet R5220x.PDF ] | |
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