RP600K SERIES
Step-Up DC_DC Converter with voltage regulator and detector
NO.EA-237-160330
OUTLINE
RP600K series are high efficiency, current mode step-up DC-DC converter ICs with a voltage regulator
and a voltage detector. This converter starts up of low voltage (typ. 0.8V) operation from one or two
alkaline or nickel-metal-hydride (NiMH) batteries, or a single Li+ battery.
This IC consists of a reference voltage unit with soft start, error amplifiers, PWM comparator, protection
circuits such as a current limit circuit, an internal switch transistor, an oscillator, and PWM/VFM mode
control circuit. A low ripple high efficiency step-up DC/DC converter can be composed of RP600K series
with only an inductor, a diode, divider resistors and capacitors. In terms of output voltage setting, fixed type
and adjustable with external divider resisters type are available. Output voltage is from 2.3V to 5.5V.
The built-in LDO Regulator(VR) consists of a reference voltage unit, an error amplifier, output voltage
setting resister net, a short current limit circuit, an output transistor, and so on. To prevent the inrush
current at start-up, soft-start function is included. The Soft-start time is typically 200s. The output voltage
is fixed internally and the output range is from 1.5V to 5.0V.
This IC has an MODE pin. When the MODE pin is set as "H", the DC/DC converter control becomes fixed
PWM control, and the LDO becomes the fast mode. When the MODE pin is set as "L", the DC/DC
converter is automatic PWM/VFM control and the LDO becomes low power mode*.
The voltage detector always turns on. The output is Nch open drain type. Since the package is
DFN(PLP)2527-10, so high density mounting on board is possible. If the internal chip temperature is
beyond the certain level, system reset will work, or thermal shutdown circuit is included in the IC.
*) The switch-over point is fixed internally. As for A/D version, regardless the MODE pin signal, LDO mode
is always set at fast mode. As for B/C version, regardless the MODE pin signal, when the DC/DC
converter is active, LDO becomes fast mode.
Functions
A version: The input power supply of the built-in voltage regulator (LDO) is the output of the built-in DC/DC
converter. After the soft-start function of the DC/DC converter, the LDO starts up. The built-in voltage
detector outputs "L" when the supervised level becomes lower than the set detector threshold level. The
output delay circuit for release the voltage detector is also built-in and the delay time is set at typically
10ms.
B version: The input power supply of the built-in voltage regulator (LDO) and the DC/DC converter is VDD
pin. Each channel is individual. The minimum operating voltage of the LDO is 2.0V. The output of the
DC/DC converter is fixed internally. If the DC/DC is active, the LDO mode becomes fixed fast mode. The
built-in voltage detector outputs "L" when the supervised level becomes lower than the set detector
threshold level. The output delay circuit for release the voltage detector is also built-in and the delay time is
set at typically 10ms.
C version: The input power supply of the built-in voltage regulator (LDO) is the output of the built-in DC/DC
converter. The voltage regulator is always active. The output of the DC/DC converter is fixed internally.
The built-in voltage detector outputs "L" when the supervised level becomes lower than the set detector
threshold level. The output delay circuit for release the voltage detector is not included. The hysteresis
range can be selected from 30% of the set voltage detector threshold to 80% of the detector threshold.
D version: The input power supply of the built-in voltage regulator (LDO) and the DC/DC converter is VDD
pin. The output of the DC/DC converter is adjustable with external divider resisters. The built-in voltage
detector outputs "L" when the supervised level becomes lower than the set detector threshold level. The
output delay circuit for release the voltage detector is also built-in and the delay time is set at typically
10ms.
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RP600K
FEATURES
Step-up DC/DC converter part
●
Input Voltage Range ···································· 0.8V~5.5V
●
High Efficiency ··········································· 87% (100mA/3.3V, V
IN
=1.5V, 25°C)
●
Output current ············································ 500mA/4.2V(V
IN
=2.5V)
●
Internal Switch ··········································· NMOS=0.16Ω, (if V
OUT1
=3.3V)
●
Output Voltage Tolerance ····························
2.0%
●
Frequency················································· Typ. 1.2MHz
●
Output Voltage Range ································· Fixed: Standard voltage in the range from 2.3V to 5.5V
Adjustable: 2.3V~5.5V (Recommendation range of output
voltage)
●
Lx peak current control function ··················· Typ. 1.4A
LDO regulator part
*Input Voltage Range (Applied to B version only) ········ from 2.0V to 5.5V
●
Output Voltage Range ····································· Fixed: Standard voltage in the range from 1.5V to 5.0V
●
Output Voltage Tolerance ·································
1.0%
●
Turn-on Speed ··············································· Typ. 100s
●
Maximum Output Current ································· Min. 500mA guaranteed (A/D version)
······································································· Min. 300mA guaranteed (B version)
······································································ Min. 150mA guaranteed (C version)
Voltage Detector Part
●
Detector Threshold Range ································ Fixed: Standard voltage in the range from 1.0V to 4.5V
●
Released Output Delay Time ····························· Typ. 10ms (A/B/D version)
······································································· Typ. 0ms (C version)
●
Detector Threshold Hysteresis ························ Typ. 5% of the detector threshold voltage (A/B/D version)
Selectable in the range from 30% to 80% of the detector
threshold voltage (C version)
Others
●
Small Package ··············································· DFN(PLP)2527-10
●
Thermal shutdown temperature threshold ············ Tj=125C (A/B/D version only)
●
External components ······································· C
IN
=10F, C
OUT1
=10Fx2, L=3.3H(If the output of the
DC/DC is 3.6V or more, 4.7uH is our recommendation value.)
······································································· C
OUT2
=2.2F(B/C version LDO)
······································································· C
OUT2
=10uF(A/D version LDO)
APPLICATIONS
●
Portable equipment such as DSC, cellular phones, electrical dictionaries, IC recorders
●
Blood pressure meter
●
Smoke Detector
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