RP601x Series
1000 mA Buck-Boost DC/DC Converter with Synchronous Rectifier
NO. EA-333-150123
OUTLINE
The RP601x is a CMOS-based 1000 mA buck-boost DC/DC converter with synchronous rectifier. Internally,
the RP601x consists of an oscillator circuit, a reference voltage unit, an error amplifier circuit, a switch control
circuit, a mode control circuit, a soft-start circuit, an undervoltage lockout (UVLO) circuit, an overcurrent
protection circuit, a thermal shutdown circuit and switching transistors.
The RP601x provides the forced PWM control or the PWM/ VFM auto switching control. The forced PWM
control switches at fixed frequency rate in low output current in order to reduce noise. Likewise, the PWM/
VFM auto switching control automatically switches from PWM mode to VFM mode in low output current in
order to achieve high efficiency. RICOH’s unique control method can suppress a ripple voltage in the VFM
mode, thus the RP601x can achieve both low ripple voltage at light load and high efficiency.
The RP601x can be switched into forced bypass mode in PWM/ VFM auto switching control by pulling the BP
pin high. The RP601x features forced bypass mode with a typical 5 µA current consumption that can maximize
the battery life.
The RP601x is offered in a 16-bump WLCSP package measuring 1.95 mm x 1.95 mm which can achieve the
smallest possible footprint solution on board where area is limited.
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RP601x
NO. EA-333-150123
FEATURES
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*1
Input Voltage Range (Maximum Rating) ............... 2.3 V to 5.5 V (6.5 V)
Output Voltage Range........................................... 2.75 V to 4.2 V
Output Step Voltage .............................................. Typ. 50 mV
Output Voltage Setting .......................................... Single-wire (S-Wire) interface
*1
Output Voltage Accuracy....................................... PWM mode = ±2%, VFM mode = PWM mode + 2%
Output Voltage Temperature Coefficient ............... Typ. ±50 ppm/°C
Line Regulation ..................................................... Typ. 0.5% (PWM mode)
Load Regulation .................................................... Typ. 0.5% at I
OUT
= 10 mA to 800 mA (PWM mode)
Maximum Output Current .................................... Typ. 1.0 A
Output Pulsed Current .......................................... Max. 2.0 A
(t = 10 ms, On Duty = 0.1 (ton = 1 ms), V
IN
= 3.6 V, V
SET
= 3.3 V)
BULX Current Limit ............................................... Typ. 4.0 A
Oscillator Frequency ............................................. Typ. 2.4 MHz
Built-in Driver ON Resistance ............................... Typ. Pch. 80 mΩ, Nch. 80 mΩ (V
IN
= 3.6 V)
Device Quiescent Current ..................................... Typ. 45 µA (VFM mode)
Standby Current .................................................... Max. 5 µA
Quiescent Current in Forced Bypass Mode .......... Typ. 5 µA
UVLO Detector Threshold..................................... Typ. 2.1 V
Soft-start Function
Power Good Function
Thermal Shutdown
Package ................................................................ WLCSP-16-P1, 1.95 mm x 1.95 mm
The default set output voltage (Default V
SET
) is set by Fix Trimming (selectable from 2.75 V to 4.20 V in 0.05 V step)
APPLICATIONS
•
•
Power source for portable equipment such as laptops, PDAs, DSCs, cellular phones and smartphones
Power source for Li-ion battery-used equipment
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RP601x
NO. EA-333-150123
BLOCK DIAGRAM
RP601x Block Diagram
PV
IN
BULX
BOLX
V
OUT
AV
IN
BP
(S-wire input pin)
GND
CE
UVLO
TSHUT
PG
Buck/Boost
CTRL
CE
PG
MODE
Mode CTRL
SELECTION GUIDE
Selection Guide
Product Name
RP601Zxxx∗-E2-F
Package
WLCSP-16-P1
Quantity per Reel
5,000 pcs
Pb Free
Yes
Halogen Free
Yes
xxx: Specify the default set output voltage (Default V
SET
) from 2.75 V (275) to 4.20 V (420) in 0.05 V step.
∗
: Specify the auto-discharge option.
A: Auto-discharge function included
B: Auto-discharge function not included
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RP601x
NO. EA-333-150123
PIN DESCRIPTION
Top View
Bottom View
4
3
2
1
A B C D
4
3
2
1
D C B A
WLCSP-16-P1 Pin Configuration
WLCSP-16-P1 Pin Description
Pin No
C3, C4
B3, B4
D1
C1
B1
A1
D3, D4
A3
A4
A2, B2, C2, D2
Symbol
BOLX
BULX
PG
CE
BP
MODE
V
OUT
AV
IN
PV
IN
GND
Pin Description
Boost Switching Output LX
Buck Switching Output LX
Power Good Output Pin, Nch Open Drain
Chip Enable and S-Wire Control Input Pin
Forced Bypass Mode Setting Input Pin
Forced Bypass Mode: “H”
Mode Control Pin
Forced PWM Control: “H”
PWM/VFM Auto Switching Control: “L”
Buck-Boost Output Pin
Analog Power Input Pin
Power Input Pin
Power GND Pin
Same symbol pins must be connected together (BOLX (C3 and C4), BULX (B3 and B4), and V
OUT
(D3 and D4).
The AV
IN
(A3) and PV
IN
(A4) pins must be connected together in the application.
GND must be tied to the ground in the application (A2, B2, C2, and D2).
Pin Truth Table
CE Pin
“L”
MODE Pin
*1
-
“L”
BP Pin
-
“L”
“H”
“L”
“H”
*2
Operation
OFF
PWM/ VFM Auto Switching Control Mode
Forced Bypass Mode
Forced PWM Control Mode
Forced Bypass Mode
“H”
“H”
*1
*2
The logic to the MODE pin should not be changed while CE = “H”.
The logic to the BP pin should not be changed while MODE = “H” and CE = “H”.
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RP601x
NO. EA-333-150123
ABSOLUTE MAXIMUM RATINGS
Absolute Maximum Ratings
Symbol
V
IN
V
LX
V
CE
V
MODE
V
BP
V
OUT
P
D
Ta
Tstg
*1
Item
Rating
−0.3 to 6.5
−0.3 to V
IN
+ 0.3
−0.3 to 6.5
−0.3 to 6.5
−0.3 to 6.5
−0.3 to 6.5
1400
−40 to 85
−55 to 125
Unit
V
V
V
V
V
V
mW
°C
°C
AV
IN
/ PV
IN
Input Voltage
L
X
Pin (BULX, BOLX) Voltage
CE Pin Input Voltage
MODE Pin Input Voltage
BP Pin Input Voltage
V
OUT
Pin Voltage
Power Dissipation
(JEDEC STD. 51-9 Test Land Pattern)
*1
Operating Temperature Range
Storage Temperature Range
Refer to
PACKAGE INFORMATION
for detailed information.
ABSOLUTE MAXIMUM RATINGS
Electronic and mechanical stress momentarily exceeded absolute maximum ratings may cause the permanent
damages and may degrade the life time and safety for both device and system using the device in the field. The
functional operation at or over these absolute maximum ratings are not assured.
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