S8880A Datasheet, PDF (9/30 Pages) Seiko Instruments Inc – ENERGY HARVESTING POWERED BY ULTRA-LOW POWER AND ULTRA-LOW VOLTAGE OPERATION BOOST CHARGE PUMP FOR STEP-UP DC-DC CONVERTER STARTUP

ENERGY HARVESTING POWERED BY ULTRA-LOW POWER AND ULTRA-LOW VOLTAGE OPERATION BOOST CHARGE PUMP FOR STEP-UP DC-DC CONVERTER STARTUP
Rev.1.0_01
S-8880A Series
The following are the connection examples based on the set condition.
The symbols used in the connection diagrams are described in Table 9 below.
Element Name
Schottky diode
Capacitor
Schottky diode
Pull-down resistor
Bleeder resistor
Bleeder resistor
Symbol Constant
SD1
C_VDD
SD2
R_OUT
R₁
R₂
−
C_CPOUT × 0.1 or
lower
−
−
−
−
Table 9
Description
Preventing a voltage drop of the VDD pin due to output
capacitor C_L at step-up DC-DC converter startup
Power smoothing capacitor of the step-up DC-DC converter
Preventing the OUT pin voltage of the S-8880A Series from
exceeding the absolute maximum rating
Preventing the VM pin voltage of the S-8880A Series from
exceeding the absolute maximum rating
1. V_OUT ≤ 3.0 V, C_L ≤ C_CPOUT × 0.1, no load
V_IN
C_CPOUT
CPOUT
OUT
VIN _{S-8880A Series}
VM
CIN
VSS
VDD
VIN _{Step-up DC-DC converter} VOUT
VSS
V_VOUT
CL
2. V_OUT ≤ 3.0 V, C_L > C_CPOUT × 0.1
V_IN
C_CPOUT
CPOUT
OUT
VIN _{S-8880A Series}
VM
CIN
VSS
Figure 7
SD1
VDD
CVDD
VIN _{Step-up DC-DC converter} VOUT
VSS
V_VOUT
CL
Figure 8
9