SM8140A
BLOCK DIAGRAM
High Voltage
Switching Circuit
ENA
Enable Circuit
Charge Pump
Circuit
CPO
CP1
CP2
Level Shifter
Divider
Divider
Oscillation Circuit
for Voltage Booster
Oscillasion Circuit
for output
PIN DESCRIPTION
SSOP
1
chip
11
12
13
14
4
Pin Name
CHV
i / o
i
Function
DC high voltage pin
−
MONG
LDR
o
o
−
−
o
i
Monitor gate
2
Step − up inductor driver output
3
VSS1
VSS2
OCL2
OCL1
OCE2
OCE1
ENA
GND
GND
−
4
15
16
1
CR oscillator pin for step − up inductor and charge pump.
External resistor at this pin determines oscillator frequency.
5
6
i
CR oscillator pin for output
7
2
o
External resistor at this pin determines oscillator frequency
Output control pin. Output from OUT1 and OUT2 pins are stopped When "L".
Power supply pin
1
8
3
ip
9
5
VDD
−
o
o
o
o
o
10
11
12
13
14
6
CPO
Charge pump output (Voltage output for driving high voltage MOS)
Charge pump external capacitor pin
Charge pump external capacitor pin
Output for EL
7
CP1
8
CP2
9
OUT2
OUT1
10
Output for EL
1. "ip" defines input pin with pull down internal resistor
NIPPON PRECISION CIRCUITS—3
NPC [ NIPPON PRECISION CIRCUITS INC ]
