BH76906GU-E2 Rohm Semiconductor, BH76906GU-E2 Datasheet - Page 5

• Manufacturer Part Number: BH76906GU-E2
• Description: IC VIDEO DRIVER CAP-LESS 8WLCSP
• Manufacturer: Rohm Semiconductor

Specifications of BH76906GU-E2

• Package / Case: 8-WLCSP
• Applications: Driver
• Number Of Circuits: 1
• Current - Supply: 17mA
• Current - Output / Channel: 30mA
• Voltage - Supply, Single/dual (±): 2.5 V ~ 3.45 V, ±1.25 V ~ 1.725 V
• Mounting Type: Surface Mount
• Svhc: No SVHC (18-Jun-2010)
• Base Number: 76906
• No. Of Pins: 8
• Operating Temperature Range: -40°C To +85°C
• Power Dissipation Pd: 580mW
• Supply Current: 17mA
• Supply Voltage: RoHS Compliant
• Supply Voltage Max: 3.45V
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

●Description of Operation
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1) Principles of output coupling capacitorless video drivers
2) Occurrence of negative voltage due to charge pump circuit
Note 1) DC voltages in the figure are those when VCC ＝ 3.0 V. Moreover, these values are reference values which are
Note 2) Numeric values in the figure are settings which do not guarantee ratings.
For an amplifier operated from dual power supplies (+ supply), since the operating point can be at GND level, a coupling
capacitor for preventing output of direct current is not needed.
A charge pump, as shown in Fig. 5, consists of a pair of switches (SW1, SW2) and a pair of capacitors (flying capacitor,
anchor capacitor). Switching the pair of switches as shown in Fig. 5 causes a negative voltage to occur by shifting the
charge in the flying capacitor to the anchor capacitor as in a bucket relay.
For an amplifier operated from a single power supply (single-supply), since the operating point has a potential of
approximately 1/2 Vcc, a coupling capacitor is required for preventing direct current in the output. Moreover, since the
load resistance is 150 Ω (75 Ω + 75 Ω) for the video driver, the capacity of the coupling capacitor must be on the order of
1000 μF if you take into account the low band passband. (Fig.3)
Moreover, since a coupling capacitor is not needed, in principle, there is no lowering of the low band characteristic at the
output stage. (Fig.4)
C1
B1
In this IC, by applying a voltage of +3 V, a negative voltage of approximately -2.8 V is obtained.
Single-supply amplifier
not guaranteed.
C_MINUS
NVCC
VCC
1/2 V
Fig.3
1000μF
CC
GND
VCC
VCC
VCC
GND
VCC
bias
Output capacitor required since DC
voltage is occurring at output pin
75Ω
75Ω
NVCC
C_MINUS
C2
5/16
(-2.75 V)
(-2.75 V)
-VCC
-VCC
↑↓
0V
Dual-supply amplifier
C1
Flying capacitor “-“ pin (8pin)
C2
Negative voltage pin (7pin)
-VCC
VCC
Fig.4
NVC
75Ω
Output capacitor not required since
DC voltage does not occur at output
pin
75Ω
Technical Note
2009.03 - Rev.A
NVC
0V