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BD88420GUL-E2

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2011.03 – Rev. A
© 2011 ROHM Co., Ltd. All rights reserved.
Headphone Amplifiers
Coupling Capacitorless
Headphone Amplifiers
BD88400GUL,BD88410GUL,BD88415GUL,BD88420GUL
●Description
BD88xxxGUL is output coupling capacitorless headphone amplifier. This IC has a negative voltage generator of regulated
type built-in and generates the direct regulated negative voltage from the supply voltage. It is possible to drive headphones
in a ground standard with both voltage of the positive voltage (+2.4V) and the negative voltage (-2.4V). Therefore a
large-capacity output coupling capacitor becomes needless and can reduce a cost, a board area, and the height of the part.
In addition, there is not the signal decrement by the low range to happen by output coupling capacitor and output load
impedance and can output a rich low tone.
●Features
1) 2.4V to 5.5V Single-Supply Operation
2) No Bulky DC-Blocking Capacitors Required
3) No Degradation of Low-Frequency Response Due to Output Capacitors
4) Ground-Referenced Outputs
5) Gain setting
BD88400GUL: Variable gain with external resistors
BD88410GUL: -1.0V/V
BD88415GUL: -1.5V/V
BD88420GUL: -2.0V/V
6) Low THD+N
7) Low Supply Current
8) Integrated Negative Power Supply
9) Integrated Short-Circuit and Thermal-Overload Protection
10) Small package
VCSP50L2 (2.1mm x 2.1mm)
●Applications
Mobile Phones, Smart Phones, PDAs, Portable Audio Players, PCs, TVs, Digital Cameras, Digital Video Cameras,
Electronic Dictionaries, Voice Recorders, Bluetooth Head-sets, etc
●Line up
Type
Supply
Voltage
[V]
Supply
Current
[mA]
Gain
[V/V]
Maximum
Output Power
[mW]
THD+N
[%]
Noise
Voltage
[µVrms]
PSRR
[dB]
Package
BD88400GUL
2.4～5.5
2.0
(No signal)
Variable gain
with external
resister
80
(VDD=3.3V,RL=16Ω
THD+N≦1%,f=1kHz)
0.006
(VDD=3.3V,RL=16Ω
Po=10mW,f=1kHz)
10
-80
(f=217Hz)
VCSP50L2
(2.1mm x 2.1mm)
BD88410GUL -1.0
BD88415GUL -1.5
BD88420GUL -2.0
No.11102EAT04
Technical Note
2/21
BD88400GUL,BD88410GUL,BD88415GUL,BD88420GUL
www.rohm.com
2011.03 – Rev. A
© 2011 ROHM Co., Ltd. All rights reserved.
●Absolute maximum ratings
Parameter Symbol Ratings Unit
SGND to PGND voltage
V
GG
0.0 V
SVDD to PVDD voltage
V
DD
-0.3～0.3 V
SVSS to PVSS voltage
V
SS
0.0 V
SGND or PGND to SVDD, PVDD voltage
V
DG
-0.3～6.0 V
SVSS, PVSS to SGND or PGND voltage
V
SG
-3.5～0.3
V
SGND to IN_- voltage
V
IN
(SVSS-0.3)～2.8 V
SGND to OUT_- voltage
V
OUT
(SVSS-0.3)～2.8
V
PGND to C1P- voltage
V
C1P
(PGND-0.3)～(PVDD+0.3) V
PGND to C1N- voltage
V
C1N
(PVSS-0.3)～(PGND+0.3)
V
SGND to SHDN_B- voltage
V
SH
(SGND-0.3)～(SVDD+0.3) V
Input current
I
IN
-10～10
mA
Power Dissipation
P
D
1350 * mW
Storage Temperature Range
T
STG
-55～150 ℃
* In operating over 25 ℃, de-rate the value to 10.8mW/℃. This value is for mounted on the application board
(Grass-epoxy, size: 40mm x 60mm, H=1.6mm, Top Copper area = 79.9%, Bottom Copper area = 80.2%).
●Operating conditions
Parameter Symbol
Ratings
Unit
Min. Typ. Max.
Supply Voltage Range
V
SVDD
,V
PVDD
2.4 - 5.5 V
Operating Temperature Range
T
OPR
-40 - +85 ℃
Technical Note
3/21
BD88400GUL,BD88410GUL,BD88415GUL,BD88420GUL
www.rohm.com
2011.03 – Rev. A
© 2011 ROHM Co., Ltd. All rights reserved.
●Electrical characteristics
Unless otherwise specified, Ta=25℃, SVDD=PVDD=3.3V, SGND=PGND=0V, SHDNB=SVDD, C1=C2=2.2µF,
RL=No Load, Ri=Rf=10kΩ
Parameter Symbol
Limits
Unit Conditions
Min. Typ. Max.
Supply Current
Shutdown Supply Current I
ST
- 0.1 2 µA SHDNLB=SHDNRB=L
Quiescent Supply Current
I
DD1
- 1.3 - mA
(SHDNLB,SHDNRB)=(H,L) or (L,H),
No signal
I
DD2
- 2.0 7.4 mA
SHDNLB=SHDNRB=H,
No signal
SHDN_B Terminal
H Level Input Voltage V
IH
1.95 - - V
L Level Input Voltage V
IL
- - 0.70 V
Input Leak Current I
LEAK
- - ±1 µA
Headphone Amplifier
Shutdown to Full Operation t
SON
- 80 - µs SHDNLB=SHDNRB=L→H
Offset Voltage V
IS
- ±0.5 ±5.0 mV
Maximum Output Power P
OUT
30 60 - mW
RL=32Ω, THD+N≦-40dB, f=1kHz,
20kHz LPF, for Single Channel
40 80 - mW
RL=16Ω, THD+N≦-40dB, f=1kHz,
20kHz LPF, for Single Channel
Total Harmonic Distortion
+ Noise
THD+N
- 0.008 0.056 %
RL=32Ω, POUT=10mW, f=1kHz,
20kHz LPF
- 0.006 0.100 %
RL=16Ω, POUT=10mW, f=1kHz,
20kHz LPF
Input Impedance Z
IN
10 14 19 kΩ
SHDNLB=SHDNRB=H
In BD88400GUL, ZIN = Ri
Gain
BD88400GUL
A
V
- -1.00 -
V/V
In BD88400GUL, Gain is variable
by the external resister of Ri and Rf.
BD88410GUL -1.05 -1.00 -0.95
BD88415GUL -1.55 -1.50 -1.45
BD88420GUL -2.06 -2.00 -1.94
Gain match ΔA
V
- 1 - %
Noise V
N
- 10 - µVrms 20kHz LPF + JIS-A
Slew Rate SR - 0.15 - V/µs
Maximum Capacitive Load CL - 200 - pF
Crosstalk CT - -90 - dB
RL=32Ω, f=1kHz, VOUT=200mV
P-P
,
1kHz BPF
Power Supply
Rejection Ratio
PSRR - -80 - dB
f=217Hz, 100mV
P-P
‐ripple,
217Hz BPF
Charge-Pump
Oscillator Frequency
f
OSC
200 300 430 kHz
Thermal-Shutdown Threshold TSD - 145 - ℃
Thermal-Shutdown Hysteresis T
HYS
- 5 - ℃
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BD88420GUL-E2

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Description:
Audio Amplifiers Audio Amp Headphone 2-CH Stereo 0.08W Class-AB T/R
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