Instruction Manual

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Gate Drivers

Class-H

Controller

Advanced ΔΣ

Modulator

Gate Drivers

Internal

Oscillator

Gain

Audio In +

Audio In -

Shutdown

Speaker Out +

Speaker Out -

GND

VBATT

2.5V - 5V

LDO Filter

Short Circuit/Thermal

Protection

MODE

Low Drop-Out

Voltage Regulator

3.0 W Mono Class-D Audio Amplifier with Low Idle Current

CS35L01 and CS35L03 Features

 Filterless Hybrid Class-D Architecture

– <1 mA Quiescent Current

– 1 x 3.0 W into 4  (10% THD+N)

– 1 x 2.4 W into 4  (1% THD+N)

– 1 x 1.7 W into 8  (10% THD+N)

– 1 x 1.4 W into 8  (1% THD+N)

 Advanced  Closed-loop Modulation

– 98 dB Signal-to-Noise Ratio (A-Weighted)

– 0.02% THD+N @ 1 W (SD & HD Mode)

 Integrated Protection and Automatic Recovery

for Output Short-circuit and Thermal Overload

 Pin-compatible 9-ball WLCSP family for easy

upgrade path

– CS35L01: +6 dB default Gain

– CS35L03: +12 dB default Gain

 Pop and Click Suppression

Common Applications

 Mobile Phones

 Laptops/Netbooks/Tablets

 Portable Navigation Devices

 Active Speakers

 Portable Gaming

General Description

The CS35L01 and the CS35L03 are 3.0W high efficien-

cy Hybrid Class-D audio amplifiers with low idle current

consumption.

The CS35L01/03 features an advanced closed-loop ar-

chitecture to provide 0.02% THD+N at 1 W and -87 dB

PSRR at 217 Hz.

A flexible Hybrid Class-D output stage offers four

modes of operation: Standard Class-D (SD) mode of-

fers full audio bandwidth and high audio performance;

Hybrid Class-D (HD) mode offers a substantial reduc-

tion in idle power consumption with an integrated Class-

H controller; Reduced Frequency Class-D (FSD) mode

reduces the output switching frequency, producing low-

er electromagnetic interference (EMI); and Reduced

Frequency Hybrid Class-D (FHD) mode produces both

the lower idle power consumption of HD mode and the

reduced EMI benefits of FSD mode.

Requiring minimal external components and PCB

space, the CS35L01 and CS35L03 are available in a

1.2 mm x 1.2 mm, 9-ball WLCSP package in Commer-

cial grade (-10°C to +70°C). Please see “Ordering

Information” on page 33 for package options and gain

configurations.

CS35L01/03

JULY '11

DS909F1

Summary of content (33 pages)

PAGE 1
CS35L01/03 3.0 W Mono Class-D Audio Amplifier with Low Idle Current CS35L01 and CS35L03 Features General Description  Filterless Hybrid Class-D Architecture The CS35L01 and the CS35L03 are 3.0W high efficiency Hybrid Class-D audio amplifiers with low idle current consumption.     – <1 mA Quiescent Current – 1 x 3.0 W into 4  (10% THD+N) – 1 x 2.4 W into 4  (1% THD+N) – 1 x 1.7 W into 8  (10% THD+N) – 1 x 1.
PAGE 2
CS35L01/03 TABLE OF CONTENTS 1. BALL DESCRIPTIONS FOR CS35L01 & CS35L03 .............................................................................. 5 2. DIGITAL BALL CONFIGURATIONS ..................................................................................................... 6 3. TYPICAL CONNECTION DIAGRAMS ................................................................................................... 7 4. CHARACTERISTICS & SPECIFICATIONS .......................................................
PAGE 3
CS35L01/03 LIST OF FIGURES Figure 1. Top View of WLCSP Pinout (Looking down through die) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Figure 2. Typical Connection Diagram for SD & FSD Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Figure 3. Typical Connection Diagram for HD & FHD Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Figure 4. Adjusting Gain via External Series Resistance . . . . . .
PAGE 4
CS35L01/03 Figure 53. Efficiency vs. Output Power - FHD Mode RL = 4 W + 33 mH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 Figure 54. Supply Current vs. Output Power - FHD Mode RL = 8 W + 33 mH . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 Figure 55. Supply Current vs. Output Power - FHD Mode RL = 4 W + 33 mH . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 LIST OF TABLES Table 1. LFILT+ and MODE Operation Configurations . . . . . . . . . . . . . . . . . . . . . . . .
PAGE 5
CS35L01/03 1. BALL DESCRIPTIONS FOR CS35L01 & CS35L03 A1 IN+ B1 A2 MODE B2 LFILT + VBATT C1 C2 IN- SD A3 OUT- B3 GND C3 OUT+ Figure 1. Top View of WLCSP Pinout (Looking down through die) Ball Name # Description IN+ A1 Positive Analog Input (Input) - Differential positive audio signal input. MODE A2 Switching Mode (Input) - Controls the output switching modes of the CS35L01/03. OUT- A3 Negative PWM Output (Output) - Differential negative PWM output.
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CS35L01/03 2. DIGITAL BALL CONFIGURATIONS See (Note 1) and (Note 2) below the table. Power Supply VBATT I/O Name Ball Direction Internal Connections Configuration SD C2 Input No Internal Pull Up Hysteresis on CMOS Input MODE A2 Input No Internal Pull Up Hysteresis on CMOS Input Note: 1. Refer to specification table “Digital Interface Specifications and Characteristics” on page 14 for details on the digital I/O characteristics. 2.
PAGE 7
CS35L01/03 3. TYPICAL CONNECTION DIAGRAMS 2.5V - 5V 0.1uF System Controller LFILT+ 10uF VBATT MODE SD Audio In+ AIN+ Audio In- AIN+ OUT+ OUT- GND Figure 2. Typical Connection Diagram for SD & FSD Mode 2.5V - 5V (Note 3) 1uF System Controller 10uF LFILT+ 0.1uF VBATT MODE SD Audio In+ AIN+ Audio In- AIN+ OUT+ OUT- GND Figure 3. Typical Connection Diagram for HD & FHD Mode Note: 3. The value of the capacitance connected to the LFILT+ net should not exceed 4.7 F.
PAGE 8
CS35L01/03 4. CHARACTERISTICS & SPECIFICATIONS Test Conditions (unless otherwise specified): GND = 0 V; All voltages with respect to ground; Input signal = 997 Hz differential sine wave; TA = 25°C; VBATT = 5.0 V; RL = 8 ; 22 Hz to 20 kHz measurement bandwidth; Measurements taken with AES17 measurement filter and Audio Precision AUX-0025 passive filter. RECOMMENDED OPERATING CONDITIONS GND = 0 V; All voltages with respect to ground. Please see (Note 4). Parameters Symbol Min Typ Max Units VBATT 2.
PAGE 9
CS35L01/03 ELECTRICAL CHARACTERISTICS - ALL OPERATIONAL MODES Parameters Min Typ ILFILT+ - 10 - A ZLFILT+ - 0.7 -  VBLIM - 3.0 - VDC CS35L03 CS35L01 - 0.015•VBATT 0.029•VBATT - Vrms Vrms Input Level for Entering VBATT Operation in CS35L03 V HD/FHD Modes (Note 9) IN-VBATT CS35L01 - 0.09 0.19 - Vrms Vrms Max.
PAGE 10
CS35L01/03 ELECTRICAL CHARACTERISTICS - SD MODE Parameters Symbol Output Power (Continuous Average) PO Test Conditions Min Typ Max Units THD+N = 1% RL = 8  (VBATT = 5.0/4.2/3.7 VDC) RL = 4 (VBATT = 5.0/4.2/3.7 VDC) - 1.39/0.98/0.76 2.41/1.69/1.30 - W W THD+N = 10% RL = 8  (VBATT = 5.0/4.2/3.7 VDC) RL = 4 (VBATT = 5.0/4.2/3.7 VDC) - 1.73/1.23/0.95 3.03/2.12/1.64 - W - 0.02 - % W Total Harmonic Distortion + Noise THD+N PO = 1.
PAGE 11
CS35L01/03 ELECTRICAL CHARACTERISTICS - FSD MODE Parameters Symbol Output Power (Continuous Average) PO Test Conditions Min Typ THD+N = 1% RL = 8  (VBATT = 5.0/4.2/3.7 VDC) RL = 4 (VBATT = 5.0/4.2/3.7 VDC) - 1.32/0.94/0.72 2.30/1.62/1.24 - W W THD+N = 10% RL = 8  (VBATT = 5.0/4.2/3.7 VDC) RL = 4 (VBATT = 5.0/4.2/3.7 VDC) - 1.70/1.21/0.94 2.94/2.08/1.61 - W - 0.10 - % Total Harmonic Distortion + Noise THD+N PO = 1.
PAGE 12
CS35L01/03 ELECTRICAL CHARACTERISTICS - HD MODE Parameters Symbol Output Power (Continuous Average) PO Test Conditions Min Typ THD+N = 1% RL = 8  (VBATT = 5.0/4.2/3.7 VDC) RL = 4 (VBATT = 5.0/4.2/3.7 VDC) - 1.39/0.99/0.76 2.41/1.69/1.30 - W W THD+N = 10% RL = 8  (VBATT = 5.0/4.2/3.7 VDC) RL = 4 (VBATT = 5.0/4.2/3.7 VDC) - 1.73/1.23/0.95 3.03/2.13/1.64 - W - 0.02 - % Total Harmonic Distortion + Noise THD+N PO = 1.
PAGE 13
CS35L01/03 ELECTRICAL CHARACTERISTICS - FHD MODE Parameters Symbol Output Power (Continuous Average) PO Test Conditions Min Typ THD+N = 1% RL = 8  (VBATT = 5.0/4.2/3.7 VDC) RL = 4 (VBATT = 5.0/4.2/3.7 VDC) - 1.33/0.94/0.72 2.31/1.63/1.23 - W W THD+N = 10% RL = 8  (VBATT = 5.0/4.2/3.7 VDC) RL = 4 (VBATT = 5.0/4.2/3.7 VDC) - 1.71/1.21/0.94 2.95/2.09/1.61 - W - 0.11 - % Total Harmonic Distortion + Noise THD+N PO = 1.
PAGE 14
CS35L01/03 DIGITAL INTERFACE SPECIFICATIONS AND CHARACTERISTICS Parameters Symbol Min Max Units Iin - ±10 A Input Capacitance - 10 pF SD Pulse Width Requirement 1 - ms Input Leakage Current Logic I/Os (Applicable to GAIN_SEL, MODE, and SD) High-Level Input Voltage VIH 0.7•VBATT - V Low-Level Input Voltage VIL - 0.
PAGE 15
CS35L01/03 5. APPLICATIONS 5.1 MODE Descriptions The CS35L01/03 devices can be operated in one of four operating modes, determined by the MODE pin and the LFILT+ pin. The four modes of operation are Standard Class-D operation (SD), Reduced Frequency Standard Class-D operation (FSD), Hybrid Class-D operation (HD), and Reduced Frequency Hybrid ClassD operation (FHD). Each of these modes can be leveraged to optimize different performance criteria in an array of applications.
PAGE 16
CS35L01/03 In both HD and FHD mode, the value of the capacitance connected to the LFILT+ pin must not exceed 4.7 F. If this value is greater than 4.7 F, it will prevent the rail voltage of the output devices from transitioning properly between VBATT and the internal LDO. 5.1.2.1 HD Mode Hybrid Class-D mode (HD) provides competitive analog performance with a substantial reduction in idle power dissipation and radiation emissions.
PAGE 17
CS35L01/03 AV = Original gain of the device being used (See “Electrical Characteristics - All Operational Modes” on page 9 for this value.) 5.3 Output Filtering with the CS35L01/03 The CS35L01/03 is specifically designed to minimize radiated electromagnetic interference (EMI) signals. All of the devices are capable of meeting all stated data sheet performance numbers with no special filtering required.
PAGE 18
CS35L01/03 5.3.3 Output Filter Power Dissipation Considerations In systems without inductive series elements like inductors or ferrite beads, power losses in the output filter are equal to the switching losses that occur in the system due to the cyclical charging and discharging of capacitors connected to the amplifier outputs. In systems that require an inductive series element, conducted losses also occurs due to the series impedance added to the output path. 5.3.3.
PAGE 19
CS35L01/03 It is important to note that the HD and FHD modes offer significant improvement over traditional Class-D in idle power dissipation when an external output filter is necessary. This is because the voltage term (V) is significantly reduced in HD and FHD mode. As can be seen in the equation, this is notable because reduction in the operating voltage reduces power losses not linearly, but instead exponentially- due to the voltage squared term (V2).
PAGE 20
CS35L01/03 5.5 Over Temperature Protection The CS35L01/03 is internally protected against thermal overload. Built in die temperature sensing circuitry monitors the die temperature and will place the device into shut-down if thermal overload occurs. A thermal overload is characterized by the die temperature reaching the Thermal Error Threshold (TTE) at which time the outputs will tristate and shut down.
PAGE 21
CS35L01/03 6. TYPICAL PERFORMANCE PLOTS Test Conditions (unless otherwise specified): GND = 0 V; All voltages with respect to ground; AV = 6 dB; Input signal = 997 Hz differential sine wave; TA = 25°C; VBATT = 5.0 V; RL = 8 ; 10 Hz to 20 kHz Measurement Bandwidth; Measurements taken with AES17 measurement filter and Audio Precision AUX-0025 passive filter. 6.1 SD Mode Typical Performance Plots 10 10 5 5 5.0 V 4.2 V 3.7 V 2 5.0 V 4.2 V 3.7 V 2 1 1 0.5 0.5 % % 0.2 0.2 0.1 0.1 0.05 0.05 0.
PAGE 22
CS35L01/03 3.5 7.00 6.00 3.0 5.00 2.5 Output Power (W) Idle Current Draw (mA) 2200 pF 4.00 1000 pF 3.00 RL = 4  10% THD+N Ratio 2.0 RL = 4  1% THD+N Ratio 1.5 2.00 1.0 1.00 0.5 RL = 8  10% THD+N Ratio RL = 8  1% THD+N Ratio 470 pF No Filter 0.00 0.0 2.5 3 3.5 4 4.5 5 5.5 2.5 3.0 3.5 VBATT Supply Voltage (V) Figure 14. Idle Current Draw vs. VBATT - SD Mode RL = 8  + 33 H (Note 16) 100% 90% 90% 80% 5.0 V 3.7 V 70% 60% 60% Efficiency (%) Efficiency (%) 5.0 5.
PAGE 23
CS35L01/03 6.2 FSD Mode Typical Performance Plots 10 10 5 5 5.0 V 4.2 V 3.7 V 2 5.0 V 4.2 V 3.7 V 2 1 1 0.5 0.5 % % 0.2 0.2 0.1 0.1 0.05 0.05 0.02 0.02 0.01 1m 2m 5m 10m 20m 50m 100m 200m 500m 1 0.01 1m 2 2m 5m 10m 20m 50m W Figure 20. THD+N vs. Output Power - FSD Mode RL = 8  10 5 5 1.0 W 2 % 500m 1 2 4 0.75 W 2 1 1 0.5 0.5 0.1 W 0.1 W 0.2 0.1 % 0.05 0.1 0.05 0.5 W 0.02 0.5 W 0.02 0.01 0.01 0.005 0.005 0.002 0.
PAGE 24
CS35L01/03 3.50 3.5 3.0 2.50 2.5 Output Power (W) Idle Current Draw (mA) 2200 pF 3.00 2.00 1000 pF 1.50 1.00 RL = 4  10% THD+N Ratio 2.0 RL = 4  1% THD+N Ratio 1.5 1.0 RL = 8  10% THD+N Ratio 470 pF No Filter 0.50 0.5 0.00 RL = 8  1% THD+N Ratio 0.0 2.5 3 3.5 4 4.5 5 5.5 2.5 3.0 3.5 VBATT Supply Voltage (V) Figure 26. Idle Current Draw vs. VBATT - FSD Mode RL = 8  + 33 H (Note 17) 100% 100% 90% 90% 5.0 5.5 80% 3.7 V 4.2 V 4.2 V 3.7 V 5.
PAGE 25
CS35L01/03 6.3 HD Mode Typical Performance Plots 10 10 5 5 5.0 V 4.2 V 3.7 V 2 5.0 V 4.2 V 3.7 V 2 1 1 0.5 0.5 % % 0.2 0.2 0.1 0.1 0.05 0.05 0.02 0.02 0.01 1m 2m 5m 10m 20m 50m 100m 200m 500m 1 0.01 1m 2 2m 5m 10m 20m 50m W 10 10 5 5 2 2 1 1 0.5 0.5 1.0 W 0.2 % 1 2 4 0.1 0.05 0.1 W 0.02 0.1 W 0.02 0.01 0.01 0.5 W 0.5 W 0.005 0.005 0.002 0.001 20 500m 0.75 W 0.2 0.1 0.05 200m Figure 33. THD+N vs.
PAGE 26
CS35L01/03 4.50 3.5 4.00 3.0 RL = 4  10% THD+N Ratio 3.50 2.5 2.50 1000 pF Output Power (W) Idle Current Draw (mA) 3.00 2200 pF 2.00 2.0 RL = 4  1% THD+N Ratio 1.5 1.50 1.0 RL = 8  10% THD+N Ratio 1.00 470 pF No Filter 0.5 RL = 8  1% THD+N Ratio 0.50 0.00 0.0 2.5 3 3.5 4 4.5 5 5.5 2.5 3.0 3.5 VBATT Supply Voltage (V) Figure 38. Idle Current Draw vs. VBATT - HD Mode RL = 8  + 33 H (Note 18) 5.0 5.5 100% 90% 90% 80% 80% 4.2 V 3.7 V 5.0 V 5.0 V 4.2 V 3.
PAGE 27
CS35L01/03 6.4 FHD Mode Typical Performance Plots 10 10 5 5 5.0 V 4.2 V 3.7 V 2 5.0 V 4.2 V 3.7 V 2 1 1 0.5 0.5 % % 0.2 0.2 0.1 0.1 0.05 0.05 0.02 0.02 0.01 1m 2m 5m 10m 20m 50m 100m 200m 500m 1 0.01 1m 2 2m 5m 10m 20m 50m W 100m Figure 44. THD+N vs. Output Power - FHD Mode RL = 8  2 4 5 1.0 W 2 2 1 1 0.5 0.5 0.1 W 0.2 0.75 W 0.1 W 0.2 0.1 % 0.05 0.1 0.05 0.5 W 0.5 W 0.02 0.02 0.01 0.01 0.005 0.005 0.002 0.
PAGE 28
CS35L01/03 4.50 3.5 4.00 3.0 RL = 4  10% THD+N Ratio 3.50 2.5 2.50 Output Power (W) Idle Current Draw (mA) 3.00 2200 pF 1000 pF 2.00 2.0 RL = 4  1% THD+N Ratio 1.5 1.50 1.0 RL = 8  10% THD+N Ratio 1.00 470 pF No Filter 0.50 0.5 0.00 2.5 3 3.5 4 4.5 5 RL = 8  1% THD+N Ratio 0.0 5.5 2.5 3.0 3.5 VBATT Supply Voltage (V) Figure 50. Idle Current Draw vs. VBATT - FHD Mode RL = 8  + 33 H (Note 19) 100% 90% 90% 80% 70% 60% 60% Efficiency (%) Efficiency (%) 5.0 5.
PAGE 29
CS35L01/03 7. PARAMETER DEFINITIONS Signal to Noise Ratio (SNR) The ratio of the RMS value of the output signal, where Pout is equivalent to the specified output power at THD+N<1%, to the RMS value of the noise floor with no input signal applied and measured over the specified bandwidth, typically 20 Hz to 20 kHz. This measurement technique has been accepted by the Electronic Industries Association of Japan, EIAJ CP-307. Expressed in decibels.
PAGE 30
CS35L01/03 8. PACKAGING AND THERMAL INFORMATION 8.1 Package Drawings and Dimensions (Note 20) 9 BALL WLCSP e Y e b 9 solder spheres X A2 A A1 DIM MIN X Y b e A A1 A2 0.047 0.047 0.009 0.018 0.006 0.012 INCHES NOM 0.048 0.048 0.011 0.015 0.020 0.007 0.013 NOTE MAX MIN MILLIMETERS NOM MAX 0.049 0.049 0.012 0.022 0.008 0.014 1.195 1.195 0.240 0.475 0.175 0.300 1.215 1.215 0.270 0.400 BSC 0.515 0.190 0.325 1.235 1.235 0.300 0.555 0.205 0.
PAGE 31
CS35L01/03 8.2 Recommend PCB Footprint and Routing Configuration To ensure high-yield manufacturability, the PCB footprint for the CS35L01/03 should be constructed with strict adherence to the specifications given in IPC-610. Departure from this specification significantly increases the probability of solder bridging and other manufacturing defects. Routing of the traces into and out of the CS35L01/03 device should also be given consideration to avoid manufacturing issues. 8.
PAGE 32
CS35L01/03 8.3.1 Determining Maximum Ambient Temperature To determine (to a first order approximation) the maximum ambient temperature in which the CS35L01/03 will operate, the following equations can be used: T op =  JA    1 –    P max  T max = T TE – T op Where: Tmax = The maximum ambient temperature in which the device can operate. Top = The operating temperature of the device, given a dissipated power “Pmax” and a known thermal impedance “JA”.
PAGE 33
CS35L01/03 9. ORDERING INFORMATION Product Description Package Pb-Free Grade Temp Range Container Order# CS35L01 3.0 W Mono Audio 9Yes Amplifier with default WLCSP +6 dB gain Commercial -10° to +70°C Tape and Reel CS35L01-CWZR CS35L03 3.0 W Mono Audio 9Yes Amplifier with default WLCSP +12 dB gain Commercial -10° to +70°C Tape and Reel CS35L03-CWZR 10.