MAX8805WEREEE+C8Z Fast Delivery |IC PHOENIX CO.,LIMITED

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MAX8805WEREEE+C8Z
600mA/650mA PWM Step-Down Converters in 2mm x 2mm WLP for WCDMA PA Power
General Description
The MAX8805W/MAX8805X/MAX8805Y/MAX8805Z
high-frequency step-down converters are optimized for
dynamically powering the power amplifier (PA) in
WCDMA or NCDMA handsets. The devices integrate a
high-efficiency PWM step-down converter for medium-
and low-power transmission, and a 60mΩtypical
bypass FET to power the PA directly from the battery
during high-power transmission. Dual 200mA low-noise,
high-PSRR low-dropout regulators (LDOs) for PA bias-
ing are also integrated.
Two switching frequency options are available (2MHz for
the MAX8805W/MAX8805Y and 4MHz for the MAX8805X/
MAX8805Z), allowing optimization for smallest solution
size or highest efficiency. Fast switching allows the use of
small ceramic 2.2µF input and output capacitors while
maintaining low ripple voltage. The feedback network is
integrated, further reducing external component count
and total solution size.
The MAX8805W/MAX8805X/MAX8805Y/MAX8805Z use
an analog input driven by an external DAC to control
the output voltage linearly for continuous PA power
adjustment. The REFIN to OUT gain is available in two
options (2V/V for the MAX8805Y/MAX8805Z and 2.5V/V
for the MAX8805W/MAX8805X). At high-duty cycle, the
MAX8805W/MAX8805X/MAX8805Y/MAX8805Z auto-
matically switch to the bypass mode, connecting the
input to the output through a low-impedance (60mΩ
typ) MOSFET. The user can also enable the bypass
mode directly through a logic-control input.
The LDOs in the MAX8805W/MAX8805X/MAX8805Y/
MAX8805Z are designed for low-noise operation
(35µVRMS typ). Each LDO is individually enabled
through its own logic control interface.
The MAX8805W/MAX8805X/MAX8805Y/MAX8805Z are
available in 16-bump, 2mm x 2mm WLP and UCSP™
packages (0.7mm max height).
FeaturesPA Step-Down Converter
7.5µs (typ) Settling Time for 0.8V to 3.4V Output
Voltage Change
Dynamic Output Voltage Setting from 0.4V to
VBATT
60mΩpFET and 100% Duty Cycle for Low
Dropout
2MHz or 4MHz Switching Frequency
Low Output-Voltage Ripple
600mA (MAX8805Y/MAX8805Z) or 650mA
(MAX8805W/MAX8805X) Output Drive
Capability
2% Gain Accuracy
Tiny External ComponentsDual Low-Noise LDOs
Low 35µVRMS(typ) Output Noise
High 70dB (typ) PSRR
Guaranteed 200mA Output Drive Capability
Individual ON/OFF ControlLow 0.1µA Shutdown Current2.7V to 5.5V Supply Voltage RangeThermal ShutdownTiny 2mm x 2mm x 0.7mm WLP and UCSP
Packages (4 x 4 Grid)
MAX8805W/MAX8805X/MAX8805Y/MAX8805Z
600mA/650mA PWM Step-Down Converters in
2mm x 2mm WLP for WCDMA PA Power
Ordering Information
19-0777; Rev 5; 2/10
+Denotes a lead-free/RoHS-compliant package.
T = Tape and reel.
*xy is the output voltage code (see Table 1).
Note:All devices are specified over the -40°C to +85°C operating temperature range.
Pin Configuration appears at end of data sheet.
EVALUATION KIT
AVAILABLE
PARTPIN-PACKAGESWITCHING FREQUENCYREFIN TO OUT GAIN
MAX8805WERExy+T*16 UCSP2MHz2.5V/V
MAX8805XERExy+T*16 UCSP4MHz2.5V/V
MAX8805YERExy+T*16 UCSP2MHz2V/V
MAX8805ZERExy+T*16 UCSP4MHz2V/V
Applications
WCDMA/NCDMA Cellular Handsets
Wireless PDAs
Smartphones
UCSP is a trademark of Maxim Integrated Products, Inc.
MAX8805W/MAX8805X/MAX8805Y/MAX8805Z
600mA/650mA PWM Step-Down Converters in
2mm x 2mm WLP for WCDMA PA Power
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VIN1A= VIN1B= VIN2= VPA_EN= VEN1= VEN2= 3.6V, VHP= 0V, VREFIN= 0.9V (MAX8805Y/MAX8805Z), VREFIN= 0.72V
(MAX8805W/MAX8805X), TA= -40°C to +85°C. Typical values are at TA=+25°C, unless otherwise noted.) (Note 1)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
IN1A, IN1B, IN2, REFIN, EN2, REFBP to AGND...-0.3V to +6.0V
PAA, PAB, PA_EN, HP to AGND....-0.3V to (VIN1A/VIN1B+ 0.3V)
LDO1, LDO2, EN1 to AGND......................-0.3V to (VIN2+ 0.3V)
IN2 to IN1B/IN1A...................................................-0.3V to +0.3V
PGND to AGND.....................................................-0.3V to +0.3V
LX Current......................................................................0.7ARMS
IN1A/IN1B and PAA/PAB Current.....................................2ARMS
PAA and PAB Short Circuit to PGND or IN1_.............Continuous
Continuous Power Dissipation (TA= +70°C)
16-Bump UCSP (derate 12.5mW/°C above +70°C)..........1W
16-Bump WLP (derate 12.5mW/°C above +70°C).............1W
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Bump Temperature (soldering, reflow)............................+260°C
PARAMETERCONDITIONSMINTYPMAXUNITS
INPUT SUPPLY
Input VoltageVIN1A, VIN1B, VIN22.75.5V
Input Undervoltage ThresholdVIN1A, VIN1B, VIN2 rising, 180mV typical hysteresis2.522.632.70V
TA = +25°C0.14Shutdown Supply CurrentVPA_EN = VEN1 = VEN2 = 0VTA = +85°C0.1µA
VPA_EN = 0V, ILDO1 = ILDO2 = 0mA150250
MAX8805W/MAX8805Y3500VEN1 = VEN2 = 0V, IPA = 0mA,
switchingMAX8805X/MAX8805Z5000No-Load Supply Current
VEN1 = VEN2 = 0V, VHP = 3.6V150
THERMAL PROTECTION
Thermal ShutdownTA rising, 20°C typical hysteresis+160°C
LOGIC CONTROL
PA_EN, EN1, EN2, HP Logic-
Input High Voltage2.7V ≤ VIN1A = VIN1B = VIN2 ≤ 5.5V1.4V
PA_EN, EN1, EN2, HP Logic-
Input Low Voltage2.7V ≤ VIN1A = VIN1B = VIN2 ≤ 5.5V0.4V
TA = +25°C0.011Logic-Input Current
(PA_EN, EN1, EN2, HP)VIL = 0V or VIH = VIN1A = 5.5VTA = +85°C0.1µA
REFIN
MAX8805Y/MAX8805Z0.12.2REFIN Common-Mode RangeMAX8805W/MAX8805X0.11.76V
VREFIN = 0.4V, 0.9V, 1.7V,
2.2V (ILX = 0mA)MAX8805Y/MAX8805Z1.962.002.04
REFIN to PA_ Gain
VREFIN = 0.32V, 0.75V,
1.32V, 1.76V (ILX = 0mA)MAX8805W/MAX8805X2.452.502.55
V/V
MAX8805Y/MAX8805Z540REFIN Input ResistancekΩ
Note:This device is constructed using a unique set of packaging techniques that impose a limit on the thermal profile the device
can be exposed to during board level solder attach and rework. This limit permits only the use of the solder profiles recom-
mended in the industry-standard specification, JEDEC 020A, paragraph 7.6, Table 3 for IR/VPR and Convection reflow.
Preheating is required. Hand or wave soldering is not allowed.
MAX8805W/MAX8805X/MAX8805Y/MAX8805Z
600mA/650mA PWM Step-Down Converters in
2mm x 2mm WLP for WCDMA PA Power
PARAMETERCONDITIONSMINTYPMAXUNITS
MAX8805Y/MAX8805Z0.44 x
VIN2
0.465 x
VIN2
0.48 x
VIN2REFIN
Dual Mode™ ThresholdVREFIN rising, 50mV hysteresis
MAX8805W/MAX8805X0.36 x
VIN2
0.372 x
VIN2
0.39 x
VIN2
p-channel MOSFET switch, ILX = -40mA0.180.6On-Resistancen-channel MOSFET rectifier, ILX = 40mA0.150.6Ω
TA = +25°C0.15LX Leakage CurrentVIN1A = VIN1B = VIN2 = 5.5V,
VLX = 0VTA = +85°C1µA
MAX8805Y/MAX8805Z0.70.91.1Peak Current Limit
(p-Channel MOSFET)VLX = 0VMAX8805W/MAX8805X0.750.951.15A
MAX8805Y/MAX8805Z0.50.70.9Valley Current Limit
(n-Channel MOSFET)MAX8805W/MAX8805X0.550.750.95A
MAX8805Y/MAX8805Z0.1Minimum On- and Off-TimesMAX8805W/MAX8805X0.07µs
Power-Up DelayFrom PA_EN rising to LX rising150250µs
BYPASS
TA = +25°C0.0600.1On-Resistancep-channel MOSFET bypass,
IOUT = -90mATA = +85°C0.1Ω
Bypass Current LimitVPA_ = 0V0.81.21.8A
MAX8805Y/MAX8805Z0.70.91.1S tep - D ow n C ur r ent Li m i t i n Byp assVLX = 0VMAX8805W/MAX8805X0.750.951.15A
MAX8805Y/MAX8805Z1.52.12.9Total Bypass Current LimitVLX = VPA_ = 0VMAX8805W/MAX8805X1.552.152.95A
TA = +25°C0.0110Bypass Off-Leakage CurrentVIN1A = VIN1B = VIN2 = 5.5V,
VPAA = VPAB = 0VTA = +85°C1µA
LDO1
MAX8805_E_EAA+T1.7461.81.854
MAX8805_E_EBC+T2.4252.52.575
MAX8805_E_ECC+T2.6192.72.781
MAX8805_E_EDD+T2.7162.82.884
MAX8805_E_EEE+T2.7652.852.936
Output Voltage VLDO1VIN2 = 5.5V, ILDO1 = 1mA;
VIN2 = 3.4V, ILDO1 = 100mA
MAX8805_E_EGG+T2.9103.03.090
Output Current200mA
Current LimitVLDO1 = 0V250550750mA
Dropout VoltageILDO1 = 100mA, TA = +25°C (VLDO1 ≥ 2.5V)70200mV
Line RegulationVIN2 stepped from 3.5V to 5.5V, ILDO1 = 100mA2.4mV
Load RegulationILDO1 stepped from 50µA to 200mA25mV
Power-Supply Rejection10Hz to 10kHz, CLDO1 = 1µF, ILDO1 = 30mA70dB
ELECTRICAL CHARACTERISTICS (continued)
(VIN1A= VIN1B= VIN2= VPA_EN= VEN1= VEN2= 3.6V, VHP= 0V, VREFIN= 0.9V (MAX8805Y/MAX8805Z), VREFIN= 0.72V
(MAX8805W/MAX8805X), TA= -40°C to +85°C. Typical values are at TA=+25°C, unless otherwise noted.) (Note 1)
MAX8805W/MAX8805X/MAX8805Y/MAX8805Z
600mA/650mA PWM Step-Down Converters in
2mm x 2mm WLP for WCDMA PA Power
ELECTRICAL CHARACTERISTICS (continued)
(VIN1A= VIN1B= VIN2= VPA_EN= VEN1= VEN2= 3.6V, VHP= 0V, VREFIN= 0.9V (MAX8805Y/MAX8805Z), VREFIN= 0.72V
(MAX8805W/MAX8805X), TA= -40°C to +85°C. Typical values are at TA=+25°C, unless otherwise noted.) (Note 1)
PARAMETERCONDITIONSMINTYPMAXUNITS
Output Noise100Hz to 100kHz, CLDO1 = 1µF, ILDO1 = 30mA35µVRMS
0 < ILDO1 < 10mA100nFOutput Capacitor for Stable
Operation0 < ILDO1 < 200mA1µF
Shutdown Output ImpedanceVEN1 = 0V1kΩ
LDO2
MAX8805_E_EAA+T1.7461.81.854
MAX8805_E_EAC+T2.6192.72.781
MAX8805_E_EAD+T2.7162.82.884
MAX8805_E_EBE+T2.7652.852.936
Output Voltage VLDO2VIN2 = 5.5V, ILDO2 = 1mA;
VIN2 = 3.4V, ILDO2 = 100mA
MAX8805_E_EGG+T2.9103.03.090
Output Current200mA
Current LimitVLDO2 = 0V250550750mA
Dropout VoltageILDO2 = 100mA, TA = +25°C70200mV
Line RegulationVIN2 stepped from 3.5V to 5.5V, ILDO2 = 100mA2.4mV
Load RegulationILDO2 stepped from 50µA to 200mA25mV
Power-Supply Rejection
∆VLDO2 / ∆VIN210Hz to 10kHz, CLDO2 = 1µF, ILDO2 = 30mA70dB
Output Noise100Hz to 100kHz, CLDO2 = 1µF, ILDO2 = 30mA35µVRMS
0µA < ILDO2 < 10mA100nFOutput Capacitor for Stable
Operation0µA < ILDO2 < 200mA1µF
Shutdown Output ImpedanceVEN2 = 0V1kΩ
REFBP
REFBP Output Voltage0 ≤ IREFBP ≤ 1µA1.2371.2501.263V
REFBP Supply RejectionVIN2 stepped from 2.55V to 5.5V0.25mV
Note 1:All devices are 100% production tested at TA= +25°C. Limits over the operating temperature range are guaranteed by design.
MAX8805W/MAX8805X/MAX8805Y/MAX8805Z
600mA/650mA PWM Step-Down Converters in
2mm x 2mm WLP for WCDMA PA Power
Typical Operating Characteristics
(VIN1A= VIN1B= VIN2= 3.6V, VPA_= 1.2V, VLDO1= 2.85V, VLDO2= 2.85V, RPA= 7.5Ω, circuit of Figure 5, TA= +25°C, unless oth-
erwise noted.)
BYPASS MODE DROPOUT VOLTAGE
vs. PA LOAD CURRENT
MAX8805W/X/Y/Z toc01
PA LOAD CURRENT (A)
BYPASS MODE DROPOUT VOLTAGE (mV)
VIN1 = 3.2V
VIN1 = 3.6V
PA STEP-DOWN CONVERTER EFFICIENCY
vs. OUTPUT VOLTAGE (MAX8805X/MAX8805Z)
MAX8805W/X/Y/Z toc02
OUTPUT VOLTAGE (V)
EFFICIENCY (%)
BYPASS MODE
VIN1 = 4.2V
VIN1 = 3.6V
VIN1 = 3.2V
RPA = 7.5Ω
PA STEP-DOWN CONVERTER EFFICIENCY
vs. OUTPUT VOLTAGE (MAX8805W/MAX8805Y)
MAX8805W/X/Y/Z toc03
OUTPUT VOLTAGE (V)
EFFICIENCY (%)
BYPASS MODE
VIN1 = 4.2V
VIN1 = 3.6V
VIN1 = 3.2V
RPA = 7.5Ω
PA STEP-DOWN CONVERTER EFFICIENCY
vs. OUTPUT VOLTAGE (MAX8805X/MAX8805Z)
MAX8805W/X/Y/Z toc04
OUTPUT VOLTAGE (V)
EFFICIENCY (%)
BYPASS MODE
VIN1 = 4.2V
VIN1 = 3.6V
VIN1 = 3.2V
RPA = 10Ω
PA STEP-DOWN CONVERTER EFFICIENCY
vs. OUTPUT VOLTAGE (MAX8805W/MAX8805Y)
MAX8805W/X/Y/Z toc05
OUTPUT VOLTAGE (V)
EFFICIENCY (%)
BYPASS MODE
VIN1 = 4.2V
VIN1 = 3.6V
VIN1 = 3.2V
RPA = 10Ω
PA STEP-DOWN CONVERTER EFFICIENCY
vs. LOAD CURRENT (MAX8805X/MAX8805Z)
MAX8805W/X/Y/Z toc06
LOAD CURRENT (mA)
EFFICIENCY (%)
VIN1 = 3.2V
VPA_ = 1.8V
VIN1 = 3.6VVIN1 = 4.2V
PA STEP-DOWN CONVERTER EFFICIENCY
vs. LOAD CURRENT (MAX8805W/MAX8805Y)
MAX8805W/X/Y/Z toc07
LOAD CURRENT (mA)
EFFICIENCY (%)
VIN1 = 3.2V
VPA_ = 1.8V
VIN1 = 3.6V
VIN1 = 4.2V
PA STEP-DOWN CONVERTER EFFICIENCY
vs. LOAD CURRENT (MAX8805X/MAX8805Z)
MAX8805W/X/Y/Z toc08
LOAD CURRENT (mA)
EFFICIENCY (%)VIN1 = 3.2V
VPA_ = 1.2V
VIN1 = 3.6V
VIN1 = 4.2V
PA STEP-DOWN CONVERTER EFFICIENCY
vs. LOAD CURRENT (MAX8805W/MAX8805Y)
MAX8805W/X/Y/Z toc09
LOAD CURRENT (mA)
EFFICIENCY (%)
VIN1 = 3.2V
VPA_ = 1.2V
VIN1 = 3.6V
VIN1 = 4.2V
MAX8805W/MAX8805X/MAX8805Y/MAX8805Z
600mA/650mA PWM Step-Down Converters in
2mm x 2mm WLP for WCDMA PA Power
Typical Operating Characteristics (continued)
(VIN1A= VIN1B= VIN2= 3.6V, VPA_= 1.2V, VLDO1= 2.85V, VLDO2= 2.85V, RPA= 7.5Ω, circuit of Figure 5, TA= +25°C, unless oth-
erwise noted.)
PA STEP-DOWN CONVERTER EFFICIENCY
vs. LOAD CURRENT (MAX8805X/MAX8805Z)
MAX8805W/X/Y/Z toc10
LOAD CURRENT (mA)
EFFICIENCY (%)
VIN1 = 3.2V
VPA_ = 0.6V
VIN1 = 3.6V
VIN1 = 4.2V
PA STEP-DOWN CONVERTER EFFICIENCY
vs. LOAD CURRENT (MAX8805W/MAX8805Y)
MAX8805W/X/Y/Z toc11
LOAD CURRENT (mA)
EFFICIENCY (%)VIN1 = 3.2V
VPA_ = 0.6V
VIN1 = 3.6V
VIN1 = 4.2V
PA STEP-DOWN CONVERTER OUTPUT
VOLTAGEvs. LOAD CURRENT
MAX8805W/X/Y/Z toc12
LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)
MAX8805X/MAX8805Z
MAX8805W/MAX8805Y
PA STEP-DOWN CONVERTER OUTPUT
VOLTAGE vs. REFIN VOLTAGE
MAX8805Y/Z toc13
REFIN VOLTAGE (V)
OUTPUT VOLTAGE (V)
MAX8805X/MAX8805W
MAX8805Y/MAX8805Z
REFIN vs. REFIN TO OUT GAIN (MAX8805Z)
MAX8805Y/Z toc14
OUTPUT VOLTAGE ERROR (mV)
VIN1 = 3.2V, NO LOAD
VIN1 = 4.2V, NO LOAD
REFIN vs. REFIN TO OUT GAIN (MAX8805Y)
MAX8805Y/Z toc15
OUTPUT VOLTAGE ERROR (mV)
VIN1 = 3.2V, NO LOAD
VIN1 = 4.2V, NO LOAD
REFIN vs. REFIN TO OUT GAIN (MAX8805X)
MAX8805W/X/Y/Z toc16
REFIN VOLTAGE (V)
OUTPUT VOLTAGE ERROR (mV)
VIN1 = 3.2V, NO LOAD
VIN1 = 4.2V, NO LOAD
REFIN vs. REFIN TO OUT GAIN (MAX8805W)
MAX8805W/X/Y/Z toc17
REFIN VOLTAGE (V)
OUTPUT VOLTAGE ERROR (mV)
VIN1 = 3.2V, NO LOAD
VIN1 = 4.2V, NO LOAD
400ns/div
PA STEP-DOWN CONVERTER LIGHT-LOAD
SWITCHING WAVEFORMS (MAX8805X/MAX8805Z)
VPA_
AC-COUPLED
ILX200mA/div
20mV/div
2V/div
MAX8805W/X/Y/Z toc18
VLX
VPA_ = 1.2V, IPA_ = 50mA
MAX8805W/MAX8805X/MAX8805Y/MAX8805Z
600mA/650mA PWM Step-Down Converters in
2mm x 2mm WLP for WCDMA PA Power
400ns/div
PA STEP-DOWN CONVERTER LIGHT-LOAD
SWITCHING WAVEFORMS (MAX8805W/MAX8805Y)
VPA_
AC-COUPLED
ILX200mA/div
20mV/div
2V/div
MAX8805W/X/Y/Z toc19
VLX
VPA_ = 1.2V, IPA_ = 50mA
400ns/div
PA STEP-DOWN HEAVY-LOAD
SWITCHING WAVEFORMS (MAX8805X/MAX8805Z)
VPA_
AC-COUPLED
ILX500mA/div
20mV/div
2V/div
MAX8805W/X/Y/Z toc20
VLX
VPA_ = 1.2V, IPA_ = 500mA
400ns/div
PA STEP-DOWN HEAVY-LOAD
SWITCHING WAVEFORMS (MAX8805W/MAX8805Y)
VPA_
AC-COUPLED
ILX500mA/div
20mV/div
2V/div
MAX8805W/X/Y/Z toc21
VLX
VPA_ = 1.2V, IPA_ = 500mA
Typical Operating Characteristics (continued)
(VIN1A= VIN1B= VIN2= 3.6V, VPA_= 1.2V, VLDO1= 2.85V, VLDO2= 2.85V, RPA= 7.5Ω, circuit of Figure 5, TA= +25°C, unless oth-
erwise noted.)
MAX8805W/MAX8805X/MAX8805Y/MAX8805Z
600mA/650mA PWM Step-Down Converters in
2mm x 2mm WLP for WCDMA PA Power
Typical Operating Characteristics (continued)
(VIN1A= VIN1B= VIN2= 3.6V, VPA_= 1.2V, VLDO1= 2.85V, VLDO2= 2.85V, RPA= 7.5Ω, circuit of Figure 5, TA= +25°C, unless oth-
erwise noted.)
10μs/div
PA STEP-DOWN CONVERTER LOAD
TRANSIENT RESPONSE (MAX8805X/MAX8805Z)
IPA_
ILX500mA/div
500mA/div
100mV/div
MAX8805W/X/Y/Z toc26
VPA_
AC-COUPLED
0mA
500mA
0mA
10μs/div
PA STEP-DOWN CONVERTER LOAD
TRANSIENT RESPONSE (MAX8805W/MAX8805Y)
IPA_
ILX500mA/div
500mA/div
100mV/div
MAX8805W/X/Y/Z toc27
VPA_
AC-COUPLED
0mA
500mA
0mA
10μs/div
PA STEP-DOWN CONVERTER LINE
TRANSIENT RESPONSE (MAX8805W/MAX8805Y)
VIN1_
VPA_
AC-COUPLED50mV/div
500mV/div
200mA/div
MAX8805W/X/Y/Z toc25
ILX
4.0V
3.5V
4.0V
10μs/div
PA STEP-DOWN CONVERTER LINE
TRANSIENT RESPONSE (MAX8805X/MAX8805Z)
VIN1_
VPA_
AC-COUPLED50mV/div
500mV/div
200mA/div
MAX8805W/X/Y/Z toc24
ILX
4.0V
3.5V
4.0V
20μs/div
PA STEP-DOWN SOFT-START
WAVEFORMS (MAX8805X/MAX8805Z)
VPA_EN
VPA_1V/div
2V/div
500mA/div
MAX8805W/X/Y/Z toc22
ILX
20μs/div
PA STEP-DOWN SOFT-START
WAVEFORMS (MAX8805W/MAX8805Y)
VPA_EN
VPA_1V/div
2V/div
200mA/div
MAX8805W/X/Y/Z toc23
ILX
MAX8805W/MAX8805X/MAX8805Y/MAX8805Z
600mA/650mA PWM Step-Down Converters in
2mm x 2mm WLP for WCDMA PA Power
10μs/div
PA STEP-DOWN CONVERTER OUTPUT
VOLTAGE TRANSIENT RESPONSE
(MAX8805Y/MAX8805Z)
VREFIN
VPA_500mV/div
500mV/div
500mA/div
MAX8805W/X/Y/Z toc28
ILX
0.5V
0.5V
20μs/div
PA STEP-DOWN CONVERTER FORCED
BYPASS-FET TRANSIENT RESPONSE
(MAX8805Y/MAX8805Z)
VHP
VPA_2V/div
2V/div
500mA/div
MAX8805W/X/Y/Z toc29
ILX
1.5V0V
1.2V1.2V
3.6V
10μs/div
PA STEP-DOWN CONVERTER OUTPUT
VOLTAGE TRANSIENT RESPONSE
(MAX8805W/MAX8805X)
VREFIN
VPA_500mV/div
500mV/div
500mA/div
MAX8805W/X/Y/Z toc30
ILX
1.25V
0.66V0.66V
20μs/div
PA STEP-DOWN CONVERTER
BYPASS-FET TRANSIENT RESPONSE
(MAX8805W/MAX8805X)
VHP
VPA_2V/div
2V/div
500mA/div
MAX8805W/X/Y/Z toc31
ILX
3.6V
1.2V
1.2V
10μs/div
PA STEP-DOWN CONVERTER AUTOMATIC
BYPASS-FET TRANSIENT RESPONSE
(MAX8805Y/MAX8805Z)
VREFIN
VPA_2V/div
1V/div
500mA/div
MAX8805W/X/Y/Z toc32
ILX
1.8V
0.6V0.6V
1.2V1.2V
3.6V
200μs/div
PA STEP-DOWN CONVERTER AUTOMATIC
BYPASS-FET TRANSIENT RESPONSE
(MAX8805Y/MAX8805Z)
VREFIN
VPA_
1V/div
1V/div
500mA/div
MAX8805W/X/Y/Z toc33
ILX
VREFIN IS A 0.4V TO
2V SINUSOIDAL
SIGNAL
3.6V
Typical Operating Characteristics (continued)
(VIN1A= VIN1B= VIN2= 3.6V, VPA_= 1.2V, VLDO1= 2.85V, VLDO2= 2.85V, RPA= 7.5Ω, circuit of Figure 5, TA= +25°C, unless oth-
erwise noted.)
MAX8805W/MAX8805X/MAX8805Y/MAX8805Z
600mA/650mA PWM Step-Down Converters in
2mm x 2mm WLP for WCDMA PA Power
LDO1, LDO2 SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX8805W/X/Y/Z toc38
SUPPLY VOLTAGE (V)
NO-LOAD SUPPLY CURRENT (
LDO1, LDO2 DROPOUT VOLTAGE
vs. LOAD CURRENT
MAX8805W/X/Y/Z toc39
LDO1, LDO2 DROPOUT VOLTAGE (mV)
10μs/div
PA STEP-DOWN CONVERTER SHUTDOWN
RESPONSE (MAX8805X/MAX8805Z)
VPA_EN
VPA_
2V/div
2V/div
100mA/div
MAX8805W/X/Y/Z toc37
ILX
1.2V
10μs/div
PA STEP-DOWN CONVERTER AUTOMATIC
BYPASS-FET TRANSIENT RESPONSE
(MAX8805W/MAX8805X)
VREFIN
VPA_2V/div
1V/div
500mA/div
MAX8805W/X/Y/Z toc34
ILX
1.2V
0.48V
3.6V
1.44V
0.48V
1.2V
200μs/div
PA STEP-DOWN CONVERTER
AUTOMATIC BYPASS-FET TRANSIENT
RESPONSE (MAX8805W/MAX8805X)
VREFIN
VPA_1V/div
1V/div
500mA/div
MAX8805W/X/Y/Z toc35
ILX
3.6V
VREFIN IS A 0.48V TO
2.1V SINSOIDAL
SIGNAL
10μs/div
PA STEP-DOWN CONVERTER SHUTDOWN
RESPONSE (MAX8805W/MAX8805Y)
VPA_EN
VPA_
1V/div
2V/div
100mA/div
MAX8805W/X/Y/Z toc36
ILX
1.2V
Typical Operating Characteristics (continued)
(VIN1A= VIN1B= VIN2= 3.6V, VPA_= 1.2V, VLDO1= 2.85V, VLDO2= 2.85V, RPA= 7.5Ω, circuit of Figure 5, TA= +25°C, unless oth-
erwise noted.)
MAX8805W/MAX8805X/MAX8805Y/MAX8805Z
600mA/650mA PWM Step-Down Converters in
2mm x 2mm WLP for WCDMA PA Power
LDO PSRR vs. FREQUENCY
MAX8805W/X/Y/Z toc40
FREQUENCY (kHz)
PSRR (dB)
ILDO_ = 30mA
LDO OUTPUT NOISE SPECTRAL DENSITY
vs. FREQUENCY
MAX8805W/X/Y/Z toc41
FREQUENCY (kHz)
OUTPUT NOISE DENSITY (nV/
Hz)
1.0E+02
1.0E+03
1.0E+04
1.0E+01
400μs/div
LDO1, LDO2 OUTPUT NOISE WAVEFORM
50mV/div
MAX8805W/X/Y/Z toc42
20μs/div
LDO LINE TRANSIENT RESPONSE
500mV/div
MAX8805W/X/Y/Z toc43
4.0V4.0V
3.5V
ILDO_ = 80mA
5mV/div
VIN2
VLDO_
20μs/div
LDO1, LDO2 LOAD TRANSIENT
RESPONSE NEAR DROPOUT
100mA/div
50mV/div
100mA/div
MAX8805W/X/Y/Z toc44
0mA
80mA
VIN2 = VLDO1,2 + 200mV
50mV/div
ILDO1
VLDO1
ILDO2
VLDO2
0mA
0mA0mA
80mA
1ms/div
LDO1, LDO2 TURN ON AND
SHUTDOWN RESPONSE
2V/div
2V/div
2V/div
MAX8805W/X/Y/Z toc45
VEN1,2
VLDO1
VLDO2
Typical Operating Characteristics (continued)
(VIN1A= VIN1B= VIN2= 3.6V, VPA_= 1.2V, VLDO1= 2.85V, VLDO2= 2.85V, RPA= 7.5Ω, circuit of Figure 5, TA= +25°C, unless oth-
erwise noted.)
MAX8805W/MAX8805X/MAX8805Y/MAX8805Z
600mA/650mA PWM Step-Down Converters in
2mm x 2mm WLP for WCDMA PA Power
Pin Description
PINNAMEFUNCTIONREFBPReference Noise Bypass. Bypass REFBP to AGND with a 0.22µF ceramic capacitor to reduce noise on the
LDO outputs. REFBP is internally pulled down through a 1kΩ resistor during shutdown.AGNDLow-Noise Analog GroundREFIN
DAC-Controlled Input. The output of the PA step-down converter is regulated to 2 x VREFIN for the
MAX8805Y/MAX8805Z and 2.5 x VREFIN for the MAX8805W/MAX8805X. When VREFIN reaches 0.465 x VIN2
for the MAX8805Y/MAX8805Z and 0.372 x VIN2 for the MAX8805W/MAX8805X, bypass mode is enabled.PGNDPower Ground for PA Step-Down ConverterLDO2200mA LDO Regulator 2 Output. Bypass LDO2 with a 1µF ceramic capacitor as close as possible to LDO2
and AGND. LDO2 is internally pulled down through a 1kΩ resistor when this regulator is disabled.PA_ENPA Step-Down Converter Enable Input. Connect to IN_ or logic-high for normal operation. Connect to GND
or logic-low for shutdown mode.EN2LDO2 Enable Input. Connect to IN2 or logic-high for normal operation. Connect to AGND or logic-low for
shutdown mode.LXInductor Connection. Connect an inductor from LX to the output of the PA step-down converter.IN2
Supply Voltage Input for LDO1, LDO2, and Internal Reference. Connect IN2 to a battery or supply voltage
from 2.7V to 5.5V. Bypass IN2 with a 2.2µF ceramic capacitor as close as possible to IN2 and AGND.
Connect IN2 to the same source as IN1A and IN1B.HP
High-Power Mode Set Input. Drive HP high to invoke forced bypass mode. Bypass mode connects the
input of the PA step-down converter directly to its output through the internal bypass MOSFET. Drive HP
low to disable the forced bypass mode.
C3, C4IN1B,
IN1A
Supply Voltage Input for PA Step-Down Converter. Connect IN1_ to a battery or supply voltage from 2.7V to
5.5V. Bypass the connection of IN1_ with a 2.2µF ceramic capacitor as close as possible to IN1_, and
PGND. IN1A and IN1B are internally connected together. Connect IN1_ to the same source as IN2.LDO1200mA LDO Regulator 1 Output. Bypass LDO1 with a 1µF ceramic capacitor as close as possible to LDO1
and AGND. LDO1 is internally pulled down through a 1kΩ resistor when this regulator is disabled.EN1LDO1 Enable Input. Connect to IN2 or logic-high for normal operation. Connect to AGND or logic-low for
shutdown mode.
D3, D4PAB, PAA
PA Connection for Bypass Mode. Internally connected to IN1_ using the internal bypass MOSFET during
bypass mode. PA_ is connected to the internal feedback network. Bypass PA_ with a 2.2µF ceramic
capacitor as close as possible to PA_ and PGND.

Partno	Mfg	Dc	Qty	Available	Descript
MAX8805WEREEE+C8Z	MAX	N/a	12500	avai	600mA/650mA PWM Step-Down Converters in 2mm x 2mm WLP for WCDMA PA Power