IC Phoenix
 
Home ›  MM83 > MAX8884ZEREKE+T,700mA DC-DC Step-Down Converters with Dual 300mA LDO in 2mm x 2mm CSP
MAX8884ZEREKE+T Fast Delivery,Good Price
Part Number:
If you need More Quantity or Better Price,Welcom Any inquiry.
We available via phone +865332716050 Email
Partno Mfg Dc Qty AvailableDescript
MAX8884ZEREKE+TMAXN/a2740avai700mA DC-DC Step-Down Converters with Dual 300mA LDO in 2mm x 2mm CSP


MAX8884ZEREKE+T ,700mA DC-DC Step-Down Converters with Dual 300mA LDO in 2mm x 2mm CSPApplicationsMAX8884YEREKE+T 16 CSP 2MHzMAX8884ZEREKE+T 16 CSP 4MHzCell Phones/SmartphonesNote: All ..
MAX8885EUK25 ,150mA, Low-Dropout Linear Regulator with Power-OK OutputApplicationsPCS Phones ModemsPART TEMP. RANGE PIN-PACKAGEMAX8885EUK25 -40°C to +85°C 5 SOT23-5Cellu ..
MAX8885EUK25+ ,150mA, Low-Dropout Linear Regulator with Power OK OutputELECTRICAL CHARACTERISTICS(V = V + 1V, SHDN = I , T = -40°C to +85°C, unless otherwise noted. Typic ..
MAX8885EUK25+T ,150mA, Low-Dropout Linear Regulator with Power OK Outputfeatures a power-OK output that indicates♦ Thermal-Overload and Short-Circuit Protectionwhen the ou ..
MAX8885EUK27 ,150mA, Low-Dropout Linear Regulator with Power-OK OutputELECTRICAL CHARACTERISTICS(V = V + 1V, SHDN = I , T = -40°C to +85°C, unless otherwise noted. Typic ..
MAX8885EUK30+T ,150mA, Low-Dropout Linear Regulator with Power OK OutputApplicationsPCS Phones ModemsPART TEMP. RANGE PIN-PACKAGEMAX8885EUK25 -40°C to +85°C 5 SOT23-5Cellu ..
MB87L2250 ,MPEG2 Transport / Video and Audio Decoder with integrated 32-Bit RISC CPUapplications. MPEG decoding and transport demultiplexing are imple-mented in hardware. The on-chip ..
MB87L2250 ,MPEG2 Transport / Video and Audio Decoder with integrated 32-Bit RISC CPUProduct ProfileOctober 1998Edition 1.1MB87L2250 - MPEG2 Transport, Video andAudio Decoder with inte ..
MB87L2250 ,MPEG2 Transport / Video and Audio Decoder with integrated 32-Bit RISC CPUFEATURES• RISC CPU integrated (32-bit)Pin Assignment • 1 KByte I-Cache• 2.5 Frame Architecture• Onl ..
MB88101A ,A/D Converter (With 4-channel Input at 12-bit Resolution)FEATURES• 4-channel analog input• One analog input channel selectable for conversion by external co ..
MB88101A ,A/D Converter (With 4-channel Input at 12-bit Resolution)FUJITSU SEMICONDUCTORDS04-13105-2EDATA SHEETLinear IC ConverterCMOSA/D Converter(With 4-channel I ..
MB88101APF ,A/D Converter (With 4-channel Input at 12-bit Resolution)FEATURES• 4-channel analog input• One analog input channel selectable for conversion by external co ..


MAX8884ZEREKE+T
700mA DC-DC Step-Down Converters with Dual 300mA LDO in 2mm x 2mm CSP
General Description
The MAX8884Y/MAX8884Z step-down converters with
dual low-dropout (LDO) linear regulators are intended to
power low-voltage microprocessors, DSPs, camera and
Wi-Fi modules, or other point of load applications in
portable devices. These ICs feature high efficiency with
small external component size. The step-down converter
output voltage is pin selectable between 1.2V and 1.8V,
and provides guaranteed output current of 700mA. The
2/4MHz hysteretic-PWM control scheme allows for tiny
external components and reduces no-load operating
current to 50µA. Two low quiescent current, low-noise
LDOs operate down to 2.7V supply voltage. Two switch-
ing frequency options are available—MAX8884Y (2MHz)
and MAX8884Z (4MHz)—allowing optimization for small-
est 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
MAX8884Y/MAX8884Z have individual enables for each
output, maximizing flexibility.
The MAX8884Y/MAX8884Z are available in a 16-bump,
2mm x 2mm CSP package (0.7mm max height).
Applications

Cell Phones/Smartphones
PDA and Palmtop Computers
Portable MP3 and DVD Players
Digital Cameras, Camcorders
PCMCIA Cards
Handheld Instruments
Features
Step-Down Converter
Pin-Selectable Output Voltage (1.2V/1.8V)
2MHz or 4MHz Switching Frequency
Low-Output Voltage Ripple
700mA Output Drive Capability
Simple Logic ON/OFF Control
Tiny External Components
Low-Noise LDOs
2 x 300mA LDO
Pin-Selectable Output Voltage (LDO1)
Low 26µVRMS(typ) Output Noise
High 65dB (typ) PSRR
Simple Logic ON/OFF Control
Low 0.1µA Shutdown Current2.7V to 5.5V Supply Voltage RangeThermal ShutdownTiny, 2mm x 2mm x 0.65mm CSP Package (4x4 Grid)
MAX8884Y/MAX8884Z
700mA DC-DC Step-Down Converters
with Dual 300mA LDO in 2mm x 2mm CSP

19-4418; Rev 1; 1/10
EVALUATION KIT
AVAILABLE
Typical Application Circuit appears at end of data sheet.

AGNDPGNDREFBPNC1
BUCK_ENLXLDO2LDO2_EN
MAX8884Y
MAX8884Z
SELIN1AIN2IN1B
LDO1_ENFBLDO1NC2
TOP VIEW
(BUMPS ON BOTTOM)A2A3A4B2B3B4C2C3C4D2D3D4
CSP
Pin Configuration

IN1A
2.2μH
AGND
BUCK_EN
LDO1_EN
LDO2_EN
IN2
BATT
2.7V TO 5.5V
BATT
2.7V TO 5.5V
BUCK ON/OFF
BUCK
1.2V/1.8V
REFBP
IN1B
LDO1 ON/OFF
LDO2 ON/OFF
LDO2
LDO1
VLDO2
UP TO 300mA
VLDO1
UP TO 300mA
PGND
SEL
2.2μF
2.2μF
BUCK/LDO1 VOLTAGE
SELECTION
MAX8884Y
MAX8884Z
Typical Operating Circuit
Ordering Information
PARTPIN-PACKAGESWITCHING
FREQUENCY
MAX8884YEREKE+T
16 CSP2MHz
MAX8884ZEREKE+T
16 CSP4MHz
Note:
All devices are specified over the -40°C to +85°C operat-
ing temperature range.
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
MAX8884Y/MAX8884Z
700mA DC-DC Step-Down Converters
with Dual 300mA LDO in 2mm x 2mm CSP
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS

(VIN1A= VIN1B= VIN2= VLDO1_EN= VLDO2_EN= VBUCK_EN= 3.6V. 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, REFBP to AGND........................-0.3V to +6.0V
FB to PGND...........................................................-0.3V to +6.0V
SEL, BUCK_EN to AGND...............-0.3V to (VIN1A/VIN1B+ 0.3V)
LDO1, LDO2, LDO1_EN, LDO2_EN
to AGND.................................................-0.3V to (VIN2+ 0.3V)
IN2 to IN1A, IN1B..................................................-0.3V to +0.3V
AGND to PGND.....................................................-0.3V to +0.3V
IN1A, IN1B, LX Current.....................................................1ARMS
Continuous Power Dissipation (TA= +70°C)
16-Bump CSP (derate 12.5mW/°C above +70°C)..............1W
Operating Temperature.......................................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Bump Temperature*.........................................................+260°C
PARAMETERCONDITIONSMINTYPMAXUNITS
INPUT SUPPLY

Input Voltage VIN1A, VIN1B, VIN2 2.7 5.5 V
Input Undervoltage Threshold VIN1A, VIN1B, VIN2 rising, 180mV typical hysteresis 2.52 2.63 2.70 V = +25°C 0.1 4 Shutdown Supply Current VBUCK_EN = VLDO1_EN =
VLDO2_EN = 0 TA= +85°C 0.1 µA
VBUCK_EN = 0, ILDO1 = ILDO2 = 0A 140 230 µA No-Load Supply Current VLDO1_EN = VLDO2_EN = 0, IBUCK = 0A, no switching 50 80 µA
THERMAL PROTECTION

Thermal Shutdown TA rising, 20°C typical hysteresis +160 °C
LOGIC CONTROL

Logic Input-High Voltage
(BUCK_EN, SEL, LDO1_EN,
LDO2_EN)
2.7V  VIN1A = VIN1B = VIN2 5.5V 1.3 V
Logic Input-Low Voltage
(BUCK_EN, SEL, LDO1_EN,
LDO2_EN)
2.7V  VIN1A = VIN1B = VIN2 5.5V 0.4 V
TA = +25°C 0.01 1 Logic Input Current (BUCK_EN,
SEL, LDO1_EN, LDO2_EN) VIL = 0 or VIH= VIN1A = 5.5V TA = +85°C 0.1 µA
SEL = AGND, IBUCK = 0A 1.18 1.22 1.24 V Buck Converter Output Voltage VSEL = VIN1A, IBUCK = 0A 1.78 1.80 1.85 V
TA = +25°C 0.01 1 FB Leakage Current VIN1A = VIN1B = VIN2 = 5.5V,
VFB = 0 TA = +85°C 1 µA
LX

p-channel MOSFET switch, ILX = -40mA 0.18 0.30 On-Resistance n-channel MOSFET rectifier, ILX = 40mA 0.15 0.25
*These ICs are constructed using a unique set of packaging techniques imposing a limit on the thermal profile used during board level
solder attach and rework. This limit permits only the use of the solder profiles recommended 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.
MAX8884Y/MAX8884Z
700mA DC-DC Step-Down Converters
with Dual 300mA LDO in 2mm x 2mm CSP
PARAMETERCONDITIONSMINTYPMAXUNITS
= +25°C 0.1 1 LX Leakage Current VIN1A = VIN1B = VIN2 = 5.5V,
VLX = 0 TA= +85°C 1 µA
p-Channel MOSFET Peak Current
Limit VLX = 0 0.8 1.0 1.2 A
n-Channel MOSFET Valley
Current Limit 0.6 0.8 1.0 A
MAX8884Y_ 40 n-Channel MOSFET
Zero-Crossing Threshold MAX8884Z_ 60 mA
Minimum On-Time 0.07 µs
Minimum Off-Time 0.06 µs
Power-Up Delay From VBUCK_EN rising to VLX rising 120 250 µs
LDO1, LDO2

SEL = AGND 1.764 1.800 1.836 Output Voltage VLDO1VIN2 = 5.5V, ILDO_ = 1mA;
VIN2 = 3.4V, ILDO_ = 100mA SEL = IN1_ 2.800
Output Voltage VLDO2VIN2 = 5.5V, ILDO_ = 1mA;
VIN2 = 3.4V, ILDO_ = 100mA 2.770 2.800 2.830 V
Output Current 300 mA
Current Limit VLDO_ = 0 310 450 750 mA
Dropout Voltage ILDO_ = 100mA, TA= +25°C (VLDO_ 2.5V) 70 200 mV
Line Regulation VIN2 stepped from 3.5V to 5.5V, ILDO_ = 100mA 2.4 mV
Load Regulation ILDO_ stepped from 50µA to 200mA 25 mV
Power-Supply Rejection
VLDO_/VIN2
10Hz to 100kHz, VLDO_ = 1.8V,
CLDO_ = 2.2µF, ILDO_ = 30mA 65 dB
Output Noise 10Hz to 100kHz, VLDO_ = 1.8V,
CLDO_ = 2.2µF, ILDO_ = 30mA 26 µVRMS
0 < ILDO_ < 10mA 0.1
10mA < ILDO_ < 200mA 1 Output Capacitor for Stable
Operation
200mA < ILDO_ < 300mA 2.2
Shutdown Output Impedance VLDO1_EN = VLDO2_EN = 0 100 
Power-Up Delay From VLDO_EN rising to VLDO_ output rising 150 250 µs
REFBP

REFBP Output Voltage 0  IREFBP 1µA 1.237 1.250 1.263 V
REFBP Supply Rejection VIN2 stepped from 2.55V to 5.5V 0.2 5 mV
ELECTRICAL CHARACTERISTICS (continued)

(VIN1A= VIN1B= VIN2= VLDO1_EN= VLDO2_EN= VBUCK_EN= 3.6V. TA= -40°C to +85°C, typical values are at TA= +25°C, unless
otherwise noted.) (Note 1)
Note 1:
All devices are 100% production tested at TA= +25°C. Limits over the operating temperature range are guaranteed by
design.
MAX8884Y/MAX8884Z
700mA DC-DC Step-Down Converters
with Dual 300mA LDO in 2mm x 2mm CSP
STEP-DOWN CONVERTER EFFICIENCY
vs. LOAD CURRENT, VOUT = 1.8V

MAX8884Y/Z toc01
LOAD CURRENT (mA)
EFFICIENCY (%)
MAX8884Y, VIN = 3.2V
= 3.6V
= 4.2V
MAX8884Z, VIN = 3.2V
= 3.6V
= 4.2V
STEP-DOWN CONVERTER EFFICIENCY
vs. LOAD CURRENT, VOUT = 1.2V

MAX8884Y/Z toc02
LOAD CURRENT (mA)
EFFICIENCY (%)
MAX8884Y, VIN = 3.2V
= 3.6V
= 4.2V
MAX8884Z, VIN = 3.2V
= 3.6V
= 4.2V
STEP-DOWN CONVERTER NO-LOAD
SUPPLY CURRENT vs. INPUT VOLTAGE

MAX8884Y/Z toc03
INPUT VOLTAGE (V)
SUPPLY CURRENT (4321
VBUCK_EN = VIN
VLDO1_EN = VLDO2_EN = 0
VIN FALLING
VIN RISING
MAX8884Y
MAX8884Z
STEP-DOWN OUTPUT VOLTAGE vs. LOAD
CURRENT (VOLTAGE POSITIONING)

MAX8884Y/Z toc04
LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)
SEL = IN1_
SEL = AGND
MAX8884Z STEP-DOWN CONVERTER
LIGHT LOAD SWITCHING WAVEFORMS

MAX8884Y/Z toc05
400ns/div
ILX
VOUT
VLX
2V/div
100mA/div
AC-COUPLED
20mV/div
MAX8884Y STEP-DOWN CONVERTER
LIGHT LOAD SWITCHING WAVEFORMS

MAX8884Y/Z toc06
1μs/div
ILX
VOUT
VLX
2V/div
100mA/div
AC-COUPLED
10mV/div
ILOAD = 50mA
MAX8884Z STEP-DOWN CONVERTER
HEAVY LOAD SWITCHING WAVEFORMS

MAX8884Y/Z toc07
200ns/div
ILX
VOUT
VLX
2V/div
500mA/div
AC-COUPLED
10mV/div
ILOAD = 500mA
MAX8884Y STEP-DOWN CONVERTER
HEAVY LOAD SWITCHING WAVEFORMS

MAX8884Y/Z toc08
400ns/div
ILX
VOUT
VLX
2V/div
500mA/div
AC-COUPLED
10mV/div
ILOAD = 500mA
Typical Operating Characteristics

(VIN= VIN1A= VIN1B= VIN2= 3.6V, VBUCK= 1.2V, VLDO1= 1.8V, VLDO2= 2.8V, MAX8884YEVKIT, TA= +25°C, unless otherwise noted.)
MAX8884Y/MAX8884Z
700mA DC-DC Step-Down Converters
with Dual 300mA LDO in 2mm x 2mm CSP
MAX8884Z STEP-DOWN CONVERTER
LINE TRANSIENT RESPONSE

MAX8884Y/Z toc12
10μs/div
ILX
VIN
VOUT
1V/div
200mA/div
AC-COUPLED
20mV/div
ILOAD = 500mA4V
3.5V
MAX8884Y STEP-DOWN CONVERTER
LOAD TRANSIENT

MAX8884Y/Z toc14
20μs/div
ILX
VOUT
IOUT
1.8V DC OFFSET
100mV/div
500mA/div
500mA/div
500mA
10mA10mA
Typical Operating Characteristics (continued)

(VIN= VIN1A= VIN1B= VIN2= 3.6V, VBUCK= 1.2V, VLDO1= 1.8V, VLDO2= 2.8V, MAX8884YEVKIT, TA= +25°C, unless otherwise noted.)
MAX8884Y STEP-DOWN CONVERTER
LINE TRANSIENT RESPONSE

MAX8884Y/Z toc11
10µs/div
ILX
VIN
VOUT
1V/div
200mA/div
AC-COUPLED
20mV/div
ILOAD = 500mA
3.5V4V
MAX8884Z STEP-DOWN CONVERTER
LOAD TRANSIENT

MAX8884Y/Z toc13
20μs/div
VOUT
ILX
IOUT
500mA/div
500mA/div
1.8V DC OFFSET
100mV/div
10mA10mA
500mA
MAX8884Y STEP-DOWN CONVERTER
SOFT-START WAVEFORMS

MAX8884Y/Z toc10
40µs/div
ILX
IIN1
VOUT
VBUCK_EN
2V/div
500mA/div
200mA/div
1V/div
ILOAD = 500mA
MAX8884Z STEP-DOWN CONVERTER
SOFT-START WAVEFORMS

MAX8884Y/Z toc09
40μs/div
IIN1
VOUT
ILX
VBUCK_EN
2V/div
500mA/div
200mA/div
1V/divILOAD = 500mA
MAX8884Y/MAX8884Z
700mA DC-DC Step-Down Converters
with Dual 300mA LDO in 2mm x 2mm CSP
Typical Operating Characteristics (continued)

(VIN= VIN1A= VIN1B= VIN2= 3.6V, VBUCK= 1.2V, VLDO1= 1.8V, VLDO2= 2.8V, MAX8884YEVKIT, TA= +25°C, unless otherwise noted.)
LDO POWER SUPPLY
RIPPLE REJECTION, VOUT = 1.8V

MAX8884Y/Z toc18
FREQUENCY (kHz)
RIPPLE REJECTION (dB)
ILDO = 30mA
LDO OUTPUT VOLTAGE
NOISE WAVEFORM, VOUT_ = 1.8V

MAX8884Y/Z toc20
400µs/div
MAX8884Y/MAX8884Z
LDO1 = 1.8 AT 30mA
VIN = 3.6V
50µV/div
VN = 26.1µVRMS,
f = 100Hz to 100kHz, ILDO_ = 30mA
LDO2 DROPOUT VOLTAGE
vs. LOAD CURRENT

MAX8884Y/Z toc17
LOAD CURRENT (mA)
DROPOUT VOLTAGE (V)
LDO POWER SUPPLY
RIPPLE REJECTION, VOUT = 2.8V
MAX8884Y/Z toc19
FREQUENCY (kHz)
RIPPLE REJECTION (dB)
ILDO_ = 30mA
LDO1, LDO2 INPUT SUPPLY CURRENT
vs. INPUT VOLTAGE

MAX8884Y/Z toc16
INPUT VOLTAGE (V)
SUPPLY CURRENT (4321
VLDO1_EN = VLDO2_EN = VIN,
VBUCK_EN = 0
MAX8884Y STEP-DOWN CONVERTER
SHUTDOWN WAVEFORMS

MAX8884Y/Z toc15
10μs/div
ILX
VOUT
VBUCK_EN
1V/div
5V/div
500mA/div
ILOAD = 500mA
MAX8884Y/MAX8884Z
700mA DC-DC Step-Down Converters
with Dual 300mA LDO in 2mm x 2mm CSP
Typical Operating Characteristics (continued)

(VIN= VIN1A= VIN1B= VIN2= 3.6V, VBUCK= 1.2V, VLDO1= 1.8V, VLDO2= 2.8V, MAX8884YEVKIT, TA= +25°C, unless otherwise noted.)
LDO1, LDO2 LOAD TRANSIENT RESPONSE

MAX8884Y/Z toc24
20μs/div
ILDO1
VLDO2
ILDO2
VLDO1AC-COUPLED
10mV/div
AC-COUPLED
10mV/div
50mA/div
50mA/div
1mA1mA
1mA1mA
40mA
40mA
LDO1, LDO2 LINE TRANSIENT

MAX8884Y/Z toc23
10μs/div
VLDO1
VIN
VLDO2AC-COUPLED
5mV/div
AC-COUPLED
5mV/div
1V/div
ILDO1 = ILDO2 = 100mA4V
3.5V
LDO OUTPUT-NOISE SPECTRAL DENSITY
vs. FREQUENCY, VLDO_ = 2.8V

MAX884Y/Z toc22
FREQUENCY (kHz)
10,000
ILDO_ = 30mA
NOISE DENSITY (nV
(Hz))
LDO OUTPUT-NOISE SPECTRAL DENSITY
vs. FREQUENCY, VLDO_ = 1.8V

MAX884Y/Z toc21
FREQUENCY (kHz)
NOISE DENSITY (nV
(Hz))
10,000
ILDO_ = 30mA
LDO1, LDO2 STARTUP
AND SHUTDOWN RESPONSE

MAX8884Y/Z toc26
400μs/div
VLDO1
VLDO1_EN =
VLDO2_EN
VLDO22V/div
2V/div
2V/div
LDO1, LDO2 LOAD TRANSIENT
RESPONSE NEAR DROPOUT

MAX8884Y/Z toc25
20μs/div
ILDO1
VLDO2
ILDO2
VLDO1
AC-COUPLED
10mV/div
AC-COUPLED
10mV/div
50mA/div
50mA/div
1mA1mA
40mA
1mA1mA
40mA
VIN2 = VLDO2 + 200mV
MAX8884Y/MAX8884Z
700mA DC-DC Step-Down Converters
with Dual 300mA LDO in 2mm x 2mm CSP
REFBP SOFT-START
CREFBP = 0.15μF

MAX8884Y/Z toc28
100μs/div
VLDO1_EN
VREFBP
VLDO11V/div
2V/div
1V/div
REFBP SOFT-START
CREFBP = 0.033µF

MAX8884Y/Z toc27
100µs/div
VLDO1_EN
VREFBP
VLDO11V/div
2V/div
1V/div
MAX8884Y SWITCHING FREQUENCY
vs. OUTPUT CURRENT (VOUT = 1.2V)

MAX8884Y/Z toc30
LOAD CURRENT (mA)
SWITCHING FREQUENCY (MHz)
VIN = 4.2V
VIN = 3.6V
VIN = 3V
CIN = COUT = 2.2µF, L = 2.2µH
MAX8884Y SWITCHING FREQUENCY
vs. OUTPUT CURRENT (VOUT = 1.8V)

MAX8884Y/Z toc29
LOAD CURRENT (mA)
SWITCHING FREQUENCY (MHz)
VIN = 4.2V
VIN = 3.6V
VIN = 3V
CIN = COUT = 2.2µF, L = 2.2µH
MAX8884Z SWITCHING FREQUENCY
vs. OUTPUT CURRENT (VOUT = 1.2V)

MAX8884Y/Z toc32
LOAD CURRENT (mA)
SWITCHING FREQUENCY (MHz)
CIN = COUT = 2.2µF, L = 2.2µH
VIN = 3.6V
VIN = 3V
VIN = 4.2V
MAX8884Z SWITCHING FREQUENCY
vs. OUTPUT CURRENT (VOUT = 1.8V)

MAX8884Y/Z toc31
SWITCHING FREQUENCY (MHz)
VIN = 4.2V
VIN = 3.6V
VIN = 3V
CIN = COUT = 2.2µF, L = 2.2µH
Typical Operating Characteristics (continued)

(VIN= VIN1A= VIN1B= VIN2= 3.6V, VBUCK= 1.2V, VLDO1= 1.8V, VLDO2= 2.8V, MAX8884YEVKIT, TA= +25°C, unless otherwise noted.)
MAX8884Y/MAX8884Z
700mA DC-DC Step-Down Converters
with Dual 300mA LDO in 2mm x 2mm CSP
Detailed Description

The MAX8884Y/MAX8884Z are designed to power the
subcircuits within a system. These ICs contain a high-
frequency, high-efficiency step-down converter and two
LDOs. The step-down converter delivers 700mA with
either 1.2V or 1.8V selectable output voltage using SEL.
The hysteretic PWM control scheme provides extremely
fast transient response, while 2MHz and 4MHz switch-
ing frequency options allow the trade-off between effi-
ciency and the smallest external components. The
MAX8884Y/MAX8884Z linear regulators can be used to
power loads requiring a low output noise supply.
Step-Down Converter Control Scheme

A hysteretic PWM control scheme ensures high efficien-
cy, fast switching, fast transient response, low-output
voltage ripple, and physically tiny external components.
The control scheme is simple: when the output voltage
is below the regulation threshold, the error comparator
begins a switching cycle by turning on the high-side
switch. This high-side switch remains on until the mini-
mum on-time expires and output voltage is within regu-
lation, or the inductor current is above the current-limit
threshold. Once off, the high-side switch remains off
until the minimum off-time expires and the output volt-
age falls again below the regulation threshold. During
Pin Description
PINNAMEFUNCTION
REFBPReference Noise Bypass. Bypass REFBP to AGND with a 0.033µF ceramic capacitor to reduce noise
on the LDO outputs. REFBP is internally pulled to ground through a 1kΩ resistor during shutdown.AGNDLow-Noise Analog Ground. Connect to common ground plane.NC1No Internal Connection. Connect NC1 to ground.PGNDPower Ground for Step-Down Converter. Connect to common ground plane.LDO2
300mA LDO Regulator 2 Output. For 300mA application, bypass LDO2 with a 2.2µF ceramic capacitor
as close as possible to LDO2 and AGND. For low-output current capability, up to 10mA, an output
capacitor of 0.1µF is sufficient to keep the output voltage stable. LDO2 is internally pulled to ground
through a 100Ω resistor when this regulator is disabled.BUCK_ENStep-Down Converter Enable Input. Connect BUCK_EN to IN1_ or logic-high for normal operation.
Connect BUCK_EN to AGND or logic-low for step-down shutdown mode.LDO2_ENLDO2 Enable Input. Connect LDO2_EN to IN2 or logic-high for normal operation. Connect LDO2_EN to
AGND or logic-low for LDO2 shutdown mode.LXInductor Connection. Connect an inductor from LX to the output of the 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 4.7µF ceramic capacitor as close as possible to IN2 and
AGND. Connect IN2 to the same source as IN1A and IN1B.SELOutput Voltage Selection for LDO1 and Step-Down Converter. Connect to IN1_ or AGND for output
voltage selection. See Table 1.
C3, C4IN1B, IN1A
Supply Voltage Input for Step-Down Converter. Connect IN1B and IN1A to a battery or supply voltage
from 2.7V to 5.5V. Bypass the connection of IN1B and IN1A with a 2.2µF ceramic capacitor as close as
possible to IN1B, IN1A, and PGND. IN1A and IN1B are internally connected together. Connect IN1A
and IN1B to the same source as IN2.LDO1
300mA LDO Regulator 1 Output. For 300mA application, bypass LDO1 with a 2.2µF ceramic capacitor
as close as possible to LDO1 and AGND. For low-output current capability, up to 10mA, an output
capacitor of 0.1µF is sufficient to keep output voltage stable. LDO1 is internally pulled to AGND
through a 100Ω resistor when this regulator is disabled.LDO1_ENLDO1 Enable Input. Connect LDO1_EN to IN2 or logic-high for normal operation. Connect LDO1_EN to
AGND or logic-low for LDO1 shutdown mode.NC2No Internal Connection. Connect NC2 to ground.FBFB is Connected to the Internal Feedback Network
ic,good price


TEL:86-533-2716050      FAX:86-533-2716790
   

©2020 IC PHOENIX CO.,LIMITED