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MAX8901AETA+T |MAX8901AETATMAXIMN/a5834avaiHighest Efficiency Supply for 2 to 6 Series WLEDs in a 2mm x 2mm TDFN Package
MAX8901BETA+TMAXN/a680avaiHighest Efficiency Supply for 2 to 6 Series WLEDs in a 2mm x 2mm TDFN Package


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MAX8901AETA+T-MAX8901BETA+T
Highest Efficiency Supply for 2 to 6 Series WLEDs in a 2mm x 2mm TDFN Package
MAX8901A/MAX8901BHighest Efficiency Supply
for 2 to 6 Series WLEDs in a
2mm x 2mm TDFN Package

EVALUATION KIT AVAILABLE
General Description

The MAX8901A/MAX8901B step-up converters drive
from two to six series-connected white LEDs (WLEDs)
with constant current to provide uniform WLED intensity
for LCD backlighting in cell phones, PDAs, and other
handheld devices. The MAX8901_ operate at a fixed
750kHz (typ) switching frequency, allowing for tiny exter-
nal components, and are optimized for the highest possi-
ble efficiency over the full 1-cell Li+/Li-Poly battery range.
These converters use a single input (ON) to enable the
IC and to control WLED intensity. The MAX8901A
requires a direct PWM input to regulate WLED intensity
with the WLED current proportional to the PWM duty
cycle. The MAX8901B uses single-wire, serial-pulse
dimming that reduces the WLED intensity in 32 linear
steps. Full-scale WLED current for serial-pulse
dimming is 24.75mA (MAX8901B, 0.75mA/step).
The MAX8901_ feature an internal soft-start to eliminate
inrush currents during startup, input overvoltage
protection, WLED overvoltage protection, and a shut-
down mode with 0.01µA (typ) shutdown current. No
WLED current is present in shutdown provided the
WLED forward voltage is greater than the input supply
voltage. Additional features include undervoltage lock-
out (UVLO) and thermal shutdown.
The MAX8901_ are available in tiny 8-pin, 2mm x 2mm
TDFN-EP packages (0.8mm max height).
Applications

Display Backlight (from 2 to 6 WLEDs)
Cellular Phones
PDAs and Smartphones
MP3 and Portable Media Players
Portable Navigation Devices
Digital Cameras
Benefits and Features
Cost-Effective and Flexible Solution for Wide Range of
Backlighting ApplicationsSupplies from 2 to 6 WLEDs with 1.3% LED Current
Accuracy2.6V to 5.5V Input Voltage RangeFixed-Frequency OperationFlexible Dimming ControlDirect PWM Dimming (MAX8901A)32-Step, Single-Wire Serial Dimming (MAX8901B)Protection Features Improve System ReliabilityWLED Overvoltage Protection (25V typ)Internal Soft-Start and Thermal ShutdownInput Undervoltage LockoutInput Overvoltage LockoutHigh Efficiency Extends Battery LifeUp to 91% Efficiency0.01µA (typ) Shutdown CurrentNo WLED Current in Shutdown8-Pin, 2mm x 2mm TDFN Package Saves Space
Ordering Information

MAX8901A
COMP
GND
OVP
PGND
OUTPUT
UP TO 25V42
INPUT
2.6V TO 5.5V
PWM DIMMING
CONTROL
Typical Operating Circuits
Note:
All devices are specified over the -40°C to +85°C operating
temperature range.
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
T = Tape and reel.
PARTPIN-PACKAGETOP MARK
MAX8901AETA+T
8 TDFN-EP*
2mm x 2mm+ABA
MAX8901BETA+T
8 TDFN-EP*
2mm x 2mm+ABB
MAX8901B
COMP
GND
OVP
PGND
OUTPUT
UP TO 25V42
INPUT
2.6V TO 5.5V
SERIAL-PULSE
DIMMING
CONTROL
Pin Configuration appears at end of data sheet.
MAX8901A/MAX8901BHighest Efficiency Supply
for 2 to 6 Series WLEDs in a
2mm x 2mm TDFN Package
Absolute Maximum Ratings
Electrical Characteristics

(VIN= VON= VOVP= 3.6V, VPGND= VGND= 0V, COMP, CS, and LX are unconnected, TA= -40°C to +85°C, unless otherwise noted.
Typical values are at TA= +25°C.) (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.
IN to GND.................................................................-0.3V to +7V
CS, COMP, ON to GND...............................-0.3V to (VIN+ 0.3V)
OVP, LX to GND.....................................................-0.3V to +28V
PGND to GND.......................................................-0.3V to +0.3V
LX Current..................................................................770mARMS
Continuous Power Dissipation (multilayer board at +70°C)
8-pin, 2mm x 2mm TDFN
(derate above +70°C by 11.9mW/°C)..........................953mW
Operating Temperature Range...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
Soldering Temperature (reflow).......................................+260°C
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS

Input VoltageVIN2.65.5V
VIN rising2.252.55Input Undervoltage Lockout
ThresholdVIN_UVLO
VIN falling2.53
VIN rising6.26.35Input Overvoltage Lockout
ThresholdVIN_OVLOVIN falling6.06.3V
TA = +25°C0.011Shutdown Input CurrentISHDNVON = 0VTA = +85°C0.1µA
MAX8901A70135Quiescent CurrentIQVCS = 0.55V, no load
(not switching)MAX8901B115185µA
Output Voltage RangeVOUTVDIODE = external boost diode voltage dropVIN -
VDIODEVOVV
OVP Overvoltage Protection
ThresholdVOV6 LEDs with 25V OVP option242526V
OVP Input CurrentIOVVOVP = 20V20µA
CS Regulation VoltageVCSNo dimming0.4750.500.525V
ON Shutdown DelaytSHDNTime VON is below low threshold until
shutdown (Figure 1)1.181.331.50ms
ON High VoltageVON_HI2.6V < VIN < 5.5V1.3V
ON Low VoltageVON_LO2.6V < VIN < 5.5V0.4V
TA = +25°C0.011ON Input CurrentIONON = INTA = +85°C0.1µA
Initial ON High Pulse WidthtHI_INITFirst ON high pulse to enable IC
(MAX8901B) (Figure 1)40µs
ON High Pulse WidthtHIMAX8901B (Figure 1)0.5µs
ON Low Pulse WidthtLOMAX8901B (Figure 1)0.5500.0µs
MAX8901A/MAX8901BHighest Efficiency Supply
for 2 to 6 Series WLEDs in a
2mm x 2mm TDFN Package
Note 1:
Specifications to -40°C are guaranteed by design and characterization and are not production tested.
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS

TA = +25°C-1.3+1.3%Serial Dimming
Full-Scale LED Current Accuracy
ILED = 24.75mA
(MAX8901B)TA = -40°C to +85°C-3+3%
PWM Frequency for PWM
Dimming ControlfPWMMAX8901A100kHz
CS to COMP Transconductance406080µS
Soft-Start IntervaltSOFT-
STARTCCOMP = 0.022µF (Figure 1)10ms
Thermal Shutdown160°C
OSCILLATOR

Operating FrequencyfSW700750800kHz
Maximum Duty CycleDMAXVCS = 0.4V9092%
n-CHANNEL SWITCH

TA = +25°C0.15LX Leakage CurrentILXLKGVLX = 27VTA = +85°C0.1µA
n-Channel Switch On-ResistanceRLX0.71.4Ω
n-Channel Current LimitILIM0.630.700.77A
Electrical Characteristics (continued)

(VIN= VON= VOVP= 3.6V, VPGND= VGND= 0V, COMP, CS, and LX are unconnected, TA= -40°C to +85°C, unless otherwise noted.
Typical values are at TA= +25°C.) (Note 1)023452829303132
SHUTDOWN
tSHDN
1.33ms (typ)
2/331/333/334/335/336/33
28/3329/3330/3331/3332/3332/33
SHUTDOWN
FULLFULL
ILED_
tSOFT-START
tHI_INIT
tLO
tHI
> 40µs
> 500ns500ns TO 500µs
STEP33
Figure 1. MAX8901B Timing Diagram
MAX8901A/MAX8901BHighest Efficiency Supply
for 2 to 6 Series WLEDs in a
2mm x 2mm TDFN Package
Typical Operating Characteristics

(Circuit of Figure 5, ILED= 24.75mA, VIN= VON= 3.6V, C1 = 1µF, C2 = 1µF, TA= +25°C, unless otherwise noted.)356
LED EFFICIENCY vs. INPUT VOLTAGE

MAX8901A/B toc01
INPUT VOLTAGE (V)
EFFICIENCY (%)
4 WLEDs
6 WLEDs
3 WLEDs
INDUCTOR: TOKO 1069AS-220M
DIODE: CENTRAL SEMI CMDSH05-4356
LED EFFICIENCY vs. INPUT VOLTAGE

MAX8901A/B toc02
INPUT VOLTAGE (V)
EFFICIENCY (%)
4 WLEDs
6 WLEDs
3 WLEDs
INDUCTOR: TOKO 1098AS-100M
DIODE: NXP PMEG3005EB510152025
LED EFFICIENCY vs. LED CURRENT
(6 WLEDs)

MAX8901A/B toc03
LED CURRENT (mA)
EFFICIENCY (%)
VIN = 5VVIN = 5.5V
VIN = 3.6V
VIN = 4.2V
VIN = 3V
INDUCTOR: TOKO 1069AS-220M
DIODE: CENTRAL SEMI CMDSH05-4510152025
LED EFFICIENCY vs. LED CURRENT
(6 WLEDs)

MAX8901A/B toc04
LED CURRENT (mA)
EFFICIENCY (%)
VIN = 5VVIN = 5.5V
VIN = 3.6V
VIN = 4.2V
VIN = 3V
INDUCTOR: TOKO 1098AS-100M
DIODE: NXP PMEG3005EB510152025
LED EFFICIENCY vs. LED CURRENT
(4 WLEDs)

MAX8901A/B toc05
LED CURRENT (mA)
EFFICIENCY (%)
VIN = 5VVIN = 5.5V
VIN = 3.6V
VIN = 4.2V
VIN = 3V
INDUCTOR: TOKO 1069AS-220M
DIODE: CENTRAL SEMI CMDSH05-4510152025
LED EFFICIENCY vs. LED CURRENT
(4 WLEDs)

MAX8901A/B toc06
LED CURRENT (mA)
EFFICIENCY (%)
VIN = 5VVIN = 5.5V
VIN = 3.6VVIN = 4.2V
VIN = 3V
INDUCTOR: TOKO 1098AS-100M
DIODE: NXP PMEG3005EB
MAX8901A/MAX8901BHighest Efficiency Supply
for 2 to 6 Series WLEDs in a
2mm x 2mm TDFN Package
Typical Operating Characteristics (continued)

(Circuit of Figure 5, ILED= 24.75mA, VIN= VON= 3.6V, C1 = 1µF, C2 = 1µF, TA= +25°C, unless otherwise noted.)
LED AND BOOST EFFICIENCY
vs. INPUT VOLTAGE

MAX8901A/B toc07
INPUT VOLTAGE (V)
EFFICIENCY (%)356
BOOST
LED
6WLEDs,
INDUCTOR: TOKO A915AY-220M,
DIODE: CENTRAL SEMI CMDSH05-40
IN CURRENT (IIN)
vs. SUPPLY VOLTAGE
MAX8901A/B toc08
SUPPLY VOLTAGE (V)
IIN
MAX8901B
MAX8901A
1μs/div
SWITCHING WAVEFORMS

50mV/div
AC-COUPLED
MAX8901A/B toc9
0mA
10V/div
100mV/div
AC-COUPLED
100mA/div
VLX
VOUT
ILX
20ms/div
INPUT OVERVOLTAGE
PROTECTION RESPONSE

MAX8901A/B toc10
0mA
10V/div
1V/div
(AC-COUPLED)
20mA/div
20mA/div
VIN
VOUT
ILEDs
VLX
6.4V
5.4V
STARTUP AND SHUTDOWN
RESPONSE (MAX8901A)

MAX8901A/B toc11
0mA
0mA
10V/div
2V/div
20mA/div
100mA/div
VON
VOUT
ISUPPLY
ILEDs
C2 = 0.1μF
STARTUP AND SHUTDOWN
RESPONSE (MAX8901B)

MAX8901A/B toc12
0mA
0mA
10V/div
2V/div
20mA/div
100mA/div
VON
VOUT
ISUPPLY
ILEDs
MAX8901A/MAX8901BHighest Efficiency Supply
for 2 to 6 Series WLEDs in a
2mm x 2mm TDFN Package
Typical Operating Characteristics (continued)

(Circuit of Figure 5, ILED= 24.75mA, VIN= VON= 3.6V, C1 = 1µF, C2 = 1µF, TA= +25°C, unless otherwise noted.)
VCS vs. LED CURRENT STEP
(MAX8901B)

LED CURRENT STEP
(mV)
MAX8901A/B toc165101520253035
MAXIMUM LED CURRENT
vs. TEMPERATURE (MAX8901B)
MAX8901A/B toc17
TEMPERATURE (°C)
ILED
(mA)
MINIMUM LED CURRENT
vs. TEMPERATURE (MAX8901B)

MAX8901A/B toc18
TEMPERATURE (°C)
ILED3510-15
4ms/div
PWM DIMMING RESPONSE
(MAX8901A)

MAX8901A/B toc13
0mA
2V/div
20mA/div
20mV/div
VON
VIN
VCS
VOUT
ILEDs
D = 10%D = 90%
50mV/div
(AC-COUPLED)
500mV/div
fON_PWM = 100kHz, DUTY
CYCLE CHANGE: 90% TO
10%, C2 = 0.1μF
10ms/div
SERIAL PULSE DIMMING
RESPONSE (MAX8901B)

MAX8901A/B toc14
0mA
2V/div
20mA/div
20mV/div
VON
VIN
VCS
VOUT
ILEDs
50mV/div
(AC-COUPLED)
1V/div
LED CURRENT vs. PWM
DIMMING (MAX8901A)
MAX8901A/B toc15
PWM DUTY CYCLE (%)
ILED
(mA)
RCS = 20Ω,
fPWM = 100kHz
MAX8901A/MAX8901BHighest Efficiency Supply
for 2 to 6 Series WLEDs in a
2mm x 2mm TDFN Package
Pin Description
PINNAMEFUNCTION
OVP
WLED Overvoltage Protection Input. OVP monitors voltage at the WLEDs. Connect OVP to the
positive terminal of the output capacitor. If an OVP condition is detected, the MAX8901_ latch off.
Cycle VIN or toggle VON to restart the IC.
2ON
Enable and Dimming Control Input. Drive ON high to enable the IC. Drive ON low for greater than
1.33ms (typ) to shutdown the WLED current regulator.
For the MAX8901A: After VIN is above VUVLO and ON is driven high, the MAX8901A enters soft-start

and increases the WLED current to full brightness. Apply a minimum 30kHz (500kHz max) PWM
signal to ON to adjust the WLED brightness from 100% to off, proportional to the duty cycle of the
PWM signal. See the PWM Dimming Control (MAX8901A) section for more details.
For the MAX8901B: After ON is driven high for 40µs (min), the MAX8901B enters soft-start and

increases the WLED current to full brightness. Subsequent pulses on ON cause the MAX8901B
WLED current to decrease in 32 equal steps. See the Serial-Pulse Dimming Control (MAX8901B)
section for more details.
3IN
Power Supply Input. Bypass IN to GND with a 1µF ceramic capacitor placed as close as possible to
the IC. If VIN exceeds the input overvoltage lockout threshold (6.5V max, VIN rising), the IC stops
switching and no WLED current flows (if the forward voltage of the WLED string is greater than VIN).
When VIN falls below the overvoltage lockout hysteresis level (6.0V min, VIN falling), soft-start is
initiated and normal operation resumes.LXBoost Inductor Node. Connect an inductor between IN and LX. LX is high impedance in shutdown.PGNDPower Ground. Connect to GND and the exposed paddle (EP) with a short, wide trace.GNDAnalog Ground. Connect GND to the exposed paddle with a short, wide trace.COMP
WLED Boost Compensation Node. Connect a 0.022µF ceramic capacitor from COMP to GND.
CCOMP stabilizes the converter and sets the soft-start time. COMP discharges to GND when in
shutdown.
8CS
WLED Current Sense Input. For the MAX8901A, connect a current-sense resistor from CS to GND.
Voltage sensed at CS regulates the WLED current. For the MAX8901B, do not connect a sense
resistor from CS to GND. The MAX8901B provides an internal current source from CS to GND to
program the WLED current. The MAX8901B regulates VCS to 0.5V (typ) for all ILED. The MAX8901A
regulates VCS to 0.5V (typ) for maximum duty cycle only.
—EPExposed Metal Paddle. Connect EP to GND. For good thermal dissipation, the exposed paddle must
be connected to a large ground plane.
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