MAX777 ,(MAX778 / MAX779) Low Voltage Input Output / Setp up DC-DC ConvertersELECTRICAL CHARACTERISTICS
MAX 777/MAX 7 78/MAX 7 79
(VIN = 2.5V, ILOAD = 0mA, LX Tr. 22pH, C ..
MAX777LCSA ,Low-Voltage Input, 3V/3.3V/5V/ Adjustable Output, Step-Up DC-DC Convertersapplications (where the input can be above or below the out-MAX777LCSA 0°C to +70°C 8 SOput), refer ..
MAX77826EWJ+T ,Power Management ICApplications• 3 x 300mA● GSM, GPRS, EDGE, CDMA WCDMA, and LTE • 6 PMOSLS LDOs (V Range: 0.8V to 3.9 ..
MAX778CSA , Low-Voltage-Input, 3V/3.3V/5V/Adjustable-Output, Step-Up DC-DC Converters
MAX778ESA , Low-Voltage-Input, 3V/3.3V/5V/Adjustable-Output, Step-Up DC-DC Converters
MAX778LCSA ,Low-Voltage Input, 3V/3.3V/5V/ Adjustable Output, Step-Up DC-DC ConvertersFeaturesThe MAX777L/MAX778L/MAX779L are pulse-skipping DC-DC' 1V to 4.5V Input Guarantees Start-Up ..
MB6M ,MINIATURE GLASS PASSIVATED SINGLE-PHASE BRIDGE RECTIFIERThermal Characteristics (TA = 25°C unless otherwise noted)Parameter Symbol MB2M MB4M MB6M UnitDevic ..
MB6S ,Bridge RectifiersThermal Characteristics (T = 25°C unless otherwise noted)AParameter Symbol MB2S MB4S MB6S UnitDevic ..
MB7117E , Schottky TTL 2048-Bit Bipolar Programmable Read-Only Memory
MB71A38-25 , PROGRAMMABLE SCHOTTKY 16384-BIT READ ONLY MEMORY
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MAX777
(MAX778 / MAX779) Low Voltage Input Output / Setp up DC-DC Converters
AIVANGE MF0lltllum0l8 _
All information in this data sheet is preliminary
and subject to change.
8/93 'iiit1i"iilfti1Eil
Al ALUA'TION (EB AVA
General Description
The MAX777/MAX778NAX779 are pulse-skipping, DC-DC
converters that step-up from low-voltage inputs (1V,
guaranteed). They require only three external components
-an inductor (typically 22PH), and two capacitors. The
MAX777 delivers a 5V output, the MAX778 generates pin-
selectable voltages of 3.0V or 3.3V, and the MAX779 output
can be adjusted from IV to 6V via an external resistor
divider.
The devices include an active rectifier that eliminates the
need for an external catch diode. It also permits regulation
even when the input is greater than the output. And, unlike
other step-up converters, the MAX777/MAX778/MAX779'S
active rectifier is disabled in shutdown mode. When
disabled, the active rectifier appears as a very high
impedance in series with the input, inductor, and load. This
high impedance effectively stops current drain associated
with conventional step-up converters in the shutdown state.
The high-frequency operation of these devices (up to
300kHz) allows the use of small surface-mount inductors
with values of 10pH or less. Supply current is 220pA under
no load and only 2CPA in the standby mode. Supply voltage
can range from IV to 6.2V (1 to 4 cells). mm a 2V input,
these devices can deliver 200mA at 5V or 300mA at 3V.
For step-up/step-down applications (where the input can be
both above and below the output), refer to the
MAX877/MAX878/MAX879 data sheet.
Applications
Single Battery-Cell (1V), Step-Up
Voltage Conversion
Efficient, High-Power Step-Up Regulation
from Low Input Voltages
Pagers
Portable Instruments & Handy-Terminals
Laptop and Palmtop Computers
Pin Configuration
2flvlL4lh2aLflefl]
LotarAfollitageAlinptudt,
SWaStf/stffadrghrsitallthsithgitpMt, SitepAllp D3430 Converters
Fea tures
. IV to 6.2V Input Guaranteed Start-Up Under Load
. Up to 240mA Outputs
85% Typical Efficiency
. Also Regulates When Input Voltage is Above the
Output Voltage
. lnternal1A Power Switch
. Adjustable Current-Limit
. Internal 1A Active Rectifier with lnput-to-Load
Disconnect in Shutdown
. 22mm Quiescent Supply Current
. 2mm Shutdown Supply Current
. 3V13.3V, 5V, and Adjustable Output-Voltage
Versions
Ordering Information
PART TEMP. RANGE PIN-PACKAGE
MAX7770PA 0°C to +70°C a Plastic DIP
MAX777CSA tPC to move 8 so
MAX777C/D 0°C to +70°C Dice'
MAX777EPA -40''C to +86°C a Plastic DIP
MAX777ESA -4tPC to +35°c s so
MAX777MJA -55''C to +125°C 8 CERDIP
{5 6£4XVW8££XWW£££XWW
TOP VIEW
ILIM 1 a m MAxmt
E MAXIM El _( )
m E my]; El SHDN
AGND 3 77
C MAX779 El OUT
PGND E El Lx
DIP/SO
ts/r.i (MAX778), rs (MAX779)
Ordering Informa tion continued on last page.
. Contact factory for dice specifications.
Typical Operating Circuit
1V T0 6.2V
0m _ tArt; om Tti-
PGND AGND
OUTPUT
Call toll free 1-800-998-8800 for free samples or literature.
Maxim Integrated Products 4-189
Low. 1follilage-llinpuit,
SWaSWSWAdliustalblleAhnptrt, SitepAlllp mac Converters
ELECTRICAL CHARACTERISTICS
MAX 777M151}! 778MM 779
(Vm = 2.5V. ILOAD = 0mA, LX = 22pH, CF = 100uF, BRUN and 1le connected to IN, TA = +25°C, unless otherwise noted.)
PARAMETER CONDITIONS MIN TYP MAX UNITS
3V/3.3V = open:
l/iv/j/i/tCII/gt-ii,',',)'),),); 2.88 300 3.12
OmA < ILOAD < 100mA ij, 'ii'iftye) (E temp range)
fle)trtage 1:21 : 1:: : It) :;¢.;.:5.3.... a 17 3.30 3.43 V
1.2V < VIN < 3.3V (E temp range)
XS'ZVVWOEEV (TA = TMIN to TMAX) 2.88 3.00 3.12
OmA < ILOAD < 240mA
3V/3.3V=0V: 3.17 3.30 3.43
1.8V < VIN < 3V (TA = TMIN to TMAX)
1.0V < VIN < 5V (TA=+25°C).
Output Voltage OmA < (LOAD < 60mA 1.1V < V;N< 5V (C temp range), 4.8 5.0 5.2
MAX777 1.2V < V1N< 5V (E temp range) V
OmA < 'LOAD < 150mA 1.8V
Efficiency ILOAD = 100mA, VIN = 2.5V 86 %
No-Load Supply Current TA = TMIN to TMAX, ILOAD = 0mA 220 310 11A
Shutdown Supply Current TA = TMIN to TMAX, 0V < WWI < VSTH 0 20 30 11A
. 0V < Elm < VSTH 100 nA
SWISN Bias Current TA = TMIN to TMAX VSTH < SRON < SV 40 “A
VIN = 1V 0.55 0.90
SW Threshold (VSTH) TA = TMIN to TMAX VIN = 2.5V 1.20 1.60 V
VIN = 5V 2.00 2.80
SflON Enable Delay 150 us
Current Limit 1.0 A
Current Limit Tempco -0.3 %/°C
lsw = 400mA 0.275
Switch Saturation Voltage Isw = 600mA 0.350 V
lsw = 1000mA 0.550
Switch-Off Leakage Current TA = TMIN to TMAX, 0V < SW < VSTH 0.4 2.0 pA
VIN = 2.5V 4.0
Maximum Switch-On Time VIN = 1.8V 5.9 us
l/eq = 1V 12.6
Minimum Switch-Off Time MAX778 2.5 us
MAX777 1.5
. . Iour = 400mA 0.21
gfggfler Forward Voltage IOUT = 600m A 0.31 V
IOUT = 1000mA 0.50
4-190 MAXIM
