DCDC MONOLITHIC POWER MANAGEMENT SOLUTIONS

1
DC-DC MONOLITHICPOWER MANAGEMENT SOLUTIONS

• Lighting and Converters BU
• IPC Division

October 2008
2
High Efficiency Monolithic Switching Regulators
to suit different markets
Portable Applications
L692x
Industrial, Consumer Automotive
L497x, L597x, L597x, L598x, L798x, A597x,
L497x, L597x, L597x, L598x, A597x, L798x,
LED770x
LED Lighting
IN DEVELOPMENT
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• Portable Applications

4
L692x Application Circuits
L6926/8
L6920D/DB
L6925
L6924D/U
5
L692x Key Features
L6924U
up to 1A

• Very small packages
• Internal synchronous switch
• Small number of external components
• Micro power consumption
• High efficiency
• Short circuit protection, OVP, thermal shutdown
• Battery detection

Li-Ion BATT CHARGER
QFN3x3 16L
L6924D
up to 1A
1A (switch) up to 1MHz
L6920D
TSSOP8
BOOST
0.8A (switch) up to 1MHz
L6920DB
MSOP8
800mA up to 2MHz
MSOP8
L6928
800mA up to 1.4MHz
L6926
STEP-DOWN
QFN3x3 8L
800mA up to 1.4MHz
L6925
Device
Package
Type
Ipk A
Iout A
Vin V
Vout V
Fsw KHz
Extra functions
L6920D
TSSOP8
SU
1
0.5
0.6 - 5.5
2 - 5.2
up to 1000
LBILBO, Vref, SHDN
L6920DB
MSOP8
SU
0.8
0.4
0.6 - 5.5
1.8- 5.2
up to 1000
LBILBO, Vref, SHDN
1.2
0.8
UVLO2.7V, LBILBO
L6925D
MSOP8
SD
2.7 - 5.5
0.6 - Vin
600
L6926
MSOP8
SD
1.2
0.8
2 - 5.5
0.6 - Vin
600
PGOOD, RUN, SYNC
L6926Q1
QFN3x3-8L
SD
1.2
0.8
2 - 5.5
0.6 - Vin
600
PGOOD, RUN, SYNC
1.2
0.8
PGOOD, RUN, SYNC
L6928D
MSOP8
SD
2 - 5.5
0.6 - Vin
1400
L6928Q1
QFN3x3-8L
SD
1.2
0.8
2 - 5.5
0.6 - Vin
1400
PGOOD, RUN, SYNC
TSSOP8
MSOP8
QFN3x3
6
L6924x Key Features

• Fully integrated solution, with a power MOSFET,
  reverse blocking diode, sense resistor, and
  thermal protection
• Both linear and quasi-pulse operation
• Closed loop thermal control
• Vin from 2.5V to 12V
• USB BUS-compatible (L6924U)
• Programmable charge current up to 1A
• Programmable charge current up to 500 mA in USB
  mode (L6924U)
• Programmable pre-charge current (L6924D)
• Support for USB high and low power input (L6924U)
• Programmable end-of-charge current
• Programmable pre-charge voltage threshold
  (L6924D)
• Programmable charge timer
• Programmable output voltage at 4.1V and4.2V, with
  1 output voltage accuracy (L6924D)
• NTC or PTC thermistor interface for battery
  temperature monitoring and protection
• Flexible charge process termination (L6924D)
• Full set of default charging parameters
• Status outputs to drive LEDs or to interface with
  a host processor
• Small VFQFPN 16-leads package (3mm x 3mm)

QFN3x3 16L
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Application Example Blood Glucose Meter Block
Diagram Supplied with 1 Alkaline Cell
BIO SENSOR
8
Industrial,Consumer Automotive
Industrial, Consumer Automotive
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Suggested in new projectsonly whenVingt36VIout
gt2A
10
L497x family

• Up to 3.5A available both in DIP and SO packages
• Wide voltage input range (8V up to 55V) and
  output range (0.5V up to 50V)
• Internal current limit
• Inhibit pin
• OVP
• External reference

L4973
3.5A / up to 300 KHz
SO20 DIP18
L4978
2A / up to 300 KHz
DIP8 SO16W
L4971
1.5A / up to 300 KHz
L4976
1A / up to 300 KHz
all but L4976 , L4976 and L4973
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L497x Application Circuits
L4976
L4971/78
L4973
12
Suggested in new projectsonly when Vingt18V
13
L597x Family

• More than 2A in small SO8 package with minimum
  external component count
• P-channel power MOS no bootstrap capacitor
• Wide input voltage range (4.4V up to 36V)
• High switching frequency (250KHz/500KHz, sync
  up to 700KHz)
• Inhibit pin
• Embedded protection features

HSOP8
L5973D
2A /250KHz
L5973AD
1.5A / 500KHz
L5972D
1.5A / 250KHz
SO8
L5970AD
1A / 500KHz
L5970D
1A / 250 KHz
all but L5972D
SO8 - Rth j-amb 115C/W Rth j-amb 62C/W
for L5972D
HSO8 - Rth j-amb 40C/W
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L597x Test Application Circuit
x
15
Suggested in new projectsonly when Vinlt18V
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L598x Family

• More than 2A in small QFN3x3-8L package with
  minimum external component count
• P-channel power MOS no bootstrap capacitor
• Wide input voltage range (2.9V up to 18V)
• High switching frequency (250KHz, adjustable up
  to 1MHz) with Synchronization capability
• Internal Soft-start
• Inhibit pin
• Embedded protection features
• Suitable for MLCC output filter

L5985
2A / up to 1MHz
QFN8 3x3
L5983
1.5A / up to 1MHz
L5981
1A / up to 1MHz
L5980
0.7A / up to 1MHz
QFN 3x3 8L - Rth j-amb 60C/W
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L598x Application Test Circuit
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Suggested in new Automotive Application projects
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A597x Key Features
B5973D

• More than 2A in small SO8 package with minimum
  external component count
• P-channel power MOS no bootstrap capacitor
• Wide input voltage range (4V up to 36V)
• High switching frequency (250KHz/500KHz, synch up
  to 700KHz)
• Inhibit pin
• Embedded protection features
• Operates over the -40C to 85C Ambient
  temperature range (-40C to 125C )

2A /250KHz
HSOP8
A5973D
2A /250KHz
A5973AD
1.5A / 500KHz
A5972D
1.5A / 250KHz
SO8
A5970AD
1A / 500KHz
A5970D
1A / 250 KHz
all but A5972D B5973D
HSO8 - Rth j-amb 40 C/W
SO8 - Rth j-amb 115 C/W Rth j-amb 62
C/W for L5972D
The A597x family is tailored for Automotive
applications, qualified following the AEC-Q100
specifications PPAP available for details
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A597x Application Circuit Example
L1 15uH
Vout3.3V
VIN4V to 36V
OUT
VCC
1
8
SYNCH
COMP
R1 5k6
2
D1 STPS340U
A597xD B5973D
4
C4 22nF
FB
C2 330uF 6.3V
C1 100uF IRMS1A
5
6
3
7
C3 220pF
R3 4k7
VREF 3.3V
R2 3k3
GND
INH
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A6902D Key Features

• 1A in small SO8 package with minimum external
  component count
• P-channel power MOS no bootstrap capacitor
• Wide input voltage range (8V up to 36V)
• High switching frequency (250KHz)
• External VREF available
• Embedded protection features
• Operates over the -40C to 85C Ambient
  temperature range

SO8 - Rth j-amb 115C/W
The A6902D is tailored for Automotive
applications, qualified following the AEC-Q100
specifications PPAP available for details
22
A6902D Application Circuit Example
23
New Comers road map
24
Suggested in new projectsonly when
Vinlt18VIoutgt2A
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L5986/A-7/A Key Features

• More than 3A in small QFN3x3-8L package with
  minimum external component count
• P-channel power MOS no bootstrap capacitor
• Wide input voltage range (2.9V up to 18V)
• High switching frequency (250KHz, adjustable up
  to 1MHz) with Synchronization capability
• Internal Soft-start
• Inhibit pin
• Embedded protection features
• Suitable for MLCC output filter

L5987
QFN8 3x3
3A / up to 1MHz
HSOP8
L5986
2.5A / up to 1MHz
ES available Mass Prod. Q4-08
Extra Functions
Fsw (kHz)
Vout (V)
Vin (V)
Iout (A)
Ipk (A)
Package
Device
Inh, AdjFsw, Sync
250
0.6V to Vin
2.9V to 18V
2.5
3
QFN3x3-8L/HSOP8
L5986/A
Inh, AdjFsw, Sync
250
0.6V to Vin
2.9V to 18V
3
3.5
QFN3x3-8L/HSOP8
L5987/A
HSO8 - Rth j-amb 40 C/W
QFN 3x3 8L - Rth j-amb 60C/W
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L5986/A-7/A Application Test Circuit
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L5988-9D Key Features

• Up to 4A in small HTSSOP 16 package with minimum
  external component count
• Synchronous rectification with P-channel power
  MOS no bootstrap capacitor
• Wide input voltage range (2.9V up to 18V)
• High switching frequency (400KHz, adjustable up
  to 1MHz)
• Adjustable Soft-start and Inhibit function
• Embedded over current (adjustable threshold),
  over voltage and thermal protection
• PGood signal (L5989D) Synchronization capability
  (L5988D)
• Pre-bias start-up capability
• Multifunction pin (adjustable UVLO, latched/no
  latched OVP and sink-mode capability)
• 1.8v 2 reference voltage
• Suitable for MLCC output filter

For an higher EFFICIENCY
SYNCH. RECT.
L5989D
up to 4A / up to 1MHz
HTSSOP16
L5988D
ES available Mass Prod. End Q4-08
Device
Package
Ipk A
Iout A
Vin (V)
Vout (V)
Fsw KHz
Extra functions
2.9V to 18V
0.6V to Vin
400
L5988D
HTSSOP 16
5
4
Synchronization
5
0.6V to Vin
400
L5989D
4
2.9V to 18V
Pgood
HTSSOP 16
HTSSOP 16 - Rth j-amb 40C/W
28
L5988D Application Test Circuit
29
Suggested in new projectsonly when Vingt18V
30
L7980/A-1/A Key Features

• More than 3A in both small QFN3x3-8L and HSOP8
  packages with minimum external component count
• P-channel power MOS no bootstrap capacitor
• Wide input voltage range (4.5V up to 28V)
• High switching frequency (250KHz, adjustable up
  to 1MHz) with Synchronization capability
• Internal Soft-start
• Enable pin
• Embedded protection features
• Suitable for MLCC output filter

L7981/A
QFN8 3x3
3A / up to 1MHz
HSOP8
L7980/A
2A / up to 1MHz
ES End Q3-08 Mass Prod. Q1-09
Extra Functions
Fsw (kHz)
Vout (V)
Vin (V)
Iout (A)
Ipk (A)
Package
Device
En, AdjFsw, Sync
250
0.6V to Vin
4.5V to 28V
2
2.5
QFN3x3-8L/HSOP8
L7980/A
En, AdjFsw, Sync
250
0.6V to Vin
4.5V to 28V
3
3.5
QFN3x3-8L/HSOP8
L7981/A
HSO8 - Rth j-amb 40 C/W
QFN 3x3 8L - Rth j-amb 60C/W
31
L7980/A-1/A Application Test Circuit
32
L7985/A-6/A Key Features

• More than 3A in both small QFN3x3-10L and HSOP8
  packages with minimum external component count
• P-channel power MOS no bootstrap capacitor
• Wide input voltage range (4.5V up to 40V)
• High switching frequency (250KHz, adjustable up
  to 1MHz) with Synchronization capability
• Internal Soft-start
• Enable pin
• Embedded protection features
• Suitable for MLCC output filter

L7985/A
QFN10 3x3
3A / up to 1MHz
HSOP8
L7986/A
2A / up to 1MHz
ES Q4-08 Mass Prod. Q1-09
Extra Functions
Fsw (kHz)
Vout (V)
Vin (V)
Iout (A)
Ipk (A)
Package
Device
En, AdjFsw, Sync
250
0.6V to Vin
4.5V to 40V
2
2.5
QFN3x3-10L/HSOP8
L7985/A
En, AdjFsw, Sync
250
0.6V to Vin
4.5V to 40V
3
3.5
QFN3x3-10L/HSOP8
L7986/A
HSO8 - Rth j-amb 40 C/W
QFN 3x3 10L - Rth j-amb 60C/W
33
L7985/A-6/A Application Test Circuit
34
LED Lighting
35
How use a DC-DC as LED Driver?
External line
DC/DC
AC/DC
Iled
Rsense
Standard Lighting Schematic
36
DC-DC used in LED lighting
37
L4973D Powering High Current White LEDsWith Vfb
down to 0. 5V
Vin48V
Vref-Vfb
50KW
R1
Vfb-Vsense
18 Sync
7,8 Vcc
16 5.1V
12 Vfb
20KW
220nF 63V
78KW
R2
9 Boot
L4973V3.3
1 Osc
220nF 63V
150mH
4,5,6 13,14,15 GND
2.3 Out
17 SS
11 Comp
10 INH
1000mF 63V
2.7nF
Vled
470nF
220nF
D1
Up to 12 LEDs
3x100mF 40V
9.1KW
Vsense 0.5V
Rsense
22nF
The resistors divider on The FB pin is used in
Order to reduce the Vfb From 3.3V to 0.5V
VsenseVfb-(Vref-Vfb)/R1xR2
All the Efficiencies are specified considering
only the LEDs output power
h(Vled x Iout)/(Vin x Iin)
Application described in AN 1891 More LED
applications in AN 1941
38
L5970D Powering High Current White LEDsWith Vfb
down to 0.45V
15 ?H
VIN 12V to 24V
Up to 6 LEDs
OUT
VCC
Vref-Vfb
330mF 25V
STPS2L25U
VREF
Vled
COMP
L5970D
22nF
40KW
R1
Vfb-Vsense
FB
10?F 35V
INH
GND
15KW
R2
220pF
4.7KW
Rsense 1.3O
Vsense0.45V
VsenseVfb-(Vref-Vfb)/R1xR2
All the Efficiencies are specified considering
only the LEDs output power
h(Vled x Iout)/(Vbatt x Iin)
Application described in AN 1891 More LED
applications in AN 1941
39
L597x driving HB-LEDs OPAMP

• Vin4.4V to36V
• Up to 8 W-LEDs in series
• Fsw250/500kHz with Synch
• capability
• Ext OPAMP reducing power
• losses
• Good PWM dimming
• performance
• 1W and 3W HB-LEDs

Reducing the power losses And increase the
efficiency
40
L598x Powering High Current LEDs
L1
VIN from 2.9V to 18V
OUT
VCC
1
8
D1
Up to 4 White LEDs
SYNCH
INH
Cout
2
3
L598x
GND
7
FB
Cin
5
6
4
C3
COMP
FSW
R3
RSense
41
L598x driving HB-LEDs OPAMP

• Vin2.9V to18V
• Up to 4 W-LEDs in series
• Fsw250kHz adjustable
• up to 1MHz with Synch
• capability
• Ext OPAMP reducing power
• losses and enhance dimming
• performance
• 1W and 3W HB-LEDs

Reducing the power losses And increase the
efficiency
42
L598x driving HB-LEDs

• Vin2.9V to18V
• Up to 4 W-LEDs in series
• Fsw250kHz adjustable
• up to 1MHz with Synch
• capability
• No Ext OPAMP cost effective
• approach
• Dimming based on Switch
• in series to LEDs
• 1W HB-LEDs

Reducing the power losses And increase the
efficiency
43
L597x Positive BUCK BOOST Topology
Vref-Vfb
Vled
Vfb-Vsense
This topology is used in order To elevate the N.
of LEDs Compared to a standard Buck Topology
VsenseVfb-(Vref-Vfb)/R1xR2
More LED applications in AN 1891 and AN 1941
44
L5970D Negative BUCK BOOST Topology
15 ?H
Vin12V
VCC
VOUT
Vsense0.45V
Vfb-Vsense
STPS2L25U
L5970D
FB
COMP
22nF
0.68W
15KW
Vref-Vfb
VREF
R2
INH
GND
10?F 10V
10?F 25V
R1
330?F 25V
Iout 350mA
220pF
40KW
4.7KW
Vled
Up to 6 LEDs
This topology is used in order To elevate the N.
of LEDs Compared to a standard Buck Topology
VsenseVfb-(Vref-Vfb)/R1xR2
All the Efficiencies are specified considering
only the LEDs output power
h(Vled x Iout)/(Vbatt x Iin)
45
L6902D Powering high current White LEDs
100mV
Up to 6 LEDs
22 ?H
VIN 12V to 24V
Rsense
Vcc
OUT
193KW
COMP
STPS340U
100 ?F 25v
22nF
CS
R1
L6902D
CS-
10 ?F 25v
FB
220pF
GND
Vref
5.1KW
R2
10KW
The resistors divider On FB is not mandatory But
is used to clamps the Maximum output voltage To
1.23x1-(R1/R2)
All the Efficiencies are specified considering
only the LEDs output power
Application described in AN 1891 More LED
applications in AN 1941
46
LED7706 Main Features
Output voltage up to 36V
Input voltage range 4.5V to Vout

• BOOST SECTION
• 4.5V to 36V Input Voltage range
• Internal 5V LDO
• Internal Power-MOSFET
• Up to 93 Efficiency
• Up to 36V Output Voltage
• 200kHz to 1MHz Switching Frequency
• Programmable Soft-Start Duration
• Programmable OV and OC Protections
• Single Ceramic Output Capacitor
• Fixed FSW Peak Current Mode control
• External sync for multi-device application

Internal Power-MOS
BOOST CTRL
EN
Internal 5V LDO
ROWS CTRL
LDO
MODE
FAULT MNGMT
FAULT

• BACKLIGHT DRIVER SECTION
• Six ROWs capable of driving multiple LEDs in
• series (e.g. up to ten WLEDs per ROW)
• Up to 30mA Programmable Output Current per ROW
• 1.5 Current Matching between ROWs
• Shorted LED Fault Detection
• Open ROW Fault Detection
• PWM Dimming (500ns minimum dimming ON time)
• Capability to Disconnect Unused ROWs

DIM
RILIM
Six rows, up to 10 WLEDs each
Shorted LED and open row management
Up to 30mA programmable output current
PWM dimming
47
LED7706 Application Schematic
6.8µH
VOUT up to 36V
VIN 4.5V to VOUT
Slope Compensation
OVP selection
4.7µF MLCC
5V
Switching Frequency selection
SLOPE
VIN
OVSEL
LX
SWF
AVCC
LDO5
ROW1
Internal MOS OCP
ROW2
BILIM
Rows current selection
ROW3
RILIM
ROW4
SS
LED7706
ROW5
COMP
SGND
ROW6
FAULT
EN
SYNC
MODE
DIM
PGND
Up to 10 WLEDs per row
Dimming
Fault
Faults Management Selection
Sync Output
Enable
48
LED7707 Main Features
Input voltage range 4.5V to Vout
Output voltage up to 36V

• BOOST SECTION
• 4.5V to 36V Input Voltage range
• Internal 5V LDO
• Internal Power-MOSFET
• Up to 93 Efficiency
• Up to 36V Output Voltage
• 200kHz to 1MHz Switching Frequency
• Programmable Soft-Start Duration
• Programmable OV and OC Protections
• Single Ceramic Output Capacitor
• Fixed FSW Peak Current Mode control
• External sync for multi-device application

Internal Power-MOS
BOOST CTRL
EN
Internal 5V LDO
ROWS CTRL
LDO
MODE
FAULT MNGMT
FAULT

• BACKLIGHT DRIVER SECTION
• Six ROWs capable of driving multiple LEDs in
• series (e.g. up to ten WLEDs per ROW)
• Up to 85mA Programmable Output Current per ROW
• Parallelable ROWs for higher current
• 2 Current Matching between ROWs
• Shorted LED Fault Detection
• Open ROW Fault Detection
• PWM Dimming (3µs minimum dimming ON time)
• Capability to Disconnect Unused ROWs

DIM
RILIM
Six rows, up to 10 WLEDs each
Shorted LED and open row management
Up to 85mA programmable output current
PWM dimming
ES Available Mass Prod. End Q3-08
49
LED7707 HC LEDs Driving Solution
6.8µH
VOUT up to 36V
VIN 4.5V to VOUT
Slope Compensation
OVP selection
10µF MLCC
5V
Switching Frequency selection
SLOPE
VIN
LX
OVSEL
SWF
AVCC
LDO5
ROW1
Internal MOS OCP
ROW2
BILIM
Rows current selection
ROW3
RILIM
Up to 10 High-Current (510mA) WLEDs
ROW4
SS
LED7707
ROW5
COMP
ROW6
SGND
FAULT
EN
SYNC
MODE
DIM
PGND
Dimming
Fault
Faults Management Selection
Enable
Sync Output
50
New Comers
51
L7980/A-1/A Powering High Current LEDs
Up to 6 White LEDs
52
L7985/A-6/A Powering High Current LEDs
Up to 10 White LEDs
53
DC-DC SingleMulti out (external mosfet)
54
DCDC Single Multi-output solutionsquick
reference
Single Output DCDC Controllers (external MOSFET)

Multi Output DCDC Converters
Basic DCDC Controllers
Others
Multi Output DCDC Converters PWM with Ext MOSFET
LDOs
Multi Output DCDC Converters PWM with Integrated
MOSFET LDO
Several Programmability Options (FSW, UVP, OVP,
ref)
Minimum part count, Embedded protections
PM6670S/A
PM6641
1 PWM 1 LDO
L6725/A
L6726A
PM6675S/A
3 SYNCH. SW. REG 1 LDO
1 PWM 1 LDO
L6727
L6730/B
PM6680/A
2 PWM 1 LDO
L6728
L6730CQ
PM6681A
2 PWM 2 LDO
L6728A
L6731D
PM6685
L6732
2 PWM 1 LDO
L6910/A
L6997
Notes Synchronous rectification only
55
Single Output Step Down DCDC Controllers
(external FETs)
56
Multi Output Power Management ICsSelection by
VOUT
() ? MOSFET EMBEDDED (7 2x 3 synch. Step down
1 x LDO) () in development
VIN up to 36V ? PM66xxA VIN up to 28V ? PM66xx