2003 Oct 13
2
Philips Semiconductors
Preliminary specification
High efficiency auto-up/down
DC/DC converter
TEA1211HN
CONTENTS
1
FEATURES
2
APPLICATIONS
3
GENERAL DESCRIPTION
4
ORDERING INFORMATION
5
BLOCK DIAGRAM
6
PINNING
7
FUNCTIONAL DESCRIPTION
7.1
Introduction
7.2
Control mechanism
7.2.1
PWM
7.2.2
PFM
7.2.3
Switching sequence
7.3
Adjustable output voltage
7.4
Start-up
7.5
Under voltage lockout
7.6
Shut-down
7.7
Power switches
7.8
Synchronous rectification
7.9
PWM-only mode
7.10
External synchronisation
7.11
Current limiter
7.12
I
2
C-bus serial interface
7.12.1
Characteristics of the I
2
C-bus
7.12.2
START and STOP conditions
7.12.3
Bit transfer
7.12.4
Acknowledge
7.13
I
2
C-bus protocol
7.13.1
Addressing
7.13.2
Data
7.13.3
Write Cycle
8
LIMITING VALUES
9
THERMAL CHARACTERISTICS
10
CHARACTERISTICS
11
APPLICATION INFORMATION
11.1
Typical Li-Ion, 2- or 3-cell application with
I
2
C-bus programming
11.2
Component selection
11.2.1
Inductor
11.2.2
Capacitors
11.2.3
Schottky diodes
11.2.4
Feedback resistors
11.2.5
Current Limiter
12
PACKAGE OUTLINE
13
SOLDERING
13.1
Introduction to soldering surface mount
packages
13.2
Reflow soldering
13.3
Wave soldering
13.4
Manual soldering
13.5
Suitability of surface mount IC packages for
wave and reflow soldering methods
14
DATA SHEET STATUS
15
DEFINITIONS
16
DISCLAIMERS
17
PURCHASE OF PHILIPS I
2
C COMPONENTS
2003 Oct 13
3
Philips Semiconductors
Preliminary specification
High efficiency auto-up/down
DC/DC converter
TEA1211HN
1
FEATURES
I
2
C-bus programmable output voltage range of
1.5 V to 5.5 V
Single inductor topology
High efficiency up to 94 % over wide load range
Wide input range; functional from 2.55 V up to 5.5 V
1.7 A maximum input and output current
Low quiescent power consumption
600 kHz switching frequency
Four integrated very low R
DS(on)
power MOSFETs
Synchronizable to external clock
Externally adjustable current limit for protection and
efficient battery use in case of dynamic loads
Under voltage lockout
PWM-only option
Shut-down current less than 1
A
32-pin small body HVQFN package.
2
APPLICATIONS
Stable output voltage from Lithium-Ion batteries
Variable voltage source for PAs (Power Amplifiers) in
cellular phones
Wireless handsets
Hand-held instruments
Portable computers.
3
GENERAL DESCRIPTION
The TEA1211HN is a fully integrated auto-up/down
DC/DC converter circuit with I
2
C-bus interface. Efficient,
compact and dynamic power conversion is achieved using
a digitally controlled pulse width and frequency modulation
like control concept, four integrated low R
DS(on)
power
switches with low parasitic capacitances and fully
synchronous rectification.
The combination of auto-up/down DC/DC conversion, high
efficiency and low switching noise makes the TEA1211HN
well suited to supply a power amplifier in a cellular phone.
The output voltage can be I
2
C-bus programmed to the
exact voltage needed to achieve a certain output power
level with optimal system efficiency, thus enlarging battery
lifetime.
The TEA1211HN operates at 600 kHz switching frequency
which enables the use of small size external components.
The switching frequency can be locked to an external high
frequency clock. Deadlock is prevented by an on-chip
under voltage lockout circuit. An adjustable current limit
enables efficient battery use even at high dynamic loads.
Optionally, the device can be kept in pulse width
modulation mode regardless of the load applied.
4
ORDERING INFORMATION
TYPE
NUMBER
PACKAGE
NAME
DESCRIPTION
VERSION
TEA1211HN
HVQFN32
plastic thermal enhanced very thin quad flat package; no leads;
32 terminals; body 5
5
0.85 mm
SOT617-3
2003 Oct 13
4
Philips Semiconductors
Preliminary specification
High efficiency auto-up/down
DC/DC converter
TEA1211HN
5
BLOCK DIAGRAM
handbook, full pagewidth
MDB001
I
2
C-BUS INTERFACE
TEMPERATURE
PROTECTION
INTERNAL
SUPPLY
BANDGAP
REFERENCE
13 MHz
OSCILLATOR
CLOCK
SELECTOR
DIGITAL
CONTROLLER
N-type
power FETs
N-down
TEA1211HN
LXB
LXA
n.c.
IN
2, 31, 32
29
6, 8, 17, 19
28
12
13
30
27
23, 25, 26
14, 15, 21, 22, 24
1, 3, 4,
10, 11
5, 7, 9, 16, 18, 20
SYNC/PWM
SHDWN
SCL
SDA
ILIM
GND
FB
OUT
Current limit
comparator
Window
comparator
P-type power FET
P-down
sense FET
P-type power FET
P-up
N-up
Fig.1 Block diagram.
6
PINNING
SYMBOL
PIN
DESCRIPTION
LXA
1
inductor connection 1
IN
2
input voltage
LXA
3
inductor connection 1
LXA
4
inductor connection 1
GND
5
ground
n.c.
6
not connected
GND
7
ground
n.c.
8
not connected
GND
9
ground
LXA
10
inductor connection 1
LXA
11
inductor connection 1
SCL
12
serial clock input line I
2
C-bus
SDA
13
serial data input/output line
I
2
C-bus
LXB
14
inductor connection 2
LXB
15
inductor connection 2
GND
16
ground
n.c.
17
not connected
GND
18
ground
n.c.
19
not connected
GND
20
ground
LXB
21
inductor connection 2
LXB
22
inductor connection 2
OUT
23
output voltage
LXB
24
inductor connection 2
OUT
25
output voltage
OUT
26
output voltage
FB
27
feedback input
SHDWN
28
shut-down input
SYNC/PWM
29
synchronization clock input,
PWM-only input
ILIM
30
current limit resistor connection
IN
31
input voltage
IN
32
input voltage
SYMBOL
PIN
DESCRIPTION
2003 Oct 13
5
Philips Semiconductors
Preliminary specification
High efficiency auto-up/down
DC/DC converter
TEA1211HN
handbook, halfpage
GND
SDA
LXA
SCL
LXA
LXB
GND
LXB
IN
SHDWN
ILIM
SYNC/PWM
IN
FB
OUT
OUT
n.c.
n.c.
GND
GND
LXA
LXA
IN
LXA
MDB002
GND
n.c.
GND
n.c.
LXB
LXB
OUT
LXB
2
1
3
4
5
6
7
16
14
12
15
13
11
10
9
25
28
26
27
29
30
31
32
8
24
23
21
22
20
19
18
17
TEA1211HN
Fig.2 Pin configuration.
This diagram is a bottom side view.
Pin 1 is indicated with a dot on the top side of the package.
For mechanical details of HVQFN32 package, see Chapter 12.
7
FUNCTIONAL DESCRIPTION
7.1
Introduction
The TEA1211HN is able to operate in Pulse Frequency
Modulation (PFM) or discontinuous conduction mode as
well as in Pulse Width Modulation (PWM) or continuous
conduction mode. All switching actions are completely
determined by a digital control circuit which uses the
output voltage level as control input. This digital approach
enables the use of a new pulse width and frequency
modulation scheme, which ensures optimum power
efficiency over the complete range of operation of the
converter.
7.2
Control mechanism
Depending on load current I
load
and V
IN
to V
OUT
ratio, the
controller chooses a mode of operation. When high output
power is requested, the device will operate in PWM
(continuous conduction) mode, which is a 2-phase cycle in
up- as well as in down mode. For small load currents the
controller will switch over to PFM (discontinuous mode),
which is either a 3- or 4-phase cycle depending on the
input to output ratio, see Fig.3.
handbook, halfpage
MDB003
0
PWM
Icoil
PFM
VIN
>
VOUT
down mode
VIN
=
VOUT
stationary mode
VIN
<
VOUT
up mode
Fig.3
Waveform of coil current as function of I
load
and V
IN
to V
OUT
ratio.
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