Philips Semiconductors
Preliminary specification
High efficiency auto-up/down
DC/DC converter
CONTENTS
1
2
3
4
5
6
7
7.1
7.2
7.2.1
7.2.2
7.2.3
7.3
7.4
7.5
7.6
7.7
7.8
7.9
7.10
7.11
7.12
7.12.1
7.12.2
7.12.3
7.12.4
7.13
7.13.1
7.13.2
7.13.3
FEATURES
APPLICATIONS
GENERAL DESCRIPTION
ORDERING INFORMATION
BLOCK DIAGRAM
PINNING
FUNCTIONAL DESCRIPTION
Introduction
Control mechanism
PWM
PFM
Switching sequence
Adjustable output voltage
Start-up
Under voltage lockout
Shut-down
Power switches
Synchronous rectification
PWM-only mode
External synchronisation
Current limiter
I
2
C-bus serial interface
Characteristics of the I
2
C-bus
START and STOP conditions
Bit transfer
Acknowledge
I
2
C-bus protocol
Addressing
Data
Write Cycle
8
9
10
11
11.1
11.2
11.2.1
11.2.2
11.2.3
11.2.4
11.2.5
12
13
13.1
13.2
13.3
13.4
13.5
14
15
16
17
LIMITING VALUES
TEA1211HN
THERMAL CHARACTERISTICS
CHARACTERISTICS
APPLICATION INFORMATION
Typical Li-Ion, 2- or 3-cell application with
I
2
C-bus programming
Component selection
Inductor
Capacitors
Schottky diodes
Feedback resistors
Current Limiter
PACKAGE OUTLINE
SOLDERING
Introduction to soldering surface mount
packages
Reflow soldering
Wave soldering
Manual soldering
Suitability of surface mount IC packages for
wave and reflow soldering methods
DATA SHEET STATUS
DEFINITIONS
DISCLAIMERS
PURCHASE OF PHILIPS I
2
C COMPONENTS
2003 Oct 13
2
Philips Semiconductors
Preliminary specification
High efficiency auto-up/down
DC/DC converter
1
FEATURES
TEA1211HN
•
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
µA
•
32-pin small body HVQFN package.
2
APPLICATIONS
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.
•
Stable output voltage from Lithium-Ion batteries
•
Variable voltage source for PAs (Power Amplifiers) in
cellular phones
•
Wireless handsets
•
Hand-held instruments
•
Portable computers.
4
ORDERING INFORMATION
TYPE
NUMBER
PACKAGE
NAME
HVQFN32
DESCRIPTION
plastic thermal enhanced very thin quad flat package; no leads;
32 terminals; body 5
×
5
×
0.85 mm
VERSION
SOT617-3
TEA1211HN
2003 Oct 13
3
Philips Semiconductors
Preliminary specification
High efficiency auto-up/down
DC/DC converter
TEA1211HN
9 GND
13 SDA
12 SCL
handbook, halfpage
n.c. 8
GND 7
n.c. 6
GND 5
LXA 4
LXA 3
IN 2
LXA 1
IN 31
ILIM 30
SHDWN 28
FB 27
OUT 26
SYNC/PWM 29
OUT 25
IN 32
16 GND
17 n.c.
18 GND
19 n.c.
20 GND
21 LXB
22 LXB
23 OUT
24 LXB
MDB002
10 LXA
11 LXA
14 LXB
TEA1211HN
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.
Fig.2 Pin configuration.
7
7.1
FUNCTIONAL DESCRIPTION
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
handbook, halfpage
Icoil
15 LXB
PWM
PFM
0
VIN
>
VOUT
down mode
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.
VIN
=
VOUT
stationary mode
VIN
<
VOUT
up mode
MDB003
Fig.3
Waveform of coil current as function of I
load
and V
IN
to V
OUT
ratio.
2003 Oct 13
5
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